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1

Superselective catheterization technique in hepatic angiography  

SciTech Connect

The techniques for superselective catheterization of hepatic artery are described. The catheters have five major configurations in various sizes: (1) simple curve, (2) reverse curve, (3) double curve, (4) modified double curve, and (5) hepatic and splenic curves. Since the celiac artery may be directed caudad, horizontally, or cephalad, the techniques vary accordingly. The basic approach of the system described is to tailor the catheter to fit the vascular anatomy. These various techniques have produced a 95% success rate in the hepatic artery catheterization of 1000 patients.

Chuang, V.P. (Univ. of Texas, Houston); Soo, C.S.; Carrasco, C.H.; Wallace, S.

1983-10-01

2

Basic Surgical Techniques in the Göttingen Minipig: Intubation, Bladder Catheterization, Femoral Vessel Catheterization, and Transcardial Perfusion  

PubMed Central

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 infections6. Transcardial perfusion is the most effective fixation method, and yields preeminent results when preparing minipig organs for histology and histochemistry2,9. 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.com10. For extensive information about porcine anatomy we refer to Nickel et al. Vol. 1-511. 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

3

[Evolution of the catheterization laboratory: new instruments and imaging techniques].  

PubMed

The Editorial Board of the Italian Heart Journal Supplement has planned to publish a series of four consecutive papers focusing on new highlights from the cardiac catheterization laboratory, developments of new devices, coronary imaging and physiological measurement. The first paper on cineless digital angiography and new fluoroscopy systems presented in this issue of the Journal has been prepared by Danzi et al. (Brescia). The paper follows the publication of the Vergara's work (Rovereto-TN) on a similar topic presented last year in a Symposium of the Gruppo Italiano di Studi Emodinamici (GISE) at the XXXI ANMCO meeting. The recent development of cineless digital angiography and the increasing interest in new digital fluoroscopic low energy systems represent a significant change in the management of cardiac images and have significant implications in the organization of a new catheterization laboratory. The second paper will focus on the clinical applications of intravascular ultrasound imaging and will be prepared by Di Mario (Milan). Intravascular ultrasound imaging has significantly contributed to the understanding of vascular adaptation to coronary artery disease and mechanisms of percutaneous coronary interventions. This new diagnostic approach is particularly useful in assessing the early stages of disease, evaluating occult atherosclerosis and guiding the strategy of coronary interventions. Unfortunately, the application of intravascular ultrasound imaging in clinical practice remains limited. The third paper prepared by Verna (Varese) will discuss the new techniques for physiological evaluation of coronary artery disease now available in the catheterization laboratory. The use of pressure and Doppler flow-wire in the assessment of functional significance of individual coronary artery stenoses and in the evaluation of the vasodilatory capacity of coronary microcirculation may provide new insights for the clinical decision at the catheterization table. In addition, the application of myocardial contrast echocardiography with new sonicated agents for intracoronary use may represent a novel approach to the direct evaluation of regional myocardial perfusion and microvascular integrity. Intracoronary stenting has become a widely used and accepted technique in percutaneous coronary interventions. The fourth article of this series, prepared by Silva (Milan), will discuss the advantages and limitations of stenting in different clinical settings based on the results of large clinical trials. In spite of the growing number of procedures safely performed in many countries, long-term results of intracoronary stenting may be sometimes disappointing in selected patients. In-stent restenosis still represents a clinical problem limiting long-term outcome. In addition, the increasing use of new antiplatelet agents in combination with most stenting procedures rise some concern about overall cost of interventions. The objective of this editorial program is to give a view of the changing scenario of the catheterization laboratory with the new methods and devices presently available. There may be significant implications and controversial issues of interest also for all clinical cardiologists. PMID:11255878

Verna, E

2001-02-01

4

A technique for catheterization of the urinary bladder in the ferret.  

PubMed

The technique of catheterization of the urinary bladder, an important clinical skill for the diagnosis of urinary tract disorders, has not been described for the ferret. The bladder was catheterized in 23 ferrets (10 intact females; 11 spayed females; and 2 intact males) using a 3 1/2 French, red rubber urethral catheter fitted with a steel wire stylet. Ferrets were anaesthetized with isoflurane or ketamine (30 mg/kg IM) and xylazine (3 mg/kg IM). Females were positioned in ventral recumbency with the rear quarters elevated by a rolled surgical towel. The urethra was catheterized by direct visualization of the external urethral orifice using a vaginal speculum. The orifice was approximately 1 cm cranial to the clitoral fossa on the ventral floor of the vestibule. Blind passage was used in several spayed females. In males, the distal end of the penis was exteriorized from the prepuce and the external urethral orifice cannulated without stylet. No difficulty was encountered in advancing the catheter past the os penis. This catheterization technique allows urinary tract access for urine collection, pneumocystography, contrast cystography, double contrast cystography, and urine output determination in pharmacologic studies or in critical care of debilitated animals. PMID:8035567

Marini, R P; Esteves, M I; Fox, J G

1994-04-01

5

Arterial Catheterization  

MedlinePLUS

Patient Information Series AMERICAN THORACIC SOCIETY Why Do I Need Arterial Catheterization? Common reasons an arterial catheterization is done include: ? Low blood pressure (hypotension or shock)— Low ...

6

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

7

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

8

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 ...

9

Chronic Left Heart Catheterization for Microvascular Blood Flow Determination in the Rabbit: A Minimally Invasive Technique Using Specially Designed Port Devices  

Microsoft Academic Search

Background: This study describes a modified catheterization technique with subcutaneously implanted port catheters to be inserted in a retrograde manner across the aortic valve into the left heart ventricle through the right carotid artery to measure organ perfusion.Materials and methods. The specially designed arterial port catheters were implanted in New Zealand rabbits (n = 11, 3.7 ± 0.1 kg [mean

Johannes N. Hoffmann; Sonja Steinhagen; Christina Kast; Heinz P. Scheuber; Marianne Jochum; Cornelia Gippner-Steppert; Dietrich Inthorn; Friedrich W. Schildberg; Dirk Nolte

2002-01-01

10

Techniques and indications in radiology  

SciTech Connect

The stated purpose of this book is to review modern radiologic diagnostic techniques as applied to the study of the kidney and urinary tract, and their pertinent indications. This goal is partially accomplished in the first two segments of the book, which consist of about 100 pages. These include a synoptic description of various techniques - including classic uroradiologic studies such as excretory urography and retrograde pyelography, plus sonography, computed tomography, angiography, and nuclear medicine. The diagnostic signs and the differential diagnoses are fairly well described, aided by a profusion of tables and diagrams. The overall quality of the reproduction of the illustrations is good.

Lange, S.

1987-01-01

11

Glidewire-assisted Foley catheter placement: a simple and safe technique for difficult male catheterization  

PubMed Central

Difficulty in Foley catheter placement is a frequently encountered problem. We describe a simple and safe technique for this condition. Rather than using force, which may lead to the formation of a false passage, one should place a glidewire into the bladder through the area of resistance, followed by the placement of a Foley catheter over the glidewire. This is a very easy procedure and can be taught to nurses and nurse practitioners to avoid an unnecessary call for a urologist in the emergency department. PMID:19543460

Chiou, Rei K.; Aggarwal, Himanshu; Chen, Wen

2009-01-01

12

[Colpocleisis: indications, technique and results].  

PubMed

The aim of this review was to summarize recent published data about indications, surgical technique and results of colpocleisis. We conducted a literature search on Medline using PubMed from 1990 to 2008. Anatomical and functional results were assessed for each selected study according to the age and the morbidity of the surgical procedure. As the colpocleisis was complete or partial, anatomic success rates were reported near 100 % with a follow-up ranged from one month to six years. Colpocleisis is an effective procedure for treatment of advanced pelvic organ prolapse in selected patient who no longer desire preservation of coital function. Concomitant anti-incontinence procedure is not associated with increased postoperative morbidity. However, preoperative urodynamics remain to be established for an optimal management of urinary incontinence. PMID:19969275

Misrai, V; Gosseine, P-N; Costa, P; Haab, F; Delmas, V

2009-12-01

13

Suprachoroidal buckling: technique and indications.  

PubMed

The authors herein report the feasibility of suprachoroidal buckling (SCB) procedure as a new approach for treating different forms of retinal detachment (RD) by creating suprachoroidal indentation (buckling effect). With this technique, specially designed devices, i.e. a catheter or cannula, are guided in the suprachoroidal space to reach the target area. Then, a suprachoroidal filler (long lasting hyaluronic acid) is injected to indent the choroid creating SCB, thereby closing retinal tears and supporting the overlying retina. This procedure was performed to treat both myopic tractional maculopathy (MTM), including myopic macular holes, as well as peripheral retinal breaks. SCB may be used alone or in conjunction with vitrectomy. In myopic patients, restoration of retinal layers was achieved in all eyes with myopic foveoschisis. Most eyes with macular hole detachments demonstrated closure of the holes. All peripheral retinal breaks were adequately buckled and closed in a single procedure. The buckling effect was long enough in duration to seal the tears and promote adequate chorioretinal scarring. The procedure was safe and relatively simple in terms of reaching the treatment area and injecting the filler. SCB adds to our surgical options for treating selected cases of peripheral retinal tears and rhegmatogenous RD, and avoids potential problems of episcleral buckles. Moreover it may avoid vitrectomy in selected cases of rhegmatogenous RD. PMID:24653830

El Rayes, Ehab N; Elborgy, Ebrahim

2013-10-01

14

[Enteral nutrition: techniques and indications].  

PubMed

Enteral nutrition must be preferred to parenteral nutrition if case of intact digestive tract. Naso-gastric tubes are frequently used, particularly in enteral feeding. However, the use of naso-enteral tubes, i.e. naso-duodenal and naso-jejunal tubes, is expected to increase in the future. Their efficacy has been demonstrated in two specific cases: intensive care (post-operative or post-traumatic states), acute pancreatitis. A third potential use is in the replacement of a naso-gastric tube by a naso-jejunal tube in cases of frequent aspiration pneumonia related to a gastro-esophageal reflux. Gastro- and jejunostomies have to be indicated when enteral nutrition is thought to be used for more than one month. The insertion of a naso-gastric tube is generally performed by the nurse following medical guidelines and the insertion of a naso-jejunal tube is often done during an endoscopy by the physician. The verification of the correct position of the tube should preferably be done with an X-ray confirmation. However, this is difficult to perform at home and the most frequent method for control is the clinical method by auscultation. Enteral nutrients are generally polymeric and infused with gravity without a peristatic pump excepted in children. In conclusion, technical improvements in enteral nutrition have led to a simple, cost-effective and low risk methods of treatment. PMID:11173710

Guedon, C

2000-12-01

15

Left heart catheterization  

MedlinePLUS

Catheterization - left heart ... to carefully guide the catheters up into your heart and arteries. Dye will be injected into your ... in the blood vessels that lead to your heart. The catheter is the moved through the aortic ...

16

Review of radiation safety in the cardiac catheterization laboratory  

SciTech Connect

With the increasing use of coronary arteriography and interventional procedures, radiation exposure to patients and personnel working in cardiac catheterization laboratories has increased. Proper technique to minimize both patient and operator exposure is necessary. A practical approach to radiation safety in the cardiac catheterization laboratory is presented. This discussion should be useful to facilities with well-established radiation safety programs as well as facilities that require restructuring to cope with the radiation environment in a modern cardiac catheterization laboratory.

Johnson, L.W.; Moore, R.J.; Balter, S. (St. Joseph's Hospital Health Center, Syracuse, NY (United States))

1992-03-01

17

[Prescribe clean intermittent self-catheterization].  

PubMed

Clean intermittent self-catheterization is the recommended mode of voiding in patients with urinary retention. CISC is a non-sterile catheterization, done by the patient himself to insure complete emptying of the bladder several times per day. Its prescription rests on well-established recommendations with a sufficient frequency of self-catheterization (minimum 4), collected volumes less than 400 mL and a diuresis higher than 1.5 L. Clean intermittent self-catheterization allows a reduction in complications of infection, protects the upper urinary tract and provides urinary continence for the patient. Asymptomatic bacteriuria is very frequent in patients treated with intermittent catheterization and does not justify antibiotic therapy. Only symptomatic urinary tract infections have to be treated by a short course of antibiotics. Patient education and personalized medical follow-up must ensure adapted management dependant on this voiding mode and its risk factors. A guideline is provided to prescribe clean intermittent self-catheterization with its indications, its advantages and complications, its medical surveillance and treatment of urinary tract infection. This procedure should be well-known to general practitioners who are responsible for the follow up of these patients. PMID:19152777

Bonniaud, Véronique; Leroy, Joël; Kleinclauss, François; Look, Pierre-Yves; Bévalot, Julien; Parratte, Bernard

2009-03-01

18

[Reduction of puncture-induced complications after heart catheterization by optimized compression technique despite reduced compression time. A prospective, duplex ultrasound and pressure controlled study].  

PubMed

The number of local complications after heart catheterization by transfemoral approach can be lowered by optimized compression technique in spite of shortened compression time. It requires a long-term (> 30 minutes) acute compression after removing the sheaths and stable pressure during the following compression period. To achieve this issue the deployment of a novel compression device is superior to the combination of manual compression and conventional pressure dressing. A pressure of 40 to 45 mmHg is sufficient and well tolerated. Local complications as pseudoaneurysms and arteriovenous fistulas are detected by duplexsonography with high sensitivity. Only about 50 percent of pseudoaneurysms are identified by physical examination in contrast to arteriovenous fistulas which are rarely missed because of their characteristic murmur. The early ultrasound-guided compression therapy is considered to be a safe treatment of pseudoaneurysms but is not effective in arteriovenous fistulas. Risk factors of local complications are high blood pressure, multiple arterial puncture and local-anatomical conditions. Compression-related factors are short acute compression (phi 14.3 minutes) and loss of pressure during the following compression period. PMID:8984313

Sotiriou, M; von Mengden, H J; Kreusch, M

1996-09-15

19

Pancreatic sphincterotomy: Technique, indications, and complications  

PubMed Central

Pancreatic sphincterotomy serves as the cornerstone of endoscopic therapy of the pancreas. Historically, its indications have been less well-defined than those of endoscopic biliary sphincterotomy, yet it plays a definite and useful role in diseases such as chronic pancreatitis and pancreatic-type sphincter of Oddi dysfunction. In the appropriate setting, it may be used as a single therapeutic maneuver, or in conjunction with other endoscopic techniques such as pancreatic stone extraction or stent placement. The current standard of practice utilizes two different methods of performing pancreatic sphincterotomy: a pull-type sphincterotome technique without prior stent placement, and a needle-knife sphincterotome technique over an existing stent. The complications associated with pancreatic sphincterotomy are many, although acute pancreatitis appears to be the most common and the most serious of the early complications. As such, it continues to be reserved for those endoscopists who perform a relatively high-volume of therapeutic pancreaticobiliary endoscopic retrograde cholangio-pancreatography. PMID:17696223

Buscaglia, Jonathan M; Kalloo, Anthony N

2007-01-01

20

Tracheostomy: epidemiology, indications, timing, technique, and outcomes.  

PubMed

Tracheostomy is a common procedure performed in critically ill patients requiring prolonged mechanical ventilation for acute respiratory failure and for airway issues. The ideal timing (early vs late) and techniques (percutaneous dilatational, other new percutaneous techniques, open surgical) for tracheostomy have been topics of considerable debate. In this review, we address general issues regarding tracheostomy (epidemiology, indications, and outcomes) and specifically review the literature regarding appropriate timing of tracheostomy tube placement. Based on evidence from 2 recent large randomized trials, it is reasonable to wait at least 10 d to be certain that a patient has an ongoing need for mechanical ventilation before consideration of tracheostomy. Percutaneous tracheostomy with flexible bronchoscopy guidance is recommended, and optimal percutaneous techniques, indications, and contraindications and results in high-risk patients (coagulopathy, thrombocytopenia, obesity) are reviewed. Additional issues related to tracheostomy diagnosis-related groups, charges, and procedural costs are reviewed. New advances regarding tracheostomy include the use of real-time ultrasound guidance for percutaneous tracheostomy in high-risk patients. New tracheostomy tubes (tapered with low-profile cuffs that fit better on the tapered dilators, longer percutaneous tracheostomy tubes) are discussed for optimal use with percutaneous dilatational tracheostomy. Two new percutaneous techniques, a balloon inflation technique (Dolphin) and the PercuTwist procedure, are reviewed. The efficacy of tracheostomy teams and tracheostomy hospital services with standardized protocols for tracheostomy insertion and care has been associated with improved outcomes. Finally, the UK National Tracheostomy Safety Project developed standardized resources for education of both health care providers and patients, including emergency algorithms for tracheostomy incidents, and serves as an excellent educational resource in this important area. PMID:24891198

Cheung, Nora H; Napolitano, Lena M

2014-06-01

21

Sidewinder catheter for conversion of retrograde into antegrade catheterization  

SciTech Connect

Conversion of retrograde into antegrade catheterization is accomplished through the use of a sidewinder catheter with a reformed loop that is subsequently lost during advancement of the catheter tip. This technique was used to perform eight percutaneous dilatations (PTD) in seven patients (one had bilateral disease). Other applications for antegrade catheterization are considered.

Shenoy, S.S.

1983-06-01

22

Tubal catheterization and selective salpingography.  

PubMed

Hysterosalpingography with selective salpingography is by now a well-established technique in the diagnosis and therapy of some forms of female sterility especially in relation to tubal disease. The experience with a group of 302 patients with unilateral (187) or bilateral (115) proximal tubal disease, is reported. As for the catheterization of obstructed tubes, the technique was successful in about 94% of cases, while failure was observed in 6% of cases due to organic disease which hindered the transit of the angiographic guidewire or catheter. 10% of all the patients achieved spontaneous pregnancy while artificial insemination was performed in 15%. A 12-month follow-up of 10 women undergoing hysterosalpingography showed in approximately 60% of cases a new uni-or bilateral proximal tubal obstruction. No immediate or late severe procedure-associated complications were observed. Extrauterine pregnancy occurred in 2% of cases, probably due to the restored patency in tubes lacking physiologic motility. PMID:10191669

Gazzera, C; Gallo, T; Faissola, B; Zanon, E

1998-01-01

23

Techniques, indications and complications of corneal debridement.  

PubMed

The cornea is the most exposed surface of the eye and, as such, is vulnerable to external trauma and the risk of infection. Many corneal diseases alter shape, surface, and transparency and thus result in reduced vision. The external position of the cornea, however, lends itself to diagnostic and therapeutic maneuvers that are commonly performed and readily done in the clinic. More sophisticated techniques require the use of complex equipment such as excimer and femtosecond laser. Complications that develop from poor healing and/or secondary infection are best avoided with appropriate technique, antisepsis, and modification of wound healing. We review corneal debridement in the management of corneal disease. PMID:24239444

McGrath, Lindsay A; Lee, Graham A

2014-01-01

24

Indications and Techniques of Endoscope Assisted Vitrectomy  

PubMed Central

The popularization of ophthalmic endoscopy has been promoted by recent technological advancements that increase the number of indications for endoscopy. These advancements have improved the endoscope’s capabilities in its two fundamental surgical advantages: (1) bypassing anterior segment opacities, and (2) visualizing anteriorly positioned structures such as the ciliary bodies and sub-iris space. In this article, the current state of the ophthalmic endoscope is reviewed alongside its growing number of applications in glaucoma, vitreoretinal, and ocular trauma surgery. We describe the role of endoscopy in endocyclophotocoagulation for glaucoma, cyclitic membrane peeling in hypotony, retinal detachment surgery, intraocular foreign body removal, severe endophthalmitis, and pediatric traumatic vitreoretinal surgery. This review examines both the pearls and limitations of the ophthalmic application of endoscopy. In doing so, we hope to provide guidelines for using the endoscope and also to highlight applications of endoscopy that merit further study. PMID:24349675

Marra, Kyle V; Yonekawa, Yoshihiro; Papakostas, Thanos D; Arroyo, Jorge G

2013-01-01

25

Endonasal dacryocystorhinostomy: indications, technique and results.  

PubMed

Dacryocystorhinostomy (DCR) allows an obstructed lachrymal drainage system to be drained into the nasal fossa. Since the development of endonasal microsurgical techniques, the endonasal approach presents itself as an alternative choice to the conventional external approach. It is far less traumatic, yet as efficacious as the conventional approach, and avoids the need for a skin incision and the disruption of the medial canthal structures. Twenty-six patients suffering from lachrymal system obstruction underwent 28 endonasal dacryocystorhinostomies under microscopical (n = 25) or endoscopic control (n = 3). Pre-operative assessment included clinical symptoms (sac swelling, purulent secretions, epiphora) and outflow obstruction on X-rays (conventional dacryocystography and/or subtraction macrodacryocystography). Post-operatively, 23 DCR were free of symptoms. Two presented occasional epiphora and three were unsuccessful. The presence of pre-operative purulent secretions was significantly correlated with post-operative success and with lachrymal sac patency, which is also confirmed by X-ray examination (p<0.001). Thus in cases of purulent secretion with epiphora, X-ray examination is redundant and may be avoided. On the contrary, when epiphora is an isolated symptom, X-rays must be performed in order to determine where the obstruction is located and to provide information on lachrymal sac morphology. PMID:8919217

Eloy, P; Bertrand, B; Martinez, M; Hoebeke, M; Watelet, J B; Jamart, J

1995-12-01

26

Doppler-guided retrograde catheterization system  

NASA Astrophysics Data System (ADS)

The purpose of this study was to investigate a Doppler guided catheterization system as an adjunctive or alternative methodology to overcome the disadvantages of left heart catheterization and angiography. These disadvantages include the biological effects of radiation and the toxic and volume effects of iodine contrast. Doppler retrograde guidance uses a 20 MHz circular pulsed Doppler crystal incorporated into the tip of a triple lumen multipurpose catheter and is advanced retrogradely using the directional flow information provided by the Doppler waveform. The velocity detection limits are either 1 m/second or 4 m/second depending upon the instrumentation. In a physiologic flow model of the human aortic arch, multiple data points revealed a positive wave form when flow was traveling toward the catheter tip indicating proper alignment for retrograde advancement. There was a negative wave form when flow was traveling away from the catheter tip if the catheter was in a branch or bent upon itself indicating improper catheter tip position for retrograde advancement. In a series of six dogs, the catheter was able to be accurately advanced from the femoral artery to the left ventricular chamber under Doppler signal guidance without the use of x-ray. The potential applications of a Doppler guided retrograde catheterization system include decreasing time requirements and allowing safer catheter guidance in patients with atherosclerotic vascular disease and suspected aortic dissection. The Doppler system may allow left ventricular pressure monitoring in the intensive care unit without the need for x-ray and it may allow left sided contrast echocardiography. With pulse velocity detection limits of 4 m/second, this system may allow catheter direction and passage into the aortic root and left ventricle in patients with aortic stenosis. A modification of the Doppler catheter may include transponder technology which would allow precise catheter tip localization once the catheter tip is placed in the aortic root. Such technology may conceivably assist in allowing selective coronary catheterization. These studies have demonstrated that Doppler guided retrograde catheterization provides an accurate method to catheterization the aortic root and left ventricular chamber without x-ray. In humans, it may prove useful in a variety of settings including the development of invasive ultrasonic diagnostic and therapeutic technology.

Frazin, Leon J.; Vonesh, Michael J.; Chandran, Krishnan B.; Khasho, Fouad; Lanza, George M.; Talano, James V.; McPherson, David D.

1991-05-01

27

Selective salpingography and tubaric catheterization in the diagnosis and treatment of fallopian tube obstruction  

Microsoft Academic Search

Fallopian tube catheterization with selective salpingography is a new technique for the diagnosis of tubal factors of sterility and also for the treatment of proximal tubal obstruction (PTO). In this study, 156 women, 20–42 years of age, with a mean duration of infertility of 5.7 years, who presented at conventional hysterosalpingography (HSG) a unilateral or bilateral PTO, were studied. Catheterization

Eugenio Zanon; Giorgio Mallarini; Antonella Ferraiolo; Dorico Righi; Laura Lequio; Alessandra Giuliano; Paola Belforte; Giovanni Gandini

1992-01-01

28

Myocardial Perfusion Scintigraphy: Techniques, Interpretation, Indications and Reporting  

PubMed Central

Myocardial perfusion single photon emission-computed tomography (MPS) has been one of the most important and common non-invasive diagnostic cardiac test. Gated MPS provides simultaneous assessment of myocardial perfusion and function with only one study. With appropriate attention to the MPS techniques, appropriate clinical utilization and effective reporting, gated MPS will remain a useful diagnostic test for many years to come. The aim of this article is to review the basic techniques of MPS, a simplified systematic approach for study interpretation, current clinical indications and reporting. After reading this article the reader should develop an understanding of the techniques, interpretation, current clinical indications and reporting of MPS studies. PMID:22048510

Fathala, Ahmed

2011-01-01

29

Catheterization of the Hepatic Artery Via the Left Common Carotid Artery in Rats  

SciTech Connect

The commonly used approach for rat hepatic artery catheterization is via the gastroduodenal artery, which is ligated after the procedure. A new method of rat hepatic artery catheterization via the left common carotid artery (LCCA) is described. The LCCA is repaired after catheterization. The catheterization procedures included the following: (1) opening the rat's abdominal cavity and exposing the portion of abdominal aorta at the level of the celiac trunk; (2) separating and exposing the LCCA; inserting a microguidewire and microcatheter set into the LCCA via an incision; after placement into the descending aorta, the microguidewire and microcatheter are maneuvered into the hepatic artery under direct vision; (3) after transcatheter therapy, the catheter is withdrawn and the incision at the LCCA is repaired. This technique was employed on 60 male Sprague-Dawley rats with diethylnitrosamine-induced liver cancer, using a 3F microguidewire and microcatheter set. Selective hepatic artery catheterization was successfully performed in 57 rats. One rat died during the operation and five rats died within 7 days after the procedure. It is envisaged that as experience increases, the catheterization success rate will increase and the death rate will decrease. A new approach for selective hepatic artery catheterization via the LCCA in rats is introduced, which makes repeat catheterization of this artery possible and allows large embolization particles to be delivered by using a 3F catheter.

Li Xiao [West China Hospital, Sichuan University, Department of Radiology (China); Wang Yixiang, J. [AstraZeneca R and D (United Kingdom); Zhou Xiangping [West China Hospital, Sichuan University, Department of Radiology (China)], E-mail: xiangpingzhou46@163.com; Guan Yongsong; Tang Chengwei [West China Hospital, Sichuan University, Department of Gastroenterology (China)

2006-12-15

30

Spectral analysis techniques for estimating power quality indices  

Microsoft Academic Search

This paper presents the theory, design and implementation of a real time virtual instrument to measure the power quality indices such as power factor, voltage harmonic distortion and current harmonic distortion as given by the IEEE standard. Windowing techniques offer an adjustable mechanism to detect low or high power harmonics as they have different leakage characteristics. Cross spectral density is

R. Zolfaghari; Y. Shrivastava; V. G. Agelidis

2010-01-01

31

Propeller flaps: a review of indications, technique, and results.  

PubMed

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

32

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

33

[Miniinvasive surgery in spontaneous pneumothorax--indications and surgical technique].  

PubMed

The aim of the spontaneous pneumothorax management is to recover permanent inflation of the affected lung to its original extent, and to prevent air leaks. The outcomes of miniinvasive surgeries, including videothoracoscopy and videoassissted procedures, are similar to those in classical procedures, while traumatization of the tissue and the patient's stress are minimized. The study gathered information from a number of literature data and provides an up-to- date overview of the subject of the spontaneous pneumothorax miniinvasive surgery, and, in particular, a detail analysis of particular indications, contraindications, surgical techniques and the technique's prospects. Currently, videothoracoscopy is considered a method of the first choice in the spontaneous pneumothorax relapses, and, in specific indications it is also accepted to manage the first attack of the disorder. A combination of the lung and pleural procedures is considered the most reliable. Peripheral lung resection using endostaplers appears the most suitable lung management method. Considering pleurodesis procedures, mechanical methods show superior results, the optimum procedure being partial apical pleurectomy in combination with pleuroabrasion in the remaining pleural cavity. PMID:18681260

Vodicka, J; Spidlen, V

2008-06-01

34

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

35

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

36

[Labiaplasty: plastic or cosmetic surgery? Indications, techniques, results and complications].  

PubMed

Labiaplasty is the surgical term for labia minora reduction. This procedure has become popular with plastic surgery patients because physical discomfort and cosmetic concerns are virtually always combined. Demand for this procedure is becoming common amongst very young patients who appear to have nurtured a complex since their early adolescent years, disturbing their love life. There are several possible corrective surgical techniques, the postoperative courses of which vary significantly. The traditional method (longitudinal resection) remains the most widely used, but requires resection of the larger part of the labia minora, which is why in our opinion the V plasty technique seems more appropriate. The benefits, technical details, complications and postoperative course of the V plasty technique are detailed by the author in this article. PMID:19223103

Benadiba, L

2010-04-01

37

Clean Intermittent Catheterization in the School Setting  

ERIC Educational Resources Information Center

Spina bifida (SB) is a neural tube defect that causes many physical and mental disabilities. Bowel and bladder incontinence is the disability seen most often in these students that requires the school nurse's attention. Clean intermittent catheterization (CIC) provides the student with SB a vehicle to reach a satisfactory level of continence,…

Katrancha, Elizabeth D.

2008-01-01

38

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, Rogerio Eduardo Gomes; de Quadros, Alexandre Schaan; Mascia Gottschall, Carlos Antonio

2008-01-01

39

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

40

Treatment of urethral stricture disease by internal urethrotomy followed by intermittent 'low-friction' self-catheterization: preliminary communication.  

PubMed Central

The aim of this study was to determine whether the natural course of urethral stricture disease could be modified following urethrotomy by teaching patients intermittent self-catheterization. Preliminary results in 42 patients show that postoperative urine flow rates can be maintained if this method of 'low-friction' catheterization is adopted. The technique has been well received by an elderly group of patients and can be recommended for wider use. Images p138-a p138-b PMID:3357154

Lawrence, W T; MacDonagh, R P

1988-01-01

41

[Indications, technique and risks in bone marrow transplantation in adulthood].  

PubMed

The option of bone marrow transplantation (BMT) significantly improved prognosis of adult patients with hematologic malignancies aged less than 50 years. Allogeneic BMT using the marrow of an HLA-identical family member still provides the most effective method of BMT. Conventional indications for this form of BMT are chronic myeloid leukemia (CML), acute leukemias presenting with adverse risk factors, myelodysplastic syndromes and severe aplastic anemia. If performed early in the disease course (e.g. during the chronic phase of CML or first remission of acute leukemia and MDS) allogeneic BMT cures 50 to 60% of patients. About 20% die of therapy related complications, e.g. graft versus host disease (GvHD), fatal infections or venoocclusive disease of the liver (VOD) and about 20% of patients succumb to relapse of their hematologic disorder. 80% presenting with severe aplastic anemia can be cured, if allogeneic BMT is performed soon after diagnosis without previous immunosuppressive therapy and blood transfusions. BMT with the marrow of a matched unrelated donor or autologous BMT are increasingly used as alternative procedures. A rate of lethal complications as high as 50% hinders rapid extension of BMT with unrelated donors. Therefore, this form of BMT should be restricted to young patients with leukemias, who cannot achieve long-term remission with conventional chemotherapy (in case of acute leukemias) or alpha-interferon (in case of CML). Reconstitution of hematopoiesis is more rapid after peripheral blood stem cell transplantation (PBSCT) compared with autologous BMT. Therefore, PBSCT will replace autologous BMT in most cases. Most favourable results of PBSCT have been reported in patients with malignant lymphomas after relapse or inferior response to primary induction therapy. Due to the higher relapse rate autologous BMT is inferior to allogeneic BMT in leukemia patients. Trials are required to clarify the potential role of myeloablative therapy with stem cell support in the treatment of patients with solid tumors. Many of the preliminary results already published are unsatisfactory and data of larger trials are still lacking. Therefore, BMT or PBSCT cannot be recommended generally for the therapy of patients with solid tumors. PMID:8643901

Heyll, A; Söhngen, D; Minning, H; Meckenstock, G; Aul, C; Schneider, W

1996-03-19

42

Effective doses to patients from paediatric cardiac catheterization.  

PubMed

The Council Directive of the European Communities 97/43/Euratom requires dose assessment, especially for X-ray examinations of children and if high doses to the patient are involved. Both these aspects apply in cardiac catheterization and angiocardiography of children. Effective doses are a good indicator of radiation risk, particularly for leukaemia. Effective doses have been determined for 2114 infants and children undergoing cardiac catheterization from 1984 to 1996 at the University Hospital in Essen. Conversion factors (effective dose/dose-area product) were calculated based on direct dose-area product measurements for posteroanterior (PA) and lateral (Lat) projections as well as on patient records and examination details. The factors are calculated for eight age groups of children, taking into account the X-ray tube voltage for fluoroscopy and cine-film sequences, with and without zoom mode. Frequency distributions are presented for 2114 patients, for dose-area product, number of angiographic examinations (each combined with one cine-film sequence both PA and Lat) and for calculated effective doses. Highest effective doses are found in newborns (18.0 mSv and 6.5 mSv 90th and 50th percentiles, respectively) compared with adolescents of 15-21 years (8.0 mSv and 3.0 mSv 90th and 50th percentiles, respectively). Effective dose for cardiac catheterization is highest for newborns, in spite of lowest measured dose-area products, because the decreased value of the conversion factors overcompensates for the increase of dose-area product with age. This is especially important because of the higher tumour risk for equal effective dose for young children compared with adults. PMID:10884731

Rassow, J; Schmaltz, A A; Hentrich, F; Streffer, C

2000-02-01

43

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

44

Percutaneous Extraluminal (Subintimal) Recanalization of a Brachial Artery Occlusion Following Cardiac Catheterization  

SciTech Connect

A 47-year-old woman presented with disabling right arm claudication 10 weeks after Sones cardiac catheterization via a brachial artery cut-down. A technique of extraluminal recanalization of the brachial artery occlusion, used to treat this patient, is described.

