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1

Basic surgical techniques in the Göttingen minipig: intubation, bladder catheterization, femoral vessel catheterization, and transcardial perfusion.  

PubMed

The emergence of the Göttingen minipig in research of topics such as neuroscience, toxicology, diabetes, obesity, and experimental surgery reflects the close resemblance of these animals to human anatomy and physiology (1-6).The size of the Göttingen minipig permits the use of surgical equipment and advanced imaging modalities similar to those used in humans (6-8). The aim of this instructional video is to increase the awareness on the value of minipigs in biomedical research, by demonstrating how to perform tracheal intubation, transurethral bladder catheterization, femoral artery and vein catheterization, as well as transcardial perfusion. Endotracheal Intubation should be performed whenever a minipig undergoes general anesthesia, because it maintains a patent airway, permits assisted ventilation and protects the airways from aspirates. Transurethral bladder catheterization can provide useful information about about hydration state as well as renal and cardiovascular function during long surgical procedures. Furthermore, urinary catheterization can prevent contamination of delicate medico-technical equipment and painful bladder extension which may harm the animal and unnecessarily influence the experiment due to increased vagal tone and altered physiological parameters. Arterial and venous catheterization is useful for obtaining repeated blood samples and monitoring various physiological parameters. Catheterization of femoral vessels is preferable to catheterization of the neck vessels for ease of access, when performing experiments involving frame-based stereotaxic neurosurgery and brain imaging. When performing vessel catheterization in survival studies, strict aseptic technique must be employed to avoid infections(6). Transcardial perfusion is the most effective fixation method, and yields preeminent results when preparing minipig organs for histology and histochemistry(2,9). For more information about anesthesia, surgery and experimental techniques in swine in general we refer to Swindle 2007. Supplementary information about premedication and induction of anesthesia, assisted ventilation, analgesia, pre- and postoperative care of Göttingen minipigs are available via the internet at http://www.minipigs.com(10). For extensive information about porcine anatomy we refer to Nickel et al. Vol. 1-5(11). PMID:21730947

Ettrup, Kaare S; Glud, Andreas N; Orlowski, Dariusz; Fitting, Lise M; Meier, Kaare; Soerensen, Jens Christian; Bjarkam, Carsten R; Alstrup, Aage K Olsen

2011-01-01

2

Urinary Catheterization of Male Rabbits: A New Technique and a Review of Urogenital Anatomy  

PubMed Central

Rabbits are widely used as an animal model for urologic research studies in which urinary bladder catheterization is required. However, standard manual retrograde urinary catheterization proved to be difficult to perform on anesthetized male rabbits in a research study, with frequent misplacement of the catheter into the vesicular gland. Attempts to reposition the catheter into the bladder after initial entry into the vesicular gland frequently failed and resulted in exclusion of the animal from the study. We assessed the normal anatomy of the lower urinary tract of male rabbits to determine the cause of catheterization misdirection into the vesicular gland and to develop a more reliable technique for urinary bladder catheterization. A modified ‘digital (finger) pressure’ catheterization technique was developed for successful urinary catheterization of male rabbits. Retrospective statistical analysis of 45 rabbits used for urinary catheterization studies showed improvement in the success rate of catheterization by using the digital pressure technique over the standard method of retrograde urinary catheter insertion. In addition, we here review the relevant gross and histologic anatomy of the urogenital tract of male rabbits. PMID:23562102

Uthamanthil, Rajesh K; Hachem, Ray Y; Gagea, Mihai; Reitzel, Ruth A; Borne, Agatha T; Tinkey, Peggy T

2013-01-01

3

A minimally invasive percutaneous technique for jugular vein catheterization in pigs.  

PubMed

The objective of this study was to develop a simple, safe, reproducible, and efficient technique that used readily available commercial materials for percutaneous catheterization of an external jugular vein in the pig. Guidewire-assisted vascular cannulation was introduced in the early 1950s and is often called the Seldinger technique, after its inventor. With few modifications, this technique has become widely used for all types of vascular cannulation in human and veterinary patients. The technique has the advantage of minimizing damage to soft tissues and blood vessels. We adapted this procedure by using five anatomical landmarks to target and catheterize the external jugular vein in pigs. Percutaneous catheterization of the external jugular vein can be accomplished easily in most pigs by using this technique. Novice technicians were able to quickly and easily learn the procedure. PMID:11860257

Fudge, Mack; Coleman, Randall E; Parker, Sheri B

2002-01-01

4

Rhinoplasty – indications and techniques  

PubMed Central

Rhinoplasty is considered to be one of the most challenging procedures in otolaryngology head and neck surgery. Meticulous planning and excellent surgical skills are pre-requisites for reproducible good outcomes. More than 100 years after the first rhinoplasty, many controversies regarding indication and techniques remain unresolved. The aim of this article is to review current concepts and arguments. PMID:22073085

Tasman, Abel-Jan

2008-01-01

5

A New Coronary Retroinfusion Technique in theRat Infarct Model: Transjugular Cardiac Vein Catheterization  

PubMed Central

Cell delivery via the retrograde coronary route boasts less vessel embolism, myocardial injury, and arrhythmogenicity when compared with those via antegrade coronary administration or myocardial injection. However, conventional insertion into the coronary sinus and consequent bleeding complication prevent its application in small animals. To overcome the complication of bleeding, we described a modified coronary retroinfusion technique via the jugular vein route in rats with myocardial infarction (MI). A flexible wire with a bent end was inserted into the left internal jugular vein and advanced slowly along the left superior vena cava. Under direct vision, the wire was run into the left cardiac vein by rotating the wire and changing the position of its tip. A fine tube was then advanced along the wire to the left cardiac vein. This modified technique showed less lethal hemorrhage than the conventional technique. Retroinfusion via transjugular catheter enabled efficient fluid or cell dissemination to the majority areas of the free wall of the left ventricle, covering the infarcted anterior wall. In conclusion, transjugular cardiac vein catheterization may make retrocoronary infusion a more safe and practical route for delivering cell, drug, and gene therapy into the infarcted myocardium of rats. PMID:23903054

Huang, Zheyong; Shen, Yunli; Zhu, Hongmin; Xu, Jianfeng; Song, Yanan; Hu, Xinying; Shuning, Zhang; Yang, Xiangdong; Sun, Aijun; Qian, Juying; Ge, Junbo

2013-01-01

6

Percutaneous Transhepatic Catheterization of the Portal Vein: A Combined CT- and Fluoroscopy-Guided Technique  

SciTech Connect

Combined CT- and fluoroscopy-guided transhepatic portal vein catheterization was performed in 44 patients selected for pancreatic islet cell transplantation. The method allowed catheterization with a single puncture attempt in 39 patients. In four patients two attempts and in one patient four attempts were necessary. One minor hematoma of the liver capsule occurred that required no further treatment. Compared with other methods the average number of puncture attempts was reduced.

Weimar, Bernd; Rauber, Klaus [Department of Diagnostic Radiology, Justus Liebig University of Giessen, Klinikstrasse 29, D-35392 Giessen (Germany); Brendel, Mathias D.; Bretzel, Reinhard G. [Department of Medicine, Medizinische Klinik III, Justus Liebig University of Giessen, Rodthohl 6, D-35392 Giessen (Germany); Rau, Wigbert S. [Department of Diagnostic Radiology, Justus Liebig University of Giessen, Klinikstrasse 29, D-35392 Giessen (Germany)

1999-07-15

7

Complications following cava catheterization.  

PubMed

The employment of cava catheterization in intensive care and emergency-treatment has dramatically increased. On the basis of our patients in the Surgical Clinics of the RWTH Aachen risks and complications of the central venous catheterization are explained. Six hundred and eighty-four cases have been examined--categorized according to the method of insertion and according to the technique. In a small randomized study, 60 cava catheters were individually examined bacteriologically. PMID:899567

Raguse, T; Lynen, F K; Schröder, W

1977-01-01

8

Cardiac Catheterization  

MedlinePLUS

... done during a cardiac catheterization include: closing small holes inside the heart repairing leaky or narrow heart ... bandage. It's normal for the site to be black and blue, red, or slightly swollen for a ...

9

Urinary Catheterization  

MedlinePLUS

... hospital bed (near the floor). This position allows gravity to help the urine drain. An indwelling catheter ... are reusable, while others are disposable, single-use models. People who do CIC catheterization on themselves will ...

10

Urine culture - catheterized specimen  

MedlinePLUS

Culture - urine - catheterized specimen; Urine culture - catheterization; Catheterized urine specimen culture ... urinary tract infections may be found in the culture. This is called a contaminant. You may not ...

11

Endoscopic transcervical catheterization in the domestic cat.  

PubMed

Feline-assisted reproduction is still not routinely performed in veterinary practice, although there is an increasing interest on the subject by cat breeders. In recent years, many techniques for artificial insemination in the domestic cat have been developed with regard to the intrauterine deposition of sperm through the catheterization of the cervix. Transcervical catheterization has been described also for diagnostic and therapeutic purposes. This article provides the first description of a new method for cervical catheterization, under the direct visualization of the cervix, using a rigid endoscope and a new specially designed transcervical catheter. The procedure was performed on 14 queens with a success rate of 85.71%. PMID:25358819

Zambelli, D; Bini, C; Cunto, M

2015-02-01

12

Validation of Noninvasive Indices Of Global Systolic Function in Patients with Normal and Abnormal Loading Conditions: A Simultaneous Echocardiography Pressure-Volume Catheterization Study  

PubMed Central

Background Noninvasive indices based on Doppler-echocardiography are increasingly used in clinical cardiovascular research to evaluate LV global systolic chamber function. Our objectives were 1) to clinically validate ultrasound-based methods of global systolic chamber function to account for differences between patients in conditions of abnormal load, and 2) to assess their sensitivity to load confounders. Methods and Results Twenty-seven patients (8 dilated cardiomyopathy, 10 normal ejection fraction [EF], and 9 end-stage liver disease) underwent simultaneous echocardiography and left heart catheterization with pressure-conductance instrumentation. The reference index, maximal elastance (Emax) was calculated from pressure-volume loop data obtained during acute inferior vena cava occlusion. A wide range of values was observed for LV systolic chamber function (Emax: 2.8 ± 1.0 mmHg/ml), preload, and afterload. Amongst the noninvasive indices tested, the peak ejection intraventricular pressure difference (peak-EIVPD) showed the best correlation with Emax (R=0.75). A significant but weaker correlation with Emax was observed for EF (R=0.41), mid-wall fractional shortening (R=0.51), global circumferential strain(R=?0.53), and strain-rate (R=?0.46). Longitudinal strain and strain-rate failed to correlate with Emax, as did noninvasive single-beat estimations of this index. Principal component and multiple regression analyses demonstrated that peak-EIVPD was less sensitive to load, whereas EF and longitudinal strain and strain-rate were heavily influenced by afterload. Conclusions Current ultrasound methods have limited accuracy to characterize global LV systolic chamber function in a given patient. The Doppler-derived peak-EIVPD should be preferred for this purpose because it best correlates with the reference index and is more robust in conditions of abnormal load. PMID:24173273

Yotti, Raquel; Bermejo, Javier; Benito, Yolanda; Sanz, Ricardo; Ripoll, Cristina; Martínez-Legazpi, Pablo; Péerez del Villar, Candela; Elízaga, Jaime; González-Mansilla, Ana; Barrio, Alicia; Bañares, Rafael; Fernández-Avilés, Francisco

2014-01-01

13

Fallopian Tube Catheterization  

PubMed Central

Fallopian tube catheterization is used for treatment of infertility caused by proximal tubal occlusion, and has replaced surgical treatment for this condition. More recently, fallopian tube catheterization has been used for tubal sterilization. Interventional radiologists tested numerous methods for tubal occlusion using the rabbit as an animal model. As a result, a tubal device has recently been Food and Drug Administration approved for permanent sterilization using hysteroscopic guidance; it can also be placed fluoroscopically by fallopian tube catheterization as an “off-label” procedure. This is a 5-year continuation and update on a procedure that has been done by interventional radiologists for 25 years; history of the development of fallopian tube catheterization in women has been published in detail in this journal. Highlighted in this article will be description of the basic components needed for fallopian tube catheterization. PMID:24436565

Thurmond, Amy Suzanne

2013-01-01

14

A century of indicator dilution technique.  

PubMed

This review imparts the history and the present status of the indicator dilution technique with quantitative bolus injection. The first report on flow measurement with this technique appeared 100 years ago. In 1928, the use of intravascular dyes made possible a widespread application in animals and human during the next decades. Multiple indicators, radioactive tracers, inlet-outlet detection and residue detection were introduced in the 1950s and 1960s, and refined along with the development of indicator kinetics. From the 1970s, a wide clinical use in the study of heart, brain, lungs, liver and kidneys developed, and powerful computers in the 1980s and 1990s accorded the technique a new dimension. Today, the indicator dilution technique, on one hand, is applied in the same way as 100 years ago, on the other hand it forms the basis of quantitative SPECT, positron emission tomography, and dynamic MR scans. The technique still undergoes refinement and elaboration as a lasting concept with a high potential for further development. PMID:23869947

Henriksen, Jens H; Jensen, Gorm B; Larsson, Henrik B W

2014-01-01

15

Multicenter long-term validation of a minicourse in radiation-reducing techniques in the catheterization laboratory.  

PubMed

Patient radiation exposure in invasive cardiology is considerable. We aimed to investigate, in a multicenter field study, the long-term efficacy of an educational 90-minute workshop in cardiac invasive techniques with reduced irradiation. Before and at a median period of 2.5 months and 2.0 years after the minicourse (periods I, II, and III, respectively) at 5 German cardiac centers, 18 interventionalists documented various radiation parameters for 10 coronary angiographies. The median patient dose area product (DAP) for periods I, II, and III amounted to 26.6, 12.2, and 9.6 Gy × cm(2), respectively. The short-term and long-term effects were related to shorter median fluoroscopy times (180, 138, and 114 seconds), fewer radiographic frames (745, 553, and 417) because of fewer (11, 11, and 10) and shorter (64, 52, and 44 frames/run) runs, consistent collimation, and restriction to an adequate image quality; both radiographic DAP/frame (27.7, 17.3, and 18.4 mGy × cm(2)) and fluoroscopic DAP/second (26.6, 12.9, and 14.9 mGy × cm(2)) decreased significantly. Multivariate analysis over time indicated increasing efficacy of the minicourse itself (-55% and -64%) and minor influence of interventionist experience (-4% and -3% per 1,000 coronary angiographies, performed lifelong until the minicourse and until period III). In conclusion, autonomous self-surveillance of various dose parameters and feedback on individual radiation safety efforts supported the efficacy of a 90-minute course program toward long-lasting and ongoing patient dose reduction. PMID:25579886

Kuon, Eberhard; Weitmann, Kerstin; Hoffmann, Wolfgang; Dörr, Marcus; Hummel, Astrid; Riad, Alexander; Busch, Mathias C; Felix, Stephan B; Empen, Klaus

2015-02-01

16

Finger replantation: surgical technique and indications.  

PubMed

In this article, we discuss the surgical technique of finger replantation in detail, distinguishing particularities of technique in cases of thumb amputation, children fingertip replantation, ring finger avulsion, and very distal replantations. We emphasize the principles of bone shortening, the spare part concept, the special importance of nerve sutures and the use of vein graft in case of avulsion or crushing. However, even if finger replantation is now a routine procedure, a clear distinction should be made between revascularization and functional success. The indications for finger replantation are then detailed in the second part of this paper. The absolute indications for replantation are thumb, multiple fingers, transmetacarpal or hand, and any upper extremity amputation in a child whatever the level. Fingertip amputations distal to the insertion of the Flexor digitorum superficialis (FDS) are also a good indication. Other cases are more controversial because of the poor functional outcome, especially for the index finger, which is often functionally excluded. PMID:24075814

Barbary, S; Dap, F; Dautel, G

2013-12-01

17

MR intervention: indications, technique, correlation and histologic.  

PubMed

Although breast magnetic resonance (MR) imaging was initially hindered by the limited availability of coils, protocols, and particularly breast biopsy devices, standardized imaging and specialized equipment necessary to perform high-quality MR imaging of the breast is now readily available. Those performing breast MR imaging should also be capable of performing biopsies, or at least have a close association with a facility that does. Optimal management of patients requires a good understanding of the indications and technique of breast MR imaging biopsies. In this article the indications for breast MR interventional procedures along with the techniques used are described. In addition, the histologic process encountered and recommended strategies for patient management are discussed. PMID:20494315

Philpotts, Liane E

2010-05-01

18

Cardiac catheterization is underutilized after in-hospital cardiac arrest  

PubMed Central

Background Indications for immediate cardiac catheterization in cardiac arrest survivors without ST elevation myocardial infarction (STEMI) are uncertain as electrocardiographic and clinical criteria may be challenging to interpret in this population. We sought to evaluate rates of early catheterization after in-hospital ventricular fibrillation (VF) arrest and the association with survival. Methods Using a billing database we retrospectively identified cases with an ICD-9 code of cardiac arrest (427.5) or VF (427.41). Discharge summaries were reviewed to identify in-hospital VF arrests. Rates of catheterization on the day of arrest were determined by identifying billing charges. Unadjusted analyses were performed using chi square, and adjusted analyses were performed using logistic regression. Results 110 in-hospital VF arrest survivors were included in the analysis. Cardiac catheterization was performed immediately or within one day of arrest in 27% (30/110) of patients and of these patients, 57% (17/30) successfully received percutaneous coronary intervention. Of those who received cardiac catheterization the indication for the procedure was STEMI or new left bundle branch block (LBBB) in 43% (13/30). Therefore, in the absence of standard ECG data suggesting acute myocardial infarction, 57% (17/30) received angiography. Patients receiving cardiac catheterization were more likely to survive than those who did not receive catheterization (80% vs. 54%, p<.05). Conclusion In patients receiving cardiac catheterization, more than half received this procedure for indications other than STEMI or new LBBB. Cardiac catheterization was associated with improved survival. Future recommendations need to be established to guide clinicians on which arrest survivors might benefit from immediate catheterization. PMID:18951683

Merchant, Raina M.; Abella, Benjamin S.; Khan, Monica; Huang, Kuang-Ning; Beiser, David B.; Neumar, Robert W.; Carr, Brendan G.; Becker, Lance B.; Vanden Hoek, Terry L.

2009-01-01

19

Indications, stains and techniques in chromoendoscopy  

PubMed Central

Early detection of malignancies within the gastrointestinal tract is essential to improve the prognosis and outcome of affected patients. However, conventional white light endoscopy has a miss rate of up to 25% for gastrointestinal pathology, specifically in the context of small and flat lesions within the colon. Chromoendoscopy and other advanced imaging techniques aim at facilitating the visualization and detection of neoplastic lesions and have been applied throughout the gastrointestinal tract. Chromoendoscopy, particularly in combination with magnifying endoscopy has significantly improved means to detect neoplastic lesions in the gastrointestinal mucosa, particularly in ulcerative colitis and Crohn’s colitis. In addition, chromoendoscopy is beneficial in the upper gastrointestinal tract, especially when evaluating Barrett’s oesophagus (BO) for the presence of dysplasia. Furthermore, it also improves characterization, differentiation and diagnosis of endoscopically detected suspicious lesions, and helps to delineate the extent of neoplastic lesions that may be amenable to endoscopic resection. This review discusses the dyes, indications and advanced endoscopic imaging methods used in various chromoendoscopic techniques, and presents a critical overview of the existing evidence supporting their use in current practice with a particular emphasis on the role in inflammatory bowel disease and BO. PMID:23097386

Trivedi, P.J.

2013-01-01

20

Hip Microfracture: Indications, Technique, and Outcomes  

Microsoft Academic Search

Microfracture is a marrow-stimulating technique used in the hip to treat cartilage defects associated with femoroacetabular impingement, instability, or traumatic hip injury. These defects have a low probability of healing spontaneously and therefore often require surgical intervention. Originally adapted from the knee, microfracture is part of a spectrum of cartilage repair options that include palliative procedures such as debridement and

Kevin C. McGill; Charles A. Bush-Joseph; Shane J. Nho

2010-01-01

21

Surgical sperm retrieval: Techniques and their indications  

PubMed Central

Men with azoospermia can father a child through intra-cytoplasmic sperm injection if sperm can be retrieved from their epididymis or testis. Several percutaneous and open surgical procedures have been described to retrieve sperm. The various techniques and their merits are discussed in this review. In men with obstructive azoospermia, epididymal sperm can usually be retrieved by percutaneous epididymal sperm aspiration (PESA). If PESA fails then testicular sperm are obtained by needle aspiration biopsy (NAB). In men with non-obstructive azoospermia, there will be no sperm in the epididymis and testicular sperm retrieval is required. Percutaneous retrieval by NAB can be tried first. If that fails then testicular sperm extraction (TESE) from open microsurgical biopsies is performed using the single seminiferous tubule (SST) or the microdissection TESE techniques. The simplest, least invasive procedure should be tried first. PMID:21716933

Shah, Rupin

2011-01-01

22

Reoperative coronary grafting: changing patient profiles, operative indications, techniques, and results.  

PubMed

To assess the changing trends in patient profiles, operative indications and techniques, and their impact on the results of reoperative myocardial revascularization, we reviewed the records of 750 consecutive patients who had an isolated first reoperation for coronary artery disease at the Massachusetts General Hospital from 1977 to 1992. The patients were chronologically grouped into three equal cohorts of 250 patients. Our assessment over time revealed a significantly (p < 0.03) increased incidence of the following: older age, peripheral vascular disease, grafts at the first revascularization, longer operative interval, interval infarctions and angioplasties, and congestive heart failure and unstable angina requiring greater use of preoperative intraaortic balloon pumping. At catheterization significantly more left main coronary disease, lower ejection fractions, and more patent but diseased grafts were found. The reoperations were significantly done more urgently, with more grafts placed and a greater use of mammary artery grafting. Despite these increased risks over time, median postoperative hospital stay was significantly shortened (p < 0.001), though hospital mortality (5.3%) and perioperative myocardial infarction (6.3%) did not change significantly. Significant multivariate predictors of hospital death were nonelective operation, perioperative myocardial infarction, prior myocardial infarction, and mammary artery grafting at the initial operation. PMID:8067832

Akins, C W; Buckley, M J; Daggett, W M; Hilgenberg, A D; Vlahakes, G J; Torchiana, D F; Austen, W G

1994-08-01

23

Progression of renal artery stenosis in patients undergoing cardiac catheterization  

Microsoft Academic Search

Background Renal artery stenosis is potentially correctable by either revascularization surgery or percutaneous methods. However, appropriate use of these techniques has been hampered by a lack of data on the natural history of this disease. This study assesses the prevalence, risk factors for progression, and effect on renal function of angiographically demonstrated renal artery disease in patients undergoing cardiac catheterization.

James J. Crowley; Renato M. Santos; Robert H. Peter; Joseph A. Puma; Steve J. Schwab; Harry R. Phillips; Richard S. Stack; Peter J. Conlon

1998-01-01

24

A practical approach to difficult urinary catheterizations.  

PubMed

Routine placement of transurethral catheters can be challenging in some situations, such as urethral strictures, severe phimosis and false passages. Intravaginal retraction of the urethral meatus can complicate Foley placement in postmenopausal females. In men, blind urethral procedures with mechanical or metal sounds without visual guidance or guidewire assistance are now discouraged due to the increased risk of urethral trauma and false passages. Newer techniques of urethral catheterization including guidewires, directed hydrophilic mechanical dilators, urethral balloon dilation, and direct vision endoscopic catheter systems are discussed, along with the new standardized protocol for difficult transurethral catheter insertions. Suprapubic catheter placement techniques, including percutaneous trocars and the use of the curved Lowsley tractor for initial suprapubic catheter insertion, are reviewed. Prevention and management of common catheter-related problems such as encrustation, leakage, Foley malposition, balloon cuffing and frequent blockages are discussed. PMID:23959835

Ghaffary, Cameron; Yohannes, Amanuel; Villanueva, Carlos; Leslie, Stephen W

2013-12-01

25

Retrograde recanalization of complex SFA lesions indications and techniques.  

PubMed

Femoro-popliteal segment is often characterized by diffuse and severe steno-obstructive atheroclerotic disease. Most recent guidelines recommended endovascular techniques as a valid and safe treatment in highly symptomatic patients (Rutherford class 4 to 6) with complex femoropopliteal lesions (TASC C and D). Continuous technical development is increasing the efficacy of the endovascular technique with the introduction of new dedicated devices. In most complex situation also retrograde recanalization can be applied. The main indication to this technique is when conventional antegrade recanalisation fails or cannot be apply. The most common retrograde access is through the popliteal artery. However many operators do not like this approach due to the technical issue correlated to the patient position. Recently several reports have been published keeping the patient supine improving patient comfort and operator activity. This tehnique was also affected by several complications at the level of the popliteal puncture site, but those were resolved with the improvement of technique and operator skills. Hence several Authors described different variants of such technique (subintimal techniques, patient in supine position, puncture of the distal superficial femoral artery, tibial/pedal artery access) all obtaining an high rate of success with a low complication rate. In conclusion retrograde recanalization can be considered a safe and effective technique for complex femoral lesions. It is also less expensive than recanalisation devices, less time consuming and can increase the outcome due to the higher percentage of intraluminal recanalization. PMID:24918195

Fanelli, F; Cannavale, A

2014-08-01

26

Deep Anterior Lamellar Keratoplasty: Indications, Surgical Techniques and Complications  

PubMed Central

The concept of lamellar keratoplasty (LK) is not new. However, it had been abandoned and largely replaced by the time-honored technique of penetrating keratoplasty (PK) because LK is technically demanding, time consuming and gives suboptimal visual outcomes due to interface irregularity arising from manual lamellar dissection. Recent improvements in surgical instruments and introduction of new techniques of maximum depth of corneal dissection as well as inherent advantages such as preservation of globe integrity and elimination of endothelial graft rejection have resulted in a re-introduction of LK as an acceptable alternative to conventional PK. This review article describes the indications, different techniques, clinical outcomes and complications of deep anterior LK. PMID:20543934

Karimian, Farid; Feizi, Sepehr

2010-01-01

27

Repeated Transradial Catheterization: Feasibility, Efficacy, and Safety  

PubMed Central

Transradial access is an alternative to the transfemoral approach in coronary interventions. It results in less access-site bleeding, shorter hospital stays, lower costs, and less pain for the patient. However, some authors have suggested that the transradial approach might lead to radial artery occlusion, which precludes repeated same-artery catheterizations. Using data from our center, we evaluated the feasibility, safety, and efficacy of repeated transradial catheterization. We reviewed the 3,006 transradial catheterizations performed at our center from 2006 through 2009. Patients who had undergone at least one repeated transradial catheterization were identified, their cases monitored through 2012, and their baseline characteristics and other factors, including procedural sequelae, were analyzed. Seventy-nine patients underwent repeated right radial artery catheterizations, for a total of 92 repeated procedures. Repeated access to the right radial artery was not achieved in 4 attempts (failure rate, 4.3%), because of poor pulses or the operator's inability to advance the wire. No major sequelae were noted. The average times between the 1st to 2nd, 2nd to 3rd, and 3rd to 4th catheterizations were 406, 595, and 401 days, respectively. Our procedural success rate of 95.7% in performing repeated transradial catheterizations with no major sequelae provides support for the efficacy and safety of such procedures. PMID:25593518

Constantinides, Savvas S.; Talias, Michael A.; Soteriades, Elpidoforos S.; Christou, Christos P.

2014-01-01

28

Repeated transradial catheterization: feasibility, efficacy, and safety.  

PubMed

Transradial access is an alternative to the transfemoral approach in coronary interventions. It results in less access-site bleeding, shorter hospital stays, lower costs, and less pain for the patient. However, some authors have suggested that the transradial approach might lead to radial artery occlusion, which precludes repeated same-artery catheterizations. Using data from our center, we evaluated the feasibility, safety, and efficacy of repeated transradial catheterization. We reviewed the 3,006 transradial catheterizations performed at our center from 2006 through 2009. Patients who had undergone at least one repeated transradial catheterization were identified, their cases monitored through 2012, and their baseline characteristics and other factors, including procedural sequelae, were analyzed. Seventy-nine patients underwent repeated right radial artery catheterizations, for a total of 92 repeated procedures. Repeated access to the right radial artery was not achieved in 4 attempts (failure rate, 4.3%), because of poor pulses or the operator's inability to advance the wire. No major sequelae were noted. The average times between the 1st to 2nd, 2nd to 3rd, and 3rd to 4th catheterizations were 406, 595, and 401 days, respectively. Our procedural success rate of 95.7% in performing repeated transradial catheterizations with no major sequelae provides support for the efficacy and safety of such procedures. PMID:25593518

Charalambous, Marinos A; Constantinides, Savvas S; Talias, Michael A; Soteriades, Elpidoforos S; Christou, Christos P

2014-12-01

29

Propeller Flaps: A Review of Indications, Technique, and Results  

PubMed Central

In the last years, propeller flaps have become an appealing option for coverage of a large range of defects. Besides having a more reliable vascular pedicle than traditional flap, propeller flaps allow for great freedom in design and for wide mobilization that extend the possibility of reconstructing difficult wounds with local tissues and minimal donor-site morbidity. They also allow one-stage reconstruction of defects that usually require multiple procedures. Harvesting of a propeller flap requires accurate patient selection, preoperative planning, and dissection technique. Complication rate can be kept low, provided that potential problems are prevented, promptly recognized, and adequately treated. This paper reviews current knowledge on propeller flaps. Definition, classification, and indications in the different body regions are discussed based on a review of the literature and on the authors' experience. Details about surgical technique are provided, together with tips to avoid and manage complications. PMID:24971367

D'Arpa, Salvatore; Toia, Francesca; Pirrello, Roberto; Moschella, Francesco; Cordova, Adriana

2014-01-01

30

[Arthroscopy of the shoulder joint. Technique, indications, surgery and complications].  

PubMed

Diagnostic and operative arthroscopy of the shoulder joint has gained considerable importance in traumatology and orthopedic surgery over the last years. Injuries of the limbus glenoidalis, in particular traumatic shoulder luxation, injuries of the rotator cuff, infection of the glenohumeral joint and unclear posttraumatic pain are indications for diagnostic and operative arthroscopy. Arthroscopy of the shoulder is a procedure, which offers exact diagnosis and the possibility of immediate surgery at the same time. The technique of the shoulder joint arthroscopy has to be carried out carefully and according to a standard protocol. The complication rate of around 5% of shoulder arthroscopy has not to be neglected. PMID:8366732

Brülhart, K B; Roggo, A; Kossmann, T; Duff, C; Schimmer, R; Glinz, W

1993-01-01

31

Continuous use of intermittent bladder catheterization - can social support contribute?  

PubMed Central

Objective to investigate the factors affecting the adequate continuous use of intermittent catheterization and its relation with social support. Method sectional, descriptive and correlational study involving 49 patients with neuropathic bladder caused by spinal cord injury. Results almost all (92%) participants continued the intermittent catheterization, but 46.9% made some changes in the technique. The complications (28.6% of the sample) were mainly infection and vesicolithiasis. There were high scores for social support in relation to people that were part of the patient's social support. Conclusion All of them noticed great support from the family, but not from the society in general. The difficulties were related to the lack of equipment and inadequate infrastructure, leading to changes that increased urologic complications. PMID:25029058

Lopes, Marjoyre Anne Lindozo; Lima, Elenice Dias Ribeiro de Paula

2014-01-01

32

Percutaneous endoscopic gastrostomy: Indications, technique, complications and management  

PubMed Central

Percutaneous endoscopic gastrostomy (PEG) is the preferred route of feeding and nutritional support in patients with a functional gastrointestinal system who require long-term enteral nutrition. Besides its well-known advantages over parenteral nutrition, PEG offers superior access to the gastrointestinal system over surgical methods. Considering that nowadays PEG tube placement is one of the most common endoscopic procedures performed worldwide, knowing its indications and contraindications is of paramount importance in current medicine. PEG tubes are sometimes placed inappropriately in patients unable to tolerate adequate oral intake because of incorrect and unrealistic understanding of their indications and what they can accomplish. Broadly, the two main indications of PEG tube placement are enteral feeding and stomach decompression. On the other hand, distal enteral obstruction, severe uncorrectable coagulopathy and hemodynamic instability constitute the main absolute contraindications for PEG tube placement in hospitalized patients. Although generally considered to be a safe procedure, there is the potential for both minor and major complications. Awareness of these potential complications, as well as understanding routine aftercare of the catheter, can improve the quality of care for patients with a PEG tube. These complications can generally be classified into three major categories: endoscopic technical difficulties, PEG procedure-related complications and late complications associated with PEG tube use and wound care. In this review we describe a variety of minor and major tube-related complications as well as strategies for their management and avoidance. Different methods of percutaneous PEG tube placement into the stomach have been described in the literature with the “pull” technique being the most common method. In the last section of this review, the reader is presented with a brief discussion of these procedures, techniques and related issues. Despite the mentioned PEG tube placement complications, this procedure has gained worldwide popularity as a safe enteral access for nutrition in patients with a functional gastrointestinal system. PMID:24976711

Rahnemai-Azar, Ata A; Rahnemaiazar, Amir A; Naghshizadian, Rozhin; Kurtz, Amparo; Farkas, Daniel T

2014-01-01

33

Percutaneous endoscopic gastrostomy: indications, technique, complications and management.  

PubMed

Percutaneous endoscopic gastrostomy (PEG) is the preferred route of feeding and nutritional support in patients with a functional gastrointestinal system who require long-term enteral nutrition. Besides its well-known advantages over parenteral nutrition, PEG offers superior access to the gastrointestinal system over surgical methods. Considering that nowadays PEG tube placement is one of the most common endoscopic procedures performed worldwide, knowing its indications and contraindications is of paramount importance in current medicine. PEG tubes are sometimes placed inappropriately in patients unable to tolerate adequate oral intake because of incorrect and unrealistic understanding of their indications and what they can accomplish. Broadly, the two main indications of PEG tube placement are enteral feeding and stomach decompression. On the other hand, distal enteral obstruction, severe uncorrectable coagulopathy and hemodynamic instability constitute the main absolute contraindications for PEG tube placement in hospitalized patients. Although generally considered to be a safe procedure, there is the potential for both minor and major complications. Awareness of these potential complications, as well as understanding routine aftercare of the catheter, can improve the quality of care for patients with a PEG tube. These complications can generally be classified into three major categories: endoscopic technical difficulties, PEG procedure-related complications and late complications associated with PEG tube use and wound care. In this review we describe a variety of minor and major tube-related complications as well as strategies for their management and avoidance. Different methods of percutaneous PEG tube placement into the stomach have been described in the literature with the "pull" technique being the most common method. In the last section of this review, the reader is presented with a brief discussion of these procedures, techniques and related issues. Despite the mentioned PEG tube placement complications, this procedure has gained worldwide popularity as a safe enteral access for nutrition in patients with a functional gastrointestinal system. PMID:24976711

Rahnemai-Azar, Ata A; Rahnemaiazar, Amir A; Naghshizadian, Rozhin; Kurtz, Amparo; Farkas, Daniel T

2014-06-28

34

Per-oral endoscopic myotomy: Emerging indications and evolving techniques.  

PubMed

Esophageal achalasia is a benign esophageal motility disorder resulting from an impaired relaxation of the lower esophageal sphincter. The principles of treatment involve disruption of the sphincter at the esophagogastric junction. Treatment techniques include balloon dilatation, botulinum toxin injection, and surgical myotomy. In 2008, per-oral endoscopic myotomy (POEM) was introduced by Inoue et?al. as an endoscopic myotomy with no skin incision. The procedure has been well accepted and widely applied owing to its minimal invasiveness and high cure rates. Moreover, there have been discussions on wider indications for POEM and new technical developments have been reported. The present article reviews the historical background and present status of POEM, as well as future prospects for its application in the treatment of esophageal achalasia. PMID:25040806

Minami, Hitomi; Inoue, Haruhiro; Haji, Amyn; Isomoto, Hajime; Urabe, Shigetoshi; Hashiguchi, Keiichi; Matsushima, Kayoko; Akazawa, Yuko; Yamaguchi, Naoyuki; Ohnita, Ken; Takeshima, Fuminao; Nakao, Kazuhiko

2015-01-01

35

Clinical significance of retinal emboli during diagnostic and therapeutic cardiac catheterization in patients with coronary artery disease  

PubMed Central

Background Cardiac catheterization may cause retinal embolization, a risk factor for cerebrovascular emboli and stroke. We describe the incidence of clinically silent and apparent retinal emboli following diagnostic and interventional coronary catheterization and associated risk factors. Methods Three hundred selected patients attending a tertiary referral center for diagnostic and therapeutic cardiac catheterization were studied. Retinal examination and examination of the visual field and acuity were done before and after catheterization by a retinal specialist. Results There were 5 case of retinal embolus before catheterization, and 19 patients (incidence 6.3%) developed new retinal arteriolar emboli after catheterization. Only 1 patient developed clinically apparent changes in vision. Two conventional risk factors (age and hypertension) were significantly associated with new retinal emboli. The risk of retinal emboli was also significantly associated with operator expertise. Conclusions Retinal embolism was found after coronary catheterization in 6.3% of our patients. This finding indicates that the retinal, and possibly the cerebral circulation, may be compromised more frequently than is clinically apparent as a complication of coronary catheterization. Age and hypertension are independent predictors of retinal embolism. Trial Registration NCT01157338 PMID:21255443

2011-01-01

36

[External patello-tibial transfixation. I: Indications and technique].  

PubMed

Patello-tibial transfixation using the MPT-fixator is a new kind of external fixation. The device works biomechanically transferring the quadriceps tension forces from the patella to the lower leg and converting them into extension of the knee. The fixator can be applied in two different configurations. When performing configuration A, a Steinmann pin with a central thread is transversely placed through the patella and proximal tibia. Both pins are joined to connecting rods. Configuration B differs from type A in that a Schanz screw is inserted from anterior to posterior through the proximal tibia. The frame construction is achieved by fastening the tibial-sided Steinmann pin with a special clamp at the Schanz screw. Patello-tibial transfixation is indicated in the repair of fresh extensor mechanism disruption and reconstruction of neglected rupture of the patellar tendon. The technique provides a secure protection of the repair and reconstruction against mechanical overloading during the healing period. It enables immediate functional after-treatment and mobilization with early full weight bearing. PMID:9132951

Gotzen, L; Ishaque, B; Morgenthal, F; Petermann, J

1997-01-01

37

Right- and left-sided heart catheterization as a quality marker for catheterization laboratories (from the national Veterans Affairs clinical assessment reporting and tracking program).  

PubMed

The rate of concurrent right-heart catheterization (RHC) in patients undergoing left-heart catheterization (LHC) for coronary artery disease (CAD) indications or bilateral heart catheterization (BHC) is recommended as a measure of hospital quality, with higher rates suggesting over utilization. Our aim was to describe the prevalence of BHC and abnormal RHC findings in patients undergoing BHC with a primary indication for LHC. A retrospective analysis was performed for patients undergoing cardiac catheterization for CAD indications using the Department of Veterans Affairs Clinical Assessment Reporting and Tracking Program. Patients undergoing catheterization from October 2007 to September 2011 in 76 Veterans Affairs hospitals were included. Among 95,656 patients undergoing catheterization for CAD, 6,611 (6.9%) underwent BHC and 88,929 (93.0%) LHC. Among the patients undergoing BHC, 61.3% had at least 1 of the following abnormal RHC values: mean pulmonary artery (PA) pressure >25 mm Hg, pulmonary capillary wedge pressure (PCWP) >15 mm Hg, or pulmonary vascular resistance (PVR) >3 Woods units. A total of 37.5% of patients had mean PA pressures of 26 to 40 mm Hg and 11.1% had mean PA pressures >40 mm Hg. A total of 34.4% of patients had mean PCWP of 16 to 25 mm Hg and 13.6% had mean PAWP >25 mm Hg. A total of 16.5% of patients had PVR between 3 and 6 WU and 2.9% had PVR >6 WU. A total of 4.3% of patients met formal criteria for pulmonary arterial hypertension (defined as the combination of PA mean >25 mm Hg, PCWP ?15 mm Hg, and PVR >3). In conclusion, these findings suggest that most BHC were performed for appropriate clinical reasons. Future studies should further explore BHC rate as an effective quality indicator. PMID:25316348

Yeo, Khung Keong; Maddox, Thomas M; Carey, Evan; Low, Reginald I; Shunk, Kendrick A

2014-12-01

38

Ultrasound Guidance for Radial Artery Catheterization: An Updated Meta-Analysis of Randomized Controlled Trials  

PubMed Central

Background Since a previous meta-analysis reported that ultrasound guidance was associated with a higher first-attempt success rate in catheterization of the radial artery, a number of randomized controlled trials (RCTs) have reported inconsistent results. The aim of the present study is to conduct an updated meta-analysis to clarify the role of ultrasound guidance for radial artery catheterization. Methods A systematic literature search of PubMed, Embase, and Cochrane Central Register of Controlled Trials was conducted using specific search terms. Eligible studies were RCTs that compared ultrasound guidance with traditional palpation for radial artery catheterization. The Mantel-Haenszel method using the random effects model was adopted in this meta-analysis. Results Seven RCTs with 482 patients were included. Compared with traditional palpation, ultrasound guidance significantly increased the first-attempt success rate of radial artery catheterization (RR 1.51, 95% CI 1.07–2.14, P?=?0.02). Subgroup analyses suggested that the superiority of ultrasound guidance for radial artery catheterization was significant when the technique was operated by experienced users, performed in small children and infants, and on elective procedures in the operating room. In addition, ultrasound guidance significantly reduced mean-attempts to success (WMD ?1.13, 95% CI ?1.58 to ?0.69, P<0.00001), mean-time to success (WMD ?74.77s, 95% CI ?137.89s to ?11.64s, P?=?0.02), and the occurrence of hematoma (RR 0.17, 95% CI 0.07–0.41, P?=?0.0001). Conclusions The present meta-analysis suggests a clear benefit from ultrasound guidance for radial artery catheterization compared with the traditional palpation. Preliminary training and familiarization with the ultrasound-guided technique is needed before applying it for radial artery catheterization, especially for inexperienced operators. PMID:25375152

Zhao, Liang; Xi, Huijun; Guo, Zhihong; Li, Xiuyun; Gao, Chengjie; Wang, Jian; Zhou, Lingjun

2014-01-01

39

Coil Embolization Treatment in Pulmonary Artery Branch Rupture During Swan-Ganz Catheterization  

SciTech Connect

Rupture of the pulmonary artery or one of its branches during Swan-Ganz catheterization is a complication that is rare but remains fatal in almost 50% of cases. The risk factors and mechanisms involved in the pathogenesis of this accident have been widely reported. Management is twofold: resuscitation procedures and specific medical or even surgical treatment. We report a case of pulmonary artery rupture occurring during Swan-Ganz catheterization that was treated by coil embolization. This technique, which is quick and simple to use, would appear to be very promising. This is the first case of successful emergency treatment of pulmonary artery rupture using an endovascular technique.

Gottwalles, Yannick [Intensive Care Unit GHPCA, Saint Joseph Clinic, 16, Rue Roesselmann, F-68027 Colmar Cedex (France); Wunschel-Joseph, Marie-Eve; Hanssen, Michel [Interventional Cardiology Unit, General Hospital, 64, Avenue du Professeur Leriche, F-67504 Haguenau Cedex (France)

2000-11-15

40

La réparation sphinctérienne directe: points techniques, indications et résultats  

PubMed Central

L'incontinence anale est un handicap physique, psychique et social majeur qui a de nombreuses causes différentes. Les méthodes actuellement disponibles pour améliorer les symptômes de cette incontinence sont les méthodes médicales et de rééducation d'une part et les méthodes chirurgicales d'autre part. Quatre techniques chirurgicales répondent à ces objectifs pour la plupart des malades: la sphinctérorraphie, la neuromodulation des racines sacrées, et les deux techniques de substitution que sont le sphincter artificiel et la graciloplastie dynamisée. La réparation sphinctérienne directe est la technique la plus utilisée dans le traitement chirurgical de l'incontinence anale (IA) par lésion sphinctérienne. Cette technique est envisageable chez les malades ayant une incontinence fécale en rapport avec des lésions limitées du sphincter anal externe. La technique chirurgicale est simple (myorraphie par suture directe ou en paletot) et bien codifiée. Les résultats fonctionnels sont imparfaits et se dégradent avec la durée du suivi. Une continence parfaite après réparation sphinctérienne est rarement acquise de façon durable: le malade candidat à cette approche thérapeutique doit en être averti. PMID:23504542

Laalim, Said Ait; Hrora, Abdelmalek; Raiss, Mohammed; Ibnmejdoub, Karim; Toughai, Imane; Ahallat, Mohammed; Mazaz, Khalid

2013-01-01

41

[Magnetic resonance enterography: technique and indications. Findings in Crohn's disease].  

PubMed

Radiology with oral contrast, or enteroclysis, have traditionally been the techniques of choice in the examination of the small intestine, due to the excellent visualisation of the mucosal pattern. However, the absence of extra-luminal information and the use of ionising radiation have replaced these examinations with sectional techniques which enable the abdominal cavity to be viewed with good resolution. Magnetic resonance enterography is a simple technique, with no ionising radiation, provided quality images, distends the intestinal lumen well by the administration of non-reabsorbable oral substances, minimises peristalsis, and establishes a protocol which includes sequences with intravenous contrast. These properties can be used in patients with Crohn's disease, achieving good diagnostic precision in the assessment of activity and monitoring of treatment, in intestinal obstruction, in the suspicion of small intestine tumours, and in paediatric patients due to it being harmless. PMID:22265162

Torregrosa, A; Pallardó, Y; Hinojosa, J; Insa, S; Molina, R

2013-09-01

42

CARDIAC CATHETERIZATION AND DEVICE IMPLANTATION LABORATORY  

E-print Network

, or device implantation. Outpatient referrals come from primary care physicians, surgeons, and cardiologistsCARDIAC CATHETERIZATION AND DEVICE IMPLANTATION LABORATORY DEPARTMENT OF VETERANS AFFAIRS PALO ALTO as the back-up for the first year fellow as well as the primary operator on coronary interventions and EP

Ford, James

43

Swan-Ganz - right heart catheterization  

MedlinePLUS

... Ganz catheterization can also be used to detect abnormal blood flow between two areas of the heart that are ... Abnormal results may be due to: Blood flow problems, such as heart failure or shock Heart valve disease Lung disease Structural problems with the ...

44

Safety and Feasibility of Transulnar Cardiac Catheterization  

PubMed Central

Recently, ulnar artery cannulation has been described as an alternative to the transfemoral and radial approaches to vascular access for cardiac catheterization. This study was designed to evaluate the safety and feasibility of the ulnar approach. From September 2004 through September 2006, 28 patients in a cohort study underwent cardiac catheterization by the transulnar approach. Patients were eligible if they had scheduled an elective cardiac catheterization or angioplasty procedure and displayed a palpable ulnar pulse and a positive reverse Allen's test (< 10 sec). Further, we enrolled only patients who had stable angina. After cannulation, a 5F or 6F introducer was placed inside the vessel, and cardiac catheterization or angioplasty was performed. The patients underwent clinical examination when discharged from the hospital and again at the 1-week follow up. Mean age, weight, and height of the patients were 60 ± 14 years, 78 ± 14 kg, and 148 ± 55 cm, respectively, and 69% were men. Successful puncture was achieved in 93% (26/28), and in all 26 of these patients the procedure could be completed by the ulnar approach. The femoral approach was used for the remaining 2 patients. No cases of arterial spasm or loss of pulse were observed. Two patients had minor hematoma at the entry site. There were no cases of pseudoaneurysm, bleeding episodes requiring transfusion, or vascular perforation. We conclude that the transulnar approach is a safe and feasible alternative for diagnostic and therapeutic coronary intervention. PMID:18941595

Knebel, Alexis Vasiluk; Cardoso, Cristiano Oliveira; Correa Rodrigues, La Hore; Sarmento-Leite, Rogério Eduardo Gomes; de Quadros, Alexandre Schaan; Mascia Gottschall, Carlos Antonio

2008-01-01

45

Fluoroscopic decompression of the acutely dilated colon: Indications and technique  

Microsoft Academic Search

Decompression of the acutely dilated colon under fluoroscopy while using a nonendoscopic technique was first suggested by surgeons in 1975. Most radiologists are not familiar with this methodology, since the entities treated are uncommonly encountered by the general radiologist. Although endorsed by both radiologists and gastroenterologists as a preferred approach in patients with acute colonic pseudo-obstruction, it is also a

Greg Bender; George J. Hunter; Amy Tsuchida; James Timmons

1997-01-01

46

Immersion Fluid Refractive Indices Using Prism Minimum Deviation Techniques  

Microsoft Academic Search

Immersion fluids for 157 nm and 193 nm immersion lithography have been measured over the spectral range from 156 nm to 1700 nm in a nitrogen purged environment. The refractive index n and k of several candidate fluids have been measured using the prism minimum deviation technique implemented on a commercial Variable Angle Spectroscopic Ellipsometer (VASE®) system. For measurement the

Roger H. French; Min K. Yang; M. F. Lemon; R. A. Synowicki; Greg K. Pribil; Gerald T. Cooney; Craig M. Herzinger; Steven E. Green; John H. Burnett; Simon Kaplan

47

Central venous access: techniques and indications in oncology  

Microsoft Academic Search

Long lines can be inserted centrally or peripherally through patent veins into the central venous system down to the atrial\\u000a caval junction. Traditionally surgeons, anesthetists, cardiologists and more recently interventional radiologists have been\\u000a placing them using vein cutdown or percutaneous needle puncture techniques. Typical candidates for implanted venous catheters\\u000a are cancer patients undergoing long-term chemotherapy. The most important issues, in

Pierre-Yves Marcy; Antoine Lacassagne Anticancer

2008-01-01

48

Venous Access Ports: Indications, Implantation Technique, Follow-Up, and Complications  

SciTech Connect

The subcutaneous venous access device (SVAD or 'port') is a critical component in the care of patients with chronic disease. The modern SVAD provides reliable access for blood withdrawal and medication administration with minimal disruption to a patient's lifestyle. Because of improved materials and catheter technology, today's ports are lighter and stronger and capable of high-pressure injections of contrast for cross-sectional imaging. The majority of SVAD placement occurs in interventional radiology departments due to their ability to provide this service at lower costs, lower, complication rates, and greater volumes. Port-insertion techniques vary depending on the operator, but all consist of catheter placement in the central venous circulation followed by subcutaneous pocket creation and port attachment to the catheter with fixation and closure of the pocket. Venous access challenges occasionally occur in patients with central vein occlusions, necessitating catheterization of collateral veins or port placement in alternate locations. Complications of SVADs include those associated with the procedure as well as short- (<30 days) and long-term problems. Procedural and early complications are quite rare due to the near-universal use of real-time ultrasound guidance for vein puncture, but they can include hematoma, catheter malposition, arrhythmias, and pneumothorax. Late problems include both thrombotic complications (native venous or port-catheter thrombosis) and infections (tunnel or pocket infections or catheter-associated bloodstream infections). Most guidelines suggest that 0.3 infections/1000 catheter days is an appropriate upper threshold for the insertion of SVADs.

Walser, Eric M., E-mail: walser.eric@mayo.edu [Mayo Clinic, Department of Radiology (United States)

2012-08-15

49

Technique, indications, and results of proximal medial gastrocnemius lengthening.  

PubMed

Gastrocnemius proximal lengthening was first performed to correct spasticity in children, and was adapted for the patient with no neuromuscular condition in the late 1990s. Since then, the proximal gastrocnemius release has become less invasive and has evolved to include only the fascia overlying the medial head of the gastrocnemius muscle. The indications for performing this procedure are a clinically demonstrable gastrocnemius contracture that influences a variety of clinical conditions in the forefoot, hindfoot, and ankle. It is a safe and easy procedure that can be performed bilaterally simultaneously, and does not require immobilization of the ankle after surgery. PMID:25456723

Barouk, Pierre

2014-12-01

50

[Techniques of preparation and indications of labile blood products].  

PubMed

Labile blood products are obtained from samples of whole blood or aphaeresis. The techniques of preparation evolve with technological advances, which allow both an increasing automation and an intensification of the sanitary safety of the blood products. Over the last ten years, thanks to the availability of new technologies, several measures have been introduced in order to reduce the risk of transmission of pathogens and prevent the onset of transfusion-related acute lung injury (TRALI): leukoreduction, use of platelet storage solutions, inactivation of plasma and presumably of platelets in a very near future. The control of transfusion risk also depends on proper use of labile blood products. To assist the prescriber in his treatment options and to standardize practices, the French Agency for Sanitary Safety of Health Products has issued recommendations in terms of utilization of blood products that are detailed in this review of major labile blood products available. PMID:21474355

Clément, S

2011-04-01

51

Current indications for and the technique of wrist arthroscopy.  

PubMed

Since its introduction more than 30 years ago, wrist arthroscopy has become an essential diagnostic and therapeutic tool in hand surgery. This procedure minimizes exposures and allows access to otherwise remotely located anatomic regions with minimal morbidity. Advances in anatomic understanding and wrist scope technology have standardized the procedure and expanded indications. Current applications are diagnostic staging of various wrist pathologies where arthroscopy allows for a direct, magnified, and tactile-assisted examination. This includes injuries to the triangular fibrocartilage complex (TFCC), osteochondral lesion of the carpus, and dynamic assessment of carpal instability and radiocarpal arthritis. Therapeutic applications have continued to expand and include arthroscopic-assisted fracture reductions, treatment of radiocarpal synovitis and arthritis, TFCC repairs, and arthroscopic management of soft tissue pathologies such as ganglion excisions and release of contractures. PMID:24754550

Wagner, Jennifer; Ipaktchi, Kyros; Livermore, Meryl; Banegas, Rodrigo

2014-04-01

52

Contrast-Induced Neurotoxicity following Cardiac Catheterization  

PubMed Central

We report a case of probable contrast-induced neurotoxicity that followed a technically challenging cardiac catheterization in a 69-year-old woman. The procedure had involved the administration of a large cumulative dose of an iodinated, nonionic contrast medium into the innominate artery: twelve hours following the catheterization, the patient developed a seizure followed by a left hemiplegia, and an initial computed tomography (CT) scan showed sulcal effacement in the right cerebral hemisphere due to cerebral swelling. The patient's clinical symptoms resolved within 24 hours, and magnetic resonance imaging at 32 hours showed resolution of swelling. Contrast-induced neurotoxicity should be found in the differential diagnosis of acute neurological deficits occurring after radiological procedures involving iodinated contrast media, whether ionic or nonionic. PMID:23251169

Law, Susan; Panichpisal, Kessarin; Demede, Melaku; John, Sabu; Marmur, Jonathan D.; Nath, Jaya; Baird, Alison E.

2012-01-01

53

Dorsal aorta catheterization in rainbow trout (Salmo gairdneri). II. Glucocorticoid levels, hematological data and resumption  

E-print Network

for the erythrocyte loss. The results of this investigation indicate that well-adapted catheterized trout may of dorsal aorta or heart cannulation allows serial blood sampling from unanesthetized, free-swimming fish concentrations have been recorded in cannulated fishes (Houston et al., 1969 and 1971b ; Soivio et at., 1972

Paris-Sud XI, Université de

54

Myocardial blood flow: Roentgen videodensitometry techniques  

NASA Technical Reports Server (NTRS)

The current status of roentgen videodensitometric techniques that provide an objective assessment of blood flow at selected sites within the coronary circulation were described. Roentgen videodensitometry employs conventional radiopaque indicators, radiological equipment and coronary angiographic techniques. Roentgen videodensitometry techniques developed in the laboratory during the past nine years, and for the past three years were applied to analysis of angiograms in the clinical cardiac catheterization laboratory.

Smith, H. C.; Robb, R. A.; Wood, E. H.

1975-01-01

55

Anesthesia and the pediatric cardiac catheterization suite: a review.  

PubMed

Advances in technology over the last couple of decades have caused a shift in pediatric cardiac catheterization from a primary focus on diagnostics to innovative therapeutic interventions. These improvements allow patients a wider range of nonsurgical options for treatment of congenital heart disease. However, these therapeutic modalities can entail higher risk in an already complex patient population, compounded by the added challenges inherent to the environment of the cardiac catheterization suite. Anesthesiologists caring for children with congenital heart disease must understand not only the pathophysiology of the disease but also the effects the anesthetics and interventions have on the patient in order to provide a safe perioperative course. It is the aim of this article to review the latest catheterization modalities offered to patients with congenital heart disease, describe the unique challenges presented in the cardiac catheterization suite, list the most common complications encountered during catheterization and finally, to review the literature regarding different anesthetic drugs used in the catheterization lab. PMID:25331288

Lam, Jennifer E; Lin, Erica P; Alexy, Ryan; Aronson, Lori A

2015-02-01

56

21 CFR 870.1310 - Vessel dilator for percutaneous catheterization.  

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES CARDIOVASCULAR DEVICES Cardiovascular Diagnostic Devices § 870.1310 Vessel dilator for percutaneous catheterization. (a)...

2014-04-01

57

21 CFR 870.1310 - Vessel dilator for percutaneous catheterization.  

Code of Federal Regulations, 2013 CFR

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES CARDIOVASCULAR DEVICES Cardiovascular Diagnostic Devices § 870.1310 Vessel dilator for percutaneous catheterization. (a)...

2013-04-01

58

Prognostic value of left ventricular diastolic dysfunction in patients undergoing cardiac catheterization for coronary artery disease.  

PubMed

We hypothesized that left ventricular (LV) diastolic dysfunction assessed by cardiac catheterization may be associated with increased risk for cardiovascular events. To test the hypothesis, we assessed diastolic function by cardiac catheterization (relaxation time constant (Tau) and end-diastolic pressure (EDP)) as well as Doppler echocardiography (early diastolic mitral annular velocity (e') and a ratio of early diastolic mitral inflow to annular velocities (E/e')) in 222 consecutive patients undergoing cardiac catheterization for coronary artery disease (CAD). During a followup of 1364 ± 628 days, 5 cardiac deaths and 20 unscheduled cardiovascular hospitalizations were observed. Among LV diastolic function indices, Tau > 48?ms and e' < 5.8?cm/s were each significantly associated with lower rate of survival free of cardiovascular hospitalization. Even after adjustment for potential confounders (traditional cardiovascular risk factors, the severity of CAD, and cardiovascular medications), the predictive value of Tau > 48?ms and e' < 5.8?cm/s remained significant. No predictive value was observed in EDP, E/e', or LV ejection fraction. In conclusion, LV diastolic dysfunction, particularly impaired LV relaxation assessed by both cardiac catheterization and Doppler echocardiography, is independently associated with increased risk for cardiac death or cardiovascular hospitalization in patients with known or suspected CAD. PMID:22567531

Fukuta, Hidekatsu; Ohte, Nobuyuki; Wakami, Kazuaki; Goto, Toshihiko; Tani, Tomomitsu; Kimura, Genjiro

2012-01-01

59

Developing Tools to Measure Quality in Congenital Catheterization and Interventions: The Congenital Cardiac Catheterization Project on Outcomes (C3PO)  

PubMed Central

The broad range of relatively rare procedures performed in pediatric cardiac catheterization laboratories has made the standardization of care and risk assessment in the field statistically quite problematic. However, with the growing number of patients who undergo cardiac catheterization, it has become imperative that the cardiology community overcomes these challenges to study patient outcomes. The Congenital Cardiac Catheterization Project on Outcomes was able to develop benchmarks, tools for measurement, and risk adjustment methods while exploring procedural efficacy. Based on the success of these efforts, the collaborative is pursuing a follow-up project, the Congenital Cardiac Catheterization Project on Outcomes—Quality Improvement, aimed at improving the outcomes for all patients undergoing catheterization for congenital heart disease by reducing radiation exposure. PMID:25114756

2014-01-01

60

An Improved Procedure for Catheterization of the Thoracic Spinal Subarachnoid Space in the Rat  

Microsoft Academic Search

Catheterizationofthesubarachnoidspaceprovidesacon- venientmeanstodeliverdrugsto,orcollectcerebrospinal fluidfrom,thespinalcordinanimalexperiments,andhas been instrumental to our understanding of spinal mecha- nismsthatunderlieanesthesia,analgesia,orcardiovascu- lar regulation. Experience gained over the years has re- vealed several shortcomings of this technique. We report a procedure that encompasses the benefits of direct sub- arachnoid catheterization of the rat thoracic spinal cord but circumvents the known shortcomings. An intrathecal catheter was fabricated with a small silicon

Y. Y. Poon; Alice Y. W. Chang; S. F. Ko; Samuel H. H. Chan

2005-01-01

61

A cost effective endovascular approach for management of post-catheterization profunda femoris artery pseudoaneurysm using thrombin  

PubMed Central

Post-catheterization PSA is one of the most commonly encountered vascular complications of cardiac and peripheral angiographic procedures. We report the case of patient who developed deep-seated profunda femoris artery pseudoaneurysm (PSA) following cardiac catheterization. Despite, repeated ultrasound guided compressions the PSA failed to close and instead produced local site pressure ulcers. The secondary infection followed which precluded use of percutaneous thrombin injection. The PSA was finally closed via a total endovascular technique combining intravascular thrombin injection and coil embolization, thus obviating the need for expensive measures like cover stents or invasive surgical repairs. PMID:24581101

Mohan, Bishav; Mohan, Gaurav; Tandon, Rohit; Kumbkarni, Shalinder; Chhabra, Shibba Takkar; Aslam, Naved; Sood, Naresh Kumar; Wander, Gurpreet Singh

2014-01-01

62

Ureteral Cannulation as a Complication of Urethral Catheterization  

PubMed Central

Urinary catheterization is a common procedure, particularly among patients with neurogenic bladder secondary to spinal cord injury. Urethral catheterization is associated with the well-recognized complications of catheter-associated urinary tract infections and limited genitourinary trauma. Unintentional ureteral cannulation represents a rare complication of urethral catheterization and has been previously described in only eight cases within the literature. We describe two cases of aberrant ureteral cannulation involving two patients with quadriplegia. These cases along with prior reports identify the spastic, insensate bladder and altered pelvic sensorium found in upper motor neuron syndromes as major risk factors for ureteral cannulation with a urinary catheter. PMID:25405021

Greenlund, Andrew C.

2014-01-01

63

Use of structured personality survey techniques to indicate operator response to stressful situations  

SciTech Connect

Under given circumstances, a person will tend to operate in one of four dominant orientations: (1) to perform tasks; (2) to achieve consensus; (3) to achieve understanding, or (4) to maintain structure. Historically, personality survey techniques, such as the Myers-Briggs type indicator, have been used to determine these tendencies. While these techniques can accurately reflect a person's orientation under normal social situations, under different sets of conditions, the same person may exhibit other tendencies, displaying a similar or entirely different orientation. While most do not exhibit extreme tendencies or changes of orientation, the shift in personality from normal to stressful conditions can be rather dramatic, depending on the individual. Structured personality survey techniques have been used to indicate operator response to stressful situations. These techniques have been extended to indicate the balance between orientations that the control room team has through the various levels of cognizance.

Waller, M.A.

1990-01-01

64

Radial artery avulsion-A rare complication of transradial catheterization.  

PubMed

Transradial access is becoming the default mode of catheterization in a growing number of centers in the United States. The increasing utilization of transradial access has led to significant reduction in access site complications especially bleeding complications. We report a rare complication of transradial catheterization of radial artery avulsion, which was successfully treated in an endovascular fashion during the index procedure. © 2014 Wiley Periodicals, Inc. PMID:24760472

Alkhouli, Mohamad; Cohen, Howard A; Bashir, Riyaz

2015-01-01

65

Multimodality 3-Dimensional Image Integration for Congenital Cardiac Catheterization  

PubMed Central

Cardiac catheterization procedures for patients with congenital and structural heart disease are becoming more complex. New imaging strategies involving integration of 3-dimensional images from rotational angiography, magnetic resonance imaging (MRI), computerized tomography (CT), and transesophageal echocardiography (TEE) are employed to facilitate these procedures. We discuss the current use of these new 3D imaging technologies and their advantages and challenges when used to guide complex diagnostic and interventional catheterization procedures in patients with congenital heart disease. PMID:25114757

2014-01-01

66

Superciliary Keyhole Approach for Unruptured Anterior Circulation Aneurysms: Surgical Technique, Indications, and Contraindications  

PubMed Central

Neurosurgeons have been trying to reduce surgical invasiveness by applying minimally invasive keyhole approaches. Therefore, this paper clarifies the detailed surgical technique, its limitations, proper indications, and contraindications for a superciliary keyhole approach as a minimally invasive modification of a pterional approach. Successful superciliary keyhole surgery for unruptured aneurysms requires an understanding of the limitations and the use of special surgical techniques. Essentially, this means the effective selection of surgical indications, usage of the appropriate surgical instruments with a tubular shaft, and refined surgical techniques, including straightforward access to the aneurysm, clean surgical dissection, and the application of clips with an appropriate configuration. A superciliary keyhole approach allows unruptured anterior circulation aneurysms to be clipped safely, rapidly, and less invasively on the basis of appropriate surgical indications.

2014-01-01

67

Endoscopic examination of the urethra and the urinary bladder in dogs -- indications, contraindications and performance technique.  

PubMed

This paper discusses indications, contraindications, and likely complications following the endoscopic examination of the urethra and the urinary bladder in dogs. In addition, the procedure performance techniques and evaluation of the particular sections of the lower urinary tract are presented as well as the equipment used for the urethrocystoscopy. PMID:24597320

Grzegory, M; Kubiak, K; Jankowski, M; Spuzak, J; Gli?ska-Suchocka, K; Nicpo?, J; Halo?, A

2013-01-01

68

Lung radiofrequency and microwave ablation: a review of indications, techniques and post-procedural imaging appearances.  

PubMed

Lung ablation can be used to treat both primary and secondary thoracic malignancies. Evidence to support its use, particularly for metastases from colonic primary tumours, is now strong, with survival data in selected cases approaching that seen after surgery. Because of this, the use of ablative techniques (particularly thermal ablation) is growing and the Royal College of Radiologists predict that the number of patients who could benefit from such treatment may reach in excess of 5000 per year in the UK. Treatment is often limited to larger regional centres, and general radiologists often have limited awareness of the current indications and the techniques involved. Furthermore, radiologists without any prior experience are frequently expected to interpret post-treatment imaging, often performed in the context of acute complications, which have occurred after discharge. This review aims to provide an overview of the current indications for pulmonary ablation, together with the techniques involved and the range of post-procedural appearances. PMID:25465192

Smith, S L; Jennings, P E

2015-02-01

69

Enoxaparin Treatment of Spontaneous Deep Vein Thrombosis in a Chronically Catheterized Rhesus Macaque (Macaca mulatta)  

PubMed Central

A chronically catheterized 14-y-old male rhesus macaque (Macaca mulatta) was reported for recurrent scrotal swelling. The scrotum was enlarged and warm to touch, and associated skin was noted to be lichenified on physical examination. The penis could not be extruded due to preputial swelling. Results from the following diagnostic tests were all unremarkable or within normal limits: scrotal aspirate, hematology, serum biochemistries, urinalysis, and radiography of the thorax, scrotum, and abdomen. Ultrasonography of lower extremities identified thrombi in bilateral iliac veins and left femoral vein. Collateral circulation surrounding the left femoral vein permitted some compensatory venous return. The left femoral vein of this animal had been catheterized approximately 2 mo before initial presentation. A coagulation panel revealed a positive D-dimer test, indicative of elevated levels of fibrin degradation products due to active thrombus breakdown. Enoxaparin sodium, a low-molecular-weight heparin for human use, was administered at 20 mg subcutaneously once daily for 10 d to treat occlusive venous thrombi. After enoxaparin treatment, the edema was greatly decreased. To achieve complete resolution, a second course of enoxaparin was administered 2 months after the first. Ultrasonography of the pelvic vasculature 6 mo after completion of therapy showed marked thrombus resolution, allowing for bilateral patency in the iliac and femoral veins. Follow-up evaluation revealed that D-dimer values were negative as well. This case demonstrates the novel application of the human medication enoxaparin to treat clinical signs of deep vein thrombosis in a chronically catheterized rhesus macaque. PMID:19807974

Wathen, Asheley B; Myers, Daniel D; Zajkowski, Paul; Flory, Graham; Hankenson, F Claire

2009-01-01

70

Development of Needle Insertion Manipulator for Central Venous Catheterization  

NASA Astrophysics Data System (ADS)

Central venous catheterization is a procedure, which a doctor insert a catheter into the patient’s vein for transfusion. Since there are risks of bleeding from arterial puncture or pneumothorax from pleural puncture. Physicians are strictly required to make needle reach up into the vein and to stop the needle in the middle of vein. We proposed a robot system for assisting the venous puncture, which can relieve the difficulties in conventional procedure, and the risks of complication. This paper reports the design structuring and experimental results of needle insertion manipulator. First, we investigated the relationship between insertion force and angle into the vein. The results indicated that the judgment of perforation using the reaction force is possible in case where the needling angle is from 10 to 20 degree. The experiment to evaluate accuracy of the robot also revealed that it has beyond 0.5 mm accuracy. We also evaluated the positioning accuracy in the ultrasound images. The results displays that the accuracy is beyond 1.0 mm and it has enough for venous puncture. We also carried out the venous puncture experiment to the phantom and confirm our manipulator realized to make needle reach up into the vein.

Kobayashi, Yo; Hong, Jaesung; Hamano, Ryutaro; Hashizume, Makoto; Okada, Kaoru; Fujie, Masakatsu G.

71

Endovascular Aortic Aneurysm Repair with Chimney and Snorkel Grafts: Indications, Techniques and Results  

SciTech Connect

The chimney technique in endovascular aortic aneurysm repair (Ch-EVAR) involves placement of a stent or stent-graft parallel to the main aortic stent-graft to extend the proximal or distal sealing zone while maintaining side branch patency. Ch-EVAR can facilitate endovascular repair of juxtarenal and aortic arch pathology using available standard aortic stent-grafts, therefore, eliminating the manufacturing delays required for customised fenestrated and branched stent-grafts. Several case series have demonstrated the feasibility of Ch-EVAR both in acute and elective cases with good early results. This review discusses indications, technique, and the current available clinical data on Ch-EVAR.

Patel, Rakesh P., E-mail: rpatel9@nhs.net [Northwick Park Hospital, Department of Vascular Radiology (United Kingdom); Katsargyris, Athanasios, E-mail: kthanassos@yahoo.com; Verhoeven, Eric L. G., E-mail: Eric.Verhoeven@klinikum-nuernberg.de [Klinikum Nuernberg, Department of Vascular and Endovascular Surgery (Germany)] [Klinikum Nuernberg, Department of Vascular and Endovascular Surgery (Germany); Adam, Donald J., E-mail: donald.adam@tiscali.co.uk [Heartlands Hospital, Department of Vascular Surgery (United Kingdom); Hardman, John A., E-mail: johnhardman@doctors.org.uk [Royal United Hospital Bath, Department of Vascular Radiology (United Kingdom)

2013-12-15

72

Combined Hip Arthroscopy and Periacetabular Osteotomy: Indications, Advantages, Technique, and Complications  

PubMed Central

Evaluation and treatment of concomitant intra-articular pathology may be beneficial before periacetabular osteotomy (PAO) is performed. Hip arthroscopy before PAO allows the surgeon to perform full inspection of the hip joint and can be used to treat hip pathology before osteotomy. The indications for hip arthroscopy before PAO are presented in this article. The combined surgical procedure is described, along with potential complications. The advantages and disadvantages of this technique are outlined. PMID:24843847

Domb, Benjamin; LaReau, Justin; Redmond, John M.

2014-01-01

73

Lateral unicompartimental knee arthroplasty: indications, technique and short-medium term results  

Microsoft Academic Search

Lateral unicompartmental knee arthroplasty (UKA) is a valid alternative treatment in the event of arthritis confined to the\\u000a lateral compartment. This paper examines its indications, technique and short to medium-term results. A total of 159 Miller–Galante\\u000a cemented UKA prostheses (Zimmer, Warsaw, Indiana) were implanted consecutively (131 medial and 28 lateral) by the same surgeon.\\u000a This study investigates 28 lateral UKAs

Piero Volpi; Luca Marinoni; Corrado Bait; Marco Galli; Matteo Denti

2007-01-01

74

Pirogoff amputation for a bilateral traumatic lower-extremity amputee: indication and technique.  

PubMed

Although only a small portion of all lower-extremity amputations in the United States are of traumatic origin, almost half of all living amputees have sustained traumatic amputations. This particular epidemiology is explained by the younger age, and thus longer life expectancy, of traumatic amputees. In this group especially, restoration and lifelong maintenance of ambulation and mobility is essential. The authors present the case of a bilateral traumatic lower-leg amputee whose management included a Pirogoff amputation. Although this amputation technique is not widely used, the authors believe it greatly facilitated stump and soft tissue management in this case and allowed for improved mobility. The indication for and technique of Pirogoff amputation are described, and a brief overview of amputation techniques in the foot is provided. PMID:24972429

Ipaktchi, Kyros; Seidl, Adam; Banegas, Rodrigo; Hak, David; Mauffrey, Cyril

2014-06-01

75

Quantifying the Improvement of Surrogate Indices of Hepatic Insulin Resistance Using Complex Measurement Techniques  

PubMed Central

We evaluated the ability of simple and complex surrogate-indices to identify individuals from an overweight/obese cohort with hepatic insulin-resistance (HEP-IR). Five indices, one previously defined and four newly generated through step-wise linear regression, were created against a single-cohort sample of 77 extensively characterised participants with the metabolic syndrome (age 55.6±1.0 years, BMI 31.5±0.4 kg/m2; 30 males). HEP-IR was defined by measuring endogenous-glucose-production (EGP) with [6–62H2] glucose during fasting and euglycemic-hyperinsulinemic clamps and expressed as EGP*fasting plasma insulin. Complex measures were incorporated into the model, including various non-standard biomarkers and the measurement of body-fat distribution and liver-fat, to further improve the predictive capability of the index. Validation was performed against a data set of the same subjects after an isoenergetic dietary intervention (4 arms, diets varying in protein and fiber content versus control). All five indices produced comparable prediction of HEP-IR, explaining 39–56% of the variance, depending on regression variable combination. The validation of the regression equations showed little variation between the different proposed indices (r2?=?27–32%) on a matched dataset. New complex indices encompassing advanced measurement techniques offered an improved correlation (r?=?0.75, P<0.001). However, when validated against the alternative dataset all indices performed comparably with the standard homeostasis model assessment for insulin resistance (HOMA-IR) (r?=?0.54, P<0.001). Thus, simple estimates of HEP-IR performed comparable to more complex indices and could be an efficient and cost effective approach in large epidemiological investigations. PMID:22761721

Hattersley, John G.; Möhlig, Matthias; Roden, Michael; Arafat, Ayman M.; Loeffelholz, Christian v.; Nowotny, Peter; Machann, Jürgen; Hierholzer, Johannes; Osterhoff, Martin; Khan, Michael; Pfeiffer, Andreas F. H.; Weickert, Martin O.

2012-01-01

76

A prospective study on incidence and risk factors of arteriovenous fistulae following transfemoral cardiac catheterization  

Microsoft Academic Search

Background: A potentially harmful complication of cardiac catheterization is the arteriovenous fistula. Precise knowledge of possible factors predisposing for acquisition of iatrogenic AV-fistulae could enable cardiologists to perform a risk stratification for cardiac patients prior to catheterization. Methods: Over a period of 2 years, 10?271 consecutive patients who underwent cardiac catheterization were included in this study. Auscultation of a new

Stefan Martin Perings; Malte Kelm; Thomas Jax; Bodo Eckehard Strauer

2003-01-01

77

Teaching Self-Catheterization Skills to a Child with Myelomeningocele in a Preschool Setting.  

ERIC Educational Resources Information Center

Simulation training and a prompt hierarchy were found to facilitate acquisition of clean intermittent self-catheterization skills by a four-year-old male with myelomeningocele. The child was first taught to perform catheterization on a doll, then on himself. Skills were clustered into three tasks of diapering, cleansing, and catheterization.…

Robertson, Jo; And Others

1992-01-01

78

Treatment of medial and posteromedial knee instability: indications, techniques, and review of the results.  

PubMed Central

Injuries of the posteromedial corner of the knee are relatively common. These can be isolated or combined with other ligament lesions. In some cases the treatment of postero-medial corner injuries is controversial. After a brief description of the anatomy and biomechanics of the medial side of the knee, this paper reviews the indications for isolated and multiligamentous medial/posteromedial corner injuries both in the acute and in the chronic setting. In addition, the most common surgical techniques for repair and reconstruction are described in addition to outcomes based upon a review of the literature. PMID:23576938

Bonasia, D. E.; Bruzzone, M.; Dettoni, F.; Marmotti, A.; Blonna, D.; Castoldi, F.; Gasparetto, F.; D'Elicio, D.; Collo, G.; Rossi, R.

2012-01-01

79

Optical fibre techniques for use within tamper indicating enclosures designed for arms control verification purposes  

NASA Astrophysics Data System (ADS)

Ensuring that a future nuclear arms control agreement can be verified is a complex technical challenge. Tamper Indicating Enclosures (TIEs) are likely to be deployed as part of a chain of custody regime, providing an indication of an unauthorised attempt to access an item within the agreement. This paper focuses on the assessment of optical fibre techniques for ensuring boundary control as part of a TIE design. The results of optical fibre damage, subsequent repair attempts, enclosure construction considerations and unique identification features have been evaluated for a selection of fused-silica optical fibres. This paper focuses on detecting a fibre repair attempt, presents a method for increasing repair resistance and a method for uniquely identifying an enclosure using the optical signature from the embedded optical fibre.

Dyer, Thomas C.; Thompson, Alexander W. J.; Wynn, Paul; White, Helen

2014-10-01

80

An effective ostrich oil bleaching technique using peroxide value as an indicator.  

PubMed

Ostrich oil has been used extensively in the cosmetic and pharmaceutical industries. However, rancidity causes undesirable chemical changes in flavour, colour, odour and nutritional value. Bleaching is an important process in refining ostrich oil. Bleaching refers to the removal of certain minor constituents (colour pigments, free fatty acid, peroxides, odour and non-fatty materials) from crude fats and oils to yield purified glycerides. There is a need to optimize the bleaching process of crude ostrich oil prior to its use for therapeutic purposes. The objective of our study was to establish an effective method to bleach ostrich oil using peroxide value as an indicator of refinement. In our study, we showed that natural earth clay was better than bentonite and acid-activated clay to bleach ostrich oil. It was also found that 1 hour incubation at a 150 °C was suitable to lower peroxide value by 90%. In addition, the nitrogen trap technique in the bleaching process was as effective as the continuous nitrogen flow technique and as such would be the recommended technique due to its cost effectiveness. PMID:21730920

Palanisamy, Uma Devi; Sivanathan, Muniswaran; Radhakrishnan, Ammu Kutty; Haleagrahara, Nagaraja; Subramaniam, Thavamanithevi; Chiew, Gan Seng

2011-01-01

81

Reflections of six years of lead extraction: influence on indications and technique  

PubMed Central

Background Endovascular techniques have become the standard approach for extraction of pacemaker and ICD leads. However, with experience, the indications and technical approach have evolved. Indications In a population referred for lead extraction, we could not found a relation between the number of leads implanted and the incidence of occlusion of the access vein. Moreover, there is evidence that the lead extraction itself is accompanied with an increased risk of post-procedural venous occlusion. Electrical interference can be avoided in most cases, even in ICD patients. As complications of extraction have to be taken into account as well, it is therefore not in the patient's interest to extract chronically implanted non-functional superfluous leads. In contrast, lead extraction is a most effective way to cure pacemaker or ICD related infections, even if previous conservative therapy has failed. However, in patients at high risk, extraction might be deferred to attempt device saving therapy first. Technique Although leads can be removed with traction for almost all implant times, after six months additional tools are increasingly necessary to safely and completely extract them. No single technique suffices for all procedures: powered sheaths — as the laser sheath — and a femoral workstation with retrievers should be available when extraction is attempted. Complications Venous or myocardial perforation is a life-threatening complication of lead extraction. In these circumstances, time lacks to safely transfer a patient for emergency surgery and therefore the only safe environment to perform lead extraction is the operating theatre with cardiosurgical standby. ImagesFigure 1Figure 2Figure 3Figure 4Figure 5Figure 6Figure 7Figure 8Figure 9

Bracke, F.A.; Meijer, A.; van Gelder, B.

2004-01-01

82

Hepatectomy for resectable colorectal cancer metastases--indicators of prognosis, definition of resectability, techniques and outcomes.  

PubMed

The field of surgery for liver metastases is evolving rapidly. The proportion of patients viewed as amenable to resection is increasing with surgeons becoming more aggressive and systemic therapy more effective. Surgical resection is associated with low mortality and overall 5-year survival approaching 40%. Best candidates for resection are those with stage I or II colorectal cancer, fewer than 4 hepatic lesions, no lesions larger than 5 cm in diameter, no evidence of extra-hepatic disease, CEA level less than 5 ng/mL, and a disease-free interval of at least 2 years. Perioperative chemotherapy with or without biotherapies, in-situ ablation techniques, portal vein embolization, and staged hepatectomy have extended the indications without lessening the results of liver resection for colorectal metastases. PMID:17606190

Lupinacci, Renato; Penna, Christophe; Nordlinger, Bernard

2007-07-01

83

Computed tomography colonography in 2014: An update on technique and indications  

PubMed Central

Twenty years after its introduction, computed tomographic colonography (CTC) has reached its maturity, and it can reasonably be considered the best radiological diagnostic test for imaging colorectal cancer (CRC) and polyps. This examination technique is less invasive than colonoscopy (CS), easy to perform, and standardized. Reduced bowel preparation and colonic distention using carbon dioxide favor patient compliance. Widespread implementation of a new image reconstruction algorithm has minimized radiation exposure, and the use of dedicated software with enhanced views has enabled easier image interpretation. Integration in the routine workflow of a computer-aided detection algorithm reduces perceptual errors, particularly for small polyps. Consolidated evidence from the literature shows that the diagnostic performances for the detection of CRC and large polyps in symptomatic and asymptomatic individuals are similar to CS and are largely superior to barium enema, the latter of which should be strongly discouraged. Favorable data regarding CTC performance open the possibility for many different indications, some of which are already supported by evidence-based data: incomplete, failed, or unfeasible CS; symptomatic, elderly, and frail patients; and investigation of diverticular disease. Other indications are still being debated and, thus, are recommended only if CS is unfeasible: the use of CTC in CRC screening and in surveillance after surgery for CRC or polypectomy. In order for CTC to be used appropriately, contraindications such as acute abdominal conditions (diverticulitis or the acute phase of inflammatory bowel diseases) and surveillance in patients with a long-standing history of ulcerative colitis or Crohn’s disease and in those with hereditary colonic syndromes should not be overlooked. This will maximize the benefits of the technique and minimize potential sources of frustration or disappointment for both referring clinicians and patients. PMID:25492999

Laghi, Andrea

2014-01-01

84

Computed tomography colonography in 2014: An update on technique and indications.  

PubMed

Twenty years after its introduction, computed tomographic colonography (CTC) has reached its maturity, and it can reasonably be considered the best radiological diagnostic test for imaging colorectal cancer (CRC) and polyps. This examination technique is less invasive than colonoscopy (CS), easy to perform, and standardized. Reduced bowel preparation and colonic distention using carbon dioxide favor patient compliance. Widespread implementation of a new image reconstruction algorithm has minimized radiation exposure, and the use of dedicated software with enhanced views has enabled easier image interpretation. Integration in the routine workflow of a computer-aided detection algorithm reduces perceptual errors, particularly for small polyps. Consolidated evidence from the literature shows that the diagnostic performances for the detection of CRC and large polyps in symptomatic and asymptomatic individuals are similar to CS and are largely superior to barium enema, the latter of which should be strongly discouraged. Favorable data regarding CTC performance open the possibility for many different indications, some of which are already supported by evidence-based data: incomplete, failed, or unfeasible CS; symptomatic, elderly, and frail patients; and investigation of diverticular disease. Other indications are still being debated and, thus, are recommended only if CS is unfeasible: the use of CTC in CRC screening and in surveillance after surgery for CRC or polypectomy. In order for CTC to be used appropriately, contraindications such as acute abdominal conditions (diverticulitis or the acute phase of inflammatory bowel diseases) and surveillance in patients with a long-standing history of ulcerative colitis or Crohn's disease and in those with hereditary colonic syndromes should not be overlooked. This will maximize the benefits of the technique and minimize potential sources of frustration or disappointment for both referring clinicians and patients. PMID:25492999

Laghi, Andrea

2014-12-01

85

Burnei’s “double X" internal fixation technique for supracondylar humerus fractures in children: indications, technique, advantages and alternative interventions  

PubMed Central

Background. The Study and Research Group in Pediatric Orthopedics-2012 initated this retrospective study due to the fact that in Romania and in other countries, the numerous procedures do not ensure the physicians a definite point of view related to the therapeutic criteria in the treatment of supracondylar fractures. That is why the number of complications and their severity brought into notice these existent deficiencies. In order to correct some of these complications, cubitus varus or valgus, Prof. Al. Pesamosca communicated a paper called "Personal procedure in the treatment of posttraumatic cubitus varus" at the County Conference from Bac?u, in June 24, 1978. This procedure has next been made popular by Prof. Gh. Burnei and his coworkers by operating patients with cubitus varus or valgus due to supracondylar humeral fractures and by presenting papers related to the subject at the national and international congresses. The latest paper regarding this problem has been presented at the 29th Annual Meeting of the European Pediatric Orthopedic Society in Zagreb, Croatia, April 7-10, 2010, being titled “Distal humeral Z-osteotomy for posttraumatic cubitus varus or valgus", having as authors Gh. Burnei, Ileana Georgescu, ?tefan Gavriliu, Costel Vlad and Daniela Dan. As members of this group, based on the performed studies, we wish to make popular this type of osteosynthesis, which ensures a tight fixation, avoids complications and allows a rapid postoperative activity. Introduction. The acknowledged treatment for these types of fractures is the orthopedic one and it must be accomplished as soon as possible, in the first 6 hours, by reduction and cast immobilization or by closed or open reduction and fixation, using one of the several methods (Judet, Boehler, Kapandji, San Antonio, San Diego, Burnei’s double X technique). The exposed treatment is indicated in irreducible supracondylar humeral fractures, in reducible, but unstable type, in polytraumatized patients with supracondylar fractures, in supracondylar fractures with vascular injury, in late presenting fractures, in case of loss of reduction under cast immobilization or in case of surgery with other types of fixation that is deteriorated. We have been using Burnei’s osteosynthesis for about 10 years. Aim. This paper aims to present the operative technique, its results and advantages. Materials and methods. 56 cases were treated with Burnei’s "double X" osteosynthesis in "Alexandru Pesamosca" Surgery Clinics, from 2001 to 2011. We used the Kocher approach and the aim of surgery was to obtain a fixation that does not require cast immobilization and that allows motion 24 hours after the surgery. The wires placed in "double X" must not occupy the olecranon fossa. The reduction must be anatomical and the olecranon fossa free. Flexion and extension of the elbow must be in normal range after surgery without crackles or limitations. This surgery was performed on patients with: • Loss of reduction after 10 days with cast immobilization; • Surgery with other types of fixation, deteriorated; • Polytraumatized patients with supracondylar fracture; • After neglected or late presenting fractures, without the orthopedic reduction made in emergency; • Fractures with edema and blistering. Results and complications. The patients’ ages ranged 3 to12 years old, the mean age for girls was 7,3 years and 6,8 for boys. The hospitalization ranged 3 to 7 days, the average period being of 5 days. The wires had been pulled out after 21 days. The total recovery of the flexion and extension motion of the elbow was, depending on the age, between 21 and 40 days with an average period of 30 days. There were 5 cases of minor complications: in 3 cases the wires migrated outwards up to the 10th day and in 2 cases the wires were found in the olecranon fossa. The CT exam highlighted the impingement effect and the wire that passed through the olecranon fossa had to be removed between the 7th and the 9th day. No reported cas

Georgescu, I; Gavriliu, S; Pârvan, A; Martiniuc, A; Japie, E; Ghi??, R; Dr?ghici, I; Hamei, S; ?iripa, I; El Nayef, T; Dan, D

2013-01-01

86

Ensuring patient adherence to clean intermittent self-catheterization  

PubMed Central

Patient performance of clean intermittent self-catheterization is a crucial component of the management of incomplete bladder emptying, which can arise from a variety of conditions. This allows patients to have more control over their bladder emptying, and avoids the inconveniences that come with an indwelling urethral catheter. There are, however, barriers that patients face when performing this task which may ultimately limit adherence. In this article, these barriers are discussed in more detail with potential solutions to counter them. PMID:24611001

Seth, Jai H; Haslam, Collette; Panicker, Jalesh N

2014-01-01

87

Cardiac Stress Test Induced by Dobutamine and Monitored by Cardiac Catheterization in Mice  

PubMed Central

Dobutamine is a ?-adrenergic agonist with an affinity higher for receptor expressed in the heart (?1) than for receptors expressed in the arteries (?2). When systemically administered, it increases cardiac demand. Thus, dobutamine unmasks abnormal rhythm or ischemic areas potentially at risk of infarction. Monitoring of heart function during a cardiac stress test can be performed by either ecocardiography or cardiac catheterization. The latter is an invasive but more accurate and informative technique that the former. Cardiac stress test induced by dobutamine and monitored by cardiac catheterization accomplished as described here allows, in a single experiment, the measurement of the following hemodynamic parameters: heart rate (HR), systolic pressure, diastolic pressure, end-diastolic pressure, maximal positive pressure development (dP/dtmax) and maximal negative pressure development (dP/dtmin), at baseline conditions and under increasing doses of dobutamine. As expected, in normal mice we observed a dobutamine dose-related increase in HR, dP/dtmax and dP/dtmin. Moreover, at the highest dose tested (12 ng/g/min) the cardiac decompensation of high fat diet-induced obese mice was unmasked. PMID:23426115

Calligaris, Sebastián Dante; Ricca, Micaela; Conget, Paulette

2013-01-01

88

Bilateral cardiac catheterizations: the safety and feasibility of a superficial forearm venous and transradial arterial approach.  

PubMed

The transradial approach for left heart catheterization has become increasingly popular recently because of its clinical benefits. We examined the safety and feasibility of a transforearm approach for bilateral cardiac catheterizations, using the radial artery and a superficial forearm vein (the cephalic, basilic, or median antecubital vein). Between August 2002 and October 2003, 296 right heart catheterizations were performed in our hospital. A superficial forearm vein was used in one group of 101 patients, of which 98 had a concomitant left heart catheterization through the radial artery. The femoral vein was used for right heart catheterization in the second group of 195 patients. Of these patients, 37 underwent left heart catheterization through the radial artery and 157 through the femoral artery. All instances of bilateral catheterizations were successful except for one complication of pseudoaneurysm occurring in the transfemoral group. The procedure time for right heart catheterization was significantly less in the forearm group than the femoral group. The transforearm group had a larger proportion of males and of patients undergoing diagnostic right heart catheterization for congestive heart failure, dilated cardiomyopathy, and ischemic cardiomyopathy. Patients with aortic stenosis (AS), atrial septal defect (ASD), and mitral stenosis (MS) were mainly restricted to the transfemoral approach. We conclude that the transradial artery and superficial forearm venous approach for bilateral cardiac catheterizations is a safe and feasible alternative to the femoral approach in a wide range of patients, with the exception of patients with AS, ASD, or MS. PMID:16479037

Yang, Cheng-Hsu; Guo, G Bih-Fang; Yip, Hon-Kan; Hsieh, Kelvin; Fang, Chi-Yung; Chen, Shyh-Ming; Cheng, Cheng-I; Hang, Chi-Ling; Chen, Mien-Cheng; Wu, Chiung-Jen

2006-01-01

89

A Modified Catheterization Procedure to Reduce Bladder Damage when Collecting Urine Samples from Holstein Cows  

PubMed Central

ABSTRACT This study proposed a modified procedure, using a small balloon catheter (SB catheter, 45 ml), for reducing bladder damage in cows. Holstein cows and the following catheters were prepared: smaller balloon catheter (XSB catheter; 30 ml), SB catheter and standard balloon catheter (NB catheter; 70 ml, as the commonly used, standard size). In experiment 1, each cow was catheterized. The occurrence of catheter-associated hematuria (greater than 50 RBC/HPF) was lower in the SB catheter group (0.0%, n=7) than in the NB catheter group (71.4%, n=7; P<0.05). In experiment 2, general veterinary parameters, urine pH, body temperature and blood values in cows were not affected before or after insertion of SB catheters (n=6). The incidence of urinary tract infection (UTI) was 3.0% per catheterized day (n=22). In experiment 3, feeding profiles, daily excretion of urinary nitrogen (P<0.05) and rate from nitrogen intake in urine (P<0.01), were higher with use of the SB catheter (n=13) than with the use of the vulva urine cup (n=18), indicating that using the SB catheter can provide accurate nutritional data. From this study, we concluded that when using an SB catheter, the following results occur; reduction in bladder damage without any veterinary risks and accuracy in regard to feeding parameters, suggesting this modified procedure using an SB catheter is a useful means of daily urine collection. PMID:24561376

TAMURA, Tetsuo; NAKAMURA, Hiroshi; SATO, Say; SEKI, Makoto; NISHIKI, Hideto

2014-01-01

90

Study of the effectiveness of musical stimulation during intracardiac catheterization  

Microsoft Academic Search

Summary\\u000a \\u000a Background\\u000a   Intracardiac catheterization is a routine physical examination. Due to psychological strains, several psychosocial interventions,\\u000a including music therapy, have been proposed. The aim of the present study was to examine whether the preventive or adjuvant\\u000a use of music therapy results in a reduction in both subjective and objective anxiety and thus leads to a reduction in sedative\\u000a medication.\\u000a \\u000a \\u000a \\u000a \\u000a Methods

Heike Argstatter; Werner Haberbosch; Hans Volker Bolay

2006-01-01

91

Evaluation of energy performance indicators and financial aspects of energy saving techniques in residential real estate  

Microsoft Academic Search

The energy consumption in the existing residential building stock accounts for about 40% of the total energy consumption in the built environment. Different types of energy performance indicators to assess the energy consumption of buildings were and still are internationally under development. In this paper we compare the methodologies and accuracies of three Dutch energy performance indicators by applying them

A. G. Entrop; H. J. H. Brouwers; A. H. M. E. Reinders

2010-01-01

92

Understanding and Preparing for a CAtHeteRIZAtIon PRoCeDURe  

E-print Network

, and prevention of cardiovascular disease. One major advance in cardiology has been the introduction of cardiac catheterization for definitive diagnosis of cardiovascular disease. Cardiac catheterization was first performed method for both diagnosing and treating many cardiovascular diseases. At the Knight Center

Mootha, Vamsi K.

93

Pulmonary hypertension in sickle cell disease: cardiac catheterization results and survival  

Microsoft Academic Search

Few results on cardiac catheterization have been published for patients with sickle cell disease (SCD) with pulmonary hypertension (PHTN). Their survival once this complication develops is unknown. We analyzed hemodynamic data in 34 adult patients with SCD at right-sided cardiac catheterization and determined the relationship of PHTN to patient sur- vival. In 20 patients with PHTN the aver- age systolic,

Oswaldo Castro; Mohammed Hoque; Bernice D. Brown

2002-01-01

94

Effect of transradial access on quality of life and cost of cardiac catheterization: A randomized comparison  

Microsoft Academic Search

Background Transradial access is a recently developed alternative for diagnostic cardiac catheterization. Its effects on quality of life after the procedure, patient preference, and cost are unknown. Methods and Results We performed a randomized single-center trial in which 99 patients underwent transfemoral and 101 underwent transradial diagnostic cardiac catheterization. Quality of life was measured with the SF-36 and visual analog

Christopher J. Cooper; Reda A. El-Shiekh; David J. Cohen; Linda Blaesing; Mark W. Burket; Asish Basu; Joseph A. Moore

1999-01-01

95

COMPLEMENTARY IMAGING OF GRANULAR CoAg FILMS WITH MAGNETOOPTICAL INDICATOR FILM TECHNIQUE AND MAGNETIC  

E-print Network

AND MAGNETIC FORCE MICROSCOPY M.J. Donahue, L.H. Bennett, R.D. McMichael, L.J. Swartzendruber, A.J. Shapiro) technique and magnetic force microscopy were used for visualization and direct real­time experimental study magnetic multilayers [8]. We also illustrate the use of magnetic force microscopy (MFM) as a complementary

Donahue, Michael J.

96

INDICATOR OF EUTROPHICATION AND SEDIMENT LOAD: HYPERSPECTRAL TECHNIQUE FOR CONTINUOUS COVERAGE OF DEEP RIVERS  

EPA Science Inventory

Remote sensing techniques were used to characterize and quantify spatial and temporal variation in water quality of the Great Miami River in Ohio. An initial feasibility study was conducted in the summer of 1999 using a non-imaging hand-held spectroradiometer to ascertain the pr...

97

HYPERSPECTRAL TECHNIQUE AS AN INDICATOR OF EUTROPHICATION AND SEDIMENT LOAD FOR DEEP RIVERS  

EPA Science Inventory

Remote sensing techniques were used to characterize and quantify spatial and temporal variation in water quality of the Great Miami River in Ohio. An initial feasibility study was conducted in the summer of 1999 using a non-imaging hand-held spectroradiometer to ascertain the pre...

98

Total Reconstruction of the Auricle: Our Experiences on Indications and Recent Techniques  

PubMed Central

Introduction. Auricular reconstruction is a great challenge in facial plastic surgery. With the advances in surgical techniques and biotechnology, different options are available for consideration. The aim of this paper is to review the knowledge about the various techniques for total auricular reconstruction based on the literature and our experience. Methods. Approximately 179 articles published from 1980 to 2013 were identified, and 59 articles were included. We have focused on the current status of total auricular reconstruction based on our personal experience and on papers of particular interest, published within the period of review. We have also included a prospective view on the tissue engineering of cartilage. Results. Most surgeons still practice total auricular reconstruction by employing techniques developed by Brent, Nagata, and Firmin with autologous rib cartilage. Within the last years, alloplastic frameworks for reconstruction have become well established. Choosing the reconstruction techniques depends mainly on the surgeon's preference and experience. Prosthetic reconstruction is still reserved for special conditions, even though the material is constantly improving. Tissue engineering has a growing potential for clinical applicability. Conclusion. Auricular reconstruction still receives attention of plastic/maxillofacial surgeons and otolaryngologists. Even though clinical applicability lags behind initial expectations, the development of tissue-engineered constructs continues its potential development. PMID:24822198

Storck, K.; Staudenmaier, R.; Buchberger, M.; Strenger, T.; Kreutzer, K.; von Bomhard, A.; Stark, T.

2014-01-01

99

Diagnostic pediatric cardiac catheterization: Experience of a tertiary care pediatric cardiac centre  

PubMed Central

Background Cardiac catheterization was considered gold standard for confirmation of diagnosis and analyzing various management issues in congenital heart diseases. In spite of development of various non invasive tools for investigation of cardiac disorders diagnostic catheterization still holds an important place in pediatric patients. Methods 300 consecutive diagnostic cardiac catheterization performed since April 2007 were included in this study. The study was undertaken to evaluate the profile of patients undergoing diagnostic cardiac catheterization, its results, assess its safety and its contribution toward solving various management issues. Result & Conclusion Children who underwent cardiac catheterization ranged in weight from 1.6 kg to 35 kg, with their age range 0 day–12 years. The information obtained was of great importance for further management in over 90% cases. The procedure of cardiac cath is invasive, still it was proved to be quite safe even in smallest baby. PMID:24623940

Kumar, Prabhat; Joshi, Vidya Sagar; Madhu, P.V.

2013-01-01

100

The influences of census technique on estimating indices of macrofaunal population density in the temperate rocky subtidal zone  

Microsoft Academic Search

Several studies have attempted to compare subtidal animal population estimates obtained in a variety of ways using SCUBA diving and have reported a lot of variation between the estimates obtained. This study investigated individually scale-, tidal-, equipment- and observer-induced variation through analysis of animal population density indices obtained using a number of techniques based on SCUBA diver visual survey. The

MDJ Sayer; C Poonian

2007-01-01

101

Lymphatic microsurgery to treat lymphedema: techniques and indications for better results.  

PubMed

This study aimed to report new clinical approaches to the treatment of lymphatic disorders by microsurgical techniques based on histological and immunohistochemical findings. The authors' wide clinical experience in the treatment of patients with peripheral lymphedema by microsurgical techniques is reported. Microsurgical methods included derivative lymphatic-venous anastomoses and lymphatic reconstruction by interpositioned vein grafted shunts. In all patients, lymphatic and lymph nodal tissues were sent for histological assessment, together with specimen of the interstitial matrix. Diagnostic investigations consisted in venous duplex scan and lymphoscintigraphy. Results were assessed clinically by volumetry performed preoperatively and postoperatively at 3 to 6 months and at 1, 3, and 5 years. The outcome obtained in treating lymphedemas at different stages was analyzed for volume reduction, stability of results with time, reduction of dermatolymphangioadenitis attacks, necessity of wearing elastic supports, and use of conservative measures postoperatively. Microsurgical lymphatic derivative and reconstructive techniques allow bringing about positive results in the treatment of peripheral lymphedema, above all in early stages when tissular changes are slight and allow almost a complete restore of lymphatic drainage. PMID:23542829

Boccardo, Francesco; Fulcheri, Ezio; Villa, Giuseppe; Molinari, Lidia; Campisi, Corrado; Dessalvi, Sara; Murdaca, Giuseppe; Campisi, Caterina; Santi, Pier Luigi; Parodi, Aurora; Puppo, Francesco; Campisi, Corradino

2013-08-01

102

Tubal sterilization by selective catheterization in an animal model.  

PubMed

Unilateral selective salpingography was performed in 3 groups of 6 rabbits. 4-6 month old, virgin New Zealand White female rabbits were used with a mean weight of 4.4 kg. The fallopian tubes were embolized with ethanol (group 1); a viscous radiopaque solution which solidifies rapidly after injection to produce a biocompatible and inert hydrogel (group 2); or an occluding emulsion (a radiopaque heterogeneous alcoholic solution of zein, poppy seed oil, propylene glycol, and sodium amidotrizoate from Ethibloc, Laboratoire Princeps, Neuilly sur Seine, France) (group 3). Animals were killed 2 days or 30 days after the procedure, according to randomization; and tubal patency and histologic modifications were evaluated. Selective tubal catheterization was possible in all 18 cases, in 12 cases on the right side (66%), in 6 cases on the left side (33%); in 11 cases with a 5F catheter (61%), in 7 cases with a 2.5F catheter (39%). In group 1, no satisfactory occlusion was obtained; in group 2, 65% of the tubes were occluded with little histologic damage; and in group 3, 80% of the tubes were occluded, but significant inflammation and tissue necrosis were noted. The fallopian tubes were selectively catheterized over variable lengths: over 10 mm in 5 rabbits (28%), between 5 and 10 mm in 4 rabbits (22%), and between 1 and 5 mm in 9 rabbits (50%). Before injection of the occluding materials, all the catheterized tubes were patent. Mean volume of occluding material injected was 0.36 mL in group 1, 0.30 mL in group 2, and 0.83 mL in group 3. The ethanol injected reached the peritoneum in all 6 rabbits. The gel was injected an average length of 11 mm in the tube, while the emulsion opacified all the volume of the tubes with a peritoneal spill of emulsion in 3 of 6 cases. Reflux of occluding material into the uterus was noted in 1 of 6 rabbits in group 1, in 4 of 6 rabbits in group 2, in 3 of 6 rabbits in group 3. Selective salpingography proved a suitable method and allowed selective injection of occluding materials. PMID:8169090

Maubon, A; Rouanet, J P; Laurent, A; Joujoux, J M; Cover, S; Courtieu, C; Wassef, M; Godlewski, G; Honiger, J; Lopez, F M

1994-02-01

103

Incidence and Risk Factors of Cerebrovascular Events Following Cardiac Catheterization  

PubMed Central

Background One of the most daunting complications of cardiac catheterization is a cerebrovascular event (CVE). We aimed to assess the real?life incidence, etiology, and risk factors of cardiac catheterization?related acute CVEs in a large cohort of patients treated in a single center. Methods and Results We undertook a retrospective analysis of 43 350 coronary procedures performed on 30 907 procedure days over the period 1992?2011 and compared patient and procedural characteristics of procedures complicated by CVEs with the remaining cohort. CVEs occurred in 47 cases: 43 were ischemic, 3 intracerebral hemorrhages, and 1 undetermined. The overall CVE rate was 0.15%, with percutaneous coronary intervention (PCI) and diagnostic coronary angiography rates 0.23% and 0.09%, respectively. Using a forward stepwise multivariate logistic regression model including patient demographic and procedural characteristics, a total of 5 significant predictors were defined: prior stroke (OR=15.09, 95% CI [8.11 to 28.08], P<0.0001), presence of coronary arterial thrombus (OR=2.79, 95% CI [1.25 to 6.22], P=0.012), age >75 years (OR=3.33, 95% CI [1.79 to 6.19], P<0.0001), triple vessel disease (OR=2.24, 95% CI [1.20 to 4.18], P=0.011), and performance of intervention (OR=2.21, 95% CI [1.12 to 4.33], P=0.021). An additional analysis excluded any temporal change of CVE rates but demonstrated a significant increase of all high?risk patient features. Conclusion In a single?center, retrospective assessment over nearly 20 years, cardiac catheterization?related CVEs were very rare and nearly exclusively ischemic. The independent predictors for these events were found to be the performance of an intervention and those associated with increased atherosclerotic burden, specifically older age, triple vessel disease, and prior stroke. The presence of intracoronary thrombus appears also to raise the risk of procedure?related CVE. PMID:24231658

Korn?Lubetzki, Isabelle; Farkash, Rivka; Pachino, Rachel M.; Almagor, Yaron; Tzivoni, Dan; Meerkin, David

2013-01-01

104

Laser and high-frequency cauthery gingivectomy in nonperiodontal indications: assessment and comparison of techniques  

NASA Astrophysics Data System (ADS)

The authors have verified the efficiency and safety of laser and high-frequency gingivectomy in non-periodontal indications. Within a prospective, non-selective study, they treated and monitored 357 dental areas in 139 teeth.Out of the total number, 248 areas were treated wtih a diode laser, 980nm; 109 areas with high-frequency electrocautery. The following parameters were monitored: a) regeneration of the marginal gingiva; b) generation of iatrogenic recessions or periodontal pockets; c) bleeding from gingival sulcus during probing; d) changes in tooth vitality; e) patient's subjective evaluation. The authors identified a high degree of safety in both laser and high-frequency gingivectomy, with no significant difference between these two methods. Laser gingivectomy appears to have a wider indication range, while high-frequency gingivectomy requires lower financial expenses.