Bolia, Amman [Department of Radiology, Clinical Sciences Building, Leicester Royal Infirmary, PO Box 65, Leicester LE2 7LX (United Kingdom); Nasim, Akhtar; Bell, Peter R.F. [Department of Surgery, Clinical Sciences Building, Leicester Royal Infirmary, PO Box 65, Leicester LE2 7LX (United Kingdom)

1996-05-15

45

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

46

Iatrogenic vertebral artery pseudoaneurysm due to central venous catheterization  

PubMed Central

Central venous lines have become an integral part of patient care, but they are not without complications. Vertebral artery pseudoaneurysm formation is one of the rarer complications of central line placement. Presented is a rare case of two pseudoaneurysms of the vertebral and subclavian artery after an attempted internal jugular vein catheterization. These were successfully treated with open surgical repair and bypass. Open surgical repair remains the gold standard of treatment. Endovascular repair of vertebral artery pseudoaneurysms has been described with promising outcomes, but long-term results are lacking. Ultimately, the best treatment of these iatrogenic injuries should start with prevention. Well-documented techniques to minimize mechanical complications, including inadvertent arterial puncture, should be practiced and taught in training programs to avoid the potentially devastating consequences. PMID:21566753

Vasquez, Jay

2011-01-01

47

SCAI expert consensus statement for advanced training programs in pediatric and congenital interventional cardiac catheterization.  

PubMed

Pediatric and Congenital Interventional Cardiology is the practice of catheter-based techniques that improve cardiac physiology and circulation through the treatment of heart disease in children and adults with congenital or acquired heart defects. Over the last decade, and since last published training guidelines for pediatric cardiac catheterization and interventional cardiology were published in 2005 [1] the field of Pediatric and Congenital Cardiac Catheterization has evolved into a predominantly interventional discipline. As there is no sub-specialty certification for interventional cardiac catheterization in pediatrics, the Congenital Heart Disease Committee of the Society of Cardiovascular Angiography and Interventions has put together this consensus statement for advanced training in pediatric and congenital interventional cardiac catheterization. The statement puts forth recommendations for program infrastructure in terms of teaching, personnel, equipment, facilities, conferences, patient volume and trainee assessment. This is meant to set a standard for training programs as well as giving applicants a basis on which to judge and compare programs. © 2014 Wiley Periodicals, Inc. PMID:24890705

Armsby, Laurie; Beekman, Robert H; Benson, Lee; Fagan, Thomas; Hagler, Donald J; Hijazi, Ziyad M; Holzer, Ralf; Ing, Frank; Kreutzer, Jacqueline; Lang, Peter; Levi, Daniel S; Latson, Larry; Moore, Phillip; Mullins, Charles; Ruiz, Carlos; Vincent, Robert

2014-11-01

48

The use of biofeedback in a behavioral program designed to teach an anxious child self-catheterization.  

PubMed

This paper presents a case study of a 7-year-old girl with a noncompliant bladder who was trained to self-catheterize using biofeedback and behavior therapy techniques. Initial attempts to train her to self-catheterize were unsuccessful owing to excessive amounts of fear, muscle tension, and refusal. After seven treatment sessions in which she was instructed in proper self-catheterization technique by a urology nurse clinician and coached in biofeedback-assisted relaxation by a clinical psychologist, the child successfully learned to self-catheterize. EMG readings showed a decrease in quadriceps muscle tension levels across sessions. Eight additional sessions were held in order to train the child's parents in proper technique and coaching procedures. Through the use of portable biofeedback equipment during actual training sessions, the biofeedback served as a cue--first to the child and coach, and later to the child and parents--for when the child needed to stop and relax. This case illustrates the usefulness of biofeedback in a comprehensive behavioral program designed to teach self-catheterization to fearful children. PMID:2907861

Gil, K M; Perry, G; King, L R

1988-12-01

49

Prognostic Value of Left Ventricular Diastolic Dysfunction in Patients Undergoing Cardiac Catheterization for Coronary Artery Disease  

PubMed Central

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

50

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

51

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

52

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.

Greenlund, Andrew C.

2014-01-01

53

The learning curve of selective salpingography and tubal catheterization  

Microsoft Academic Search

Objective: To determine the effect of increasing experience in fluoroscopically guided selective salpingography and tubal catheterization on radiation doses and screening times, thus establishing a learning curve for the procedure.Design: Retrospective case note analysis.Setting: IVF center of an academic teaching hospital .Patients: Three hundred sixty-six patients with infertility seen over 3.5 years.Intervention(s): Fluoroscopically guided selective salpingography and tubal catheterization.Main Outcome

Spyros Papaioannou; Masood Afnan; Alan J Girling; Bolarinde Ola; Nehed Hammadieh; Aravinthan Coomarasamy; Kaldoun Sharif

2002-01-01

54

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

55

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

56

Spectral analysis techniques with Kalman filtering for estimating power quality indices  

Microsoft Academic Search

This paper presents the theory, design and implementation of two real time virtual instruments to measure the power quality indices such as current harmonic distortion, voltage harmonic distortion and power factor as given by the IEEE standard. Different windowing techniques are explored in the estimation of the spectra. Cross spectral analysis is used for the measurement of phase angles in

R. Zolfaghari; Y. Shrivastava; V. G. Agelidis; G. M. L. Chu

2010-01-01

57

An Unusual Cause of Cardiac Tamponade during Cardiac Catheterization Study  

PubMed Central

Introduction. Catheter-based diagnostic and therapeutic procedures are rapidly advancing. However, catheter related complications sometimes become life threatening. Cardiac tamponade is a rare but serious complication of this procedure. We have summarized one cardiac tamponade pejoration due to secondary coronary vessels laceration by the implanted pericardial drainage. Case report. A 4-year-old baby having Tetralogy of Fallot was posted for diagnostic catheterization study. Patient was induced with sevoflurane and spontaneous respiration was maintained. After catheter insertion to RV, dye was injected through the catheter which rapidly spread into the pericardial cavity indicating right ventricle perforation. Immediately, blood was aspirated under transthoracic echocardiographic guidance and hemodynamics started improving. For the provision of quick access to aspirate further collection, an intrapericardial sheath was inserted after multiple attempts. Patient's condition started deteriorating again. TTE revealed again some collection and it was increasing gradually. On exploration, it was found that there was continuous bleeding from a lacerated epicardial vessel which contributed to the pericardial collection leading to further tamponade effect. This second iatrogenic injury complicated the management of the first iatrogenic cardiac perforation and, thereby, created a life-threatening situation which needed immediate surgical exploration. Discussion. Usual cause of tamponade after right ventricular perforation is bleeding from the RV, but in our case the second tamponade was not due to bleeding from the RV, but was rather from new laceration injury of epicardial vessels which was remained undiagnosed till exploration.

Das, Deepanwita; Datta, Monalisa; Dey, Somnath; Parida, Jyotiranjan; Kumar, Rupesh; Pande, Arindam

2014-01-01

58

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

59

Cardiac catheterization and intervention in haemophilia patients: prospective evaluation of the 2009 institutional guideline.  

PubMed

Ageing haemophilia patients are increasingly confronted with ischaemic heart disease (IHD). Treatment is complex because of the delicate equilibrium between bleeding and thrombosis. In 2009, we developed an institutional guideline on how to treat IHD in this patient population. The aim of this study was to evaluate feasibility and safety of this guideline. Haemophilia patients who underwent coronary angiography or percutaneous coronary intervention between January 2009 and June 2012 were included in the current case series. Nine diagnostic or therapeutic cardiac catheterizations were performed in six haemophilia patients. One patient with moderate haemophilia B was included, whereas the other patients had mild haemophilia A. In six of nine procedures, access to the circulation was gained via the radial artery. Only bare-metal stents were implanted, after which dual antiplatelet treatment was given for at least 4 weeks. During cardiac catheterization/intervention and dual antiplatelet treatment, clotting factor levels were corrected. No thrombotic or clinically relevant bleeding complications occurred. In one patient, a low-titre inhibitor recurred 10 months after catheterization. In-stent restenosis was diagnosed in one patient. This case series indicates that treatment according to the guideline is feasible and safe. Furthermore, based on the case series and developments in new guidelines for non-haemophilic patients with IHD, some adjustments on the 2009 guideline are proposed. PMID:23496171

Tuinenburg, A; Damen, S A J; Ypma, P F; Mauser-Bunschoten, E P; Voskuil, M; Schutgens, R E G

2013-05-01

60

Corneal Transplantation at an Ophthalmological Referral Center in Colombia: Indications and Techniques (2004-2011)  

PubMed Central

Purpose: To analize changing trends in indications and surgical techniques of corneal transplantation at an ophthalmological tertiary referral center in Colombia over a 7 year period. Methods: A retrospective analysis was performed of medical records from patients who underwent corneal transplantation surgeries at Fundación Oftalmológica de Santander (FOSCAL) in Bucaramanga, Colombia, between August 2004 and August 2011. Results: During this period from a total of 450 corneal transplants performed, we had access to 402 medical records (89.4%). The patients’ mean age was 55. Leading indications were: pseudophakic/aphakic bullous kerathopathy (PBK/ABK) (34.6%), corneal scar (15.7%), active infectious keratitis (14.4%) and keratoconus (12.7%). During the first period (2004-2007) PBK/ABK was the leading indication, followed by stromal opacities and keratoconus. During the second period (2008-2011) PBK/ABK remained the leading indication. Infectious keratitis, however, became the second most common indication. Stromal opacities and keratoconus, moved to third and fourth, respectively. All transplants performed in the first period (2004-2007) were penetrating keratoplasties. In the second period (2008-2011) 18.7% of the procedures were performed using the Descemet’s stripping automated endothelial keratoplasty technique (DSAEK). Conclusions: Similar to other international results, PBK/ABK was the leading indication for corneal transplantation at our institution. Keratoconus is becoming a less common indication for keratoplasty in our institution. Infectious keratitis remains a frequent indication for corneal transplantation in this geographical area. In our institution we started performing DSAEK in 2009, and it is emerging as the procedure of choice in corneal diseases that involve only the endothelial layers. PMID:23898357

Galvis, Virgilio; Tello, Alejandro; Gomez, Augusto José; Rangel, Carlos Mario; Prada, Angélica María; Camacho, Paul Anthony

2013-01-01

61

Post-cardiac catheterization access site complications and low-molecular -weight heparin following cardiac catheterization.  

PubMed

The low molecular weight heparin enoxaparin is often administered to patients on long-term anticoagulation regimens who temporarily discontinue warfarin prior to undergoing invasive procedures. The clinical outcome of all enoxaparin-treated patients who underwent cardiac catheterization or coronary artery interventional procedures (n = 119) was evaluated. A total of 5 patients (4.2%) requiring anticoagulation (3 with chronic atrial fibrillation and 2 with ventricular thrombi) developed severe late enoxaparin-associated hemorrhagic or vascular complications at the femoral arterial puncture site between 3 and 11 days post-procedure. Complications included development of femoral arterial pseudoaneurysm (n = 3), hypotension (systolic blood pressure < 90 mmHg) (n = 2), acute decrease in hemoglobin levels to < 8.5 mg/dl (n = 4) and cardiac arrest (n = 1). In patients receiving standard dose enoxaparin after percutaneous invasive cardiac procedures, there is the potential for delayed and severe access site hemorrhagic and vascular complications. PMID:12556615

MacDonald, Lee A; Meyers, Sheridan; Bennett, Charles L; Fintel, Dan; Grosshans, Neal; Syegco, Raffy; Davidson, Charles J

2003-02-01

62

Reevaluation of the protein requirement in young men with the indicator amino acid oxidation technique13  

Microsoft Academic Search

Background:Thecurrentestimatedproteinrequirementsarebased on the nitrogen balance method, which has many limitations. An alternate approach is needed to permit a reevaluation of protein requirements. Objective: The objective was to determine protein requirements in men by using the indicator amino acid oxidation technique. Design: Eight healthy men randomly received graded protein in- takes (0.10, 0.30, 0.60, 0.90, 1.2, 1.5 and 1.8 g kg1

Mohammad A Humayun; Rajavel Elango; Ronald O Ball; Paul B Pencharz

63

Instillagel: an anaesthetic antiseptic gel for use in catheterization.  

PubMed

Instillagel is a prefilled syringe containing lignocaine 2% and chlorhexidine 0.25% in a sterile lubricant gel. It is available in two sizes, 11 ml and 6 ml, for male and female catheterization respectively, and for intermittent self-catheterization. It has been used successfully for these purposes for many years, and its usage in the community setting is increasing. It is used for surface anaesthesia by many UK urologists. It is easily applied by both nurse and patient and remains the product of choice when performing indwelling catheterization. It also has an important role in stricture therapy where patients require extra lubrication for the passage of a catheter or an anaesthetic effect to provide patient comfort following the procedure. Instillagel has the added benefit of an antibacterial effect due to its chlorhexidine content. PMID:10214141

Doherty, W

64

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

65

FEATURES OF UMBILICAL VAS CULAR CATHETERIZATION IN THE NEWBORN  

Microsoft Academic Search

tion for neonatal exchange blood transfu- sions. During the subsequent years, um- bilical vascular catheterization has become a valuable procedure in the management not only of hemolytic disease in the new- born but also of respiratory distress, hypo- glycemia, and idiopathic hyperbilirubin- emia in the newborn. As the management of severely ill newborns has become more aggressive, sequential monitoring of

ROBERT E. CAMPBELL

66

Measurement of phloem transport rates by an indicator-dilution technique. [Triticum aestivum L  

SciTech Connect

An indicator-dilution technique for the measurement of flow rates, commonly used by animal physiologists for circulation measurements, was adapted to the measurement of phloem translocation rates in the wheat (Triticum aestivum L.) peduncle. The approach is based on the observation that, during the transport of a given amount of solute, its mean concentration will be inversely proportional to flow rate. For phloem transport in the wheat peduncle, the necessary measurements are (a) the time course of tracer kinetics in the peduncle phloem, (b)the volume of sieve tubes and companion cells in the monitored segment of the peduncle, and (c) the amount of tracer transported past that point. The method was evaluated by in situ monitoring of {sup 32}PO{sub 4} transport in pulse-labeling experiments. Specific activities (i.e. {sup 32}P concentrations) of phloem exudate were in good agreement with those calculated from in situ count rates and measured phloem areas. Mass transport rates, calculated from volume flow rates and phloem exudate dry matter content, also agreed well with expected mass transport rates based on measurements of grain growth rate and net CO{sub 2} exchange by the ear. The indicator-dilution technique appears to offer good precision and accuracy for short-term measurements of phloem transport rates in the wheat peduncle and should be useful for other systems as well.

Fisher, D.B. (Washington State Univ., Pullman (USA))

1990-10-01

67

TG13 indications and techniques for gallbladder drainage in acute cholecystitis (with videos).  

PubMed

Percutaneous transhepatic gallbladder drainage (PTGBD) is considered a safe alternative to early cholecystectomy, especially in surgically high-risk patients with acute cholecystitis. Although randomized prospective controlled trials are lacking, data from most retrospective studies demonstrate that PTGBD is the most common gallbladder drainage method. There are several alternatives to PTGBD. Percutaneous transhepatic gallbladder aspiration is a simple alternative drainage method with fewer complications; however, its clinical usefulness has been shown only by case-series studies. Endoscopic naso-gallbladder drainage and gallbladder stenting via a transpapillary endoscopic approach are also alternative methods in acute cholecystitis, but both of them have technical difficulties resulting in lower success rates than that of PTGBD. Recently, endoscopic ultrasonography-guided transmural gallbladder drainage has been reported as a special technique for gallbladder drainage. However, it is not yet an established technique. Therefore, it should be performed in high-volume institutes by skilled endoscopists. Further prospective evaluations of the feasibility, safety, and efficacy of these various approaches are needed. This article describes indications and techniques of drainage for acute cholecystitis.Free full-text articles and a mobile application of TG13 are available via http://www.jshbps.jp/en/guideline/tg13.html. PMID:23307009

Tsuyuguchi, Toshio; Itoi, Takao; Takada, Tadahiro; Strasberg, Steven M; Pitt, Henry A; Kim, Myung-Hwan; Supe, Avinash N; Mayumi, Toshihiko; Yoshida, Masahiro; Miura, Fumihiko; Gomi, Harumi; Kimura, Yasutoshi; Higuchi, Ryota; Okamoto, Kohji; Yamashita, Yuichi; Gabata, Toshifumi; Hata, Jiro; Kusachi, Shinya

2013-01-01

68

Comparison of Topical Anesthetics and Lubricants Prior to Urethral Catheterization in Males: A Randomized Controlled Trial  

Microsoft Academic Search

Although male urethral catheterization in the emergency department (ED) is both common and painful, few studies have evaluated the use of topical anesthesia prior to catheterization. Objectives: To determine whether pretreat- ment of the urethra with topical lidocaine reduces the pain associated with urethral catheterization. Methods: This was a prospective, double-blind, randomized clinical trial of 36 alert, cooperative male adult

John Siderias; Flavio Guadio; Adam J. Singer

2004-01-01

69

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

70

Changes in Selected Biochemical Indices Resulting from Various Pre-sampling Handling Techniques in Broilers  

PubMed Central

Background Since it is not yet clear whether it is possible to satisfactorily avoid sampling-induced stress interference in poultry, more studies on the pattern of physiological response and detailed quantification of stress connected with the first few minutes of capture and pre-sampling handling in poultry are required. This study focused on detection of changes in the corticosterone level and concentrations of other selected biochemical parameters in broilers handled in two different manners during blood sampling (involving catching, carrying, restraint, and blood collection itself) that lasted for various time periods within the interval 30-180 seconds. Methods Stress effects of pre-sampling handling were studied in a group (n = 144) of unsexed ROSS 308 broiler chickens aged 42 d. Handling (catching, carrying, restraint, and blood sampling itself) was carried out in a gentle (caught, held and carried carefully in an upright position) or rough (caught by the leg, held and carried with lack of care in inverted position) manner and lasted for 30 s, 60 s, 90 s, 120 s, 150 s, and 180 s. Plasma corticosterone, albumin, glucose, cholesterol, lactate, triglycerides and total protein were measured in order to assess the stress-induced changes to these biochemical indices following handling in the first few minutes of capture. Results Pre-sampling handling in a rough manner resulted in considerably higher plasma concentrations of all biochemical indices monitored when compared with gentle handling. Concentrations of plasma corticosterone after 150 and 180 s of handling were considerably higher (P < 0.01) than concentrations after 30-120 s of handling regardless of handling technique. Concentrations of plasma lactate were also increased by prolonged handling duration. Handling for 90-180 seconds resulted in a highly significant elevation of lactate concentration in comparison with 30 s handling regardless of handling technique. Similarly to corticosterone concentrations, a strong positive correlation was found between plasma lactate and duration of pre-sampling handling. Other biochemical indices monitored did not show any correlation pattern in connection with duration of pre-sampling handling. Conclusions These results indicate that the pre-sampling procedure may be a considerably stressful procedure for broilers, particularly when carried out with lack of care and exceeding 120 seconds. PMID:21569531

2011-01-01

71

Automated interferometric technique for express analysis of the refractive indices in isotropic and anisotropic optical materials  

NASA Astrophysics Data System (ADS)

This paper deals with the technique for the refractive index measurements based on the interferometry of a rotated parallel plate (IRPP). The device consists of the Michelson interferometer, the sample rotation system and the optoelectronic registration system. A refractive index of parallel plates is determined by their rotation through measuring simultaneously a shift of interference fringes. Although the IRPP technique is known from long ago [Shumate MS. Appl Opt 1966;5:327] several considerable improvements have been done in order to improve the accuracy of the method. The measuring process is completely automated. The method has been tested on the model crystals of the lithium niobate giving the magnitudes for ordinary and extraordinary refractive indices as n0=2.2865±0.0007 and ne=2.2034±0.0007. A considerable increase of accuracy is reached in our case by an automation of the measuring procedure, development of a new software as well as implementing the interferometric method for a precise determination of a sample zero position. The automated refractometer is offered for use in research laboratories and industry.

Andrushchak, A. S.; Tybinka, B. V.; Ostrovskij, I. P.; Schranz, W.; Kityk, A. V.

2008-02-01

72

What is the Clinical Utility of Routine Cardiac Catheterization Before a Fontan Operation?  

PubMed Central

Patients with single-ventricle circulation presenting for Fontan completion routinely undergo cardiac catheterization despite ongoing debate concerning its additive value. Increasing interest in noninvasive preoperative evaluation alone led the authors to analyze the utility of routine pre-Fontan catheterization and to determine whether a subset of patients could avoid this invasive procedure. Patients younger than 5 years referred for pre-Fontan evaluation were retrospectively reviewed. Medical records and catheter angiograms were examined, and catheterizations were categorized as “additive” based on predetermined criteria. Associations between precatheterization variables, catheterization findings, and short-term postoperative outcomes were evaluated. Cardiac catheterization was clinically nonadditive for 89 of 175 patients undergoing pre-Fontan evaluation (51%). There were no robust precatheterization predictors of a nonadditive catheterization. Echocardiography did not fully demonstrate the relevant anatomy of 115 patients (66%), most frequently due to inadequate visualization of the pulmonary arteries, and 22 patients had additive catheterizations due to new diagnostic findings alone. Interventions at catheterization were frequent and deemed “important” for 64 patients (37%). Catheterization hemodynamic data were not associated with early postoperative outcomes. Minor catheterization complications occurred for 51 patients (29%) and major complications for 4 patients (2%). Although at least 50% of the patients presenting for Fontan completion may be able to avoid routine catheterization safely, an echocardiography-based imaging strategy alone is insufficient to allow proper identification of those who could be evaluated noninvasively. A more comprehensive imaging strategy not based solely on echocardiography should be considered. PMID:20503042

Banka, Puja; McElhinney, Doff B.; Bacha, Emile A.; Mayer, John E.; Gauvreau, Kimberlee; Geva, Tal; Brown, David W.

2014-01-01

73

Medicolegal characteristics of cardiac catheterization litigation in the United States, 1985 to 2009.  

PubMed

There are few assessments of patterns of medicolegal cases involving cardiac catheterizations. This descriptive study reviews the patterns of liability and medical outcomes involving cardiac catheterization litigation from the LexisNexis Academic database and the Physician Insurers Association of America registry. From 1985 to 2009, the Physician Insurers Association of America registry documented 1,361 closed coronary angiography claims. The cardiovascular disease specialty was involved in 699 with other specialties involved in the remaining cases. Of the 1,361 closed claims, 301 (22%) resulted in payments to the plaintiff (average indemnity of $230,987). The most common alleged error was for improper performance (35.4%; average indemnity of $255,542). The alleged error with the highest average indemnity of $270,916 was errors in diagnosis. Not performing an indicated procedure had the highest ratio of paid to closed claims (41%) with an average indemnity of $246,988. In regard to the severity of injury, death was the most common outcome (44%). The highest ratio of paid to total closed claims (43%) was for grave injuries (highest average indemnity of $555,625). Of the 116 LexisNexis cases, litigation against physicians occurred in 90.5% of cases with judgments in favor of the patients in 29.5%. When death was the outcome (31% of cases), physicians were highly likely to be sued (97%) and the judgment was more likely in the plaintiffs' favor (44%). In conclusion, in litigation related to cardiac catheterizations, most cases are due to medical malpractice and physicians are sued in a high percentage of cases. Cardiologists should recognize these patterns of litigation as these may impact and improve processes of care. PMID:24012022

Kim, Candice; Vidovich, Mladen I

2013-11-15

74

[Methods of resolution for haptic assistance during catheterization].  

PubMed

During catheterization navigation within the patient is mainly dependent on a live x-ray image on the screen. Although methods for 3D visualisation and remote navigation of the catheter are discussed and tested still precise positioning is merely the result of intense training and a high skill and level of training of the performing surgeon. This article refers to a system which can be considered as an add-on for existing procedures of catheterization. It compromises of a miniaturised force sensor located at the tip of guide-wires whose prototype is shown here. The measured forces will be presented to the surgeon amplified by an external actuator described in this article. As a result a haptic perception of the forces between the tip of the guide-wire and the vessels walls will be available and enable the surgeon to gain an impression which is comparable to palpation of living vessels from the inside PMID:15792195

Kern, T A; Herrmann, J; Klages, S; Meiss, T; Werthschützky, R

2005-01-01

75

Urethrovaginal fistula: a rare complication of transurethral catheterization.  

PubMed

In the developed world, urethrovaginal fistulas are most often observed after urethral diverticulum repair attempts, anterior repairs, or sling procedures. Obstetrical causes are exceptionally rare. In this case of urethrovaginal fistula, the cause was urethral trauma during routine transurethral catheterization, which was most likely caused by the inappropriate placement or displacement of a Foley catheter balloon during normal delivery. We discuss the presentation, diagnosis, and surgical management. PMID:25181381

A L Dakhil, Lateefa O

2014-01-01

76

Oxygen consumption in infants and children during heart catheterization  

Microsoft Academic Search

Oxygen consumption was measured in infants, children, and adolescents during diagnostic heart catheterizations. A total of\\u000a 825 measurements of oxygen consumption (VO2) was performed in 504 subjects using a semiopen hood system and a paramagnetic oxygen analyzer. In 256 subjects under 3 years\\u000a of age, body dimensions and heart rate were found to be significant factors for oxygen consumption. The

B. P. W. Lundell; M. L. Casas; C. G. Wallgren

1996-01-01

77

Duplex scans before subclavian vein catheterization predict unsuccessful catheter placement.  

PubMed

Subclavian catheterization in patients with cancer is associated with up to a 38% incidence of subclavian vein thrombosis. These thrombi seldom recanalize. The persistent occlusion of the subclavian vein may hinder subsequent catheter placement. To determine the frequency of this occurrence and to determine if preoperative duplex scanning could identify these individuals, we performed preoperative duplex scanning in 22 patients who had previously had an indwelling subclavian catheter for chemotherapy. Subsequent subclavian vein catheterization was attempted without knowledge of the results of the duplex scan. Nineteen scans were normal. Of these, 18 patients underwent successful catheter placement. In one patient, catheterization was unsuccessful and an intraoperative venogram showed a focal obstruction of the proximal portion of the subclavian vein. Three scans showed noncompressibility of the vein, and catheter placement was unsuccessful in these three veins. In patients who have had previous subclavian catheters, persistent obstruction of the vein prevents subsequent catheter placement in 14%. Duplex scanning before subsequent catheter placement generally identifies these individuals. PMID:1540103

Haire, W D; Lynch, T G; Lieberman, R P; Edney, J A

1992-02-01

78

Management of urethral stricture in patients practising clean intermittent catheterization.  

PubMed

Clean intermittent catheterization (CIC) is used commonly to treat patients with impaired bladder emptying. We treated 6 male patients who were experiencing difficulty with intermittent catheterization. Retrograde urethrography demonstrated stricture of the urethra in all of them and a false passage as well in one patient. Treatment consisted of urethral dilatation using filiform and followers in 4 patients and optical internal urethrotomy in the remaining 2 patients followed by urethral stenting using a 16 Fr. Teflon Foley catheter in all. The stenting Foley catheter was removed after 2 weeks. Subsequently 5 of the 6 patients had resumed CIC regimen to empty their urinary bladder. The sixth patient with a false passage could not perform CIC and suprapubic cystostomy was performed. During a follow-up of 6 of 18 months, none of these five patients developed recurrence of urethral stricture and all are practising CIC without any difficulty. Analysis of our data revealed that forceful manipulation during catheter insertion and significant urethral bleeding during catheterization are important contributory factors for the development of urethral stricture in patients practising CIC. PMID:8276568

Mandal, A K; Vaidyanathan, S

1993-01-01

79

Ultrasound-guided botulinum toxin injections in neurology: technique, indications and future perspectives.  

PubMed

Botulinum toxin (BT) therapy is used in neurology to treat muscle hyperactivity disorders including dystonia, spasticity, cerebral palsy, hemifacial spasms and re-innervation synkinesias as well as exocrine gland hyperactivity disorders. To increase its therapeutic effect and to decrease adverse effects in adjacent tissues, exact BT placement is important. Ultrasonography (US) allows non-invasive, real-time imaging of muscular and glandular tissues and their surrounding structures. It can visualize, guide, and standardize the entire procedure of BT application. Small randomized studies suggest that US-guidance can improve therapeutic efficacy and reduce adverse effects of BT therapy when compared to conventional placement. US-guidance should be used in forearm muscles when functionality is important, and in selected leg muscles. It may be used for targeting distinct neck muscles in cervical dystonia. It is helpful for targeting the salivary glands. Here we review the technique, indications and future developments of US-guidance for BT injection in neurological disorders. PMID:25046267

Walter, Uwe; Dressler, Dirk

2014-08-01

80

Fat grafting versus adipose-derived stem cell therapy: distinguishing indications, techniques, and outcomes.  

PubMed

With adipose-derived stem cells (ASCs) at the forefront of research and potential clinical applications, it is important that clinicians be able to distinguish them from the fat grafting currently used clinically and to understand how the two approaches relate to one another. At times, there has been confusion in clinically considering the two therapies to be the same. This report is aimed at distinguishing clearly between fat grafting and ASC therapy with regard to the indications, harvesting, processing, application techniques, outcomes, and complications. Findings have shown that autologous fat transfer, a widely used procedure for soft tissue augmentation, is beneficial for reconstructive and cosmetic procedures used to treat patients with volume loss due to disease, trauma, congenital defects, or the natural process of aging. On the other hand, ASCs have been identified as an ideal source of cells for regenerative medicine, with the potential to serve as soft tissue therapy for irradiated, scarred, or chronic wounds. Recent advances in tissue engineering suggest that the supplementation of fat grafts with ASCs isolated in the stromal vascular fraction may increase the longevity and quality of the fat graft. Research suggests that ASC supplementation may be a great clinical tool in the future, but more data should be acquired before clinical applications. PMID:22069062

Tabit, Christina J; Slack, Ginger C; Fan, Kenneth; Wan, Derrick C; Bradley, James P

2012-06-01

81

Ultrasound-guided vascular catheterization in loggerhead sea turtles (Caretta caretta).  

PubMed

In this study, the authors describe a simple, nontraumatic procedure for ultrasound-guided placement and maintenance ofjugular and cephalic vein catheterization. The ultrasound scans were performed with a GE Logiq 400 machine connected to a multifrequency (7-11 MHz) linear-array transducer. To find the cephalic vein, longitudinal and transverse color-Doppler ultrasonographic scans were made of the dorsal surface of the flipper. To find the jugular vein, scans of the midline of the lateral surface of the neck were performed. Once the vein had been located, a 16- to 22-gauge 51-mm needle catheter was inserted into the skin beneath the ultrasound probe, inclined at 15-25 degrees to the skin surface. The successful insertion of the catheter inside the vein was monitored by ultrasound. The authors believe that the procedure described offers a good option for fashioning a simple, nontraumatic, and durable vascular access in sea turtles compared with previously described techniques. Caretta caretta, cephalic vein, jugular vein, ultrasonography, vascular catheterization. PMID:20945652

Di Bello, Antonio; Valastro, Carmela; Freggi, Daniela; Saponaro, Vittorio; Grimaldi, Domenico

2010-09-01

82

[Tubal catheterization with selective salpingography in the diagnosis and therapy of fallopian tube obstruction].  

PubMed

Fallopian tube catheterization with selective ostial [correction of osteal] salpingography is a new technique for the diagnosis of tubal factors of infertility and also for the treatment of proximal tubal occlusion (PTO). In this study, 246 women were considered, 20-42 years old, with primary or secondary infertility, who presented a unilateral or bilateral PTO at hysterosalpingography (HSG). Catheterization and selective salpingography have been successful in 93.9% of the cases. Failures (5.6%) have been ascribed to obstructive organic diseases, where it was impossible to overcome the stenosis with the catheter or the guide-wire. Twenty-six spontaneous pregnancies were obtained (15 full-term deliveries) and 17 patients became pregnant after GIFT (13 full-term deliveries). At follow-up, after 12 months 4 of 10 patients had normal tubes, while 6 patients presented a new unilateral or bilateral PTO. No major complications occurred; nevertheless, ectopic pregnancy is a possible event, because of the mechanically re-established patency in a nonfunctioning tube. PMID:1604001

Mallarini, G; Zanon, E; Ferraiolo, A; Righi, D; Giuliano, A; Fonio, P; Gandini, G

1992-04-01

83

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

84

Suprapubic bladder catheterization of male spinal-cord-injured Sprague-Dawley rats.  

PubMed

The rat spinal-cord-injury (SCI) model is widely used to study the pathologic mechanisms that contribute to sensory and motor dysfunction in humans. This model is thought to mimic many of the negative outcomes experienced by humans after spinal contusion injury. We theorized that manual bladder expression contributed to the kidney and bladder lesions reported in previous studies using the rat SCI model. In the present study, rats were surgically implanted with bladder catheters after spinal contusion injury to provide continuous drainage of urine. After 72 h, the rats were euthanized and their kidneys and bladders examined histologically. BUN, serum creatinine, and urine protein were compared at 0 and 72 h after surgery. Kidney and bladder lesions were similar in SCI rats with and without implanted bladder catheters. BUN at 72 h was higher than baseline values in both groups, whereas serum creatinine was higher at 72 h compared with baseline values only in the catheterized rats. These findings indicate that suprapubic bladder catheterization does not reduce hydronephrosis in SCI rats and that the standard of care for bladder evacuation should continue to be manual expression of urine. PMID:22330872

Robinson, Mary A; Herron, Alan J; Goodwin, Bradford S; Grill, Raymond J

2012-01-01

85

Suprapubic Bladder Catheterization of Male Spinal-Cord–Injured Sprague–Dawley Rats  

PubMed Central

The rat spinal-cord–injury (SCI) model is widely used to study the pathologic mechanisms that contribute to sensory and motor dysfunction in humans. This model is thought to mimic many of the negative outcomes experienced by humans after spinal contusion injury. We theorized that manual bladder expression contributed to the kidney and bladder lesions reported in previous studies using the rat SCI model. In the present study, rats were surgically implanted with bladder catheters after spinal contusion injury to provide continuous drainage of urine. After 72 h, the rats were euthanized and their kidneys and bladders examined histologically. BUN, serum creatinine, and urine protein were compared at 0 and 72 h after surgery. Kidney and bladder lesions were similar in SCI rats with and without implanted bladder catheters. BUN at 72 h was higher than baseline values in both groups, whereas serum creatinine was higher at 72 h compared with baseline values only in the catheterized rats. These findings indicate that suprapubic bladder catheterization does not reduce hydronephrosis in SCI rats and that the standard of care for bladder evacuation should continue to be manual expression of urine. PMID:22330872

Robinson, Mary A; Herron, Alan J; Goodwin, Bradford S; Grill, Raymond J

2012-01-01

86

Thyrocervical artery - jugular fistula following internal jugular venous catheterization  

PubMed Central

Arteriovenous fistula (AVF) is an anomalous communication between an artery and a vein, caused by an iatrogenic or traumatic etiology. Surgically created upper limb AVF remains the preferred vascular access for patients on maintenance hemodialysis. Nonetheless central vein cannulation for hemodialysis is a common procedure done in patients who need hemodialysis. We incidentally detected a thyrocervical artery - jugular fistula in a patient on maintenance hemodialysis. He underwent a successful intra arterial coil embolization of the feeding vessel. Review of literature has shown that, a thyrocervical artery - internal jugular vein arteriovenous fistula following a central venous catheterization has not been reported so far. PMID:25120297

Zachariah, P. P.; Unni, V. N.; Kurian, G.; Nair, R. R.; Mathew, A.