Bartak, Petr; Smucler, Roman

2003-06-01

105

Supporting 64-bit global indices in Epetra and other Trilinos packages : techniques used and lessons learned.  

SciTech Connect

The Trilinos Project is an effort to facilitate the design, development, integration and ongoing support of mathematical software libraries within an object-oriented framework. It is intended for large-scale, complex multiphysics engineering and scientific applications [2, 4, 3]. Epetra is one of its basic packages. It provides serial and parallel linear algebra capabilities. Before Trilinos version 11.0, released in 2012, Epetra used the C++ int data-type for storing global and local indices for degrees of freedom (DOFs). Since int is typically 32-bit, this limited the largest problem size to be smaller than approximately two billion DOFs. This was true even if a distributed memory machine could handle larger problems. We have added optional support for C++ long long data-type, which is at least 64-bit wide, for global indices. To save memory, maintain the speed of memory-bound operations, and reduce further changes to the code, the local indices are still 32-bit. We document the changes required to achieve this feature and how the new functionality can be used. We also report on the lessons learned in modifying a mature and popular package from various perspectives - design goals, backward compatibility, engineering decisions, C++ language features, effects on existing users and other packages, and build integration.

Jhurani, Chetan; Austin, Travis M.; Heroux, Michael Allen; Willenbring, James Michael

2013-06-01

106

Update on Endovascular Treatment of Peripheral Vascular Disease: New Tools, Techniques, and Indications  

PubMed Central

The treatment of peripheral vascular disease is one of the most rapidly expanding fields of medicine today. At one time, patients who had peripheral vascular disease had few medical or surgical options. Now, however, options abound. The number of peripheral interventions increased from 90,000 in 1994 to more than 200,000 in 1997, and endovascular techniques may soon replace up to 50% of traditional vascular operations. Cardiologists, interventional radiologists, and vascular surgeons bring various types of expertise to endovascular intervention; nonetheless, they seem to share similar levels of enthusiasm about this treatment option. The many advantages to the patient that such intervention offers over traditional surgery, such as the avoidance of anesthesia and other surgical risks, the rapid recovery time, and the relatively low treatment costs, provide encouragement to these specialists. Endovascular intervention requires dedication on the part of practitioners, because it demands such complete knowledge of vascular disease and of the anatomic changes experienced by the patient. The challenge is intensified by the continual introduction of new products and methods. We hope, herein, to offer pertinent information about recent advances in interventional techniques and devices, and to provide a framework for future education. PMID:11198311

Krajcer, Zvonimir; Howell, Marcus H.

2000-01-01

107

Transvenous hepatic biopsy in stable Fontan patients undergoing cardiac catheterization.  

PubMed

Liver pathology complicates Fontan palliation. Previous reports established that both hepatic sinusoidal and portal fibrosis occur in patients after Fontan procedures. Past studies predominantly included symptomatic patient cohorts. Thus, the authors of this study aimed to characterize hepatic pathology via transvenous hepatic biopsies in 21 asymptomatic patients at the time of elective cardiac catheterization. Seven of these patients (33 %) were accompanied by an interventional procedure. Hepatic biopsies showed evidence of either sinusoidal or portal fibrosis or both in all but one patient. The findings showed a statistically significant (p = 0.005) moderately strong positive correlation between fibrosis scores and time since Fontan surgery. Additionally, no significant correlation was found between fibrosis scores and inferior vena cava pressure, pulmonary vascular resistance, platelet counts, or serum laboratory testing of hepatic function. PMID:24817681

Evans, William N; Winn, Brody J; Yumiaco, Noel S; Galindo, Alvaro; Rothman, Abraham; Acherman, Ruben J; Restrepo, Humberto

2014-10-01

108

Cardiac catheterization: consequences for the endothelium and potential for nanomedicine.  

PubMed

Cardiac catheterization results in interactions between the catheter and surfaces and the artery lumen, which is lined by the endothelium. These interactions can range from minor rubbing to severe mechanical injury. Further, in the case of radial access, even atraumatic interactions have consequences ranging from clinical complications, such as radial spasm and radial occlusion, to lasting endothelial cell dysfunction. These consequences may be underappreciated; however, endothelial cells play a central role in maintaining vascular homeostasis via nitric oxide production. Existing treatment paradigms do not address endothelial dysfunction or damage and, thus, novel therapeutic approaches are needed. Nanomedicine, in particular, offers great potential in the form of targeted drug delivery, via functionalized coatings or nanocarriers, aimed at increased nitric oxide bioavailability or reduced inflammation. For further resources related to this article, please visit the WIREs website. Conflict of interest: The authors have declared no conflicts of interest for this article. PMID:25429858

Sobolewski, Peter; El Fray, Miroslawa

2014-11-27

109

Near infrared spectroscopy monitoring in the pediatric cardiac catheterization laboratory.  

PubMed

Near-infrared spectroscopy (NIRS) is a noninvasive method used to evaluate tissue oxygenation. We evaluated the relationship between cerebral and renal NIRS parameters during transcatheter intervention and adverse events in the catheterization room. Between January 1 and May 31, 2012, 123 of 163 pediatric patients undergoing cardiac catheterization were followed by NIRS. All were monitored by electrocardiography, noninvasive blood pressure measurement, pulse oxymetry, initial and final blood lactate level measurement. The number of interventional procedures was 73 (59%). During the procedures, 39 patients experienced a total of 41 adverse events: 18 (19.5%) had desaturation, 10 (8.1%) arrhythmia, three (2.4%) had respiratory difficulty, six (4.8%) had a situation calling for cardiopulmonary resuscitation, three (2.4%) had anemia necessitating transfusion, and one (0.8%) had a cyanotic spell. Cranial NIRS values worsened in 12 (9.8%) and renal measurements worsened in 13 (12.5%) patients. The sensitivity and specificity of a 9% impairment of cranial values were 90 and 61%, respectively, while the corresponding calculations for a 21% fall in renal measurements were 54% sensitivity and 90% specificity. When arrhythmia developed, NIRS values fell simultaneously, while the development of a desaturation problem was heralded by NIRS falling 10-15?s earlier than changes in pulse oxymetry; on improving saturation, NIRS returned to earlier values 10-15?s before pulse oxymetry readings. NIRS monitoring may provide an early warning with regard to complications likely to develop during a procedure. A fall of 9% in cranial NIRS values, or of 21% in renal measurements, should raise clinician awareness. PMID:24404951

Tanidir, Ibrahim Cansaran; Ozturk, Erkut; Ozyilmaz, Isa; Saygi, Murat; Kiplapinar, Neslihan; Haydin, Sertac; Guzeltas, Alper; Odemis, Ender

2014-10-01

110

Technique and indications of percutaneous cholecystostomy in the management of cholecystitis in 2014.  

PubMed

The gold standard in treatment of acute cholecystitis is cholecystectomy associated with antibiotics. In certain circumstances, percutaneous cholecystostomy is an interventional alternative. Percutaneous cholecystostomy is usually performed under local anesthesia by the radiologist using ultrasonographic or CT guidance. A drain can be inserted either through a trans-hepatic or a trans-peritoneal approach. Complications occur in nearly 10% of cases including hemorrhage, hemobilia, pneumothorax or bile leaks, depending on whether the approach was trans-hepatic or trans-peritoneal. The main indications for percutaneous cholecystostomy are resistance to medical treatment or severely-ill patients in intensive care. Drains should be maintained 3 to 6 weeks before removal. In patients with good general condition (ASA score I-II), secondary cholecystectomy can be recommended to avoid recurrence. PMID:25168577

Venara, A; Carretier, V; Lebigot, J; Lermite, E

2014-12-01

111

Irrigation Management with Remote Sensing Techniques. Crop Water Requirements and Biophysical Indicators  

NASA Astrophysics Data System (ADS)

Saving water in irrigated agriculture is increasingly relevant, as the irrigation sector is in many regions the biggest water consumer, but must be a sustainable activity. Therefore, the need urges for water use control methods and water resources planning. In irrigated agriculture, the right way for saving water is constituted by the increase of efficiency in water management. This work validates procedures and methodologies with remote sensing to determine the water availability in the soil at each moment and therefore the opportunity for the application of the water volume strictly necessary to optimize crop growth (irrigation opportunity and irrigation amount). The analysis applied to the Irrigation District of Divor, Évora, having used 7 experiment plots, which are areas watered by center-pivot systems, cultivated to corn. Data were determined from multispectral and infrared images of the cultivated surface obtained by satellite or by flying unmanned platform and integrated with parameters of the atmosphere and of the crops for calculating biophysical indicators and indices of water stress in the vegetation (NDVI, Kc, Kcb, CWSI). Therefore, evapotranspiration (ETc) was estimated, with which crop water requirement was calculated, with the opportunity and the amount of irrigation water to allocate. As this information is geographic referenced, maps can be prepared with GIS technology, describing water situation and the opportunity for watering crops. If the remote images are available with enough high spatial and temporal resolution, the frequent availability of maps can serve as a basis for a farmers irrigation advice system and for the regional irrigation authority to make decisions on the irrigation management at the regional scale. This can be a significant contribute to an efficient water management technology and a sustainable irrigated agriculture. Key-Words: Remote Sensing, Vegetation Index, Crop Coefficients, Water Balance

Toureiro, Célia; Serralheiro, Ricardo

2013-04-01

112

Experience of stenting for atherosclerotic renal artery stenosis in a cardiac catheterization laboratory: Technical considerations and complications  

PubMed Central

BACKGROUND Atherosclerotic renal artery (RA) stenosis contributes to hypertension, renal insufficiency and end stage renal disease, and is independently associated with adverse cardiovascular events. Percutaneous renal intervention is efficacious in treating renovascular hypertension and may be effective in stabilizing or improving renal function, thereby reducing cardiovascular risk. However, high rates of procedural complications have been reported. OBJECTIVES To determine the nature and frequency of complications of percutaneous renal intervention using contemporary techniques and equipment in a high-volume cardiac catheterization laboratory. METHODS Consecutive patients undergoing attempted RA stenting for atherosclerotic RA stenosis in the cardiac catheterization laboratory at the Vancouver General Hospital (Vancouver, British Columbia) between June 2000 and March 2007 were enrolled in a prospective registry. Baseline clinical characteristics, procedural and technical information, and complications were recorded. RESULTS A total of 132 RAs were stented in 106 patients during 108 procedures. The procedural success rate was 100%, with no related death, myocardial infarction, nephrectomy or dialysis. Major complications included three pseudoaneurysms (2.8%) and acute deterioration in renal function in six patients (5.5%), although renal function returned to baseline in one patient at 12 months. CONCLUSIONS RA stenting can be successfully and safely performed using contemporary techniques, and the low complication rates described should be the minimum standard for contemporary trials evaluating RA stenting. PMID:19668788

Jokhi, Percy P; Ramanathan, Krishnan; Walsh, Simon; Fung, Anthony Y; Saw, Jacqueline; Fox, Rebecca S; Zalunardo, Nadia; Buller, Christopher E

2009-01-01

113

Deep brain stimulation and ablation for obsessive compulsive disorder: evolution of contemporary indications, targets and techniques.  

PubMed

Surgical therapy for treatment-resistant obsessive compulsive disorder (OCD) remains an effective option for well-selected patients managed within a multidisciplinary setting. Historically, lesions within the limbic system have been used to control both obsessive thoughts and repetitive compulsions associated with this disease. We discuss classical targets as well as contemporary neuromodulatory approaches that have been shown to provide symptomatic relief. Recently, deep brain stimulation (DBS) of the anterior limb of the internal capsule/ventral striatum received Conformité Européene (CE) mark and Food and Drug Administration (FDA) approvals for treatment of intractable OCD. Remarkably, this is the first such approval for neurosurgical intervention in a strictly psychiatric indication in modern times. This target is discussed in detail along with alternative targets currently being proposed. We close with a discussion of gamma knife capsulotomy, a modality with deep historical roots. Further directions in the surgical treatment of OCD will require better preoperative predictors of postoperative responses, optimal selection of individualized targets, and rigorous reporting of adverse events and standardized outcomes. To meet these challenges, centers must be equipped with a multidisciplinary team and patient-centered approach to ensure adequate screening and follow up of patients with this difficult-to-treat condition. PMID:24099662

Tierney, Travis S; Abd-El-Barr, Muhammad M; Stanford, Arielle D; Foote, Kelly D; Okun, Michael S

2014-06-01

114

Kinetic analysis of pulmonary neutrophil retention in vivo using the multiple-indicator-dilution technique.  

PubMed

Multiple-indicator-dilution experiments were performed in the lungs of 13 anesthetized dogs by simultaneous bolus injection of 111In-labeled neutrophils, 51Cr-labeled red blood cells, and Evans blue-labeled albumin. Concomitant counts of unlabeled neutrophils were similar in pulmonary artery and aortic blood samples, demonstrating a dynamic balance across the lungs in the physiological state. Outflow profiles of labeled neutrophils were analyzed on the basis of a recirculatory pharmacokinetic model of labeled albumin. The outflow profiles of the recovered neutrophils were composed of a throughput component of circulating neutrophils and a component of reversibly marginated neutrophils. They were interpreted by a model incorporating neutrophil margination (transfer coefficient = 0.195 +/- 0.081 s-1), rapid demargination (0.054 +/- 0.027 s-1), and transfer to a slow marginated pool (0.023 +/- 0.018 s-1). It will be interesting to apply the analysis in future studies aimed at determining whether it could be a useful research tool to investigate the interactions between the pulmonary endothelium and neutrophils in physiological and diseased states. PMID:12639849

Schwab, Andreas J; Salamand, Agnes; Merhi, Yahye; Simard, Andre; Dupuis, Jocelyn

2003-07-01

115

[To FIV or not to FIV: Will gestational surrogacy be an indication for assisted reproductive techniques?].  

PubMed

Gestational surrogacy covers three different and often mixed up situations. In the first case (that of full surrogacy), the surrogate mother carries and has the baby anonymously. The child has been conceived by artificial insemination with her own oocyte and the help of the financing father, who has legally recognised the child before birth. This constitutes surrogacy motherhood practice, which was condemned by a judgment of the French Court of Cassation, in 1991. In the second case (gestational surrogacy), the mother only carries an embryo conceived in vitro by the biological parents to whom she will give back the baby when he is born. The filiation tie between the child and his parents is thereby maintained, the surrogate mother's role being limited to that of gestation. In the third case, the surrogate mother carries an embryo, the result of in vitro fertilization of the oocytes of a donor and the father's sperm. From the moment that surrogacy is not at variance with any of our fundamental rights, we cannot but wish that, with the guarantee of a rigorous frame, it might become a medical indication for IVF, in precise circumstances of female infertility. PMID:16959522

Delaisi de Parseval, G

2006-09-01

116

Comparison of remote sensing techniques for measurements of aircraft emissions indices at airports  

NASA Astrophysics Data System (ADS)

The emission indices of aircraft engine exhausts were measured at airports non-intrusively by FTIR emission spectrometry at the engine nozzle exit as well as by FTIR absorption spectrometry and DOAS (Differential Optical Absorption Spectrometry) behind the aircraft. Two measurement campaigns were performed to compare these different measurement methods. A kerosene powered burner was operated in that way that the different methods were applied for the exhaust gas investigations during the same time and at nearly the same exhaust gas volume. The burner was built with a nozzle exit diameter of 37 cm and a power of about 150 kW. Fresh air was pumped into the burner tube by a fan. Calibration gases as pure CO and NO were added in different amounts to vary the concentration of these gases in the exhaust. The sampling probe of an intrusive measurement system was installed in the centre of the exhaust stream near the exhaust exit for measurements of these gases and CO2 as well as NO2, UHC, SO2 and O2. An APU (GTCP36-300) in a test bed was used in the same way. CO was mixed into the exhausts near the nozzle exit. The passive FTIR instrument was operated in the test bed using special noise and vibration isolation. The open-path instruments were installed at the chimney exit on the roof of the test bed building. The deviations between the different measurement methods were in the order of +/-10 up to +/-20 %.

Schaefer, Klaus P.; Jahn, Carsten; Sturm, Peter J.; Lechner, Bernhard; Bacher, Michael; Gostomczyk, Adam; Kabarowska, Barbara; Zalewski, Leszec; Dahl, Guenter

2004-02-01

117

Plasma fibronectin as an indicator of microvascular damage in diabetic patients. Rapid and sensitive evaluation by a radial immunodiffusion technique  

Microsoft Academic Search

Summary  Plasma fibronectin might be considered as an indicator of early and advanced microvascular damage in diabetic patients. We\\u000a have therefore studied plasma fibronectin, using a radial immunodiffusion technique (LC-Partigen® Fibronectin), in insulin-dependent\\u000a and non-insulin-dependent diabetic patients with and without microangiopathic and neurological complications, i.e. retinopathy,\\u000a nephropathy and autonomic and peripheral neuropathy. Steady and progressive increases of plasma fibronectin levels in

Sebastiano Bruno Solerte; Marisa Fioravanti; Ettore Ferrari

1987-01-01

118

Current and emerging robot-assisted endovascular catheterization technologies: a review.  

PubMed

Endovascular techniques have been embraced as a minimally-invasive treatment approach within different disciplines of interventional radiology and cardiology. The current practice of endovascular procedures, however, is limited by a number of factors including exposure to high doses of X-ray radiation, limited 3D imaging, and lack of contact force sensing from the endovascular tools and the vascular anatomy. More recently, advances in steerable catheters and development of master/slave robots have aimed to improve these practices by removing the operator from the radiation source and increasing the precision and stability of catheter motion with added degrees-of-freedom. Despite their increased application and a growing research interest in this area, many such systems have been designed without considering the natural manipulation skills and ergonomic preferences of the operators. Existing studies on tool interactions and natural manipulation skills of the operators are limited. In this manuscript, new technical developments in different aspects of robotic endovascular intervention including catheter instrumentation, intra-operative imaging and navigation techniques, as well as master/slave based robotic catheterization platforms are reviewed. We further address emerging trends and new research opportunities towards more widespread clinical acceptance of robotically assisted endovascular technologies. PMID:24281653

Rafii-Tari, Hedyeh; Payne, Christopher J; Yang, Guang-Zhong

2014-04-01

119

The effects of music intervention on anxiety in the patient waiting for cardiac catheterization  

Microsoft Academic Search

Background: Hospitalization causes anxiety for many patients. It increases when patients anticipate their turn for cardiac catheterization. Music therapy reduces the psychophysiologic effects of anxiety and stress through the relaxation response.Aim: To determine the effects of music therapy an anxiety, heart rate and arterial blood pressure in patients waiting for their scheduled cardiac catheterization.Methods: In a quasi-experimental, pretest-posttest design, 101

Wallace J. Hamel

2001-01-01

120

Suprapubic Bladder Aspiration or Urethral Catheterization: Which is More Painful in Uncircumcised Male Newborns?  

PubMed Central

Background: The aim was to compare the intensity of pain caused by suprapubic aspiration (SPA) and urethral catheterization for urine sampling in premature infants. Methods: A prospective randomized controlled design with 80 premature infants in Alzahra University Hospital, Isfahan, Iran was conducted. Premature newborns who needed urine samples for microbiologic analysis were randomly assigned into two groups: SPA group and urethral catheterization group. Newborn faces and upper parts of the body were videotaped during the study and the pain was assessed during urine collection using Premature Infant Pain Profile (PIPP) score. Furthermore, crying time compared between groups. Results: The mean crying time was significantly higher in SPA than urethral catheterization group (77 vs. 34.4 s) (P < 0.001). The PIPP score was significantly lower in urethral catheterization group (13.4) than SPA group (11.5) P < 0.001. The success rate of SPA was 53% compared with 71% success rate of urethral catheterization. Conclusions: SPA is more painful than urethral catheterization in premature male infants as assessed by PIPP score and is more likely leads to procedure failure. PMID:25317295

Badiee, Zohreh; Sadeghnia, Alireza; Zarean, Noushin

2014-01-01

121

Catheterization of Intestinal Loops in Ruminants Does Not Adversely Affect Loop Function  

PubMed Central

Catheterized intestinal loops may be a valuable model to elucidate key components of the host response to various treatments within the small intestine of ruminants. We examined whether catheterizing ileal loops in sheep affected the overall health of animals and intestinal function, whether a bacterial treatment could be introduced into the loops through the catheters, and whether broad-spectrum antibiotics could sterilize the loops. Escherichia coli cells transformed to express the GFP gene were introduced readily into the loops through the catheters, and GFP E. coli cells were localized within the injected loops. Catheterized loops, interspaces, and intact ileum exhibited no abnormalities in tissue appearance or electrical resistance. Expression of the IFN?, IL1?, IL4, IL6, IL12p40, IL18, TGF?1, and TNF? cytokine genes did not differ significantly among the intact ileum, catheterized loops, and interspaces, nor did the expression of the gene for inducible nitric oxide synthase. Broad-spectrum antibiotics administered during surgery did not sterilize the loops or interspaces and did not substantively change the composition of the microbiota. However, antibiotics reduced the overall number of bacterial cells within the loop and the relative abundance of community constituents. We concluded that catheterization of intestinal loops did not adversely affect health or loop function in sheep. Furthermore, allowing animals to recover fully from surgery and to clear pharmaceuticals will remove any confounding effects due to these factors, making catheterized intestinal loops a feasible model for studying host responses in ruminants. PMID:21262134

Inglis, G Douglas; Kastelic, John P; Uwiera, Richard R E

2010-01-01

122

Pharmacotherapy in the cardiac catheterization laboratory: evolution and recent developments  

PubMed Central

Many recent innovations have been made in developing new antiplatelet and anticoagulant drugs in the last few years, with a total of nine new antithrombotic drugs approved by the Food and Drug Administration after the year 2000. This has revolutionized the medical therapy given to manage acute coronary syndrome and support cardiac catheterization. The concept of dual antiplatelet therapy has been emphasized, and clopidogrel has emerged as the most-popular second antiplatelet drug after aspirin. Newer P2Y12 inhibitors like prasugrel and ticagrelor have been extensively studied and compared to clopidogrel. The role of glycoprotein (Gp) IIb/IIIa inhibitors is being redefined. Other alternatives to unfractionated heparin have become available, of which enoxaparin and bivalirudin have been studied the most. Apart from these, many more drugs with novel therapeutic targets are being studied and are currently under development. In this review, current evidence on these drugs is presented and analyzed in a way that would facilitate decision making for the clinician. For this analysis, various high-impact clinical trials, pharmacological studies, meta-analyses, and reviews were accessed through the MEDLINE database. Adopting a unique interdisciplinary approach, an attempt has been made to integrate pharmacological and clinical evidence to better understand and appreciate the pros and cons of each of these classes of drugs. PMID:25364258

Thind, Guramrinder S; Parida, Raunak; Gupta, Nishant

2014-01-01

123

Incidence and Predictors of Radial Artery Occlusion Associated Transradial Catheterization  

PubMed Central

In this study, we sought to assess the incidence and predictors of radial artery occlusion (RAO), which is a significant complication of transradial cardiac catheterization. We prospectively evaluated the results of 106 patients who underwent coronary angiography and percutaneous coronary intervention (PCI) via the transradial approach (TRA). At the 3rd h of intervention, the radial artery was checked by palpation; color doppler ultrasonography was performed at the 24th h. Fluoroscopy duration, procedure success, and complications of the radial artery were recorded. The procedure was successfully completed in all patients. RAO was detected in eight female and two male patients. In terms of RAO, there was a statistically significant difference between males and females (p=0.019). Other parameters did not show a significant correlation with RAO. Altough did not have any effect on procedural success, eight patients developed transient radial artery spasm. Gender was not associated with radial arterial spasms (p=0.19). TRA in the diagnosis and treatment of coronary artery disease has shown high procedural success and low complication rates; it addition, it presents a low economic burden. It should be used widely and be involved in the routine cardiology residency program. PMID:24151442

Tuncez, Abdullah; Kaya, Zeynettin; Aras, Dursun; Y?ld?z, Abdulkadir; Gül, Enes Elvin; Tekinalp, Mehmet; Karaka?, Mehmet Fatih; K?sac?k, Halil Lütfü

2013-01-01

124

A rapid and non-surgical procedure for jugular catheterization of pigs.  

PubMed

A rapid and non-surgical method for jugular catheterization in pigs was set up in 30 piglets of 6.2 kg, 23 pigs of 46 kg and 84 kg and two lactating multiparous sows. The animal was restrained on a V-shaped table (piglets) or with a rope around the mandible (slaughter pigs and sows). The vein was located with the Vacutainer system and a wire guide was inserted into the Vacutainer needle up to the vein lumen. When the needle was removed, the catheter was inserted over the wire guide and advanced until it penetrated the skin and thereafter, the vein wall. The catheter was fixed outside by a large tape and coiled inside a patch just behind the ears. The technique utilizes readily available material and is no more risky for the animal than a single blood sampling. Moreover, it can be performed within 15 to 20 min (including animal restraint) within pens. This new approach might have important implications not only for research purposes by facilitating repeated blood samplings but also for projects which require a rapid and easy method for testing of any kind of pharmaceutical or other type of products under husbandry conditions. PMID:10780845

Matte, J J

1999-07-01

125

Multispectral indices and advanced classification techniques to detect percent residue cover over agricultural crops using Landsat data  

NASA Astrophysics Data System (ADS)

Detecting and quantifying crop residue cover on agricultural fields is essential in identifying conservation tillage practices and estimating carbon sequestration, both of which are important goals within the Agricultural Policy Framework of Agriculture and Agri-Food Canada. Crop residue is traditionally measured using ground survey techniques such as the line-transect method or visual (drive-by) assessment but these techniques are tedious, time-consuming and subjective. With the increased number of advanced earth observation satellites, remote sensing has now become a viable option for mapping agricultural land management practices and percent crop residue cover. A wide variety of indices such as the Normalized Difference Index (NDI) and the Modified Soil Adjusted Crop Residue Index (MSACRI) were developed using multispectral data for this purpose but results have been mixed. Advanced classification techniques including linear spectral mixture analysis (SMA) and spectral angle mapper (SAM) provide an alternative to derive percent crop residue cover. Landsat-7 SLC-Off data were acquired over an agricultural study site in Eastern Ontario on May 25 2005. Simultaneous ground data were collected to characterize residue type, position, direction and percent cover. NDI, MSACRI, SMA and SAM were all computed and used to derive percent crop residue cover information. Preliminary results indicate that the SMA model predicts percent crop residue cover over agricultural fields with the most success, especially over fields of corn residue with an R2 value of 0.85 (RMSE of 12.46 and D of 0.99). However, further investigation is needed where residue models are validated against a larger dataset with greater variability in percent crop residue cover.

Pacheco, Anna; McNairn, Heather; Smith, Anne M.

2006-08-01

126

Technique to select the optimum modulation indices for suppression of undesired signals for simultaneous range and data operations  

NASA Technical Reports Server (NTRS)

An algorithm to search for the optimum set of modulation indices that will optimize a given simultaneous range/command/telemetry communications link is presented. This technique provides a way to suppress the ranging signal in order to limit performance degradation in the data channel due to interference from the ranging channel to a desired level, given a specified ranging accuracy. The link (when optimized) will (1) provide maximum available power to both the data and ranging channels for a specified degradation in the data channel so that it will transmit at the required data rate, (2) achieve a specified ranging accuracy over a maximum distance, under a certain set of conditions, and (3) provide adequate power for carrier tracking without degrading the data-channel thresholds. In addition, both data and ranging channels will fall below the threshold at the same point.

Nguyen, Tien Manh

1988-01-01

127

Learning-based modeling of endovascular navigation for collaborative robotic catheterization.  

PubMed

Despite rapid growth of robot assisted catheterization in recent years, most current platforms are based on master-slave designs with limited operator-robot collaborative control and automation. Under this setup, information concerning subject specific behavior and context-driven manoeuvre is not re-utilized for subsequent intervention. For endovascular catheterization, the robot itself is designed with little consideration of underlying skills and associated motion patterns. This paper proposes a learning-based approach for generating optimum motion trajectories from multiple demonstrations of a catheterization task such that it can be used for automating catheter motion within a collaborative setting. Motion models are generated from experienced manipulation of a catheterization procedure and replicated using a robotic catheter driver to assist inexperienced operators. Catheter tip motions of the automated approach are compared against the manual training sets for validating the proposed framework. The results show significant improvements in the quality of catheterization, which facilitate the design of hands-on collaborative robots that make full use of the natural skills of the operators. PMID:24579162

Rafii-Tari, Hedyeh; Liu, Jindong; Lee, Su-Lin; Bicknell, Colin; Yang, Guang-Zhong

2013-01-01

128

Safety of cardiac catheterization at a center specializing in the care of patients with pulmonary arterial hypertension  

PubMed Central

Abstract Cardiac catheterization is important for the management of patients with pulmonary arterial hypertension (PAH). It is used for diagnosis, assessment, and monitoring of PAH patients, as well as to perform interventions such as balloon atrial septostomy and coil embolization of collateral vessels. Although reports on the risks of catheterization in PAH patients are scarce, many centers hesitate to perform these procedures in such fragile patients. We performed a retrospective chart review of all cardiac catheterizations performed in PAH patients over 10 years at our pulmonary hypertension center. Demographic, hemodynamic, and outcome data were collected. Complication rates were determined, and multivariate proportional hazards modeling was performed to identify predictors of catheterization-related complications. There were 1,637 catheterizations performed in 607 patients over 10 years. Pediatric patients accounted for 50% of these cases, 48% were performed in patients with idiopathic PAH, and 49% were performed under general anesthesia. While the overall complication rate was 5.7%, the rate of major complications was only 1.2% (). Although there were 8 deaths during the admission following catheterization, only 4 of these were related to the procedure, yielding a catheterization-related mortality of 0.2%. In conclusion, when performed at a pulmonary hypertension center with expertise in the care of PAH patients, cardiac catheterization is associated with low complication rates and mortality, and it should remain an important tool in the management of these patients. PMID:25006398

2013-01-01

129

A novel radiocarbon dating technique applied to an ice core from the Alps indicating late Pleistocene ages  

NASA Astrophysics Data System (ADS)

Ice cores retrieved from high-altitude glaciers are important archives of past climatic and atmospheric conditions in midlatitude and tropical regions. Because of the specific flow behavior of ice, their age-depth relationship is nonlinear, preventing the application of common dating methods such as annual layer counting in the deepest and oldest part. Here we present a new approach and technique, allowing dating of any such ice core at arbitrary depth for the age range between ˜500 years B.P. and the late Pleistocene. This new, complementary dating tool has great potential for numerous ice core related paleoclimate studies since it allows improvement and extension of existing and future chronologies. Using small to ultrasmall sample size (100 ?g > carbon content > 5 ?g) accelerator mass spectrometry, we take advantage of the ice-included, water-insoluble organic carbon fraction of carbonaceous aerosols for radiocarbon (14C) dating. Analysis and dating of the bottom ice of the Colle Gnifetti glacier (Swiss-Italian Alps, 45°55'50?N, 7°52'33?E, 4455 m asl) has been successful in a first application, and the results revealed the core to cover most of the Holocene at the least with indication for late Pleistocene ice present at the very bottom.

Jenk, Theo M.; Szidat, SöNke; Bolius, David; Sigl, Michael; GäGgeler, Heinz W.; Wacker, Lukas; Ruff, Matthias; Barbante, Carlo; Boutron, Claude F.; Schwikowski, Margit

2009-07-01

130

Radiation Dose Reduction during Radial Cardiac Catheterization: Evaluation of a Dedicated Radial Angiography Absorption Shielding Drape  

PubMed Central

Objectives. Radiation scatter protection shield drapes have been designed with the goal of decreasing radiation dose to the operators during transfemoral catheterization. We sought to investigate the impact on operator radiation exposure of various shielding drapes specifically designed for the radial approach. Background. Radial access for cardiac catheterization has increased due to improved patient comfort and decreased bleeding complications. There are concerns for increased radiation exposure to patients and operators. Methods. Radiation doses to a simulated operator were measured with a RadCal Dosimeter in the cardiac catheterization laboratory. The mock patient was a 97.5?kg fission product phantom. Three lead-free drape designs were studied. The drapes were placed just proximal to the right wrist and extended medially to phantom's trunk. Simulated diagnostic coronary angiography included 6 minutes of fluoroscopy time and 32 seconds of cineangiography time at 4 standard angulated views (8?s each), both 15?frames/s. ANOVA with Bonferroni correction was used for statistical analysis. Results. All drape designs led to substantial reductions in operator radiation exposure compared to control (P < 0.0001). The greatest decrease in radiation exposure (72%) was with the L-shaped design. Conclusions. Dedicated radial shielding drapes decrease radiation exposure to the operator by up to 72% during simulated cardiac catheterization. PMID:22988525

Ertel, Andrew; Nadelson, Jeffrey; Shroff, Adhir R.; Sweis, Ranya; Ferrera, Dean; Vidovich, Mladen I.

2012-01-01

131

Effect of cranberry juice on bacteriuria in children with neurogenic bladder receiving intermittent catheterization  

Microsoft Academic Search

Objective: To determine the effect of cranberry prophylaxis on rates of bacteriuria and symptomatic urinary tract infection in children with neurogenic bladder receiving clean intermittent catheterization. Design: Double-blind, placebo-controlled, crossover study of 15 children receiving cranberry concentrate or placebo concentrate for 6 months (3 months receiving one concentrate, followed by 3 months of the other). Weekly home visits were made.

Theresa A. Schlager; Susan Anderson; Julie Trudell; Joseph O. Hendley

1999-01-01

132

History of Right Heart Catheterization: 100 Years of Experimentation and Methodology Development  

PubMed Central

The development of right heart catheterization has provided the clinician the ability to diagnose patients with congenital and acquired right heart disease, and to monitor patients in the ICU with significant cardiovascular illnesses. The development of bedside pulmonary artery catheterization has become a standard of care for the critically ill patient since its introduction into the ICU almost 40 years ago. However, adoption of this procedure into the mainstream of clinical practice occurred without prior evaluation or demonstration of its clinical or cost-effectiveness. Moreover, current randomized, controlled trials provide little evidence in support of the clinical utility of pulmonary artery catheterization in the management of critically ill patients. Nevertheless, the right heart catheter is an important diagnostic tool to assist the clinician in the diagnosis of congenital heart disease and acquired right heart disease, and moreover, when catheter placement is proximal to the right auricle (atria), this catheter provides an important and safe route for administration of fluids, medications, and parenteral nutrition. The purpose of this manuscript is to review the development of right heart catheterization that led to the ability to conduct physiologic studies in cardiovascular dynamics in normal individuals and in patients with cardiovascular diseases, and to review current controversies of the extension of the right heart catheter, the pulmonary artery catheter. PMID:20160536

Nossaman, Bobby D.; Scruggs, Brittni A.; Nossaman, Vaughn E.; Murthy, Subramanyam N.; Kadowitz, Philip J.

2010-01-01

133

Comparison of Two Relaxation Techniques to Reduce Physiological Indices of Anxiety in a Person with Mild Mental Retardation.  

E-print Network

??Occupational therapists play an important role in improving the occupational performance of persons with mental retardation. Relaxation techniques are a preparatory activity used by occupational… (more)

Kenner, Courtney

2009-01-01

134

Indicator dilution time-activity curves demonstrated by rapid magnetic resonance imaging techniques and paramagnetic contrast agent.  

PubMed

Indicator dilution time-activity curves are demonstrated using magnetic resonance imaging (MRI) as the detector and a paramagnetic contrast agent as the indicator. Manganese chloride was injected into a flow phantom. The nuclear magnetic resonance (MR) intensity was measured downstream. Several flow rates were used. The observed MR intensity decreased as the paramagnetic indicator passed through the imaging plane. The qualitative changes of the MR intensity decrease varied in accordance with indicator dilution theory. The equations for gradient refocused echoes, paramagnetic compound relaxation changes, and the indicator dilution analysis were combined and evaluated. Quantitative analysis demonstrates several problems in its implementation. PMID:2663765

Davis, P L; Wolf, G L; Gillen, J S

1989-05-01

135

Application of spectrophotometric, densitometric, and HPLC techniques as stability indicating methods for determination of Zaleplon in pharmaceutical preparations  

NASA Astrophysics Data System (ADS)

Spectrophotometric, spectrodensitometric and HPLC are stability indicating methods described for determination of Zaleplon in pure and dosage forms. As Zaleplon is easily degradable, the proposed techniques in this manuscript are adopted for its determination in presence of its alkaline degradation product, namely N-[4-(3-cyano-pyrazolo[1,5a]pyridin-7-yl)-phenyl]- N-ethyl-acetamide. These approaches are successfully applied to quantify Zaleplon using the information included in the absorption spectra of appropriate solutions. The second derivative (D 2) spectrophotometric method, allows determination of Zaleplon without interference of its degradate at 235.2 nm using 0.01N HCl as a solvent with obedience to Beer's law over a concentration range of 1-10 ?g ml -1 with mean percentage recovery 100.24 ± 0.86%. The first derivative of the ratio spectra ( 1DD) based on the simultaneous use of ( 1DD) and measurement at 241.8 nm using the same solvent and over the same concentration range as (D 2) spectrophotometric method, with mean percentage recovery 99.9 ± 1.07%. The spectrodensitometric analysis allows the separation and quantitation of Zaleplon from its degradate on silica gel plates using chloroform:acetone:ammonia solution (9:1:0.2 by volume) as a mobile phase. This method depends on quantitave densitometric evaluation of thin layer chromatogram of Zaleplon at 338 nm over a concentration range of 0.2-1 ?g band -1, with mean percentage recovery 99.73 ± 1.35. Also a reversed-phase liquid chromatographic method using 5-C8 (22 cm × 4.6 mm i.d. 5 ?m particle size) column was described and validated for quantitation of Zaleplon using acetonitrile:deionised water (35:65, v/v) as a mobile phase using Paracetamol as internal standard and a flow rate of 1.5 ml min -1 with UV detection of the effluent at 232 nm at ambient temperature over a concentration range of 2-20 ?g ml -1 with mean percentage recovery 100.19 ± 1.15%. The insignificance difference of the proposed methods results with those of the reference one proved their accuracy and precision.

Metwally, Fadia H.; Abdelkawy, M.; Abdelwahab, Nada S.

2007-12-01

136

Optimal use of left ventriculography at the time of cardiac catheterization: A consensus statement from the society for cardiovascular angiography and interventions.  

PubMed

The rationale to perform left ventriculography at the time of cardiac catheterization has been little studied. The technique and frequency of use of left ventriculography vary by geographic regions, institutions, and individuals. Despite the recent publication of guidelines and appropriate use criteria for coronary angiography, revascularization, and noninvasive imaging, to date there have been no specific guidelines on the performance of left ventriculography. When left ventriculography is performed, proper technique must be used to generate high quality data which can direct patient management. The decision to perform left ventriculography in place of, or in addition to, other forms of ventricular assessment should be made taking into account the clinical context and the type of information each study provides. This paper attempts to show the role of left ventriculography at the time of coronary angiography or left heart catheterization. The recommendations in this document are not formal guidelines but are based on the consensus of this writing group. These recommendations should be tested through clinical research studies. Until such studies are performed, the writing group believes that adoption of these recommendations will lead to a more standardized application of ventriculography and improve the quality of care provided to cardiac patients. © 2014 Wiley Periodicals, Inc. PMID:25370476

Gigliotti, Osvaldo S; Babb, Joseph D; Dieter, Robert S; Feldman, Dmitriy N; Islam, Ashequl M; Marmagkiolis, Konstantinos; Moore, Phillip; Sorajja, Paul; Blankenship, James C

2014-11-01

137

Effectiveness and safety of transradial artery access for cardiac catheterization  

PubMed Central

The transradial approach for coronary angiography and angioplasty, while not new, is gaining momentum again as a viable alternative to the transfemoral approach. While technically it may have some challenges, there are significant benefits including reduced patient discomfort, improved time to ambulation, reduction in costs, and reduction in potentially life-threatening complications. The technique is not difficult to learn, and the equipment is similar to that used in more traditional approaches. To expand awareness of this method, this article discusses the history of the technique, reviews the data comparing it to the more widely used transfemoral technique, and discusses some of the experience at Baylor University Medical Center at Dallas, where this approach has been gaining popularity. PMID:21738292

2011-01-01

138

COMPLEMENTARY IMAGING OF GRANULAR Co-Ag FILMS WITH MAGNETO-OPTICAL INDICATOR FILM TECHNIQUE AND MAGNETIC  

E-print Network

AND MAGNETIC FORCE MICROSCOPY M.J. Donahue, L.H. Bennett, R.D. McMichael, L.J. Swartzendruber, A.J. Shapiro) technique and magnetic force microscopy were used for visualization and direct real-time experimental study magnetic multilayers [8]. We also illustrate the use of magnetic force microscopy (MFM) as a complementary

Donahue, Michael J.

139

Spectrophotometric Determination of the Dissociation Constant of an Acid-Base Indicator Using a Mathematical Deconvolution Technique  

ERIC Educational Resources Information Center

A laboratory experiment reinforces the concept of acid-base equilibria while introducing a common application of spectrophotometry and can easily be completed within a standard four-hour laboratory period. It provides students with an opportunity to use advanced data analysis techniques like data smoothing and spectral deconvolution to…

Alter, Krystyn P.; Molloy, John L.; Niemeyer, Emily D.

2005-01-01

140

N-acetyl cysteine reduces chromosomal DNA damage in circulating lymphocytes during cardiac catheterization procedures: A pilot study  

Microsoft Academic Search

BackgroundN-acetylcysteine (NAC) is considered a promising radio-protector for its antioxidant and anticarcinogenic properties. We examined the ability of NAC to confer protection against radiation-induced chromosomal DNA damage during cardiac catheterization procedures.

Maria Grazia Andreassi; Angelo Cioppa; Samantha Manfredi; Maria Giovanna Neri; Ilenia Foffa; Eugenio Picano

141

[Spiral x-ray computed tomography in the diagnosis of central venous catheterization complications].  

PubMed

In this work we report our initial experience on the utilisation of the spiral tomodensitometry in the study of the vascular complications due to the catheterization of the internal jugular vein. We present the results of a systematic search of vascular lesions after removal of an indwelling catheter in a group of 18 patients and describe a few cases of acute complications where the use of TDMS has been very useful in the diagnostic workout. The results confirm the risks associated with the catheterization of the internal jugular vein, showing a frequency of lesions of various degree in about 50% of the cases. Moreover, we discuss some aspects of the thrombotic complications in the patients carrying a central venous catheter and the advantages of the diagnostic application of the spiral tomodensitometry. PMID:11811017

Forneris, G; Quarello, F; Pozzato, M; Vaudano, G P

2001-01-01

142

Right subclavian vein catheterism complication due to a 'foreign body': a case report  

PubMed Central

Introduction Central venous access devices are widely used in hospital practice. Complications associated with their use are well described and reviewed. In this paper, we report a former complication that in turn created a new complication during a standardized procedure. Case presentation We report the case of an 81-year-old Caucasian woman requiring total parenteral nutrition due to a high-debt enterocutaneous fistula. In a previous right subclavian catheterization a fragmentation of the tip of the catheter, probably not recognized at the time, provoked an extrinsic compression of the vessel. Conclusion Fragmentation of a central venous catheter is a possible complication of catheterization and can be missed. Control of a catheter is imperative after its removal, even if not always practiced. PMID:20958959

2010-01-01

143

Pseudoaneurysm a rare complication of transradial cardiac catheterization: a case report.  

PubMed

Transradial access for cardiac catheterization is a safe and viable approach with significantly lower incidence of major access-related complications compared with the transfemoral approach. As this form of access is getting wider acceptance among interventional cardiologists, awareness of its complications is of vital importance. Asymptomatic radial artery occlusion, non-occlusive radial artery injury and radial artery spasm are commonly reported complication of this approach. Symptomatic radial arterial occlusion, pseudoaneurysm and radial artery perforation are rarely reported complications of transradial approach. Early identification of these uncommon complications and their urgent management is of significant importance. We present the case of an 80-year-old lady who developed pseudoaneurysm a week after transradial cardiac catheterization managed with surgical excision with no long-term sequela. PMID:23508390

Bhat, Tariq; Bhat, Hilal; Teli, Sumaya; Rajiv, Bartaula; Akhtar, Muhammad; Gala, Bhavesh

2013-03-18

144

Transcervical artificial insemination in dogs and cats: review of the technique and practical aspects.  

PubMed

The technique of transcervical catheterization for artificial insemination has gained practical importance over the last 3 and 1 decades in bitches and queens, respectively. The vagina of both species has a thickening of the dorsal aspect called dorsal medial fold, which restricts the lumen of the paracervix, making catheterization of the cervix difficult both with manual and endoscopic techniques. Manual catheters have been used initially in the bitch and are now gradually being replaced by rigid endoscopy through the adaptation of human cystoscopes and ureteroscopes. Cystoscopes provide excellent imaging of the vagina, but cervical catheterization is more difficult due to the oblique 30° viewing angle of its telescope and may not be long enough to catheterize large size bitches. Ureteroscopes allow an acceptable view of the vaginal mucosa and offer advantages such as the possibility to catheterize the cervix of bitches of all body sizes, manipulate the cervical tubercle when the external cervical os is not visible, offer a better visualization of the cervix using the shunt (a large Foley catheter which allows insufflation and distention of the vagina). Feline cervical catheterization has been achieved with three different types of catheters; the last one, developed following careful anatomical studies of how the feline vaginal lumen changes during estrus, allows cervical catheterization thanks to digital manipulation of the cervix through the rectum. PMID:25277433

Romagnoli, S; Lopate, C

2014-10-01

145

Urethrogluteal fistula developing secondary to the use of clean intermittent self-catheterization: first case report in the literature.  

PubMed

Clean intermittent self-catheterization is the standard method for bladder evacuation in these patients today. The patient was diagnosed with urethrogluteal fistula and gluteal-perineal abscess by radiological evaluation. Gluteal drainage decreased after cystostomy. In our paper, a case of urethrogluteal fistula and pelvic urinoma that developed as a result of the use of clean intermittent self-catheterization (CISC), which is rarely found in the literature, is presented. PMID:25349769

Bozkurt, Aliseydi; Karabakan, Mehmet; Soyturk, Mehmet; Hirik, Erkan; Nuhoglu, Bar??

2014-01-01

146

Urethrogluteal Fistula Developing Secondary to the Use of Clean Intermittent Self-Catheterization: First Case Report in the Literature  

PubMed Central

Clean intermittent self-catheterization is the standard method for bladder evacuation in these patients today. The patient was diagnosed with urethrogluteal fistula and gluteal-perineal abscess by radiological evaluation. Gluteal drainage decreased after cystostomy. In our paper, a case of urethrogluteal fistula and pelvic urinoma that developed as a result of the use of clean intermittent self-catheterization (CISC), which is rarely found in the literature, is presented. PMID:25349769

Bozkurt, Aliseydi; Karabakan, Mehmet; Soyturk, Mehmet; Hirik, Erkan; Nuhoglu, Bar??

2014-01-01

147

Thrombus Formation After Percutaneous Catheterization and Manual Compression of the Femoral Artery in Heparinized Sheep  

SciTech Connect

The purpose of this study was to evaluate the angiographic and histopathologic changes in the superficial femoral artery (SFA) in heparinized sheep shortly after catheterization with an 8-Fr sheath and manual compression hemostasis either with standard manual compression (SMC) or with the use of a procoagulant chitosan-based HemCon Bandage. The evaluation was done in 38 SFAs of 19 heparinized (100 mg/kg) sheep. After a 5-min catheterization with an 8-Fr sheath, a 5-min compression was applied. Follow-up angiograms to evaluate hemostasis were done immediately after release of compression and then at 2.5-min intervals until no extravasation was present. Compression was reapplied between angiograms. Final angiograms were performed approximately 30 min after hemostasis and after 3 min of passive flexion and extension of sheep hind limbs. Sheep were then euthanized and SFA specimens with surrounding tissues excised for histopathologic evaluation. Both types of compression caused similar changes in the catheterized SFAs. Follow-up angiograms showed mild arterial narrowing in 14 SFAs and intraluminal clots in 9 SFAs. Histology revealed periarterial hematoma in all 38 specimens. Intraluminal thrombi consisting predominantly of platelets and fibrin were present in 32 SFAs. Their size varied from superficial elevations (8 arteries) to medium-sized, 1- to 2-mm, polypoid protrusions (15 arteries) to large polypoid clots, 3-4 mm long (9 arteries). In six SFAs, the arterial access sites were not included in the obtained specimens. In conclusion, hemostasis with manual compression is achieved in the acute phase by formation of a predominantly platelet-fibrin thrombus occluding the arterial wall access site and often extending significantly into the arterial lumen. The healing process of arterial access sites should be explored several days after catheterization.

Kim, Young Hwan; Pavcnik, Dusan, E-mail: pavcnikd@ohsu.edu; Kakizawa, Hideyaki; Uchida, Barry T. [Oregon Health Sciences University, Dotter Interventional Institute (United States); Burke, Allen [Armed Forces Institute of Pathology, Department of Genitourinary Pathology (United States); Loriaux, Marc [Oregon Health Sciences University, Department of Pathology (United States); Keller, Frederick S.; Rosch, Josef [Oregon Health Sciences University, Dotter Interventional Institute (United States)

2010-04-15

148

Effectiveness of enoxaparin for prevention of radial artery occlusion after transradial cardiac catheterization  

Microsoft Academic Search

The aim of this study was to assess the efficacy of enoxaparin for prevention of radial artery (RA) occlusion after transradial\\u000a access for diagnostic and interventional cardiac procedures. RA occlusion is a potential complication of transradial cardiac\\u000a catheterization. Conventionally, unfractionated heparin is used for prevention of RA occlusion. Effectiveness of low molecular\\u000a weight heparins for prevention of this complication has

Hasan Feray; Cemil Izgi; Diler Cetiner; Ebubekir Emre Men; Yelda Saltan; Ayhan Baltay; Reyhan Kahraman

2010-01-01

149

X-Ray Magnetic Resonance Fusion to Internal Markers and Utility in Congenital Heart Disease Catheterization  

PubMed Central

Background X-ray magnetic resonance fusion (XMRF) allows for use of 3D data during cardiac catheterization. However, to date, technical requirements have limited the use of this modality in clinical practice. We report on a new internal-marker XMRF method that we have developed and describe how we used XMRF during cardiac catheterization in congenital heart disease. Methods and Results XMRF was performed in a phantom and in 23 patients presenting for cardiac catheterization who also needed cardiac MRI for clinical reasons. The registration process was performed in <5 minutes per patient, with minimal radiation (0.004 to 0.024 mSv) and without contrast. Registration error was calculated in a phantom and in 8 patients using the maximum distance between angiographic and 3D model boundaries. In the phantom, the measured error in the anteroposterior projection had a mean of 1.15 mm (standard deviation, 0.73). The measured error in patients had a median of 2.15 mm (interquartile range, 1.65 to 2.56 mm). Internal markers included bones, airway, image artifact, calcifications, and the heart and vessel borders. The MRI data were used for road mapping in 17 of 23 (74%) cases and camera angle selection in 11 of 23 (48%) cases. Conclusions Internal marker–based registration can be performed quickly, with minimal radiation, without the need for contrast, and with clinically acceptable accuracy using commercially available software. We have also demonstrated several potential uses for XMRF in routine clinical practice. This modality has the potential to reduce radiation exposure and improve catheterization outcomes. PMID:21536785

Dori, Yoav; Sarmiento, Marily; Glatz, Andrew C.; Gillespie, Matthew J.; Jones, Virginia M.; Harris, Matthew A.; Whitehead, Kevin K.; Fogel, Mark A.; Rome, Jonathan J.

2012-01-01

150

Hierarchical HMM based learning of navigation primitives for cooperative robotic endovascular catheterization.  

PubMed

Despite increased use of remote-controlled steerable catheter navigation systems for endovascular intervention, most current designs are based on master configurations which tend to alter natural operator tool interactions. This introduces problems to both ergonomics and shared human-robot control. This paper proposes a novel cooperative robotic catheterization system based on learning-from-demonstration. By encoding the higher-level structure of a catheterization task as a sequence of primitive motions, we demonstrate how to achieve prospective learning for complex tasks whilst incorporating subject-specific variations. A hierarchical Hidden Markov Model is used to model each movement primitive as well as their sequential relationship. This model is applied to generation of motion sequences, recognition of operator input, and prediction of future movements for the robot. The framework is validated by comparing catheter tip motions against the manual approach, showing significant improvements in the quality of catheterization. The results motivate the design of collaborative robotic systems that are intuitive to use, while reducing the cognitive workload of the operator. PMID:25333155

Rafii-Tari, Hedyeh; Liu, Jindong; Payne, Christopher J; Bicknell, Colin; Yang, Guang-Zhong

2014-01-01

151

Catheter interventions in congenital heart disease without regular catheterization laboratory equipment: the chain of hope experience in Rwanda.  

PubMed

This report describes the feasibility and safety of cardiac catheterization in a developing country without access to a regular cardiac catheterization laboratory. The equipment used for imaging consisted of a monoplane conventional C-arm X-ray system and a portable ultrasound machine using the usual guidewires and catheters for cardiovascular access. In this study, 30 patients, including 17 children younger than 2 years and 2 adults, underwent catheterization of the following cardiac anomalies: patent ductus arteriosus (20 patients) and pulmonary valve stenosis (9 patients, including 2 patients with critical stenosis and 3 patients with a secundum atrial septal defect). Except for two cases requiring surgery, the patients were treated successfully without complications. They all were discharged from hospital, usually the day after cardiac catheterization, and showed significant clinical improvement in the follow-up evaluation. Cardiac catheterization can be performed safely and very effectively in a country with limited resources. If patients are well selected, this mode of treatment is possible without the support of a sophisticated catheterization laboratory. PMID:22644416

Senga, John; Rusingiza, Emmanuel; Mucumbitsi, Joseph; Binagwaho, Agnès; Suys, Bert; Lys, Christine; Carbonez, Karlien; Ovaert, Caroline; Sluysmans, Thierry

2013-01-01

152

The Use of MMF Screws: Surgical Technique, Indications, Contraindications, and Common Problems in Review of the Literature.  

PubMed

Mandibulo-maxillary fixation (MMF) screws are inserted into the bony base of both jaws in the process of fracture realignment and immobilisation. The screw heads act as anchor points to fasten wire loops or rubber bands connecting the mandible to the maxilla. Traditional interdental chain-linked wiring or arch bar techniques provide the anchorage by attached cleats, hooks, or eyelets. In comparison to these tooth-borne appliances MMF screws facilitate and shorten the way to achieve intermaxillary fixation considerably. In addition, MMF screws help to reduce the hazards of glove perforation and wire stick injuries. On the downside, MMF screws are attributed with the risk of tooth root damage and a lack of versatility beyond the pure maintenance of occlusion such as stabilizing loose teeth or splinting fragments of the alveolar process. The surgical technique of MMF screws as well as the pros and cons of the clinical application are reviewed. The adequate screw placement to prevent serious tooth root injuries is still an issue to rethink and modify conceptual guidelines. PMID:22110819

Cornelius, Carl-Peter; Ehrenfeld, Michael

2010-06-01

153

The Use of MMF Screws: Surgical Technique, Indications, Contraindications, and Common Problems in Review of the Literature  

PubMed Central

Mandibulo-maxillary fixation (MMF) screws are inserted into the bony base of both jaws in the process of fracture realignment and immobilisation. The screw heads act as anchor points to fasten wire loops or rubber bands connecting the mandible to the maxilla. Traditional interdental chain-linked wiring or arch bar techniques provide the anchorage by attached cleats, hooks, or eyelets. In comparison to these tooth-borne appliances MMF screws facilitate and shorten the way to achieve intermaxillary fixation considerably. In addition, MMF screws help to reduce the hazards of glove perforation and wire stick injuries. On the downside, MMF screws are attributed with the risk of tooth root damage and a lack of versatility beyond the pure maintenance of occlusion such as stabilizing loose teeth or splinting fragments of the alveolar process. The surgical technique of MMF screws as well as the pros and cons of the clinical application are reviewed. The adequate screw placement to prevent serious tooth root injuries is still an issue to rethink and modify conceptual guidelines. PMID:22110819

Cornelius, Carl-Peter; Ehrenfeld, Michael

2010-01-01

154

[Results of intermittent catheterization in neurogenic bladder in children and adolescents. 165 cases from 1976 to 1986].  

PubMed

Intermittent clean catheterization (CIC) has been proposed in 1975 for treatment of neurogenic bladder in children and tean-agers. We report herein the results of our experience from 1976 to 1986 with this method in a large number of patients with bladder dysfunction. 165 patients were included in this study (111 girls and 54 boys). 9 patients were lost for follow-up. Myelomeningocele was the cause of the neurogenic bladder in 132 cases. The effects on continence, upper tracts, and urinary tract infection are studied. Incontinence was managed by CIC in all 156 patients, with CIC alone (40 patients) or in association with oxybutynin (21 patients), enterocystoplasty, (20 patients), one method of increasing peripheral resistances (i.e. urethral lengthening, (8 patients), abdominal transposition of the urethra) (2 patients]. 40 very young children remain incontinent, 84 became continent; there were four technical failures, and an other method was used in 28 patients. Status of the upper urinary tracts was determined by IVP and cystography in 156 patients. IVP was normal in 123 cases (there was no change in 95%), and abnormal in 33 cases (there was improvement in 28 cases or no change in 3 cases). These data confirm those found in our previous study: this technique appears simple, harmless and effective for protection of the upper urinary tract and for control of urinary incontinence. PMID:3447765

Mollard, P; Basset, T; Gounot, E; Sol Hernandez, A; Viguier, J L

1987-01-01

155

Comparative imaging technologies in the cardiac catheterization laboratory.  

PubMed

Evaluation of digital technology in the cardiac cath lab has introduced a desire to extend these technologies into electronic storage capability. Cine film is the current standard for image archiving because it meets the most important requirements of superior resolution, long-term stability, universal viewing and single-patient unit record capabilities. The major limitations of film include serial viewing (versus random access) and its incompatibility with computer techniques, such as quantitative angiography. Manufacturers and vendors have introduced several archiving alternatives that address the limitations of film. These options currently require trade offs and/or compromises in image quality, longevity, cost and numerous other requirements. Investments in alternatives should be made after comprehensive review of the expected productivity gains, anticipated media, equipment and supporting service cost improvements and prospective technological enhancements. This article has introduced a number of the issues that should be considered in comparing archiving media. As technology evolves and standards are developed, this task will become easier. In the meantime, no system to date has been able to achieve the existing advantages of film while overcoming its limitations. PMID:10129576

Condit, P B

1993-01-01

156

Measuring urban sprawl on geospatial indices characterized by leap frog development using remote sensing and GIS techniques  

NASA Astrophysics Data System (ADS)

Characterizing urban sprawl using spatial measures requires a concise definition of what constitutes sprawling urban spatial patterns. This research attempts to study a measurement of defining sprawl by using leapfrog development index through remote sensing and GIS approach. The IKONOS pan-sharpened and SPOT-5 with 1 and 2.5 meter resolution were used and combined with Geographical information system (GIS) database to analyze the geospatial indicators using the leapfrog development index. Kuantan city has been selected as a study area to examine the leapfrog development based on land use pattern for year 2012. The findings show Kuantan has identified as non-sprawling cities with result from characterization in leapfrog development that has been tested. However, the gap between sprawl and non-sprawling was very low. It is anticipated this research will provide a new direction in sprawl nationally that address finding of sprawl at the atomic level and present a robust analytical approach for characterizing urban development in city scale at once promoting a city via GIS & Remote Sensing technology respectively towards Digital and Green cities.

Noor, N. M.; Asmawi, M. Z.; Rusni, N. A.

2014-02-01

157

Single Therapeutic Catheterization for Treatment of Late Diagnosed Native Coarctation of Aorta Using A Covered Stent  

PubMed Central

Here in we are reporting a 35-year-old pregnant, hypertensive woman with a strict descending aorta coarctation. She had two missing pregnancies which were complicated with hypertension, but which were not diagnosed for any pathologies before. We diagnosed coarctation of aorta, but however postponed her treatment after delivery of baby, because hypertension was under control with medical treatment and she had no complication. She had an uneventful delivery. MRI angiography revealed coarctation of aorta and it was successfully treated by using an endovascular covered stent during a single cardiac catheterization. Endovascular covered stent implantation is an easy, safe and effective method for treating coarctation of aorta in adults. PMID:24783116

Ural, Alper V; Caglar, Ilker Murat; Caglar, Fatma Nihan Turhan; Ciftci, Serkan; Karakaya, Osman

2014-01-01

158

Arterial Catheterization  

MedlinePLUS

... provide valuable information to adjust oxygen therapy or mechanical ventilator (respirator; breathing machine) settings. The blood oxygen ... nhlbi.nih.gov/index.htm Centers for Disease Control & Prevention: www.cdc.gov/ The ATS Patient Information ...

159

Thromboatheromatous complications of umbilical arterial catheterization in the newborn period. Clinicopathological study.  

PubMed Central

Severe catheter-related thromboatheromatous lesions were found at necropsy in 33 of 56 infants who had umbilical arterial catheters passed during life. In infants dying within 8 days of insertion of the catheter, varying degrees of thrombosis of the aorta and its major branches were seen. With increasing thrombosis and aging of the thrombus, fatty deposits were seen first within the thrombus, and then in the intima and media. In addition there was evidence of proliferation of medial smooth muscle cells and of disruption of the medial architecture below the thrombus, characterized by the presence of abundant mucopolysaccharide. In infants who survived longer, varying degrees of organization of the thrombus could be traced, leading eventually to raised fibrous plaques with lipid and occasionally calcification. The lesions in the older infants were similar in many respects to experimental thromboatheromatous lesions produced in rabbits, and to some lesions of artheroma occurring spontaneously in humans. A wide variety of embolic phenomena were found, with features suggesting asynchrony of embolic episodes. The presence of thrombotic lesions could not be related to birthweight, Apgar scores at 1 and 5 minutes, age at catheterization, duration of catheterization, underlying disease process, age at death or the presence of hypothermia, acidosis, or anomalies in coagulation tests. There is a need for less hazardous methods of monitoring arterial oxygen tension. Images FIG. 1 FIG. 2 FIG. 3 FIG. 4 FIG. 5 FIG. 6 FIG. 7 FIG. 8 FIG. 9 FIG. 10 FIG. 11 FIG. 12 FIG. 13 FIG. 14 PMID:1008579

Tyson, J E; deSa, D J; Moore, S

1976-01-01

160

Subcutaneous lidocaine delivered by jet-injector for pain control before IV catheterization in the ED: The patients' perception and preference  

Microsoft Academic Search

To evaluate patients' perceptions and preferences concerning pain control during intravenous (IV) catheterization, a sample of 50 adult patients received subcutaneous lidocaine (0.2 mL 1%) by jet injector, or no anesthetic with a sham injection before IV catheterization. Visual analog scale (VAS), pain intensity score (PIS), and adverse reactions were recorded. A significant difference existed in the scores of patients

David J. Peter; John P. Scott; Henry C. Watkins; Heidi E. Frasure

2002-01-01

161

A novel technique of using a thyristor driven pump as the final control element and flow indicator of a flow control loop.  

PubMed

In the present paper, design of a flow control loop using a thyristor driven pump as final control element has been described. In this technique, the load current of a thyristor driven pump motor has been utilized as a mass flow sensing parameter of a fluid passing through a pipeline. This thyristor driven pump has been utilized as a final control element of a flow control loop and the speed of the pump has been selected as the manipulated variable. The non-linearity between the thyristor input signal and pump output has been eliminated by using a modified PID control technique with inverse derivative control action. Thus without using any conventional flow meter and control valve only the thyristor driven pump has been utilized both as the final control element and flow indicating device by using the proposed technique. The whole system has been designed, fabricated and tested by using tap water as the flowing liquid through a pipe line. The experimental results along with the theoretical analysis are compared and reported in the paper. PMID:21489523

Bera, S C; Mandal, N; Sarkar, R

2011-07-01

162

Catheterization of the AbioCor implantable replacement heart: evaluation of the unique physiology created by the device.  

PubMed

We performed the 1st catheterization of an AbioCor implantable replacement heart, in a patient who had developed high right-sided pump pressures, to determine whether the high pressures were caused by graft kinking or obstruction. PMID:17041696

Delgado, Reynolds M; Nawar, Mohamad; Loghin, Catalin; Myers, Timothy J; Gregoric, Igor D; Pool, Toni; Scroggins, Nancy; Radovancevic, Branislav; Frazier, O H

2006-01-01

163

Elementary Physics Considerations Indicate an Elegant Construction Technique For the Pyramids At Giza. Our Information Indicates They and the Sphinx Were Engineered and Built Around BCE 2500, Not Earlier!  

NASA Astrophysics Data System (ADS)

Archimedes articulated an applied physics experience of many children who observe the upward movement of floating objects when they get into their "tubs." This same principle can effectively allow massive Egyptian construction blocks and obelisks to be elevated and erected. Platform bases at Giza were leveled by means of water channels that were cut into the rock. There is a canal behind the pyramids. The bathtub technique can elevate or transport the water-borne block (or obelisk) to sites involved, including the Sphinx temple. Water outflow from the barge locks (tubs) can erode Sphinx surrounds, without invoking 7000+ year-ago rainy weather. Our previously detailed account of how constellations, Canis Major, Phoenix, Leo can be detected at sites like America's Stonehenge, while they are below the local horizon, also indicates ancient Egyptians may have done likewise. Orion, or Leo the Sphinx could have been detected while they were in the "underground," around BCE 2500, in alignments otherwise requiring a date of BCE 1050.

Mc Leod, Roger D.; Mc Leod, David M.

2002-10-01

164

Intravesical foreign body as a result of self catheterization: case report.  

PubMed

Foreign bodies inside urinary tract are a relatively rare condition in our practice. There are several reports published and in most cases the reason for self insertion of an object was autoerotic stimulation or psychiatric illness. Self treatment by homemade instruments is a rarely seen scenario. A 62-year-old man presented to our department complaining of lower urinary tract symptoms. On examination, a foreign body was detected inside the urinary bladder. Urethral stricture was also detected for which the patient had been previously treated on several occasions. The patient stated that he had attempted self catheterization using a homemade catheter. He had succeeded in emptying his bladder; however, the catheter entered the bladder completely and was irretrievable to him. Sachse urethrotomy was performed following retrieval of the foreign body. No psychiatric illness was detected in our patient. The patient's postoperative course was uneventful. PMID:25509248

Grubiši?, Igor; Stimac, Goran; Pezelj, Ivan; Svaguša, Ivan; Katuši?, Josip; Spaji?, Borislav

2014-09-01

165

[2 cases of chylothorax caused by catheterization of left large venous trunks].  

PubMed

The authors present two cases of almost certain catheterization of the thoracic duct, by infusion catheters placed in the large veins at the base of the neck (once in the left internal jugular, once in the left subclavian). Their clinical manifestaztions are the existence of a rapidly progressive pleural effusion, apart from the abnormal course of the catheter. Removal of the catheter is sufficient to lead to the disappearance of the symptomatology, so that it is difficult to speak of an accident as such, but rather of an incident. These incidents could be avoided by systematic radiography from the time that the catheter is placed in position or the positioning of the latter under control by brilliance amplifier. PMID:5926

Piro, J; Sainty, J M; Deveze, J L; Fogliani, J

1975-01-01

166

[Estimation of radiation exposure and radiation risk for employees of a heart catheterization laboratory].  

PubMed

The staff at interventional radiological procedures is exposed to high levels of ionizing radiation. This applies especially to measures at cardiac catheterization laboratories. In this study the annual radiation exposure to the staff was estimated by measuring the dose rate under characteristic conditions. It could be shown that the resulting radiation exposure was strongly dependent on the radiation protection measures and is also dependent on the operation conditions of the x-ray-tube. The effective dose for the physician wearing a lead apron and thyroid shield was determined to about 1.7 mSv/a. Without a thyroid shield an effective dose of about 3.5 mSv/a resulted. This corresponds to approximately the natural background radiation of about 2.4 mSv/a in the Federal Republic of Germany. From the number of procedures performed we could derive an effective dose of approximately 1-2 microSv per application for the physician, averaged over all types of procedures. Further, it could be shown that the readings of the film badges, usually worn by the staff, underestimate the effective dose by approximately a factor of two. This is because the film badges do not include the contribution of the unshielded parts of the body to effective dose. From the estimated annual effective dose, a lifetime dose of 68 mSv was estimated for a 40-year working career. The corresponding lifetime risk for induced fatal cancer due to radiation exposure was determined to 0.3% applying the ICRP risk factor of 4 x 10(-2) Sv-1. Considering the NCRP recommendations for a safe occupation, working in a cardiac catheterization laboratory can be considered as safe when applying all radiation protection measures. However, changing the protection measures and modifying the parameters of the x-ray-tube can lead to strong changes of the radiation exposure and the resulting risk estimation. PMID:9235797

Folkerts, K H; Münz, A; Jung, S

1997-04-01

167

Trans-radial versus trans-femoral access in patients with end-stage liver disease undergoing cardiac catheterization  

PubMed Central

Cardiac catheterization has been increasingly utilized to evaluate coronary artery disease in patients with end stage liver disease (ESLD). It is known in other populations that radial access reduces access site complications;however, there is a paucity of data in ESLD patients. We investigated vascular and bleeding complications rates between trans-femoral and trans-radial cardiac catheterizations in this high risk population. In this retrospective cohort study, three hundred and thirty four ESLD patients were identified between August 2004 and December 2012 who had undergone trans-femoral (femoral group) or trans-radial (radial group) cardiac catheterizations at our institution. The radial group was not significantly different from the femoral group in age (p = 0.056), proportions of genders (p = 0.85), and weight (p = 0.19); however, compared to the femoral group, the radial group had significantly lower blood pressure (p < 0.0001), hemoglobin (10.4 ± 1.9 vs 11.1 ± 2.02 g/dL, p = 0.001), and hematocrit (30.3 ± 5.7% vs 32.6 ± 6.0%, p < 0.0006), and had a significantly higher INR (1.94 ± 1.16 vs 1.59 ± 0.62, p = 0.0001). In terms of vascular complications, the radial group had a significantly lower rate of pseudoaneurysms (0% vs 3.7%, p = 0.019) than the femoral group. While there were no bleeding complications in either group or differences in transfusion requirements, there was a significantly lower percentage drop in hematocrit in the radial group compared to the femoral group (5.4% vs 7.8%, p = 0.039). In conclusion, trans-radial catheterization is associated with lower rates of vascular access site complications compared to trans-femoral catheterization. PMID:25360391

Feng, Kent; Gupta, Vipul; Terrazas, Enrique; Yeghiazarians, Yerem; Ports, Thomas; Gregoratos, Gabriel; Tavakol, Mehdi; Roberts, John Paul; Boyle, Andrew

2014-01-01

168

“Outside-in” Technique, Clinical Results, and Indications with Transforaminal Lumbar Endoscopic Surgery: a Retrospective Study on 220 Patients on Applied Radiographic Classification of Foraminal Spinal Stenosis  

PubMed Central

Objective To analyze and describe appropriate surgical indications for endoscopically performed transforaminal decompression with the outside-in technique with foraminoplasty in patients with lateral stenosis with and without herniated disc. Background and Significance Endoscopic microdiscectomy is growing in popularity for the removal of lumbar disc herniations. Recent advances in surgical techniques allow for percutaneous endoscopically assisted bony decompression as well. Materials and Methods A retrospective study of 220 consecutive patients undergoing percutaneous endoscopic transforaminal foraminoplasty and microdiscectomy at 228 levels was conducted with intent of identifying appropriate surgical indications in patients with monoradiculopathy. The mean follow up was 46 months ranging from 26 to 54 months. Preoperatively, foraminal and lateral recess stenosis was graded on preoperative MRI and CT scans by dividing the lumbar neuroforamen into three zones: a) entry zone, b) middle zone, and c) exit zone. In addition, the presence of disc herniation causing neural element compression in the lateral recess and neuroforamen was noted. Disc herniations, if present, were recorded as either extruded and contained disc herniations. Surgical outcomes were classified according to the Macnab criteria. In addition, reductions in VAS scores were assessed. Results According to the Macnab criteria, excellent and good results were obtained in 85% (186/220) of patients with monoradiculopathy. The mean VAS score decreased from 7.5 ± 1.5 preoperatively to 2.8 ± 1.9 at the final follow-up (P < 0.01). Concomitant extruded disc herniations and contained disc bulges were recorded in 24 and 82 patients, respectively. There were no approach-related complications. Clinical failures occurred in patients with bony stenosis in the lateral recess and entry zone of the neuroforamen. Less favorable outcomes were observed in patients with concomitant contained disc herniations when compared to extruded disc herniations (P < 0.03) as well in patients older than 50 years of age (P < 0.021). Conclusions Percutaneous, endoscopic decompression using outside-in technique works well in patients with monoradiculopathy due to lateral stenosis in the mid and exit zone of the neuroforamen. Decompression in the entry zone maybe inadequate using the transforaminal outside-in approach. Future studies with greater statistical power should determine as to whether pain relief was achieved via microdiscectomy or foraminoplasty.

2014-01-01

169

DIAGNOSTIC CARDIAC CATHETERIZATION USING THE MEDRAD AVANTA FLUID MANAGEMENT SYSTEM AS COMPARED TO THE TRADITIONAL MANUAL INJECTION METHOD  

SciTech Connect

Nearly 4 million patient procedures performed annually in US cardiac catheterization laboratories utilize contrast media to achieve vessel opacification. The amount of contrast media used is variable and depends on the complexity of the procedure, the method of contrast delivery as well as the skill-level of the operator. Since the total amount of contrast used for each procedure can have both patient safety and economic implications, it is essential for cardiologists to have the ability to control contrast delivery such that optimal angiographic image quality is achieved using the least amount of contrast. Although the complication rate associated with cardiac catheterization remains low, the most common serious complication, contrast-induced nephropathy (CIN), is associated with poor prognosis and a high mortality rate. Numerous interventional strategies for preventing and reducing the severity of CIN have demonstrated varying degrees of clinical benefit, but none has been shown to reliably prevent this serious complication. To date, the most effective approach for reducing the risk of CIN is to properly hydrate the patient and to minimize the amount of contrast media administered. Automated injection systems are intended for use in virtually all cardiac catheterization procedures and have numerous features which can provide potential advantages over traditional methods. With automated injection technology the operator is able to control and precisely monitor contrast delivery. Additionally, the MEDRAD Avanta Fluid Management Injection System utilizes a sterile contrast reservoir which eliminates the need to discard unused contrast in individual opened containers following each procedure. Considering that an average of 50% of opened contrast media is wasted using manual injection methods, this savings can provide a substantial economic benefit. Automated systems also facilitate the use of smaller (5 French) catheter sizes. Precise flow control and the use of smaller diameter catheters have both been shown to reduce the volume of contrast administered. The use of smaller size catheters also permits more rapid hemostasis, thus allowing shorter ambulation time without the need for costly wound closure devices. These factors can result in enhanced patient satisfaction as well as more efficient management of post-procedure rooms. The intent of this study was to demonstrate that using the MEDRAD Avanta Fluid Management Injection System (MEDRAD, INC., Pittsburgh, PA) for coronary diagnostic procedures can produce a reduction in the volume of contrast administered without loss of operational quality or efficiency. In addition, this study will explore procedure time and efficiency in an effort to minimize the amount of ionizing radiation delivered to the patient as well as the diagnostic team members. Study Design This is a post-market study designed to collect data during diagnostic cardiac catheterization when utilizing 5FR or 6FR catheters in conjunction with the Avanta Fluid Management System or a manual manifold injection method control group. A minimum of 420 patients scheduled for diagnostic cardiac catheterization will be enrolled in the study cohort. Patients will be assigned into the following two groups. Group 1: Catheterization with 5FR or 6FR catheters, using the traditional manual manifold injection method for contrast media delivery which is defined as manual hand injection of contrast media through a 3 or 4 port manifold and left ventriculography performed via standard fixed rate power injection. Group 2: Catheterization with 5FR or 6FR catheters, using the MEDRAD Avanta system for contrast media delivery. Study endpoints include volume of contrast media administered during diagnostic cardiac catheterization, volume of contrast media wasted post-procedure, procedure time (defined as the time from first catheter insertion to last diagnostic catheter removal), fluoroscopy time and angiographic image quality. The study demonstrated that use of the Advanta system reduced overall contrast utilization by decreasing th

Winniford, Michael D

2013-02-08

170

Intermittent self-catheterization and the risk of squamous cell cancer of the bladder: An emerging clinical entity?  

PubMed Central

There are only 7 cases reported in the literature of squamous cell cancer of the bladder in patients performing intermittent self-catheterization (ISC). We report on an eighth case, and the first case described in a patient with a Mitrofanoff continent appendicovesicostomy. A description of the case and review of the literature are presented. Risk factors for squamous cell cancer include recurrent urinary tract infections, keratinising squamous metaplasia (leukoplakia) and local mucosal trauma from intermittent self-catheterization. There is no recognized or validated monitoring program for patients performing ISC who may also have these risk factors. Reasonable protocols may include regular urinary cytology and cystoscopy with random or targeted bladder biopsies. Squamous cell cancer may present late in this cohort of patients and is associated with a dismal prognosis. PMID:19829719

Casey, Rowan G.; Cullen, Ivor M.; Crotty, Tom; Quinlan, David M.

2009-01-01

171

A National Clinical Quality Program for Veterans Affairs Catheterization Laboratories (from the Veterans Affairs Clinical Assessment, Reporting, and Tracking Program).  

PubMed

A "learning health care system", as outlined in a recent Institute of Medicine report, harnesses real-time clinical data to continuously measure and improve clinical care. However, most current efforts to understand and improve the quality of care rely on retrospective chart abstractions complied long after the provision of clinical care. To align more closely with the goals of a learning health care system, we present the novel design and initial results of the Veterans Affairs (VA) Clinical Assessment, Reporting, and Tracking (CART) program-a national clinical quality program for VA cardiac catheterization laboratories that harnesses real-time clinical data to support clinical care and quality-monitoring efforts. Integrated within the VA electronic health record, the CART program uses a specialized software platform to collect real-time patient and procedural data for all VA patients undergoing coronary procedures in VA catheterization laboratories. The program began in 2005 and currently contains data on 434,967 catheterization laboratory procedures, including 272,097 coronary angiograms and 86,481 percutaneous coronary interventions, performed by 801 clinicians on 246,967 patients. We present the initial data from the CART program and describe 3 quality-monitoring programs that use its unique characteristics-procedural and complications feedback to individual labs, coronary device surveillance, and major adverse event peer review. The VA CART program is a novel approach to electronic health record design that supports clinical care, quality, and safety in VA catheterization laboratories. Its approach holds promise in achieving the goals of a learning health care system. PMID:25439452

Maddox, Thomas M; Plomondon, Mary E; Petrich, Megan; Tsai, Thomas T; Gethoffer, Hans; Noonan, Gregory; Gillespie, Brian; Box, Tamara; Fihn, Stephen D; Jesse, Robert L; Rumsfeld, John S

2014-12-01

172

Cancer mortality following cardiac catheterization: a preliminary follow-up study on 4,891 irradiated children  

SciTech Connect

A retrospective cohort study was conducted on the risk of radiation-induced cancer mortality following cardiac catheterization. The study included 4,891 children with congenital heart disease who were assessed by cardiac catheterization during 1946 to 1968 at The Hospital for Sick Children, Toronto. The cohort was matched against the Ontario cancer death file from 1950 to 1975. The average period of follow-up was 13 years and more than 66,000 person-years have been accrued from the cohort. No deaths from breast cancer or thyroid cancer were identified. Five cancer deaths were observed and compared with 4.8 expected deaths based on Ontario cancer death rates. The five cancer deaths resulted from three leukemias, one Wilms' tumor, and one unspecified nervous system tumor. The preliminary findings did not demonstrate a significant leukemia risk arising from diagnostic cardiac catheterizations. Continued follow-up of this cohort is required to evaluate the risk of breast and thyroid cancers which can occur more than 20 years following radiation exposure.

Spengler, R.F.; Cook, D.H.; Clarke, E.A.; Olley, P.M.; Newman, A.M.

1983-02-01

173

Cancer mortality following cardiac catheterization: a preliminary follow-up study on 4,891 irradiated children  

SciTech Connect

A retrospective cohort study was conducted on the risk of radiation-induced cancer mortality following cardiac catheterization. The study included 4,891 children with congenital heart disease who were assessed by cardiac catheterization during 1946 to 1968 at The Hospital for Sick Children, Toronto. The cohort was matched against the Ontario cancer death file from 1950 to 1975. The average period of follow-up was 13 years and more than 66,000 person-years have been accrued from the cohort. No deaths from breast cancer or thyroid cancer were identified. Five cancer deaths were observed and compared with 4.8 expected deaths based on Ontario cancer death rates. The five cancer deaths resulted from three leukemias, one Wilms tumor, and one unspecified nervous system tumor. The preliminary findings did not demonstrate a significant leukemia risk arising from diagnostic cardiac catheterizations. Continued follow-up of this cohort is required to evaluate the risk of breast and thyroid cancers which can occur more than 20 years following radiation exposure.

Spengler, R.F.; Cook, D.H.; Clarke, E.A.; Olley, P.M.; Newman, A.M.

1983-02-01

174

Validity of ICD-9-CM Codes for the Identification of Complications Related to Central Venous Catheterization.  

PubMed

Two complications of central venous catheterization (CVC), iatrogenic pneumothorax and central line-associated bloodstream infection (CLABSI), have dedicated International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) codes. Despite increasing use of ICD-9-CM codes for research and pay-for-performance purposes, their validity for detecting complications of CVC has not been established. Complications of CVCs placed between July 2010 and December 2011 were identified by ICD-9-CM codes in discharge records from a single hospital and compared with those revealed by medical record abstraction. The ICD-9-CM code for iatrogenic pneumothorax had a sensitivity of 66.7%, specificity of 100%, positive predictive value (PPV) of 100%, and negative predictive value (NPV) of 99.5%. The ICD-9-CM codes for CLABSI had a sensitivity of 33.3%, specificity of 99.0%, PPV of 28.6%, and NPV of 99.2%. The low sensitivity and variable PPV of ICD-9-CM codes for detection of complications of CVC raise concerns about their use for research or pay-for-performance purposes. PMID:24343034

Tukey, Melissa H; Borzecki, Ann M; Wiener, Renda Soylemez

2015-01-01

175

Electrocardiograhic findings resulting in inappropriate cardiac catheterization laboratory activation for ST-segment elevation myocardial infarction  

PubMed Central

Background Prompt reperfusion has been shown to improve outcomes in patients with acute ST-segment elevation myocardial infarction (STEMI) with a goal of culprit vessel patency in <90 minutes. This requires a coordinated approach between the emergency medical services (EMS), emergency department (ED) and interventional cardiology. The urgency of this process can contribute to inappropriate cardiac catheterization laboratory (CCL) activations. Objectives One of the major determinants of inappropriate activations has been misinterpretation of the electrocardiogram (ECG) in the patient with acute chest pain. Methods We report the ECG findings for all CCL activations over an 18-month period after the inception of a STEMI program at our institution. Results There were a total of 139 activations with 77 having a STEMI diagnosis confirmed and 62 activations where there was no STEMI. The inappropriate activations resulted from a combination of atypical symptoms and misinterpretation of the ECG (45% due to anterior ST-segment elevation) on patient presentation. The electrocardiographic abnormalities were particularly problematic in African-Americans with left ventricular hypertrophy. Conclusions In this single-center, prospective observational study, nearly half of the inappropriate STEMI activations were due to the misinterpretation of anterior ST-segment elevation and this finding was commonly seen in African-Americans with left ventricular hypertrophy. PMID:25009790

Shamim, Shariq; McCrary, Justin; Wayne, Lori; Gratton, Matthew

2014-01-01

176

Escherichia coli Isolates Causing Asymptomatic Bacteriuria in Catheterized and Noncatheterized Individuals Possess Similar Virulence Properties ?  

PubMed Central

Urinary tract infections (UTIs) are among the most common infectious diseases of humans, with Escherichia coli being responsible for >80% of all cases. Asymptomatic bacteriuria (ABU) occurs when bacteria colonize the urinary tract without causing clinical symptoms and can affect both catheterized patients (catheter-associated ABU [CA-ABU]) and noncatheterized patients. Here, we compared the virulence properties of a collection of ABU and CA-ABU nosocomial E. coli isolates in terms of antibiotic resistance, phylogenetic grouping, specific UTI-associated virulence genes, hemagglutination characteristics, and biofilm formation. CA-ABU isolates were similar to ABU isolates with regard to the majority of these characteristics; exceptions were that CA-ABU isolates had a higher prevalence of the polysaccharide capsule marker genes kpsMT II and kpsMT K1, while more ABU strains were capable of mannose-resistant hemagglutination. To examine biofilm growth in detail, we performed a global gene expression analysis with two CA-ABU strains that formed a strong biofilm and that possessed a limited adhesin repertoire. The gene expression profile of the CA-ABU strains during biofilm growth showed considerable overlap with that previously described for the prototype ABU E. coli strain, 83972. This is the first global gene expression analysis of E. coli CA-ABU strains. Overall, our data suggest that nosocomial ABU and CA-ABU E. coli isolates possess similar virulence profiles. PMID:20444967

Watts, Rebecca E.; Hancock, Viktoria; Ong, Cheryl-Lynn Y.; Vejborg, Rebecca Munk; Mabbett, Amanda N.; Totsika, Makrina; Looke, David F.; Nimmo, Graeme R.; Klemm, Per; Schembri, Mark A.

2010-01-01

177

Modeling groundwater quality over a humid subtropical region using numerical indices, earth observation datasets, and X-ray diffraction technique: a case study of Allahabad district, India.  

PubMed

Water is undoubtedly the vital commodity for all living creatures and required for well-being of the human society. The present work is based on the surveys and chemical analyses performed on the collected groundwater samples in a part of the Ganga basin in order to understand the sources and evolution of the water quality in the region. The two standard indices such as water quality index and synthetic pollution index for the classification of water in the region are computed. The soil and sediment analysis are carried out with the help of X-ray diffractometer (XRD) for the identification of possible source of ions in water from rock and soil weathering. The dominant minerals which include quartz, muscovite, plagioclase, and orthoclase are reported in the area. The study further utilizes the multivariate statistical techniques for handling large and complex datasets in order to get better information about the groundwater quality. The following statistical methods such as cluster analysis (CA), factor analysis (FA), and principal component analysis (PCA) are applied to handle the large datasets and to understand the latent structure of the data. Through FA/PCAs, we have identified a total of 3 factors in pre-monsoon and 4 factors in post-monsoon season, which are responsible for the whole data structure. These factors explain 77.62 and 82.39 % of the total variance of the pre- and post-monsoon datasets. On the other hand, CA depicted the regions that have similar pollutants origin. The average value of synthetic pollution index of groundwater during pre-monsoon is 9.27, while during post-monsoon, it has been recorded as 8.74. On the other hand, the average values of water quality index of groundwater during pre-monsoon and post-monsoon seasons are found as 217.59 and 233.02, respectively. The study indicates that there occurs an extensive urbanization with gradual vast development of various small- and large-scale industries, which is responsible for degradation in water quality. The overall analysis reveals that the agricultural runoff, waste disposal, leaching, and irrigation with wastewater are the main causes of groundwater pollution followed by some degree of pollution from geogenic sources such as rock and soil weathering, confirmed through XRD analysis. PMID:25086613

Singh, Sudhir Kumar; Srivastava, Prashant K; Singh, Dharmveer; Han, Dawei; Gautam, Sandeep Kumar; Pandey, A C

2015-02-01

178

Lysine from cooked white rice consumed by healthy young men is highly metabolically available when assessed using the indicator amino acid oxidation technique.  

PubMed

Cooked white rice (CWR) provides up to 71% of the dietary protein for many people worldwide. The protein digestibility-corrected amino acid (AA) score is the method adopted by FAO/WHO to evaluate protein quality. Our group has proposed the metabolic availability (MA) of AAs as another determinant of protein quality. It measures the percentage of an indispensable AA that is incorporated during protein synthesis. This study is the first to our knowledge to assess the MA of l-lysine (L-Lys) from CWR in humans using the indicator AA oxidation (IAAO) technique. Three amounts of L-Lys, 10, 15, and 19 mg?·?kg(-1)?·?d(-1) (= 28.5, 42.8, and 54.3% of the mean L-Lys requirement of 35 mg?·?kg(-1)?·?d(-1)), were studied in 5 healthy young men in a repeated-measures design. To test the principle that the Maillard reaction has an effect on the MA of LLys, we also assessed the MA of L-Lys in oven-browned, cooked rice (n = 3) in the amount of 19 mg?·?kg(-1)?·?d(-1) L-Lys. The MA of L-Lys was estimated by comparing the IAAO response with varying L-Lys intakes in rice compared with the IAAO response to varying l-Lys intakes in the reference protein (crystalline AA mixture patterned after egg protein) using the slope ratio method. The MA of L-Lys from CWR was high (97%), but the effect of the Maillard reaction reduced it to 70%. The results show that despite its relatively low content in rice, L-Lys has a high MA when the rice is cooked without being browned. PMID:23325920

Prolla, Ivo R D; Rafii, Mahroukh; Courtney-Martin, Glenda; Elango, Rajavel; da Silva, Leila P; Ball, Ronald O; Pencharz, Paul B

2013-03-01

179

Impact of on-site cardiac catheterization on resource utilization and fatal and non-fatal outcomes after acute myocardial infarction  

PubMed Central

Background Patterns of care for acute myocardial infarction (AMI) strongly depend on the availability of on-site cardiac catheterization facilities. Although the management found at hospitals without on-site catheterization does not lead to increased mortality, little it known about its impact on resource utilization and non-fatal outcomes. Methods We identified all patients (n = 35,289) admitted with a first AMI in the province of Quebec between January 1, 1996 and March 31, 1999 using population-based administrative databases. Medical resource utilization and non-fatal and fatal outcomes were compared among patients admitted to hospitals with and without on-site cardiac catheterization facilities. Results Cardiac catheterization and PCI were more frequently performed among patients admitted to hospitals with catheterization facilities. However, non-invasive procedures were not used more frequently at hospitals without catheterization facilities. To the contrary, echocardiography [odds ratio (OR), 2.04; 95% confidence interval (CI), 1.93–2.16] and multi-gated acquisition imaging (OR, 1.24; 95% CI, 1.17–1.32) were used more frequently at hospitals with catheterization, and exercise treadmill testing (OR, 1.02; 95% CI, 0.91–1.15) and Sestamibi/Thallium imaging (OR, 0.93; 95% CI, 0.88–0.98) were used similarly at hospitals with and without catheterization. Use of anti-ischemic medications and frequency of emergency room and physician visits, were similar at both types of institutions. Readmission rates for AMI-related cardiac complications and mortality were also similar [adjusted hazard ratio, recurrent AMI: 1.02, 95% CI, 0.89–1.16; congestive heart failure: 1.02; 95% CI, 0.90–1.15; unstable angina: 0.93; 95% CI, 0.85–1.02; mortality: 0.99; 95% CI, 0.93–1.05)]. Conclusion Although on-site availability of cardiac catheterization facilities is associated with greater use of invasive cardiac procedures, non-availability of catheterization did not translate into a higher use of non-invasive tests or have an impact on the fatal and non-fatal outcomes available for study in our administrative database. PMID:17096849

Halabi, Abdul R; Beck, Christine A; Eisenberg, Mark J; Richard, Hugues; Pilote, Louise

2006-01-01

180

Referrals in Acute Coronary Events for CARdiac Catheterization: The RACE CAR trial  

PubMed Central

BACKGROUND: Women with acute coronary syndromes have lower rates of cardiac catheterization (CC) than men. OBJECTIVE: To determine whether sex/gender, age, risk level and patient preference influence physician decision making to refer patients for CC. METHODS: Twelve clinical scenarios controlling for sex/gender, age (55 or 75 years of age), Thrombolysis in Myocardial Infarction risk score (low, moderate or high) and patient preference for CC (agreeable or refused/no preference expressed) were designed. Scenarios were administered to specialists across Canada using a web-based computerized survey instrument. Questions were standardized using a five-point Likert scale ranging from 1 (very unlikely to benefit from CC) to 5 (very likely to benefit from CC). Outcomes were assessed using a two-tailed mixed linear regression model. RESULTS: Of 237 scenarios, physicians rated men as more likely to benefit from CC than women (mean [± SE] 4.44±0.07 versus 4.25±0.07, P=0.03), adjusted for age, risk and patient preference. Low-risk men were perceived to benefit more than low-risk women (4.20±0.13 versus 3.54±0.14, P<0.01), and low-risk younger patients were perceived to benefit more than low-risk older patients (4.52±0.17 versus 3.22±0.16, P<0.01). Regardless of risk, patients who agreed to CC were perceived as more likely to benefit from CC than patients who were disagreeable or made no comment at all (5.0±0.23, 3.67±0.21, 2.95±0.14, respectively, P<0.01). CONCLUSION: Canadian specialists’ decisions to refer patients for CC appear to be influenced by sex/gender, age and patient preference in clinical scenarios in which cardiac risk is held constant. Future investigation of possible age and sex/gender biases as proxies for risk is warranted. PMID:20931097

Kreatsoulas, Catherine; Sloane, Debi; Pogue, Janice; Velianou, James L; Anand, Sonia S

2010-01-01

181

YouTube as an educational tool regarding male urethral catheterization.  

PubMed

Abstract Objective. Urethral catheterization (UC) is a common procedure carried out on a daily basis. The aims of this study were to assess the quality of YouTube as an educational tool regarding male UC and to assess the experience of newly qualified doctors regarding UC. Materials and methods. YouTube was searched for videos containing relevant information about male UC. A checklist for evaluating content for male UC was devised. The top-ranked video was shown to interns and they were questioned regarding their experience of UC and the usefulness of the video. Results. A total of 100 videos was screened and 49 unique videos were identified. The median length of video was 7?min 15?s (range 1?min 44?s to 26?min 44?s). Regarding the Safe Catheter Insertion Score, the mean score was 5.18 ± 1.64. 9 (18.4%) deemed useful, 24 (49%) somewhat useful and 16 (32.7%) not useful. There was no difference in the number of views (p = 0.487), duration of video (p = 0.364) or number of days online (p = 0.123) between those categorized as useful, somewhat useful and not useful. Twenty-six interns (89.7%) attended the UC teaching session. All reported the video to be a useful educational adjunct. Nine of the respondents (42.9%) had independently inserted a urinary catheter before the educational session. Conclusions. The quality of videos on YouTube regarding male UC is widely variable. Preselected videos are deemed useful by junior doctors regarding male UC and can be used as an educational adjunct before performing hands-on tasks. PMID:25363608

Nason, Gregory J; Kelly, Padraig; Kelly, Michael E; Burke, Matthew J; Aslam, Asadullah; Giri, Subhasis K; Flood, Hugh D

2014-11-01

182

Prognostic utility of the exercise thallium-201 test in ambulatory patients with chest pain: comparison with cardiac catheterization  

SciTech Connect

The goal of this study was to determine the prognostic utility of the exercise thallium-201 stress test in ambulatory patients with chest pain who were also referred for cardiac catheterization. Accordingly, 4 to 8 year (mean +/- 1SD, 4.6 +/- 2.6 years) follow-up data were obtained for all but one of 383 patients who underwent both exercise thallium-201 stress testing and cardiac catheterization from 1978 to 1981. Eighty-three patients had a revascularization procedure performed within 3 months of testing and were excluded from analysis. Of the remaining 299 patients, 210 had no events and 89 had events (41 deaths, nine nonfatal myocardial infarctions, and 39 revascularization procedures greater than or equal to 3 months after testing). When all clinical, exercise, thallium-201, and catheterization variables were analyzed by Cox regression analysis, the number of diseased vessels (when defined as greater than or equal to 50% luminal diameter narrowing) was the single most important predictor of future cardiac events (chi 2 = 38.1) followed by the number of segments demonstrating redistribution on delayed thallium-201 images (chi 2 = 16.3), except in the case of nonfatal myocardial infarction, for which redistribution was the most important predictor of future events. When coronary artery disease was defined as 70% or greater luminal diameter narrowing, the number of diseased vessels significantly (p less than .01) lost its power to predict events (chi 2 = 14.5). Other variables found to independently predict future events included change in heart rate from rest to exercise (chi 2 = 13.0), ST segment depression on exercise (chi 2 = 13.0), occurrence of ventricular arrhythmias on exercise (chi 2 = 5.9), and beta-blocker therapy (chi 2 = 4.3).

Kaul, S.; Lilly, D.R.; Gascho, J.A.; Watson, D.D.; Gibson, R.S.; Oliner, C.A.; Ryan, J.M.; Beller, G.A.

1988-04-01

183

Further fMRI Validation of the Visual Half Field Technique as an Indicator of Language Laterality: A Large-Group Analysis  

ERIC Educational Resources Information Center

The best established lateralized cerebral function is speech production, with the majority of the population having left hemisphere dominance. An important question is how to best assess the laterality of this function. Neuroimaging techniques such as functional Magnetic Resonance Imaging (fMRI) are increasingly used in clinical settings to…

Van der Haegen, Lise; Cai, Qing; Seurinck, Ruth; Brysbaert, Marc

2011-01-01

184

Environmental Indicators  

NSDL National Science Digital Library

Environment Canada has developed a set of environmental indicators that are easily measurable and provide useful clues on the state of the environment. This Web site provides a listing of those indicators that Environment Canada monitors. For each indicator, there is a detailed description of the environmental indicator, how it relates to larger environmental problems, and what is being done to reduce the threat. A number of Web links are provided for further information on each indicator.

185

Thermal indicator for wells  

DOEpatents

Minute durable plate-like thermal indicators are employed for precision measuring static and dynamic temperatures of well drilling fluids. The indicators are small enough and sufficiently durable to be circulated in the well with drilling fluids during the drilling operation. The indicators include a heat resistant indicating layer, a coacting meltable solid component and a retainer body which serves to unitize each indicator and which may carry permanent indicator identifying indicia. The indicators are recovered from the drilling fluid at ground level by known techniques.

Gaven, Jr., Joseph V. (Oakton, VA); Bak, Chan S. (Newbury Park, CA)

1983-01-01

186

Stenting as a Rescue Treatment of a Pulmonary Artery False Aneurysm Caused by Swan-Ganz Catheterization  

PubMed Central

Pulmonary vascular injury is a rare but life-threatening complication of Swan-Ganz catheterization. We report an 82-year old patient who underwent right heart catheterization by a balloon-tipped catheter because of suspected pulmonary hypertension. After deflation of the catheter in the wedge position, hemoptoe appeared associated with acute respiratory insufficiency requiring respiratory support by intubation and mechanical ventilation. Pulmonary angiography showed the formation of a false aneurysm of a segment artery of the left lower lobe. Immediate interventional therapy was performed by the implantation of two coated coronary stent grafts into the injured pulmonary artery thereby excluding the false aneurysm. Bleeding was stopped by this interventional approach while antegrade blood flow was maintained. Long term follow-up after 3 months showed an effective treatment with a completely thrombotic false aneurysm. However, despite oral anticoagulation and dual antiplatelet therapy, graft patency could not be achieved after 3 months. In summary, implantation of coated stents is a feasible and safe approach for the acute and long term treatment of potentially life-threatening condition of a pulmonary artery false aneurysm while treatment to achieve long term patency of the affected vessel still remains an issue to be resolved. PMID:25610693

Keymel, Stefanie; Merx, Marc W.; Zeus, Tobias; Kelm, Malte; Steiner, Stephan

2014-01-01

187

An evaluation of single-site statistical downscaling techniques in terms of indices of climate extremes for the Midwest of Iran  

NASA Astrophysics Data System (ADS)

Seven single-site statistical downscaling methods for daily temperature and precipitation, including four deterministic algorithms [analog model (ANM), quantile mapping with delta method extrapolation (QMD), cumulative distribution function transform (CDFt), and model-based recursive partitioning (MOB)] and three stochastic algorithms [generalized linear model (GLM), Conditional Density Estimation Network Creation and Evaluation (CaDENCE), and Statistical Downscaling Model-Decision Centric (SDSM-DC] are evaluated at nine stations located in the mountainous region of Iran's Midwest. The methods are of widely varying complexity, with input requirements that range from single-point predictors of temperature and precipitation to multivariate synoptic-scale fields. The period 1981-2000 is used for model calibration and 2001-2010 for validation, with performance assessed in terms of 27 Climate Extremes Indices (CLIMDEX). The sensitivity of the methods to large-scale anomalies and their ability to replicate the observed data distribution in the validation period are separately tested for each index by Pearson correlation and Kolmogorov-Smirnov (KS) tests, respectively. Combined tests are used to assess overall model performances. MOB performed best, passing 14.5 % (49.6 %) of the combined (single) tests, respectively, followed by SDSM, CaDENCE, and GLM [14.5 % (46.5 %), 13.2 % (47.1 %), and 12.8 % (43.2 %), respectively], and then by QMD, CDFt, and ANM [7 % (45.7 %), 4.9 % (45.3 %), and 1.6 % (37.9 %), respectively]. Correlation tests were passed less frequently than KS tests. All methods downscaled temperature indices better than precipitation indices. Some indices, notably R20, R25, SDII, CWD, and TNx, were not successfully simulated by any of the methods. Model performance varied widely across the study region.

Farajzadeh, M.; Oji, R.; Cannon, A. J.; Ghavidel, Y.; Massah Bavani, A.

2014-05-01

188

Meta-analysis of randomized controlled trials of preprocedural statin administration for reducing contrast-induced acute kidney injury in patients undergoing coronary catheterization.  

PubMed

Preprocedural statin administration may reduce contrast-induced acute kidney injury (CI-AKI), but current evidence is controversial. Randomized controlled trials (RCTs) comparing preprocedural statin administration before coronary catheterization with standard strategies were searched in MEDLINE/PubMed, EMBASE, Scopus, Cochrane Library, Web of Science, and ScienceDirect databases. The outcome of interest was the incidence of postprocedural CI-AKI. Prespecified subgroup analyses were performed according to baseline glomerular filtration rate (GFR), statin type, and N-acetylcysteine use. Eight RCTs were included for a total of 4,984 patients. The incidence of CI-AKI was 3.91% in the statin group (n = 2,480) and 6.98% in the control group (n = 2,504). In the pooled analysis using a random-effects model, patients receiving statins had 46% lower relative risk (RR) of CI-AKI compared with the control group (RR 0.54, 95% confidence interval [CI] 0.38 to 0.78, p = 0.001). A moderate degree of non-significant heterogeneity was present (I(2) = 41.9%, chi-square = 12.500, p = 0.099, ?² = 0.100). In the subanalysis based on GFR, the pooled RR indicated a persistent benefit with statins in patients with GFR <60 ml/min (RR 0.67, 95% CI 0.45 to 1.00, p = 0.050) and a highly significant benefit in patients with GFR ?60 ml/min (RR 0.40, 95% CI 0.27 to 0.61, p <0.0001). Statin type and N-acetylcysteine or hydration did not significantly influence the results. In conclusion, preprocedural statin use leads to a significant reduction in the pooled RR of CI-AKI. PMID:25001154

Giacoppo, Daniele; Capodanno, Davide; Capranzano, Piera; Aruta, Patrizia; Tamburino, Corrado

2014-08-15

189

Is noninvasive risk stratification sufficient, or should all patients undergo cardiac catheterization and angiography after a myocardial infarction?  

PubMed

From the foregoing discussion, it becomes apparent that although noninvasive risk stratification is a reasonable approach to assessment of patients following an uncomplicated myocardial infarction, the performance of early cardiac catheterization and angiography on nearly all such patients is not unreasonable and may in fact be the most practical approach. The basis for this rationalization may be summarized as follows: 1. Many subgroups will need early catheterization anyway a. Myocardial infarction complicated by recurrent ischemia, heart failure, or complex ventricular arrhythmias b. Patients receiving thrombolytic treatment c. "Young" patients (less than 50 years old?) d. "Older" patients (over ages 65 to 70?) in otherwise good medical condition e. Patients unable to exercise f. Patients with abnormal or inconclusive noninvasive test results (approximately 70 percent of patients) 2. Cardiac catheterization and angiography as a single test provides the two most powerful prognostic variables following myocardial infarction, namely, the extent of coronary artery disease and residual left ventricular function. This knowledge is reassuring to both physician and patient and allows for planning of optimal long-term management. 3. Certain limitations exist in noninvasive risk assessment strategies. 4. This approach need not be significantly more costly, if all tests are used wisely. The major risk inherent in the definition of the extent of coronary artery disease in all survivors of acute myocardial infarction might be the performance of unnecessary revascularization procedures (percutaneous transluminal coronary angioplasty or coronary bypass surgery). The burden rests with the individual clinician to (1) collect all useful and necessary data; (2) assess reliability and accuracy of various tests available at one's own institution; (3) avoid performing unnecessary and repetitive tests; (4) interpret the data in the proper context; and (5) counsel patients appropriately, correctly, and judiciously about their prognosis and therapeutic options. In this manner, all patients who might benefit appropriately from revascularization can be discovered early and offered this therapeutic option. Other patients can also be managed more appropriately; for example, those who are truly at very low risk (normal left ventricular function and either normal coronary arteries or "mild" coronary artery disease). However, it is most important to avoid unnecessary revascularization procedures. Although this discussion has focused on noninvasive and invasive testing following myocardial infarction, it is necessary to emphasize that comprehensive management of coronary artery disease and its complications should not be neglected in these patients; for example, control or amelioration of risk factors for coronary artery disease is mandatory in all these patients, and in their families as well. PMID:2199055

Kulick, D L; Rahimtoola, S H

1990-01-01

190

Is Cardiac Catheterization Necessary Prior to Initial Management of Patients with Stable Ischemic Heart Disease? Results from a Web-based Survey of Cardiologists  

Microsoft Academic Search

BackgroundIt is unknown whether preconceived beliefs regarding the need for cardiac catheterization and revascularization in stable ischemic heart disease (SIHD) patients would preclude a study randomizing patients with significant ischemia to a conservative strategy. Given the widespread practice of performing revascularization in SIHD patients, we assessed the feasibility of conducting a randomized trial comparing initial invasive and conservative strategies in

David J. Maron; Gregg W. Stone; Daniel S. Berman; G. B. John Mancini; Theresa A. Scott; Daniel W. Byrne; Frank E. Harrell; Leslee J. Shaw; Rory Hachamovitch; William E. Boden; William S. Weintraub; John A. Spertus

191

“What the Eyes Don’t See, the Heart Doesn’t Grieve Over”: Epidemiology and Risk Factors for Bloodstream Infections following Cardiac Catheterization  

PubMed Central

No standard definition exists for surveillance and characterization of the epidemiology of bloodstream infections (BSIs) after cardiac catheterization (CC) procedures. We proposed a novel case definition and determined the epidemiology and risk factors of BSIs after CC procedure using this new definition. PMID:22759552

Dicks, Kristen V.; Staheli, Russell; Anderson, Deverick J.; Miller, Becky A.; Jones, W. Schuyler; Harrison, J. Kevin; Sexton, Daniel J.; Moehring, Rebekah W.; Chen, Luke F.