2014-01-01

87

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

88

La r?paration sphinct?rienne directe: points techniques, indications et r?sultats  

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

89

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

90

Focal seizure and cerebral contrast retention after cardiac catheterization.  

PubMed

Although rare, ionic and nonionic contrast-induced seizures occur as a complication of enhanced cranial computed tomography for both adults and children. However, contrast-induced seizures after cardiac catheterization has only been reported in adults. This report describes an 18-month-old male who developed a new-onset focal seizure 12 hours after cardiac catheterization. Unenhanced cranial computed tomography 1 hour after the seizure demonstrated general cerebral edema and unilateral focal cerebral contrast retention with sparing of the area supplied by the middle cerebral artery. The contrast was reabsorbed from the subarachnoid space over a 48-hour period, the cerebral edema resolved over several days, and the child returned to his baseline state 4 days after the seizure episode. This study documents the evolution of computed tomographic findings after contrast-induced seizures in a child. Contrast toxicity should be considered in any case of a new-onset neurologic deficit arising after angiography or enhanced computed tomography. PMID:15730907

Frye, Richard E; Newburger, Jane W; Nugent, Alan; Sahin, Mustafa

2005-03-01

91

Use of 1-ml hollow tube-assisted radial artery catheterization in clinical anesthesiology  

PubMed Central

Objective: To introduce a new modified technique for radial artery catheterization. Materials and Methods: A prolongated needle was made by using routine Vasocan Braunule needle and 1 ml syringe. A table of random digits was used for randomization of 32 interns. 14 interns were involved in group T and 18 interns were in group M. Each intern accomplished 20 cases. Then 640 patients were divided into 2 groups: group T included 280 patients with traditional direct technique, group M included 360 patients with 1 ml hollow tube-assisted technique. Results: Satisfactory results were obtained for 107 patients in group T and 292 patients in group M (P < 0.05). The success rates for catheter insertion after one attempt were 38.2% in group T and 81.1% in group M (P < 0.001). The blood flow times for observation were 1.7 ± 0.2 s in group T and 19.6 ± 1.8 s in group M (P < 0.001). Conclusion: The authors suggested the use of 1 ml hollow tube-assisted radial artery cannulation technique rather than a direct technique. This modified technique provided easy, safe, quick and less cost cannulation. PMID:25356134

Li, Yong-Hua; Wang, Yong-Qiang; Zeng, Lin; Chen, Wei; Yang, Li-Ye; Zhu, Qiu-Feng; Fu, Hai-Long

2014-01-01

92

Cardiovascular procedures/diagnostic techniques and therapeutic procedures  

SciTech Connect

This book covers the technical and therapeutic aspects of cardiovascular procedures in immense detail. There are large and appropriate diagrams and tables. The topics of the chapters are tools for catheterization, venous access, arterial access, hemodynamic monitoring, cardiac catheterization and coronary arteriography, ergonovine provocation testing for coronary artery spasm, pulmonary angiography, endomyocredial biopsy, electrophysiologic studies, pericardiocentesis and drainage, intraaortic balloon pumping, direct current cardioversion and defibrilaltion, pacemaker implantation of the automatic implantable cardioverter/defibrillator, coronary angioplasty, thrombolytic therapy, transluminal catheter extraction and resolution of intracardiac catheter knots, cardiopulmonary resuscitation, contrast media toxicity and allergic reactions, radiation hazards, and medicolegal concerns. An appendix and index follow these chapters. In general, each chapter covers historical aspects, indications, complications, techniques, and preoperative and postoperative care.

Tilkian, A.G.; Daily, E.K.

1986-01-01

93

[Common fractures in a general practice: indication for operations and modern operative technique].  

PubMed

Distal radius, clavicle, malleolar and proximal humerus fractures belong to the most frequent fracture types in every day practice. The initial diagnose with conservative therapy or the postoperative care is often carried out by the general practitioner. In recent years, therapy modality of these fractures changed. With the development of angular stable implants and minimal invasive operations technique, operative treatment is favoured mainly in osteoporotic bone. The mentioned fractures are highlighted. PMID:19953469

Acklin, Y P; Sommer, C

2009-12-01

94

Technique of minimally invasive retrograde instrumentation of femoral shaft fractures. Indications, procedure and first results  

Microsoft Academic Search

Summary  In a consecutive series of 12 cases a newly developed minimally invasive technique was performed using a specially designed\\u000a retrograde dilator system (RDS) for the insertion of the retrograde femoral nail (ACE®-DePuy), the reaming of the femoral canal and the locking of the distal screws. The mean age of the patients (4 men and 8\\u000a women) was 48 (±26) years.

R. J. Stiletto; M. Baacke

2000-01-01

95

IMMUNOLOGICAL AND BIOSENSOR TECHNIQUES FOR DETECTING NON-MICROBIAL INDICATORS OF HUMAN FECAL POLLUTION  

EPA Science Inventory

Limitations exist in applying the conventional microbial methods to the detection of human fecal contamination in water. Recently, there has been an increased interest in developing supplemental and/or alternate indicators of human contamination to better define water quality an...

96

Cardiac catheterization and test occlusion of the interatrial communication after the fenestrated Fontan operation  

Microsoft Academic Search

Objectives. Our objective was to determine whether catheterization data obtained after a fenestrated Fontan operation influenced patient management or predicted functional status.Background. Cardiac catheterization after a fenestrated Fontan operation is undertaken to identify residual lesions and to observe the patient's response to test occlusion of the baffle fenestration.Methods. Sixty patients undergoing both a fenestrated Fontan operation before July 1991 and

Nancy D. Bridges; James E. Lock; John E. Mayer; Janice Burnett; Aldo R. Castaneda

1995-01-01

97

Using a Robotic Arm for Echocardiography to X-ray Image Registration during Cardiac Catheterization  

E-print Network

fluoroscopic guidance. Pure X-ray guidance has a number of disadvantages. Firstly, X-ray images are twoUsing a Robotic Arm for Echocardiography to X-ray Image Registration during Cardiac Catheterization echo probe during cardiac catheterization procedures. By tracking the robotic arm, X-ray table and X-ray

Boyer, Edmond

98

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

99

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

100

[Percutaneous nephrostomy: indications, techniques and results. Retrospective study of 81 cases].  

PubMed

A retrospective study has been made of 81 cases of percutaneous nephrostomy (PCN) which were treated during the period 1989-1998. The mean patient age was 41 years (age range: 21-66 years). The reasons for the diversion via nephrostomy catheter were oligoanuria (43 cases), pyonephrosis (34 cases), and evaluation of renal function (four cases). The initial disease was found to be malignant in 23.25% of cases of oligoanuria, with six cancers of the cervix, three bladder cancers and one prostate cancer. Lithiasis was the main etiology in subjects with benign disease, and was the causative factor of oligoanuria in 55.8% and pyonephrosis in 67.6% of cases, i.e., a total of 47 cases (58%). PCN catheter placement was successfully carried out in 100% of cases, and resulted in improved renal function, and/or in the treatment of the initial infectious syndrome in the majority of cases. PCN is an excellent technique for upper urinary tract drainage due to its simplicity, efficacy, ease of insertion, low cost and satisfactory results. It is a minimally invasive technique, which necessitates only the use of a local anesthetic, a sound knowledge of the human anatomy involved, a trained operator and a minimum of material. PMID:11147081

Tazi, K; Moudouni, S M; Nouri, M; Karmouni, T; Koutani, A; Ibn Attyaa, A A; Hachimi, M; Lakrissa, A

2000-12-01

101

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

102

Changing Indications and Surgical Techniques for Corneal Transplantation Between 2004 and 2009 at a Tertiary Referral Center  

PubMed Central

Purpose: The aim of this study is to report the indications, techniques, and clinical outcomes of corneal transplantation and investigate any changing trends in surgical techniques over a 6 year period. Materials and Methods: Records of patients who had undergone any kind of corneal transplantation at Labbafinejad Medical Center, Tehran, Iran, from January 2004 to December 2009 were reviewed to determine the indications and types of corneal transplantation. Postoperative best-corrected visual acuity, refractive error, graft clarity, and complications were reported. Results: During this period, 1859 eyes of 1624 patients with a mean age of 41.3 ± 21.3 years underwent corneal transplantation. The most common indication was keratoconus (38.4%) followed by aphakic/pseudophakic bullous keratopathy (11.7%), previous failed grafts (10.6%), infectious corneal ulcers (10.1%), non-herpetic corneal scars (7.6%), trachoma keratopathy (4.7%), stromal corneal dystrophies (4.6%), post-herpetic corneal scar (3.7%), Fuchs’ endothelial dystrophy (0.8%), and congenital hereditary endothelial dystrophy (0.4%). Techniques of corneal transplantation included penetrating keratoplasty (PKP; 70.9%), deep anterior lamellar keratoplasty (DALK; 20.1%), conventional lamellar keratoplasty (LKP; 4.4%), and Descemet's stripping automated endothelial keratoplasty (DSAEK; 2.3%). Over the study period, there was a significant increase in the relative frequency of infectious corneal ulcers, failed grafts, and trachoma keratopathy. Additionally, a significant reduction was observed in PKP and LKP procedures, and volume of DALK and DSAEK increased significantly. At final follow-up, 69.0% of grafts were clear in the PKP group. This figure was 82.6%, 82.7%, and 97.6% in the DALK, LKP, and DSAEK groups, respectively. Conclusion: Keratoconus was the most common indication and PKP was the most prevalent technique used for corneal transplantation. However, significant changes in the indications and surgical techniques were observed from 2004 to 2009. PMID:22837628

Zare, Mohammad; Javadi, Mohammad A.; Einollahi, Bahram; Karimian, Farid; Rafie, Ali R. B.; Feizi, Sepehr; Azimzadeh, Ahmad

2012-01-01

103

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

104

Variable Angle Locking Intercarpal Fusion System for Four-Corner Arthrodesis: Indications and Surgical Technique  

PubMed Central

Four-corner fusion (4CF) is an accepted and regularly performed procedure when managing posttraumatic degenerative disorders in the wrist. This procedure consists of excision of the entire scaphoid in association with midcarpal fusion of the remaining four ulnar carpal bones (hamate, capitate, lunate, and triquetrum). In the majority of cases, the long-term outcome is a functional painless wrist. However, the exact procedure to best achieve a rapid solid bone union of the fusion mass without hardware complications remains controversial. The authors have developed a precise system to ensure precise positioning, firm fixation, and fusion at the midcarpal joint together with an early postoperative recovery, avoiding some of the issues reported with other implants used for 4CF. The described implant is a circular plate accommodating variable angle locking screws as well as compression screws that can firmly fix the plate to the carpal bones. The locking technology produces a very solid construct. A special reaming-distraction-compression guide has also been developed to both countersink the plate on the underlying carpal bone mass and allow distraction of the midcarpal joint for debridement and cancellous bone graft interposition. The features of the implant, its surgical technique, and a relevant case are described. PMID:23904983

González del Pino, Juan; Campbell, Douglas; Fischer, Thomas; Vázquez, Fiesky Núñez; Jupiter, Jesse B.; Nagy, Ladislav

2012-01-01

105

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

106

[Posterior pelvic exenteration in locoregional recurrence of rectal carcinoma--indications, technique and outcome].  

PubMed

Despite a potentially curative operation in over 70% of rectal carcinomas, local recurrence is observed in up to 55%. The most common location is at or around the anastomosis and the presacral region. Locoregional recurrence is--apart from distant metastases--the most important factor determining prognosis and survival. If an R0 resection can be performed, a 5-year survival rate of 20-30% can be achieved. Whether patients will benefit from a palliative operation is still a matter of debate. Morbidity is estimated to exceed 60% and perioperative mortality always below 10%. In this article, we review the indication, preoperative diagnostic and therapeutic procedures as well as results of the posterior pelvic exenteration with sacral resection. Taking all aspects into account, posterior pelvic exenteration seems to be justified due to the lack of alternatives and the potential benefit of palliative and curative resection. With respect to the effort in time, personnel, surgical expertise and logistics, this operation should be preferably performed in specialized and well-equipped medical institutions. PMID:11824022

Lehnert, T; Golling, M

2001-12-01

107

Residents learning ultrasound-guided catheterization are not sufficiently skilled to use landmarks  

PubMed Central

Introduction Ultrasound-guided (UG) technique is the recommended procedure for central venous catheterization (CVC). However, as ultrasound may not be available in emergency situations, guidelines also propose that physicians remain skilled in landmark (LM) placement. We conducted this prospective observational study to determine the learning curve of the LM technique in residents only learning the UG technique. Methods During the first three months of their rotation in our ICU, residents inexperienced in CVC used only the real-time UG technique. During the following three months, residents were allowed to place CVC by means of the LM technique when authorized by the attending physician. Results A total of 172 procedures (84 UG and 88 LM) were performed by the inexperienced residents during the study. The success rate was lower (72% versus 84%; P?=?0.05) and the complication rate was higher (22% versus 10%; P?=?0.04) for LM compared to UG procedures. Comparison between the five last UG procedures and the first five LM procedures performed demonstrated that the transition between the two techniques was associated with a marked decrease of the success rate (65% versus 93%; P?=?0.01) and an increase of the complication rate (33% versus 8%; P?=?0.01). After 10 LM procedures, residents achieved a success rate and a complication rate of 81% and 6%, respectively. Conclusions Residents who only learn the UG technique will not be immediately able to perform the LM technique, but require specific training based on at least 10 LM procedures. The question of whether or not the LM technique should still be taught when an ultrasound device is not available must therefore be addressed. PMID:24559179

2014-01-01

108

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

Microsoft Academic Search

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

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

2007-01-01

109

Performance of central venous catheterization by medical students: a retrospective study of students' logbooks  

PubMed Central

Background Medical students often learn the skills necessary to perform a central venous catheterization in the operating room after simulator training. We examined the performance of central venous catheterization by medical students from the logbooks during their rotation in department of anesthesiology. Methods From the logbooks of medical students rotating in our department between January 2011 and June 2012, we obtained the kind and the number of central venous catheterization students had done, the results of the procedures whether they were success or failed, the reasons of the failures, complications, and the student self-reported confidence and satisfaction of their performance. Results There were 93 medical students performed 875 central venous catheterizations with landmark guidance on patients in the operating theater, and the mean number of catheterizations performed per student was 9.4?±?2.0, with a success rate of 67.3%. Adjusted for age, sex, body mass index, surgical category, ASA score and insertion site, the odds of successful catherization improved with cumulative practice (odds ratio 1.10 per additional central venous catheterization performed; 95% confidence interval 1.05–1.15). The major challenge students encountered during the procedure was the difficulty of finding the central veins, which led to 185 catheterizations failed. The complication rate of central venous catheterization by the students was 7.8%, while the most common complication was puncture of artery. The satisfaction and confidence of students regarding their performance increased with each additional procedure and decreased significantly if failure or complications had occurred. Conclusion A student logbook is a useful tool for recording the actual procedural performance of students. From the logbooks, we could see the students’ performance, challenges, satisfaction and confidence of central venous catheterization were improved through cumulative clinical practice of the procedure. PMID:25123826

2014-01-01

110

Hepatic laceration as a life-threatening complication of umbilical venous catheterization.  

PubMed

Umbilical venous catheterization is an intravenous infusion route for maintenance fluids, medications, blood products, and parenteral nutrition in preterm neonates. However, this procedure may be associated with several complications, such as infection, thrombosis, vessel perforation, and cardiac and hepatic injuries. Hepatic laceration is a rare but life-threatening complication of umbilical venous catheterization that is a result of direct injury through the liver parenchyma. Here, we present a preterm newborn with hepatic laceration as a rare and serious complication of umbilical venous catheterization. PMID:21980821

Gülcan, Hande; Hanta, Deniz; Törer, Birgin; Temiz, Adbülkerim; Demir, Senay

2011-01-01

111

Incidence and predictors of radial artery occlusion associated transradial catheterization.  

PubMed

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 3(rd) h of intervention, the radial artery was checked by palpation; color doppler ultrasonography was performed at the 24(th) 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

112

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

113

Cardiac catheterization within 24 hours of valve surgery is significantly associated with acute renal failure  

PubMed Central

Objective Acute renal failure after valve surgery carries significant morbidity and mortality. Preoperative cardiac catheterization is the standard of care. For convenience, catheterization just before surgery is simplest for patients. However, it is not known if this timing of radiocontrast administration significantly affects renal function. We hypothesized that preoperative cardiac catheterization within 24 hours of valve surgery is associated with the development of acute renal failure. Methods A retrospective case-control study was performed of all patients undergoing valve surgery between 2003 and 2008 at the University of Virginia. Patients with preoperative renal dysfunction were excluded. Patients with postoperative acute renal failure were matched to those without acute renal failure according to age, gender, year of surgery, New York Heart Association functional class, elective status, concomitant coronary artery bypass grafting, and type of valve procedure. A logistic regression model examined the effects of perioperative risk factors on the development of acute renal failure. Results Of 1287 patients undergoing valve surgery, 61 with acute renal failure were matched to 136 without acute renal failure. Cardiac catheterization within 24 hours of surgery was significantly greater in patients with acute renal failure (31.2% vs 8.8%, P = .013). The risk of acute renal failure was more than 5 times higher for patients undergoing catheterization within 24 hours of surgery (odds ratio, 5.3; P = .004). The number of postoperative vasopressors was significantly associated with acute renal failure (odds ratio, 1.7; P = .007). Conclusions Although catheterization is often performed for patient convenience, catheterization within 24 hours of valve surgery is significantly associated with the development of acute renal failure. Current practices should be adjusted to ensure that more than 24 hours have passed from the time of cardiac catheterization to valve surgery in elective settings. PMID:20828767

Hennessy, Sara A.; LaPar, Damien J.; Stukenborg, George J.; Stone, Matthew L.; Mlynarek, Ryan A.; Kern, John A.; Ailawadi, Gorav; Kron, Irving L.

2011-01-01

114

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

115

Catheterization of intestinal loops in ruminants does not adversely affect loop function.  

PubMed

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

2010-12-01

116

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.

Badiee, Zohreh; Sadeghnia, Alireza; Zarean, Noushin

2014-01-01

117

Obtaining oblique technique source-to-skin distances for irregular field (Clarkson) calculations: The Mayo Off-axis Distance Indicator  

SciTech Connect

Significant dose inhomogeneities may exist between the supraclavicular fossa (SCF) and the internal mammary chain (IMC) regions in the irregular L-shaped (hockey stick) field associated with breast cancer treatments. This dose inhomogeneity exists, in part, because of a positive air gap in the SCF and a negative air gap in the IMC locations. Independent of treatment technique, (i.e., whether anterior-posterior (AP) or oblique fields are used), accurate source-to-skin distance (SSD) values for the SCF, IMC, and axilla are necessary when doing an irregular field (Clarkson) dose calculation. However, when an oblique technique is used to treat the hockey stick field, obtaining non-central-axis SSDs is not as straightforward as when an AP technique is employed. The Mayo Off-axis Distance Indicator was constructed to slide into the blocking tray slot of the simulator or treatment machine. This mechanical measuring device provides quick and accurate SSD measurements for non-central-axis points under either AP or, more importantly, oblique treatment conditions.

Lajoie, W.N. (Mayo Medical Center, Rochester, MN (USA))

1988-09-01

118

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

119

A peculiar complication of suprapubic catheterization: Recurrent ureteral obstruction and hydronephrosis  

PubMed Central

Context Suprapubic cystostomy (SPC) catheterization is a common and important technique for the management of vesicular drainage, especially in patients with neurogenic bladder. Some serious complications include bowel perforation and obstruction. Findings A 55-year-old man with C6 American Spinal Injury Association B tetraplegia and a urethral stricture requiring a chronic SPC was admitted for recurrent urosepsis. Computed tomography (CT) of the abdomen revealed severe right hydronephrosis and hydroureter due to obstruction of the right distal ureter by the SPC tip. The SPC (30 French/10-mm silicone catheter with a 10-ml balloon) was removed and replaced with a similar suprapubic catheter (30 French/10-mm silicone catheter with an 8-ml balloon). Symptoms recurred 2 months later and he was readmitted for urosepsis. CT of the abdomen again revealed severe right hydronephrosis and hydroureter due to obstruction of the right distal ureter by the SPC tip. The SPC was removed, and the patient was given a 14 French/4.67-mm urethral silicone catheter with a 5-ml balloon. Follow-up CT of the abdomen 2 months later showed complete resolution of the hydronephrosis and hydroureter. Of note, urodynamic studies 2 years earlier revealed an extremely small bladder with a capacity less than 20 ml. Conclusion This case illustrates that obstruction of the ureter by the tip of an SPC can be a cause of recurrent hydronephrosis and urosepsis. PMID:23809534

Adeyemo, Bamidele; Makovitch, Steven; Foo, Dominic

2013-01-01

120

Incidence of intravascular insertion in thoracic epidural catheterization by using real time fluoroscopy  

PubMed Central

Background Epidural analgesia is commonly used to provide several types of pain relief. Although this technique has been widely used with many advantages, currently the complications appear to be increasing. Especially, inadvertent intravascular cannulation and intravascular local anesthetic administration can lead to fatal consequences. Methods Data was collected on 296 patients undergoing elective thoracic or abdominal surgery. Two detection methods were utilized to confirm the epidural intravascular cannulation; flashback and aspiration of indwelling catheter, and injection of a contrast agent through the catheter under fluoroscopy were used to guide the placement of the catheter and to examine the intravascular cannulation. Results Epidural intravascular cannulation was reported in 4 out of 296 cases (1.4%), and 1 patient underwent subdural cannulation. Among the 4 cases of epidural intravascular cannulation, two were confirmed by the flashback and aspiration methods, while the remaining cases were only detected by real time fluoroscopy. Conclusions In this study, inadvertent epidural intravascular cannulation occurred by as much as 1.4% of thoracic epidural catheterization. Utilizing real time fluoroscopy in addition to flashback and aspiration can enhance the sensitivity of detection. PMID:22474552

Kim, Yun Young; Kim, Ae Ra

2012-01-01

121

Extracellular volume and blood volume in chronically catheterized fetal sheep.  

PubMed Central

1. To determine the extracellular volume (ECV) in fetal sheep and its distribution between the plasma and interstitial spaces, ECV, blood volume (BV) and haematocrit were measured in ten chronically catheterized fetal sheep aged 121-133 days. Relationships with age, weight and other fetal variables, including glomerular filtration rate (GFR), were studied. 2. ECV was measured as the mean of the volumes of distribution of [3H]inulin and [14C]mannitol extrapolated to time zero. The time zero volume of distribution was 1506 +/- 79 ml (means +/- S.E.M.) for inulin and 1590 +/- 80 ml for mannitol. The ECV was 1548 +/- 79 ml (632 +/- 18 ml (kg fetal wt)-1). BV, measured using 51Cr-labelled red cells, was 351 +/- 27 ml (141 +/- 6 ml kg-1). Haematocrit, plasma volume and interstitial volume were 34 +/- 1%, 229 +/- 17 ml (92 +/- 3 ml kg-1) and 1319 +/- 63 ml (540 +/- 17 ml kg-1), respectively. 3. Interstitial volume per kilogram fell with increasing fetal weight (P = 0.026). BV per kilogram did not change with weight or age. 4. The plasma: interstitial volume ratio was 0.17 +/- 0.01. This ratio increased as fetal weight and age increased (P = 0.026 and P = 0.044), that is, the proportion of ECV that was contained outside the vascular compartment was lower in heavier or older fetuses. 5. Since GFR was 3.4 +/- 0.4 ml min-1, the entire fetal ECV was filtered by the fetal kidney only 3.1 +/- 0.3 times per day. PMID:7562621

Gibson, K J; Lumbers, E R

1995-01-01

122

Resection and reconstruction of the carotid bifurcation with polytetrafluoroethylene grafts; operative technique. Preliminary results in 25 procedures and indications.  

PubMed

Although carotid endarterectomy is the standard procedure, the purpose of this paper is to describe a new surgical technique and indicate its role in the surgery of cervical cerebrovascular disease. The technique consists of resection of the pathologic carotid artery bifurcation followed by its total replacement with a bifurcated thin-wall polytetrafluoroethylene (PTFE) graft constructed by the surgeon. Prosthetic graft reconstruction of the carotid bifurcation (PGRCB) was performed in 21 patients (25 procedures) from November 1984 to May 1987. Many patients were over 70 years old. The indications for surgery were transient ischemic attacks (TIA)'s in 10 patients (high-grade stenosis), established stroke with mild deficit in 3 patients (high-grade stenosis). Eight patients (high-grade stenosis) were asymptomatic and 4 had vertebro-basilar symptoms. In 11 procedures the indications were the same as for standard carotid endarterectomy (significant stenosis and/or ulcerated plaque). In 14 cases, the procedure was justified by extensive lesions involving a long segment of the internal carotid artery (2 restenoses, 12 calcified lesions). In the perioperative period, there were no deaths and no TIA's. The 25 procedures were assessed one month postoperatively by ultrasonic imaging and venous substraction angiography. All the grafts were patent with perfect restoration of the carotid bifurcation anatomy. Systematic follow-up study was carried out in 1987. Three patients had died of non-neurologic causes and one was lost to study. The remaining 19 procedures were evaluated with an average follow-up of 19 months (range 7 to 32 months). The patients were asymptomatic and all the grafts remained patent including one stenosis (greater than 50%) at the common carotid artery anastomosis. Because recent studies have documented a much higher rate of technical defects or recurrent stenosis after carotid endarterectomy, we believe that PGRCB merits consideration, particularly in difficult endarterectomies, and in recurrent carotid stenosis. Furthermore it seems acceptable to advocate PGRCB in aneurysms of the internal carotid artery and in post-irradiation arteritis. PMID:1864868

Castellani, L; Benhamou, A C; Angel, F; Garces, D; al Kassar, T

1991-01-01

123

Comparison of Ultrasonography-Guided Central Venous Catheterization Between Adult and Pediatric Populations  

SciTech Connect

The purpose of this study was to compare the technical success and complication rates of ultrasonography-guided central venous catheterization between adult and pediatric patients which have not been reported previously. In a 4-year period, 859 ultrasonography-guided central vein catheterizations in 688 adult patients and 247 catheterizations in 156 pediatric patients were retrospectively evaluated. Mean age was 56.3 years (range, 18 to 95 years) for adults and 3.3 years (range, 0.1 to 16.3 years) for children. The preferred catheterization site was internal jugular vein in 97% of adults and 85% of children. The technical success rate, mean number of punctures, and rate of single wall puncture were 99.4%, 1.04 (range, 1-3), and 83% for adults and 90.3%, 1.25 (range, 1-5), and 49% for children, respectively. All the differences were statistically significant (p < 0.05). Complication rates were 2.3% and 2.4% for adults and children, respectively (p > 0.05). Major complications such as pneumothorax and hemothorax were not seen in any group. In conclusion, ultrasonography-guided central venous catheterization has a high technical success rate, lower puncture attempt rate, and higher single wall puncture rate in adults compared to children. Complication rates are comparable in the two groups.

Tercan, Fahri [Baskent Universitesi, Adana Arastirma ve Uygulama Merkezi (Turkey)], E-mail: ftercan@yahoo.com; Oguzkurt, Levent; Ozkan, Ugur [Baskent University Faculty of Medicine, Department of Radiology (Turkey); Eker, Hatice Evren [Baskent University Faculty of Medicine, Department of Anesthesiology (Turkey)

2008-05-15

124

Procedural costs of digital vs. analog archiving of diagnostic cardiac catheterizations.  

PubMed

The use of digital technology in the cardiac catheterization laboratory is expanding at a rapid pace. The cost-effectiveness of this new technology is yet to be proven. The aims of this study were to determine the direct cost differences of digital versus analog media (CDs) for the storage of diagnostic cardiac catheterizations and to explore the factors influencing these differences. Procedural costs of all diagnostic angiograms (n = 109), from three physicians, performed in an analog catheterization laboratory (room A) and a digital catheterization laboratory (room C) were compared during a 9-month period. The mean procedural cost was higher in room A than in room C ($1,102 vs. $1,087, P < 0.001). This cost difference was eliminated when recording media costs were excluded from analysis ($1,079 vs. $1,080, P = 0.931). Therefore, we conclude there is a procedural cost savings in a cardiac catheterization room that uses digital CDs versus cineangiogram film as the archival media. Cathet. Cardiovasc. Intervent. 49:246-250, 2000. PMID:10700050

Oetgen, M E; New, G; Moussa, I; Balter, S; Collins, M; Iyer, S; Roubin, G; Colombo, A; Moses, J W

2000-03-01

125

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

126

Catheterization of pulmonary artery in rats with an ultraminiature catheter pressure transducer.  

PubMed

Utilizing new materials and miniaturization techniques, an ultraminiature catheter pressure transducer for catheterization of the pulmonary artery (PA) has been developed and applied in intact, spontaneously breathing, anesthetized rats. The catheter arrangement consists of three components: 1) an SPR-671 ultraminiature pressure transducer (measuring catheter), 2) a plastic introducer (sheath) that is slipped over the measuring catheter, and 3) an external wire mounted on the outside of the introducer for bending its tip. The measuring catheter is first inserted through the right jugular vein into the right ventricle. The introducer is then slipped over it. The tip of the introducer is bent so that there is an angle of approximately 90 degrees or less to the shaft. The measuring catheter is advanced across the pulmonary valve into the PA. Measurements of pulmonary arterial pressure were made in five male Long Evans (364 +/- 7 g body wt) and five female Sprague-Dawley (244 +/- 7 g body wt) rats under control conditions. The effects of infusion of norepinephrine (0.1 mg.kg(-1).h(-1) iv for 20-min duration) were tested in Long Evans rats. Pulmonary arterial systolic pressure measurements were 34.0 +/- 0.8 and 29.5 +/- 0.4 mmHg, and diastolic pressure values were 23.6 +/- 0.8 and 18.1 +/- 0.6 mmHg in male Long Evans and female Sprague-Dawley rats, respectively. Norepinephrine induced an increase in pulmonary arterial systolic (40.8 +/- 0.1 mmHg) and diastolic (28.6 +/- 0.4 mmHg) pressures and an elevation in pulmonary vascular resistance from a control value of 0.093 +/- 0.003 to 0.103 +/- 0.004 mmHg.kg.min.ml(-1). PMID:12881215

Deten, Alexander; Millar, Huntly; Zimmer, Heinz-Gerd

2003-11-01

127

Efficacy and safety of transient ulnar artery compression to recanalize acute radial artery occlusion after transradial catheterization.  

PubMed

Radial artery occlusion (RAO) can result from transradial catheterization. We compared the incidence of RAO with 2 heparin dosage regimens after transradial coronary angiography, and we evaluated the efficacy and safety of transient homolateral ulnar artery compression to achieve acute radial artery recanalization. Patients referred for coronary angiography were randomized to very-low-dose heparin (2,000 IU) or low-dose heparin (5,000 IU). On sheath removal, hemostasis was obtained using the TR band with a plethysmography-guided patent hemostasis technique. In the case of RAO as assessed by duplex ultrasonography 3 to 4 hours after hemostasis, immediate 1-hour ulnar artery compression was applied. Hematomas >15 cm(2) were also assessed. We randomized 465 patients, 222 in the 2,000-IU group and 243 in the 5,000-IU group. The baseline and procedural characteristics were comparable in both groups. The incidence of initial RAO was 5.9% in the 2,000-IU group and 2.9% in the 5,000-IU group (p = 0.17), with a compression time of 2.10 ± 0.78 hours and 2.25 ± 0.82 hours, respectively (p = 0.051). After ulnar artery compression, the final incidence of RAO was 4.1% in the 2,000-IU group and 0.8% in the 5,000-IU group (p = 0.03). The incidence of local hematoma was 2.3% and 3.7% in the 2,000- and 5,000-IU groups, respectively (p = 0.42). In conclusion, acute RAO after transradial catheterization can be recanalized by early 1-hour homolateral ulnar artery compression. This simple nonpharmacologic method was effective and safe in patients with very-low- and low-dose heparin. Nevertheless, the incidence of final RAO remained significantly lower after a higher anticoagulation level. PMID:21439528

Bernat, Ivo; Bertrand, Olivier F; Rokyta, Richard; Kacer, Martin; Pesek, Jan; Koza, Jiri; Smid, Michal; Bruhova, Hana; Sterbakova, Gabriela; Stepankova, Lucie; Costerousse, Olivier

2011-06-01

128

Direct measurement of a patient's entrance skin dose during pediatric cardiac catheterization  

PubMed Central

Children with complex congenital heart diseases often require repeated cardiac catheterization; however, children are more radiosensitive than adults. Therefore, radiation-induced carcinogenesis is an important consideration for children who undergo those procedures. We measured entrance skin doses (ESDs) using radio-photoluminescence dosimeter (RPLD) chips during cardiac catheterization for 15 pediatric patients (median age, 1.92 years; males, n = 9; females, n = 6) with cardiac diseases. Four RPLD chips were placed on the patient's posterior and right side of the chest. Correlations between maximum ESD and dose–area products (DAP), total number of frames, total fluoroscopic time, number of cine runs, cumulative dose at the interventional reference point (IRP), body weight, chest thickness, and height were analyzed. The maximum ESD was 80 ± 59 (mean ± standard deviation) mGy. Maximum ESD closely correlated with both DAP (r = 0.78) and cumulative dose at the IRP (r = 0.82). Maximum ESD for coiling and ballooning tended to be higher than that for ablation, balloon atrial septostomy, and diagnostic procedures. In conclusion, we directly measured ESD using RPLD chips and found that maximum ESD could be estimated in real-time using angiographic parameters, such as DAP and cumulative dose at the IRP. Children requiring repeated catheterizations would be exposed to high radiation levels throughout their lives, although treatment influences radiation dose. Therefore, the radiation dose associated with individual cardiac catheterizations should be analyzed, and the effects of radiation throughout the lives of such patients should be followed. PMID:24968708

Sun, Lue; Mizuno, Yusuke; Iwamoto, Mari; Goto, Takahisa; Koguchi, Yasuhiro; Miyamoto, Yuka; Tsuboi, Koji; Chida, Koichi; Moritake, Takashi

2014-01-01

129

History of right heart catheterization: 100 years of experimentation and methodology development.  