2013-01-01

192

"What the eyes don't see, the heart doesn't grieve over": epidemiology and risk factors for bloodstream infections following cardiac catheterization.  

PubMed

No standard definition exists for surveillance and characterization of the epidemiology of bloodstream infections (BSIs) after cardiac catheterization (CC) procedures. We proposed a novel case definition and determined the epidemiology and risk factors of BSIs after CC procedure using this new definition. PMID:22759552

Dicks, Kristen V; Staheli, Russell; Anderson, Deverick J; Miller, Becky A; Jones, W Schuyler; Harrison, J Kevin; Sexton, Daniel J; Moehring, Rebekah W; Chen, Luke F

2012-08-01

193

A complete treatment of adult living donor liver transplantation: a review of surgical technique and current challenges to expand indication of patients.  

PubMed

The growing disparity between the number of liver transplant candidates and the supply of deceased donor organs has motivated the development of living donor liver transplantation (LDLT). Over the last two decades, the operation has been markedly improved by innovations rendering modern results comparable with those of deceased donor liver transplantation (DDLT). However, there remains room for further innovation, particularly in adult living donor liver transplantation (ALDLT). Unlike whole-size DDLT and pediatric LDLT, size-mismatching between ALDLT graft and recipient body weight and changing dynamics of posttransplant allograft regeneration have remained major challenges. A better understanding of the complex surgical anatomy and physiologic differences of ALDLT helps avoid small-for-size graft syndrome, graft congestion from outflow obstruction and graft hypoperfusion from portal flow steal. ALDLT for high-urgency patients (Model for End-Stage Liver Disease score >30) can achieve results comparable to DDLT in high volume centers. Size limitations of partial grafts and donor safety issues can be overcome with dual grafts and modified right-lobe grafts that preserve the donor's middle hepatic vein trunk. Extended application of LDLT for unresectable hepatocellular carcinoma above Milan criteria is an optional strategy at the cost of slightly compromised survival. ABO-blood group incompatibility obstacles have been broken down by introducing a paired donor exchange program and refined peri-operative management of ABO-incompatible ALDLT. This review focuses on recent innovations of surgical techniques, safe donor selection, current strategies to expand ALDLT with broadened patient selection criteria and important aspects of teamwork required for success. PMID:25358749

Lee, S-G

2015-01-01

194

GIS modelling of seismic vulnerability of residential fabrics considering geotechnical, structural, social and physical distance indicators in Tehran city using multi-criteria decision-making (MCDM) techniques  

NASA Astrophysics Data System (ADS)

The main issue in determining the seismic vulnerability is having a comprehensive view to all probable damages related to earthquake occurrence. Therefore, taking factors such as peak ground acceleration (PGA) in the time of earthquake occurrence, the type of structures, population distribution among different age groups, level of education, the physical distance to a hospitals (or medical care centers), etc. into account and categorized under four indicators of geotechnical, structural, social and physical distance to needed facilities and distance from dangerous ones will provide us with a better and more exact outcome. To this end in this paper using analytic hierarchy process (AHP), the amount of importance of criteria or alternatives are determined and using geographical information system (GIS), the vulnerability of Tehran metropolitan as a result of an earthquake, is studied. This study focuses on the fact that Tehran is surrounded by three active and major faults of the Mosha, North Tehran and Rey. In order to comprehensively determine the vulnerability, three scenarios are developed. In each scenario, seismic vulnerability of different areas in Tehran city is analysed and classified into four levels including high, medium, low and safe. The results show that regarding seismic vulnerability, the faults of Mosha, North Tehran and Rey respectively make 6, 16 and 10% of Tehran area highly vulnerable and also 34, 14 and 27% are safe.

Rezaie, F.; Panahi, M.

2014-09-01

195

RBC indices  

MedlinePLUS

... corpuscular hemoglobin concentration (MCHC); Mean corpuscular volume (MCV); Red blood cell indices ... and hemoglobin. The MCV reflects the size of red blood cells. The MCH and MCHC reflect the ...

196

Transcatheter aortic valve replacement: establishing a comprehensive program model for hybrid cardiac catheterization laboratories in the Department of Veterans Affairs.  

PubMed

Aortic valve disease, especially aortic stenosis, becomes progressively debilitating and carries a high mortality risk if it is categorized as severe and symptomatic (J Thorac Cardiovas Surg. 2012;144(3):e29-e84). In the past, the only treatment for aortic stenosis was surgical aortic valve replacement. Surgical treatment may require several hours of cardioplegia, and if the patient has comorbidities, such as renal failure or chronic obstructive pulmonary disease, their operative mortality percentage increases.In 2011, the US Food and Drug Administration approved the use of a transcatheter aortic valve replacement (TAVR) procedure for patients who were deemed high risk or inoperative for the routine surgical aortic valve replacement surgery. More than 20,?000 TAVRs have been performed in patients worldwide since 2002 when Dr Alain Cribier performed the first-in-man TAVR (Arch Cardiovasc Dis. 2012;105(3):145-152). The Edwards Lifesciences SAPIEN XT valve and the Medtronic CoreValve are commercially available.The clinical findings and economic statistic have supported the expansion of the TAVR procedure. However, there has been considerable controversy over where the procedure is to occur and who is directly responsible for directing the TAVR care. This debate has identified barriers to the implementation of a TAVR program. The operating rooms and a cardiac catheterization laboratory are underprepared for the hybrid valve replacement therapy. Because of the barriers identified, the Department of Veterans Affairs determined a need for a systematic approach to review the programs that applied for this structural heart disease program. A centralized team was developed to ensure room readiness and staff competency. The use of the Health Failure Mode and Effects Analysis can define high-risk clinical processes and conduct a hazard analysis. Worksheets can show potential failure modes and their probabilities, along with actions and outcome measures, team collaboration, extensive screening, and selection process. The TAVR program begins implementation with data entry with each case into CART-CL (Cardiovascular Assessment, Reporting and Tracking System for Cath Labs, Veteran Administration database for interventional cardiology procedures). If an untoward event occurs, within 24 hours the CART-CL Quality Assessment Team is activated to begin the review process. This provides real-time review and feedback to the local facility in an expeditious manner. Cardiac catheterization laboratories have been inundated with rapidly changing technological advances in the past decade. The era for structural heart repair is rapidly mobilizing from a surgical/operating room setting to a transcatheter/hybrid catheterization laboratory suite. The use of the new hybrid catheterization laboratories will continue to expand as the approval of future transcatheter therapies evolve. Editor's note: Due to the volume of important information presented in each table, only the first table is included in the print version of the article, however, all tables may be viewed in their entirety free of charge on the online version of this article: http://journals.lww.com/dccnjournal/pages/default.aspx. PMID:25144213

Speiser, Bernadette; Dutra-Brice, Cynthia

2014-01-01

197

Determination of cytoplasmic calcium concentration in Dryopteris spores: a developmentally non-disruptive technique for loading of the calcium indicator fura-2  

NASA Technical Reports Server (NTRS)

Germination of Dryopteris spores is mediated by the physiologically active, far-red-absorbing form of phytochrome, Pfr, and external Ca2+ is necessary for the transduction of the light signal. Because knowledge about the cytoplasmic calcium ion concentration, [Ca2+]i, is of great importance for understanding the role of calcium during signal transduction, this value was measured using fura-2 in fern spores undergoing the normal developmental progression into germination. Fura-2 was loaded into the spores by electroporation, which does not disrupt the normal process of germination. The intensity of the fluorescence emission of the loaded fura-2 was analysed by a microspectrophotometric assay of single spores, and successful loading could be obtained by the application of ten electrical pulses (field strength 7.5 kV cm-1, half-life (time constant) 230 microseconds). Fura-2 was alternately excited by light of wavelengths 355 and 385 nm through an inverted fluorescence microscope, and the emitted fura-2 fluorescence was collected by a silicon-intensified video camera. The cytoplasmic calcium ion concentration was calculated from the ratio of the camera output obtained for both wavelengths and displayed by a pseudo-color technique. Spores responded to changes of the extracellular Ca2+ concentration, and this observation is considered as evidence that fura-2 is loaded into the cytoplasm. The substitution of a low external [Ca2+] (1 mM ethyleneglycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid (EGTA)) by 1 mM CaCl2 caused a fast increase of [Ca2+]i from approx. 50 nM to above 500 nM. In contrast, the subsequent substitution of CaCl2 by EGTA decreased [Ca2+]i again below 100 nM within 0.5 h. Furthermore, the application of ionomycin could initiate a change in [Ca2+]i according to the Ca2+ gradient established between the extracellular medium and cytoplasm. In spores sown on a Ca(2+) -free medium, [Ca2+]i, analysed in a buffer containing EGTA, was found to be around 50 nM during the first days of cultivation, independent of the irradiation protocol. However, if spores were grown in darkness on a Ca(2+) -containing medium and analysed in EGTA, [Ca2+]i was significantly higher (> or = 500 nM). In red-light-irradiated spores, [Ca2+]i was found to decrease with increasing time after irradiation, and was determined to be less than 100 nM when analysis was done 44 h after germination was initiated by the light treatment.

Scheuerlein, R.; Schmidt, K.; Poenie, M.; Roux, S. J.

1991-01-01

198

Transcatheter Thrombolysis with High-Dose Bolus Tissue Plasminogen Activator in Iatrogenic Arterial Occlusion after Femoral Arterial Catheterization  

SciTech Connect

Purpose: To assess the efficacy of percutaneous local thrombolysis with high-dose bolus recombinant tissue plasminogen activator (rt-PA) in patients with acute limb ischemia due to arterial thrombosis after cardiac catheterization.Methods: We treated eight patients (7 men; mean age 56 years) with thrombotic occlusion of both the common femoral artery (CFA) and external iliac artery (EIA) in six patients and of the CFA only in two patients. Two 5 mg boluses of rt-PA were injected into the proximal clot through a 5 Fr end-hole catheter and subsequently two additional boluses of 5 mg rt-PA were given through a catheter with multiple side-holes. In case of a significant amount of residual thrombus, a continuous infusion of 2.5 mg/hr of rt-PA was started.Results: Successful lysis was achieved in all patients. The mean duration of lysis was 2 hr 41 min. The mean total amount of rt-PA delivered was 23.16 mg. In four patients unmasked flow-limited dissections confined to the CFA were managed by prolonged balloon dilatation, while in the remaining four patients with extension of the dissection to the external iliac artery one or two Easy Wallstents were implanted. There was prompt relief of lower limb ischemic symptoms and signs in all patients. Two groin hematomas were conservatively treated.Clinical and color Doppler flow imaging follow-up with a mean duration of 15 months, showed no reappearance of ischemic symptoms or development of restenosis in any of the patients. One patient died 6 months after thrombolysis.Conclusions: Transcatheter thrombolysis with high-dose bolus rt-PA is a safe and effective treatment inpatients with iatrogenic arterial occlusion after femoral catheterization. Underlying dissections should be treated by prolonged balloon dilatation but stent implantation is often required.

Tsetis, Dimitrios K. [Medical School of Heraklion, Department of Radiology, University Hospital Heraklion, 71500 Heraklion-Stravrakia, Crete (Greece); Kochiadakis, George E. [Medical School of Heraklion, Department ofCardiology, University Hospital of Heraklion, Crete (Greece); Hatzidakis, Adam A. [Medical School of Heraklion, Department of Radiology, University Hospital Heraklion, 71500 Heraklion-Stravrakia, Crete (Greece); Skalidis, Emannuel I. [Medical School of Heraklion, Department of Cardiology, University Hospital of Heraklion, Crete (Greece); Chryssou, Evangelia G.; Tritou, Ioanna N. [Medical School of Heraklion, Department of Radiology, University Hospital Heraklion, 71500 Heraklion-Stravrakia, Crete (Greece); Vardas, Panos E. [Medical School of Heraklion, Department of Cardiology, University Hospital of Heraklion, Crete (Greece); Gourtsoyiannis, Nicholas C. [Medical School of Heraklion, Department ofRadiology, University Hospital Heraklion, 71500 Heraklion-Stravrakia, Crete (Greece)

2002-01-15

199

The good, the bad and the ugly of catheterization practices among elite athletes with spinal cord injury: a global perspective.  

PubMed

Study design:Despite significant progress in bladder management, urinary tract infections (UTIs) are still common among individuals with spinal cord injury (SCI), and could negatively impact their health and quality of life. However, there are no data available on bladder management and frequency of UTIs among elite athletes with SCI.Methods:Athletes were assessed during the London 2012 Paralympic Games and 2013 Paracycling World Championships. Athletes completed the standard form of the International Standards to Document remaining Autonomic Functions after SCI, along with the standardized Autonomic Function Questionnaire.Results:A total of 61 (age=35.5±7.7 years (mean±s.d.); time since injury=16.0±7.6 years) elite athletes from 15 countries with traumatic SCI and who used clean intermittent catheterization were included in this study. The majority (75%) were from developed nations. Athletes catheterized on average 6±2 times per day. We found that individuals who reused catheters experienced more frequent UTIs (P<0.001). We also demonstrated that 83% of individuals from developed nations never reused a single-use catheter, whereas only 27% of individuals from developing nations used a new catheter each time (P<0.001). We also noted a twofold increase in the frequency of UTIs in individuals from developing nations (P=0.027).Conclusions:This study demonstrates that catheter reuse is intimately linked to UTI frequency and provides novel insight on bladder function and management in elite athletes with SCI. Reasons for catheter reuse may be due to a lack of health education and/or a lack of bladder-management resources. (Support: Craig Neilsen Foundation, ICORD, IPC)Spinal Cord advance online publication, 25 November 2014; doi:10.1038/sc.2014.208. PMID:25420496

Krassioukov, A; Cragg, J J; West, C; Voss, C; Krassioukov-Enns, D

2014-11-25

200

Social Indicators  

NSDL National Science Digital Library

The House of Commons Library Research Papers are published for the benefit of Parliament members, but this one should be of interest to both researchers and general readers wanting to learn more about contemporary British social issues. Social Indicators is the first paper in a new series that will be published three times a year. The 71-page paper includes a wide range of topic pages that present social statistics on a variety of issues, from the prison population to defense expenses to agricultural outputs. Each Social Indicator paper will also offer feature articles that give a closer look at specific subjects (in this instance,, election turnout and adult literacy) and an article on statistical sources for a particular issue (in this paper, social security statistics). The last few pages are devoted to a list of important, recent governmental statistical publications.

Bolton, Paul.

2001-01-01

201

Change vector analysis to categorise land cover change processes using the tasselled cap as biophysical indicator: description: implementing Landsat TM and ETM to detect land cover and land use changes in the mount Cameroon region using the CVA technique with the tasselled cap as biophysical indicator.  

PubMed

The continuous extraction of wood and the conversion of forest to small- and large-scale agricultural parcels is rapidly changing the land cover of the mount Cameroon region. The changes occur at varying spatial scales most often not more than 2ha for the small-scale subsistence farms and above 10ha for the extensive agricultural plantations of cocoa and palm. Given the importance of land use and land cover data in conservation planning, accurate and efficient techniques to provide up-to-date change information are required. A number of techniques for realising the detection of land cover dynamics using remotely sensed imagery have been formulated, tested and assessed with the results varying with respect to the change scenario under investigation, the information required and the imagery applied. In this study the Change Vector Analysis (CVA) technique was implemented on multitemporal multispectral Landsat data from the Thematic Mapper (TM) and Enhanced Thematic Mapper (ETM) sensors to monitor the dynamics of forest change in the mount Cameroon region. CVA was applied to multi-temporal data to compare the differences in the time-trajectory of the tasseled cap greenness and brightness for two successive time periods - 1987 and 2002. The tasseled cap was selected as biophysical indicator because it optimises the data viewing capabilities of vegetation, representing the basic types of land cover - vegetation, soil and water. Classes were created arbitrarily to predict the technique's potential in monitoring forest cover changes in the mount Cameroon region. The efficiency of the technique could not be fully assessed due to the inavailability of sufficient ground truth data. Assessment was based on the establishment of an error matrix of change versus no-change. The overall accuracy was 70%. The technique nevertheless demonstrated immense potentials in monitoring forest cover change dynamics especially when complemented with field studies. PMID:18193332

Siwe, Rene Ngamabou; Koch, Barbara

2008-10-01

202

Radial Artery Coursing Behind the Biceps Brachii Tendon: Significance for the Transradial Catheterization and a Clinically Oriented Classification of the Radial Artery Variations  

SciTech Connect

In routine clinical practice the variations of the radial artery are the main reason for technical failure during transradial catheterization. If these variations are well documented, however, they do not represent a problem in the transradial approach. Therefore, we report here a rare case of the radial artery which is very strange but potentially valuable for the clinical practice: it arises at a right angle from the brachial artery and passes behind the biceps brachii tendon. Based on our findings and on an extensive literature review, we propose for the first time a clinically oriented classification of the variations of the radial artery. This classification is related to the catheterization success at the usual access site of the radial artery at the wrist.

Jelev, L., E-mail: ljelev@abv.bg; Surchev, L. [Medical University Sofia, Department of Anatomy, Histology and Embryology (Bulgaria)

2008-09-15

203

Impact of myocardial perfusion single-photon emission computed tomography on referral to catheterization of the very elderly Is there evidence of gender-related referral bias?  

Microsoft Academic Search

Objectives. This study sought to assess the impact of myocardial perfusion studies on subsequent management in the very elderly with respect to referral to catheterization or revascularization.Background. The very elderly are a rapidly growing segment of the U.S. population, and myocardial perfusion studies are frequently performed in this patient subset for evaluation of coronary artery disease.Methods. The study utilized 1,006

Aman M. Amanullah; Hosen Kiat; Rory Hachamovitch; J. Arthur Cabico; John D. Friedman; Daniel S. Berman

1996-01-01

204

Image Fusion of Preprocedural CTA with Real-time Fluoroscopy to Guide Proper Hepatic Artery Catheterization During Transarterial Chemoembolization of Hepatocellular Carcinoma: A Feasibility Study  

SciTech Connect

To assess feasibility of proper hepatic artery catheterization using a 3D model obtained from preprocedural computed tomographic angiography (CTA), fused with real-time fluoroscopy, during transarterial chemoembolization of hepatocellular carcinoma. Twenty consecutive cirrhotic patients with hepatocellular carcinoma undergoing transarterial chemoembolization were prospectively enrolled onto the study. The early arterial phase axial images of the preprocedural CTA were postprocessed on an independent workstation connected to the angiographic system (Innova 4100; GE Healthcare, Milwaukee, WI), obtaining a 3D volume rendering image (VR) that included abdominal aorta, splanchnic arteries, and first and second lumbar vertebrae. The VR image was manually registered to the real-time X-ray fluoroscopy, with the lumbar spine used as the reference. The VR image was then used as guidance to selectively catheterize the proper hepatic artery. The procedure was considered successful when performed with no need for intraarterial contrast injections or angiographic acquisitions. The procedure was successful in 19 (95 %) of 20 patients. In one patient, celiac trunk angiography was required for the presence of a significant ostial stenosis that was underestimated at computed tomography. Time for image reconstruction and registration was <10 min in all cases. The use of preprocedural CTA model with fluoroscopy enables confident and direct catheterization of the proper hepatic artery with no need for preliminary celiac trunk angiography, thus reducing radiation exposure and contrast media administration.

Bargellini, Irene, E-mail: irenebargellini@hotmail.com; Turini, Francesca; Bozzi, Elena; Lauretti, Dario; Cicorelli, Antonio; Lunardi, Alessandro; Cioni, Roberto; Bartolozzi, Carlo [University of Pisa, Department of Diagnostic and Interventional Radiology (Italy)] [University of Pisa, Department of Diagnostic and Interventional Radiology (Italy)

2013-04-15

205

The influence of patient size on dose conversion coefficients: a hybrid phantom study for adult cardiac catheterization.  

PubMed

In this study, the influence of patient size on organ and effective dose conversion coefficients (DCCs) was investigated for a representative interventional fluoroscopic procedure-cardiac catheterization. The study was performed using hybrid phantoms representing an underweight, average and overweight American adult male. Reference body sizes were determined using the NHANES III database and parameterized based on standing height and total body mass. Organ and effective dose conversion coefficients were calculated for anterior-posterior, posterior-anterior, left anterior oblique and right anterior oblique projections using the Monte Carlo code MCNPX 2.5.0 with the metric dose area product being used as the normalization factor. Results show body size to have a clear influence on DCCs which increased noticeably when body size decreased. It was also shown that if patient size is neglected when choosing a DCC, the organ and effective dose will be underestimated to an underweight patient and will be overestimated to an underweight patient, with errors as large as 113% for certain projections. Results were further compared with those published for a KTMAN-2 Korean patient-specific tomographic phantom. The published DCCs aligned best with the hybrid phantom which most closely matched in overall body size. These results highlighted the need for and the advantages of phantom-patient matching, and it is recommended that hybrid phantoms be used to create a more diverse library of patient-dependent anthropomorphic phantoms for medical dose reconstruction. PMID:19458408

Johnson, Perry; Lee, Choonsik; Johnson, Kevin; Siragusa, Daniel; Bolch, Wesley E

2009-06-21

206

The influence of patient size on dose conversion coefficients: a hybrid phantom study for adult cardiac catheterization  

NASA Astrophysics Data System (ADS)

In this study, the influence of patient size on organ and effective dose conversion coefficients (DCCs) was investigated for a representative interventional fluoroscopic procedure—cardiac catheterization. The study was performed using hybrid phantoms representing an underweight, average and overweight American adult male. Reference body sizes were determined using the NHANES III database and parameterized based on standing height and total body mass. Organ and effective dose conversion coefficients were calculated for anterior-posterior, posterior-anterior, left anterior oblique and right anterior oblique projections using the Monte Carlo code MCNPX 2.5.0 with the metric dose area product being used as the normalization factor. Results show body size to have a clear influence on DCCs which increased noticeably when body size decreased. It was also shown that if patient size is neglected when choosing a DCC, the organ and effective dose will be underestimated to an underweight patient and will be overestimated to an underweight patient, with errors as large as 113% for certain projections. Results were further compared with those published for a KTMAN-2 Korean patient-specific tomographic phantom. The published DCCs aligned best with the hybrid phantom which most closely matched in overall body size. These results highlighted the need for and the advantages of phantom-patient matching, and it is recommended that hybrid phantoms be used to create a more diverse library of patient-dependent anthropomorphic phantoms for medical dose reconstruction.

Johnson, Perry; Lee, Choonsik; Johnson, Kevin; Siragusa, Daniel; Bolch, Wesley E.

2009-06-01

207

[The puncture and catheterization of the peripheral vessels using ultrasonic scanning].  

PubMed

Having many-year experience with angiographic interventions, the authors examined the potentialities of ultrasonic angioscanning to monitor the implementation of endovascular interventions (EVI). During the study, they developed an original procedure of different EVI with intraoperative ultrasonic monitoring, refined the ultrasonic semiotics of the procedure, achieved positive results in preventing possible complications. The authors made indications for the procedure and rational ways of its application more concrete. They provide evidence for that the proposed procedure greatly facilitates the performance of different intravascular procedures and reduces the time (or excludes) teleradioscopy, thus lowering the radiation burden on the staff and the patient. PMID:9755633

Demidov, I N; Shumski?, V I; Vishniakova, M V

1998-01-01

208

Long-term catheterization: current approaches in the diagnosis and treatment of port-related infections  

PubMed Central

Since the first description in 1982, totally implanted venous access ports have progressively improved patients’ quality of life and medical assistance when a medical condition requires the use of long-term venous access. Currently, they are part of the standard medical care for oncohematologic patients. However, apart from mechanical and thrombotic complications, there are also complications associated with biofilm development inside the catheters. These biofilms increase the cost of medical assistance and extend hospitalization. The most frequently involved micro-organisms in these infections are gram-positive cocci. Many efforts have been made to understand biofilm formation within the lumen catheters, and to resolve catheter-related infection once it has been established. Apart from systemic antibiotic treatment, the use of local catheter treatment (ie, antibiotic lock technique) is widely employed. Many different antimicrobial options have been tested, with different outcomes, in clinical and in in vitro assays. The stability of antibiotic concentration in the lock solution once instilled inside the catheter lumen remains unresolved. To prevent infection, it is mandatory to perform hand hygiene before catheter insertion and manipulation, and to disinfect catheter hubs, connectors, and injection ports before accessing the catheter. At present, there are still unresolved questions regarding the best antimicrobial agent for catheter-related bloodstream infection treatment and the duration of concentration stability of the antibiotic solution within the lumen of the port. PMID:24570595

Bustos, Cesar; Aguinaga, Aitziber; Carmona-Torre, Francisco; Del Pozo, Jose Luis

2014-01-01

209

Urethral advancement technique for repair of distal hypospadias.  

PubMed

Eighty children with distal hypospadias were operated upon by this technique. It is a modification from the old Beck technique and is applicable only for distal types (coronal and subcoronal) with minimal chordae and rotation. The urethral meatus could be placed to the tip of the glans penis by mobilizing and advancing the urethra without constructing a neourethra. Children did not need catheterization or diversion. The average hospital stay was 2 days. Success rate was 98%. Children who developed fistulae were treated by simple closure of the defect. PMID:2318238

Wishahi, M M; Wishahy, M K; Kaddah, N

1990-01-01

210

Validation of the Use of Nonnaive Surgically Catheterized Rats for Pharmacokinetics Studies  

PubMed Central

Although large animals, such as dogs and nonhuman primates, often are used for more than 1 pharmacokinetics study, common practice is to use only naive rodents for pharmacokinetics studies. We undertook a series of studies to validate whether surgically cannulated nonnaive rats could be used again after a 7-d washout. When vascular catheters are cared for appropriately, we find that they remain patent for more than 2 wk, with negligible drug carryover. Hematocrit decreased approximately 11% after pharmacokinetics studies but rebounded to prestudy levels after a 7-d washout. We empirically tested whether drugs known to alter drug disposition (1-aminobenzotriazole and quinidine) had residual effects on drug disposition after a 7-d washout and found that they did not. This finding suggests that after a 7-d washout, nonnaive rats likely would produce pharmacokinetics data similar to those of naive rats. We also tested reference compounds in naive and nonnaive rats and found no difference in pharmacokinetics parameters. Using surgically cannulated rats for a second study was feasible because of the relatively noninvasive nature of pharmacokinetics sampling (unrestrained rats attached to automated blood samplers). In addition, reusing surgically altered animals yields considerable cost savings. Our studies indicate that pharmacokinetics parameters did not differ significantly between naive and nonnaive rats. Cost–benefit analysis, monetary considerations, and validation studies support using rats for a second study after a 7-d washout period. PMID:19049252

Deshmukh, Sujal V; Durston, Jessica; Shomer, Nirah H

2008-01-01

211

Fast Catheter Segmentation from Echocardiographic Sequences based on Segmentation from Corresponding X-ray Fluoroscopy for Cardiac Catheterization Interventions.  

PubMed

Echocardiography is a potential alternative to X-ray fluoroscopy in cardiac catheterization given its richness in soft tissue information and its lack of ionizing radiation. However, its small field of view and acoustic artifacts make direct automatic segmentation of the catheters very challenging. In this study, a fast catheter segmentation framework for echocardiographic imaging guided by the segmentation of corresponding X-ray fluoroscopic imaging is proposed. The complete framework consists of: (1) catheter initialization in the first X-ray frame; (2) catheter tracking in the rest of the X-ray sequence; (3) fast registration of corresponding X-ray and ultrasound frames; and (4) catheter segmentation in ultrasound images guided by the results of both X-ray tracking and fast registration. The main contributions include: (1) a Kalman filter-based growing strategy with more clinical data evalution; (2) a SURF detector applied in a constrained search space for catheter segmentation in ultrasound images; (3) a two layer hierarchical graph model to integrate and smooth catheter fragments into a complete catheter; and (4) the integration of these components into a system for clinical applications. This framework is evaluated on 5 sequences of porcine data and 4 sequences of patient data comprising more than 3000 X-ray frames and more than 1000 ultrasound frames. The results show that our algorithm is able to track the catheter in ultrasound images at 1.3 seconds per frame, with an error of less than 2 mm. However, although this may satisfy the accuracy for visualization purposes and is also fast, the algorithm still needs to be further accelerated for real-time clinical applications. PMID:25291790

Wu, Xianliang; Housden, James; Ma, Yingliang; Razavi, Benjamin; Rhode, Kawal; Rueckert, Daniel

2014-09-30

212

Pulmonary alveolar hemorrhage from a pulmonary artery false aneurysm after Swan-Ganz catheterization in a thoracic aortic aneurysm patient: a case report  

PubMed Central

Pulmonary artery (PA) rupture caused by a PA Swan-Ganz catheter is a rare complication but remains fatal in almost 50% of cases. False aneurysm of the PA is a rare presentation of PA rupture and should be considered as a possible diagnosis in a patient with a new lung mass after PA catheterization. We present a case of sudden-onset pulmonary alveolar hemorrhage during cardiovascular surgery due to a traumatic PA false aneurysm. The Swan-Ganz catheter might have been displaced by the thoracic aortic aneurysm with displacement of the catheter causing the false aneurysm and bleeding. PMID:25473465

Ikeno, Shigeo; Tsuchihashi, Tetsuya; Yokota, Shigeru; Ina, Hiroaki; Kono, Tetsuya; Yamashita, Kunihiko; Kawamata, Mikito

2014-01-01

213

Catheterized guinea pigs infected with Ebola Zaire virus allows safer sequential sampling to determine the pharmacokinetic profile of a phosphatidylserine-targeting monoclonal antibody.  

PubMed

Sequential sampling from animals challenged with highly pathogenic organisms, such as haemorrhagic fever viruses, is required for many pharmaceutical studies. Using the guinea pig model of Ebola virus infection, a catheterized system was used which had the benefits of allowing repeated sampling of the same cohort of animals, and also a reduction in the use of sharps at high biological containment. Levels of a PS-targeting antibody (Bavituximab) were measured in Ebola-infected animals and uninfected controls. Data showed that the pharmacokinetics were similar in both groups, therefore Ebola virus infection did not have an observable effect on the half-life of the antibody. PMID:23165089

Dowall, Stuart; Taylor, Irene; Yeates, Paul; Smith, Leonie; Rule, Antony; Easterbrook, Linda; Bruce, Christine; Cook, Nicola; Corbin-Lickfett, Kara; Empig, Cyril; Schlunegger, Kyle; Graham, Victoria; Dennis, Mike; Hewson, Roger

2013-02-01

214

Self catheterization - male  

MedlinePLUS

... be sterile, just clean. Rinse it again with cold water. Hang the catheter over a towel to dry. When it is dry, store the catheter in a new plastic bag. Throw away the catheter when it becomes dry and brittle.

215

Self catheterization - female  

MedlinePLUS

... be sterile, just clean. Rinse it again with cold water. Hang the catheter over a towel to dry. When it is dry, store the catheter in a new plastic bag. Throw away the catheter when it becomes dry and brittle.

216

Radial Artery Catheterization  

MedlinePLUS

... because of a blood clot forming in the artery. Blood thinners given during the procedure help to prevent ... in less than 2% of cases. When radial artery occlusion does occur, it generally causes no issue for the hand because there are redundant blood supplies to the hand. Previous Section Next Section ...

217

Nursing students' self-evaluation using a video recording of foley catheterization: effects on students' competence, communication skills, and learning motivation.  

PubMed

An opportunity for a student to evaluate his or her own performance enhances self-awareness and promotes self-directed learning. Using three outcome measures of competency of procedure, communication skills, and learning motivation, the effects of self-evaluation using a video recording of the student's Foley catheterization was investigated in this study. The students in the experimental group (n = 20) evaluated their Foley catheterization performance by reviewing the video recordings of their own performance, whereas students in the control group (n = 20) received written evaluation guidelines only. The results showed that the students in the experimental group had better scores on competency (p < 0.001), communication skills (p < 0.001), and learning motivation (p = 0.018) than the control group at the post-test, which was conducted 8 weeks after the pretest. Self-awareness of one's own performance developed by reviewing a videotape appears to increase the competency of clinical skills in nursing students. PMID:20411863

Yoo, Moon Sook; Yoo, Il Young; Lee, Hyejung

2010-07-01

218

[Blood reflux through the catheter when trying catheterization of the subclavian vein is not a reliable sign in case of hemothorax].  

PubMed

A 36-year-old man suffered chest and neurovascular trauma, soft-tissue injury to the left arm, and trauma to facial bones and extremities. He was hemodynamically unstable and responded poorly to blood transfusion and vasoactive medication. Pneumothorax was suspected. When a tube was inserted into the left hemithorax, 1500 mL of blood was drained. A chest film revealed hemothorax and a contusion on the left lung, but no rib fractures. An attempt to catheterize the left subclavian vein yielded reflux, and blood was then transfused. The patient continued to be highly unstable and an additional 1000 mL of blood was drained. Exploratory thoracotomy revealed a ruptured subclavian vein, location of the venous catheter in the pleural cavity, and a fracture of the first left rib. After chest injury leading to hemothorax, reflux upon catheterization of the ipsilateral subclavian vein is not a sure sign of correct tip placement. Additional means for checking placement, such as assessing pressure wave morphology, should be used. A fracture of the first rib, which may not be evident on a chest x-ray, often causes a vascular lesion and thoracic hemorrhage. Incorrect insertion of a subclavian catheter may then follow. PMID:12516494

del Castillo Fernández, de Betoño T; Pulido Oleaga, C; Gago, S; Zaballos, M; Garutti, I; de Lucas, E García

2002-11-01

219

The Effects of Ranitidine and Hydrocortisone on the Complications of Femoral Artery Obstruction Treated by Streptokinase Following Cardiac Catheterization in Pediatric Patients with Congenital Heart Diseases  

PubMed Central

Background: The most important complication following cardiac catheterization required urgent therapeutic management is vessel obstruction and arterial thrombosis. The morbidity following this complication can be decreased by surgery intervention and/or thrombolytic drugs. Objectives: In this study we evaluated the effects of ranitidine and hydrocortisone on pediatric patients with congenital heart diseases who suffered from femoral artery obstruction following cardiac catheterization on decreasing the events after streptokinase administration. Materials and Methods: This semi experimental study was conducted on 47 patients among 600 cases who underwent cardiac catheterization from April 2002 to December 2011.The patients suffered from distal vessel obstruction following cardiac catheterization with no response to surgery intervention, were enrolled and divided in two groups. Streptokinase was administrated in both groups. Patients in group 2 (25 cases), received ranitidine and hydrocortisone before streptokinase administration. In group 1 (22 cases), the loading dose of streptokinase was 2000IU/kg/ in 20-30 minutes/ infusion and thereafter streptokinase was administrated 1000 IU /kg/hour. In group 2, the loading dose was 3000IU/kg in 20-30 minutes /infusion and 1500 IU/kg/hour as maintenance dose. The infusion dose of streptokinase was decreased and then terminated in 2-3 hours by the time arterial pulse was detected by pulse oximetry. Results: There were 13 (59, 1%) male and 9 (40.9%) female patients in group 1. In group 2, there were 15 (60%) male and 10 (40%) female cases (P = 0.949). Patients in both groups were matched well regarding age, body weight, height and the duration of streptokinase infusion (P < 0.05). The incidence of hematoma was higher in group 1 than group 2 (P = 0.032). the patients of Group 1 required more blood transfusion than group 2 because the incidence of bleeding was more in the first group (P = 0.042). 12 patients in group 1 required fresh frozen plasma transfusion versus 4 patients in group 2 (P = 0.049). Local oozing was detected more in group 1 (P = 0.042). Significant bleeding was occurred in 6 cases in group 1; however this event did not occurrin any patients in group 2 (P = 0.007). Although 4 patients in group 1 suffered from anaphylactic shock after streptokinase administration but no patients in group 2 did. (P = 0.041). Conclusions: Based on the results of this study, we concluded that streptokinase was able to remove the vessel thrombosis at the site of cardiac catheterization and ranitidine and hydrocortisone administration before streptokinase may be effective in order to reduce the complications related to thrombolytic drugs; however the experience of the performer is an issue of concern in this matter. PMID:24693416

Noori, Noormohammad; Miri Aliabad, Ghasem; Mohammadi, Mehdi; Mahjoubifard, Maziar; Jahangiri Fard, Alireza

2013-01-01

220

Coronary arteriography and angioplasty  

SciTech Connect

This book explores biomedical radiography of the heart. Topics considered include six bench marks in the history of cardiac catheterization; normal coronary anatomy; anomalies of the coronary arteries; pathoanotomy of the coronary arteries and complications; indications, limitations, and risks of coronary arteriography and left ventriculography; catheterization techniques in coronary arteriography and left ventriculography: the Sones technique; catheterization techniques in coronary arteriography and left ventriculography: the Judkins technique; modification of Judkins catheters; catheterization techniques in coronary arteriography and left ventriculography multipurpose technique; new views in coronary arteriography; quantitative evaluation of left ventricular function; complications of coronary arteriography: management during and following the procedure; interpretation of coronary arteriograms and left ventriculograms; prevalence and distribution of disease in patients catheterized for suspected coronary disease at Emory University Hospital; the Cardiac Catheterization Laboratory; selection for surgery or percutaneous transluminal coronary angioplasty; intracoronary thrombolysis; and percutaneous transluminal coronary angioplasty.

King, S.B.; Douglas, J.S.

1985-01-01

221

Is the intraosseous access route fast and efficacious compared to conventional central venous catheterization in adult patients under resuscitation in the emergency department? A prospective observational pilot study  

PubMed Central

Background For patients' safety reasons, current American Heart Association and European Resuscitation Council guidelines recommend intraosseous (IO) vascular access as an alternative in cases of emergency, if prompt venous catheterization is impossible. The purpose of this study was to compare the IO access as a bridging procedure versus central venous catheterization (CVC) for in-hospital adult emergency patients under resuscitation with impossible peripheral intravenous (IV) access. We hypothesised, that CVC is faster and more efficacious compared to IO access. Methods A prospective observational study comparing success rates and procedure times of IO access (EZ-IO, Vidacare Corporation) versus CVC in adult (?18 years of age) patients under trauma and medical resuscitation admitted to our emergency department with impossible peripheral IV catheterization was conducted. Procedure time was defined from preparation and insertion of vascular access type until first drug or infusion solution administration. Success rate on first attempt and procedure time for each access route was evaluated and statistically tested. Results Ten consecutive adult patients under resuscitation, each receiving IO access and CVC, were analyzed. IO access was performed with 10 tibial or humeral insertions, CVC in 10 internal jugular or subclavian veins. The success rate on first attempt was 90% for IO insertion versus 60% for CVC. Mean procedure time was significantly lower for IO cannulation (2.3 min ± 0.8) compared to CVC (9.9 min ± 3.7) (p < 0.001). As for complications, failure of IO access was observed in one patient, while two or more attempts of CVC were necessary in four patients. No other relevant complications, like infection, bleeding or pneumothorax were observed. Conclusion Preliminary data demonstrate that IO access is a reliable bridging method to gain vascular access for in-hospital adult emergency patients under trauma or medical resuscitation with impossible peripheral IV access. Furthermore, IO cannulation requires significantly less time to enable administration of drugs or infusion solutions compared to CVC. Because CVC was slower and less efficacious, IO access may improve the safety of adult patients under resuscitation in the emergency department. PMID:19814822

Leidel, Bernd A; Kirchhoff, Chlodwig; Bogner, Viktoria; Stegmaier, Julia; Mutschler, Wolf; Kanz, Karl-Georg; Braunstein, Volker

2009-01-01

222

Biological Indicators of Watershed Health  

NSDL National Science Digital Library

This recently launched site on biological indicators, from the Environmental Protection Agency, is a gem, offering basic yet critical information on the what, where, why, and how of biological indicators. Presented in straightforward language, the site sets out to educate viewers about the importance of biological indicators -- those organisms that, because of their sensitivity to changes in the environment, "can provide accurate information about the health of a specific river, stream, lake, wetland, or estuary." The site is organized into seven main sections: Why use Indicators?, Key Concepts, Learn About State Programs, Biocriteria Resources, Fish as Indicators, Invertebrates as Indicators, and Periphyton as Indicators. In each section, a series of brief statements (with accompanying color photographs) leads the viewer through the logic, techniques, and methods used to assess watershed health. A collection of links rounds out the site.

223

A randomized, double-blind, placebo-controlled comparison of the effect of nitrofurantoin monohydrate macrocrystals on the development of urinary tract infections after surgery for pelvic organ prolapse and\\/or stress urinary incontinence with suprapubic catheterization  

Microsoft Academic Search

ObjectiveThe purpose of this study was to determine if antibiotic prophylaxis with nitrofurantoin monohydrate macrocrystals (study drug) after pelvic organ prolapse and\\/or urinary incontinence surgery with suprapubic catheterization (SPC) decreases urinary tract infection (UTI) compared with placebo in a randomized, double-blind, multicenter trial.

Rebecca G Rogers; Dorothy Kammerer-Doak; Ambre Olsen; Peter K Thompson; Mark D Walters; E. S Lukacz; Clifford Qualls

2004-01-01

224

[Surgical indications in aspecific pneumopathies].  

PubMed

A degree course lecture based on a review of the relevant literature and experience gained at a 1000-bed lung hospital (S. Luigi Hospital, Orbassano) is presented in a shortened form. Attention is drawn to the revival of discarded techniques due to anaesthesiological and medical advances. This has considerably extended the surgical indications. PMID:673214

Dei Poli, G; Mello Teggia, P; Smrekar, E; Mastroianni, V

225

ECOLOGICAL PERFORMANCE INDICATORS  

EPA Science Inventory

EMAP has traditionally relied on indicators of ecological condition to report on the extent to which coastal waters are impaired. Correlations between biological indicators and physical or chemical indicators may generate hypotheses about potential causes of impairment but are n...

226

Reliability of Noninvasive Assessment of Systolic Pulmonary Artery Pressure by Doppler Echocardiography Compared to Right Heart Catheterization: Analysis in a Large Patient Population  

PubMed Central

Background Pulmonary artery pressure (PAP) is an important marker in cardiovascular disorders, being closely associated with morbidity and mortality. Noninvasive assessment by Doppler echocardiography is recommended by current guidelines. So far, the reliability of this method has been assessed only in small studies with contradictory results. Therefore, the aim of this study was to analyze the reliability of noninvasive PAP assessment by Doppler echocardiography compared to invasive measurements in a large patient population. Methods and Results We retrospectively analyzed data from a large tertiary cardiology department over 6 years in order to compare invasively measured PAP to estimated PAP from echocardiography examinations. N=15 516 patients fulfilled inclusion criteria and n=1695 patients with timely matched examinations (within 5 days) were analyzed. In n=1221 (72%) patients, pulmonary hypertension (PH) was diagnosed invasively (postcapillary PH: n=1122 [66%]; precapillary PH: n=99 [6%]). Systolic pulmonary artery pressure (sPAP) was 45.3±15.5 mm Hg by Doppler echocardiography and 47.4±16.4 mm Hg by right heart catheterization. Pearson's correlation coefficient was r=0.87 (P<0.0001). Mean right atrial pressure (RAP) was 12.0±5.7 mm Hg by right heart catheterization and was estimated to be 12.1±6.6 mm Hg by echocardiography (r=0.82, P<0.0001). Bland–Altman analysis showed a bias of ?2.0 mm Hg for sPAP (95% limits of agreement ?18.1 to +14.1 mm Hg) and +1.0 mm Hg for RAP (95% limits of agreement +0.1 to +1.9 mm Hg). Noninvasive diagnosis of pulmonary hypertension with Doppler echocardiography had a good sensitivity (87%) and specificity (79%), positive and negative predictive values (91% and 70%), as well as accuracy (85%) for a sPAP cut?off value of 36 mm Hg (AUC 0.91, P<0.001, CI 0.90 to 0.93). Conclusions In this study, Doppler echocardiography proved to be a reliable method for the assessment of sPAP, being well suited to establish the noninvasive diagnosis of pulmonary hypertension in patients with cardiac diseases. PMID:25146706

Greiner, Sebastian; Jud, Andreas; Aurich, Matthias; Hess, Alexander; Hilbel, Thomas; Hardt, Stefan; Katus, Hugo A.; Mereles, Derliz

2014-01-01

227

Stent-grafts in the management of life-threatening hemorrhage following inadvertent femoral catheterization in high-risk patients: report of two cases and review of the literature  

PubMed Central

Bleeding related to inadvertent femoral catheter insertion is an infrequent but morbid complication. We report two cases of acute life-threatening bleeding after attempts at femoral vein catheterization. Both patients were morbidly obese, had multiple comorbidities, and were at high risk for surgical intervention. Aggressive resuscitation failed to stabilize the patients. Emergency digital subtraction angiography diagnosed the site of the femoral artery bleeding. In one patient, the site of injury was the right profunda femoris artery. Both bleeding sites were controlled successfully with endovascular covered stent placement, without complication. Although prior publications have reported the concept of endovascular repair in femoral artery injuries, to the best of the author’s knowledge, covering the profunda femoris artery with no complications has not been described previously. In critically ill patients with life-threatening hemorrhage following inadvertent femoral catheterization, management with endovascular covered stents is safe and effective. PMID:21191431

Al Wahbi, Abdullah

2010-01-01

228

Stent-grafts in the management of life-threatening hemorrhage following inadvertent femoral catheterization in high-risk patients: report of two cases and review of the literature.  

PubMed

Bleeding related to inadvertent femoral catheter insertion is an infrequent but morbid complication. We report two cases of acute life-threatening bleeding after attempts at femoral vein catheterization. Both patients were morbidly obese, had multiple comorbidities, and were at high risk for surgical intervention. Aggressive resuscitation failed to stabilize the patients. Emergency digital subtraction angiography diagnosed the site of the femoral artery bleeding. In one patient, the site of injury was the right profunda femoris artery. Both bleeding sites were controlled successfully with endovascular covered stent placement, without complication. Although prior publications have reported the concept of endovascular repair in femoral artery injuries, to the best of the author's knowledge, covering the profunda femoris artery with no complications has not been described previously. In critically ill patients with life-threatening hemorrhage following inadvertent femoral catheterization, management with endovascular covered stents is safe and effective. PMID:21191431

Al Wahbi, Abdullah

2010-01-01

229

Genetic determination of high-density lipoprotein-cholesterol and apolipoprotein A-1 plasma levels in a family study of cardiac catheterization patients.  

PubMed Central

Plasma levels of two lipoprotein risk factors, high-density lipoprotein-cholesterol (HDL-C) and apolipoprotein A-1 (apo A-1), have been shown to be negatively associated with the risk of developing coronary artery disease, and several reports have examined familial factors in HDL-C and apo A-1 levels. A number of studies suggest that shared genes influence familial resemblance of these lipoprotein levels far more than do shared environments. Possible mechanisms for the inheritance of these two risk factors (HDL-C and apo A-1 plasma levels) are explored using data from 390 individuals in 69 families ascertained through probands undergoing diagnostic cardiac catheterization. Segregation analysis was used to test a series of specific models of inheritance. Evidence for single-locus control of apo A-1 levels, with Mendelian transmission of a dominant allele leading to elevated apo A-1 levels, was seen in these families, although there was additional correlation among sibs present. This locus accounted for 48.6% and 37.2% of the total variation in apo A-1 levels in males and females, respectively. Similar evidence of segregation at a single locus controlling HDL-C levels was not seen in these families. PMID:1415250

Prenger, V L; Beaty, T H; Kwiterovich, P O

1992-01-01

230

Environmental Treaties and Indicators Resource Indicators  

NSDL National Science Digital Library

ENTRI is an international, collaborative effort hosted by the Consortium for International Earth Science Information Network (CIESIN) charged with providing "information about environmental treaties and national resource indicators." These treaties are organized into nine issue areas which cover land use change and desertification, transboundary air pollution, and trade and the environment, among others. Treaties can be searched or browsed. Free text searching of the treaties and treaty summaries is also available.

231

Trapped Microcatheter from Vessel Spasm: Safe Removal after Double Microcatheter Technique and Local Papaverine Infusion  

PubMed Central

Summary In a child undergoing combined transarterial and direct percutaneous puncture embolization of an extensive and complex facial arteriovenous malformation, severe arterial spasm fixed a flow-directed microcatheter in an ethmoidal branch of the left ophthalmic artery. Multiple traction attempts failed to remove the microcatheter. After catheterization of the distal, post central retinal artery part of the same ophthalmic artery, with a second flow-directed microcatheter and following intraarterial papaverine injection through this second microcatheter, the fixed microcatheter could be removed without complication. This case demonstrates a technique that can be attempted before deciding to leave the microcatheter in the patient or to remove it surgically. PMID:20569554

Celedin, S.; Song, J.K.; Valavanis, A.

2006-01-01

232

Fluid leak indicator  

NASA Technical Reports Server (NTRS)

A fluid leak indicator (30) for detecting and indicating leaks in visually inaccessible fluid tubing joints (20, 21), such as those obstructed by insulation (24), includes a bag system (25) and a wicking system (30) surrounding or wrapping the joints (20, 21) under the visual obstructing material (24). Leaking fluid is collected in the bag (25) or on the wicking material (34) where it is conducted along the wicking material (34) to a visibly accessible capturing transparent indicator bulb (35) for providing a visual indication of the leak without requiring a chemical change in the capturing indicator bulb (35).

Anderson, George E. (Inventor); Loo, Shu (Inventor)

1989-01-01

233

Fluid leak indicator  

NASA Technical Reports Server (NTRS)

A fluid leak indicator for detecting and indicating leaks in visually inaccessible fluid tubing joints, such as those obstructed by insulation includes a bag system and a wicking system surrounding or wrapping the joints under the visual obstructing material. Leaking fluid is collected in the bag or on the wicking material where it is conducted along the wicking material to a visily accessible capturing transparent indicator bulb for providing a visual indication of the leak without requiring a chemical change in the capturing indicator bulb.

Anderson, G. E.; Loo, S. (inventors)

1985-01-01

234

Prognostic value of angiographic lesion complexity in patients with acute coronary syndromes undergoing percutaneous coronary intervention (from the acute catheterization and urgent intervention triage strategy trial).  

PubMed

Although lesion complexity is predictive of outcomes after balloon angioplasty, it is unclear whether complex lesions continue to portend a worse prognosis in patients with acute coronary syndrome (ACS) undergoing percutaneous coronary intervention (PCI) with contemporary interventional therapies. We sought to assess the impact of angiographic lesion complexity, defined by the modified American College of Cardiology/American Heart Association classification, on clinical outcomes after PCI in patients with ACS and to determine whether an interaction exists between lesion complexity and antithrombin regimen outcomes after PCI. Among the 3,661 patients who underwent PCI in the Acute Catheterization and Urgent Intervention Triage strategy study, patients with type C lesions (n = 1,654 [45%]) had higher 30-day rates of mortality (1.2% vs 0.6%, p = 0.049), myocardial infarction (9.2% vs 6.3%, p = 0.0006), and unplanned revascularization (4.3% vs 3.1%, p = 0.04) compared with those without type C lesions. In multivariate analysis, type C lesions were independently associated with myocardial infarction (odds ratio [95% confidence interval] = 1.37 [1.04 to 1.80], p = 0.02) and composite ischemia (odds ratio [95% confidence interval] = 1.49 [1.17 to 1.88], p = 0.001) at 30 days. Bivalirudin monotherapy compared with heparin plus a glycoprotein IIb/IIIa inhibitor reduced major bleeding complications with similar rates of composite ischemic events, regardless of the presence of type C lesions. There were no interactions between antithrombotic regimens and lesion complexity in terms of composite ischemia and major bleeding (p [interaction] = 0.91 and 0.80, respectively). In conclusion, patients with ACS with type C lesion characteristics undergoing PCI have an adverse short-term prognosis. Treatment with bivalirudin monotherapy reduces major hemorrhagic complications irrespective of lesion complexity with comparable suppression of adverse ischemic events as heparin plus glycoprotein IIb/IIIa inhibitor. PMID:25312637

Goto, Kenji; Lansky, Alexandra J; Ng, Vivian G; Pietras, Cody; Nargileci, Erol; Mehran, Roxana; Parise, Helen; Feit, Frederick; Ohman, E Magnus; White, Harvey D; Bertrand, Michel E; Desmet, Walter; Hamon, Martial; Stone, Gregg W

2014-12-01

235

Indicators of Quality.  

ERIC Educational Resources Information Center

Surveyed students, faculty, administrative staff, governing board, and employers affiliated with a public two-year college to determine their perceptions of various quality indicators and congruence between the groups. Found that all groups placed importance on indicators of customer satisfaction and skill development; beyond that, considerable…

Cleary, Thomas S.

2001-01-01

236

School Readiness Indicator Items.  

ERIC Educational Resources Information Center

This report provides a compilation of indicators of school readiness used in national, state, and local surveys in the United States, delineating the advantages and disadvantages for each indicator. The report begins with a legend to assist in interpreting the tables and includes contact information for national and state surveys. The remainder of…

Calkins, Julia; Ling, Thomson; Moore, Eric; Halle, Tamara; Hair, Beth; Moore, Kris; Zaslow, Marty

237

Cobb's Red Cabbage Indicator.  

ERIC Educational Resources Information Center

Describes the use of an indicator made from the pigment in red cabbage. Cabbage is grated then soaked in water. When the water is a strong red, the cabbage is strained out. The cabbage-juice indicator is then used to test for acids and bases. Includes a list of good foods to test for acidity and alkalinity. (PVD)

Cobb, Vicki

1998-01-01

238

Quality Indicator System Report.  

ERIC Educational Resources Information Center

This report is a product of the implementation of a quality indicator system for Colorado's public higher education system. In 1999, the Colorado Commission on Higher Education established a core set of nine indicators, for which data were gathered and benchmarks were identified for measuring performance in terms of these benchmarks. The first…

Colorado Commission on Higher Education, Denver.

239

General Indicators: Performance Statistics  

E-print Network

General Indicators: Performance Statistics Current Month Change from Previous Month Recent Trend for descriptions of performance measures and specific color code target values. Trend status color indicators Initial Target St. Paul - West Health Science East Bank Central Svcs. Energy Mgmt Admin Safety: Lost Time

Webb, Peter

240

General Indicators: Performance Statistics  

E-print Network

General Indicators: Performance Statistics Current Month Change from Previous Month Recent Trend of performance measures and specific color code target values. Trend status color indicators ­ identifies changes Initial Target St. Paul - West Health Science East Bank Central Svcs. Energy Mgmt Admin Safety: Lost Time

Webb, Peter

241

[Thermoablative therapy of hepatocellular carcinoma. Indications, technique and results].  

PubMed

Hepatocellular carcinoma (HCC) is one of the most frequent malignancies worldwide. Besides liver transplantation, which is only feasible in few patients and surgical resection, the scope of potential treatment options has considerably expanded in recent years. Thermoablative therapies are now well established in early HCC due to the low rate of complications and short hospital stay. The disadvantage of higher relapse rates compared to surgical resection will be further diminished through technical advances regarding radiofrequency ablation and microwave ablation, as well as growing experience of users and thorough multidisciplinary selection of potential candidates for thermoablative therapy. PMID:24981447

Hofmockel, T; Plodeck, V; Laniado, M; Hoffmann, R-T

2014-07-01

242

The Huckstep intramedullary compression nail. Indications, technique, and results.  

PubMed

A four-sided, intramedullary compression nail of solid titanium alloy has been developed since 1967. This nail is 12.5 mm in diameter with 4.5-mm transverse holes at 15-mm intervals, for 4-mm fine threaded screws. It has four oblique holes in the proximal end to allow 4.5-mm lag screws to be inserted up the femoral neck. A compressor over the trochanter can be used for compression in transverse fractures. Advantages include inert titanium alloy, which is stronger than the average femoral shaft, a recessed end of the nail, reaming to only 13 mm, and a quadrilateral shape. No operative roentgenograms are usually required. Comminuted, oblique, and infected fractures of the entire length of the femoral shaft down to the supracondylar region can be held rigidly, usually allowing for immediate weight-bearing. The femur can be lengthened or shortened with compression and the knee can be arthrodesed with a 60-cm nail. One hundred twenty-two nails inserted since 1974 included 32 comminuted or oblique acute femoral fractures. Forty-two patients had had failure of other implants. Among these, 34 had nonunion for one year and 17 nonunion for more than three years. Fifty-one bones in 47 patients were stabilized for pathologic fractures and other conditions. Complications were minimal. PMID:3769297

Huckstep, R L

1986-11-01

243

Cabbage Juice Indicator  

NSDL National Science Digital Library

In this chemistry activity, learners make indicator solution from red cabbage. Then, learners test everyday foods and household substances using the cabbage juice indicator. Learners will record the color change, approximate pH (using the pH scale), and identify if it is an acid or base. As an extension, learners can make pH paper strips to conduct an "at home" pH test of other household items. The indicator solution can be frozen in ice trays and when mixed with alcohol, can last for months. For safety reasons, adult supervision is recommended.

The Science House

2014-01-28

244

Spine: Minimally Invasive Techniques  

Microsoft Academic Search

Minimally invasive spine surgery decompression, arthrodesis, and instrumentation techniques are now being applied in a wide variety of percutaneous, laparoscopic and minimal access procedures. There is currently little longitudinal long-term data on these procedures to document their efficacy, indications, limitations or complications as compared to standard open techniques. Further complicating such direct comparisons is that widely used spine outcomes instruments

P. Gerszten; W. Welch

2006-01-01

245

ENVIRONMENTAL PUBLIC HEALTH INDICATORS  

EPA Science Inventory

Environmental Public Health Indicators (EPHIs), quantitative measures of health factors and environmental influences tracked over time, can be used to identify specific areas and populations for intervention and prevention efforts and to evaluate the outcomes of implemented polic...

246

Position indicating, rotating boom  

NASA Technical Reports Server (NTRS)

Universal multiplanar position indicating, rotating boom for mounting various instruments or sensors is described. Boom is telescoping, and apparatus is capable of 3 types of rotation controlled by electric motors. Movement may be continuous or incremental.

Dibble, A. C.; Gibson, F. W.; Padelt, J. R.; Saunders, W. S.

1972-01-01

247

ENSO indices and analyses  

NASA Astrophysics Data System (ADS)

New ENSO indices were developed and the spatial variability and temporal evolution of ENSO were analyzed based on the new indices and modeling experiments, as well as multiple data resources. The new indices, after being defined, were validated with their good diagnostic characteristics and correlation with wind and SST. In the analysis after the definition and validation of the new indices, ENSO feedbacks from wind, heat fluxes, and precipitation were spatially and temporally examined in order to understand ENSO variability and evolution with some emphasized points such as the interaction among the feedbacks, the role of westerly wind bursts and the transformation between zonal and meridional circulations in an ENSO cycle, and the typical pattern of modern ENSO.

Wang, Zhiren; Wu, Dexing; Chen, Xue'en; Qiao, Ran

2013-09-01

248

New England Economic Indicators  

NSDL National Science Digital Library

New England Economic Indicators, a monthly publication from the Federal Reserve Bank of Boston, contains articles on subjects including labor market conditions, consumer prices, consumer confidence, and electricity sales.

249

Aggregating Governance Indicators  

Microsoft Academic Search

October 1999With the right method, aggregate indicators can provide useful estimates of basic governance concepts as well as measures of the imprecision of these aggregate estimates and their components.In recent years the growing interest of academics and policymakers in governance has been reflected in the proliferation of cross-country indices measuring various aspects of governance.Kaufmann, Kraay, and Zoido-Lobat?n explain how a

Pablo Zoido-Lobaton; Daniel Kaufmann

1999-01-01

250

Effect of anemia on frequency of short- and long-term clinical events in acute coronary syndromes (from the Acute Catheterization and Urgent Intervention Triage Strategy Trial).  

PubMed

There are limited data on the impact of anemia on clinical outcomes in unstable angina and non-ST-segment elevation myocardial infarction treated with an early invasive strategy. We sought to determine the short- and long-term clinical events among patients with and without anemia enrolled in the Acute Catheterization and Urgent Intervention Triage Strategy (ACUITY) trial. Anemia was defined as baseline hemoglobin of <13 g/dl for men and <12 g/dl for women. The primary end points were composite ischemia (death, myocardial infarction, or unplanned revascularization for ischemia) and major bleeding assessed in-hospital, at 1 month, and at 1 year. Among the 13,819 patients in the ACUITY trial, information regarding anemia was available in 13,032 (94.3%), 2,199 of whom (16.9%) had anemia. Patients with anemia compared with those without anemia had significantly increased adverse event rates in-hospital (composite ischemia 6.6% vs 4.8%, p = 0.0004; major bleeding 7.3% vs 3.3%, p <0.0001), at 1 month (composite ischemia 10% vs 7.2%, p <0.0001, major bleeding 8.8% vs 3.9%, p <0.0001), and 1 year (composite ischemia 21.7% vs 15.3%, p <0.0001). Anemia was an independent predictor of death at 1 year (hazard ratio 1.77, 95% confidence interval [CI] 1.29 to 2.44, p = 0.0005). Composite ischemia was significantly more common among patients who developed in-hospital non-coronary artery bypass surgery major bleeding compared with those who did not (anemic patients 1-year relative risk 2.19, 95% CI 1.67 to 2.88, p <0.0001; nonanemic patients relative risk 2.16, 95% CI 1.76 to 2.65, p <0.0001). In conclusion, in the ACUITY trial, baseline anemia was strongly associated with adverse early and late clinical events, especially in those who developed major bleeding. PMID:25438908

Kunadian, Vijay; Mehran, Roxana; Lincoff, A Michael; Feit, Frederick; Manoukian, Steven V; Hamon, Martial; Cox, David A; Dangas, George D; Stone, Gregg W

2014-12-15

251

Indicator Systems and Evaluation  

NASA Technical Reports Server (NTRS)

Participants in the workshop session were actively engaged in a hands-on, minds-on approach to learning about indicators and evaluation processes. The six hour session was broken down into three two hour sessions. Each session was built upon an instructional model which moved from general understanding to specific IITA application. Examples and practice exercises served to demonstrate tand reinforce the workshop concepts. Each successive session built upon the previous session and addressed the major steps in the evaluation process. The major steps covered in the workshop included: project descriptions, writing goals and objectives for categories, determining indicators and indicator systems for specific projects, and methods and issues of data collection. The workshop served as a baseline upon which the field centers will build during the summer in undertaking a comprehensive examination and evaluation of their existing K-12 education projects.

Canright, Shelley; Grabowski, Barbara

1995-01-01

252

Enzymatic temperature change indicator  

DOEpatents

A temperature change indicator is described which is composed of an enzyme and a substrate for that enzyme suspended in a solid organic solvent or mixture of solvents as a support medium. The organic solvent or solvents are chosen so as to melt at a specific temperature or in a specific temperature range. When the temperature of the indicator is elevated above the chosen, or critical temperature, the solid organic solvent support will melt, and the enzymatic reaction will occur, producing a visually detectable product which is stable to further temperature variation.

Klibanov, Alexander M. (Newton, MA); Dordick, Jonathan S. (Iowa City, IA)

1989-01-21

253

Generalization of topological indices  

NASA Astrophysics Data System (ADS)

A generalized (molecular) graph-theoretical matrix is introduced in such a way that the adjacency and distance matrices of (molecular) graphs are particular cases of it. By using this matrix, two new molecular graph-theoretical vectors and a vector-matrix-vector multiplication procedure, a generalized invariant is introduced. This invariant permits a generalization of some of the classical topological indices (TIs). Thus, Wiener W index, Zagreb M1 and M2 indices, Balaban J index, Harary H number, Randic ? index and valence connectivity index ?v resulted as particular cases of an infinite set of molecular descriptors that can be derived from the same invariant.

Estrada, Ernesto

2001-03-01

254

Tardigrades as Environmental Indicators  

NSDL National Science Digital Library

This essay was written by Amber, a high school senior who won the Young Naturalist Award in 2001 for her research on tardigrades (also known as water bears) as environmental bioindicators. Amber discusses how she became interested in tardigrades and her project, including sampling techniques, results, and her trip to Greenland with 15 prestigious tardigradologists from around the world. The essay includes images, data charts, and a list of references.

2009-08-10

255

"Healthy" Human Development Indices  

ERIC Educational Resources Information Center

In the Human Development Index (HDI), life expectancy is the only indicator used in modeling the dimension "a long and healthy life". Whereas life expectancy is a direct measure of quantity of life, it is only an indirect measure of healthy years lived. In this paper we attempt to remedy this omission by introducing into the HDI the morbidity…

Engineer, Merwan; Roy, Nilanjana; Fink, Sari

2010-01-01

256

Universal Indicator Rainbow Trout  

NSDL National Science Digital Library

In this activity on page 2 of the PDF, learners discover how color changes can help scientists distinguish between acids and bases. Learners create colorful rainbow trout artwork using universal indicator solution and various household liquids. Safety note: learners must wear safety goggles.

Society, American C.

2001-01-01

257

Landscape-based Indicators  

EPA Science Inventory

The report is based on data and experience gained through the GLNPO-funded Great Lakes Coastal Wetland Consortium (GLCWC) and the EPA-STAR funded Great Lakes Ecological Indicators Project (GLEI). EPA-MED author Trebitz and other MED personnel were collaborators on the GLEI proje...

258

Triboluminescent indicator system  

DOEpatents

There is provided a light emitting device comprising a plurality of triboluminescent particles dispersed throughout a low density, frangible body and activated by rapidly crushing the body in order to transfer mechanical energy to some portion of the particles. The light emitted by these mechanically excited particles is collected and directed into a light conduit and transmitted to a detector/indicator means.

Goods, Steven H. (Livermore, CA); Dentinger, Paul M. (Sunol, CA); Whinnery, Jr., Leroy L. (Danville, CA)

2003-06-24

259

Indicators for Inquiry  

NSDL National Science Digital Library

Fifth-grade students use homemade plant-based acid/base indicators to learn about matter at an age-appropriate level and develop process skills. As a result of completing this lesson sequence the students should be able to perform many tasks using process skills such as observing chemical changes; identifying acids and bases by performing tests; classifying common household substances as acidic, basic (alkaline), or neutral; and developing a scheme for solving a performance-based scenario.

Jeffery Townsend

2006-02-01

260

Tamper-indicating seal  

DOEpatents

There is disclosed a tamper-indicating seal that permits in the field inspection and detection of tampering. Said seal comprises a shrinkable tube having a visible pattern of markings which is shrunk over the item to be sealed, and a second transparent tube, having a second visible marking pattern, which is shrunk over the item and the first tube. The relationship between the first and second set of markings produces a pattern so that the seal may not be removed without detection.

Fiarman, Sidney (Port Jefferson, NY); Degen, Michael F. (Patchogue, NY); Peters, Henry F. (Brookhaven, NY)

1985-01-01

261

Modulation techniques  

NASA Technical Reports Server (NTRS)

Bandwidth efficient digital modulation techniques, proposed for use on and/or applied to satellite channels, are reviewed. In a survey of recent works on digital modulation techniques, the performance of several schemes operating in various environments are compared. Topics covered include: (1) quadrature phase shift keying; (2) offset - QPSK and MSK; (3) combined modulation and coding; and (4) spectrally efficient modulation techniques.

Schilling, D. L.

1982-01-01

262

Tamper-indicating seal  

DOEpatents

There is disclosed a tamper-indicating seal that permits in the field inspection and detection of tampering. Said seal comprises a shrinkable tube having a visible pattern of markings which is shrunk over th item to be sealed, and a second transparent tube, having a second visible marking pattern, which is shrunk over the item and the first tube. The relationship between the first and second set of markings produces a pattern so that the seal may not be removed without detection. The seal is particularly applicable to UF/sub 6/ cylinder valves.

Fiarman, S.; Degen, M.F.; Peters, H.F.

1982-08-13

263

PARTICLE ASSOCIATION EFFECTS ON MICROBIAL INDICATOR CONCENTRATIONS AND CSO DISINFECTION  

EPA Science Inventory

Combined sewer overflow (CSO) and wastewater disinfection effectiveness are evaluated by measuring microbial indicator concentrations before and after disinfection. The standard techniques for quantifying indicators are membrane filtration and multiple-tube fermentation/most pro...

264

The Boston Indicators Project  

NSDL National Science Digital Library

Coordinated by the partnership of the City of Boston, the Metropolitan Area Planning Council, and the Boston Foundation, the Boston Indicators Project "aims to democratize access to information, foster informed public discourse, track progress on shared civic goals, and report on change in 10 sectors: Civic Vitality, Cultural Life and the Arts, the Economy, Education, the Environment, Health, Housing, Public Safety, Technology, and Transportation." Visitors to the site can review the Project's most recent report as well as past versions. At the top of the page, there are various sections to visit, which cover the 10 sectors mentioned above. In each of these sections, visitors can read a brief summary, view highlights within each sector, read about the goals and measures of each sector, and find related links to research, resources, and news for each sector. The website also includes the feature "The Hub of Innovation" which highlights some of the most forward-looking local, regional, national and international work in the ten sectors tracked by the Boston Indicators Project.

265

Breathiness in Indic languages  

NASA Astrophysics Data System (ADS)

Previous work on breathiness in Indic languages has focused on the acoustic properties of breathy oral stops in languages like Hindi ([bal] hair versus [bhal] forehead) or Bengali ([baSa] house versus [bhaSa] language). However, breathiness in Indic languages often extends to nasals (e.g., Marathi ([maar] beat versus [mhaar] a caste). It is unclear if languages such as Hindi and Bengali have breathy nasals in addition to breathy oral stops. This study addresses the following questions: (1) Are breathy nasals (Nh) acoustically different from N+h sequences, both in languages where they are phonemic and ones where they are not? (2) In sequences of a breathy stop and a modal nasal (e.g., Hindi [udhmi] naughty) where is the breathiness realized, if at all? To answer these questions, audio, aerodynamic, and electroglottographic recordings will be made of Hindi, Bengali, and Marathi speakers. It is hypothesized that acoustically breathy nasals in Hindi and Bengali will not be distinct from sequences of N+ h. We believe that this will also be true for the oral stops. In addition, it is believed that in sequences of breathy oral stop followed by a modal nasal (e.g., ChN), the breathiness will be produced on the nasal.

Esposito, Christina; Khan, Sameeruddowla; Hurst, Alex

2005-04-01

266

Tamper indicating packaging  

SciTech Connect

Protecting sensitive items from undetected tampering in an unattended environment is crucial to the success of non-proliferation efforts relying on the verification of critical activities. Tamper Indicating Packaging (TIP) technologies are applied to containers, packages, and equipment that require an indication of a tamper attempt. Examples include: the transportation and storage of nuclear material, the operation and shipment of surveillance equipment and monitoring sensors, and the retail storage of medicine and food products. The spectrum of adversarial tampering ranges from attempted concealment of a pin-hole sized penetration to the complete container replacement, which would involve counterfeiting efforts of various degrees. Sandia National Laboratories (SNL) has developed a technology base for advanced TIP materials, sensors, designs, and processes which can be adapted to various future monitoring systems. The purpose of this technology base is to investigate potential new technologies, and to perform basic research of advanced technologies. This paper will describe the theory of TIP technologies and recent investigations of TIP technologies at SNL.

Baumann, M.J.; Bartberger, J.C.; Welch, T.D.

1994-08-01

267

Molecular Models of Indicators  

NSDL National Science Digital Library

The article by Nicholas C. Thomas and Stephen Faulk on "Colorful Chemical Fountains" (1) reminds us that color—the colors of acid–base indicators or of metal complexes—is responsible for many of us developing an interest in chemistry. The featured molecules this month are the acid and base forms of three common indicators–phenolphthalein, methyl orange, and methyl red. These three substances display interesting structural features as the pH-induced transformation from one form to another takes place in three different ways. In the case of phenolphthalein, the lactam ring is cleaved on deprotonation to produce a carboxyl group with the concomitant removal of a proton from a phenolic group. In methyl orange, one of the nitrogen atoms is protonated in the acid form, and that proton is lost in the base form. In methyl red, a carboxylic acid function is deprotonated. There are many other interesting aspects of acid–base indicators. Since most plants and fruits contain pigments that show a color change in some pH range, it is difficult to state with any degree of certainty when these changes were first put to use in a systematic fashion. The Spanish alchemist Arnaldus de Villa Nova (Arnold of Villanova) is purported to have used litmus in the early 14th century. In general systematic use of indicators is traced to the latter half of the nineteenth century with the development of the three synthetic indicators described above. Many students will be familiar with the use of phenolphthalein to identify blood—often shown on the various forensic chemistry TV dramas by dropping some solution on a cotton swab that has been used to pick up some of the sample in question. If the swab turns red we frequently hear "It's blood". The reality of using phenolphthalein in this way is more complicated. The test is presumptive for the presence of blood, but not conclusive. It is not an acid–base reaction but rather, in the presence of hydrogen peroxide, relies on hemoglobin to catalyze the oxidation of phenolphthalein. An interesting assignment for students in a high-school or non-majors course would be to have them explore the details of this Kastle–Meyers test to see just what is involved in the correct application of the test, and what factors complicate the process. For example, would tomato juice infused with asparagus juice give a positive Kastle–Meyers test? Historically phenolphthalein was used in a variety of laxatives. Recently that usage has been discontinued due to concern about the carcinogenic nature of the substance. A review of the history of the controversy surrounding the use of phenolphthalein in laxatives would make a good research paper at the high-school level. Lastly, students with some practice building structures and performing calculations might wish to explore the structures of two other forms of phenolphthalein—one found in very acidic solutions, having an orange color, and one found in very basic solutions that is colorless.

268

National Neighborhood Indicators Partnership  

NSDL National Science Digital Library

The National Neighborhood Indicators Partnership works "to build local capacity" through a range of activities, including the creation of apps, outreach projects, and much more. Visitors can look over the Partnershipâ??s Featured area to get a sense of its recent initiatives which include the creation of integrated data systems and neighborhood centers. The Activities area includes Issue Areas which feature publications and presentations on matters that include absenteeism, affordable housing, children, and community development. The Library includes online guides on local data sharing, a user conference directory, and short stories from partners on their own work. The site is rounded out by the Data & Tech section with summary information on the local neighborhood-level data held by numerous community partners throughout the United States.

269

Fatigue failure load indicator  

NASA Technical Reports Server (NTRS)

An indicator for recording the load at which a fatigue specimen breaks during the last cycle of a fatigue test is described. A load cell is attached to the specimen which is alternately subjected to tension and compression loads. The output of the load cell which is proportional to the load on the specimen is applied to the input of a peak detector. Each time the specimen is subjected to a compression load, means are provided for applying a positive voltage to the rest of the peak detector to reset it. During the last cycle of the tension load the peak detector measures the maximum load on the specimen. Means are provided for disconnecting the load cell from the peak detector when there is a failure in the specimen.

Imig, L. A.; Davis, W. T.; Davis, D. C. (inventors)

1979-01-01

270

Flammability Indices for Refrigerants  

NASA Astrophysics Data System (ADS)

This paper introduces a new index to classify flammable refrigerants. A question on flammability indices that ASHRAE employs arose from combustion test results of R152a and ammonia. Conventional methods of not only ASHRAE but also ISO and Japanese High-pressure gas safety law to classify the flammability of refrigerants are evaluated to show why these methods conflict with the test results. The key finding of this paper is that the ratio of stoichiometric concentration to LFL concentration (R factor) represents the test results most precisely. In addition, it has excellent correlation with other flammability parameters such as flame speed and pressure rise coefficient. Classification according to this index gives reasonable flammability order of substances including ammonia, R152a and carbon monoxide. Theoretical background why this index gives good correlation is also discussed as well as the insufficient part of this method.

Kataoka, Osami

271

Teaching Techniques  

E-print Network

the topic using other techniques. It is important that you know each member. Teaching Techniques Several teaching techniques are available: lecture, illus- trated talk, discussion, question and answer, demonstra- tion, work session or practical exercise... about the various shapes and distinguishing characteristics of insects, sketch them on a large sheet of paper or blackboard or show an actual specimen or picture. When the topic discussed is in the members? guide, you can have them follow along. 3...

Howard, Jeff W.

2005-05-10

272

Precipitation Indices Low Countries  

NASA Astrophysics Data System (ADS)

Since 1995, KNMI published a series of books(1), presenting an annual reconstruction of weather and climate in the Low Countries, covering the period AD 763-present, or roughly, the last millennium. The reconstructions are based on the interpretation of documentary sources predominantly and comparison with other proxies and instrumental observations. The series also comprises a number of classifications. Amongst them annual classifications for winter and summer temperature and for winter and summer dryness-wetness. The classification of temperature have been reworked into peer reviewed (2) series (AD 1000-present) of seasonal temperatures and temperature indices, the so called LCT (Low Countries Temperature) series, now incorporated in the Millennium databases. Recently we started a study to convert the dryness-wetness classifications into a series of precipitation; the so called LCP (Low Countries Precipitation) series. A brief outline is given here of the applied methodology and preliminary results. The WMO definition for meteorological drought has been followed being that a period is called wet respectively dry when the amount of precipitation is considerable more respectively less than usual (normal). To gain a more quantitative insight for four locations, geographically spread over the Low Countries area (De Bilt, Vlissingen, Maastricht and Uccle), we analysed the statistics of daily precipitation series, covering the period 1900-present. This brought us to the following definition, valid for the Low Countries: A period is considered as (very) dry respectively (very) wet if over a continuous period of at least 60 days (~two months) cq 90 days (~three months) on at least two out of the four locations 50% less resp. 50% more than the normal amount for the location (based on the 1961-1990 normal period) has been measured. This results into the following classification into five drought classes hat could be applied to non instrumental observations: Very wet period (+2): Wide scale river flooding, marshy acres and meadows.-Farmers cope with poor harvests of hay, grains, fruit etc. resulting in famines.-Late grape harvests, poor yield quantity and quality of wine. Wet period (+1): High water levels cq discharges of major rivers, tributaries and brooks, local river floodings, marshy acres and meadows in the low lying areas.-Wearisome and hampered agriculture. Normal (0) Dry period (-1): Low water levels cq discharges of major rivers, tributaries and brooks. Some brooks may dry up.-Summer half year: local short of yield of grass, hay and other forage.-Summer half year: moor-, peat- and forest fires. Very dry period (-2): Very low water levels cq discharges of major rivers and tributaries. Brooks and wells dry up. Serious shortage of drinking water; especially in summer.-Major agricultural damage, shortage of water, mortality stock of cattle. Shortage of grain. Flour can not be produced due to water mills running out of water, shortage of bread, bread riots, famines.-Large scale forest and peat areas, resulting in serious air pollution. Town fires. By verifying the historical evidence on these criterions, a series of 5 step indices ranging from very dry to very wet for summer and winter half year of the Low Countries was obtained. Subsequently these indices series were compared with the instrumentally observed seasonal precipitation sums for De Bilt (1735-2008), which is considered to be representative for the Central Netherlands. For winter (Oct-March) and summer half year (Apr.-Sept.) the accumulated precipitation amounts are calculated; these amounts are approximately normally distributed. Based on this distribution, the cumulative frequency distribution is calculated. By tabulating the number of summers in the pre-instrumental period 1201-1750 for each of the drought classes, a distribution is calculated which is then related to the modern accumulated precipitation distribution. Assuming that the accumulated precipitation amount has not been below (above) the mean precipitation minus (plus) three standard deviations for

van Engelen, A. F. V.; Ynsen, F.; Buisman, J.; van der Schrier, G.

2009-09-01

273

Percutaneous Nephrostomy: Technical Aspects and Indications  

PubMed Central

First described in 1955 by Goodwin et al as a minimally invasive treatment for urinary obstruction causing marked hydronephrosis, percutaneous nephrostomy (PCN) placement quickly found use in a wide variety of clinical indications in both dilated and nondilated systems. Although the advancement of modern endourological techniques has led to a decline in the indications for primary nephrostomy placement, PCNs still play an important role in the treatment of multiple urologic conditions. In this article, the indications, placement, and postprocedure management of percutaneous nephrostomy drainage are described. PMID:23204641

Dagli, Mandeep; Ramchandani, Parvati

2011-01-01

274

Formalising medical quality indicators to improve guidelines  

E-print Network

Formalising medical quality indicators to improve guidelines Marjolein van Gendt, Annette ten Teije,annette,rserban,frank.van.harmelen}@cs.vu.nl Abstract. Medical guidelines can significantly improve quality of med- ical care and reduce costs. But how formalisation as a technique for guideline quality improvement. Such formalisation points out anomalies

ten Teije, Annette

275

Formalising medical quality indicators to improve guidelines  

E-print Network

Formalising medical quality indicators to improve guidelines Marjolein van Gendt1 , Annette ten,annette,rserban,frank.van.harmelen}@cs.vu.nl Abstract. Medical guidelines can significantly improve quality of med- ical care and reduce costs. But how formalisation as a technique for guideline quality improvement. Such formalisation points out anomalies

van Harmelen, Frank

276

Oxygen Detection via Nanoscale Optical Indicators  

E-print Network

Oxygen Detection via Nanoscale Optical Indicators Ruby N. Ghosh Dept. of Physics Michigan State University East Lansing, MI, USA weekschr@msu.edu Abstract--Oxygen plays a ubiquitous role in terrestrial developed an optical technique for monitoring oxygen in both gas and liquid phases utilizing nanoscale metal

Ghosh, Ruby N.

277

A PRACTITIONERS IMPLEMENTATION OF INDICATOR KRIGING  

Microsoft Academic Search

Indicator Kriging (IK) was introduced by Journel in 1983, and since that time has grown to become one of the most widely-applied grade estimation techniques in the minerals industry. Its appeal lies in the fact that it makes no assumptions about the distribution underlying the sample data, and indeed that it can handle moderate mixing of diverse sample populations. However,

Ian Glacken; Paul Blackney

278

Endovascular extraction techniques  

PubMed Central

The use of lead extraction is expanding with the introduction of new endovascular extraction techniques. Indications for extraction of chronically implanted pacemaker leads have been classified as mandatory, necessary or discretionary, but their rationale is often based on clinical judgement without corresponding support from the literature. We reviewed the literature of pacemaker lead-related complications as a starting point for discussing the indications for lead extraction. ImagesFigure 1Figure 2Figure 3

Bracke, F.A.; Meijer, A.; van Gelder, B.

2001-01-01

279

Torsion--treatment indications.  

PubMed

Rotational problems, when outside the normal range, are referred to as torsional deformity. These deformities are relatively common in infancy and childhood, generally resolve spontaneously with growth, and rarely persist into adult life. There are few situations in which treatment is necessary. (1) Rigid metatarsus adductus that does not resolve during the first six months should be corrected by casting. The long leg cast is most effective, as it controls the rotation of the tibia. With the tibia stabilized, the foot can be laterally rotated and abducted, which usually allows correction using one or two casts. (2) Persistent, severe tibial medial or lateral torsion after the age of eight years may be corrected by a supramalleolar tibial rotational osteotomy. This is indicated for medial torsion beyond 15 degrees and for lateral torsion beyond 30 degrees. Fixation is provided by crossed, smooth pins and a long leg cast. Compartment syndromes and peroneal nerve injury are avoided by the distal correction. (3) Persistent, severe femoral antetorsion of more than 50 degrees after the age of eight years may justify correction. For operative correction, medial rotation should exceed 85 degrees and lateral rotation should be less than 10 degrees. The osteotomy for correction is fixed by threaded Steinmann pins cut off below the skin and supplemented with a spica cast. PMID:2676305

Staheli, L T

1989-10-01

280

[French Society of Anesthesia and Intensive Care. Arterial catheterization and invasive measurement of blood pressure in anesthesia and intensive care in adults].  

PubMed

A group of 13 experts appointed by the French Society of Anaesthesia and Intensive Care has produced the following guidelines for arterial catheterisation and invasive measurement of systemic arterial blood pressure in adults. Teflon or polyurethane catheters are recommended with a maximal size of 18 gauge for femoral and axillary arteries and 20 gauge for the others. For small arteries (radial and pedious arteries) a maximal length of 3-5 cm should be preferred. The benefit of heparin-coating is not documented. Incorporation of salts for radiopacity is useless and increases thrombogenicity. Use of a flush device with a constant flow of 2 mL.h-1 and a fast flush valve connected to normal saline under pressure is recommended. Manual intermittent flushing with a syringe is contra-indicated. Addition of heparin (2500 IU.500 mL-1 of flush solution) increases the duration of catheter patency and is recommended for catheterisations of more than 24 h duration. Ready for use devices are to be preferred. Distortion of pressure wave may be minimized by employing low volume, low compliance, low resistance devices. The number of connections should be as low as possible and all of Luer-lock type. The stopcocks should be clearly identified to minimize the risk of accidental intra-arterial injection. The device should be transparent for disclosure of bubbles, which lead to waveform distortion. For catheter placement the operator should follow the usual preparation as for any aseptic surgical procedure with cap, mask, gloves and sterile towel. The insertion site is prepped either with chlorhexidine or povidone-iodine. In the conscious patient, local anaesthesia by injection and/or topical application (EMLA) is recommended. Direct arterial puncture should be preferred rather than transfixion. Catheterisation of deep vessels is facilitated by Seldinger technique, which is recommended whatever the site of placement when long term monitoring and/or difficulties of insertion are foreseen. The radial artery is the site of choice for elective cases. The non-dominant hand should be preferred. Puncture must be preceded by assessment of adequacy of the collateral flow by the Alien test. The femoral artery is a valuable site for emergency situations. Before catheterisation, the artery should be auscultated for a murmur. Puncture of a vascular prosthesis is contra-indicated. The dressing should be changed every four days only. Sites of blood withdrawal should be manipulated with compresses soaked with chlorhexidine or povidone-iodine. The arterial catheter is only changed in case of evidence of local infection or ischaemia. The catheter removal should be considered as an aseptic surgical procedure. The catheter completeness has to be checked. A systematic culture of the catheter is not required. PMID:8572416

1995-01-01

281

Illustrating Chemiluminescence with Siloxene Indicator.  

ERIC Educational Resources Information Center

Discusses the nature of light-producing reactions and provides a procedure for demonstrating chemical luminescence using siloxene indicator. Indicates source of this chemical and safety precautions. (SK)

Hoff, Ray

1981-01-01

282

Should researchers use single indicators, best indicators, or multiple indicators in structural equation models?  

PubMed Central

Background Structural equation modeling developed as a statistical melding of path analysis and factor analysis that obscured a fundamental tension between a factor preference for multiple indicators and path modeling’s openness to fewer indicators. Discussion Multiple indicators hamper theory by unnecessarily restricting the number of modeled latents. Using the few best indicators – possibly even the single best indicator of each latent – encourages development of theoretically sophisticated models. Additional latent variables permit stronger statistical control of potential confounders, and encourage detailed investigation of mediating causal mechanisms. Summary We recommend the use of the few best indicators. One or two indicators are often sufficient, but three indicators may occasionally be helpful. More than three indicators are rarely warranted because additional redundant indicators provide less research benefit than single indicators of additional latent variables. Scales created from multiple indicators can introduce additional problems, and are prone to being less desirable than either single or multiple indicators. PMID:23088287

2012-01-01

283

Aseptic Technique  

NSDL National Science Digital Library

The North Carolina Community College System BioNetwork's interactive eLearning tools (IETs) are reusable chunks of training that can be deployed in a variety of courses or training programs. IETs are designed to enhance, not replace hands-on training. Learners are able to enter a hands-on lab experience better prepared and more confident. This particular IET delves into aseptic technique and how to work under a laminar airflow hood. Using animations, quizzes, games, and a final evaluation, this interactive lesson will help students understand the lab and important techniques for biology technicians.

284

Miscellaneous Techniques  

NASA Astrophysics Data System (ADS)

Nondestructive way of determining the food quality is the need of the hour. Till now major methods such as colour measurements and their modeling; machine vision systems; X-ray, CT and MRI; NIR spectroscopy; electronic nose and tongue; and ultrasonic technology have been discussed in detail. These techniques, in general, are considered to be sophisticated and costly, and therefore probably are not being adopted as fast as it should be. I am however of the reverse opinion. While going through these techniques, it has been seen that majority of quality parameters have been measured and correlated with the signals obtained using different equipment.

Jha, Shyam N.

285

Hacking Techniques  

Microsoft Academic Search

With tales of hacked networks and websites being reported by the media daily, people assume that hacking must be easy. But, in truth, the tools and techniques employed by hackers are extremely complex, utilizing a broad range of technologies. The number of mechanisms for breaking into systems, whatever the objective, is on the increase with new tools emerging continuously. This

Richard Barber

2001-01-01

286

Relationship of echocardiographic indices to pulmonary capillary wedge pressures in healthy volunteers  

NASA Technical Reports Server (NTRS)

OBJECTIVES: We sought to determine the relationship between different echocardiographic indices and pulmonary capillary wedge pressures (PCWP) in normal volunteers. BACKGROUND: Indices based on tissue Doppler (TDE) and color M-mode (CMM) echocardiography have been proposed to reflect left (LV) ventricular filling pressures. These include the ratio of early diastolic transmitral velocity (E) to early myocardial velocity measured by TDE (E') and the ratio of E to the wave propagation velocity (Vp) measured from CMM images. These indices, however, have not been validated in normal individuals. METHODS: We studied seven volunteers during two phases of preload altering maneuvers, baseline, with two stages of lower body negative pressure, and repeat baseline with two stages of volume loading. The PCWP obtained from right heart catheterization was compared with diastolic indices using pulsed Doppler, TDE and CMM echocardiography. RESULTS: The PCWP ranged from 2.2 to 23.5 mm Hg. During preload alterations, significant changes in E and septal E' (both p < 0.05) but not lateral E' or Vp were observed. Furthermore, E, septal E' and E/Vp correlated with PCWP (all r > 0.80) but not combined E and TDE indices (both r < 0.15). Within individuals, a similar linear relationship was observed among E/Vp, E and septal E' (average r > 0.80). CONCLUSIONS: In subjects without heart disease, E, septal E' and E/Vp correlate with PCWP. Because the influence of ventricular relaxation is minimized, the ratio E/Vp may be the best overall index of LV filling pressures.

Firstenberg, M. S.; Levine, B. D.; Garcia, M. J.; Greenberg, N. L.; Cardon, L.; Morehead, A. J.; Zuckerman, J.; Thomas, J. D.

2000-01-01

287

STEM Learning Quality Indicator Map  

E-print Network

STEM Learning Quality Indicator Map Quality Indicator Initiation Involvement Implementation Innovation Student Engagement STEM learning experiences are engaging and inspire creativity and imagination STEM learning experience is activity driven with specific step by step directions STEM learning

US Army Corps of Engineers

288

LEGAL, EDUCATIONAL, and INSTITUTIONAL INDICATORS  

E-print Network

-Related Indicators Continuing Education, Technical Assistance Protection of Special Values InstitutionsLEGAL, EDUCATIONAL, and INSTITUTIONAL INDICATORS John E. Mitchell and Stanley F. Hamilton #12;SRR Policies and Practices Public Information and Participation Professional Education/Technical Assistance

Wyoming, University of

289

Physiologic and Clinical Principles behind Noninvasive Resuscitation Techniques and Cardiac Output Monitoring  

PubMed Central

Clinical assessment and vital signs are poor predictors of the overall hemodynamic state. Optimal measurement of the response to fluid resuscitation and hemodynamics has previously required invasive measurement with radial and pulmonary artery catheterization. Newer noninvasive resuscitation technology offers the hope of more accurately and safely monitoring a broader range of critically ill patients while using fewer resources. Fluid responsiveness, the cardiac response to volume loading, represents a dynamic method of improving upon the assessment of preload when compared to static measures like central venous pressure. Multiple new hemodynamic monitors now exist that can noninvasively report cardiac output and oxygen delivery in a continuous manner. Proper assessment of the potential future role of these techniques in resuscitation requires understanding the underlying physiologic and clinical principles, reviewing the most recent literature examining their clinical validity, and evaluating their respective advantages and limitations. PMID:21860802

Napoli, Anthony M.

2012-01-01

290

Educational Indicators and Enlightened Policy  

Microsoft Academic Search

This article examines how educational indicators have been and may be used to serve educational policy ends, what the potential benefits and dangers are of various uses, and how guidelines for appropriate relationships between indicators and policy might be forged. The article draws particular attention to recent debates and difficulties in fashioning a constructive role for educational indicators—a role that

Linda Darling-Hammond

1992-01-01

291

Nanofabrication Techniques  

NSDL National Science Digital Library

This page from Foothill-De Anza Community College describes a course on nanoscience for those who need an introduction to the subject. This course is the fifth in a five course series that leads to a certificate in nanoscience, nanotechnology, and nanomaterials engineering. Students will obtain a survey of fabrication techniques as well as "hands-on experience creating thin film materials, and quality control 'shadowing' in a clean energy technology fabrication facility." The projects required by the class are also described.

2012-11-08

292

Online Handwriting Recognition for Indic Scripts  

NASA Astrophysics Data System (ADS)

Online handwriting recognition refers to the problem of machine recognition of handwriting captured in the form of pen trajectories. The recognition technology holds significant promise for Indic scripts, given that the Indic languages are used by a sixth of the world’s population, and the greater ease of use of handwriting-based text input for these scripts compared to keyboard-based methods. Even though the recognition of handwritten Devanagari, Bangla, and Tamil has received significant attention in recent times, one may say that research efforts directed at Indic script recognition in general are in their early stages. The structure of the scripts and the variety of shapes and writing styles pose challenges that are different from other scripts and hence require customized techniques for feature representation and recognition. In this chapter, we describe the challenges in recognizing online handwriting in Indic scripts and provide an overview of the state of the art for isolated character and word recognition. We then present in brief some of the promising applications, starting with handwriting-based text input systems (IMEs) that have been built for entering Indic scripts. In the last section, we provide a few pointers to resources such as tools and data sets that are currently available for online Indic script recognition research. endabstract

Bharath, A.; Madhvanath, Sriganesh

293

Non-invasive evaluation of hemodynamics in pulmonary hypertension by a Septal angle measured by computed tomography pulmonary angiography: Comparison with right-heart catheterization and association with N-terminal pro-B-type natriuretic peptide  

PubMed Central

The septal angle, an angle between the interventricular septum and the line connecting the sternum midpoint and thoracic vertebral spinous process, as measured by computed tomographic pulmonary angiography (CTPA), has been observed to be increased in patients with pulmonary hypertension (PH), but its meaning remains unclear. The aim of this study was to investigate the potential role of the septal angle in evaluating hemodynamics and its association with N-terminal pro-B-type natriuretic peptide (NT-proBNP) in patients with PH. Patients with PH (n=106), including 76 with chronic thromboembolic pulmonary hypertension (CTEPH) and 30 with pulmonary artery hypertension (PAH), were retrospectively reviewed. The patients underwent CTPA prior to right-heart catheterization. The septal angle was measured on transversal CTPA images. Hemodynamic parameters were evaluated by right-heart catheterization. The level of plasma NT-proBNP was measured by enzyme-linked sandwich immunoassay. The septal angle had a moderate correlation with cardiac output (CO; r=?0.535, P=0.000) and a high correlation with pulmonary vascular resistance (PVR; r=0.642, P=0.000). The mean level of NT-proBNP in PH was 1,716.09±1,498.30 pg/ml, which correlated with the septal angle (r=0.693, P=0.000). In a stepwise forward regression analysis, the Septal angle was entered into the final equation for predicting PVR, leading to the following equation: PVR = 28.256 × Septal angle - 728.72. In CTEPH, the Septal angle strongly correlated with NT-proBNP (r=0.668, P=0.000) and PVR (r=0.676, P=0.000). In PAH, the Septal angle strongly correlated with NT-proBNP (r=0.616, P=0.003) and PVR (r=0.623, P=0.000). The CTPA-derived Septal angle is a superior predictor for evaluating and monitoring the level of NT-proBNP and PVR in patients with PH. PMID:24255661

TANG, QIANG; LIU, MIN; MA, ZHANHONG; GUO, XIAOJUAN; KUANG, TUGUANG; YANG, YUANHUA

2013-01-01

294

The attribute measurement technique  

SciTech Connect

Any verification measurement performed on potentially classified nuclear material must satisfy two seemingly contradictory constraints. First and foremost, no classified information can be released. At the same time, the monitoring party must have confidence in the veracity of the measurement. An information barrier (IB) is included in the measurement system to protect the potentially classified information while allowing sufficient information transfer to occur for the monitoring party to gain confidence that the material being measured is consistent with the host's declarations, concerning that material. The attribute measurement technique incorporates an IB and addresses both concerns by measuring several attributes of the nuclear material and displaying unclassified results through green (indicating that the material does possess the specified attribute) and red (indicating that the material does not possess the specified attribute) lights. The attribute measurement technique has been implemented in the AVNG, an attribute measuring system described in other presentations at this conference. In this presentation, we will discuss four techniques used in the AVNG: (1) the 1B, (2) the attribute measurement technique, (3) the use of open and secure modes to increase confidence in the displayed results, and (4) the joint design as a method for addressing both host and monitor needs.

Macarthur, Duncan W [Los Alamos National Laboratory; Langner, Diana [Los Alamos National Laboratory; Smith, Morag [Los Alamos National Laboratory; Thron, Jonathan [Los Alamos National Laboratory; Razinkov, Sergey [RFNC-VNIIEF; Livke, Alexander [RFNC-VNIIEF

2010-01-01

295

Fecal Indicator Bacteria and Environmental Observations: Validation of Virtual Beach  

EPA Science Inventory

Contamination of recreational waters by fecal material is often assessed using indicator bacteria such as enterococci. Enumeration based on culturing methods can take up to 48 hours to complete, limiting the accuracy of water quality evaluations. Molecular microbial techniques em...

296

Portable circuit-interruption indicator  

NASA Technical Reports Server (NTRS)

Device locates transient power interruptions occurring in electrical equipment. Indicator operates on principle that circuit in normal use retains residual current in the line prior to an interruption.

Bezant, K. R.

1971-01-01

297

Nondestructive indices of trace element exposure in squamate reptiles  

E-print Network

Nondestructive indices of trace element exposure in squamate reptiles W.A. Hopkins a,b, *, J.H. Roe'': Nondestructive sampling techniques, such as blood samples and tail clips, can be used to evaluate as development of nondestructive sampling techniques useful for assessing and monitoring contaminant exposure

Hopkins, William A.

298

Management Technique  

NASA Technical Reports Server (NTRS)

Ball Aerospace Systems Division developed a highly efficient management method known as the "total integrated systems approach" a technique developed of necessity for managing extremely complex aerospace programs involving integration of a great many individual systems. These systems, developed at different times by many different companies, must not only work perfectly when separately tested, they must also perform compatibly when integrated into the complete prime system. Systems approach is essentially a carefully considered, painstakingly executed master plan for coordinated design, development and assembly of the multitude of elements that constitute the end product. Intent is to eliminate problems that may occur when specific parts of total functioning system fail to come together to provide the requisite performance of the prime system.

1980-01-01

299

Science Indicators and Science Priorities.  

ERIC Educational Resources Information Center

Discusses science/society interface and difficulties involved in developing realistic science indicators. Topics include: intrinsic vs. extrinsic indicators; four problems society faces as a result of technological activities (toxic chemicals, radioactive wastes, auto safety, cancer); research and development (R&D) priorities; international…

Brooks, Harvey

1982-01-01

300

CRITICAL EVALUATION OF ECOLOGICAL INDICATORS  

EPA Science Inventory

EPA's Office of Research and Development (ORD) has prepared fifteen technical guidelines to evaluate the suitability of an ecological indicator in a monitoring program. The guidelines were fashioned to provide a consistent framework for indicator review and to provide guidance fo...

301

Quality Indicators for Learning Analytics  

ERIC Educational Resources Information Center

This article proposes a framework of quality indicators for learning analytics that aims to standardise the evaluation of learning analytics tools and to provide a mean to capture evidence for the impact of learning analytics on educational practices in a standardised manner. The criteria of the framework and its quality indicators are based on…

Scheffel, Maren; Drachsler, Hendrik; Stoyanov, Slavi; Specht, Marcus

2014-01-01

302

Sustainability Indicators: A Scientific Assessment  

Technology Transfer Automated Retrieval System (TEKTRAN)

The book entitled "Sustainability Indicators: A Scientific Assessment," which was a product of a multi-location research effort and workshoip held in Prague Czech Republic, is reviewed for readers of the Journal of Enviromental Quality (JEQ). The overview and chapters on biodiversity indicators and ...

303

Pressure Switch Is a Low Cost Battery Indicator  

NASA Technical Reports Server (NTRS)

Conventional pressure switch, fabricated by printed-circuit manufacturing techniques, can indicate when charge on battery departs from preset level. Membrane on switch is exposed to internal pressure of battery, which varies according to stored charge. When pressure varies from preset level, switch can turn on a light-emitting diode or similar indicator to warn user that battery is low.

Abita, J. L.

1982-01-01

304

Identifying Quality Indicators of SAE and FFA: A Delphi Approach  

ERIC Educational Resources Information Center

The purpose of this study was to determine quality indicators for SAE and FFA according to 36 experts across the United States. This is a part of a larger study looking at all components of the traditional three-circle model. The study utilized the Delphi technique to garner expert opinion about quality indicators in Agricultural Education. For…

Jenkins, Charles Cordell, III; Kitchel, Tracy

2009-01-01

305

Indicating the Attitudes of High School Students to Environment  

ERIC Educational Resources Information Center

Within this work in which it has been aimed to indicate the attitudes of High School Students to environment, indication of the attitudes of high school students in Nigde has been regarded as the problem matter. This analysis has the qualification of survey model and techniques of questionnaire and observation have been used. The investigation has…

Ozkan, Recep

2013-01-01

306

The role of the ECG in diagnosis, risk estimation, and catheterization laboratory activation in patients with acute coronary syndromes: a consensus document.  

PubMed

The electrocardiogram (ECG) is the most widely used imaging tool helping in diagnosis and initial management of patients presenting with symptoms compatible with acute coronary syndrome. Acute ischemia affects the configuration of the QRS complexes, the ST segments and the T waves. The ECG should be read along with the clinical assessment of the patient. ST segment elevation (and ST depression in leads V1 -V3 ) in patients with active symptoms usually indicates acute occlusion of an epicardial artery with ongoing transmural ischemia. These patients should be triaged for emergent reperfusion therapy per current guidelines. However, many patients have ST segment elevation secondary to nonischemic causes. ST depression in leads other than V1 -V3 usually are indicative of subendocardial ischemia secondary to subocclusion of the epicardial artery, distal embolization to small arteries or spasm supply/demand mismatch. ST depression may also be secondary to nonischemic etiologies, such as left ventricular hypertrophy, cardiomyopathies, etc. Knowing the clinical scenario, comparison to previous ECG and subsequent ECGs (in cases that there are changes in the quality or severity of symptoms) may add in the diagnosis and interpretation in difficult cases. This review addresses the different ECG patterns, typically seen in patients with active symptoms, after resolution of symptoms and the significance of such changes when seen in asymptomatic patients. PMID:25262661

Birnbaum, Yochai; Nikus, Kjell; Kligfield, Paul; Fiol, Miguel; Barrabés, Jose Antonio; Sionis, Alessandro; Pahlm, Olle; Niebla, J Garcia; de Luna, Antonio Bayès

2014-09-01

307

[Current status and indications for contrast echocardiography].  

PubMed

Due to newly developed techniques contrast echocardiography (CE) is less often applied today. As to reevaluate the usefulness and the indications for CE 7823 consecutive echocardiographic studies were analysed. In 638 (8%) of these studies CE was used. 379 patients showed signs of right ventricular overload, 58 due to a left-to-right shunt. Pressure overload due to pulmonary hypertension was found in 321 cases. CE enhanced doppler flow signals in tricuspid regurgitation and facilitated quantification of right heart dimensions. 259 patients were screened for patent foramen ovale (PFO), 94 after embolic events, and 165 because neurosurgical intervention in a sitting position was planned. So CE proved to be still indicated in the era of color flow doppler, especially for the detection of PFO. PMID:7701922

Weihs, W; Anelli-Monti, B; Picha, R; Schuchlenz, H; Harb, S; Harnoncourt, K

1994-01-01

308

Passive Tamper Indicating Enclosures Incorporating Embedded Optical Fibre  

SciTech Connect

AWE and PNNL are engaged in a technical collaboration investigating techniques to enhance continuity of knowledge over Accountable Items within a verified nuclear weapons dismantlement process. Tamper Indicating Enclosures (TIE) will likely be deployed as part of a chain of custody regime to indicate an unauthorised attempt to access an Accountable Item. This paper looks at the use of passive TIEs incorporating embedded optical fibre; concepts relating to deployment, tamper indication and unique identification will be discussed.

Wynn, Paul; White, Helen; Allen, Keir; Simmons, Kevin L.; Sliva, Paul; Benz, Jacob M.; Tanner, Jennifer E.

2011-08-14

309

Investigation of Some Metallochromic Indicators.  

ERIC Educational Resources Information Center

Presents some introductory experiments involving the reaction between EDTA and several metal ions using metallochromic indicators. The experiments represent familiar reactions and are followed by suggestions for extension into areas of discovery work by students. (Author/SA)

Jones, A. V.; Nelson, M.

1979-01-01

310

COLIPHAGES AS INDICATORS OF ENTEROVIRUSES  

EPA Science Inventory

Coliphages were monitored in conjunction with indicator bacteria and enteric viruses in a drinking water plant modified to reduce trihalomethane (THM) production. Coliphages could be detected in the source water by direct innoculation and sufficient coliphages were detected in en...

311

Global Climate Change Key Indicators  

NSDL National Science Digital Library

This website charts measurement of key indicators of global climate change. Simple explanations and "What Does This Mean?" sections accompany each area of sea level, carbon dioxide concentration, global surface temperature, Arctic sea ice and land ice.

312

Weld width indicates weld strength  

NASA Technical Reports Server (NTRS)

Width of butt weld in 2219-T87 aluminum has been found to be more reliable indicator of weld strength than more traditional parameters of power input and cooling rate. Yield stress and ultimate tensile strength tend to decrease with weld size. This conclusion supports view of many professional welders who give priority to weld geometry over welding energy or cooling rate as indicator of weld quality.

Nunes, A. C. J.; Novak, H. L.; Mcllwain, M. C.

1982-01-01

313

Bulk lifetime indicates surface contamination  

NASA Technical Reports Server (NTRS)

Indirect measurement of wafer surface impurities has sensitivity of 300 monolayers. Photoconductivity-decay apparatus determines bulk recombination lifetime in semiconductor materials. Bulk impurity levels before and after annealing relate to level of surface contamination. Method evaluates wafer cleaning techniques, qualifying purity of chemical and deionized water used, or monitors production process.

Blais, P. D.