PubMed

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 intensive care unit 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 intensive care unit 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

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

Direct measurement of a patient's entrance skin dose during pediatric cardiac catheterization.  

PubMed

Children with complex congenital heart diseases often require repeated cardiac catheterization; however, children are more radiosensitive than adults. Therefore, radiation-induced carcinogenesis is an important consideration for children who undergo those procedures. We measured entrance skin doses (ESDs) using radio-photoluminescence dosimeter (RPLD) chips during cardiac catheterization for 15 pediatric patients (median age, 1.92 years; males, n = 9; females, n = 6) with cardiac diseases. Four RPLD chips were placed on the patient's posterior and right side of the chest. Correlations between maximum ESD and dose-area products (DAP), total number of frames, total fluoroscopic time, number of cine runs, cumulative dose at the interventional reference point (IRP), body weight, chest thickness, and height were analyzed. The maximum ESD was 80 ± 59 (mean ± standard deviation) mGy. Maximum ESD closely correlated with both DAP (r = 0.78) and cumulative dose at the IRP (r = 0.82). Maximum ESD for coiling and ballooning tended to be higher than that for ablation, balloon atrial septostomy, and diagnostic procedures. In conclusion, we directly measured ESD using RPLD chips and found that maximum ESD could be estimated in real-time using angiographic parameters, such as DAP and cumulative dose at the IRP. Children requiring repeated catheterizations would be exposed to high radiation levels throughout their lives, although treatment influences radiation dose. Therefore, the radiation dose associated with individual cardiac catheterizations should be analyzed, and the effects of radiation throughout the lives of such patients should be followed. PMID:24968708

Sun, Lue; Mizuno, Yusuke; Iwamoto, Mari; Goto, Takahisa; Koguchi, Yasuhiro; Miyamoto, Yuka; Tsuboi, Koji; Chida, Koichi; Moritake, Takashi

2014-11-01

132

[Transradial percutaneous approach for cardiac catheterization in patients with previous brachial artery cutdown].  

PubMed

The percutaneous punction of the radial artery for catheterization procedures has gained acceptance lately. This was a consequence of achieving results similar to the femoral approach, with the benefits of a lower rate of complications and increased comfort for the patients post procedure. Recently it has gained an additional impulse with the better prognosis obtained in acute coronary syndromes. In this trial we have evaluated if the feasibility, results and advantages related with the use of the radial artery percutaneous approach to perform catheterization procedures, continues when used in patients who have had a previous brachial artery cutdown. Out of a total of 1356 percutaneous radial accesses, 53 were in patients with previous brachial artery cutdown. Through this access 71 catheterization procedures were performed, achieving access success in 96.2% (51/53) of the punctions. Once the access success was obtained, 93.6% (44/47) of the diagnostic procedures and 100% (24/24) of the therapeutics procedures were successful. During hospitalization, in this group of patients, no major adverse cardiac events occurred and there was a 1.4% (1/71) rate of minor events. At seven days follow up, no new complications were recorded. Although this is a small group, we believe that it is enough to show that percutaneous punctions of the radial artery to perform catheterization procedures, in patients with previous brachial artery cutdown, are feasible, allowing high access and procedure success rates, with a low frequency of complications. PMID:23335700

Magariños, Eduardo; Solioz, Germán; Cermesoni, Gabriel; Koretzky, Martín; Carnevalini, Mariana; González, Daniel

2013-01-01

133

A Simple and Effective Regimen for Prevention of Radial Artery Spasm during Coronary Catheterization  

Microsoft Academic Search

Radial artery spasm occurs frequently during the transradial approach for coronary catheterization. Premedications with nitroglycerin and verapamil have been documented to be effective in preventing radial spasms. Verapamil is relatively contraindicated for some patients with left ventricular dysfunction, hypotension and bradycardia. We would like to know whether nitroglycerin alone is sufficient for the prevention of radial artery spasm. We conducted

Chih-Wei Chen; Chin-Lon Lin; Tin-Kwang Lin; Chih-Da Lin

2006-01-01

134

Subclavian artery pseudoaneurysm: a rare and serious complication of central venous catheterization in an infant  

Microsoft Academic Search

Serious complications of central venous access occur in 0.4–9.9% of patients undergoing attempted central venepuncture. We\\u000a report an unusual case of an 18-month-old infant in whom a right subclavian artery pseudoaneurysm developed rapidly after\\u000a attempted subclavian vein catheterization without US guidance failed.

Esad Koklu; Hakan Poyrazoglu; Ali Yikilmaz; Mehmet Canpolat; Bahadir Konuskan

2008-01-01

135

Radiation exposure of pediatric patients and physicians during cardiac catheterization and balloon pulmonary valvuloplasty.  

PubMed

Thermoluminescent dosimeters were applied to various areas of 61 pediatric patients and physicians to measure radiation doses during routine cardiac catheterization and during 4 cases of balloon pulmonary valvuloplasty. Radiation doses were measured during chest roentgenography, fluoroscopy and cineangiography. Average skin dose to the chest was 121 microGy during chest x-ray, 5,182 microGy during catheterization and 641 mGy during valvuloplasty. For the eyes, thyroid and gonads of the patients, the exposure during routine catheterization was equal to 0.4, 6 and 0.2 chest x-rays, respectively. Radiation dose of the operator was 3 microGy for the eyes and 6 miCroGy in the thyroid. About 56% of the operator's dose could be reduced by thyroid shields, and 80% by lead aprons. The assistant received only 1 microGy outside the thyroid shield. Therefore, we have concluded that the patients' dose during routine catheterization is largely based on our experimental results, but the dose is acceptable based on the risk factor analysis. The skin dose to the right lateral chest of the patient during valvuloplasty is extremely high, perhaps as high as the equivalent of 1,000 chest x-rays. Besides the clinical benefits of valvuloplasty, the long-term radiation-related hazards to the patient should be carefully monitored. PMID:2063785

Wu, J R; Huang, T Y; Wu, D K; Hsu, P C; Weng, P S

1991-07-15

136

Novel miniature MRI-compatible fiber-optic force sensor for cardiac catheterization procedures  

Microsoft Academic Search

This paper presents the prototype design and development of a miniature MR-compatible fiber optic force sensor suitable for the detection of force during MR-guided cardiac catheterization. The working principle is based on light intensity modulation where a fiber optic cable interrogates a reflective surface at a predefined distance inside a catheter shaft. When a force is applied to the tip

Panagiotis Polygerinos; Pinyo Puangmali; Tobias Schaeffter; Reza Razavi; Lakmal D. Seneviratne; Kaspar Althoefer

2010-01-01

137

MRI-Compatible Fiber-Optic Force Sensors for Catheterization Procedures  

Microsoft Academic Search

Cardiac catheterization is an interventional procedure that is usually carried out without the use of force sensors. During such procedures the physician mainly relies on visual feedback provided by an imaging modality, like X-ray fluoroscopy, Computed Tomography (CT) or Magnetic Resonance Imaging (MRI). Hence, the physician it is not always able to predict the forces between the catheter and blood

Panagiotis Polygerinos; Dinusha Zbyszewski; Tobias Schaeffter; Reza Razavi; Lakmal D. Seneviratne; Kaspar Althoefer

2010-01-01

138

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

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

A comparison between different windows in spectral and cross spectral analysis techniques with Kalman filtering for estimating power quality indices  

Microsoft Academic Search

Fourier based methods are still popular for calculating power quality indices (PQIs) in the technical community such as IEC and IEEE. They are robust towards noise and can be calculated efficiently using the fast Fourier transform (FFT) method. IEEE Std 1459-2010 provides formulations for calculating important PQI for single and three phase systems. The aim of this paper is to

Reza Zolfaghari; Yash Shrivastava; Vassilios G. Agelidis

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

Comparison of silicone and polyurethane catheters for the catheterization of small vessels in mice.  

PubMed

Vascular catheterization is increasingly carried out in laboratory mice, but the long-term patency of catheters implanted in mice is limited owing to their small size. The authors compared mice that were catheterized in their right common carotid artery either with a silicone catheter with a polyurethane tip or with a 100% polyurethane catheter to determine which catheter type was better suited for long-term studies in mice. The catheters were inspected daily and were flushed if blood was visible in the catheters; if no blood was visible, they were flushed every 3 d. Silicone catheters were patent for a shorter period of time than polyurethane catheters, which were patent for a median of 6 d and up to 25 d. The authors identify the principal causes of catheter failure and discuss how they can be prevented. PMID:25333592

Teilmann, Anne Charlotte; Falkenberg, Malene Kari; Hau, Jann; Abelson, Klas Stig Peter

2014-10-21

143

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

144

Two-fluid non-Newtonian models for blood flow in catheterized arteries — A comparative study  

Microsoft Academic Search

Steady flow of blood through catheterized arteries is studied by assuming the blood as a two-fluid model with the suspension\\u000a of all the erythrocytes in the core region as a non-Newtonian fluid and the plasma in the peripheral layer as a Newtonian\\u000a fluid. The non-Newtonian fluid in the core region of the artery is modeled as (i) Casson fluid and

D. S. Sankar; Usik Lee

2009-01-01

145

X-Ray of One-Sided "White Lung" after Central Venous Catheterization  

PubMed Central

Complications during insertion of a subclavian central venous line are rare but potentially serious. This case report describes the radiological abnormality of a one-sided pleural effusion during a routine control directly after a difficult central venous catheterization. We illustrate the findings, the initial emergency management, and our procedure to rule out an iatrogenic hemothorax. Possible differential diagnoses and strategies for management of a suspected complication are discussed. PMID:24563796

Ummenhofer, Wolfgang

2014-01-01

146

Simplified pulmonary vasodilatory testing in the cardiac catheterization laboratory with nasal cannula nitric oxide.  

PubMed

In patients with pulmonary hypertension, pulmonary vasodilator testing with inhaled nitric oxide (NO) during cardiac catheterization provides valuable data for defining future care plans. Previously, the use of delivery systems for spontaneously breathing individuals required a tight-fitting seal by face mask and an approved delivery and dilution device. We hypothesized that a simplified delivery system using nasal cannula could be utilized to effectively deliver NO during cardiac catheterization. We developed a simple delivery system to deliver through a nasal cannula a concentration of NO at 50 ppm at the nares along with supplemental oxygen (O2) via face tent. We prospectively employed this system for 10-minute intervals on 11 patients (age range, 7 months to 41 years) with pulmonary hypertension undergoing scheduled cardiac catheterization. Mean pulmonary artery pressure (PAp) decreased from 62 mmHg (range, 38-99) at room air testing to 45 mmHg (range, 36-91) with the addition of NO plus O2 (p = 0.014). Pulmonary vascular resistance (PVR) decreased from 11.6 U.m2 (range, 4.5-43.4) to 6.3 U.m2 (range, 2.0-34.2) (p = 0.001). A response of 20% or more reduction in PVR was seen in all 11 patients. The initial ratio of pulmonary to systemic vascular resistance (Rp:Rs) was 0.49 (range, 0.25-3.5) and decreased to 0.35 (range 0.1-2.6) (p = 0.002). No adverse side effects were noted. We found this NO delivery system to be a simple and effective method of pulmonary vasodilatory testing that may have wide applicability in the cardiac catheterization laboratory. PMID:16261276

Scheurer, M; Bandisode, V; Atz, A M

2006-01-01

147

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

148

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

149

Freestyle-Like V-Y Flaps of the Eyebrow: A New Outlook and Indication of an Historical Technique  

PubMed Central

The eyebrow region is of utmost importance for facial movement, symmetry, and the overall cosmetic appearance of the face. Trauma or tumor resection often leave scars that may dislocate the eyebrow producing an alteration both in static symmetry of the face and in the dynamic expressivity. The authors present a technique for eyebrow's defects repair using the remaining eyebrow advancement by means of a “freestyle-like” V-Y flap. In the past two years a total of eight consecutive patients underwent excision of skin lesions in the superciliary region and immediate reconstruction with this technique. On histology, six patients were affected from basal cell carcinomas, one from squamous cell carcinoma, and one from congenital intradermal melanocytic nevus. The pedicle of the flap included perforators from the supratrochlear, supraorbital, or superficial temporalis artery. Advancement of the entire aesthetic subunit that includes the eyebrow using a V-Y perforator flap was performed successfully in all cases achieving full, tension-free closure of defects up to 3.0?cm. “Freestyle-like” V-Y flaps should be considered as a first-line choice for partial defects of the eyebrow. The greater mobility compared to random subcutaneous flaps allows to reconstruct large defects providing an excellent cosmetic result. PMID:24235879

Leto Barone, Angelo Alberto; Giunta, Gabriele; Di Rosa, Luigi; Cordova, Adriana

2013-01-01

150

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

151

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

152

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

153

A prospective observational study of the outcome of central venous catheterization in 100 patients  

PubMed Central

Context: To Study the outcome following central vein catheterization in patients receiving chemotherapy. Aims: To Study the outcome of central venous catheterization in terms of difficulty during insertion, duration, incidence of infections and other complications and reasons for removal. Settings and Designs: Prospective observational study conducted in 100 patients attending to Gujarat Cancer and Research Institute. Materials and Methods: Both onco-medical and onco-surgical patients who required insertion of central venous catheters were enrolled after ethical approval from June 2008 to November 2010. The study comprised 100 patients. Statistical Analysis Used: Mean and percentage. Results: Mean duration of the indwelling catheter was 109 days for Hickman catheter, 39 days for cavafix and 59 days for certofix. Difficulty in insertion and arrhythmias were common complications. There were no incidences of major life threatening complications. Catheter related infection was 30%. The commonest reason for catheter removal was treatment completion 72%. The next frequent cause was catheter infection 14% and patient death 6%. Conclusions: Even though central venous catheterization is associated with acceptable complications, they serve a useful aid in management of patients on chemotherapy.

Kumar, Arun H. D.; Srinivasan, Nataraj M.; Thakkar, Jayashree M.; Mathew, Shaji

2013-01-01

154

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

155

Recurrence Plot and Recurrence Quantification Analysis Techniques for Detecting a Critical Regime. Examples from Financial Market Indices  

E-print Network

Recurrence Plot (RP) and Recurrence Quantification Analysis (RQA) are signal numerical analysis methodologies able to work with non linear dynamical systems and non stationarity. Moreover they well evidence changes in the states of a dynamical system. We recall their features and give practical recipes. It is shown that RP and RQA detect the critical regime in financial indices (in analogy with phase transition) before a bubble bursts, whence allowing to estimate the bubble initial time. The analysis is made on DAX and NASDAQ daily closing price between Jan. 1998 and Nov. 2003. DAX is studied in order to set-up overall considerations, and as a support for deducing technical rules. The NASDAQ bubble initial time has been estimated to be on Oct. 19, 1999.

A. Fabretti; M. Ausloos

2004-12-31

156

Deploying a metal adsorbent in situ: a technique for indicating bioavailable Cd(II) in marine waters.  

PubMed

This paper reports a study into the deployment of a metal adsorbent in situ to estimate bioavailable Cd(II) in marine waters. Eight adsorbents were screened in the laboratory to test their ability to accumulate Cd(II) from deionised water and artificial seawater, and an oxidised activated carbon was selected for further investigation. The adsorption isotherm at Cd(II) concentrations 0.16-38 microgl(-1) and at salinity 15 followed the Freundlich equation. The adsorbent was contained in nylon bags (pore size 35 microm) and dialysis tubes (membrane pore size 2 nm) to produce deployable devices and to investigate the effect of housing material on Cd(II) accumulation. The devices were tested in the laboratory and deployed at four field sites for up to 3 weeks. The adsorbent in the nylon bags reached equilibrium towards the end of this period and the measured contents were in good agreement with expected contents predicted from known seawater Cd(II) concentrations and the adsorption isotherm. The dialysis tubes accumulated significantly lower amounts of Cd(II) than the nylon bags, probably due to an initial lag as Cd(II) diffused into the dialysis bag and due to biofouling which reduced diffusion. The relationship between concentrations of Cd(II) accumulated by the mussels (indicating the bioavailable Cd(II) fraction) and the devices at different field sites could be described by the Freundlich model. The goodness of fit of this relationship was better for the dialysis tubes than the nylon bags. The adsorbent in the nylon bags may have collected small particles from seawater which affected the Cd(II) analysis. Both devices demonstrate potential as indicators of the relative bioavailable fraction of Cd(II) to Mytilus edulis in marine waters. PMID:15016536

Solbrå, Susan; Allison, Nicola; Skei, Jens; Waite, Stephen; Mikhalovsky, Sergey

2004-03-01

157

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

158

Lethal cardiac arrhythmia during central venous catheterization in a uremic patient: a case report and review of the literature.  

PubMed

Double-lumen central venous catheter (CVC) is a rapid access technique for hemodialysis (HD) when an arteriovenous fistula or graft is not available. A variety of procedure-related complications have been reported, such as infection and pneumothorax, but serious cardiac complications are relatively less mentioned. We report a uremic woman with preexisting left bundle branch block who required emergent HD and received jugular double-lumen CVC insertion, which was complicated by short-duration ventricular tachycardia followed by complete atrio-ventricular block and bradycardia. Pharmacological management did not reverse heart rate and rhythm. External pacing was not applied because she remained hemodynamically stable in the course of HD. Heart rate returned to sinus rhythm with left bundle branch block 4 hours later and did not recur through the whole admission period. We speculate that the transient arrhythmia might have been induced by mechanical contact with the ventricular wall during the procedure with the guided metallic wire. In conclusion, physicians responsible for CVC catheterization should pay more attention to patients with preexisting cardiac arrhythmia to prevent such technical mistakes from transpiring. PMID:23461759

Huang, Ya-Chin; Huang, Jiun-Chi; Chen, Szu-Chia; Chang, Jer-Ming; Chen, Hung-Chun

2013-10-01

159

An estimate of the methionine requirement and its variability in growing pigs using the indicator amino acid oxidation technique.  

PubMed

Although AA requirements for the mean of a population of growing pigs have been established using traditional methods, there are no estimates of the variability within the population and whether this variation differs among AA. With the increased use of supplemental Lys in pig diets, there will be an increased need to supplement Met, commonly the second or third limiting AA in corn-soybean diets. The indicator AA oxidation method allows repeated measurements in a short period of time so that the AA requirement can be determined for individual pigs at a similar physiological stage. The objective of this study was to determine the mean Met requirement in individual gilts and to estimate the related variability. Six individually housed female pigs (initial BW = 8.8 kg, SD 1.5) each received diets providing 6 levels of dl-Met. The isonitrogenous and isoenergetic diets contained 0.187, 0.250, 0.290, 0.320, 0.350, and 0.377% Met (analyzed, as-fed basis). Cysteine (0.48%) and Lys (1.44%) concentrations were similar for all diets. Pigs were adapted for 6 d to the basal corn-soybean meal diet (0.187% Met), which was offered at 95 g/kg(0.75) of BW to ensure complete consumption of the test diets. During 4-h oxidation studies, 313.4 kBq, (SD 35.6) of L-[1-(14)C]Phe was mixed with each of 8 half-hourly meals, and expired CO(2) was collected. The breakpoint in Phe oxidation, representing the Met requirement, and its variability, was determined using 2-phase linear regression. Phenylalanine oxidation decreased as the Met content increased from 0.187 to 0.29%. Phenylalanine oxidation was not different (P > 0.2) for diets ranging from 0.320 to 0.377% Met. The dietary Met requirement varied from 0.320 to 0.373% for individual pigs. The mean Met requirement for individual pigs was determined to be 0.340% of diet (SD = 0.024%, CV= 7.1%), with 0.340, 0.364, and 0.388% covering the requirement of 50, 66, and 95% of the population, respectively. The present mean population estimate was similar to the recommended dietary Met concentration of 0.325% for pigs of this BW and feed intake. To maximize profitability, Met levels in starter pig diets should be determined, depending on the cost of crystalline Met and the fraction of the population whose requirement is to be met. PMID:17940153

Moehn, S; Shoveller, A K; Rademacher, M; Ball, R O

2008-02-01

160

Endovascular treatment of an innominate artery iatrogenic pseudoaneurysm following subclavian vein catheterization.  

PubMed

Central venous catheterization is routinely required in a wide range of clinical situations such as hemodynamic monitoring, delivery of blood products and drugs, hemodialysis, total parental nutrition, and management of perioperative fluids. Pseudoaneurysms account for 4% of all innominate artery aneurysms. Clinical presentation may include airway and neurological compression, chest pain, mediastinal syndrome, upper limb ischemia, and hemodynamic instability. We report what we believe is the first documented case of a successful endovascular stent-graft repair of an innominate artery iatrogenic pseudoaneurysm. PMID:21193466

de Troia, Alessandro; Tecchio, Tiziano; Azzarone, Matteo; Biasi, Lukla; Piazza, Paolo; Franco Salcuni, Pier

2011-01-01

161

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

162

Single therapeutic catheterization for treatment of late diagnosed native coarctation of aorta using a covered stent.  

PubMed

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

2014-03-01

163

Acute Aortic Dissection Mimicking STEMI in the Catheterization Laboratory: Early Recognition Is Mandatory.  

PubMed

Coronary malperfusion due to type A aortic dissection is a life-threatening condition where timely recognition and treatment are mandatory. A 77-year-old woman underwent an acute evolving type A aortic dissection mimicking acute myocardial infarction. Two pathophysiologic mechanisms are discussed: either thrombosis migrating from a previously treated giant aneurism of proximal left anterior descending or a local arterial complication due to left main stenting. Recognition of these occurrences in the catheterization laboratory is important to look immediately for surgery. PMID:24826248

Arrivi, Alessio; Tanzilli, Gaetano; Puddu, Paolo Emilio; Truscelli, Giovanni; Dominici, Marcello; Mangieri, Enrico

2012-01-01

164

A Segmentation Algorithm for X-ray 3D Angiography and Vessel Catheterization  

SciTech Connect

Vessel Catheterization is a clinical procedure usually performed by a specialist by means of X-ray fluoroscopic guide with contrast-media. In the present paper, we present a simple and efficient algorithm for vessel segmentation which allows vessel separation and extraction from the background (noise and signal coming from other organs). This would reduce the number of projections (X-ray scans) to reconstruct a complete and accurate 3D vascular model and the radiological risk, in particular for the patient. In what follows, the algorithm is described and some preliminary experimental results are reported illustrating the behaviour of the proposed method.

Franchi, Danilo; Rosa, Luigi; Placidi, Giuseppe [Department of Science and Biomedical Technologies, University of L'Aquila, Via Vetoio 10, 67100 Coppito, L'Aquila (Italy)

2008-11-06

165

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

166

Risk of cancer associated with cardiac catheterization procedures during childhood: a cohort study in France  

PubMed Central

Background Radiation can be used effectively for diagnosis and medical treatment, but it can also cause cancers later on. Children with congenital heart disease frequently undergo cardiac catheterization procedures for diagnostic or treatment purposes. Despite the clear clinical benefit to the patient, the complexity of these procedures may result in high cumulative radiation exposure. Given children’s greater sensitivity to radiation and the longer life span during which radiation health effects can develop, an epidemiological cohort study is being launched in France to evaluate the risks of leukaemia and solid cancers in this specific population. Methods/design The study population will include all children who have undergone at least one cardiac catheterization procedure since 2000 and were under 10 years old and permanent residents of France at the time of the procedure. Electronically stored patient records from the departments of paediatric cardiology of the French national network for complex congenital heart diseases (M3C) are being searched to identify the children to be included. The minimum dataset will comprise: identification of the subject (file number in the centre or department, full name, sex, date and place of birth), and characteristics of the intervention (date, underlying disease, type of procedure, technical details, such as fluoroscopy time and dose area product, (DAP), which are needed to reconstruct the doses received by each child). The cohort will be followed up through linkage with the two French paediatric cancer registries, which have recorded all cases of childhood leukaemia and solid cancers in France since 1990 and 2000, respectively. Radiation exposure will be estimated retrospectively for each child. 4500 children with catherizations between 2000 and 2011 have been already included in the cohort, and recruitment is ongoing at the national level. The study is expected to finally include a total of 8000 children. Discussion This French cohort study is specifically designed to provide further knowledge about the potential cancer risks associated with paediatric cardiac catheterization procedures. It will also provide new information on typical dose levels associated with these procedures in France. Finally, it should help improve awareness of the importance of radiation protection in these procedures. PMID:23521893

2013-01-01

167

Immediate arterial hemostasis after cardiac catheterization: initial experience with a new puncture closure device.  

PubMed

A novel device for obtaining arterial hemostasis after invasive procedures was tested in 30 patients undergoing diagnostic catheterization (26 patients) or coronary angioplasty (4 patients). The device is deployed through an arterial sheath and forms a positive mechanical seal both inside and outside the defect in the arterial wall. The components are all bioabsorbable. Thirteen patients received a heparin bolus during the catheterization procedure. The activated clotting time recorded in 15 patients just prior to device deployment averaged 264 sec. 29 of 32 attempted device deployments were successful (91%); and the remaining 3 devices pulled completely out as called for by design in the event of incomplete deployment. Twenty-nine patients ultimately achieved successful hemostasis using the device, with the other patient receiving manual hemostasis. Of these 29, hemostasis was immediate and complete in 19 patients. Light digital pressure was required in another 8 patients for less than 5 min. There was minor delayed bleeding requiring supplemental light pressure in several cases. A total of 11 patients required supplemental pressure in addition to the hemostasis device. The use of bolus heparin was significantly (P = 0.05, Fisher's exact test) related to the requirement for supplemental pressure. Three patients developed hematomas, one of which was present prior to device deployment. The other two patients had received bolus heparin. No patient required transfusion or surgical repair. There was no change in the ankle/brachial systolic blood pressure index after device deployment or at late (30-60 day) follow-up. Ultrasound studies revealed no significant pathology relative to the device.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:8025942

Aker, U T; Kensey, K R; Heuser, R R; Sandza, J G; Kussmaul, W G

1994-03-01

168

Frequency and Predictors of Renal Artery Stenosis in Patients Undergoing Simultaneous Coronary and Renal Catheterization  

PubMed Central

Background Atherosclerotic renal artery stenosis (ARAS) remains underdiagnosed due to its nonspecific demonstrations. We aimed to both estimate the frequency of ARAS in high-risk non-selected patients undergoing simultaneous coronary and renal catheterization and possibly identify a predictive model for ARAS using baseline clinical, laboratory, and coronary angiographic variables. Methods: The records of 866 patients aged ? 21 years undergoing simultaneous coronary and renal angiography were retrieved for analysis from our computerized database. The degree of ARAS was estimated visually by experienced attending interventional cardiologists. Lesions with an estimated stenosis of ? 50% were considered significant. Multivariable stepwise logistic regression models were used to identify the risk factors predicting the presence and extent of ARAS. Results: Of a total of 866 consecutive patients undergoing renal angiography in conjunction with coronary angiography (mean age ± SD: 63.06 ± 10.32, ranging from 24 to 89 years), 454 (57%) were men. A total of 345 (39.8%) cases had significant ARAS, 77 (22.3%) of which were bilateral. Using significant ARAS as the dependent variable, six variables were identified as the independent predictors significantly associated with the presence of ARAS, namely age, female sex (male sex was found to be a protector), hypertension, history of renal failure, left anterior descending artery (LAD) stenosis > 50%, and left circumflex artery (LCX) stenosis > 50%. The Gensini score was not found to be a predictor of the presence of ARAS, but it was more likely associated with a trend towards a more extensive ARAS (adjusted OR = 1.00, 95% CI = 1.00–1.01; p value = 0.039). Other independent determinants of the ARAS extent were the same as the predictors of the ARAS presence. Conclusion: Although risk versus benefit was not tested in this study, it seems that clinicians could consider renal catheterization in combination with coronary angiography particularly in female patients with advanced age and with significant coronary artery stenoses in the LAD and LCX. PMID:23074639

Rokni, Navid; Salarifar, Mojtaba; Hakki Kazazi, Elham; Goodarzynejad, Hamidreza

2012-01-01

169

Influence of the timing of cardiac catheterization and the amount of contrast media on acute renal failure after cardiac surgery.  

PubMed

Postoperative acute renal failure (ARF) is not uncommon after cardiac surgery and after angiography. However, limited information exists regarding the influence of the interval between cardiac catheterization and subsequent cardiac surgery and amount of contrast agent used during this procedure on the occurrence of postoperative ARF. Data for 423 consecutive adult patients who underwent elective cardiac surgery after cardiac catheterization were examined retrospectively. The influence of interval between cardiac catheterization and cardiac surgery on postoperative ARF (defined as postoperative serum creatinine > or =2 times baseline and >2 mg/dl and/or need for renal replacement therapy) was evaluated using multivariable logistic regression. ARF occurred in 24 patients (5.7%). Median time to angiography was 2 days (interquartile range 1 to 4.5), and median dose of contrast used was 1.36 ml/kg (interquartile range 1.12 to 1.69). Surgery on the day of cardiac catheterization was independently associated with increased risk of ARF (adjusted odds ratio 3.1, 95% confidence interval 1.1 to 8.8). This risk of ARF was highest in patients who underwent surgery on the same day as angiography and with a dose of contrast higher than median (14.6%) and lowest when surgery was delayed beyond 1 day of angiography and contrast dose was median or less (2.4%; adjusted odds ratio for same-day surgery and dose higher than median 4.2, 95% confidence interval 1.2 to 14.2). Cardiac surgery performed on the day of cardiac catheterization and higher dose of contrast agent used were both independently associated with increased risk of postoperative ARF. In conclusion, these findings suggest that delaying cardiac surgery beyond 24 hours of exposure to contrast agents (when feasible) and minimizing the use of these agents have significant potential to decrease the incidence of postoperative ARF in patients undergoing elective cardiac surgery. PMID:18394443

Ranucci, Marco; Ballotta, Andrea; Kunkl, Alessia; De Benedetti, Donatella; Kandil, Hassan; Conti, Daniela; Mollichelli, Nadia; Bossone, Eduardo; Mehta, Rajendra H

2008-04-15

170

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

171

Radiotelemetry Catheter Implantation: Surgical Technique and Results in Cats  

Microsoft Academic Search

34 Arterial blood pressure can be measured in cats by direct and indirect techniques. Direct arterial measurement, requiring puncture or catheterization of an artery, is ideal but has several limitations. The patient often requires sedation or anesthesia for initial instrumentation, and restriction of animal movement is necessary to prevent dislodgment of the catheter and attached equipment during monitoring. Although systemic

RITA H. MILLER; DANIEL D. SMEAK; LINDA B. LEHMKUHL; SCOTT A. BROWN; STEPHEN P. DIBARTOLA

2000-01-01

172

A rare case of iatrogenic pseudoaneurysm of the left brachiocephalic vein after central venous catheterization treated with thrombin injection.  

PubMed

Rupture of the central veins with venous pseudoaneurysm formation is an unusual complication of central venous catheterization. Only seven cases of brachiocephalic venous pseudoaneurysm have been reported in the literature (among these only one was secondary to central venous catheterization). Plain radiographic examination of the chest may show widening of the mediastinum, pleural effusion (haemothorax), and/or opacity overlying the hemithorax of the injured vein. Further evaluation using either computed tomography or magnetic resonance imaging can be performed. Venography is considered an important tool, especially when an intervention is planned. We present the first reported case of brachiocephalic vein pseudoaneurysm treated solely with thrombin injection. The imaging, other treatment options, and literature review of brachiocephalic venous pseudoaneurysm are also discussed. PMID:24042960

Elsaadany, Amr Maged; Alaeddin, Fida Hasan; Alsuhaibani, Hamad Abdulla

2014-08-01

173

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

174

Clinical Application of Cine-MRI in the Visual Assessment of Mitral Regurgitation Compared to Echocardiography and Cardiac Catheterization  

PubMed Central

Background Detecting and quantifying the severity of mitral regurgitation is essential for risk stratification and clinical decision-making regarding timing of surgery. Our objective was to assess specific visual parameters by cine-magnetic resonance imaging (MRI) in the determination of the severity of mitral regurgitation and to compare it to previously validated imaging modalities: echocardiography and cardiac ventriculography. Methods The study population consisted of 68 patients who underwent a cardiac MRI followed by an echocardiogram within a median time of 2.0 days and 49 of these patients who had a cardiac catheterization, median time of 2.0 days. The inter-rater agreement statistic (Kappa) was used to evaluate the agreement. Results There was moderate agreement between cine MRI and Doppler echocardiography in assessing mitral regurgitation severity, with a kappa value of 0.47, confidence interval (CI) 0.29–0.65. There was also fair agreement between cine MRI and cardiac catheterization with a kappa value of 0.36, CI of 0.17–0.55. Conclusion Cine MRI offers a reasonable alternative to both Doppler echocardiography and, to a lesser extent, cardiac catheterization for visually assessing the severity of mitral regurgitation with specific visual parameters during routine clinical cardiac MRI. PMID:22815751

Heitner, John; Bhumireddy, Geetha P.; Crowley, Anna Lisa; Weinsaft, Jonathan; Haq, Salman A.; Klem, Igor; Kim, Raymond J.; Jollis, James G.

2012-01-01

175

Comparing the cost-effectiveness of simulation modalities: a case study of peripheral intravenous catheterization training.  

PubMed

While the ultimate goal of simulation training is to enhance learning, cost-effectiveness is a critical factor. Research that compares simulation training in terms of educational- and cost-effectiveness will lead to better-informed curricular decisions. Using previously published data we conducted a cost-effectiveness analysis of three simulation-based programs. Medical students (n = 15 per group) practiced in one of three 2-h intravenous catheterization skills training programs: low-fidelity (virtual reality), high-fidelity (mannequin), or progressive (consisting of virtual reality, task trainer, and mannequin simulator). One week later, all performed a transfer test on a hybrid simulation (standardized patient with a task trainer). We used a net benefit regression model to identify the most cost-effective training program via paired comparisons. We also created a cost-effectiveness acceptability curve to visually represent the probability that one program is more cost-effective when compared to its comparator at various 'willingness-to-pay' values. We conducted separate analyses for implementation and total costs. The results showed that the progressive program had the highest total cost (p < 0.001) whereas the high-fidelity program had the highest implementation cost (p < 0.001). While the most cost-effective program depended on the decision makers' willingness-to-pay value, the progressive training program was generally most educationally- and cost-effective. Our analyses suggest that a progressive program that strategically combines simulation modalities provides a cost-effective solution. More generally, we have introduced how a cost-effectiveness analysis may be applied to simulation training; a method that medical educators may use to investment decisions (e.g., purchasing cost-effective and educationally sound simulators). PMID:23728476

Isaranuwatchai, Wanrudee; Brydges, Ryan; Carnahan, Heather; Backstein, David; Dubrowski, Adam

2014-05-01

176

Management of arterial puncture site after catheterization procedures: evaluating a suture-mediated closure device.  

PubMed

To overcome the challenge associated with achievement in hemostasis after a catheterization procedure, a suture-based closure device was compared with manual compression in a 600-patient randomized trial. The major study end points included the incidence of vascular complications and the time to ambulation after the procedure. The study included diagnostic or interventional procedures. The suture-mediated closure was performed immediately after the procedure independent of the anticoagulation level, whereas manual compression was performed per hospital protocol with sheath removal relying on normalization of patient's anticoagulation status. A significant reduction in time to achieve hemostasis (7.8 +/- 4.8 vs 19.6 +/- 13.2 minutes, p <0001) and time to ambulation (4.5 +/- 6.5 vs 17.8 +/- 5 hours, p <0001) was associated with use of the suture-mediated closure device. The incidence of vascular complications was similar in the overall population (5.7% for suturing device vs 11.3% for compression) or in the interventional patient subset (8.4% for suturing device vs 9.6% for compression). There was a significant reduction in the incidence of vascular complications in the diagnostic procedure subset (4.4% for suturing device vs 12.1% for compression, p <0.05). Thus, the use of a suture-mediated closure device represents a safe alternative to manual compression. Hemostasis and ambulation can be achieved faster with the suturing device than with manual compression, with a potential reduction in access site complications. PMID:10392872

Gerckens, U; Cattelaens, N; Lampe, E G; Grube, E

1999-06-15

177

Further fMRI validation of the visual half field technique as an indicator of language laterality: A large-group analysis  

Microsoft Academic Search

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 replace the invasive Wada-test. We evaluated the usefulness of behavioral visual half

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

2011-01-01

178

Development of a Projective Technique for Obtaining Educationally Useful Information Indicating Pupils' Attituded Toward Work and Occupational Plans. Report No. 21. Final Report.  

ERIC Educational Resources Information Center

The purpose of this study was to develop a projective technique which would (1) identify youths' attitudes toward certain distributive, construction, service, and agricultural occupation, and (2) identify factors associated with occupational aspirations. Interviews were conducted with 88 Caucasian and Negro Job Corps enrollees and 91 Caucasian and…

Olsen, LeRoy C.; Venema, William H.

179

[Radiation exposure of health personnel and patients in the heart catheterization laboratory in during vascular brachytherapy].  

PubMed

Interventional radiological measures can lead to high radiation exposures for medical staff. In order to determine the radiation exposure to staff and patients, the resulting radiation exposures were directly measured for 52 measures at an cardiac catheterization laboratory with a new dosimetry system DIS (Direct Ion Storage). Beside the measurement of body dose behind the lead apron, measurements of radiation doses were performed in front of the lead apron and at the wrist of the physician. These measurements were taken as an approximation of the radiation exposure of the non-shielded body parts. The patients dose was estimated by placing a dosemeter close to the head of the patient and from the dose-area product. The mean value of body dose from 52 measurements for the physician behind the lead apron was 1.9 microSv per procedure with a range of 0-9 microSv. In front of the lead apron, a mean value of 53.9 microSv (3-233 microSv) per procedure was obtained. The mean value of partial body dose at the physician's wrist was determined to be 163.2 microSv (12-603 microSv) per procedure. It could be shown that measures combined with interventions lead to higher exposures compared with measures without interventions. For the medical technician, the mean value behind the lead apron was 3.9 microSv (0-58 microSv) per procedure. For the patient, a mean value of 800 microSv (119-8642 microSv) was measured close to the head. The mean dose to the skin of the patient at radiation entrance was determined to be 307 mGy (70-1190 mGy). From this data, the radiation dose per year for the physician performing 1000 measures, was determined to be 1.9 mSv/year. This is below the new dose limit of 20 mSv/year. Also the estimations for the dose to the eye lens and the hands of the physician show no conflicts with actual dose limits when obeying all radiation regulations. The results for vascular brachytherapy did not show significantly higher exposures, compared with conventional measures including interventions. PMID:12219698

Folkerts, K H; Franz, A; Kiefer, A; Hennersdorf, G

2002-06-01

180

State-of-the-art treatment alternatives for base of skull meningiomas: complementing and controversial indications for neurosurgery, stereotactic and robotic based radiosurgery or modern fractionated radiation techniques  

PubMed Central

For skull base meningiomas, several treatment paradigms are available: Observation with serial imaging, surgical resection, stereotactic radiosurgery, radiation therapy or some combination of both. The choice depends on several factors. In this review we evaluate different treatment options, the outcome of modern irradiation techniques as well as the clinical results available, and establish recommendations for the treatment of patients with skull-base meningiomas. PMID:23273161

2012-01-01

181

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.

182

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

183

Underestimation of prosthetic mitral valve areas: role of transseptal catheterization in avoiding unnecessary repeat mitral valve surgery.  

PubMed

In patients with symptoms of heart failure after mitral valve replacement, identification of a stenosed prosthesis may be difficult. Twelve such patients were evaluated, presenting at a mean of 8.4 years after mitral valve replacement (four mechanical, eight porcine). Transvalvular pressure gradients were obtained using both indirect (pulmonary capillary wedge) and direct (transseptal catheterization) measurements of left atrial pressure. In all 12 patients, the diastolic gradient across the prosthetic valve was overestimated when pulmonary wedge rather than transseptal measurements were used. Calculated mitral valve prosthetic area was underestimated by the pulmonary wedge determinations. These findings may be caused by either the phase delay of the pulmonary wedge V wave relative to the transseptal V wave, resulting in a higher diastolic mean left atrial pressure, or the faulty wedge determinations in the setting of pulmonary hypertension, or both. In patients being considered for repeat mitral valve replacement because of prosthetic valve stenosis, transseptal catheterization allows for more accurate determination of prosthetic valve area and more accurately defines the need for repeat mitral valve surgery. PMID:3998319

Schoenfeld, M H; Palacios, I F; Hutter, A M; Jacoby, S S; Block, P C

1985-06-01

184

A Simple Technique to Facilitate Treatment of Urethral Strictures with Optical Internal Urethrotomy  

PubMed Central

Urethral stricture is a common condition that can lead to serious complications such as urinary infections and renal insufficiency secondary to urinary retention. Treatment options include catheterization, urethroplasty, endoscopic internal urethrotomy, and dilation. Optical internal urethrotomy offers faster recovery, minimal scarring, and less risk of infection, although recurrence is possible. However, technical difficulties associated with poor visualization of the stenosis or of the urethral lumen may increase procedural time and substantially increase the failure rates of internal urethrotomy. In this report we describe a technique for urethral catheterization via a suprapubic, percutaneous approach through the urinary bladder in order to facilitate endoscopic internal urethrotomy.

Stamatiou, Konstantinos; Papadatou, Aggeliki; Kornezos, Ioannis; Pavlis, Anargiros

2014-01-01

185

Reducing the burden of regular indwelling urinary catheter changes in the catheter clinics: the opinion of patients and relatives on the practice of self-catheterization  

PubMed Central

Background Clean intermittent self-catheterization is accepted worldwide as a standard of care for patients with long-standing need for urinary bladder decompression. Evidence of its routine practice in our low-resource setting is lacking, leading to increasing number of patients with a long-standing indwelling urinary catheter. Objective To seek the opinion of patients already using indwelling catheters regarding the practice of self-catheterization. Patients and methods Over a 4-month period, the opinion of every patient and patient’s relative that attended the regular urinary catheter clinic was sought using an intern-administered questionnaire. The data was analyzed using SPSS version 20. Results A total of 108 patients completed the questionnaire. Age range was 16–100 years with a mean of 62.2±15.5 years. Only 30.5% of the patients had formal education beyond the primary level. The median cost for change of the indwelling catheter was 1,325 naira ($8.28 US) with a range of 500–4,000 naira ($3.13–$25 USD). Analysis showed that: 70.8% of patients aged under 60 years/60.6% of those with formal education beyond primary level/61.9% of those wearing catheters for <3 months would give consent for training in self-catheterization. Higher cost of catheter change did not influence the decision to consider self-catheterization. Of the 59 patient relatives who completed the questionnaire, 63% of those younger than 50 years old and 69.2% of those with tertiary education would be willing to undertake training to administer self-catheterization. Conclusion A select group of patients and accompanying relatives in our low-resource setting are willing to learn and practice self-catheterization.

Nnabugwu, Ikenna I; Udeh, Emeka I; Enivwenae, Oghenekaro A; Ugwumba, Fred O; Ozoemena, Oyiogu F

2014-01-01

186

Direct indication of lateral nonuniformities of MOS capacitors from the negative equivalent interface trap density based on charge-temperature technique  

NASA Astrophysics Data System (ADS)

The charge-temperature technique was used to investigate the oxide properties of silicon MOS capacitors fabricated on a wafer with an oxide thickness of 660 Å. The stretchout of high frequency C — V curve of the capacitor after a positive charge-temperature aging was proved to be due to the lateral nonuniformities of mobile charges and the increase of interface traps. The effect of lateral nonuniformitites was found to be successfully described by a model consisting of two parallelly connected nonuniform capacitors. The only parameter of importance is their area ratio, which can be easily determined by theoretical fitting. The appearance of a negative equivalent interface trap density was proposed as a new method to directly identify the existence of lateral nonuniformities.

Hwu, J. G.; Wang, W. S.

1986-05-01

187

Double wire technique for stenting tortuous cerebral vessels.  

PubMed

The failure to catheterize distal vessels may preclude optimal endovascular intervention. We present a double wire technique to facilitate the selective placement of catheters into tortuous vasculature when a single wire and catheter technique does not suffice. A wide necked middle cerebral artery (MCA) aneurysm incorporated the origin of the inferior MCA trunk, and despite successful passage of a wire into the distal MCA, the catheter could not be advanced beyond 2 sharp turns at the inferior trunk origin. A second wire was passed through the catheter into the inferior trunk providing adequate stability for advancement of the catheter into the vessel. The distal vessel was successfully catheterized and a stent was placed without complication. The double wire technique may allow the passage of catheters into vessels that are otherwise inaccessible because of tortuosity. PMID:21767965

Lopes, Demetrius Klee; Johnson, Andrew Kelly; Schreiner, Cristian Ariel

2012-11-01

188

Turn indicator  

NASA Technical Reports Server (NTRS)

This report presents a study of an instrument that can warn the pilot of the turning of his airplane. This instrument must satisfy three conditions: 1) It must give useful indication immediately from take-off; 2) The indications must be instantaneous and require no exertion by the pilot; 3) The indicator must be sensitive only to changes of orientation in the horizontal plane. Different solutions are presented such as a gyroscope driven by the suction of a Venturi tube.

De Guiche, A De Gramont

1922-01-01

189

Community indicators  

PubMed Central

Community indicators are used to assess the impact of alcohol on communities. This article reviews the main data sources for community indicators, discusses their strengths and limitations, and discusses indicators used in reference to four main topics relating to alcohol use and problems at the community level: alcohol use, patterns, and problems; alcohol availability; alcohol-related health outcomes/trauma; and alcohol-related crime and enforcement. It also reviews the challenges associated with collecting community indicator data, along with important innovations in the field that have contributed to better knowledge of how to collect and analyze community-level data on the impact of alcohol. PMID:24881322

Flynn, Andrea; Wells, Samantha

2014-01-01

190

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

191

Oxidation states of iron as an indicator of the techniques used to burn clays and handcraft archaeological Tupiguarani ceramics by ancient human groups in Minas Gerais, Brazil  

NASA Astrophysics Data System (ADS)

Ceramics of the Tupiguarani Tradition typically have in common the burning characteristics, their forms and decoration motifs. Dating such ceramic pieces with the radiocarbon method indicate that these artifacts were probably handcrafted between 1,500 and 500 years before the present. Fragments ceramic utensils were collected in the archaeological site of Beltrão, in the municipality of Corinto, state of Minas Gerais, Brazil. A fragment of about 50 mm in diameter and 15 mm thick, with a color gradation across the ceramic wall ranging from red, on one side, grayish, in the middle, and orange, on the opposite side, was selected for a more detailed examination. The fragment was transversely cut and a series of subsamples were separated from different points along the piece wall, in layer segments of ~3 mm. All subsamples were analyzed with Mössbauer spectroscopy at room temperature and 80 K. Results reveal that hematite is the magnetically ordered phase. A Fe2 + component (relative spectral area, 50 %) appears for the grayish subsample. According to these first results, the red subsample seems to be the side that had direct contact with fire used to burn the precursor clay in air. The grayish middle layer is probably due to the clay mixed with some ashes. Mössbauer data reveal that the orange layer, corresponding to the opposite side of the ceramic relatively to the direct fire, does contain about the same Fe2 + :Fe3 + ratio but much lower proportion of ?-Fe2O3 than the red layer.

Floresta, D. L.; Ardisson, J. D.; Fagundes, M.; Fabris, J. D.; Macedo, W. A. A.

2014-01-01

192

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

193

The Effect of Simulation Teaching on Baccalaureate Nursing Students' Self-confidence Related to Peripheral Venous Catheterization in Children: A Randomized Trial  

PubMed Central

Introduction: In recent decades, nursing instructors have tended to use simulation rather than traditional methods due to benefits such as increased self-confidence. However, little academic literature is available to verify this claim. The procedure of establishing peripheral venous catheterization in pediatric patients is of great importance. Therefore, the researchers attempted to review the effect of the simulation teaching method on nursing students' self-confidence related to peripheral venous catheterization in pediatric patients. Methods: In this trial, 45 students in the 5th and 6th semester of nursing school in the first half of school year 2012 from the Faculty of Nursing and Midwifery, Tabriz University of Medical Sciences, Iran, were randomly assigned to three groups (a control group, and two intervention groups). They were trained in establishing peripheral venous catheterization in pediatric patients through simulation teaching method and practical training. The students' self-confidence was assessed by C-Scale before and after the intervention. Results: The students' self-confidence score showed a significant increase in the simulation group after the intervention in comparison to other groups (p = 0.03). Conclusion: Results revealed a significant increase in self-confidence of nursing students related to peripheral venous catheterization in pediatric patients by simulation. This substantiates the assertion that simulation can improve self-confidence. Due to the low sample size, further studies with larger population are suggested.

Valizadeh, Leila; Amini, Abolghasem; Fathi-Azar, Eskandar; Ghiasvandian, Shahrzad; Akbarzadeh, Bahareh

2013-01-01

194

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

195

Engagement Indicators Theme Engagement Indicator  

E-print Network

in magnitude. Due to their positive associations with student learning and retention, special undergraduateSnapshot Engagement Indicators Theme Engagement Indicator Higher-Order Learning (HO) Reflective) Discussions with Diverse Others (DD) -- Student-Faculty Interaction (SF) Effective Teaching Practices (ET

Bogaerts, Steven

196

Screening & profiling of quorum sensing signal molecules in Pseudomonas aeruginosa isolates from catheterized urinary tract infection patients  

PubMed Central

Background & objectives: Catheter associated urinary tract infections are the second most common nosocomial infections and Pseudomonas aeruginosa is the third most common organism responsible for these infections. In this study P. aeruginosa isolates from catheterized urinary tract infection patients were screened and profiled for the presence of different type of quorum sensing (QS) signal molecules. Methods: Screening and quantitation of AHLs was done by using cross feeding assay and by determining ?-galactosidase activity respectively using Escherichia coli MG4 as reporter strain. Further, AHL profiles were determined by separating AHLs on TLC coupled with their detection using Chromobacterium violaceum CV026 and Agrobacterium tumifaciens A136 biosensor strains. Results: All uroisolates from catheterized patients having urinary tract infections were found to be producers of QS signal molecules. There were differences in amounts and type of AHL produced amongst uroisolates of P. aeruginosa. Several AHLs belonging to C4-HSL, C6-HSL, oxo-C6-HSL, C8-HSL, C10-HSL and C12-HSL were determined in these strains. Interpretation & conclusions: Simultaneous use of more than one reporter strain and assay method proved useful in determining the AHLs profile in uroisolates of P. aeruginosa. Observed differences in the amounts and types of AHLs may reflect differences in virulence potential of P. aeruginosa to cause UTIs which can be further confirmed by employing animal model system. The present study speculates that production of QS signal molecules may act as a new virulence marker of P. aeruginosa responsible for causing catheter associated UTIs and can be considered as futuristic potential drug targets towards treatment of UTIs. PMID:21911974

Kumar, Ravi; Chhibber, Sanjay; Gupta, Varsha; Harjai, Kusum

2011-01-01

197

ACCF/SCAI/AATS/AHA/ASE/ASNC/HFSA/HRS/SCCM/SCCT/SCMR/STS 2012 appropriate use criteria for diagnostic catheterization: a report of the American College of Cardiology Foundation Appropriate Use Criteria Task Force, Society for Cardiovascular Angiography and Interventions, American Association for Thoracic Surgery, American Heart Association, American Society of Echocardiography, American Society of Nuclear Cardiology, Heart Failure Society of America, Heart Rhythm Society, Society of Critical Care Medicine, Society of Cardiovascular Computed Tomography, Society for Cardiovascular Magnetic Resonance, and Society of Thoracic Surgeons.  

PubMed

The American College of Cardiology Foundation, in collaboration with the Society for Cardiovascular Angiography and Interventions and key specialty and subspecialty societies, conducted a review of common clinical scenarios where diagnostic catheterization is frequently considered. The indications (clinical scenarios) were derived from common applications or anticipated uses, as well as from current clinical practice guidelines and results of studies examining the implementation of noninvasive imaging appropriate use criteria. The 166 indications in this document were developed by a diverse writing group and scored by a separate independent technical panel on a scale of 1 to 9, to designate appropriate use (median 7 to 9), uncertain use (median 4 to 6), and inappropriate use (median 1 to 3). Diagnostic catheterization may include several different procedure components. The indications developed focused primarily on 2 aspects of diagnostic catheterization. Many indications focused on the performance of coronary angiography for the detection of coronary artery disease with other procedure components (e.g., hemodynamic measurements, ventriculography) at the discretion of the operator. The majority of the remaining indications focused on hemodynamic measurements to evaluate valvular heart disease, pulmonary hypertension, cardiomyopathy, and other conditions, with the use of coronary angiography at the discretion of the operator. Seventy-five indications were rated as appropriate, 49 were rated as uncertain, and 42 were rated as inappropriate. The appropriate use criteria for diagnostic catheterization have the potential to impact physician decision making, healthcare delivery, and reimbursement policy. Furthermore, recognition of uncertain clinical scenarios facilitates identification of areas that would benefit from future research. PMID:22578925

Patel, Manesh R; Bailey, Steven R; Bonow, Robert O; Chambers, Charles E; Chan, Paul S; Dehmer, Gregory J; Kirtane, Ajay J; Wann, L Samuel; Ward, R Parker

2012-05-29

198

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

199

Superiority of quantitative exercise thallium-201 variables in determining long-term prognosis in ambulatory patients with chest pain: a comparison with cardiac catheterization  

SciTech Connect

The purpose of this study was to determine the prognostic utility of quantitative exercise thallium-201 imaging and compare it with that of cardiac catheterization in ambulatory patients. Accordingly, long-term (4 to 9 years) follow-up was obtained in 293 patients who underwent both tests for the evaluation of chest pain: 89 had undergone coronary artery bypass graft surgery within 3 months of testing and were excluded from analysis, 119 experienced no cardiac events and 91 had an event (death in 20, nonfatal myocardial infarction in 21 and coronary artery bypass operations performed greater than 3 months after cardiac catheterization in 50). When all variables were analyzed using Cox regression analysis, the quantitatively assessed lung/heart ratio of thallium-201 activity was the most important predictor of a future cardiac event (chi 2 = 40.21). Other significant predictors were the number of diseased vessels (chi 2 = 17.11), patient gender (chi 2 = 9.43) and change in heart rate from rest to exercise (chi 2 = 4.19). Whereas the number of diseased vessels was an important independent predictor of cardiac events, it did not add significantly to the overall ability of the exercise thallium-201 test to predict events. Furthermore, information obtained from thallium-201 imaging alone was marginally superior to that obtained from cardiac catheterization alone (p = 0.04) and significantly superior to that obtained from exercise testing alone (p = 0.02) in determining the occurrence of events. In addition, unlike the exercise thallium-201 test, which could predict the occurrence of all categories of events, catheterization data were not able to predict the occurrence of nonfatal myocardial infarction. The exclusion of bypass surgery and previous myocardial infarction did not alter the results.

Kaul, S.; Finkelstein, D.M.; Homma, S.; Leavitt, M.; Okada, R.D.; Boucher, C.A.

1988-07-01

200

Reconstruction of stenotic or occluded iliofemoral veins and inferior vena cava using intravascular stents: re-establishing access for future cardiac catheterization and cardiac surgery  

Microsoft Academic Search

OBJECTIVESThe study evaluated the safety and efficacy of stent reconstruction of stenotic\\/occluded iliofemoral veins (IFV) and inferior vena cava (IVC).BACKGROUNDPatients with congenital heart defects and stenotic or occluded IFV\\/IVC may encounter femoral venous access problems during future cardiac surgeries or catheterizations.METHODSTwenty-four patients (median age 4.9 years) underwent implantation of 85 stents in 22 IFV and 6 IVC. Fifteen vessels were

Frank F Ing; Thomas E Fagan; Ronald G Grifka; Sandra Clapp; Michael R Nihill; Mark Cocalis; James Perry; James Mathewson; Charles E Mullins

2001-01-01

201

Improved semen collection method for wild felids: urethral catheterization yields high sperm quality in African lions (Panthera leo).  

PubMed

For wild and domestic felids, electroejaculation (EE) is the most common semen collection method. However, the equipment is expensive, there is a risk of urine contamination and animals usually show strong muscular contraction despite general anesthesia. Accordingly, we tested the feasibility of a different approach using urethral catheterization (UC) in seven African lions, previously described for domestic cats only. After general anesthesia with the ?2-agonist medetomidine (which also stimulates semen release into the urethra) and ketamine, a transrectal ultrasound was performed to locate the prostate. A commercial dog urinary catheter (2.6 or 3.3 mm in diameter) was advanced approximately 30 cm into the urethra to allow semen collection into the lumen of the catheter by capillary forces. After retraction, sperm volumes between of 422.86 ± 296.07 ?l yielded motility of 88.83 ± 13.27% (mean ± SD) with a mean sperm concentration of 1.94 × 10(9)/ml. Here we describe a simple, field friendly and effective method to attain highly concentrated semen samples with excellent motility in lions and potentially other wild felid species as an alternative to electroejaculation. PMID:22538007

Lueders, I; Luther, I; Scheepers, G; van der Horst, G

2012-08-01

202

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

203

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

204

Medical iPad use in the cardiac catheterization and echo laboratories.  

PubMed

The present study aims to describe a dedicated cardiac imaging application on a tablet and to assess the accuracy and reproducibility of this novel application for measurement on angiography and echocardiography data sets. Tablet devices have recently been used in radiological image interpretation and enable transfer of images. It allows the clinician to look up clinical information, search the Internet and communicate with colleagues and family. The study group consisted of 30 patients who had both echocardiographic and angiographic examinations. For each patient, a few measurements (i.e. length, area and angle) were performed using the iPad, and compared to the McKesson workstation, which is routinely used in the hospital. In order to show the equivalence between these two methods, a linear regression was fitted and the distribution of differences between measurements was examined. In addition, the variability of the measurements was compared between two different reviewers (inter-observer test) and between the measurements of the same reviewer at two different time settings (intra-observer test) by calculating the intraclass correlation coefficient (ICC). In all comparisons, the linear regression showed high correlation coefficient (r > 0.9), and the distribution of differences was around zero, implying that the two methods lead to equivalent results. The absolute mean difference between the two different observers demonstrated high agreement between the two observers' repeated measurements. The same conclusions can be deduced from the same observer's repeated measurements. The ICC indicates the resemblance between the two sets, and could be considered almost perfect (ICC > 0.968 for all cases). The newly developed cardiology iPad application offers the opportunity to accurately present the cardiac procedure in a visual, clear and professional manner. PMID:24337922

Lavi, Ifat; Malki, Guy; Kornowski, Ran

2014-02-01

205

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

206

Visualization of coronary arteries in patients after childhood Kawasaki syndrome: value of multidetector CT and MR imaging in comparison to conventional coronary catheterization  

Microsoft Academic Search

Background  After childhood Kawasaki syndrome (KS) the coronary arteries undergo a lifelong dynamic pathological change, and follow-up\\u000a coronary artery imaging is essential. At present, conventional coronary catheterization (CCC) and angiography is still regarded\\u000a as the gold standard. Less-invasive methods such as multidetector CT angiography (MDCT-A) and MRI have been used sporadically.\\u000a \\u000a \\u000a \\u000a Objective  To compare the diagnostic quality of MDCT-A and MRI with

Raoul Arnold; Sebastian Ley; Julia Ley-Zaporozhan; Joachim Eichhorn; Jens-Peter Schenk; Herbert Ulmer; Hans-Ulrich Kauczor

2007-01-01

207

Self catheterization - female  

MedlinePLUS

... catheter: Wash your hands well with soap and water. Collect your supplies: catheter (open and ready to use), towelette or ... the middle, and on both sides. Use a fresh antiseptic towelette or ... with mild soap and water. Rinse well and dry if you use soap ...

208

Self catheterization - male  

MedlinePLUS

... catheter: Wash your hands well with soap and water. Collect your supplies, including your catheter (open and ready to be ... hands well. Rinse out the catheter with a solution of 1 part white vinegar and 4 parts water. Or, you can soak it in hydrogen peroxide ...

209

Right atrial pressure alterations during echocardiography-guided-catheterization predict tricuspid valvular impairment: a novel method for the creation of a rabbit model of Staphylococcus aureus endocarditis  

PubMed Central

Background We previously reported the use of a catheter system to damage the tricuspid valve and create infectious endocarditis (IE) in an animal model. The current study aims to create a faint IE model suitable for antibiotic prophylaxis using a low bacterial inoculum. We also aim to explore a way to quantitatively assess valvular impairment and to predict the success of the IE models during catheterization. Methods Ninety rabbits were assigned to two groups according to the density of bacteria inoculated (1?×?105 CFU for Group A and 1?×?104 CFU for Group B). A catheter system consisting of a polyethylene catheter and a guide wire were used to damage the valve. The catheter system was passed through the rabbits’ tricuspid valves under echocardiographic guidance. A pressure transducer was used to assess right atrial pressure (PRA) before and just after valvular damage to calculate the pressure alterations (?PRA). The animals in group A and B were divided into 3 subgroups according to the ?PRA (0–5 mmHg for Groups A1 and B1; 5–10 mmHg for Groups A2 and B2; 10–15 mmHg for Groups A3 and B3). Staphylococcus aureus (ATCC 29213) inoculation was performed 24 hr after cardiac catheterization. Results Faint IE was confirmed in 20%, 93.3%, 26.7%, 6.7%, 20%, and 33.3% of the rabbits in Groups A1, A2, A3, B1, B2, and B3, respectively. There was no difference in the LV/RV ratio and VTR of the No-IE, faint-IE, and severe IE animals. Faint IE rabbits had a larger ?PRA than No-IE rabbits (7.81?±?1.21 vs. 2.48?±?1.0, P?catheterization and inoculating of an appropriate dose of bacteria was associated with a successful IE model. PMID:24950856

2014-01-01

210

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

211

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.

212

Right ventricle functional assessment: have new techniques supplanted the old faithful conductance catheter?  

PubMed

This review explores the historical development of conductance catheterization of the human right ventricle (RV) and its current diagnostic role in assessing RV function in an era of contemporary noninvasive imaging. Significant advances in echocardiography, cardiothoracic computed tomography, and cardiac magnetic resonance in the last decade have led a paradigm shift away from invasive hemodynamic assessment toward noninvasive measurement of RV function. However, imaging modalities are not without some disadvantages. For example, they do not provide the beat-to-beat pressure-volume assessment that is obtained by conductance catheterization, which is still arguably the gold standard for measuring cardiac performance. Right heart catheterization remains an integral part of the assessment of patients with RV dysfunction, and a burgeoning interest in early RV insufficiency in a range of cardiopulmonary diseases has brought the detailed interrogation of RV function back into focus. Although conductance volume assessment of the RV is more limited than the left ventricle, the scope for improving the understanding of RV adaptation to pulmonary and valvular pathologies and RV myocardial disease by using a conductance catheter still exists. We review the up-to-date functional applications of echocardiography and computed tomography/cardiac magnetic resonance to assess the RV and illustrate the potential of contemporary conductance catheter techniques to complement noninvasive imaging in the assessment of RV function. PMID:24621859

McCabe, Colm; White, Paul A; Rana, Bushra S; Gopalan, Deepa; Agrawal, Bobby; Pepke-Zaba, Joanna; Hoole, Stephen P

2014-01-01

213

Intrahospital Transport of Children on Extracorporeal Membrane Oxygenation: Indications, Process, Interventions and Effectiveness  

PubMed Central

Objective Critically ill patients supported with extracorporeal membrane oxygenation (ECMO) are transported within the hospital to the radiology suite, cardiac catheterization suite, operating room, and from one ICU to another. No studies to date have systematically evaluated intra-hospital transport (IHT) while on ECMO. This study aims to evaluate indications, process, interventions, and effectiveness of patients undergoing IHT. Design Retrospective cohort analysis. Setting Cardiac intensive care unit in a tertiary care children's hospital. Patients All patients requiring IHT while on ECMO between January 1996 and March 2007 were included and analyzed in detail. Measurement and Main Results A total of 57 IHTs for cardiac catheterization (CC) and head CT scans were analyzed. In 14/20 (70%) of CC patients, a management change occurred as a result of the diagnostic CC. In 10/17 (59%) bedside echo was of limited value in defining the critical problem. In the interventional group the majority of transports were for atrial septostomy. In the head CT group significant pathology was identified, which led to management change. No major complications occurred during these IHTs. Conclusions IHT while on ECMO is labor intensive and requiring extensive logistic support, it can be carried out safely in experienced hands and results in important therapeutic and diagnostic yields. To our knowledge this is the first study designed to evaluate safety and efficacy of IHT for patients receiving ECMO support. PMID:19593245

Prodhan, Parthak; Fiser, Richard T; Cenac, Sophia; Bhutta, Adnan T; Fontenot, Eudice; Moss, Michelle; Schexnayder, Stephen; Seib, Paul; Chipman, Carl; Weygandt, Lauren; Imamura, Michiaki; Jaquiss, Robert DB; Dyamenahalli, Umesh

2010-01-01

214

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

215

Concentrated arabinoxylan but not concentrated ?-glucan in wheat bread has similar effects on postprandial insulin as whole-grain rye in porto-arterial catheterized pigs.  

PubMed

The acute glycemic effects of concentrated dietary fibers (DF) versus whole-grain rye were studied in porto-arterial catheterized pigs. Two white wheat breads with wheat arabinoxylan (AX) or oat ?-glucan (BG), two rye breads with intact rye kernels (RK) or milled rye (GR), and a low DF white wheat bread were fed to six pigs in a randomized crossover design. Blood profiles were collected for 4 h after feeding. Glucose absorption was reduced in pigs fed the AX bread at 60 min postprandial (3.1 mmol/min for AX compared to 9.4 mmol/min for WF, P = 0.02) and insulin secretion was lowered at 30 min postprandial for AX and GR (74.4 and 129 pmol/min for AX and GR, respectively, compared to 738 pmol/min for WF, P < 0.04). In conclusion, the GR and AX breads were most effective in improving insulin economy, suggesting that arabinoxylan from wheat and rye induces similar outcomes in the metabolic response. PMID:23919413

Christensen, Kirstine L; Hedemann, Mette S; Lærke, Helle N; Jørgensen, Henry; Mutt, Shivaprakash J; Herzig, Karl-Heinz; Bach Knudsen, Knud E

2013-08-14

216

Swine model of chronic postcapillary pulmonary hypertension with right ventricular remodeling: long-term characterization by cardiac catheterization, magnetic resonance, and pathology.  

PubMed

Pulmonary hypertension (PH) is prevalent and carries high morbidity and mortality, mostly due to right ventricular (RV) dysfunction. Postcapillary PH is the most frequent form but there are no large-animal models available. We developed and characterized a porcine model of postcapillary PH by non-restrictive banding of the confluent of both inferior pulmonary veins (n = 10; sham controls n = 3). Right heart catheterization and magnetic resonance were performed before the procedure and monthly during 4 months. All banded animals developed PH. Compared to controls, banded animals presented higher mean pulmonary artery pressure [median (first to third quartile) 30 mmHg (25-37) vs. 20 mmHg (18-23); p = 0.018] and higher pulmonary vascular resistance [5.2 WU (3.8-7.1) vs. 2.3 WU (2.1-3.5); p = 0.028] after 2 months. Differences in indexed RV end-systolic volume [42 mL/m(2) (36-53) vs. 24 mL/m(2) (24-33); p = 0.028] and RV ejection fraction [59 % (54-63) vs. 66 % (64-68); p = 0.028] were also significant after 2 months. Differences remained significant throughout the study. Histopathology revealed increased lung weight and fibrosis but no increase in average water content. Also, remodeling on pulmonary arteries including increased medial and intimal thickness and fibrosis and RV myocardial disarray and fibrosis was demonstrated. Lung remodeling findings were similar in all pulmonary lobes. PMID:24771313

Pereda, Daniel; García-Alvarez, Ana; Sánchez-Quintana, Damián; Nuño, Mario; Fernández-Friera, Leticia; Fernández-Jiménez, Rodrigo; García-Ruíz, José Manuel; Sandoval, Elena; Aguero, Jaume; Castellá, Manuel; Hajjar, Roger J; Fuster, Valentín; Ibáñez, Borja

2014-07-01

217

A new technique for aesthetic labia minora reduction.  