1981-01-01

314

Behavioral indicators of pilot workload  

NASA Technical Reports Server (NTRS)

Using a technique that requires a subject to consult an imagined or remembered spatial array while performing a visual task, a reliable reduction in the number of directed eye movements that are available for the acquisition of visual information is shown.

Galanter, E.; Hochberg, J.

1983-01-01

315

Council High LevelCouncil High Level IndicatorsIndicators  

E-print Network

INDICATORS,, ContinuedContinued LifeLife--cycle mortalitycycle mortality ·· Life stage survival estimates AbundanceTotal Abundance ·· Total adult salmon and steelhead returnsTotal adult salmon and steelhead returns for representativeLife stage survival estimates for representative populations of Chinook and steelhead

316

DRAFT: Biological and Implementation Indicators (June 10, 2008) Indicator Description  

E-print Network

. Based on NOAA definitions Life-cycle mortality Life stage survival estimates for representative INDICATORS Total Abundance Total adult salmon and steelhead returns to the Columbia. Number passing Bonneville Dam (1938- present) Abundance of adult fish in the Council's program. Number of salmon, steelhead

317

Radiomorphometric Indices of the Mandible – An Indicator of Osteoporosis  

PubMed Central

Introduction: Osteoporosis is a regressive change which occurs in the bone and it is seldom diagnosed before the occurrence of fractures. Hence, determination of mandibular bone density is of paramount importance for the detection of this silent disease. Aims and Objectives: The purpose of this study was to evaluate the influences of gender and age on the radiomorphometric indices and to assess the differences in the various indices, if any, between digital and analog radiographs. Materials and Methods: Two hundred and fifty six panoramic radiographs (128 digital and 128 analog) were obtained and they were grouped into 8 age groups which were between 21 to 60 years with 5 year intervals between them, with equal sex distributions. The mandibular cortical index (MCI), mental index (MI) and panoramic mandibular index (PMI) were analyzed. Results: C2 and C3 categories of MCI increased as age advanced in females. MI showed a significant difference in genders and MI Values decreased from younger to older females. PMI (p<0.05) was significant for both the genders. Conclusion: This study showed that MCI, MI and PMI indices were useful for identifying patients with low skeletal bone mineral densities (BMD) or osteoporosis and that digital panoramic radiographs were better than analog radiographs for measuring the indices. PMID:24783135

Govindraju, Poornima; Chandra, Poornima

2014-01-01

318

Validation of the use of photogrammetry to register pre-procedure MR images to intra-procedure patient position for image-guided cardiac catheterization procedures  

NASA Astrophysics Data System (ADS)

A hybrid X-ray and magnetic resonance imaging system (XMR) has been proposed as an interventional guidance for cardiovascular catheterisation procedure. However, very few hospitals can benefit from the XMR system because of its limited availability. In this paper we describe a new guidance strategy for cardiovascular catheterisation procedure. In our technique, intra-operative patient position is estimated by using a chest surface reconstructed from a photogrammetry system. The chest surface is then registered with the same surface derived from pre-procedure magnetic resonance (MR) images. The catheterisation procedure can therefore be guided by a roadmap derived from the MR images. Patients were required to hold the breath at end expiration during MRI acquisition. The surface matching accuracy is improved by using a robust trimmed iterative closest point (ICP) matching algorithm, which is especially designed for incomplete surface matching. Compared to the XMR system, the proposed guidance strategy is low cost and easy to set up. Experimental data were acquired from 6 volunteers and 1 patient. The patient data were collected during an electrophysiology procedure. In 6 out of 7 subjects, the experimental results show our method is accurate in term of reciprocal residual error (range from 1.66m to 3.75mm) and constant (closed-loop TREs range from 1.49mm to 3.55mm). For one subject, trimmed ICP failed to find the optimal transform matrix (residual = 4.89, TRE = 9.32) due to the poor quality of the photogrammetry-reconstructed surface. More studies are being carried on in clinical trials.

Gao, Gang; Tarte, Segolene; King, Andy; Ma, Yingliang; Chinchapatnam, Phani; Schaeffter, Tobias; Razavi, Reza; Hawkes, Dave; Hill, Derek; Rhode, Kawal

2008-03-01

319

Indo-China Monsoon Indices  

PubMed Central

Myanmar and Thailand often experience severe droughts and floods that cause irreparable damage to the socio-economy condition of both countries. In this study, the Southeastern Asian Summer Monsoon variation is found to be the main element of interannual precipitation variation of the region, more than the El Niño/Southern Oscillation (ENSO). The ENSO influence is evident only during the boreal spring season. Although the monsoon is the major factor, the existing Indian Monsoon Index (IMI) and Western North Pacific Monsoon Index (WNPMI) do not correlate well with the precipitation variation in the study regions of Southern Myanmar and Thailand. Therefore, a new set of indices is developed based on the regional monsoon variations and presented here for the first time. Precipitation variations in Southern Myanmar and Thailand differ as well as the elements affecting the precipitation variations in different seasons. So, separate indices are proposed for each season for Southern Myanmar and Thailand. Four new monsoon indices based on wind anomalies are formulated and are named as the Indochina Monsoon Indices. These new indices correlate better with the precipitation variations of the study region as compared to the existing IMI and WNPMI. PMID:25630503

Tsai, ChinLeong; Behera, Swadhin K.; Waseda, Takuji

2015-01-01

320

Indo-china monsoon indices.  

PubMed

Myanmar and Thailand often experience severe droughts and floods that cause irreparable damage to the socio-economy condition of both countries. In this study, the Southeastern Asian Summer Monsoon variation is found to be the main element of interannual precipitation variation of the region, more than the El Niño/Southern Oscillation (ENSO). The ENSO influence is evident only during the boreal spring season. Although the monsoon is the major factor, the existing Indian Monsoon Index (IMI) and Western North Pacific Monsoon Index (WNPMI) do not correlate well with the precipitation variation in the study regions of Southern Myanmar and Thailand. Therefore, a new set of indices is developed based on the regional monsoon variations and presented here for the first time. Precipitation variations in Southern Myanmar and Thailand differ as well as the elements affecting the precipitation variations in different seasons. So, separate indices are proposed for each season for Southern Myanmar and Thailand. Four new monsoon indices based on wind anomalies are formulated and are named as the Indochina Monsoon Indices. These new indices correlate better with the precipitation variations of the study region as compared to the existing IMI and WNPMI. PMID:25630503

Tsai, ChinLeong; Behera, Swadhin K; Waseda, Takuji

2015-01-01

321

Transurethral plasmakinetic resection of the prostate is a reliable minimal invasive technique for benign prostate hyperplasia: a meta-analysis of randomized controlled trials.  

PubMed

To evaluate the efficacy and safety of plasmakinetic resection of the prostate (PKRP) versus transurethral resection of the prostate (TURP) for the treatment of patients with benign prostate hyperplasia (BPH), a meta-analysis of randomized controlled trials was carried out. We searched PubMed, Embase, Web of Science and the Cochrane Library. The pooled estimates of maximum flow rate, International Prostate Symptom Score, operation time, catheterization time, irrigated volume, hospital stay, transurethral resection syndrome, transfusion, clot retention, urinary retention and urinary stricture were assessed. There was no notable difference in International Prostate Symptom Score between TURP and PKRP groups during the 1-month, 3 months, 6 months and 12 months follow-up period, while the pooled Q max at 1-month favored PKRP group. PKRP group was related to a lower risk rate of transurethral resection syndrome, transfusion and clot retention, and the catheterization time and operation time were also shorter than that of TURP. The irrigated volume, length of hospital stay, urinary retention and urinary stricture rate were similar between groups. In conclusion, our study suggests that the PKRP is a reliable minimal invasive technique and may anticipatorily prove to be an alternative electrosurgical procedure for the treatment of BPH. PMID:25337839

Wang, Kai; Li, Yao; Teng, Jing-Fei; Zhou, Hai-Yong; Xu, Dan-Feng; Fan, Yi

2015-01-01

322

Transurethral plasmakinetic resection of the prostate is a reliable minimal invasive technique for benign prostate hyperplasia: a meta-analysis of randomized controlled trials  

PubMed Central

To evaluate the efficacy and safety of plasmakinetic resection of the prostate (PKRP) versus transurethral resection of the prostate (TURP) for the treatment of patients with benign prostate hyperplasia (BPH), a meta-analysis of randomized controlled trials was carried out. We searched PubMed, Embase, Web of Science and the Cochrane Library. The pooled estimates of maximum flow rate, International Prostate Symptom Score, operation time, catheterization time, irrigated volume, hospital stay, transurethral resection syndrome, transfusion, clot retention, urinary retention and urinary stricture were assessed. There was no notable difference in International Prostate Symptom Score between TURP and PKRP groups during the 1-month, 3 months, 6 months and 12 months follow-up period, while the pooled Qmax at 1-month favored PKRP group. PKRP group was related to a lower risk rate of transurethral resection syndrome, transfusion and clot retention, and the catheterization time and operation time were also shorter than that of TURP. The irrigated volume, length of hospital stay, urinary retention and urinary stricture rate were similar between groups. In conclusion, our study suggests that the PKRP is a reliable minimal invasive technique and may anticipatorily prove to be an alternative electrosurgical procedure for the treatment of BPH. PMID:25337839

Wang, Kai; Li, Yao; Teng, Jing-Fei; Zhou, Hai-Yong; Xu, Dan-Feng; Fan, Yi

2015-01-01

323

Breastfeeding indicators in Dakahlia governorate.  

PubMed

This study was carried out in Dakahlia Governorate to assess current breastfeeding practices using the standardized breastfeeding indicators developed by the World Health Organization and to highlight the impact of some socioeconomic and maternal factors on these indicators. An interview was carried out with mothers of 1200 infants and children < 24 months during a poliomyelitis immunization campaign in urban and rural areas. The findings indicate that 84.6% of infants aged 0-4 months are fully breastfed, with 42.5% and 42.1% of them exclusively and predominantly breastfed respectively. Rural infants are more likely to be exclusively breastfed, to continue breastfeeding for 1 year and to initiate breastfeeding early. Non-working mothers are more likely to breastfeed exclusively and more likely to continue breastfeeding for 1 year. PMID:16450526

El-Gilany, A H

2003-01-01

324

Exclusive breastfeeding: measurement and indicators  

PubMed Central

Background Accurate measurement of the duration of exclusive breastfeeding is complicated by factors related to definitions, timing, duration of recall, methods of analysis, and sample biases. Clearly prospective methods are likely to be more accurate but are too expensive to use in most large-scale surveys. Internationally, most surveys use a point-in-time or current status measurement (usually 24-hour recall) and report their findings using an indicator established by the World Health Organisation (WHO) in 1991 that involves combining all babies less than six months old in order to obtain a large enough sample size to result in stable proportions that can be compared over time. However, this indicator is complex to understand and explain and is widely misunderstood, even within the breastfeeding community. It is commonly cited in ways that greatly exaggerate how common exclusive breastfeeding actually is. Discussion A life-long or since birth indicator, introduced in 2000, counts infants as no longer exclusively breastfed as soon as anything else is fed to them. This is appropriate to do if for example data are being used to link infant feeding patterns with vertical transmission of HIV or later patterns of infant allergy. However, this indicator underestimates the total extent of exclusive breastfeeding, since some women interrupt but then resume it after a period of supplementation (which could for example only be a small amount of water given a single time). Summary Exactly which indicator is best to use depends on the purpose for which the data are being used. However, for surveys, the best approach, rarely used, would be to report indicators based on both point-in-time and life-long data. PMID:25349624

2014-01-01

325

Seismic hydrocarbon indicators lower risks  

Microsoft Academic Search

Recent advances in seismic hydrocarbon indicator (HCl) technology have been responsible for lowering exploration risk and opening new trends and stratigraphic plays in mature areas. The use of new HCl technology has led to a wildcat success rate greater than 50% in some trends. For example, since 1987 over 300 bcf of gas has been discovered in stratigraphic traps in

O. Welper; J. L. Allen; G. Fiongos

1991-01-01

326

Myers-Briggs Type Indicator  

Microsoft Academic Search

This note describes the theory and interpretation of the Myers-Briggs Type Indicator, perhaps the most widely used assessment instrument today. The note is brief and appropriate for single, short sessions involving the Myers-Briggs. For more extended treatment, see the book entitled Please Understand Me by David Keirsey and Marilyn Bates (Del Mar, CA: Gnosology Books, 1984).

James Clawson

327

Scale-Independent Bibliometric Indicators  

ERIC Educational Resources Information Center

This article presents the author's critique of Anthony F. J. van Raan's article titled, "Measurement of Central Aspects of Scientific Research: Performance, Interdisciplinarity, Structure." van Raan makes an excellent case for using bibliometric data to measure some central aspects of scientific research and to construct indicators of groups:…

Katz, J. Sylvan

2005-01-01

328

America's Children: Key National Indicators  

E-print Network

http://www.ojp.usdoj.gov/nij Office of Juvenile Justice and Delinquency Prevention http and Family Statistics #12;#12;America's Children: Key National Indicators of Well-Being, 2013 Federal Interagency Forum on Child and Family Statistics #12;Federal Interagency Forum on Child and Family Statistics

Rau, Don C.

329

Developing Indicators of Student Coursework.  

ERIC Educational Resources Information Center

The School Reform Assessment (SRA) project began in 1987 with the objective of developing indicators of student coursework that reliably and validly measure this central feature of schooling, while remaining sensitive to major policy changes and the information needs of policymakers, and efficiently collecting and reporting data. This paper…

McDonnell, Lorraine M.; Ormseth, Tor

330

Lattice Planes and Miller Indices  

NSDL National Science Digital Library

This website will help students visualize and understand lattice planes and Miller indices. The site has a sequence of interactive visualizations and animations which allow students to view movies which show the orientation of planes within in a mineral lattice in a step-by-step sequence. The site includes an embedded glossary of terms and requires Macromedia Flash Player version 8 or later.

Metallurgy, Department O.; Cambridge, University O.

331

Social Indicators and Social Reporting  

ERIC Educational Resources Information Center

Describes the several research traditions which combine to form the social indicators movement. All the traditions share concern for measurement, analysis, and reporting of aspects of social conditions to a general audience. Journal available from: American Academy of Political and Social Science, 3937 Chestnut Street, Philadelphia, Pennsylvania…

Parke, Robert; Seidman, David

1978-01-01

332

Quality Indicators of Online Programs  

ERIC Educational Resources Information Center

The continued growth of online programs in higher education has resulted in concerns about how institutions monitor the quality of their online programs. These concerns indicate a need for a process by which online programs may be evaluated and compared. They provided the impetus for this study, the goals of which were to identify quality…

Hirner, Leo; Kochtanek, Thomas

2012-01-01

333

Geochemical indicators of intrinsic bioremediation  

Microsoft Academic Search

A detailed field investigation has been completed at a gasoline-contaminated aquifer near Rocky Point, NC, to examine possible indicators of intrinsic bioremediation and identify factors that may significantly influence the rae and extent of bioremediation. The dissolved plume of benzene, toluene, ethylbenzene, and xylene (BTEX) in ground water is naturally degrading. Toluene and o-xylene are most rapidly degraded followed by

Robert C. Borden; Carlos A. Gomez; Mark T. Becker

1995-01-01

334

Usage centric green performance indicators  

Microsoft Academic Search

Energy effciency of data centers is gaining importance as energy consumption and carbon footprint awareness are rising. Green Performance Indicators (GPIs) provide measurable means to assess the energy effciency of a resource or system. Most of the metrics commonly used today measure the energy effciency potential of a resource, system or application usage, rather than the energy effciency of the

Doron Chen; Ealan Henis; Ronen I. Kat; Dmitry Sotnikov; Cinzia Cappiello; Alexandre Mello Ferreira; Barbara Pernici; Monica Vitali; Tao Jiang; Jia Liu; Alexander Kipp

2011-01-01

335

MSPI False Indication Probability Simulations  

SciTech Connect

This paper examines false indication probabilities in the context of the Mitigating System Performance Index (MSPI), in order to investigate the pros and cons of different approaches to resolving two coupled issues: (1) sensitivity to the prior distribution used in calculating the Bayesian-corrected unreliability contribution to the MSPI, and (2) whether (in a particular plant configuration) to model the fuel oil transfer pump (FOTP) as a separate component, or integrally to its emergency diesel generator (EDG). False indication probabilities were calculated for the following situations: (1) all component reliability parameters at their baseline values, so that the true indication is green, meaning that an indication of white or above would be false positive; (2) one or more components degraded to the extent that the true indication would be (mid) white, and “false” would be green (negative) or yellow (negative) or red (negative). In key respects, this was the approach taken in NUREG-1753. The prior distributions examined were the constrained noninformative (CNI) prior used currently by the MSPI, a mixture of conjugate priors, the Jeffreys noninformative prior, a nonconjugate log(istic)-normal prior, and the minimally informative prior investigated in (Kelly et al., 2010). The mid-white performance state was set at ?CDF = ?10 ? 10-6/yr. For each simulated time history, a check is made of whether the calculated ?CDF is above or below 10-6/yr. If the parameters were at their baseline values, and ?CDF > 10-6/yr, this is counted as a false positive. Conversely, if one or all of the parameters are set to values corresponding to ?CDF > 10-6/yr but that time history’s ?CDF < 10-6/yr, this is counted as a false negative indication. The false indication (positive or negative) probability is then estimated as the number of false positive or negative counts divided by the number of time histories (100,000). Results are presented for a set of base case parameter values, and three sensitivity cases in which the number of FOTP demands was reduced, along with the Birnbaum importance of the FOTP.

Dana Kelly; Kurt Vedros; Robert Youngblood

2011-03-01

336

Image compression technique  

DOEpatents

An image is compressed by identifying edge pixels of the image; creating a filled edge array of pixels each of the pixels in the filled edge array which corresponds to an edge pixel having a value equal to the value of a pixel of the image array selected in response to the edge pixel, and each of the pixels in the filled edge array which does not correspond to an edge pixel having a value which is a weighted average of the values of surrounding pixels in the filled edge array which do correspond to edge pixels; and subtracting the filled edge array from the image array to create a difference array. The edge file and the difference array are then separately compressed and transmitted or stored. The original image is later reconstructed by creating a preliminary array in response to the received edge file, and adding the preliminary array to the received difference array. Filling is accomplished by solving Laplace's equation using a multi-grid technique. Contour and difference file coding techniques also are described. The techniques can be used in a method for processing a plurality of images by selecting a respective compression approach for each image, compressing each of the images according to the compression approach selected, and transmitting each of the images as compressed, in correspondence with an indication of the approach selected for the image.

Fu, Chi-Yung (San Francisco, CA); Petrich, Loren I. (Livermore, CA)

1997-01-01

337

Image compression technique  

DOEpatents

An image is compressed by identifying edge pixels of the image; creating a filled edge array of pixels each of the pixels in the filled edge array which corresponds to an edge pixel having a value equal to the value of a pixel of the image array selected in response to the edge pixel, and each of the pixels in the filled edge array which does not correspond to an edge pixel having a value which is a weighted average of the values of surrounding pixels in the filled edge array which do correspond to edge pixels; and subtracting the filled edge array from the image array to create a difference array. The edge file and the difference array are then separately compressed and transmitted or stored. The original image is later reconstructed by creating a preliminary array in response to the received edge file, and adding the preliminary array to the received difference array. Filling is accomplished by solving Laplace`s equation using a multi-grid technique. Contour and difference file coding techniques also are described. The techniques can be used in a method for processing a plurality of images by selecting a respective compression approach for each image, compressing each of the images according to the compression approach selected, and transmitting each of the images as compressed, in correspondence with an indication of the approach selected for the image. 16 figs.

Fu, C.Y.; Petrich, L.I.

1997-03-25

338

Combining Multiple Indicators to Determine Conservation Status  

E-print Network

Combining Multiple Indicators to Determine Conservation Status Based on Expert Preferences of Resource Management (Planning) Title of Project: Combining multiple indicators to determine conservation on using multiple indicators, and most methods for combining indicators either assume that all indicators

339

Microbial indicators of soil quality  

SciTech Connect

Soil quality is an elusive term; however, the quality of a soil can greatly impact land use, sustainability, and productivity. Soil microbial processes are an integral part of soil quality and a better understanding of these processes and microbial community structure is needed. Microbial biomass, respiration, and labile nutrient pool size have generally been used as intrinsic parameters of a soil's microbial status. These analyses may not fully identify inherent differences in soil quality, especially if environmental conditions or manmade pertubations alter microbial community structure. Assessment of microbial community structure is necessary to determine the long-term effects of stress on soil quality. Measurement of microbial diversity should include nucleic acid and fatty acid phospholipid profiles as well as substrate utilization patterns. Microbial indicators will allow us to characterize the ecological status of the soil microbial community. For soil quality indicators to be successful, integration with other soil parameters is essential.

Turco, R.F.; Kennedy, A.C.; Jawson, M.

1992-01-01

340

Using and Testing Drought Indicators  

Microsoft Academic Search

Several drought indices have been applied to different hydrological time series relevant to droughts in the Community of Madrid\\u000a and its water supply system, managed by public company Canal de Isabel II (CYII). Results have been studied in order to establish\\u000a how much useful information can be drawn from them with emphasis in its diagnosis ability and anticipation capacity.\\u000a \\u000a The

Luis García Amor; Alejandro Carrasco; Juan Carlos Ibáñez

341

Science and Engineering Indicators: 1996  

NSF Publications Database

This report is available in hypertext and Portable Document Format (.pdf). See Help for more information about viewing publications in different formats. U.S. Science and Engineering in a Changing World To accompany Science and Engineering Indicators- 1996, The National Science Board offers this brief assessment ofkey policy issues facing the Nation as it seeks to sustain U.S. leadership in science and engineering.

342

Science and Engineering Indicators--1996  

NSF Publications Database

This report is available in hypertext and Portable Document Format (.pdf). See Help for more information about viewing publications in different formats. U.S. Science and Engineering in a Changing World To accompany Science and Engineering Indicators- 1996, The National Science Board offers this brief assessment ofkey policy issues facing the Nation as it seeks to sustain U.S. leadership in science and engineering.

343

Riverine Plants as Biological Indicators  

Microsoft Academic Search

\\u000a Plants are widely recorded as indicators of the condition of rivers, particularly the trophic state; however the scientific\\u000a basis for this use is weak and conflicting. A feature of published information on the influence of pollutants on the distribution\\u000a of river plants is that for most “conclusive” demonstrations of a trend, there is an equally conclusive demonstration of the\\u000a opposite.

Richard Lansdown; Sam Bosanquet

344

The Emperor's New Security Indicators  

Microsoft Academic Search

We evaluate Website authentication measures that are designed to protect users from man-in-the-middle, 'phishing', and other site forgery attacks. We asked 67 bank customers to conduct common online banking tasks. Each time they logged in, we presented increasingly alarming clues that their connection was insecure. First, we removed HTTPS indicators. Next, we removed the participant's site-authentication image--the customer-selected image that

Stuart E. Schechter; Rachna Dhamija; Andy Ozment; Ian Fischer

2007-01-01

345

DOE performance indicators guidance document  

SciTech Connect

SEN-29-91 directed that a Department-wide uniform process for trending and analysis of operational data be established for DOE facilities. This Performance Indicator (PI) Program establishes a uniform system for trending and analyzing operational data providing an important tool to help assess and support progress in improving performance and strengthening both DOE and contractor line management control of operations. DOE, similar to the commercial nuclear industry, considers that facilities with good performance, as measured by an overall set of performance indicators, are well-managed facilities. The Performance Indicator Program established by SEN-29-91 is but one of several initiatives undertaken by DOE to instill a new DOE and DOE contractor line management culture committed to achieving a rising standard of acceptable performance. Line management trending and analysis of data depicting the performance of their facilities is an essential element in creating this culture of ``continuous improvement,`` where performance gains achieved are maintained and early identification of deteriorating environmental, safety, and health conditions is accomplished.

Not Available

1992-12-01

346

Analytical techniques: A compilation  

NASA Technical Reports Server (NTRS)

A compilation, containing articles on a number of analytical techniques for quality control engineers and laboratory workers, is presented. Data cover techniques for testing electronic, mechanical, and optical systems, nondestructive testing techniques, and gas analysis techniques.

1975-01-01

347

Developing classification indices for Chinese pulse diagnosis  

E-print Network

Aim: To develop classification criteria for Chinese pulse diagnosis and to objectify the ancient diagnostic technique. Methods: Chinese pulse curves are treated as wave signals. Multidimensional variable analysis is performed to provide the best curve fit between the recorded Chinese pulse waveforms and the collective Gamma density functions. Results: Chinese pulses can be recognized quantitatively by the newly-developed four classification indices, that is, the wave length, the relative phase difference, the rate parameter, and the peak ratio. The new quantitative classification not only reduces the dependency of pulse diagnosis on Chinese physician's experience, but also is able to interpret pathological wrist-pulse waveforms more precisely. Conclusions: Traditionally, Chinese physicians use fingertips to feel the wrist-pulses of patients in order to determine their health conditions. The qualitative theory of the Chinese pulse diagnosis is based on the experience of Chinese physicians for thousands of year...

Shu, Jian-Jun

2014-01-01

348

Construction and demolition waste indicators.  

PubMed

The construction industry is one of the biggest and most active sectors of the European Union (EU), consuming more raw materials and energy than any other economic activity. Furthermore, construction waste is the commonest waste produced in the EU. Current EU legislation sets out to implement construction and demolition waste (CDW) prevention and recycling measures. However it lacks tools to accelerate the development of a sector as bound by tradition as the building industry. The main objective of the present study was to determine indicators to estimate the amount of CDW generated on site both globally and by waste stream. CDW generation was estimated for six specific sectors: new residential construction, new non-residential construction, residential demolition, non-residential demolition, residential refurbishment, and non-residential refurbishment. The data needed to develop the indicators was collected through an exhaustive survey of previous international studies. The indicators determined suggest that the average composition of waste generated on site is mostly concrete and ceramic materials. Specifically for new residential and new non-residential construction the production of concrete waste in buildings with a reinforced concrete structure lies between 17.8 and 32.9 kg m(-2) and between 18.3 and 40.1 kg m(-2), respectively. For the residential and non-residential demolition sectors the production of this waste stream in buildings with a reinforced concrete structure varies from 492 to 840 kg m(-2) and from 401 to 768 kg/m(-2), respectively. For the residential and non-residential refurbishment sectors the production of concrete waste in buildings lies between 18.9 and 45.9 kg/m(-2) and between 18.9 and 191.2 kg/m(-2), respectively. PMID:23315370

Mália, Miguel; de Brito, Jorge; Pinheiro, Manuel Duarte; Bravo, Miguel

2013-03-01

349

Space Weathering: An Ultraviolet Indicator  

NASA Technical Reports Server (NTRS)

We present evidence suggesting that the spectral slope of airless bodies in the UV-visible wavelength range can be used as an indicator of exposure to space weathering. While space weathering generally produces a reddening of spectra in the visible-NIR spectral regions, it tends to result in a bluing of the UV-visible portion of the spectrum, and may in some cases produce a spectral reversal. The bluing effect may be detectable with smaller amounts of weathering than are necessary to detect the longer-wavelength weathering effects.

Hendrix, A. R.; Vilas, F.

2004-01-01

350

Space Weathering: An Ultraviolet Indicator  

NASA Technical Reports Server (NTRS)

We present evidence suggesting that the spectral slope of airless bodies in the UV-visible wavelength range can be used as an indicator of exposure to space weathering. While space weathering generally produces a reddening of spectra in the visible-NIR spectral regions, it tends to result in a bluing of the UV-visible portion of the spectrum, and may in some cases produce a spectral reversal. The bluing effect may be detectable with smaller amounts of weathering than are necessary to detect the longer-wavelength weathering effects.

Hendrix, A. R.; Vilas, F.

2003-01-01

351

Low latency counter event indication  

DOEpatents

A hybrid counter array device for counting events with interrupt indication includes a first counter portion comprising N counter devices, each for counting signals representing event occurrences and providing a first count value representing lower order bits. An overflow bit device associated with each respective counter device is additionally set in response to an overflow condition. The hybrid counter array includes a second counter portion comprising a memory array device having N addressable memory locations in correspondence with the N counter devices, each addressable memory location for storing a second count value representing higher order bits. An operatively coupled control device monitors each associated overflow bit device and initiates incrementing a second count value stored at a corresponding memory location in response to a respective overflow bit being set. The incremented second count value is compared to an interrupt threshold value stored in a threshold register, and, when the second counter value is equal to the interrupt threshold value, a corresponding "interrupt arm" bit is set to enable a fast interrupt indication. On a subsequent roll-over of the lower bits of that counter, the interrupt will be fired.

Gara, Alan G. (Mount Kisco, NY); Salapura, Valentina (Chappaqua, NY)

2010-08-24

352

Low latency counter event indication  

DOEpatents

A hybrid counter array device for counting events with interrupt indication includes a first counter portion comprising N counter devices, each for counting signals representing event occurrences and providing a first count value representing lower order bits. An overflow bit device associated with each respective counter device is additionally set in response to an overflow condition. The hybrid counter array includes a second counter portion comprising a memory array device having N addressable memory locations in correspondence with the N counter devices, each addressable memory location for storing a second count value representing higher order bits. An operatively coupled control device monitors each associated overflow bit device and initiates incrementing a second count value stored at a corresponding memory location in response to a respective overflow bit being set. The incremented second count value is compared to an interrupt threshold value stored in a threshold register, and, when the second counter value is equal to the interrupt threshold value, a corresponding "interrupt arm" bit is set to enable a fast interrupt indication. On a subsequent roll-over of the lower bits of that counter, the interrupt will be fired.

Gara, Alan G. (Mount Kisco, NY); Salapura, Valentina (Chappaqua, NY)

2008-09-16

353

Nursing attire: indicators of professionalism?  

PubMed

The purpose of this qualitative research was to explore the effect that current nursing attire has on the image of the nursing profession. A number of nurses and a nonnurse were interviewed to determine how attire affected their perception of today's nurses. The two research questions were as follows: (1) is the changing dress of nurses projecting a negative image to the public? and (2) What components of a nurse's apparel indicate professionalism? Content analysis was performed on transcriptions from the tape-recorded responses of a purposeful sample of health care workers: 12 registered nurses, 1 bachelor of nursing student, and 1 layperson. The responses for the first research question were not directly addressed by the participants. However, one overall theme emerged, which was labeled "I can't tell you what it is, but I know it when I see it." The main theme that emerged for the second research question was labeled "total package," with role identification and competency being related themes. As a result of this research, nursing administrators and other health care professionals could gain an understanding of the importance of nursing attire as an indicator of nursing professionalism. Future research needs to examine the same research questions with health care consumers in a variety of acute and community-based health care settings. PMID:10377629

Lehna, C; Pfoutz, S; Peterson, T G; Degner, K; Grubaugh, K; Lorenz, L; Mastropietro, S; Rogers, L S; Schoettle, B; Seck, L L

1999-01-01

354

Y sign: clinical indicator to stop trenching and start cracking.  

PubMed

Phacoemulsification is challenging in soft cataracts due to the difficulty in cracking the nucleus by a divide-and-conquer technique or by chopping. We describe another technique, the Y sign for trenching endpoint: a clinical sign that indicates the surgeon should stop trenching and start cracking during classical divide-and-conquer nucleofractis emulsification using proximal downslope trenching. This technique exploits the morphological structure of the lens to precisely gauge the depth of the trench at which the surgeon can split even a soft nucleus into small wedges without instrument cheese-wiring and thus perform safer phacoemulsification while reducing the risk for posterior capsule rupture. PMID:23522581

Kurian, Mathew; Das, Sudeep; Umarani, B; Nagappa, Somshekar; Shetty, Rohit; Shetty, Bhujang K

2013-04-01

355

Generalized indices for = 1 theories in four-dimensions  

NASA Astrophysics Data System (ADS)

We use localization techniques to calculate the Euclidean partition functions for = 1 theories on four-dimensional manifolds M of the form S 1 × M 3, where M 3 is a circle bundle over a Riemann surface. These are generalizations of the = 1 indices in four-dimensions including the lens space index. We show that these generalized indices are holomorphic functions of the complex structure moduli on M. We exhibit the deformation by background flat connection.

Nishioka, Tatsuma; Yaakov, Itamar

2014-12-01

356

Optical indices of lithiated electrochromic oxides  

SciTech Connect

Optical indices have been determined for thin films of several electrochromic oxide materials. One of the most important materials in electrochromic devices, WO{sub 3}, was thoroughly characterized for a range of electrochromic states by sequential injection of Li ions. Another promising material, Li{sub 0.5}Ni{sub 0.5}O, was also studied in detail. Less detailed results are presented for three other common lithium-intercalating electrochromic electrode materials: V{sub 2}O{sub 5}, LiCoO{sub 2}, and CeO{sub 2}-TiO{sub 2}. The films were grown by sputtering, pulsed laser deposition (PLD) and sol-gel techniques. Measurements were made using a combination of variable-angle spectroscopy ellipsometry and spectroradiometry. The optical constants were then extracted using physical and spectral models appropriate to each material. Optical indices of the underlying transparent conductors, determined in separate studies, were fixed in the models of this work. The optical models frequently agree well with independent physical measurements of film structure, particularly surface roughness by atomic force microscopy. Inhomogeneity due to surface roughness, gradient composition, and phase separation are common in both the transparent conductors and electrochromics, resulting sometimes in particularly complex models for these materials. Complete sets of data are presented over the entire solar spectrum for a range of colored states. This data is suitable for prediction of additional optical properties such as oblique transmittance and design of complete electrochromic devices.

Rubin, M.; Rottkay, K. von; Wen, S.J.; Ozer, N.; Slack, J.

1996-09-01

357

Internet Economy Indicators: January 2001 Internet Economy Indicators  

NSDL National Science Digital Library

Internet Economy Indicators published in January the third of its biannual reports on the state of the Internet economy (for information on the June 2000 report, see the September 7, 2000 Scout Report for Business & Economics). The latest report finds that "the addition of 612,375 jobs in the Internet Economy in the first six months of 2000 was nearly as much as all of 1999 (when 650,000 jobs were added)." These data apparently belie more dire recent predictions concerning the state of the Internet economy. The report offers data and analysis of employment, revenues, types of jobs, comparison of Internet employment growth to the rest of the economy, comparison of Internet employment growth to revenue growth, and more. Funded by Cisco systems, the report was conducted by the University of Texas. Questions about the influence of corporate sponsors aside, the information here serves as a counterbalance to concerns about dot.com crashes (the report points out that dot.coms make up less than ten percent of the Internet's economy). The full report is offered in .pdf format with an executive summary, key findings, an overview, and selected data also posted on-site in HTML. The site also features an extensive report entitled Dot Coms and Productivity in the Internet Economy as well as an archive of previous biannual reports.

2001-01-01

358

'Blueberry' Layers Indicate Watery Origins  

NASA Technical Reports Server (NTRS)

This microscopic image, taken at the outcrop region dubbed 'El Capitan' near the Mars Exploration Rover Opportunity's landing site, reveals millimeter-scale (.04 inch-scale) layers in the lower portion. This same layering is hinted at by the fine notches that run horizontally across the sphere-like grain or 'blueberry' in the center left. The thin layers do not appear to deform around the blueberry, indicating that these geologic features are concretions and not impact spherules or ejected volcanic material called lapilli. Concretions are balls of minerals that form in pre-existing wet sediments. This image was taken by the rover's microscopic imager on the 29th martian day, or sol, of its mission. The observed area is about 3 centimeters (1.2 inches) across.

2004-01-01

359

Triboluminescent tamper-indicating device  

DOEpatents

A tamper-indicating device is described. The device has a transparent or translucent cylindrical body that includes triboluminescent material, and an outer opaque layer that prevents ambient light from entering. A chamber in the body holds an undeveloped piece of photographic film bearing an image. The device is assembled from two body members. One of the body members includes a recess for storing film and an optical assembly that can be adjusted to prevent light from passing through the assembly and exposing the film. To use the device with a hasp, the body members are positioned on opposite sides of a hasp, inserted through the hasp, and attached. The optical assembly is then manipulated to allow any light generated from the triboluminescent materials during a tampering activity that damages the device to reach the film and destroy the image on the film.

Johnston, Roger G. (Los Alamos, NM); Garcia, Anthony R. E. (Espanola, NM)

2002-01-01

360

Invasive procedures with questionable indications  

PubMed Central

Insufficient coordination of medical research and partial isolation from the international scientific community can result in application of invasive methods without sufficient indications. Here is presented an overview of renal and pancreatic biopsy studies performed in the course of the operations of pancreatic blood shunting into the systemic blood flow in type 1 diabetic patients. Furthermore a surgical procedure of lung denervation as a treatment method of asthma as well as the use of bronchoscopy for research in asthmatics are discussed here. Today, the upturn in Russian economy enables acquisition of modern equipment; and medical research is on the increase. Under these circumstances, the purpose of this letter was to remind that, performing surgical or other invasive procedures, the risk-to-benefit ratio should be kept as low as possible. PMID:25568799

Jargin, Sergei V.

2014-01-01

361

[Ketamine: psychiatric indications and misuses].  

PubMed

Ketamine or -ketamine hydrochloride- is used as an anesthesic and a painkiller. It may also, in some indications, be prescribed in psychiatry and addictology. A literature review was conducted from 2003 to 2013, in PubMed, Google Scholar, Embase, and Psyclnfo, using the following key words (alone or combined): "ketamine", "abuse", "addiction", "dependence" and "misuse". Various studies have shown the benefit of kétamine in some psychiatric conditions such as major depressive episodes and electroconvulsive therapy. Others have demonstrated beneficial effects in alcohol or opiate abstinence maintenance. Ketamine seems to be a promising molecule in psychiatry and in the treatment of addictions, despite the absence of marketing approval for those specific uses. Being a strong psycho-stimulant, ketamine can be the source of abuse and dependence with somatic, psychiatric and cognitive complications. PMID:25158385

Delimbeuf, N; Petit, A; Karila, L; Lejoyeux, M

2014-01-01

362

Stability Indicators in Network Reconstruction  

PubMed Central

The number of available algorithms to infer a biological network from a dataset of high-throughput measurements is overwhelming and keeps growing. However, evaluating their performance is unfeasible unless a ‘gold standard’ is available to measure how close the reconstructed network is to the ground truth. One measure of this is the stability of these predictions to data resampling approaches. We introduce NetSI, a family of Network Stability Indicators, to assess quantitatively the stability of a reconstructed network in terms of inference variability due to data subsampling. In order to evaluate network stability, the main NetSI methods use a global/local network metric in combination with a resampling (bootstrap or cross-validation) procedure. In addition, we provide two normalized variability scores over data resampling to measure edge weight stability and node degree stability, and then introduce a stability ranking for edges and nodes. A complete implementation of the NetSI indicators, including the Hamming-Ipsen-Mikhailov (HIM) network distance adopted in this paper is available with the R package nettools. We demonstrate the use of the NetSI family by measuring network stability on four datasets against alternative network reconstruction methods. First, the effect of sample size on stability of inferred networks is studied in a gold standard framework on yeast-like data from the Gene Net Weaver simulator. We also consider the impact of varying modularity on a set of structurally different networks (50 nodes, from 2 to 10 modules), and then of complex feature covariance structure, showing the different behaviours of standard reconstruction methods based on Pearson correlation, Maximum Information Coefficient (MIC) and False Discovery Rate (FDR) strategy. Finally, we demonstrate a strong combined effect of different reconstruction methods and phenotype subgroups on a hepatocellular carcinoma miRNA microarray dataset (240 subjects), and we validate the analysis on a second dataset (166 subjects) with good reproducibility. PMID:24587057

Riccadonna, Samantha; Jurman, Giuseppe; Furlanello, Cesare

2014-01-01

363

Cardiac catheterization laboratory management: the fundamentals.  

PubMed

Increasingly, imaging administrators are gaining oversight for the cardiac cath lab as part of imaging services. Significant daily challenges include physician and staff demands, as well as patients who in many cases require higher acuity care. Along with strategic program driven responsibilities, the management role is complex. Critical elements that are the major impacts on cath lab management, as well as the overall success of a cardiac and vascular program, include program quality, patient safety, operational efficiency including inventory management, and customer service. It is critically important to have a well-qualified cath lab manager who acts as a leader by example, a mentor and motivator of the team, and an expert in the organization's processes and procedures. Such qualities will result in a streamlined cath lab with outstanding results. PMID:22720540

Newell, Amy

2012-01-01

364

3D dynamic roadmapping for abdominal catheterizations.  

PubMed

Despite rapid advances in interventional imaging, the navigation of a guide wire through abdominal vasculature remains, not only for novice radiologists, a difficult task. Since this navigation is mostly based on 2D fluoroscopic image sequences from one view, the process is slowed down significantly due to missing depth information and patient motion. We propose a novel approach for 3D dynamic roadmapping in deformable regions by predicting the location of the guide wire tip in a 3D vessel model from the tip's 2D location, respiratory motion analysis, and view geometry. In a first step, the method compensates for the apparent respiratory motion in 2D space before backprojecting the 2D guide wire tip into three dimensional space, using a given projection matrix. To countervail the error connected to the projection parameters and the motion compensation, as well as the ambiguity caused by vessel deformation, we establish a statistical framework, which computes a reliable estimate of the guide wire tip location within the 3D vessel model. With this 2D-to-3D transfer, the navigation can be performed from arbitrary viewing angles, disconnected from the static perspective view of the fluoroscopic sequence. Tests on a realistic breathing phantom and on synthetic data with a known ground truth clearly reveal the superiority of our approach compared to naive methods for 3D roadmapping. The concepts and information presented in this paper are based on research and are not commercially available. PMID:18982662

Bender, Frederik; Groher, Martin; Khamene, Ali; Wein, Wolfgang; Heibel, Tim Hauke; Navab, Nassir

2008-01-01

365

Prophylactic ureteral catheterization in colon surgery  

Microsoft Academic Search

PURPOSE: The preoperative placement of prophylactic ureteral catheters in operations of the distal colon is both commonplace and controversial. We assessed the frequency, safety, and effectiveness of their use over a five and one-half-year period in a teaching hospital. METHODS: The charts of 561 consecutive patients who underwent sigmoid or rectosigmoid colectomy from 1986 to 1991 were analyzed for age,

William N. Bothwell; Richard J. Bleicher; Thomas L. Dent

1994-01-01

366

Pathogenesis of infections related to intravascular catheterization.  

PubMed Central

Over the past few decades, there have been major technological improvements in the manufacture of intravenous solutions and the manufacture and design of catheter materials. However, the risk of infection in patients receiving infusion therapy remains substantial, in part because of host factors (for example, increased use of immunosuppressive therapy, more aggressive surgery and life support, and improved survival at the extremes of life) and in part because of the availability of catheters that can be left in place for very long periods. Microbial components of normal skin flora, particularly coagulase-negative staphylococci, have emerged as the predominant pathogens in catheter-associated infections. Therefore, efforts to prevent skin microorganisms from entering the catheter wound (such as tunnelling of catheters and use of catheter cuffs and local antimicrobial agents) are logical and relatively effective. The specific properties of microorganisms that transform normally harmless commensals such as coagulase-negative staphylococci into formidable pathogens in the presence of a plastic foreign body are being explored. For example, Staphylococcus epidermidis elaborates a polysaccharide adhesin that also functions as a capsule and is a target for opsonic killing. However, the interactions between microorganism and catheter that lead to adherence, persistence, infection, and dissemination appear to be multifactorial. Images PMID:8472248

Goldmann, D A; Pier, G B

1993-01-01

367

Utility of Precipitation Indices as Indicators of Drought in Nevada  

NASA Astrophysics Data System (ADS)

Throughout Nevada snow-dominated watersheds prevail and are critical for water supply for both human and natural environmental demands. Therefore, understanding characteristics of water shortages, such as length and severity, is extremely important to both scientists and the general public. This study examines the effectiveness of two precipitation indices, the standardized precipitation index (SPI) and the standardized precipitation evapotranspiration index (SPEI), to identify drought periods and consider the role of evapotranspiration processes in drought conditions. Whereas the SPI reflects solely precipitation deficit or surplus, the SPEI takes into account the effects of both precipitation and temperature. Several weather stations throughout Nevada and eastern California have been selected for this study. They were utilized to compute SPI and SPEI over their entire period of record. The potential evapotranspiration (PET) component of the SPEI was calulated using two different methods, Thorthwaite and Penman-Monteith. This was done to determine the sensitiviy of the SPEI to simple PET calculations with limited variables (Thornthwaite) versus complex PET calculations (Penman-Monteith). Preliminary results suggest that overall the SPEI is an improvement from the SPI in identifying severe and extended hydrologic drought periods, but results varied from station to station. SPI does not always account for droughts in which above normal temperatures play a significant role. To assess future changes in drought length and severity, we used bias-corrected and statistically downscaled GCM projections of monthly temperature and precipitation as input into the SPI and SPEI calculations. Initial results reveal that the role of increasing temperature in the SPEI calcualtion suggests more frequent and longer duration droughts in the future when compared to SPI projections.

McEvoy, D.; Edwards, L. M.; Huntington, J. L.

2011-12-01

368

Efficacy of Intra-Arterial Infusion Chemotherapy for Head and Neck Cancers Using Coaxial Catheter Technique: Initial Experience  

SciTech Connect

The aim of this study was to evaluate the efficacy of intra-arterial infusion chemotherapy for head and neck cancers using a coaxial catheter technique: the superficial temporal artery (STA)-coaxial catheter method. Thirty-one patients (21 males and 10 females; 37-83 years of age) with squamous cell carcinoma of the head and neck (maxilla, 2; epipharynx, 4; mesopharynx, 8; oral floor, 4; tongue, 10; lower gingiva, 1; buccal mucosa, 2) were treated by intra-arterial infusion chemotherapy. Four patients were excluded from the tumor-response evaluation because of a previous operation or impossibility of treatment due to catheter trouble. Forty-eight sessions of catheterization were performed. A guiding catheter was inserted into the STA and a microcatheter was advanced into the tumor-feeding artery via the guiding catheter under angiographic guidance. When the location of the tumor or its feeding artery was uncertain on angiography, computed tomographic angiography was performed. The anticancer agent carboplatin (CBDCA) was continuously injected for 24 h through the microcatheter from a portable infusion pump attached to the patient's waist. The total administration dose was 300-1300 mg per body. External radiotherapy was administered during intra-arterial chemotherapy at a total dose of 21-70.5 Gy.The initial response was complete response in 15 patients, partial response in 7 patients, and no change in 5 patients; the overall response rate was 81.5% (22/27). Complication-related catheter maintenance was observed in 15 of 48 sessions of catheterization. Injury and dislocation of the microcatheter occurred 10 times in 7 patients. Catheter infection was observed three times in each of two patients, and catheter occlusion and vasculitis occurred in two patients. Intra-arterial infusion chemotherapy via the STA-coaxial catheter method could have potential as a favorable treatment for head and neck tumors.

Tsurumaru, Daisuke, E-mail: tsuru-d@radiol.med.kyushu-u.ac.jp; Kuroiwa, Toshiro; Yabuuchi, Hidetake; Hirata, Hideki [National Kyushu Cancer Center, Department of Radiology (Japan); Higaki, Yuichiro; Tomita, Kichinobu [National Kyushu Cancer Center, Department of Head and Neck Surgery (Japan)

2007-04-15

369

Construct Validity of the Myers-Briggs Type Indicator  

Microsoft Academic Search

The Myers-Briggs Type Indicator (MBTI) is widely recognized as an important measure of normal or non-pathological variations in personality. However, the construct validity of the measure has not been clearly established using factor analytic techniques. The present study investigated the structure and item performance of the instrument using data from 359 college students. Factor analysis was applied to the 95

Bruce Thompson; Gloria M. Borrello

1986-01-01

370

The accuracy of real estate indices: Repeat sale estimators  

Microsoft Academic Search

Simulation techniques allow us to examine the behavior and accuracy of several repeat sales regression estimators used to construct real estate return indices. We show that the generalized least squares (GLS) method is the maximum likelihood estimator, and we show how estimation accuracy can be significantly improved through a Baysian approach. In addition, we introduce a biased estimation procedure based

William Nelson Goetzmann

1992-01-01

371

Research Performance Evaluation: Some Critical Thoughts on Standard Bibliometric Indicators  

ERIC Educational Resources Information Center

The bibliometric methodology is an established technique for research evaluation as it offers an objective determination and comparison of research performance. This paper aims to critically assess some standard bibliometric indicators commonly used (based on publication and citation counts) to evaluate academic units, and examine whether there…

Anninos, Loukas N.

2014-01-01

372

PARTICLE ASSOCIATION EFFECTS ON MICROBIAL INDICATOR CONCENTRATIONS FOR CSO DISINFECTION  

EPA Science Inventory

The effect of blending on indicator microorganism concentrations in combined sewer overflow (CSO) was investigated due to concerns that standard techniques fail to measure particle-associated organisms found in sewage. It was shown that blending CSO samples diluted in a mixture ...

373

Indicated Prevention of Problem Gambling Among College Students  

Microsoft Academic Search

This research provides a brief qualitative description of the development of an indicated prevention intervention for college student gamblers. The proposed intervention integrates alcohol prevention strategies with elements of gambling treatment. The intervention combines cognitive-behavioral skills-training and motivational interviewing and includes personalized normative feedback, cognitive correction, discussion of gambling consequences, and relapse prevention techniques. Examples detailing all phases of the

Ruby Y. Takushi; Clayton Neighbors; Mary E. Larimer; Ty W. Lostutter; Jessica M. Cronce; G. Alan Marlatt

2004-01-01

374

Optically broadcasting wind direction indicator  

NASA Technical Reports Server (NTRS)

An optically broadcasting wind direction indicator generates flashes of light which are separated by a time interval that is directly proportional to the angle of the wind direction relative to a fixed direction, such as north. An angle/voltage transducer generates a voltage that is proportional to the wind direction relative to the fixed direction, and this voltage is employed by timing circuitry or a microprocessor that generates pulses for actuating a light source trigger circuit first at the start of the time interval, and then at the end of the time interval. To aid an observer in distinguishing between the beginning and end of the interval, two stop flashes can be provided in quick succession. The time scale is preferably chosen so that each second of the time interval corresponds to 30 deg of direction relative to north. In this manner, an observer can easily correlate the measured time interval to the wind direction by visualizing the numbers on a conventional clock face, each of which correspond to one second of time and 30 deg of angle.

Zysko, Jan A. (inventor)

1994-01-01

375

A sensitivity analysis of nine diversity and seven similarity indices  

USGS Publications Warehouse

Indices summarizing community structure are used to evaluate fundamental community ecology, species interaction, biogeographical factors, and environmental stress. Some of these indices are insensitive to gross community changes induced by contaminants of pollution. Sixteen indices commonly used to assess the status of aquatic communities in water quality studies were evaluated using computer simulation techniques to determine specific index responses. Three communities of different initial structure (19 species, 38 species, and 83 species) were generated using the lognormal equation. Each community was then perturbed in three ways: common species disproportionally reduced, all species proportionally reduced, and rare species disproportionally reduced. The behavior of the indices was analyzed graphically and differential response due to initial community structure and type of community change was documented. Some recommendations of potential sources of error using community levels indices were developed.

Boyle, Terrence P.; Smillie, Gary M.; Anderson, Jana C.; Beeson, David R.

1990-01-01

376

September 2006 FORENSIC TECHNIQUES  

E-print Network

September 2006 FORENSIC TECHNIQUES: HELPING ORGANIZATIONS IMPROVE THEIR RESPONSES TO INFORMATION SECURITY INCIDENTS FORENSIC TECHNIQUES: HELPING ORGANIZATIONS IMPROVE THEIR RESPONSES TO INFORMATION and Technology National Institute of Standards and Technology Digital forensic techniques involve the application

377

Endothelial keratoplasty technique for aniridic aphakic eyes.  

PubMed

We describe special techniques to visualize the donor tissue in Descemet's stripping endothelial keratoplasty and to prevent the tissue or stripped recipient Descemet's membrane from dropping onto the retina. The techniques were used successfully to treat corneal decompensation in 3 consecutive cases with no iris or lens present. The results indicate that with careful planning and a good technique, aniridic aphakic patients can benefit from the rapid corneal rehabilitation provided by endothelial keratoplasty. PMID:17321384

Price, Marianne O; Price, Francis W; Trespalacios, Rafael

2007-03-01

378

Evaluation of European diatom trophic indices  

Microsoft Academic Search

Freshwater diatoms are considered to be reliable indicators of the trophic status of rivers and lakes. In the past 30 years, a number of indicator indices have been developed and used for the assessment of trophic conditions all over Europe. It is however still not clear whether the ecologic signature of diatoms differs between these indicator indices. The present study

Anna Besse-Lototskaya; Piet F. M. Verdonschot; Michel Coste; Bart Van de Vijver

2011-01-01

379

PROGRAMME GROUP RESEARCH UPDATE: Biodiversity indicators &  

E-print Network

1 PROGRAMME GROUP RESEARCH UPDATE: Biodiversity indicators & knowledge management programme group Introduction Duncan Ray The programme group Biodiversity Indicators and Knowledge Management (BIKM) was established by the merger of the Biodiversity Indicators & Evaluation Programme and the Decision Support

380

Enhanced Archaerhodopsin Fluorescent Protein Voltage Indicators  

PubMed Central

A longstanding goal in neuroscience has been to develop techniques for imaging the voltage dynamics of genetically defined subsets of neurons. Optical sensors of transmembrane voltage would enhance studies of neural activity in contexts ranging from individual neurons cultured in vitro to neuronal populations in awake-behaving animals. Recent progress has identified Archaerhodopsin (Arch) based sensors as a promising, genetically encoded class of fluorescent voltage indicators that can report single action potentials. Wild-type Arch exhibits sub-millisecond fluorescence responses to trans-membrane voltage, but its light-activated proton pump also responds to the imaging illumination. An Arch mutant (Arch-D95N) exhibits no photocurrent, but has a slower, ~40 ms response to voltage transients. Here we present Arch-derived voltage sensors with trafficking signals that enhance their localization to the neural membrane. We also describe Arch mutant sensors (Arch-EEN and -EEQ) that exhibit faster kinetics and greater fluorescence dynamic range than Arch-D95N, and no photocurrent at the illumination intensities normally used for imaging. We benchmarked these voltage sensors regarding their spike detection fidelity by using a signal detection theoretic framework that takes into account the experimentally measured photon shot noise and optical waveforms for single action potentials. This analysis revealed that by combining the sequence mutations and enhanced trafficking sequences, the new sensors improved the fidelity of spike detection by nearly three-fold in comparison to Arch-D95N. PMID:23840563

Gong, Yiyang; Li, Jin Zhong; Schnitzer, Mark J.