PubMed

A new technique has been developed to reduce the labia minora yet maintain the normal labial edge and color. Labia minora enlargement can be congenital or acquired by chronic irritation, exogenous androgenic hormones, and stretching with weights. This can cause inflammation, poor hygiene, interference with sexual intercourse, or intermittent urinary self-catheterization. Aesthetically, asymmetrical or enlarged labia minora causes self-consciousness sexually and when the subject wears tight pants. Previously labia minora reduction was performed by amputation of the protuberant segment and oversewing the edge. Now, rather than amputation, a wedge of protuberant labial tissue is excised and the labial edges are reapproximated. Four patients have undergone this aesthetic procedure with excellent results. No complications occurred. The new technique is relatively simple and can greatly enhance the patient's confidence. PMID:9523614

Alter, G J

1998-03-01

218

Indices of landscape pattern  

Microsoft Academic Search

Landscape ecology deals with the patterning of ecosystems in space. Methods are needed to quantify aspects of spatial pattern that can be correlated with ecological processes. The present paper develops three indices of pattern derived from information theory and fractal geometry. Using digitized maps, the indices are calculated for 94 quadrangles covering most of the eastern United States. The indices

R. V. O'Neillr; J. R. Krummel; R. H. Gardner; G. Sugihara; B. Jackson; D. L. DeAngelist; B. T. Milne; M. G. Turner; B. Zygmunt; S. W. Christensen; V. H. Dale; R. L. Graham

1988-01-01

219

Welding-Current Indicator  

NASA Technical Reports Server (NTRS)

Light flashes on to indicate high current. Simple, inexpensive display circuit indicates when 3,000-A welding current flows in welding gun. Onset of welding current induces voltage and current in 1,000-turn, 28-gauge copper-wire coil. Single-transistor amplifier amplifies induced current, energizing light-emitting diode (LED) connected to collector of transistor. Light from LED gives simple, direct indication of welding current.

Hensley, Milton C.; Huston, Steven W.; Kroy, Ralph E.

1990-01-01

220

Marine Organisms as Indicators  

NASA Astrophysics Data System (ADS)

The term “indicator organism” can have a variety of meanings. In its narrowest and perhaps most often used sense, an indicator organism is a single species whose abundance, physiological state, or reproductive success gives the investigator information about the environmental conditions to which it has been exposed. The indicator concept has been employed traditionally by regulatory agencies to assess the consequence of anthropogenic activity, using the indicator species as a surrogate for the ecosystem as a whole. The concept of a single-indicator species useful for such purposes is, however, as one of the editors points out, “illusory as the search for alchemist's gold,” and if the reader expects that this volume contains only a review of the use of indicator organisms in pollution monitoring, he or she will be greatly surprised. The editors have instead chosen a broad definition of indicator organisms and applications. The result is that the “indicator organism” may not be an organism at all (e.g., the paper by G. S. Kleppel on pigments as trophodynamic indicators), and the environmental information conveyed, such as climatic changes or the presence of mesoscale oceanic features, is most often unrelated to man's activities.

Weston, Donald P.

221

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

222

Surgical technique: new advancements for expanding indications and safety  

Microsoft Academic Search

The technical issues discussed herein represent part of the panorama of innovative approaches proposed for the surgical treatment\\u000a of hepatocellular carcinoma (HCC); in particular, the attention is focused on the recent advances in the field of planning\\u000a the surgical strategy and performing liver dissection via ultrasound guidance. It is described how recent technical \\u000a advances have allowed the range of scenarios

Guido Torzilli

2010-01-01

223

Minimal invasive surgery for Crohn's disease – indication, technique and results  

Microsoft Academic Search

Summary  BACKGROUND: Up to 80% of all patients with Crohn's disease undergo one or more operations during the course of their illness, despite the fact that conservative treatment plays the major role in Crohn's disease. Efficiency and safety of Crohn-surgery are well proven, but the characteristics of this incurable disease cause reoperations in up to half of all patients. So the

L. Mirow; O. Schwandner; F. Fischer; S. Farke; H. P. Bruch

2006-01-01

224

[Surgical ablation of atrial fibrillation. Indications, techniques and results].  

PubMed

Catheter ablation has been the preferred choice of treatment for many patients with atrial fibrillation (AF) and advanced to a first line treatment option. However, incomplete ablation lines and varying long-term success rates remain a problem in certain subgroups, especially patients with persistent AF or large left atria. Alternative energy sources and advances in the device design have shifted the surgeons' focus on less invasive procedures. Minimally invasive performed endocardial ablation or even endoscopical ablation on the beating heart reveals success rates of 90?% freedom from atrial fibrillation at 2 years independent from the duration or type of AF. The randomized FAST-trial demonstrated superiority of endoscopic ablation compared to catheter ablation after 1 year. Given the multiple theories of the mechanism causing AF and the results that can be achieved by minimally invasive surgery, a thoroughly assessment of the individual patients is mandatory and surgery should be considered in all symptomatic patients who have failed catheter ablation or who are not good candidates for catheter ablation. PMID:23595229

Weimar, Timo; Hanke, Thorsten; Doll, Nicolas

2013-03-01

225

Radical Hysterectomy with Pelvic Lymphadenectomy: Indications, Technique, and Complications  

PubMed Central

Radical hysterectomy with pelvic lymphadenectomy remains the treatment of choice for women with Stages IA2 and IB1 carcinoma of the cervix, and selected patients with Stage II endometrial cancer. Improvement in surgical techniqe, administration of prophylactic antibiotics, thromboemolic prophylaxis, and advances in critical care medicine have resulted in lower operative morbidity associated with this procedure. Major urinary tract complications such as ureteral injury or vesico-vaginal fistula are now extremely rare (<1%). Five-year survival rates following this procedure vary according to a number of clinical and histologic variables, and may be as high as 90% in women without lymph node metastases. PMID:20871657

Ware, Rachel A.; van Nagell, John R.

2010-01-01

226

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.

227

Performance Indicators Revisited.  

ERIC Educational Resources Information Center

Information was gathered about how Technical and Further Education (TAFE) agencies throughout Australia were implementing and using performance indicators. The context of TAFE's perceived mission and corporate goals were considered. A history of the development of national performance indicators in TAFE was compiled. The project drew heavily on…

Guthrie, Hugh

228

Terrestrial Indicators and Measurements  

E-print Network

THE CRITERIA. 5 STEP 4. RATE THE INDICATORS AGAINST THE CRITERIA. 5 STEP 5. DEVELOP AND APPLY SYSTEM. TESTS FOR POTENTIAL INDICATOR SELECTION BIAS ASSOCIATED WITH EXPERTISE AND LEVEL OF KNOWLEDGE 27 standardized measurements allows data to be integrated across field office, district and state boundaries

229

Indicators for energy security  

Microsoft Academic Search

The concept of energy security is widely used, yet there is no consensus on its precise interpretation. In this research, we have provided an overview of available indicators for long-term security of supply (SOS). We distinguished four dimensions of energy security that relate to the availability, accessibility, affordability and acceptability of energy and classified indicators for energy security according to

Bert Kruyt; D. P. van Vuuren; H. J. M. de Vries; H. Groenenberg

2009-01-01

230

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.

House, The S.

2014-01-28

231

World Development Indicators, 2011.  

National Technical Information Service (NTIS)

World Development Indicators 2011, the 15th edition in its current format, aims to provide relevant, high-quality, internationally comparable statistics about development and the quality of peoples lives around the globe. This edition of World Development...

2011-01-01

232

World Development Indicators, 2012.  

National Technical Information Service (NTIS)

World Development Indicators 2012 is a compilation of relevant, high-quality, and internationally comparable statistics about development and the quality of peoples lives. Organized around six themesworld view, people, the environment, the economy, states...

2012-01-01

233

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.

234

Indicators: Change from  

E-print Network

St. Paul North- West Health Science East Bank Central Svcs. U&E Admin Preventative Maintenance: Fire of performance measures and specific color code target values. Trend status color indicators ­ identifies changes

Webb, Peter

235

Indicators: Performance Statistics  

E-print Network

1 2 3 4 5 Central Svcs. U&E Admin Preventative Maintenance: Fire/Life/Safety (FLS) 88% -1% 100% 100 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

236

Indicators: Change from  

E-print Network

St. Paul North- West Health Science East Bank Central Svcs. U&E Admin Preventative Maintenance: Fire for descriptions of performance measures and specific color code target values. Trend status color indicators

Webb, Peter

237

General Indicators: Change from  

E-print Network

Central Svcs. U&E Admin Preventative Maintenance: Fire/Life/Safety (FLS) 96% -3% 100% 100% 100% 82% 98 measures and specific color code target values. Trend status color indicators ­ identifies changes from

Webb, Peter

238

Indicators: Performance Statistics  

E-print Network

4 5 Central Svcs. U&E Admin Preventative Maintenance: Fire/Life/Safety (FLS) 89% -4% 100% 100% 100 of performance measures and specific color code target values. Trend status color indicators ­ identifies changes

Webb, Peter

239

General Indicators: Change from  

E-print Network

&E Admin Preventative Maintenance: Fire/Life/Safety (FLS) 99% +8% 100% 100% 100% 98% 94% 100% Non-FLS 92 measures and specific color code target values. Trend status color indicators ­ identifies changes from

Webb, Peter

240

Indicators: Change from  

E-print Network

Initial Target 1 2 3 4 5 Central Svcs. U&E Admin Preventative Maintenance: Fire/Life/Safety (FLS) 85% -9 for descriptions of performance measures and specific color code target values. Trend status color indicators

Webb, Peter

241

Indicators: Performance Statistics  

E-print Network

1 2 3 4 5 Central Svcs. U&E Admin Preventative Maintenance: Fire/Life/Safety (FLS) 93% +5% 100% 100 measures and specific color code target values. Trend status color indicators ­ identifies changes from

Webb, Peter

242

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 99% No Change 100% 100% 100% 99% 100% 100% Non-FLS 88% -2% 85% 99% 96 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

243

Indicators: Performance Statistics  

E-print Network

Previous Month Initial Target 1 2 3 4 5 Central Svcs. U&E Admin Preventative Maintenance: Fire for descriptions of performance measures and specific color code target values. Trend status color indicators

Webb, Peter

244

Indicators: Change from  

E-print Network

Target 1 2 3 4 5 Central Svcs. U&E Admin Preventative Maintenance: Fire/Life/Safety (FLS) 90% +11% 100 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

245

Indicators: Change from  

E-print Network

Target 1 2 3 4 5 Central Svcs. U&E Admin Preventative Maintenance: Fire/Life/Safety (FLS) 94% +4% 100 measures and specific color code target values. Trend status color indicators ­ identifies changes from

Webb, Peter

246

Indicators: Performance Statistics  

E-print Network

Target 1 2 3 4 5 Central Svcs. U&E Admin Preventative Maintenance: Fire/Life/Safety (FLS) 79% -8% 100 of performance measures and specific color code target values. Trend status color indicators ­ identifies changes

Webb, Peter

247

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...

248

Calibration of a universal indicated turbulence system  

Microsoft Academic Search

Theoretical and experimental work on a Universal Indicated Turbulence Meter is described. A mathematical transfer function from turbulence input to output indication was developed. A random ergodic process and a Gaussian turbulence distribution were assumed. A calibration technique based on this transfer function was developed. The computer contains a variable gain amplifier to make the system output independent of average

W. G. Chapin

1977-01-01

249

Aircraft control position indicator  

NASA Technical Reports Server (NTRS)

An aircraft control position indicator was provided that displayed the degree of deflection of the primary flight control surfaces and the manner in which the aircraft responded. The display included a vertical elevator dot/bar graph meter display for indication whether the aircraft will pitch up or down, a horizontal aileron dot/bar graph meter display for indicating whether the aircraft will roll to the left or to the right, and a horizontal dot/bar graph meter display for indicating whether the aircraft will turn left or right. The vertical and horizontal display or displays intersect to form an up/down, left/right type display. Internal electronic display driver means received signals from transducers measuring the control surface deflections and determined the position of the meter indicators on each dot/bar graph meter display. The device allows readability at a glance, easy visual perception in sunlight or shade, near-zero lag in displaying flight control position, and is not affected by gravitational or centrifugal forces.

Dennis, Dale V. (inventor)

1987-01-01

250

Assessing asset indices.  

PubMed

The use of asset indices in welfare analysis and poverty targeting is increasing, especially in cases in which data on expenditures are unavailable or hard to collect. We compare alternative approaches to welfare measurement. Our analysis shows that inferences about inequalities in education, health care use, fertility, and child mortality, as well as labor market outcomes, are quite robust to the economic status measure used. Different measures-most significantly per capita expenditures versus the class of asset indices-do not, however, yield identical household rankings. Two factors stand out in predicting the degree of congruence in rankings. First is the extent to which expenditures can be explained by observed household and community characteristics. Rankings are most similar in settings with small transitory shocks to expenditure or with little random measurement error in expenditure. Second is the extent to which expenditures are dominated by individually consumed goods, such as food. Asset indices are typically derived from indicators of goods that are effectively public at the household level, while expenditures are often dominated by food, an almost exclusively private good. In settings in which individually consumed goods are the main component of expenditures, asset indices and per capita consumption yield the least similar results. PMID:22135117

Filmer, Deon; Scott, Kinnon

2012-02-01

251

Cardiac Catheterization Objectives: Vascular Access  

E-print Network

states. · Aortic Insufficiency · Aortic Stenosis · Gorlin Equation · Hypertrophic Cardiomyopathy · Mitral Insufficiency · Mitral Stenosis · Gorlin Equation · Cardiomyopathy · Constrictive physiology · Cardiac Tamponade Artery Disease · Mitral Insufficiency · Hypertrophic Cardiomyopathy · Estimation of Ejection Fraction #12

Ford, James

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

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

254

Urban Environmental Justice Indices  

Microsoft Academic Search

Environmental justice is the principle that environmental costs and amenities ought to be equitably distributed within society. Due to the ethical, political, and public–health implications, and because many choices confront those researching environmental justice, standardized measures are needed to inform public dialogue and policy. We develop and test seven indices on three Colorado cities to measure the relationship between the

John Harner; Kee Warner; John Pierce; Tom Huber

2002-01-01

255

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

256

Relative soot formation indices  

Microsoft Academic Search

The smoking tendency of a practical fuel mixture, such as a coal-derived synfuel, should be empirically predictable from sooting data on the component hydrocarbons and the mixture composition. Various parameters which have been use as relative soot threshold indicators in both premixed and diffusion flames are reviewed and their usefulness as predictors of sooting tendency briefly discussed. The effects of

1982-01-01

257

"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

258

General Indicators: Performance Statistics  

E-print Network

Central Svcs. Energy Mgmt Admin Preventative Maintenance: Fire/Life/Safety (FLS) 97% +8% 100% 95% 97% 97 Chilled Utility Outages 4 +1 0 0 1 Preventative Maintenance: Fire/Life/Safety (FLS) 100% No Change 100 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

259

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 99% No Change 100% 100% 100% 100% 98% 100% Non-FLS 91% +3% 85% 98% 98 Recent Trend Initial Target Utility Outages 1 -2 0 Preventative Maintenance: Fire/Life/Safety (FLS and specific color code target values. Trend status color indicators � identifies changes from the prior month

Webb, Peter

260

General Indicators: Change from  

E-print Network

Central Svcs. Energy Mgmt Admin Preventative Maintenance: Fire/Life/Safety (FLS) 98% +2% 100% 100% 98% 99 from Previous Month Recent Trend Initial Target Utility Outages 4 +2 0 Preventative Maintenance: Fire of performance measures and specific color code target values. Trend status color indicators ­ identifies changes

Webb, Peter

261

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 100% No Change 100% 100% 100% 100% 100% 100% Non-FLS 95% +2% 85% 99% 97 Previous Month Recent Trend Initial Target Utility Outages 1 No Change 0 Preventative Maintenance: Fire of performance measures and specific color code target values. Trend status color indicators ­ identifies changes

Webb, Peter

262

Indicators: Change from  

E-print Network

Preventative Maintenance: Fire/Life/Safety (FLS) 87% +2% 100% 100% 100% 93% 100% 55% Non-FLS 86% -4% 85% 81% 94% Key: See Definitions Document for descriptions of performance measures and specific color code target values. Trend status color indicators ­ identifies changes from the prior month: 0 Electric 0 UNIVERSITY

Webb, Peter

263

Indicators: Change from  

E-print Network

: Fire/Life/Safety (FLS) 93% +16% 100% 100% 100% 100% 100% 40% Non-FLS 88% -1% 85% 98% 98% 90% 56% 33 Definitions Document for descriptions of performance measures and specific color code target values. Trend status color indicators ­ identifies changes from the prior month: District Breakdown Utilities: -10

Webb, Peter

264

General Indicators: Performance Statistics  

E-print Network

Svcs. Energy Mgmt Admin Preventative Maintenance: Fire/Life/Safety (FLS) 94% -2% 100% 99% 86% 99% 98 Chilled Utility Outages 1 No Change 0 1 0 Preventative Maintenance: Fire/Life/Safety (FLS) 99% -1% 100 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

265

General Indicators: Change from  

E-print Network

. Energy Mgmt Admin Preventative Maintenance: Fire/Life/Safety (FLS) 100% No Change 100% 100% 100% 100% 100 from Previous Month Recent Trend Initial Target Utility Outages 0 -1 0 Preventative Maintenance: Fire measures and specific color code target values. Trend status color indicators ­ identifies changes from

Webb, Peter

266

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 99% -1% 100% 100% 100% 100% 99% 100% Non-FLS 94% +9% 85% 96% 99% 91% 88 Initial Target Utility Outages 1 +1 0 Preventative Maintenance: Fire/Life/Safety (FLS) 75% -25% 100% Non color code target values. Trend status color indicators ­ identifies changes from the prior month: Steam

Webb, Peter

267

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 100% No Change 100% 100% 100% 100% 100% 100% Non-FLS 96% -1% 85% 97% 85 Initial Target Utility Outages 0 No Change 0 Preventative Maintenance: Fire/Life/Safety (FLS) 94% -2 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

268

General Indicators: Performance Statistics  

E-print Network

Science East Bank Central Svcs. Energy Mgmt Admin Preventative Maintenance: Fire/Life/Safety (FLS) 96% +11: Fire/Life/Safety (FLS) 100% +1% 100% 100% Non-FLS 94% +17% 70% 92% Key: See Definitions Document for descriptions of performance measures and specific color code target values. Trend status color indicators

Webb, Peter

269

General Indicators: Change from  

E-print Network

&E Admin Preventative Maintenance: Fire/Life/Safety (FLS) 91% +3% 100% 99% 100% 98% 100% 29% Non-FLS 94% -2% 70% Key: See Definitions Document for descriptions of performance measures and specific color code target values. Trend status color indicators ­ identifies changes from the prior month: 100% 64

Webb, Peter

270

General Indicators: Performance Statistics  

E-print Network

Central Svcs. Energy Mgmt Admin Preventative Maintenance: Fire/Life/Safety (FLS) 98% +6% 100% 98% 89% 99 Chilled Utility Outages 0 -1 0 0 0 Preventative Maintenance: Fire/Life/Safety (FLS) 100% No Change 100 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

271

General Indicators: Performance Statistics  

E-print Network

Bank Central Svcs. Energy Mgmt Admin Preventive Maintenance: Fire/Life/Safety (FLS) 85% -12% 100% 80 Trend Initial Target Steam Chilled Utility Outages 3 -5 0 1 0 Preventive Maintenance: Fire for descriptions of performance measures and specific color code target values. Trend status color indicators

Webb, Peter

272

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 99% No Change 100% 100% 100% 100% 99% 100% Non-FLS 91% +2% 85% 97% 97 Trend Initial Target Utility Outages 2 +1 0 Preventative Maintenance: Fire/Life/Safety (FLS) 100 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

273

General Indicators: Performance Statistics  

E-print Network

Mgmt Admin Preventative Maintenance: Fire/Life/Safety (FLS) 92% -5% 100% 88% 90% 97% 100% Non-FLS 77 Utility Outages 1 -3 0 0 0 Preventative Maintenance: Fire/Life/Safety (FLS) 100% No Change 100% 100% Non color code target values. Trend status color indicators ­ identifies changes from the prior month: 92

Webb, Peter

274

General Indicators: Change from  

E-print Network

- West Health Science East Bank Central Svcs. Energy Mgmt Admin Preventative Maintenance: Fire: Fire/Life/Safety (FLS) 98% -1% 100% Non-FLS 84% -7% 70% Key: See Definitions Document for descriptions of performance measures and specific color code target values. Trend status color indicators ­ identifies changes

Webb, Peter

275

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 100% +1% 100% 100% 100% 100% 100% 100% Non-FLS 93% +1% 85% 97% 88% 93 Month Recent Trend Initial Target Utility Outages 1 +1 0 Preventative Maintenance: Fire of performance measures and specific color code target values. Trend status color indicators ­ identifies changes

Webb, Peter

276

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 99% +3% 100% 100% 100% 100% 98% 100% Non-FLS 90% +9% 85% 90% 92% 93% 87 Definitions Document for descriptions of performance measures and specific color code target values. Trend status color indicators ­ identifies changes from the prior month: All Districts Combined 2 Electric 1

Webb, Peter

277

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 99% No Change 100% 99% 100% 99% 99% 100% Non-FLS 94% -1% 90% 92% 96% 98 Trend Initial Target Utility Outages 3 +3 0 Preventative Maintenance: Fire/Life/Safety (FLS) 100 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

278

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 93% -6% 100% 100% 100% 100% 100% 83% Non-FLS 95% +1% 90% 95% 98% 97% 92% 0 Maintenance: Fire/Life/Safety (FLS) 97% -3% 100% Non-FLS 94% -2% 70% Key: See Definitions Document for descriptions of performance measures and specific color code target values. Trend status color indicators

Webb, Peter

279

General Indicators: Change from  

E-print Network

Preventative Maintenance: Fire/Life/Safety (FLS) 100% +1% 100% 100% 100% 100% 100% 100% Non-FLS 94% -1% 85 Month Recent Trend Initial Target Utility Outages 7 +7 0 Preventative Maintenance: Fire measures and specific color code target values. Trend status color indicators ­ identifies changes from

Webb, Peter

280

General Indicators: Performance Statistics  

E-print Network

Central Svcs. Energy Mgmt Admin Preventative Maintenance: Fire/Life/Safety (FLS) 85% No Change 100% 90 Trend Initial Target Steam Chilled Utility Outages 2 -1 0 0 1 Preventative Maintenance: Fire of performance measures and specific color code target values. Trend status color indicators ­ identifies changes

Webb, Peter

281

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 100% No Change 100% 100% 100% 100% 100% 100% Non-FLS 97% +1% 85% 94% 98 Trend Initial Target Utility Outages 2 +2 0 Preventative Maintenance: Fire/Life/Safety (FLS) 100% +6 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

282

General Indicators: Performance Statistics  

E-print Network

Central Svcs. Energy Mgmt Admin Preventative Maintenance: Fire/Life/Safety (FLS) 85% -13% 100% 94% 98% 62 Chilled Utility Outages 3 +3 0 0 2 Preventative Maintenance: Fire/Life/Safety (FLS) 100% No Change 100 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

283

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 100% No Change 100% 100% 100% 100% 100% 100% Non-FLS 97% +2% 85% 97% 99: Fire/Life/Safety (FLS) 96% -4% 100% Non-FLS 100% No Change 70% Key: See Definitions Document for descriptions of performance measures and specific color code target values. Trend status color indicators

Webb, Peter

284

General Indicators: Performance Statistics  

E-print Network

Health Science East Bank Central Svcs. Energy Mgmt Admin Preventative Maintenance: Fire/Life/Safety (FLS Chilled Utility Outages 3 -2 0 1 0 Preventative Maintenance: Fire/Life/Safety (FLS) 100% No Change 100 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

285

General Indicators: Performance Statistics  

E-print Network

Science East Bank Central Svcs. Energy Mgmt Admin Preventative Maintenance: Fire/Life/Safety (FLS) 91% -3 Maintenance: Fire/Life/Safety (FLS) 100% +1% 100% 100% Non-FLS 78% +8% 70% 75% Key: See Definitions Document for descriptions of performance measures and specific color code target values. Trend status color indicators

Webb, Peter

286

General Indicators: Change from  

E-print Network

- West Health Science East Bank Central Svcs. U&E Admin Preventative Maintenance: Fire/Life/Safety (FLS% -12% 70% Key: See Definitions Document for descriptions of performance measures and specific color code target values. Trend status color indicators ­ identifies changes from the prior month: 100% 63

Webb, Peter

287

General Indicators: Change from  

E-print Network

Preventative Maintenance: Fire/Life/Safety (FLS) 99% +1% 100% 100% 100% 100% 98% 99% Non-FLS 95% +7% 85% 96 Trend Initial Target Utility Outages 0 -2 0 Preventative Maintenance: Fire/Life/Safety (FLS) 100 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

288

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 99% -1% 100% 100% 100% 100% 99% 95% Non-FLS 95% -2% 85% 99% 95% 93% 95 Trend Initial Target Utility Outages 0 -2 0 Preventative Maintenance: Fire/Life/Safety (FLS) 100 measures and specific color code target values. Trend status color indicators ­ identifies changes from

Webb, Peter

289

General Indicators: Performance Statistics  

E-print Network

Bank Central Svcs. Energy Mgmt Admin Preventive Maintenance: Fire/Life/Safety (FLS) 87% -4% 100% 47 Trend Initial Target Steam Chilled Utility Outages 2 +1% 0 0 0 Preventive Maintenance: Fire for descriptions of performance measures and specific color code target values. Trend status color indicators

Webb, Peter

290

General Indicators: Change from  

E-print Network

Mgmt Admin Preventative Maintenance: Fire/Life/Safety (FLS) 99% +1% 100% 100% 100% 95% 100% 100% Non Recent Trend Initial Target Chilled Utility Outages 1 -3 0 1 Preventative Maintenance: Fire of performance measures and specific color code target values. Trend status color indicators ­ identifies changes

Webb, Peter

291

General Indicators: Performance Statistics  

E-print Network

. Energy Mgmt Admin Preventive Maintenance: Fire/Life/Safety (FLS) 97% +10% 100% 96% 93% 99% 98% Non Chilled Utility Outages 8 +6% 0 1 2 Preventive Maintenance: Fire/Life/Safety (FLS) 100% No Change 100 and specific color code target values. Trend status color indicators ­ identifies changes from the prior month

Webb, Peter

292

General Indicators: Change from  

E-print Network

Maintenance: Fire/Life/Safety (FLS) 96% +3% 100% 100% 100% 100% 99% 87% Non-FLS 97% +2% 90% 99% 97% 95% 96 Maintenance: Fire/Life/Safety (FLS) 99% +2% 100% Non-FLS 94% No Change 70% Key: See Definitions Document for descriptions of performance measures and specific color code target values. Trend status color indicators

Webb, Peter

293

Indicators: Change from  

E-print Network

: Fire/Life/Safety (FLS) 77% -13% 100% 100% 100% 99% 97% 32% Non-FLS 89% +3% 85% 96% 98% 92% 49% 33 Definitions Document for descriptions of performance measures and specific color code target values. Trend status color indicators ­ identifies changes from the prior month: 1 Electric 0 UNIVERSITY SERVICES

Webb, Peter

294

General Indicators: Change from  

E-print Network

: Fire/Life/Safety (FLS) 99% -1% 100% 99% 100% 100% 99% 100% Non-FLS 92% -2% 85% 94% 96% 93% 85% 100 Previous Month Recent Trend Initial Target Utility Outages 0 -7 0 Preventative Maintenance: Fire measures and specific color code target values. Trend status color indicators ­ identifies changes from

Webb, Peter

295

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

296

Indications for Fetal Echocardiography  

Microsoft Academic Search

Congenital heart disease is one of the most common congenital malformations diagnosed in liveborns. As more women undergo prenatal diagnosis, the need for screening fetal echocadiography increases. The fetal, maternal, and familial indications for fetal echocadiography are outlined in order to improve the identification of women in greatest need for this screening modality.

M. Small; J. A. Copel

2004-01-01

297

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...

298

Trends & Indicators: Enrollment Period  

ERIC Educational Resources Information Center

Since New England Board of Higher Education (NEBHE) began publishing tables and charts exploring "Trends & Indicators" in New England higher education more than a half-century ago, few figures have grabbed as much attention as college "enrollment" data. These local, state, regional and national data go beyond simple headcounts of students going to…

Harney, John O.

2011-01-01

299

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

300

LEADING WITH LEADING INDICATORS  

SciTech Connect

This paper documents Fluor Hanford's use of Leading Indicators, management leadership, and statistical methodology in order to improve safe performance of work. By applying these methods, Fluor Hanford achieved a significant reduction in injury rates in 2003 and 2004, and the improvement continues today. The integration of data, leadership, and teamwork pays off with improved safety performance and credibility with the customer. The use of Statistical Process Control, Pareto Charts, and Systems Thinking and their effect on management decisions and employee involvement are discussed. Included are practical examples of choosing leading indicators. A statistically based color coded dashboard presentation system methodology is provided. These tools, management theories and methods, coupled with involved leadership and employee efforts, directly led to significant improvements in worker safety and health, and environmental protection and restoration at one of the nation's largest nuclear cleanup sites.

PREVETTE, S.S.

2005-01-27

301

Health Care Indicators  

PubMed Central

This regular feature of the journal includes a discussion of each of the following four topics: community hospital statistics; employment, hours, and earnings in the private health sector; health care prices; and national economic indicators. These statistics are valuable in their own right for understanding the relationship between the health care sector and the overall economy. In addition, they allow us to anticipate the direction and magnitude of health care cost changes prior to the availability of more comprehensive data. PMID:25372574

Donham, Carolyn S.; Maple, Brenda T.; Letsch, Suzanne W.

1993-01-01

302

Industrial energy use indices  

E-print Network

.1 to 1.7 depending on the energy sources considered. The large data scatter indicates that predictions of energy use obtained by multiplying standard EUI data by plant area may be inaccurate and are less accurate in warmer than colder climates (warmer... and colder are determined by annual average temperature weather data). Data scatter may have several explanations, including climate, plant area accounting, the influence of low cost energy and low cost buildings used in the south of the U.S. iv...

Hanegan, Andrew Aaron

2008-10-10

303

Strategies for optimizing outcomes in the NSTE-ACS patient The CATH (cardiac catheterization and antithrombotic therapy in the hospital) Clinical Consensus Panel Report.  

PubMed

This paper provides a comprehensive up-to-date review of the medical and invasive management of patients with non- ST-segment elevation acute coronary syndromes (NSTE-ACS). The authors have summarized findings from key clinical trials published recent years that contribute to clinicians' understanding of how best to optimize therapy. The goals for the management of NSTE-ACS are rapid and accurate risk stratification, appropriate and institution-specific triage to interventional versus medical strategies and optimal pharmacologic therapy--all of which provide for a smooth and seamless transition of care between the emergency department and the cardiology service. High-risk features or absolute treatment trigger criteria that support more aggressive medical therapy (i.e., addition of small-molecule GP IIb/IIIa inhibitor to a core regimen of aspirin, enoxaparin, and in most cases, clopidogrel) and/or that would direct clinicians toward percutaneous, mechanical/interventional strategies as the preferred modality include, but are not limited to, the presence of one or more of the following: (1) elevated cardiac markers (troponin and/or CK-MB); (2) elevated levels of inflammatory markers (particularly CRP > 3 microg/dl); (3) age > 65 years; (4) presence of ST-T wave changes; (5) TIMI Risk Score greater than or equal to 4; (6) diabetes; and/or (7) clinical instability in the setting of suspected NSTE-ACS. Specific clinical, ECG and/or biochemical trigger points modulate the aggressiveness of both the medical therapy and the propensity to perform early angiography with or without subsequent revascularization in patients with NSTE-ACS. Although additional refinements and changes in ACS management are still to come, evidence-based strategies suggest that prompt mechanical revascularization is associated with the best possible clinical outcomes, particularly for patients with high-risk features and in whom benefits of adjunctive, pharmacoinvasive antithrombotic therapies can be consolidated. Patient transfer for cardiac catheterization/percutaneous coronary intervention (PCI) is strongly recommended in patients who manifest high-risk features and/or aggressive treatment trigger criteria, so that this high-risk subgroup may receive definitive, interventional and/or cardiology-directed specialty care at appropriate sites of care. When available, interventional management is preferred in these patients. The importance of safe and effective anticoagulation in the spectrum of management strategies has been confirmed, and the evidence in support of enoxaparin and other antithrombotic agents has been reviewed. Dosing recommendations for enoxaparin use in the setting of PCI have been issued by the CATH Panel and have been summarized in this consensus report. Similar recommendations have been presented for the use of oral antiplatelet agents and GP IIb/IIIa antagonists. The addition of statins, ACE-inhibitors and beta-blockers is also stressed as part of a comprehensive secondary cardioprotective strategy for patients with coronary heart disease. PMID:17197714

Cohen, Marc; Diez, Jose; Fry, Edward; Rao, Sunil V; Ferguson, James J; Zidar, James; Levine, Glenn; Shani, Jacob

2006-12-01

304

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

305

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.

306

Trust in performance indicators?  

PubMed Central

The 1980s and 90s have seen the proliferation of all forms of performance indicators as part of attempts to command and control health services. The latest area to receive attention is health outcomes. Published league tables of mortality and other health outcomes have been available in the United States for some time and in Scotland since the early 1990s; they have now been developed for England and Wales. Publication of these data has proceeded despite warnings as to their limited meaningfulness and usefulness. The time has come to ask whether the remedy is worse than the malady: are published health outcomes contributing to quality efforts or subverting more constructive approaches? This paper argues that attempts to force improvements through publishing health outcomes can be counterproductive, and outlines an alternative approach which involves fostering greater trust in professionalism as a basis for quality enhancements. PMID:10185142

Davies, H. T.; Lampel, J.

1998-01-01

307

Expanded indications for ultrasound-guided thrombin injection of pseudoaneurysms  

Microsoft Academic Search

Purpose. We previously reported preliminary data on a new procedure that we developed for the treatment of femoral pseudoaneurysms after catheterization. This study presents our current results of percutaneous ultrasound-guided thrombin injection for treating pseudoaneurysms that arise from various locations and causes.Methods: Between February 1996 and May 1999, we performed thrombin injection of 83 pseudoaneurysms in 82 patients. There were

Steven S Kang; Nicos Labropoulos; M. Ashraf Mansour; Mary Michelini; Dusty Filliung; Mary Pat Baubly; William H Baker

2000-01-01

308

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

309

Teaching Techniques  

E-print Network

. Demonstration This technique, also known as method demon- stration, involves the teacher showing youth how to do something. For example: how to change a tire, prepare a recipe or make a tie knot. Another kind of demonstration is the result demonstration.... Demonstration This technique, also known as method demon- stration, involves the teacher showing youth how to do something. For example: how to change a tire, prepare a recipe or make a tie knot. Another kind of demonstration is the result demonstration...

Howard, Jeff W.

2005-05-10

310

Discovery of climate indices using clustering  

Microsoft Academic Search

To analyze the effect of the oceans and atmosphere on land climate, Earth Scientists have developed climate indices, which are time series that summarize the behavior of selected regions of the Earth's oceans and atmosphere. In the past, Earth scientists have used observation and, more recently, eigenvalue analysis techniques, such as principal components analysis (PCA) and singular value decomposition (SVD),

Michael Steinbach; Pang-Ning Tan; Vipin Kumar; Steven A. Klooster; Christopher Potter

2003-01-01

311

[Surgical lung biopsy: Indications and therapeutic implications].  

PubMed

Surgical biopsy of lung parenchyma can be used to establish a diagnosis in interstitial lung disease both of acute and chronic presentation. The present article summarizes the current indications, the therapeutic implications, the different surgical techniques and postoperative complications of the procedure. Common controversies and problems related to surgical lung biopsy are also presented. PMID:22425502

Radu, D M; Macey, J; Bouvry, D; Seguin, A; Valeyre, D; Martinod, E

2012-04-01

312

Decomposition techniques  

USGS Publications Warehouse

Sample decomposition is a fundamental and integral step in the procedure of geochemical analysis. It is often the limiting factor to sample throughput, especially with the recent application of the fast and modern multi-element measurement instrumentation. The complexity of geological materials makes it necessary to choose the sample decomposition technique that is compatible with the specific objective of the analysis. When selecting a decomposition technique, consideration should be given to the chemical and mineralogical characteristics of the sample, elements to be determined, precision and accuracy requirements, sample throughput, technical capability of personnel, and time constraints. This paper addresses these concerns and discusses the attributes and limitations of many techniques of sample decomposition along with examples of their application to geochemical analysis. The chemical properties of reagents as to their function as decomposition agents are also reviewed. The section on acid dissolution techniques addresses the various inorganic acids that are used individually or in combination in both open and closed systems. Fluxes used in sample fusion are discussed. The promising microwave-oven technology and the emerging field of automation are also examined. A section on applications highlights the use of decomposition techniques for the determination of Au, platinum group elements (PGEs), Hg, U, hydride-forming elements, rare earth elements (REEs), and multi-elements in geological materials. Partial dissolution techniques used for geochemical exploration which have been treated in detail elsewhere are not discussed here; nor are fire-assaying for noble metals and decomposition techniques for X-ray fluorescence or nuclear methods be discussed. ?? 1992.

Chao, T.T.; Sanzolone, R.F.

1992-01-01

313

Science and Engineering Indicators--1996  

NSF Publications Database

S&EScience and Engineering Indicators - 1996This report is available in hypertext and Portable ... Indicators 1996Portable Document Format (.pdf)Science & Engineering Indicators 1996U.S. Science and ...

314

Science and Engineering Indicators: 1996  

NSF Publications Database

Science and Engineering Indicators - 1996This report is available in hypertext and Portable Document ... Indicators 1996Portable Document Format (.pdf)Science & Engineering Indicators 1996U.S. Science and ...

315

Science and Engineering Indicators: 1993  

NSF Publications Database

Science & Science & Engineering Indicators '93 provides a comprehensive overview of the science ... The hypertext version of the Science & Engineering Indicators '93 was developed under contract to ...

316

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

317

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

318

Complementarity as a biodiversity indicator strategy.  

PubMed Central

Richness, rarity, endemism and complementarity of indicator taxon species are often used to select conservation areas, which are then assumed to represent most regional biodiversity. Assessments of the degree to which these indicator conservation areas coincide across different taxa have been conducted on a variety of vertebrate, invertebrate and plant groups at a national scale in Britain, Canada, USA and South Africa and at a regional scale in Cameroon, Uganda and the USA. A low degree of spatial overlap among and within these selected indicator conservation areas has been demonstrated. These results tend to suggest that indicator conservation areas display little congruence across different taxa. However, some of these studies demonstrate that many conservation areas for indicator taxa capture a high proportion of non-target species. Thus it appears that indicator conservation areas might sample overall biodiversity efficiently. These indicator conservation areas may, however, exclude species essential for effective conservation, e.g. rare, endemic or endangered species. The present study investigated the value of indicator taxa as biodiversity surrogates using spatial congruence and representativeness of different indicator priority conservation areas. The conservation status of species excluded by the indicator approaches is also assessed. Indicator priority conservation areas demonstrate high land area requirements in order to fully represent non-target species. These results suggest that efficient priority area selection techniques must reach a compromise between maximizing non-target species gains and minimizing land-use requirements. Reserve selection procedures using indicator-based complementarity appear to be approaches which best satisfy this trade-off. PMID:10737409

Reyers, B; van Jaarsveld, A S; Kruger, M

2000-01-01

319

Indications and limitations of splints and casts.  

PubMed

Long bone fractures are relatively common in cattle, whether they result from a self-inflicted trauma or from external actors (herd mate or farm machinery). Various advanced orthopedic techniques have been described to stabilize and treat fractures in cattle with success. Unfortunately the use of most of those techniques remains unrealistic in a field setting, rendering the realization of splints and casts still accurate for the treatment of long bone fracture in cattle. This article refers to the use of all external coaptation and their specific indications as well as their limitations. PMID:24534659

Mulon, Pierre-Yves; Desrochers, André

2014-03-01

320

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

321

Calibration of a universal indicated turbulence system  

NASA Technical Reports Server (NTRS)

Theoretical and experimental work on a Universal Indicated Turbulence Meter is described. A mathematical transfer function from turbulence input to output indication was developed. A random ergodic process and a Gaussian turbulence distribution were assumed. A calibration technique based on this transfer function was developed. The computer contains a variable gain amplifier to make the system output independent of average velocity. The range over which this independence holds was determined. An optimum dynamic response was obtained for the tubulation between the system pitot tube and pressure transducer by making dynamic response measurements for orifices of various lengths and diameters at the source end.

Chapin, W. G.

1977-01-01

322

[Indications for PCR in travel medicine].  

PubMed

The use of PCR-based molecular diagnosis in travel medicine remains limited to specific indications such as clinical suspicion of some of the viral hemorrhagic fevers (e.g. Ebola, Marburg), differential diagnosis between Entamoeba histolytica (pathogen) and E. dispar (non pathogen) in the stools, and parasitological diagnosis of cutaneous leishmaniasis. The scope of indications is likely to expand in the coming years with the development of techniques (e.g. multiplex PCR) able to identify several pathogens from a single sample. Simplification and cost-reduction of molecular techniques, which would allow for more equitable access to these diagnostic tools in countries where the targeted diseases are highly prevalent, pose major technological and ethical challenges. PMID:21692311

Chappuis, F

2011-05-11

323

Guaranteeing Correctness and Availability in P2P Range Indices  

E-print Network

scal- ability and fault-tolerance is to store such objects as (value,item) pairs in a P2P index, where been recent work on developing new P2P range indices, none of these indices guarantee correctness and availability of P2P range indices. We develop our techniques in the context of a general P2P indexing framework

324

Edible Acid-Base Indicators.  

ERIC Educational Resources Information Center

Reports on the colors observed during titrations of 15 natural indicators obtained from common fruits and vegetables. These edible indicators can be used for a variety of teacher demonstrations or for simple student experiments. (JN)

Mebane, Robert C.; Rybolt, Thomas R.

1985-01-01

325

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

326

Indicators for Assessing Sustainability Performance  

Microsoft Academic Search

Sustainability is a universally advocated and quoted concept. To assess the sustainability performance of an entity, e.g,. a company, an industry or a country, appropriate indicators are often developed for the use of analysts and decision makers.\\u000a Numerous sustainability indicators can be found in the literature, which vary from a non-composite indicators to composite\\u000a indicators. We first deal with non-composite

P. Zhou; B. W. Ang

327

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

328

Percutaneous mitral valvuloplasty: retrograde, transarterial double-balloon technique utilizing the transseptal approach.  

PubMed

Between February 1985 and May 1987, 72 patients with mitral stenosis (MS) underwent percutaneous transluminal mitral valvuloplasty (PTMV). The retrograde transarterial double-balloon technique was used on 54/72 patients (75%); 16 males, 38 females; mean age: 39 +/- 11 years. Transseptal catheterization was used to place two 0.035", 350-cm exchange wires into the ascending aorta in order to be snared, retrieved, and exteriorized, each through a femoral artery. Over these wires, the balloon dilation catheters were advanced through the femoral artery, retrogradely, across the mitral valve, for PTMV. The transmitral mean gradient fell [18 +/- 4 to 9 +/- 5 mmHg (P less than 0.001)]; the cardiac output increased [5.1 +/- 0.8 6.1 +/- 0.8 L/min (P less than 0.001)]; the hemodynamically calculated valve area increased [1.2 +/- 0.2 to 2.3 +/- 0.6 cm2 (P less than 0.001)]; and the short axis two-dimensional echocardiographic valve area increased [1.1 +/- 0.3 to 2.2 +/- 0.7 (P less than 0.001)]. PTMV was unsuccessful in two patients (4%), due to the inability to maintain the inflated balloons in the mitral position. Significant complications were encountered in two patients: two strokes (3.7%) and one mortality from the stroke (1.4%). Significant mitral regurgitation occurred in two patients (3.7%); no post-PTMV hemodynamically significant atrial septal defects were detected. Follow-up (mean time: 11 +/- 6 months) of 43 patients showed a persistent improvement in echocardiographic findings in 27 (63%) and hemodynamically measured mitral valve area in the 16 patients in which cardiac catheterization was repeated. The retrograde, transarterial double-balloon technique can successfully accomplish PTMV with good results and an acceptable low morbidity and mortality. PMID:3396065

Babic, U U; Dorros, G; Pejcic, P; Djurisic, Z; Vucinic, M; Lewin, R F; Grujicic, S N

1988-01-01

329

Techniques of Male Circumcision  

PubMed Central

Male circumcision is a controversial subject in surgical practice. There are, however, clear surgical indications of this procedure. The American Academy of Pediatrics (AAP) recommends newborn male circumcision for its preventive and public health benefits that has been shown to outweigh the risks of newborn male circumcision. Many surgical techniques have been reported. The present review discusses some of these techniques with their merits and drawbacks. This is an attempt to inform the reader on surgical aspects of male circumcision aiding in making appropriate choice of a technique to offer patients. Pubmed search was done with the keywords: Circumcision, technique, complications, and history. Relevant articles on techniques of circumcision were selected for the review. Various methods of circumcision including several devices are in use for male circumcision. These methods can be grouped into three: Shield and clamp, dorsal slit, and excision. The device methods appear favored in the pediatric circumcision while the risk of complications increases with increasing age of the patient at surgery. PMID:24470842

Abdulwahab-Ahmed, Abdullahi; Mungadi, Ismaila A.

2013-01-01

330

Techniques of male circumcision.  

PubMed

Male circumcision is a controversial subject in surgical practice. There are, however, clear surgical indications of this procedure. The American Academy of Pediatrics (AAP) recommends newborn male circumcision for its preventive and public health benefits that has been shown to outweigh the risks of newborn male circumcision. Many surgical techniques have been reported. The present review discusses some of these techniques with their merits and drawbacks. This is an attempt to inform the reader on surgical aspects of male circumcision aiding in making appropriate choice of a technique to offer patients. Pubmed search was done with the keywords: Circumcision, technique, complications, and history. Relevant articles on techniques of circumcision were selected for the review. Various methods of circumcision including several devices are in use for male circumcision. These methods can be grouped into three: Shield and clamp, dorsal slit, and excision. The device methods appear favored in the pediatric circumcision while the risk of complications increases with increasing age of the patient at surgery. PMID:24470842

Abdulwahab-Ahmed, Abdullahi; Mungadi, Ismaila A

2013-01-01

331

Action indicators for injury prevention.  

PubMed

There is considerable confusion about the nature of indicators, their use in the injury field and surprisingly little discussion about these important tools. To date discussions of injury indicators have focused on the content and presentation of health outcome measures and on the dearth of data on exposure measures. Whereas these are valuable measures and assessing the optimal use of available routinely collected data in forming indicators is important, they do not provide sufficient information to support comprehensive prevention efforts, nor do they harness the full potential of indicators as tools to support prevention efforts. This paper provides an overview of the characteristics and uses of indicators for the field of injury prevention in order to make the case for action indicators and provide a framework for their appropriate use. PMID:20570988

MacKay, J Morag; Macpherson, Alison K; Pike, Ian; Vincenten, Joanne; McClure, Rod

2010-06-01

332

Giant Dilatation of the Right Coronary Aortic Bulb with Compression of the Right Ventricular Outflow Tract Mimicking a Ventricular Septal Defect: Diagnostic workup Using Echocardiography, Heart Catheterization, and Cardiac Computed Tomography  

PubMed Central

Annuloaortic ectasia is a relatively rare diagnosis. Herein, we report an unusual case of an annuloaortic ectasia with asymmetric dilatation of the right coronary bulb mimicking a membranous ventricular septal defect (VSD) with Eisenmenger reaction by transthoracic echocardiography. Aortic angiography showed a dilated aortic root and moderate aortic regurgitation. Right cardiac catheterization, on the other hand, exhibited normal pulmonary artery blood pressure and normal pulmonary resistance, whereas normal venous gas values were measured throughout the caval vein and the right atrium, excluding relevant left-right shunting. Further diagnostic workup by cardiac computed tomography angiography (CCTA) unambiguously illustrated the asymmetric geometry of the ectatic aortic cusp and root causing compression of the right heart and of the right ventricular (RV) outflow tract. After review of echocardiographic acquisitions, the blood flow detected between the left and right ventricles (mimicking VSD) was interpreted as turbulent inflow from the left ventricle into the ectatic right coronary cusp. Furthermore, elevated pulmonary artery blood pressure measured by echocardiography was attributed to “functional pulmonary stenosis” due to compression of the RV outflow tract by the aorta, as demonstrated by CCTA. PMID:22952479

Hofmann, Nina P.; Abdel-Aty, Hassan; Siebert, Stefan; Katus, Hugo A.; Korosoglou, Grigorios

2012-01-01

333

Controversially discussed indications for immunization  

Microsoft Academic Search

The indication for immunization in general or indications for selected vaccines are sometimes controversially discussed by\\u000a parents, the media and even by some parts of the medical community. This controversial discussion can cause confusion for\\u000a people who want to make decisions about immunization for their children or themselves. There is clearly a need for accurate\\u000a and evidence-based information about indications

Sieghart Dittmann

334

Leading Indicators of Currency Crises  

Microsoft Academic Search

This paper examines the empirical evidence on currency crises and proposes a specific early warning system. This system involves monitoring the evolution of several indicators that tend to exhibit an unusual behavior in the periods preceding a crisis. When an indicator exceeds a certain threshold value, this is interpreted as a warning \\

Graciela Kaminsky; Carmen M. Reinhart

1998-01-01

335

Lexical-Grammatical Pragmatic Indicators.  

ERIC Educational Resources Information Center

A study of the interlanguage pragmatics of learners of Hebrew and English (L2s) focuses on pragmatic indicators used in requests and apologies (situations in Appendix). Deviations from native-speaker norms in the speech of non-native speakers are discussed. Results suggest L2s' misuse of pragmatic indicators can have serious interactional…

Blum-Kulka, Shoshana; Levenston, Edward A.

1987-01-01

336

Calibration of rod position indicators  

Microsoft Academic Search

This patent describes a procedure for calibration of a rod position indicator in a nuclear reactor having movable control rods without total shutdown of the reactor. It comprises: noting that the indicated position of a rod differs from a demand position of the rod by an extent exceeding a predetermined error range, determining that the rod is actually within the

A. P. Ginsberg; J. P. Mooney

1991-01-01

337

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...

338

Council High LevelCouncil High Level IndicatorsIndicators  

E-print Network

Wildlife ·· Wildlife habitat units by dam: lostWildlife habitat units by dam: lost and acquiredand acquired #12 INDICATORS,, ContinuedContinued ScreensScreens ·· Diversion screens installed.Diversion screens installed

339

Indication for VATS sublobar resections in early lung cancer  

PubMed Central

When dealing with early non-small cell lung cancer (NSCLC) sublobar resections still remain part of the surgical armamentarium. In selected patients with lung cancer, the combination of the potential benefits of parenchyma sparing procedures to the limited trauma provided by Video Assisted Thoracic Surgery (VATS) techniques can become very appealing. Two main groups are included: non-anatomical (wedges) and anatomical (segmentectomies) excisions. We describe the techniques, results and potential indications of both of these techniques. PMID:24040523

Delgado Roel, Maria

2013-01-01

340

Developing indicators for European birds  

PubMed Central

The global pledge to deliver ‘a significant reduction in the current rate of biodiversity loss by 2010’ is echoed in a number of regional and national level targets. There is broad consensus, however, that in the absence of conservation action, biodiversity will continue to be lost at a rate unprecedented in the recent era. Remarkably, we lack a basic system to measure progress towards these targets and, in particular, we lack standard measures of biodiversity and procedures to construct and assess summary statistics. Here, we develop a simple classification of biodiversity indicators to assist their development and clarify purpose. We use European birds, as example taxa, to show how robust indicators can be constructed and how they can be interpreted. We have developed statistical methods to calculate supranational, multi-species indices using population data from national annual breeding bird surveys in Europe. Skilled volunteers using standardized field methods undertake data collection where methods and survey designs differ slightly across countries. Survey plots tend to be widely distributed at a national level, covering many bird species and habitats with reasonable representation. National species' indices are calculated using log-linear regression, which allows for plot turnover. Supranational species' indices are constructed by combining the national species' indices weighted by national population sizes of each species. Supranational, multi-species indicators are calculated by averaging the resulting indices. We show that common farmland birds in Europe have declined steeply over the last two decades, whereas woodland birds have not. Evidence elsewhere shows that the main driver of farmland bird declines is increased agricultural intensification. We argue that the farmland bird indicator is a useful surrogate for trends in other elements of biodiversity in this habitat. PMID:15814345

Gregory, Richard D; van Strien, Arco; Vorisek, Petr; Gmelig Meyling, Adriaan W; Noble, David G; Foppen, Ruud P.B; Gibbons, David W

2005-01-01

341

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.

342

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...

343

Complement Diagnostics: Concepts, Indications, and Practical Guidelines  

PubMed Central

Aberrations in the complement system have been shown to be direct or indirect pathophysiological mechanisms in a number of diseases and pathological conditions such as autoimmune disease, infections, cancer, allogeneic and xenogeneic transplantation, and inflammation. Complement analyses have been performed on these conditions in both prospective and retrospective studies and significant differences have been found between groups of patients, but in many diseases, it has not been possible to make predictions for individual patients because of the lack of sensitivity and specificity of many of the assays used. The basic indications for serological diagnostic complement analysis today may be divided into three major categories: (a) acquired and inherited complement deficiencies; (b) disorders with complement activation; (c) inherited and acquired C1INH deficiencies. Here, we summarize indications, techniques, and interpretations for basic complement analyses and present an algorithm, which we follow in our routine laboratory. PMID:23227092

Nilsson, Bo; Ekdahl, Kristina Nilsson

2012-01-01

344

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

345

Indicators for complex innovation systems  

Microsoft Academic Search

Performance indicators such as national wealth (GDP per capita), R&D intensity (GERD\\/GDP) and scientific impact (citations\\/paper) are used to compare innovation systems. These indicators are derived from the ratio of primary measures such as population, GDP, GERD and papers. Frequently they are used to rank members of an innovation system and to inform decision makers. This is illustrated by the

J. Sylvan Katz; Viv Cothey

2006-01-01

346

Energy Efficiency Indicators Methodology Booklet  

SciTech Connect

This Methodology Booklet provides a comprehensive review and methodology guiding principles for constructing energy efficiency indicators, with illustrative examples of application to individual countries. It reviews work done by international agencies and national government in constructing meaningful energy efficiency indicators that help policy makers to assess changes in energy efficiency over time. Building on past OECD experience and best practices, and the knowledge of these countries' institutions, relevant sources of information to construct an energy indicator database are identified. A framework based on levels of hierarchy of indicators -- spanning from aggregate, macro level to disaggregated end-use level metrics -- is presented to help shape the understanding of assessing energy efficiency. In each sector of activity: industry, commercial, residential, agriculture and transport, indicators are presented and recommendations to distinguish the different factors affecting energy use are highlighted. The methodology booklet addresses specifically issues that are relevant to developing indicators where activity is a major factor driving energy demand. A companion spreadsheet tool is available upon request.

Sathaye, Jayant; Price, Lynn; McNeil, Michael; de la rue du Can, Stephane

2010-05-01

347

Environmental indices in irrigation management.  

PubMed

Irrigation management calls for objective criteria capable of representing the economy, reliability, and productivity of irrigation systems. These criteria must be compatible with long-term sustainability and conservation goals. The criteria representing the above goals are the economic effect of management on yield reduction, economic effect, and reliability referring to plant growth and operation of the network. In this study environmental indices are introduced to express the above criteria in quantitative terms. The inclusion of these indices at the farm and network level create a multicriteria framework for decision-making based on composite programming. An experimental study was conducted during the irrigation periods of 1989 and 1990 in Chania, Greece, concerning water delivered to 40 experimental plots, soil moisture content at the rootzone, and irrigation system operational failures. The data collected in real time were used for the calculation of the corresponding environmental indices. The variation in time and space is high and resulted in up to 62% of yield loss and low system performance (up to 7% of system temporal reliability). The study indicated that environmental indices could be incorporated to select alternatives and also to develop policies on water delivery. The final decision involves a trade-off analysis between cost of application and desired system performance. Measures of both primary objectives can be obtained using environmental indices that represent system operation aggregation at its basic levels (on farm and network). PMID:11494068

Manoliadis, O G

2001-10-01

348

Permanent makeup: indications and complications  

Microsoft Academic Search

Cosmetic tattoos, simulating makeup, have become very popular in the last decades; the technique of micropigmentation consists of implantation of pigment into the skin using a tattoo pen. The procedure can also be used to camouflage vitiligo, to mask scars, and as an adjunct to reconstructive surgery. Risks and complications include infections, allergic reactions, scarring, fanning, fading, and dissatisfaction about

Christa De Cuyper

2008-01-01

349

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

350

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

351

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

352

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

353

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

E-print Network

Wildlife habitat units by dam: lost and acquired Measured in habitat units. #12;IMPLEMENTATION INDICATORS Vegetation, Practice No-till & Conservation Tillage Systems, Upland Erosion & Sedimentation Control fish passing in-river and barged. From LGR to Bonneville and McNary to Bonneville Habitat Productivity

354

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

355

Relation between coronary calcium and major bleeding after percutaneous coronary intervention in acute coronary syndromes (from the Acute Catheterization and Urgent Intervention Triage Strategy and Harmonizing Outcomes With Revascularization and Stents in Acute Myocardial Infarction Trials).  

PubMed

Percutaneous coronary intervention (PCI) of calcified coronary lesions has been associated with increased rates of adverse ischemic events. However, the potential association between the presence and severity of calcific deposits and bleeding complications has yet to be investigated. Data from 6,855 patients with non-ST-segment elevation acute coronary syndrome (NSTEACS) or ST-segment elevation myocardial infarction (STEMI) treated with PCI were pooled from 2 large-scale randomized controlled trials-Acute Catheterization and Urgent Intervention Triage Strategy and Harmonizing Outcomes with Revascularization and Stents in Acute Myocardial Infarction. Patients were stratified into 3 groups according the grade of target PCI lesion calcium (none to mild, moderate, and severe) as assessed by an independent angiographic core laboratory. Thirty-day bleeding event rates were assessed and compared among groups. In the total cohort undergoing PCI, none-to-mild target lesion calcium was found in 4,665 patients (68.1%), moderate target lesion calcium in 1,788 patients (26.1%), and severe target lesion calcium in 402 patients (5.9%). The 30-day rates of non-coronary artery bypass graft surgery major bleeding increased significantly with each degree of coronary calcium (none to mild = 5.9%, moderate = 7.2%, and severe = 11.2%, p = 0.0003). By multivariable analysis, presence of severe calcium was an independent predictor of non-coronary artery bypass graft major bleeding after PCI (hazard ratio 1.54, 95% confidence interval 1.09 to 2.17, p = 0.01). In conclusion, in patients undergoing PCI for non-ST-segment elevation acute coronary syndrome and ST-segment elevation myocardial infarction, target lesion coronary calcium was an independent predictor of major bleeding events. Further studies are needed to elucidate mechanisms underlying this finding and to optimize treatment of this high-risk population. PMID:24440325

Généreux, Philippe; Madhavan, Mahesh V; Mintz, Gary S; Maehara, Akiko; Kirtane, Ajay J; Palmerini, Tullio; Tarigopula, Madhusudhan; McAndrew, Tom; Lansky, Alexandra J; Mehran, Roxana; Brener, Sorin J; Stone, Gregg W

2014-03-15

356

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

357

Critically Ill Cancer Patients: Indications  

E-print Network

Critically Ill Cancer Patients: Indications for Concurrent Palliative Care Although significant in the need for supportive services such as palliative care concomitantly with life-prolonging treatments), the approach of palliative care is to promote quality of life for patients and their families during life

von der Heydt, Rüdiger

358

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

359

America's Children: Key National Indicators  

E-print Network

Development http://www.nichd.nih.gov Maternal and Child Health Bureau http://www.mchb.hrsa.gov National CenterAmerica's Children: Key National Indicators of Well-Being, 2013 Federal Interagency Forum on Child Interagency Forum on Child and Family Statistics #12;Federal Interagency Forum on Child and Family Statistics

Rau, Don C.

360

The revised learning indicators scale  

Microsoft Academic Search

The measurement of learning, particularly cognitive learning, has been problematic in instructional communication research. In an effort to address some of the methodological problems, Frymier, Shulman, and Houser (1996) developed a learning indicators scale. Several of the items in this scale involved communication behaviors. In this study it was hypothesized that students with a predisposition to avoid communication would score

Ann Bainbridge Frymier; Marian L. Houser

1999-01-01

361

MARI: Motivator and Response Indicator  

Microsoft Academic Search

The theory of learning indicates that students would learn more efficiently if they were reinforced as soon as they made the correct response to a new concept. A simple device (MARI) for giving students immediate reinforcement within a class period was designed, built, and tested in actual classrooms. Not only would MARI reinforce the student when he made the correct

Otis E. Lancaster

1961-01-01

362

Indicators of Cotton Nitrogen Status  

Microsoft Academic Search

Nitrogen (N) deficiency limits cotton yields, while too much N causes excessive vegetative growth hurting yields, wastes expensive inputs, and causes environmental pollution. Diagnostic indicators are needed to assess cotton N status so that yields can be optimized as efficiently as possible. This study evaluated selected tools for predicting cotton responses to N fertilizer application. Petiole nitrate (NO3)-N (PNN) concentration

Bob Wiedenfeld; B. Webb Wallace; Frank Hons

2009-01-01

363

Multimetric indices: How many metrics?  

EPA Science Inventory

Multimetric indices (MMI?s) often include 5 to 15 metrics, each representing a different attribute of assemblage condition, such as species diversity, tolerant taxa, and nonnative taxa. Is there an optimal number of metrics for MMIs? To explore this question, I created 1000 9-met...

364

Community Health Status Indicators Project  

E-print Network

conditions for health in order to eliminate health disparities #12;Challenges · Acquire resources to addCommunity Health Status Indicators Project National Center for Environmental Health Environmental Health Tracking Branch Marilyn Metzler National Center for Chronic Disease Prevention and Health

365

Index of Hispanic Economic Indicators.  

ERIC Educational Resources Information Center

One in 10 Americans is of Hispanic origin, and Census projections show that in about 10 years, Hispanics will constitute the largest minority group in the United States and, by 2035, 1 in 5 Americans will be Hispanic. This survey of leading and lagging indicators of economic well-being shows that on several measures, Hispanics have demonstrated…

National Council of La Raza, Washington, DC.

366

Linguistic Indicators for Language Understanding  

E-print Network

Linguistic Indicators for Language Understanding: Using machine learning methods to combine corpus Science Columbia University New York, NY 10027 evs@cs.columbia.edu May 20, 1998 #12; Abstract Linguistics best put our understanding of linguistics to use in order to tap into the vast knowledge encoded

Fernandez, Thomas

367

Fall velocity indicator\\/viewer  

Microsoft Academic Search

A fall velocity indicator\\/viewer having a sampling compartment, a camera system, and an elongated tunnel for interconnecting the camera system to the sampling compartment is described. The camera system includes a video camera for continuously monitoring snowflakes as they naturally fall through a viewing area in the sampling compartment. The snowflakes are illuminated by a pair of strobe lights directly

R. O. Berthel; V. G. Plank; S. H. Jones; A. J. Matthews

1985-01-01

368

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

369

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

370

Pincushion correction techniques and their effects on calculated 3D positions and imaging geometries  

NASA Astrophysics Data System (ADS)

Two techniques for pincushion correction are evaluated based on their effect on calculation of the image geometry and 3D positions of object points. Images of a uniform wire mesh and a calibration phantom containing lead beads in its surface were acquired on the image intensifier TV systems in our catheterization labs. The radial mapping functions relating points in the original images and in the corrected images were determined using the mesh image. The undistorted mesh model was also used to determine and correct the distortions locally, i.e., for each square region between the mesh points. Thus, two corrected images were obtained. Images of the calibration phantom before and after correction were analyzed to determine the 3D position of the lead beads and the imaging geometry, using a calibration algorithm and the enhanced Metz-Fencil technique. In comparing the 3D positions calculated from the radially corrected and locally corrected images, the calculated 3D positions using the calibration technique vary by less than 0.6 mm in the x and y direction and less than 5.0 mm in the z direction. The uncorrected data yields differences of over 1 cm in the z direction. The 3D positions calculated using the enhanced Metz-Fencil technique appear to be more accurate when pincushion correction is applied.

Hoffmann, Kenneth R.; Chen, Yang; Esthappan, Jacqueline; Chen, Shiuh-Yung J.; Carroll, John D.

1996-04-01

371

Deep brain stimulation: indications and evidence.  

PubMed

Deep brain stimulation is a minimally invasive targeted neurosurgical intervention that enables structures deep in the brain to be stimulated electrically by an implanted pacemaker. It has become the treatment of choice for Parkinson's disease, refractory to, or complicated by, drug therapy. Its efficacy has been demonstrated robustly by randomized, controlled clinical trials, with multiple novel brain targets having been discovered in the last 20 years. Multifarious clinical indications for deep brain stimulation now exist, including dystonia and tremor in movement disorders; depression, obsessive-compulsive disorder and Tourette's syndrome in psychiatry; epilepsy, cluster headache and chronic pain, including pain from stroke, amputation, trigeminal neuralgia and multiple sclerosis. Current research argues for novel indications, including hypertension and orthostatic hypotension. The development, principles, indications and effectiveness of the technique are reviewed here. While deep brain stimulation is a standard and widely accepted treatment for Parkinson's disease after 20 years of experience, in chronic pain it remains restricted to a handful of experienced, specialist centers willing to publish outcomes despite its use for over 50 years. Reasons are reviewed and novel approaches to appraising clinical evidence in functional neurosurgery are suggested. PMID:17850194

Pereira, Erlick A C; Green, Alexander L; Nandi, Dipankar; Aziz, Tipu Z

2007-09-01

372

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

373

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

374

Science and Engineering Indicators 1996  

NSDL National Science Digital Library

In 1996 the National Science Board of the National Science Foundation made _Science and Engineering Indicators 1996_ available via the web. This is the twelfth in a series of biennial reports that NSF has produced. "In an era of increased emphasis on assessment of government and university performance and industrial benchmarking, _Science and Engineering Indicators_ provides decisionmakers and analysts in both the public and private sectors with a broad base of quantitative information and analysis regarding science, engineering, research, and education in the United States. Additionally, the Indicators report offers valuable comparative information on science and technology in other countries." The report contains chapters on elementary and secondary science and mathematics education, higher education in science and engineering, the science and engineering workforce, research and development, technology development and diffusion, and public attitudes and understanding. The final chapter, "The Economic and Social Significance of Scientific and Engineering Research," is a new development in the report. The report is available only in Adobe Acrobat (.PDF) format. A pointer to the free Acrobat Reader is provided.

1996-01-01

375

Airborne GMTI using MIMO techniques  

Microsoft Academic Search

The performance of a ground moving target indicator (GMTI) radar is strongly driven by the length of the radar aperture, as longer apertures enable lower minimum detectable velocity (MDV) and better target geolocation. Multiple-input multiple-output (MIMO) techniques can enable the use of long sparse array geometries while avoiding the adverse sidelobe effects typical of such arrays. In 2009 an experiment

Joshua Kantor; Shakti K. Davis

2010-01-01

376

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

377

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

378

[Videothoracoscopy, standard and uncommon indications].  