2013-01-01

381

Advanced Fibre Bragg Grating and Microfibre Bragg Grating Fabrication Techniques  

NASA Astrophysics Data System (ADS)

Fibre Bragg gratings (FBGs) have become a very important technology for communication systems and fibre optic sensing. Typically, FBGs are less than 10-mm long and are fabricated using fused silica uniform phase masks which become more expensive for longer length or non-uniform pitch. Generally, interference UV laser beams are employed to make long or complex FBGs, and this technique introduces critical precision and control issues. In this work, we demonstrate an advanced FBG fabrication system that enables the writing of long and complex gratings in optical fibres with virtually any apodisation profile, local phase and Bragg wavelength using a novel optical design in which the incident angles of two UV beams onto an optical fibre can be adjusted simultaneously by moving just one optical component, instead of two optics employed in earlier configurations, to vary the grating pitch. The key advantage of the grating fabrication system is that complex gratings can be fabricated by controlling the linear movements of two translation stages. In addition to the study of advanced grating fabrication technique, we also focus on the inscription of FBGs written in optical fibres with a cladding diameter of several ten's of microns. Fabrication of microfibres was investigated using a sophisticated tapering method. We also proposed a simple but practical technique to filter out the higher order modes reflected from the FBG written in microfibres via a linear taper region while the fundamental mode re-couples to the core. By using this technique, reflection from the microfibre Bragg grating (MFBG) can be effectively single mode, simplifying the demultiplexing and demodulation processes. MFBG exhibits high sensitivity to contact force and an MFBG-based force sensor was also constructed and tested to investigate their suitability for use as an invasive surgery device. Performance of the contact force sensor packaged in a conforming elastomer material compares favourably to one of the best-performing commercial contact force sensors in catheterization applications. The proposed sensor features extremely high sensitivity up to 1.37-mN, miniature size (2.4-mm) that meets standard specification, excellent linearity, low hysteresis, and magnetic resonance imaging compatibility.

Chung, Kit Man

382

Data analysis techniques  

NASA Technical Reports Server (NTRS)

A large and diverse number of computational techniques are routinely used to process and analyze remotely sensed data. These techniques include: univariate statistics; multivariate statistics; principal component analysis; pattern recognition and classification; other multivariate techniques; geometric correction; registration and resampling; radiometric correction; enhancement; restoration; Fourier analysis; and filtering. Each of these techniques will be considered, in order.

Park, Steve

1990-01-01

383

Detection of stressed oil palms from an airborne sensor using optimized spectral indices  

Microsoft Academic Search

Existing vegetation indices and red-edge techniques have been widely used for the assessment of vegetation status and vegetation health from remote-sensing instruments. This study proposed and applied optimized Airborne Imaging Spectrometer for Applications (AISA) airborne hyperspectral indices in assessing and mapping stressed oil palm trees. Six vegetation indices, four red-edge techniques, a standard supervised classifier and three optimized AISA spectral

Helmi Zulhaidi M. Shafri; Nasrulhapiza Hamdan; Mohamad Izzuddin Anuar

2012-01-01

384

Rangeland health attributes and indicators for qualitative assessment  

USGS Publications Warehouse

Panels of experts from the Society for Range Management and the National Research Council proposed that status of rangeland ecosystems could be ascertained by evaluating an ecological site's potential to conserve soil resources and by a series of indicators for ecosystem processes and site stability. Using these recommendations as a starting point, we developed a rapid, qualitative method for assessing a moment-in-time status of rangelands. Evaluators rate 17 indicators to assess 3 ecosystem attributes (soil and site stability, hydrologic function, and biotic integrity) for a given location. Indicators include rills, water flow patterns, pedestals and terracettes, bare ground, gullies, wind scour and depositional areas, litter movement, soil resistance to erosion, soil surface loss or degradation, plant composition relative to infiltration, soil compaction, plant functional/structural groups, plant mortality, litter amount, annual production, invasive plants, and reproductive capability. In this paper, we detail the development and evolution of the technique and introduce a modified ecological reference worksheet that documents the expected presence and amount of each indicator on the ecological site. In addition, we review the intended applications for this technique and clarify the differences between assessment and monitoring that lead us to recommend this technique be used for moment-in-time assessments and not be used for temporal monitoring of rangeland status. Lastly, we propose a mechanism for adapting and modifying this technique to reflect improvements in understanding of ecosystem processes. We support the need for quantitative measures for monitoring rangeland health and propose some measures that we believe may address some of the 17 indicators.

Pyke, David A.; Herrick, J.E.; Pellant, Mike

2002-01-01

385

Passivity indices for symmetrically interconnected distributed systems  

Microsoft Academic Search

In this paper, the passivity indices for both lin- ear and nonlinear multi-agent systems with feedforward and feedback interconnections are derived. For linear systems, the passivity indices are explicitly characterized, while the passivity indices in the nonlinear case are characterized by a set of matrix inequalities. We also focus on symmetric interconnections and specialize the passivity indices results to this

Po Wu; Panos J. Antsaklis

2011-01-01

386

Improved Search Techniques  

NASA Technical Reports Server (NTRS)

Thousands of millions of documents are stored and updated daily in the World Wide Web. Most of the information is not efficiently organized to build knowledge from the stored data. Nowadays, search engines are mainly used by users who rely on their skills to look for the information needed. This paper presents different techniques search engine users can apply in Google Search to improve the relevancy of search results. According to the Pew Research Center, the average person spends eight hours a month searching for the right information. For instance, a company that employs 1000 employees wastes $2.5 million dollars on looking for nonexistent and/or not found information. The cost is very high because decisions are made based on the information that is readily available to use. Whenever the information necessary to formulate an argument is not available or found, poor decisions may be made and mistakes will be more likely to occur. Also, the survey indicates that only 56% of Google users feel confident with their current search skills. Moreover, just 76% of the information that is available on the Internet is accurate.

Albornoz, Caleb Ronald

2012-01-01

387

Linear regression analysis of survival data with missing censoring indicators  

PubMed Central

Linear regression analysis has been studied extensively in a random censorship setting, but typically all of the censoring indicators are assumed to be observed. In this paper, we develop synthetic data methods for estimating regression parameters in a linear model when some censoring indicators are missing. We define estimators based on regression calibration, imputation, and inverse probability weighting techniques, and we prove all three estimators are asymptotically normal. The finite-sample performance of each estimator is evaluated via simulation. We illustrate our methods by assessing the effects of sex and age on the time to non-ambulatory progression for patients in a brain cancer clinical trial. PMID:20559722

Wang, Qihua

2010-01-01

388

The indicator performance estimate approach to determining acceptable wilderness conditions  

NASA Astrophysics Data System (ADS)

Using data from a study conducted in the Cranberry Wilderness Area of West Virginia, United States, this paper describes how a modified importance—performance approach can be used to prioritize wilderness indicators and determine how much change from the pristine is acceptable. The approach uses two key types of information: (1) indicator importance, or visitor opinion as to which wilderness indicators have the greatest influence on their experience, and (2) management performance, or the extent to which actual indicator conditions exceed or are within visitor expectations. Performance was represented by calculating indicator performance estimates (IPEs), as defined by standardized differences between actual conditions and visitor preferences for each indicator. The results for each indicator are then presented graphically on a four-quadrant matrix for objective interpretation. Each quadrant represents a management response: keep up the good work, concentrate here, low priority, or possible overkill. The technique allows managers to more systematically and effectively utilize information routinely collected during the limits of acceptable change wilderness planning process.

Hollenhorst, Steven; Gardner, Lisa

1994-11-01

389

A simple assay for toxic chemicals using a bacterial indicator  

Microsoft Academic Search

A simple, inexpensive and rapid technique to measure toxicity has been developed using Rhizobium meliloti as the indicator organism and its rapid reduction of the tetrazolium dye MTT (3-[4,5-dimethyl-thiazol-2-yl]-2,5-diphenyltetrazolium bromide). Toxic chemicals inhibited the reduction in this bacterium but not in others. Nearly 50 organic chemicals and 14 minerals were tested: inhibition was proportional to the concentration of the toxic

J. L. Botsford

1998-01-01

390

New Indications in the Approach to the Pendulous Abdomen  

Microsoft Academic Search

.   The appearance of the superficial liposuction technique has permitted the surgeon to advance in his indications for treating\\u000a localized lipodystrophy, without skin resection. With the cutaneous retraction phenomenon that follows superficial liposuction,\\u000a pendulous abdomen, which was once treated by classical dermolipectomies, can now be treated with liposuction alone, obtaining\\u000a satisfactory results. The authors recommend this form of treatment for

Jorge Planas; Beatriz B. Morais

1999-01-01

391

Performance Evaluation of Some Clustering Algorithms and Validity Indices  

Microsoft Academic Search

In this article, we evaluate the performance of three clustering algorithms, hard K-Means, single linkage, and a simulated annealing (SA) based technique, in conjunction with four cluster validity indices, namely Davies-Bouldin index, Dunn's index, Calinski-Harabasz index, and a recently developed indexI. Based on a relation between the indexI and the Dunn's index, a lower bound of the value of the

Ujjwal Maulik; Sanghamitra Bandyopadhyay

2002-01-01

392

Prefabricated composite veneers: historical perspectives, indications and clinical application.  

PubMed

Veneering anterior teeth is a well-established technique, which was brought to Dentistry by Dr Pincus as early as 1937. From the mid-1970s, boosted by the development of composites and adhesive techniques, various concepts emerged including direct composite restorations, prefabricated composite veneers and of course, individualized porcelain indirect veneers. The prefabricated composite veneer option was however soon abandoned due to former technological limitations. Recently, the creation of a new shade guide comprising enamel shells revitalized this "old idea," and in combination with a high pressure and temperature molding process followed by a laser surface vitrification, a novel, improved composite prefabricated system (Venear, Edelweiss Dentistry) was born. This paper provides an overview of the potential indications and clinical protocol of this original veneering technique. PMID:21734966

Dietschi, Didier; Devigus, Alessandro

2011-01-01

393

Assessor Training Assessment Techniques  

E-print Network

NVLAP Assessor Training Assessment Techniques: Communication Skills and Conducting an Assessment listener ·Knowledgeable Assessor Training 2009: Assessment Techniques: Communication Skills & Conducting, truthful, sincere, discrete · Diplomatic · Decisive · Selfreliant Assessor Training 2009: Assessment

394

Seals and Sealing Techniques  

NASA Technical Reports Server (NTRS)

Developments by the aerospace industry in seals and sealing techniques are announced for possible use in other areas. The announcements presented are grouped as: sealing techniques for cryogenic fluids, high pressure applications, and modification for improved performance.

1972-01-01

395

Nondestructive evaluation technique guide  

NASA Technical Reports Server (NTRS)

A total of 70 individual nondestructive evaluation (NDE) techniques are described. Information is presented that permits ease of comparison of the merits and limitations of each technique with respect to various NDE problems. An NDE technique classification system is presented. It is based on the system that was adopted by the National Materials Advisory Board (NMAB). The classification system presented follows the NMAB system closely with the exception of additional categories that have been added to cover more advanced techniques presently in use. The rationale of the technique is explained. The format provides for a concise description of each technique, the physical principles involved, objectives of interrogation, example applications, limitations of each technique, a schematic illustration, and key reference material. Cross-index tabulations are also provided so that particular NDE problems can be referred to appropriate techniques.

Vary, A.

1973-01-01

396

Programming Techniques for Supercomputers  

E-print Network

Programming Techniques for Supercomputers (PTfS2007) Getting Started Revision : 1.2 Programming Techniques for Supercomputers (PTfS2007) Getting Started -- Please Read! 1 Login to the HPC machines at RRZE.Zeiser@rrze.uni-erlangen.de Tel. 85-28737 #12;Programming Techniques for Supercomputers (PTfS2007) Getting Started Revision : 1

Fiebig, Peter

397

Programming Techniques for Supercomputers  

E-print Network

Programming Techniques for Supercomputers (PTfS2006) Getting Started Revision : 1.6 Programming Techniques for Supercomputers (PTfS2006) Getting Started 1 Login to the HPC machines at RRZE Course logins. 85­28973 #12; Programming Techniques for Supercomputers (PTfS2006) Getting Started Revision : 1.6 3

Stummer, Wolfgang

398

Pelvic fractures: part 2. Contemporary indications and techniques for definitive surgical management.  

PubMed

Once the patient with pelvic fracture is resuscitated and stabilized, definitive surgical management and anatomic restoration of the pelvic ring become the goal. Understanding injury pattern by stress examination with the patient under anesthesia helps elucidate the instability. Early fixation of the unstable pelvis is important for mobilization, pain control, and prevention of chronic instability or deformity. Current pelvic fracture management employs a substantial amount of percutaneous reduction and fixation, with less emphasis placed on pelvic reconstruction proceeding from posterior to anterior, and most reduction and fixation of unstable pelvic fractures done with the patient supine. Compared with control subjects with acetabular fracture or pelvic fracture alone, patients with combined injury have a significantly higher Injury Severity Score, lower systolic blood pressure, and higher mortality rates; they are also transfused more packed red blood cells. Even with anatomic restoration of the pelvis, long-term outcomes after severe pelvic trauma are below population norms. The most common chronic problems relate to sexual dysfunction and pain. Regardless of fracture type, neurologic injury is a universal harbinger of poor outcome. PMID:23908252

Langford, Joshua R; Burgess, Andrew R; Liporace, Frank A; Haidukewych, George J

2013-08-01

399

Indications, technique, and clinical use of ambulatory 24-hour esophageal motility monitoring in a surgical practice.  

PubMed Central

The development of miniaturized electronic pressure transducers and portable digital data recorders with large storage capacity has made ambulatory monitoring of esophageal motor function over an entire circadian cycle possible. The broad clinical application of this new technology in a large number of asymptomatic normal volunteers and patients with primary esophageal motor disorders or gastroesophageal reflux disease provides new insights into esophageal motor function in health and disease under a variety of physiologic conditions. In normal volunteers and symptomatic patients, esophageal motor activity increases with both the state of consciousness and eating activity, i.e., from sleep to awake to meal periods. In the normal situation there is a higher prevalence of nonperistaltic esophageal contractions than appreciated on stationary manometry. Compared with standard manometry, ambulatory esophageal manometry provides a more than 100-fold larger database for the classification and quantitation of abnormal esophageal motor function and leads to a change in the diagnosis in a substantial portion of patients with symptoms suggestive of a primary esophageal motor disorder. In patients with nonobstructive dysphagia, the circadian esophageal motility pattern is characterized by an inability to organize the motor activity into peristaltic contractions during meal periods. In patients with noncardiac chest pain, ambulatory motility monitoring can document a direct correlation of abnormal esophageal motor activity with the symptom and shows that the abnormal motor activity immediately preceding the pain episodes is characterized by an increased frequency of simultaneous, double- and triple-peaked, high-amplitude, and long-duration contractions. A long esophageal myotomy can abolish the ability of the esophagus to produce this abnormal motor pattern. In patients with gastroesophageal reflux disease, ambulatory motility monitoring shows that the contractility of the esophageal body deteriorates with increasing severity of esophageal mucosal injury, compromising the clearance function of the esophageal body. These data suggest that ambulatory esophageal motility monitoring allows for a more precise classification of esophageal motor disorders than standard manometry and can identify abnormal esophageal motor pattern associated with nonobstructive dysphagia, noncardiac chest pain, or gastroesophageal reflux. Ambulatory esophageal manometry therefore should replace standard manometry in the assessment of esophageal body function and has potential to improve the diagnosis and management of patients with esophageal motor abnormalities. The combination of ambulatory 24-hour esophageal manometry with esophageal and gastric pH monitoring is currently the most physiologic way to assess patients with functional foregut disorders. PMID:8439211

Stein, H J; DeMeester, T R

1993-01-01

400

[Indications and technique of combined medial and lateral column procedures in severe extrinsic elbow contractures].  

PubMed

Severe extrinsic elbow contracture can be treated effectively using elbow arthrolysis to obtain satisfactory results. Preoperative planing is of prime importance to evaluate joint involvement and to decide how to approach the capsule from the lateral or medial aspect of the elbow. Most of the time because of the extensive involvement of the periarticular tissue, a combined approach is usually preferred. It is a step-by-step procedure that must be adapted to the progressive gain of motion. The ulnar nerve must be identified systematically and often anteriorly transposed. Maximum gain of motion must be obtained at surgery because loss of elbow motion after surgery is common. Postoperative management must be closely followed static splint being preferable to active physiotherapy. Results of surgical arthrolysis for extrinsic stiffness is often satisfactory with an absolute gain in the flexion-extension arc between 30 and 60°. PMID:21472425

Mansat, P; Bonnevialle, N; Werner, B

2011-04-01

401

The Transcervical Approach for Parapharyngeal Space Pleomorphic Adenomas: Indications and Technique  

PubMed Central

Background Head and Neck Parapharyngeal space tumors are rare. Pleomorphic Adenomas are the most common Parapharyngeal space tumors. The purpose of this study was to define preoperative criteria for enabling full extirpation of parapharyngeal space pleomorphic adenomas via the transcervical approach while minimizing functional and cosmetic morbidity. Methods The surgical records and medical charts of 19 females and 10 males with parapharyngeal space pleomorphic adenomas operated between 1993 and 2012 were reviewed. Results Fifteen patients were operated by a simple transcervical approach, 13 by a transparotid transcervical approach, and one by a transmandibular transcervical approach. Complications included facial nerve paralysis, infection, hemorrhage and first bite syndrome. There were three recurrences, but neither recurrence nor complications were associated with the type of surgical approach. Conclusion A simple transcervical approach is preferred for parapharyngeal space pleomorphic adenomas with narrow attachments to the deep lobe of the parotid gland and for pleomorphic adenomas originating in a minor salivary gland within the parapharyngeal space. PMID:24587286

Horowitz, Gilad; Ben-Ari, Oded; Wasserzug, Oshri; Weizman, Noam; Yehuda, Moshe; Fliss, Dan M.

2014-01-01

402

DEVELOPMENT OF BIOLOGICAL INDICATORS, METHODS AND ASSESSMENT TECHNIQUES FOR USE IN HEADWATER INTERMITTENT STREAMS  

EPA Science Inventory

Despite representing the most abundant and widespread of our nation's surface waters, regions, states and tribes have received little guidance specific to headwater intermittent streams from the U.S. EPA. Headwater streams lie at the terrestrial-aquatic interface both spatially,...

403

Cardiopulmonary bypass/extracorporeal membrane oxygenation/left heart bypass: indications, techniques, and complications.  

PubMed

Cardiopulmonary bypass has revolutionized the ability to provide cardiorespiratory support and has advanced the field of cardiac surgery. This invention has given surgeons the ability to perform many procedures that were not possible previously. The concept and development of cardiopulmonary bypass has been pioneered by numerous legendary surgeons. Cardiopulmonary bypass, extracorporeal membrane oxygenation, and left heart bypass have revolutionized our ability to operate on the heart, great vessels, and aorta in addition to providing means of short-term support for reversible causes of cardiac and/or respiratory failure. The success of these approaches is dependent upon excellent communication between the surgeon, perfusionist, and anesthesiologist as well as constant vigilance and troubleshooting by the caregivers. PMID:19782837

Ailawadi, Gorav; Zacour, Richard K

2009-08-01

404

Vocal Fold Injection: Review of Indications, Techniques, and Materials for Augmentation  

PubMed Central

Vocal fold injection is a procedure that has over a 100 year history but was rarely done as short as 20 years ago. A renaissance has occurred with respect to vocal fold injection due to new technologies (visualization and materials) and new injection approaches. Awake, un-sedated vocal fold injection offers many distinct advantages for the treatment of glottal insufficiency (vocal fold paralysis, vocal fold paresis, vocal fold atrophy and vocal fold scar). A review of materials available and different vocal fold injection approaches is performed. A comparison of vocal fold injection to laryngeal framework surgery is also undertaken. With proper patient and material selection, vocal fold injection now plays a major role in the treatment of many patients with dysphonia. PMID:21217957

Mallur, Pavan S.

2010-01-01

405

ECOLOGICAL INDICATORS IN RISK ASSESSMENT WORKSHOP SUMMARY  

EPA Science Inventory

Ecological indicators can be defined as relatively simple measurements that relay scientific information about complex ecosystems. Such indicators are used to characterize risk in ecological risk assessment (ERA) and to mark progress toward resource management goals. In late 1997...

406

ECOLOGICAL INDICATORS IN RISK ASSESSMENT: WORKSHOP SUMMARY  

EPA Science Inventory

Ecological indicators can be defined as relatively simple measurements that relay scientific information about complex ecosystems. Such indicators are used to characterize risk in ecological risk assessment and to mark progress toward resource management goals. In late 1997 scien...

407

THE MULTIDISCIPLINARY INFLUENCE OF COMMON SUSTAINABILITY INDICES  

EPA Science Inventory

Sustainability is often poorly defined and difficult to measure. We describe several concepts based in ecology, economics, and physics that have contributed to sustainability indices, and discuss their positive and negative aspects. Indices range from mostly ecological (such as e...

408

The Current Status of Primary Distance Indicators  

E-print Network

A review is given of the current status of the primary distance indicators. The relevance of these indicators for determining the local expansion rate and the age of globular clusters is briefly outlined.

Michael Feast

2004-05-22

409

LANDSCAPE SCALE INDICATORS OF MINING ACTIVITY  

EPA Science Inventory

Ecological indicators of stress are used by the Environmental Monitoring and Assessment Program (EMAP) to quantify the status, trends and changes of ecological goods and services. The purpose of developing landscape indicators of stress is to identify environmental and ecological...

410

A note regarding the projections of some major health indicators.  

PubMed

There are various methods to get some projections of health indicators that do not always produce satisfactory results. Our aim is to establish the rules for obtaining reliable projections, using simple models. In the procedure proposed here, there is no need, as in many other techniques, to directly connect the levels of the indicator under consideration with other social, behavioral, economic, medical, and environmental determinants, to get future projections. For this purpose, we will consider an indicator that seems to have a trajectory that is rather difficult to simulate. This indicator refers to the causes of mortality from cerebrovascular diseases (deaths per 100,000 population) in Greece and Portugal. Both series are not stationary, but they are integrated in the sense that they produce a stationary series by differencing them. The application of the techniques proposed here is based on the identification of the variables used, that is, whether they are I(1) (integrated of order 1), or I(0) (ie, stationary), to get acceptable projections using simple models, which can be easily estimated. It is also necessary to perform ex post forecasting tests, to select the most suitable model. Detailed results are graphically presented, to better anticipate the forecasting power of the models used, in combination with the status of each series considered, that is, whether it is I(1) or I(0). PMID:16849990

Mouza, Anna-Maria

2006-01-01

411

Laboratory Indices of Nutritional Status in Pregnancy.  

ERIC Educational Resources Information Center

This report reviews the current state of knowledge regarding laboratory indices of nutritional and metabolic status during normal pregnancy in order to provide normative data with respect to such indices in healthy pregnant women. The report contains seven chapters: Physiologic Adjustments in General; Hematologic Indices; Electrolytes in Normal…

National Academy of Sciences-National Research Council, Washington, DC. Food and Nutrition Board.

412

Ecological Indicators for the Nation (2000)  

NSDL National Science Digital Library

The National Academy Press (of the National Academies) has posted this Open Book (for browsing only), from the Committee to Evaluate Indicators for Monitoring Aquatic and Terrestrial Environments (National Research Council). The text provides criteria and methodologies for selecting and developing ecological indicators; proposes several ecological indicators and relevant data sources; and suggests ways to gather, store, interpret, and communicate information from ecological monitoring.

National Research Council (U.S.). Board on Atmospheric Sciences and Climate.

2000-01-01

413

Educational Indicators: Monitoring the State of Education.  

ERIC Educational Resources Information Center

The l975 Educational Testing Service (ETS) Invitational Conference provided an overview of the social indicators movement, and the relationship between schooling and quality of life. The concept of educational indicators was discussed. Educational indicators are defined as statistics used to provide information regarding the status of particular…

Educational Testing Service, Princeton, NJ.

414

Evaluation of Mesoscale Model Phenomenological Verification Techniques  

NASA Technical Reports Server (NTRS)

Forecasters at the Spaceflight Meteorology Group, 45th Weather Squadron, and National Weather Service in Melbourne, FL use mesoscale numerical weather prediction model output in creating their operational forecasts. These models aid in forecasting weather phenomena that could compromise the safety of launch, landing, and daily ground operations and must produce reasonable weather forecasts in order for their output to be useful in operations. Considering the importance of model forecasts to operations, their accuracy in forecasting critical weather phenomena must be verified to determine their usefulness. The currently-used traditional verification techniques involve an objective point-by-point comparison of model output and observations valid at the same time and location. The resulting statistics can unfairly penalize high-resolution models that make realistic forecasts of a certain phenomena, but are offset from the observations in small time and/or space increments. Manual subjective verification can provide a more valid representation of model performance, but is time-consuming and prone to personal biases. An objective technique that verifies specific meteorological phenomena, much in the way a human would in a subjective evaluation, would likely produce a more realistic assessment of model performance. Such techniques are being developed in the research community. The Applied Meteorology Unit (AMU) was tasked to conduct a literature search to identify phenomenological verification techniques being developed, determine if any are ready to use operationally, and outline the steps needed to implement any operationally-ready techniques into the Advanced Weather Information Processing System (AWIPS). The AMU conducted a search of all literature on the topic of phenomenological-based mesoscale model verification techniques and found 10 different techniques in various stages of development. Six of the techniques were developed to verify precipitation forecasts, one to verify sea breeze forecasts, and three were capable of verifying several phenomena. The AMU also determined the feasibility of transitioning each technique into operations and rated the operational capability of each technique on a subjective 1-10 scale: (1) 1 indicates that the technique is only in the initial stages of development, (2) 2-5 indicates that the technique is still undergoing modifications and is not ready for operations, (3) 6-8 indicates a higher probability of integrating the technique into AWIPS with code modifications, and (4) 9-10 indicates that the technique was created for AWIPS and is ready for implementation. Eight of the techniques were assigned a rating of 5 or below. The other two received ratings of 6 and 7, and none of the techniques a rating of 9-10. At the current time, there are no phenomenological model verification techniques ready for operational use. However, several of the techniques described in this report may become viable techniques in the future and should be monitored for updates in the literature. The desire to use a phenomenological verification technique is widespread in the modeling community, and it is likely that other techniques besides those described herein are being developed, but the work has not yet been published. Therefore, the AMIU recommends that the literature continue to be monitored for updates to the techniques described in this report and for new techniques being developed whose results have not yet been published. 111

Lambert, Winifred

2006-01-01

415

Developments in functional neuroimaging techniques  

SciTech Connect

A recent review of neuroimaging techniques indicates that new developments have primarily occurred in the area of data acquisition hardware/software technology. For example, new pulse sequences on standard clinical imagers and high-powered, rapidly oscillating magnetic field gradients used in echo planar imaging (EPI) have advanced MRI into the functional imaging arena. Significant developments in tomograph design have also been achieved for monitoring the distribution of positron-emitting radioactive tracers in the body (PET). Detector sizes, which pose a limit on spatial resolution, have become smaller (e.g., 3--5 mm wide) and a new emphasis on volumetric imaging has emerged which affords greater sensitivity for determining locations of positron annihilations and permits smaller doses to be utilized. Electromagnetic techniques have also witnessed growth in the ability to acquire data from the whole head simultaneously. EEG techniques have increased their electrode coverage (e.g., 128 channels rather than 16 or 32) and new whole-head systems are now in use for MEG. But the real challenge now is in the design and implementation of more sophisticated analyses to effectively handle the tremendous amount of physiological/anatomical data that can be acquired. Furthermore, such analyses will be necessary for integrating data across techniques in order to provide a truly comprehensive understanding of the functional organization of the human brain.

Aine, C.J. [Los Alamos National Lab., NM (United States). Biophysics Group

1995-03-01

416

A gas flow indicator for portable life support systems  

NASA Technical Reports Server (NTRS)

A three-part program was conducted to develop a gas flow indicator (GFI) to monitor ventilation flow in a portable life support system. The first program phase identified concepts which could potentially meet the GFI requirements. In the second phase, a working breadboard GFI, based on the concept of a pressure sensing diaphragm-aneroid assembly connected to a venturi, was constructed and tested. Extensive testing of the breadboard GFI indicated that the design would meet all NASA requirements including eliminating problems experienced with the ventilation flow sensor used in the Apollo program. In the third program phase, an optimized GFI was designed by utilizing test data obtained on the breadboard unit. A prototype unit was constructed using prototype materials and fabrication techniques, and performance tests indicated that the prototype GFI met or exceeded all requirements.

Bass, R. L., III; Schroeder, E. C.

1975-01-01

417

Fractal Analysis of Prime Indian STOCK Market Indices  

NASA Astrophysics Data System (ADS)

The purpose of the present work is to study the fractal behaviour of prime Indian stock exchanges, namely Bombay Stock Exchange Sensitivity Index (BSE Sensex) and National Stock Exchange (NSE). To analyze the monofractality of these indices we have used Higuchi method and Katz method separately. By applying Mutifractal Detrended Fluctuation Analysis (MFDFA) technique we have calculated the generalized Hurst exponents, multifractal scaling exponents and generalized multifractal dimensions for the present indices. We have deduced Hölder exponents as well as singularity spectra for BSE and NSE. It has been observed that both the stock exchanges are possessing self-similarity at different small ranges separately and inhomogeneously. By comparing the multifractal behaviour of the BSE and NSE indices, we have found that the second one exhibits a richer multifractal feature than the first one.

Samadder, Swetadri; Ghosh, Koushik; Basu, Tapasendra

2013-03-01

418

Bibliometric indicators: quality measurements of scientific publication.  

PubMed

Bibliometrics is a set of mathematical and statistical methods used to analyze and measure the quantity and quality of books, articles, and other forms of publications. There are three types of bibliometric indicators: quantity indicators, which measure the productivity of a particular researcher; quality indicators, which measure the quality (or "performance") of a researcher's output; and structural indicators, which measure connections between publications, authors, and areas of research. Bibliometric indicators are especially important for researchers and organizations, as these measurements are often used in funding decisions, appointments, and promotions of researchers. As more and more scientific discoveries occur and published research results are read and then quoted by other researchers, bibliometric indicators are becoming increasingly important. This article provides an overview of the currently used bibliometric indicators and summarizes the critical elements and characteristics one should be aware of when evaluating the quantity and quality of scientific output. PMID:20413749

Durieux, Valérie; Gevenois, Pierre Alain

2010-05-01

419

Proper Injection Techniques in Dairy Cattle  

E-print Network

E-567 05-09 Proper Injection Techniques in Dairy Cattle I t is very important to administer medications to dairy cattle in the proper way. That means using the correct drug, dosage and injection technique; handling animals... labeled for use in dairy ? cattle. Refer to the vaccine label for this information. Using a vaccine in an animal species for which it is not labeled is illegal. Give the proper dosage as indicated on the label. ? Always give an injection in the body...

Villarino, Mario A.

2009-05-04

420

Visualization Techniques for Single Channel DPF Systems  

SciTech Connect

New techniques have been developed to visualize soot deposition in both traditional and new diesel particulate filter (DPF) substrate materials using a modified cyanoacrylate fuming technique. Loading experiments have been conducted on a variety of single channel DPF substrates to develop a deeper understanding of soot penetration, soot deposition characteristics, and to confirm modeling results. Early results indicate that stabilizing the soot layer using a vapor adhesive may allow analysis of the layer with new methods.

Dillon, Heather E.; Maupin, Gary D.; Carlson, Shelley J.; Saenz, Natalio T.; Gallant, Thomas R.

2007-04-01

421

Restorer: A Visualization Technique for Handling Missing Data  

NSDL National Science Digital Library

Restorer is a visualization technique for indicating the location of missing data in a scientific visualization. Rather than filling missing data regions with interpolated data colored with the same scale as real data or simply leaving such regions empty, the restorer technique fills the regions with interpolated data colored with a color table with only luminance values. This technique allows missing data to be indicated clearly without distracting from the content of the real data.

John Cavallo

1994-08-24

422

Plant Tissue Culture Techniques  

NSDL National Science Digital Library

Plant tissue culture techniques are essential to many types of academic inquiry, as well as to many applied aspects of plant science. Currently, tissue-cultured plants that have been genetically engineered provide insight into plant molecular biology and gene regulation. Plant tissue culture techniques are also central to innovative areas of applied plant science, including plant biotechnology and agriculture. Thus, tissue culture techniques have been, and still are, prominent in academic and applied plant science.

Lorraine Mineo (Lafayette College; )

1989-06-06

423

March 2011 Physical Indicators Workshop Summary Report  

NASA Technical Reports Server (NTRS)

The National Climate Assessment (NCA) convened a workshop on Physical Climate Indicators from 29-30 March 2011, as part of a series on Monitoring Climate Change and its Impacts . The overarching goal of this workshop was to identify a few broad categories of potential physical climate indicators using a set of priorities developed by the NCA, and to provide a clear justification for how they would inform the Nation about climate change. Additional goals included providing input on the overall NCA framework for selecting the indicators and suggesting methodologies to construct indicators. Although one of the workshop goals was to address the status of current observational networks to support indicators, this was not a main focus of any single discussion. However, participants agreed with the NCA indicator vision that high quality data were needed to develop indicators, and generally focused on identifying indicator categories that current observation systems could support. The nearly 60 participants, primarily from Federal agencies, received a white paper in advance of the workshop that detailed the NCA vision for a coordinated suite of climate-related physical, ecological, and societal indicators. The intent of these national indicators of change is to develop a way to evaluate and communicate over time both the rate of change in impacts and the capacity to respond to climate drivers. These indicators will be tracked as a part of ongoing, long-term assessment activities, with adjustments as necessary to adapt to changing conditions and understanding. An initial framework was provided to workshop participants to ensure that everyone understood the audience, scope, and purpose of the indicators. A common lexicon was defined since indicator terminology varies widely. In addition, several potential approaches to grouping or categorizing the indicators were presented. Participants spent most of their time in small breakout groups with facilitators, working to address a common set of questions. The workshop was structured to start with the broadest issue and then focus down as the workshop progressed. The first breakout therefore solicited comments on the NCA indicator framework, followed by discussion of the potential approaches to organizing the physical climate indicators. Once several approaches were identified, the groups then worked to define specific measurements, or types of measurements, that could be used to create the indicators.

Roberts, Brent

2011-01-01

424

Combined guidance technique using angioscope and fluoroscope images for CO laser angioplasty: in-vivo animal experiment  

NASA Astrophysics Data System (ADS)

The combined guidance technique using angioscope and fluoroscope (i.e. angiography) images for CO laser angioplasty was demonstrated in vivo animal experiment. The newly developed total occlusion model which has been produced by a long term transplantation of ChitinR tube in canine femoral artery was ablated by the contact irradiation of CO laser. A thin laser angioscope catheter, 5F in outer diameter, was inserted from total carotid artery to femoral artery by selective catheterization technique under fluoroscopy. A thin CO laser cable of which diameter was less than 0.6mm was advanced from the tip of the angioscope catheter. A As-S chalcogenide glass fiber of which diameter was 200micrometers was installed in the laser cable. The laser cable connected to the CO laser device which was developed for medical use. The angioscope catheter and laser cable could be seen by the fluoroscopy. The authors used the angioscope image of the occlusion end and the angiography image to check the direction of ablation hole. The simultaneous use of these images which include quite different kinds of information was extremely useful for the safety guidance of laser angioplasty for total occlusion. The histological specimen from the ablated occlusion showed that the repetitive ablation procedure made a larger lumen than the laser cable diameter.

Arai, Tsunenori; Mizuno, Kyoichi; Sakurada, Masami; Miyamoto, Akira; Arakawa, Koh; Kurita, Akira; Suda, Akira; Kikuchi, Makoto; Nakamura, Haruo; Utsumi, Atsushi; Akai, Yoshiro; Takeuchi, Kiyoshi

1991-05-01

425

Effectiveness of vasectomy techniques.  

PubMed

The effectiveness of various vasectomy techniques is reviewed, with a focus on methods used for vas occlusion. Spontaneous recanalization of the vas is more common than generally recognized and is often transient. Simple ligation and excision has an unacceptably high risk for failure. Techniques that include cautery seem to have a lower risk for failure than techniques that do not include cautery. There is insufficient evidence to recommend a particular standardized cautery technique, but adding fascial interposition to cautery seems to be associated with the lowest risk for failure. PMID:19643234

Sokal, David C; Labrecque, Michel

2009-08-01

426

Reliability of indicators of decline in abundance.  

PubMed

Although there are many indicators of endangerment (i.e., whether populations or species meet criteria that justify conservation action), their reliability has rarely been tested. Such indicators may fail to identify that a population or species meets criteria for conservation action (false negative) or may incorrectly show that such criteria have been met (false positive). To quantify the rate of both types of error for 20 commonly used indicators of declining abundance (threat indicators), we used receiver operating characteristic curves derived from historical (1938-2007) data for 18 sockeye salmon (Oncorhynchus nerka) populations in the Fraser River, British Columbia, Canada. We retrospectively determined each population's yearly status (reflected by change in abundance over time) on the basis of each indicator. We then compared that population's status in a given year with the status in subsequent years (determined by the magnitude of decline in abundance across those years). For each sockeye population, we calculated how often each indicator of past status matched subsequent status. No single threat indicator provided error-free estimates of status, but indicators that reflected the extent (i.e., magnitude) of past decline in abundance (through comparison of current abundance with some historical baseline abundance) tended to better reflect status in subsequent years than the rate of decline over the previous 3 generations (a widely used indicator). We recommend that when possible, the reliability of various threat indicators be evaluated with empirical analyses before such indicators are used to determine the need for conservation action. These indicators should include estimates from the entire data set to take into account a historical baseline. PMID:22741815

Porszt, Erin J; Peterman, Randall M; Dulvy, Nicholas K; Cooper, Andrew B; Irvine, James R

2012-10-01

427

R2 Indicator-Based Multiobjective Search.  

PubMed

In multiobjective optimization, set-based performance indicators are commonly used to assess the quality of a Pareto front approximation. Based on the scalarization obtained by these indicators, a performance comparison of multiobjective optimization algorithms becomes possible. The R2 and the hypervolume (HV) indicator represent two recommended approaches which have shown a correlated behavior in recent empirical studies. Whereas the HV indicator has been comprehensively analyzed in the last years, almost no studies on the R2 indicator exist. In this extended version of our previous conference paper, we thus perform a comprehensive investigation of the properties of the R2 indicator in a theoretical and empirical way. The influence of the number and distribution of the weight vectors on the optimal distribution of ? solutions is analyzed. Based on a comparative analysis, specific characteristics and differences of the R2 and HV indicator are presented. Furthermore, the R2 indicator is integrated into an indicator-based steady-state evolutionary multiobjective optimization algorithm (EMOA). It is shown that the so-called R2-EMOA can accurately approximate the optimal distribution of ? solutions regarding R2. PMID:24983593

Brockhoff, Dimo; Wagner, Tobias; Trautmann, Heike

2014-07-01

428

21 CFR 870.1660 - Indicator injector.  

Code of Federal Regulations, 2013 CFR

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES CARDIOVASCULAR DEVICES Cardiovascular Diagnostic Devices § 870.1660 Indicator injector. (a) Identification. An...

2013-04-01

429

Retroperitoneoscopic renal biopsy: still a good indication!  

PubMed

The histological evaluation of the renal parenchyma is often essential in cases of several renal diseases and provides useful information in determining the prognosis and guiding treatment. In patients with contraindications to percutaneous kidney biopsy, retroperitoneal laparoendoscopic single-site surgery (LESS) is to be preferred as a minimally invasive technique. However, there are cases in which the LESS technique is difficult to perform, especially given that the learning curve is not optimal. We present a case of a Jehovah's Witness patient with severe obesity, in whom conventional retroperitoneal laparoscopic renal biopsy was preferred to the LESS technique. PMID:25198939

Micali, Salvatore; Dandrea, Matteo; De Carne, Cosimo; Martorana, Eugenio; De Stefani, Stefano; Cappelli, Gianni; Bianchi, Giampaolo

2014-12-23

430

Evaluation of heavy water for indicator dilution cardiac output measurement  

SciTech Connect

We evaluated deuterium oxide (D2O) as a tracer for cardiac output measurements. Cardiac output measurements made by thermodilution were compared with those made by indicator dilution with D2O and indocyanine green as tracers. Five triplicate measurements for each method were made at intervals of 30 minutes in each of 9 anesthetized, mechanically ventilated goats. Cardiac output ranged between 0.68 and 3.79 L/min. The 45 data points yielded a correlation coefficient of 0.948 for the comparison of D2O indicator dilution cardiac output measurements with thermodilution measurements and a linear regression slope of 1.046. D2O indicator dilution measurements were biased by -0.11 +/- 0.22 L/min compared with thermodilution measurements and had a standard deviation of +/- 0.12 L/min for triplicate measurements. Hematocrits ranging between 20 and 50 vol% had no effect on optical density for D2O. D2O is more stable than indocyanine green and approximately one-tenth the price (40 cents per injection compared with $4). The basic instrumentation cost of approximately $9,000 is an additional initial expense, but provides the ability to perform pulmonary extravascular water measurements with a double-indicator dilution technique. D2O has potential as a tracer for the clinical determination of indicator dilution cardiac output measurements and pulmonary extravascular water measurements.

Schreiner, M.S.; Leksell, L.G.; Neufeld, G.R. (Univ. of Pennsylvania School of Medicine, Philadelphia (USA))

1989-10-01

431

Maximum-likelihood estimation for indicator dilution analysis.  

PubMed

Indicator-dilution methods are widely used by many medical imaging techniques and by dye-, lithium-, and thermodilution measurements. The measured indicator dilution curves are typically fitted by a mathematical model to estimate the hemodynamic parameters of interest. This paper presents a new maximum-likelihood algorithm for parameter estimation, where indicator dilution curves are considered as the histogram of underlying transit-time distribution. Apart from a general description of the algorithm, semianalytical solutions are provided for three well-known indicator dilution models. An adaptation of the algorithm is also introduced to cope with indicator recirculation. In simulations as well as in experimental data obtained by dynamic contrast-enhanced ultrasound imaging, the proposed algorithm shows a superior parameter estimation accuracy over nonlinear least-squares regression. The feasibility of the algorithm for use in vivo is evaluated using dynamic contrast-enhanced ultrasound recordings obtained with the purpose of prostate cancer detection. The proposed algorithm shows an improved ability (increase in receiver-operating characteristic curve area of up to 0.13) with respect to existing methods to differentiate between healthy tissue and cancer. PMID:24239967

Kuenen, Maarten P J; Herold, Ingeborg H F; Korsten, Hendrikus H M; de la Rosette, Jean J M C H; Wijkstra, Hessel; Mischi, Massimo

2014-03-01

432

MicroSeal systems and modified technique.  

PubMed

The MicroSeal technique was introduced in 1996 and consists of a nickel-titanium (NiTi) spreader, a NiTi condenser, a gutta percha heater, a gutta percha syringe, and a special formulation of gutta percha available in cones or in cartridges. It is considered a thermomechanical compaction technique that uses a rotary instrument to plasticize the gutta percha and move it within the root canal apically and laterally. The MicroSeal technique together with the author's modifications may be a very important tool in the hands of the endodontist. The MicroSeal system is able to preserve a conservative preparation and provide an adequate penetration by the obturation instruments in the apical third. Knowledge of the technique's indications and limitations represents an important step in the learning curve for those practitioners who are willing to incorporate a new obturation method into their clinical techniques. PMID:15066515

Maggiore, Francesco

2004-01-01

433

Interferometric Methods of Measuring Refractive Indices and Double-Refraction of Fibres.  

ERIC Educational Resources Information Center

Presents two methods used to measure the refractive indices and double-refraction of fibers. Experiments are described, with one involving the use of Pluta microscope in the double-beam interference technique, the other employing the multiple-beam technique. Immersion liquids are discussed that can be used in the experiments. (TW)

Hamza, A. A.; El-Kader, H. I. Abd

1986-01-01

434

Monitoring activity in neural circuits with genetically encoded indicators  

PubMed Central

Recent developments in genetically encoded indicators of neural activity (GINAs) have greatly advanced the field of systems neuroscience. As they are encoded by DNA, GINAs can be targeted to genetically defined cellular populations. Combined with fluorescence microscopy, most notably multi-photon imaging, GINAs allow chronic simultaneous optical recordings from large populations of neurons or glial cells in awake, behaving mammals, particularly rodents. This large-scale recording of neural activity at multiple temporal and spatial scales has greatly advanced our understanding of the dynamics of neural circuitry underlying behavior—a critical first step toward understanding the complexities of brain function, such as sensorimotor integration and learning. Here, we summarize the recent development and applications of the major classes of GINAs. In particular, we take an in-depth look at the design of available GINA families with a particular focus on genetically encoded calcium indicators (GCaMPs), sensors probing synaptic activity, and genetically encoded voltage indicators. Using the family of the GCaMP as an example, we review established sensor optimization pipelines. We also discuss practical considerations for end users of GINAs about experimental methods including approaches for gene delivery, imaging system requirements, and data analysis techniques. With the growing toolbox of GINAs and with new microscopy techniques pushing beyond their current limits, the age of light can finally achieve the goal of broad and dense sampling of neuronal activity across time and brain structures to obtain a dynamic picture of brain function. PMID:25538558

Broussard, Gerard J.; Liang, Ruqiang; Tian, Lin

2014-01-01

435

Connecting Indicators with land degradation and desertification  

NASA Astrophysics Data System (ADS)

A series of 72 selected candidate indicators corresponding to the physical environment, social, economic, and land management characteristics were defined in 1672 field sites located in 17 study sites in the Mediterranean and eastern Europe, Latin America, Africa, and Asia. The selected indicators refer to specific farm characteristics such as family status, land tenure, present and previous types of land use, period of existing type of land use, soil depth, slope gradient, tillage operations, tillage depth and direction, etc., as well as to regional characteristics such as annual rainfall, rain seasonality, water availability, water quality and quantity, rate of land abandonment, rate of burned area, etc. Based on existing geo-referenced database, classes have been designated for each indicator and presented in a tabulated form. Weighing indices have been assigned to each class based on existing research or empirically assessing the importance to land degradation and desertification. Various processes or causes related to land degradation and desertification important for the study sites have been studied and the most relevant indicators have been defined. Questionnaires for each process or cause have been prepared and data were collected at field site level in collaboration with land users. The obtained data were statistically analyzed to identify the most important indicators related to each process or cause affecting land degradation and desertification. The analyses have shown that indicators may be widely, even globally, used for assessing the various land degradation and desertification processes or causes at field level. Of course, some indicators related to agriculture, social, and institutional characteristics in some cases show trends that are opposite to what happens in other study sites. These trends can be explained by further investigation including other indicators or processes affecting land degradation and desertification that it was not possible to consider in this effort. Efficiency and performance indicators seem the most promising for further research, particularly combined with economic principles for assessing land degradation and desertification. Key words: Indicators, land degradation, desertification

Kosmas, C.

2012-04-01

436

Alternative surgical dissection techniques.  

PubMed

The bipolar scissors, coblator, harmonic scalpel, and somnoplasty techniques are widely available and offer new choices for the operating arena. There are advantages and disadvantages to all four techniques. With time, these dissection methods will prove their lasting power. Otolaryngologists have already begun to expand their applications and will surely play a role in their use and development. PMID:15823600

Carroll, Thomas; Ladner, Keith; Meyers, Arlen D

2005-04-01

437

Programming Techniques for Supercomputers  

E-print Network

Programming Techniques for Supercomputers (PTfS2005) Exercise 3 05.05.­19.05.2004 1. (1 credit) We. 85-28737 #12;Programming Techniques for Supercomputers (PTfS2005) Exercise 3 05.05.­19.05.2004 3. (4

Fiebig, Peter

438

Vattikuti Institute Prostatectomy: Technique  

Microsoft Academic Search

PurposeWe have performed more than 250 radical prostatectomies using the da Vinci (Intuitive Surgical, Mountain View, California) surgical system. Our initial cases were done using the classic Montsouris approach. However, after gaining familiarity with the robot we modified our technique to reflect our experience with open radical retropubic prostatectomy. We detail the Vattikuti Institute prostatectomy technique that we currently use.

MANI MENON; ASHUTOSH TEWARI; JAMES PEABODY

2003-01-01

439

Emerging Imaging Techniques  

PubMed Central

This article reviews recent developments in selected imaging technologies focused on the cardiovascular system. The techniques covered are: ultrasound biomicroscopy (UBM), microSPECT, microPET, near infrared imaging, and quantum dots. For each technique, the basic physical principles are explained and recent example applications demonstrated. PMID:16614313

McVeigh, Elliot R.

2007-01-01

440

Some structured analysis techniques  

Microsoft Academic Search

Structured analysis advocates have recommended different graphic aids as the foundation technique. Ross has advocated the actigram and datagram (12). DeMarco and Rose have advocated the data flow diagram (DFD) or bubble chart as it is also known (8, 11). Gane and Sarson have advocated a graphic technique they also call the DFD (9).

Ned Chapin

1978-01-01

441

Comprehension of Generative Techniques  

Microsoft Academic Search

A wide variety of tools, techniques, and development methodologies are presently being employed to facilitate the construction of complex software in a timely and cost-efiective fashion. In this context, researchers have demonstrated that a number of design and development goals can be satisfled in a framework in which software artifacts are manipulated through generative techniques based on rewriting. This has

Victor Wintery; Christopher Scalzo; Arpit Jain; Brent Kucera; Azamatbek Mametjanov

442

Techniques for Teachers Section  

ERIC Educational Resources Information Center

Includes a simple technique to demonstrate Millikan's oil drop experiment, an environmental studies experiment to measure dissolved oxygen in water samples, and a technique to demonstrate action-reaction. Science materials described are the Pol-A-Star Tomiscope, Nuffield chemistry film loops, air pucks and pH meters. (JR)

Tait, A., Ed.

1973-01-01

443

Analytical testing techniques  

NASA Technical Reports Server (NTRS)

Structural dynamic analytical testing techniques can be a tool to determine the source of structural dynamic problems and the solution to these problems. Analytical testing techniques are based upon dynamic testing methods and analysis of test results. These methods apply primarily to constructed wind turbine systems. A summary of these methods is presented.

Jones, R.

1978-01-01

444

MRI temporal acceleration techniques.  

PubMed

In recent years, there has been an explosive growth of magnetic resonance imaging (MRI) techniques that allow faster scan speed by exploiting temporal or spatiotemporal redundancy of the images. These techniques improve the performance of dynamic imaging significantly across multiple clinical applications, including cardiac functional examinations, perfusion imaging, blood flow assessment, contrast-enhanced angiography, functional MRI, and interventional imaging, among others. The scan acceleration permits higher spatial resolution, increased temporal resolution, shorter scan duration, or a combination of these benefits. Along with the exciting developments is a dizzying proliferation of acronyms and variations of the techniques. The present review attempts to summarize this rapidly growing topic and presents conceptual frameworks to understand these techniques in terms of their underlying mechanics and connections. Techniques from view sharing, keyhole, k-t, to compressed sensing are covered. PMID:22903655

Tsao, Jeffrey; Kozerke, Sebastian

2012-09-01

445

The Exploration of Indicators of Imagination  

ERIC Educational Resources Information Center

Although early studies in the fields of education and psychology appreciated the value of imagination, little work has been done pertaining to indicators of imagination. This study synthesized early works on imagination done between 1900 and 2011 to clarify its meaning and identify potential indicators. Then, two groups of samples were collected…

Liang, Chaoyun; Chang, Chi-Cheng; Chang, Yuhsuan; Lin, Li-Jhong

2012-01-01

446

Social Indicators: The EU and Social Inclusion  

Microsoft Academic Search

Social indicators are an important tool for evaluating a country's level of social development and for assessing the impact of policy. Such indicators are already in use in investigating poverty and social exclusion in several European countries and have begun to play a significant role in advancing the social dimension of the European Union as a whole. The purpose of

Tony Atkinson; Bea Cantillon; Eric Marlier; Brian Nolan

2002-01-01

447

Comparing southern P indices to runoff data  

Technology Transfer Automated Retrieval System (TEKTRAN)

Forty-eight states in the U.S. have decided to use phosphorus (P) Indices to meet the requirements of their NRCS Code 590 Standard. The majority of the states chose to develop these Indices without consultation or coordination with neighboring states in order to meet specific local conditions and p...

448