PubMed

The authors' communication deals with standard cases of the application of thoracoscopy in the diagnostics and treatment. On the Cardiological Clinic of the Medical School of the Charles University and University Hospital in Hradec Králové they performed in the period 2000-2004 153 out of 837 operations using thoracoscopy (18.3%) and 22 using video assisted thoracoscopy (2.6%). Apart from the standard indications the authors mention two rare thoracoscopies when extracting a foreign body from the thorax and lungs. PMID:17969982

Habal, P; Simek, J

2007-08-01

379

[Selective galactophorectomy: technic and indications].  

PubMed

The authors describe the way of operating the selective galactophorectomy and discuss the indications. Each pathological nipple discharge may reveal a carcinoma. The clinical characteristics of the discharge, the results of the cytology, of the mammography and the galactography help to come to a diagnosis. This can only be confirmed after a thorough histological examination of the involved duct. Selective galactophorectomy is a simple operation that hardly leaves any scars. According to the authors, this method has a real advantage to find the diagnosis and to treat pathological nipple discharge. PMID:4039097

Rossillon, D; Mouthuy, B; Mazy, G; De Coninck, A

1985-01-01

380

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

381

Developing clinical indication for multisite pacing.  

PubMed

The artificial activation of the heart modifies the mechanics of contraction and relaxation. While only little basic research has been addressed to this question, clinical observations showed that for hypertrophic as well as dilated cardiomyopathies appropriate pacing techniques can be useful. Pacing can influence the activation sequence. The spread out from a single site is slow, and so hypercontractility deminshed. With the use of multiple electrodes, two atrial and/or two ventricular, conduction delays in the atria or ventricles can be eliminated. Synchronisation of the cardiac activation has an anti-arrhythmic and positiv inotropic effect. This may lead to new indications for pacemakers or better to be named cardiac synchronisers. PMID:10590494

Kappenberger, L; Lyon, X; Cox, N; Girod, G; Schlaepfer, J

2000-01-01

382

Digital Image Enhancement of Indic Historical Manuscripts  

NASA Astrophysics Data System (ADS)

Historical documents in Indic scripts can be found on a wide range of media such as paper, palm leaves, and parchment. Palm leaves are believed to be one of the earliest forms of writing media and their use as writing material has been recorded in various parts of the world including India. Ancient palm leaf manuscripts relating to religion, science, medicine, astronomy are still available for reference today due to many ongoing efforts for preservation of ancient documents by libraries and universities around the world. These manuscripts typically last a few centuries but with time the leaves degrade and the writing becomes illegible. Image processing techniques can help enhance the images of these manuscripts so as to enable readability of the written text. In this chapter, we propose methods for enhancing digital images of palm leaf and other historical manuscripts. We approximate the background of a gray-scale image using piece-wise linear and nonlinear models. Normalization algorithms are used on the color channels of the palm leaf image to obtain an enhanced gray-scale image. Experimental results show significant improvement in readability. An adaptive local connectivity map is used to try to segment lines of text from the enhanced images with the objective of facilitating techniques such as keyword spotting or partial OCR and thereby making it possible to index these documents for retrieval from a digital library.

Shi, Zhixin; Setlur, Srirangaraj; Govindaraju, Venu

383

Noncontacting devices to indicate deflection and vibration of turbopump internal rotating parts  

NASA Technical Reports Server (NTRS)

Published report discusses feasibility of ultrasonic techniques; neutron techniques; X-radiography; optical devices; gamma ray devices; and conventional displacement sensors. Use of signal transmitters in place of slip rings indicated possible improvement and will be subject of futher study.

Hamilton, D. B.; Ensminger, D.; Grieser, D. R.; Plummer, A. M.; Saccocio, E. J.; Kissel, J. W.

1974-01-01

384

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

385

[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

386

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

387

The stent anchor technique for distal access through a large or giant aneurysm.  

PubMed

Large and giant aneurysms pose significant challenges to the endovascular techniques of coil embolization or parent vessel reconstruction. Many large aneurysms are wide-necked with bulbous domes and frequently require stent-assisted coiling or flow diversion to reconstruct and preserve flow through the parent artery. Often the wire must be looped in the dome before catheterization of the exiting portion of the parent vessel is possible. In addition, it can be challenging to obtain stable distal purchase of the microcatheter that will allow the loop to be withdrawn from the aneurysm without the entire microcatheter unwinding, resulting in herniation into the aneurysm or proximal vessels. The stent anchor technique, a novel method of obtaining distal purchase that allows straightening of the catheter loop within a large aneurysm for the purposes of stenting for vessel reconstruction across large or giant aneurysms, is presented. This technique may facilitate the use of new stent technologies in the treatment of large aneurysms that have traditionally been exceedingly difficult to treat via an endovascular approach. PMID:22544820

Fargen, Kyle M; Velat, Gregory J; Lawson, Matthew F; Hoh, Brian L; Mocco, J

2013-07-01

388

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

389

Moving target indication in the presence of radio frequency interference  

NASA Astrophysics Data System (ADS)

Moving target indication (MTI) is greatly complicated by the presence of radio frequency interference (RFI) which 'rings' the MTI filter causing false alarms. This effect is particularly important in radars with a limited number of coherent bursts on target. A subclutter RFI processing (SRP) technique has been developed to allow effective MTI processing in the presence of impulsive RFI. This technique does not have the sensitivity gap characteristic of conventional 'RFI detectors'. Thus, RFI induced false alarms can be effectively eliminating while still maintaining useful subclutter target visibility. The SRP technique has been analyzed by Monte Carlo simulation and by experiments conducted with recorded coherent radar signals.

Fong, E.; Walker, J. A.; Bath, W. G.

390

Indicating anthropogenic effectson urban water system - indicators and extension  

NASA Astrophysics Data System (ADS)

Urban water systems are polluted by diffusive and direct contribution of anthropogenic activities. Besides industrial contaminants like aromatic and chlorinated HC and other persistent organic compounds, the urban aquatic environment is increasingly polluted by low concentrated but high eco-toxic compounds as pharmaceuticals, fragrances, plasticizers which most have disrupt endocrine functions, and trace elements carried in by surface and sub-surface waste water and seeping processes. This contamination could have a longtime impact on the urban ecosystem and on the human health. The interdisciplinary project on risk assessment of water pollution was initiated to explore new methodologies for assessing human activities on the urban water system and processes among urban watersheds. In a first assumption we used a flow model concept with in- and output and surface water transport represented by the city of Halle, Germany, and the river Saale. The river Saale acts as surface water system collecting waste water inputs along the city traverse. We investigated the anthropogenic effect on the urban water system using the indicators hydrological parameters, compound specific pattern of complex organic substances and trace elements, isotopic signatures of water (H, O) and dissolved substances (sulfate, DIC, nitrate), pathogens, and microbiota. A first balance modeling showed that main ions are not very sensitive concerning the direct urban input into the river. Depending on the discharge of the river in high and low flood stages the load of dissolved matter has no specific urban effect. However, the concentration pattern of fragrances (tonalid, galaxolid) and endocrine disrupters (t-nonylphenol) point to a different pollution along the city traverse: downstream of the sewage plant a higher load was observed in comparison to the upstream passage. Furthermore, a degradation ability of fungi and bacteria occurred in the bank sediments could be detected in lab experiments concerning the fragrances, and endocrine disrupters (t-nonylphenol, phthalate). The Saale water samples contain components able to eco-toxic and immunomodulated effects as measured on the vitality and cytokine-secretion profile of human peripheral blood mononuclear cells (PBMC). Even fragrances caused such effects which are unknown so far. The study of assessing urban effects onto the water system is still under investigation.

Strauch, G.; Ufz-Team

2003-04-01

391

Selected instability indices in Europe  

NASA Astrophysics Data System (ADS)

A climatology of various parameters associated with severe weather and convective storms has been created for Europe that involves using radiosounding data collected at the University of Wyoming for the period from 1991 to 2005. The analysis is based on monthly means, frequency distributions of such parameters as convective available potential energy (CAPE), convective inhibition energy (CIN), KI - index, total totals index (TTI), and the severe weather threat index (SWEAT). Monthly average CAPE values exceeding 300 Jkg-1 are observed over the west Mediterranean Sea and the neighboring coastal countries. The similar seasonal cycle and spatial distributions exhibit CIN fields with summer monthly means above 100 Jkg-1 observed on the south part of the researched domain. The KI, TTI, and SWEAT indices, which assess both the lapse ratio between 850 and 500 hPa and low level humidity, show the privileged region (the Alpine area and the Carpathian Basin) with the highest instability conditions. Orography clearly plays an important role in this structure. Farther from this area, the monthly average decreases to the east, west, north, and south of the research domain. Ward’s procedure was applied to create objective regionalization according to instability conditions. This method tends to produce two regions with relatively different instability conditions and few subregions with similar conditions. The first region, covering the Alpine area, the west Mediterranean Sea, west Turkey and the southern Ukraine, is characterized by the highest instability. The rest of the investigated area is the second region with a more stable atmosphere.

Siedlecki, Mariusz

2009-04-01

392

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

393

Integrated Initiating Event Performance Indicators  

SciTech Connect

The U.S. Nuclear Regulatory Commission Industry Trends Program (ITP) collects and analyses industry-wide data, assesses the safety significance of results, and communicates results to Congress and other stakeholders. This paper outlines potential enhancements in the ITP to comprehensively cover the Initiating Events Cornerstone of Safety. Future work will address other cornerstones of safety. The proposed Tier 1 activity involves collecting data on ten categories of risk-significant initiating events, trending the results, and comparing early performance with prediction limits (allowable numbers of events, above which NRC action may occur). Tier 1 results would be used to monitor industry performance at the level of individual categories of initiating events. The proposed Tier 2 activity involves integrating the information for individual categories of initiating events into a single risk-based indicator, termed the Baseline Risk Index for Initiating Events or BRIIE. The BRIIE would be evaluated yearly and compared against a threshold. BRIIE results would be reported to Congress on a yearly basis.

S. A. Eide; Dale M. Rasmuson; Corwin L. Atwood

2005-09-01

394

Geochemical indicators of intrinsic bioremediation  

SciTech Connect

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 m-, p-xylene, and benzene. Ethylbenzene appears to degrade very slowly under anaerobic conditions present in the center of the plume. The rate and extent of biodegradation appears to be strongly influenced by the type and quantity of electron acceptors present in the aquifer. At the upgradient edge of the plume, nitrate, ferric iron, and oxygen are used as terminal electron acceptors during hydrocarbon biodegradation. The equivalent of 40 to 50 mg/l of hydrocarbon is degraded based on the increase in dissolved CO{sub 2} relative to background ground water. Immediately downgradient of the source area, sulfate and iron are the dominant electron acceptors. Toluene and o-xylene are rapidly removed in this region. Once the available oxygen, nitrate, and sulfate are consumed, biodegradation is limited and appears to be controlled by mixing and aerobic biodegradation at the plume fringes.

Borden, R.C. [North Carolina State Univ., Raleigh, NC (United States); Gomez, C.A. [American Agriculture Services, Cary, NC (United States); Becker, M.T. [Dames and Moore, Cranford, NJ (United States)

1995-03-01

395

Mute swans: Natural (?) environmental indicators  

USGS Publications Warehouse

The rapid expansion of the Chesapeake Bay's population of feral mute swans (Cygnus olar), coupled with a dramatic Bay-wide decline in submerged aquatic vegetation (SAV), has fueled much of the current debate surrounding the need for a management plan to protect the aquatic food resources that are critical to many species native to the Bay. Crucial to this decision process is a sound understanding of the ecological ramifications of having the year-round presence of a large, nonnative, aquatic herbivore on the Bay. Ultimately, this will require a quantitative assessment of the ecological harm currently posed by mute swans before a biologically defensible management strategy can be developed. Unfortunately, very little new information specific to the Bay's mute swan population has been gathered since Reese first studied them in the late 1960s and 1970s. While the debate over what to do about the rapidly expanding mute swan population continues, there is much that can be gained from study of this beautiful intruder. Several recent studies of the feeding habits of mute swans have shown that mutes can provide a unique barometer, or indicator, of environmental conditions. Because of their reliance on SAV as a primary food source, monitoring the density of swans utilizing a particular area can give some indication of the status of the area's grass beds. This phenomenon was clearly demonstrated during the summer of 1999 when there was a dramatic decline in the number of swans observed around the Eastern Neck NWR, a traditional population stronghold. The shift in bird use was precipitated by a rapid, large-scale collapse of the area's aquatic grass beds, possibly the result of a prolonged drought. During the winter of 2000/2001, a similar ecological assessment was conducted by comparing body weights of swans collected from Tangier Sound, an area with relatively abundant grass beds, and swans from the waters adjacent to Eastern Neck Island. Swans weights tended to reflect the conditions of their surroundings, with the Tangier Sound birds being slightly heavier at the onset of the breeding season. Interestingly, the birds at Eastern Neck showed a 1 kg decline in weight after dispersal from their wintering locations and entered the breeding season with noticeably less subcutaneous fat than the birds sampled in Tangier Sound. The fact that mute swans are nonmigratory and feed exclusively on benthic food items makes them an ideal organ-ism to monitor the degree of contamination of sediments within the Bay. In 1995, we compared the accumulation of metals by mute swans and other waterfowl and related it to metal concentrations in the sediments from the areas where the birds were collected. This study led to the development of an exposure model that more accurately assesses the risk of exposure to environmental contaminants through incidental ingestion of sediments, as opposed to the traditional assessment of contaminant accumulation through the food chain. This sediment exposure pathway was subsequently shown to be the primary route of exposure of swans to metals in risk assessments conducted at two Superfund sites.

Day, D.

2004-01-01

396

Community Health Status Indicators Project  

NSDL National Science Digital Library

The Health Resources and Services Administration (HRSA) of the Department of Health and Human Services (DHHS), in collaboration with the Association of State and Territorial Health Officials, the National Association of County and City Health Officials, and the Public Health Foundation, has recently unveiled a new Website that makes available health data for all 3,082 US counties. The Community Health Status Indicators (CHSI) Project has compiled pre-existing data from a variety of sources (no new data were collected) and created a report for each county. The reports offer data on a variety of topics, among them Population Characteristics, Leading Causes of Death, Vulnerable Populations, Environmental Health, and Access to Care. To access reports, users can either enter a county, or they can search for a county by selecting a state and/or a population range; searches can also be limited to those counties with the highest percentage of non-white or Hispanic inhabitants. Once a county is selected, reports can be downloaded in a viewable or printable form (both .pdf format). In addition, the data can be compared to that of "peer" counties, which share similar demographics. The site provides supplemental material to make the reports more understandable and usable, including a FAQ; a document on data sources, definitions, and notes; and a guide to using the reports. While the CHSI reports were created with public health professionals in mind, because the site is easy to navigate and the reports are readable, anyone with an interest in community health issues should find this a useful resource.

397

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

398

Short counseling techniques for busy family doctors.  

PubMed Central

OBJECTIVE: To introduce two short counseling skills for busy family doctors: the BATHE technique and the DIG technique. QUALITY OF EVIDENCE: The BATHE technique indicates five areas for questioning patients who require counseling: background, affect, trouble, handling, and empathy. No research on use of the technique has been published. The DIG technique is the author's modification of the BATHE technique. MAIN FINDINGS: While the efficacy of counseling in general was validated, more research on the effectiveness on these two techniques needs to be done. CONCLUSIONS: Since counseling is an integral part of family practice, family doctors will find these techniques useful. Each is easy to learn and takes less than 15 minutes to complete. PMID:9111987

Poon, V. H.

1997-01-01

399

NJIT Self Study Progress and Key Performance Indicators: A  

E-print Network

of social media; state-of-the-art measurement techniques · Milestone-driven time-line · Key documentsNJIT Self Study Progress and Key Performance Indicators: A Conversation with Provost Gatley Rapid ­ perception of writing ability; writing performance; ­ reading / critical thinking performance; ­ mathematics

Bieber, Michael

400

Preventing Web-Spoofing with Automatic Detecting Security Indicator  

Microsoft Academic Search

The anti-spoofing community has been intensively propos- ing new methods for defending against new spoofing techniques. It is still challenging for protecting na¨ ive users from advanced spoofing at- tacks. In this paper, we analyze the problems within those anti-spoofing mechanisms and propose a new Automatic Detecting Security Indicator (ADSI) scheme. This paper describe the trust model in ADSI in

Fang Qi; Feng Bao; Tieyan Li; Weijia Jia; Yongdong Wu

2006-01-01

401

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

402

Reflecting Metropolitan-Based Missions in Performance Indicator Reporting.  

ERIC Educational Resources Information Center

Describes the development of performance indicators at Wichita State University (Kansas) that reflect more accurately the institution's diverse, nontraditional constituencies and urban mission. Also presents results of their application and provides useful information for other institutions about considerations and techniques for developing…

Chambers, Stephen; Sanjeev, Arun P.

1997-01-01

403

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

404

Lipomatous hypertrophy of the interatrial septum: indication for surgery?  

Microsoft Academic Search

A fortuitous finding during open heart surgery of lipomatous hypertrophy of the interatrial septum is described in a 65-year old man with ischaemic heart complaints due to coronary artery disease and with premature ventricular contractions. An incision biopsy confirmed the diagnosis. The choice of treatment of lipomatous hypertrophy of the interatrial septum is controversial. Indications for surgery and surgical techniques

C. J. A. M. Zeebregts; A. G. Hensens; J. Timmermans; M. S. Pruszczynski; L. K. Lacquet

1997-01-01

405

Direct indication of particle size in fluidized beds  

NASA Technical Reports Server (NTRS)

Differential pressure measurements indicate particle size and particle size distribution in fluidized beds. The technique is based on the relationship between bed particle size and the intensity and frequency of fluctuations. By measuring the fluctuations, an estimate of average particle size of the fluid-bed material can be made.

Knudsen, I. E.; Olsen, W. F.

1969-01-01

406

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

407

[Laparoscopic partial nephrectomy: technique and outcomes].  

PubMed

The indication of laparoscopic partial nephrectomy (LPN) has evolved considerably, and the technique is approaching established status at our institution. Over the past 5 years, the senior author has performed more than 450 laparoscopic partial nephrectomies at the Cleveland Clinic. Herein we present our current technique, review contemporary data and oncological outcomes of LPN. PMID:16884101

Colombo, J R; Gill, I S

2006-05-01

408

JSEM: a framework for identifying and evaluating indicators.  

PubMed

There are two issues in indicator development that have not been adequately addressed: (1) how to select an optimal combination of potentially redundant indicators that together best represent an endpoint, given cost constraints; (2) how to identify and evaluate indicators when the endpoint is unmeasured. This paper presents an approach to identifying and evaluating combinations of indicators when the mathematical relationships between the indicators and an endpoint may not be quantified, a limitation common to many ecological assessments. The approach uses the framework of Structural Equation Modeling (SEM), which combines path analysis with measurement models, to formalize available information about potential indicators and to evaluate their potential adequacy for representing an endpoint. Unlike traditional applications of SEM which require data on all variables, our approach---judgement-based SEM (JSEM)--can utilize expert judgement regarding the strengths and shapes of indicator-endpoint relationships. JSEM is applied in two stages. First, a conceptual model that relates variables in a network of direct and indirect linkages is developed, and is used to identify indicators relevant to an endpoint. Second, an index of indicator strength--i.e., the strength of the relationship between the endpoint and a set of indicators--is calculated from estimates of correlation between the modeled variables, and is used to compare alternative sets of indicators. The second stage is most appropriate for large, long-term assessments. Although JSEM is not a statistical technique, basing JSEM on SEM provides a structure for validating the conceptual model and for relining the index of indicator strength as data become available. Our main objective is to contribute to a rigorous and consistent selection of indicators even when knowledge about the ability of indicators to represent an endpoint is limited to expert judgement. PMID:11281421

Hyman, J B; Leibowitz, S G

2001-02-01

409

RESEARCH Open Access Residents learning ultrasound-guided  

E-print Network

RESEARCH Open Access Residents learning ultrasound-guided catheterization are not sufficiently) technique is the recommended procedure for central venous catheterization (CVC). However, as ultrasound may technique in residents only learning the UG technique. Methods: During the first three months

Paris-Sud XI, Université de

410

[Protontherapy: basis, indications and new technologies].  

PubMed

With over 70,000 patients treated worldwide, protontherapy has an evolution on their clinical applications and technological developments. The ballistic advantage of the Bragg peak gives the possibility of getting a high conformation of the dose distribution to the target volume. Protontherapy has accumulated a considerable experience in the management of selected rare malignancies such as uveal melanomas and base of the skull chordomas and chondrosarcomas. The growing interest for exploring new and more common conditions, such as prostate, lung, liver, ENT, breast carcinomas, as well as the implementation of large pediatric programs advocated by many experts has been challenged up to now by the limited access to operational proton facilities, and by the relatively slow pace of technical developments in terms of ion production, beam shaping and modelling, on-line verification etc. One challenge today is to deliver dynamic techniques with intensity modulation in clinical facilities as a standard treatment. We concentrate in this paper on the evolution of clinical indications as well as the potentialities of new technological concepts on ion production, such as dielectric walls and laser-plasma interactions. While these concepts could sooner or later translate into prototypes of highly compact equipments that would make easier the implantation of cost-effective hospital-based facilities, the feasibility of their clinical use must still be proved. PMID:20603240

Mazal, A; Habrand, J-L; Delacroix, S; Datchary, J; Dendale, R; Desjardins, L; Ferrand, R; Malka, V; Fourquet, A

2010-07-01

411

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

412

49 CFR 230.68 - Speed indicators.  

Code of Federal Regulations, 2010 CFR

... 4 2010-10-01 2010-10-01 false Speed indicators. 230.68 Section 230.68 Transportation...MAINTENANCE STANDARDS Steam Locomotives and Tenders Speed Indicators § 230.68 Speed indicators. Steam locomotives that operate...

2010-10-01

413

49 CFR 230.68 - Speed indicators.  

Code of Federal Regulations, 2011 CFR

... 4 2011-10-01 2011-10-01 false Speed indicators. 230.68 Section 230.68 Transportation...MAINTENANCE STANDARDS Steam Locomotives and Tenders Speed Indicators § 230.68 Speed indicators. Steam locomotives that operate...

2011-10-01

414

Socio-economic Indicators for Development Planning  

ERIC Educational Resources Information Center

The broad sense of the term socio-economic is used when discussing indicators for national development planning while investigating a case study of India, selection of indicators, and development of indicators. (ND)

Rao, M. V. S.

1975-01-01

415

Pneumatic reduction: Advantages, risks and indications  

Microsoft Academic Search

Conclusion It is easy to say that a “new” controversial technique is either perfect or useless. Invariably the truth lies somewhere in between. Overall, we strongly believe the air enema technique to be quicker, safer and more effective than liquid enemas in our hands using the guidelines outlined above. However, which ever technique is used, the radiologist involved should take

D. A. Stringer; S. H. Ein

1990-01-01

416

Technique for lymphocyte transformation  

PubMed Central

Current techniques for lymphocyte transformation are evaluated and criticised. A simple technique, designed to meet these criticisms, is described in detail, with particular reference to lymphocyte separation and scoring methods. PMID:5697050

Pentycross, C. R.

1968-01-01

417

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

418

Heart transplantation in children: indications, complications, and management considerations.  

PubMed

Heart transplantation in children has increased in the last 5 years because of the availability of cyclosporine and improved surgical techniques. The primary indications for transplantation in children are dilated cardiomyopathy and complex congenital heart disease. The major complications affecting morbidity and mortality are infection and rejection. However, the development of accelerated coronary artery disease represents a serious complication limiting long-term survival. Successful rehabilitation and long-term survival depend on careful selection of potential recipients, application of stringent medical and psychosocial criteria, operative technique, comprehensive medical surveillance, and thorough and effective patient and family education. PMID:1556585

Muirhead, J

1992-04-01

419

Drilling technique for crystals  

NASA Technical Reports Server (NTRS)

Hole-drilling technique uses special crystal driller in which drill bit rotates at fixed position at speed of 30 rpm while crystal slowly advances toward drill. Technique has been successfully applied to crystal of Rochell salt, Triglycine sulfate, and N-acetyglycine. Technique limits heat buildup and reduces strain on crystal.

Hunter, T.; Miyagawa, I.

1977-01-01

420

Environmental performance indicators of organic spreading machines  

E-print Network

1 Environmental performance indicators of organic spreading machines M. Rousselet1 *, J. C. Roux1 to French spreading machines. The task consists in defining relevant indicators specifically for spreaders indicator before and after improvement on the machine. Keywords: Environmental Performance Indicator

Paris-Sud XI, Université de

421

DC KIDS COUNT e-Databook Indicators  

ERIC Educational Resources Information Center

This report presents indicators that are included in DC Action for Children's 2012 KIDS COUNT e-databook, their definitions and sources and the rationale for their selection. The indicators for DC KIDS COUNT represent a mix of traditional KIDS COUNT indicators of child well-being, such as the number of children living in poverty, and indicators of…

DC Action for Children, 2012

2012-01-01

422

Different Stability-Indicating Chromatographic Techniques for the Determination of Netobimin  

PubMed Central

Two simple, accurate, and sensitive methods were developed for the determination of netobimin in the presence of its degradation product. Method (A) was an HPLC method, performed on C18 column using acetonitrile/methanol/0.01?M potassium dihydrogen phosphate (56?:?14?:?30 by volume) as a mobile phase with a flow rate of 0.5?mL/min. Detection was performed at 254?nm. Method (B) was a TLC method, using silica gel 60 F254 plates; the optimized mobile phase was toluene/methanol/chloroform/ammonium hydroxide (5?:?4?:?6?:?0.1 by volume). The spots were scanned densitometrically at 346?nm. Linearity ranges were 1–10??g/mL for method (A) and 0.5–5??g/band for method (B), and the mean percentage recoveries were 99.3 ± 0.7% and 99.7 ± 0.7% for methods (A) and (B), respectively. The proposed methods were found to be specific for netobimin in the presence of up to 90% of its degradation product. Statistical comparison between the results obtained by these methods and the manufacturer method was done, and no significance difference was obtained. PMID:22567566

Ramadan, Nesrin K.; Mohamed, Afaf O.; Shawky, Sara E.; Salem, Maissa Y.

2012-01-01

423

Temporary abdominal wall closure in trauma patients: Indications, technique, and results  

Microsoft Academic Search

From 1988 to 1992 more than 5300 patients were admitted to a level I trauma center, with 36 of these patients requiring Silastic abdominal closure. Patients ages ranged from 13 to 75 years with a mean Injury Severity Score (ISS) of 30 (range 13–50). Nineteen patients (53%) suffered penetrating injuries, and 17 (47%) were victims of blunt trauma. Silastic closure

Thomas R. Howdieshell; Karen A. Yeh; Michael L. Hawkins; Jorge I. Cué

1995-01-01

424

Surgical management of peptic ulcer disease today – indication, technique and outcome  

Microsoft Academic Search

Aims: The current surgical management of peptic ulcer disease and its outcome have been reviewed. Results: Today, surgery for peptic ulcer disease is largely restricted to the treatment of complications. In peptic ulcer perforation,\\u000a a conservative treatment trial can be given in selected cases. If laparotomy is necessary, simple closure is sufficient in\\u000a the large majority of cases, and definitive

T. T. Zittel; E. C. Jehle; H. D. Becker

2000-01-01

425

Diffusion-weighted MR imaging of the gastrointestinal tract: technique, indications, and imaging findings.  

PubMed

Diffusion-weighted magnetic resonance (MR) imaging has emerged as an important tool in the diagnostic work-up of patients with bowel cancer and inflammatory conditions of the gastrointestinal tract. It functions on the basis of the microscopic motion of water molecules in a cellular environment and provides functional information about the water in body tissues. Diffusion-weighted imaging serves to complement conventional MR imaging, and its use may improve the accuracy of tumor detection and staging. It does not rely on the use of intravenous contrast material and may be performed in patients with renal impairment. Because it provides quantitative information about tissue cellularity, diffusion-weighted imaging may be used to distinguish between tissues with altered cellularity (eg, tumors and metastases) and normal tissues. Data from diffusion-weighted MR images enable the calculation of apparent diffusion coefficient (ADC) values, which provide useful information about response to treatment. Malignant gastrointestinal tract tumors have low ADC values, which increase after successful therapy. Diffusion-weighted imaging also plays a role in the evaluation of patients with inflammatory bowel disease and may help assess inflammation and complications, such as abscesses and fistulas. Quantitative measurements of signal intensity at diffusion-weighted imaging may help differentiate actively inflamed bowel from normal bowel, and ADC values provide useful information about disease activity and response to treatment. PMID:23674768

Sinha, Rakesh; Rajiah, Prabhakar; Ramachandran, Iswaran; Sanders, Scott; Murphy, Paul D

2013-05-01

426

Different techniques of static/dynamic guided implant surgery: modalities and indications.  

PubMed

For computer-guided surgery a static surgical guide is used that transfers the virtual implant position from computerized tomographic data to the surgical site. These guides are produced by computer-aided design/computer-assisted manufacture technology, such as stereolithography, or manually in a dental laboratory (using mechanical positioning devices or drilling machines). With computer-navigated surgery the position of the instruments in the surgical area is constantly displayed on a screen with a three-dimensional image of the patient. In this way, the system allows real-time transfer of the preoperative planning and visual feedback on the screen. A workflow of the different systems is presented in this review. PMID:25123770

Vercruyssen, Marjolein; Fortin, Thomas; Widmann, Gerlig; Jacobs, Reinhilde; Quirynen, Marc

2014-10-01

427

[Imaging of the adult sinusitis: indications for using conventional techniques, CT scan and MRI].  

PubMed

CT scanning has become the major investigation for sinusitis which is not acute, but chronic. It is a good diagnostic tool, but also allows follow-up assessment of progress, and preoperative evaluation of particular problems related to abnormalities or anatomical variations. MRI scanning has a lesser place, and is most useful in evaluating certain types of pseudo-tumorous sinus conditions, or excluding local complications (in the anterior cranial fossa or orbit). PMID:10544677

Dessi, P; Champsaur, P; Paris, J; Moulin, G

1999-01-01

428

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,...

429

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

430

Study of memory effects in international market indices  

NASA Astrophysics Data System (ADS)

Long term memory effects in stock market indices that represent internationally diversified stocks are analyzed in this paper and the results are compared with the S&P 500 index. The Hurst exponent and the Detrended fluctuation analysis (DFA) technique are the tools used for this analysis. The financial time-series data of these indices are tested with the Normalized Truncated Levy Flight to check whether the evolution of these indices is explained by the TLF. Some features that seem to be specific for international indices are discovered and briefly discussed. In particular, a potential investor seems to be faced with new investment opportunities in emerging markets during and especially after a crisis.

Mariani, M. C.; Florescu, I.; Beccar Varela, M. P.; Ncheuguim, E.

2010-04-01

431

Intrathoracic blood volume measurement by contrast magnetic resonance imaging  

Microsoft Academic Search

The intra-thoracic blood volume (ITBV) is a cardiovascular pa- rameter related to the cardiac preload and left ventricular func- tion. Its assessment is, therefore, important for diagnosis and follow-up of several cardiovascular dysfunctions. Nowadays, the ITBV can be accurately measured only by invasive indicator dilution techniques, which require a double catheterization of the patient. In this study, a novel technique

M. Mischi; H. C. M. van den Bosch; J. A. den Boer; J. Verwoerd; R. J. E. Grouls; C. H. Peels; H. H. M. Korsten

2009-01-01

432

Toe-to-hand transfer: Evolving Indications and Relevant Outcomes  

PubMed Central

In the late 19th century, the first toe to hand transfer was performed in Vienna, Switzerland as a staged procedure by Nicolandi.(1) Since that time, the advent of microsurgery has revolutionized toe to hand transfers. In 1966, Buncke performed the first microvascular toe to thumb transfer in a rhesus monkey.(2) The first toe to thumb transfer using microsurgical techniques in humans was performed by Cobbett in 1969, followed shortly thereafter by the first transfer of a second toe to the thumb position.(3,4) Today, due to expanding microsurgical techniques and surgeon innovation, the indications and techniques for toe-to-hand transfer procedures continue to evolve and now encompass patients with a variety of acquired and congenital hand defects.(5) PMID:23790426

Waljee, Jennifer F.; Chung, Kevin C.

2014-01-01

433

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

434

Performance indicator report for operation surety  

SciTech Connect

This report for the month of May, 1991, summarizes performance indicators which are being monitored at the Pinellas Plant. These indicators range over maintenance related items, radiation incidents, overtime hours, hazardous spills, discharges of gases and liquids, etc.

NONE

1991-05-01

435

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...

436

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...

437

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...

438

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

439

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

440

Modern key agreement techniques  

Microsoft Academic Search

Abstract: We present a survey of modern key agreement techniques, and discuss distinguishing characteristics,including identity (entity) authentication, implicit key authentication, key confirmation, andkey freshness.

Rainer A. Rueppel; Paul C. Van Oorschot

1994-01-01

441

Optical Techniques Nanomicroscopy  

E-print Network

Optical Techniques Nanomicroscopy Drug Development Medicinal Plants Sessions Nanomicroscopy Medical Biophysics Structure and Mechanics of F nction Medicinal Plants Nano Medicine Drug Encapsulation and Deli er

Fischer, Wolfgang

442

Beyond Test Scores: Leading Indicators for Education  

ERIC Educational Resources Information Center

"Leading indicators"--indicators that provide early signals of progress toward academic achievement--enable education leaders, especially at the central office level in a school district, to make more strategic and less reactive decisions about services and supports to improve student learning. These indicators are a way of viewing and using data…

Foley, Ellen; Mishook, Jacob; Thompson, Joanne; Kubiak, Michael; Supovitz, Jonathan; Rhude-Faust, Mary Kaye

2008-01-01

443

Ocean indicators Current knowledge and future directions  

E-print Network

Ocean indicators Current knowledge and future directions Brian Burke, NOAA Fisheries Brian.Burke@noaa.gov #12;· Review of ocean indicator work · Forecasting · Indicator gaps and the importance of mechanistic understanding · Plugging in to management #12;Haeseker et al. 2012 Ocean survival is low and variable #12;-10 -5

444

Towards diagnostic biotic indices for river macroinvertebrates  

Microsoft Academic Search

The construction of biotic indices that use macroinvertebratesto assess pollution and other anthropogenic disturbances ofrivers and streams often requires that each taxon be assigned anumber indicating its level of sensitivity. A problem inconstructing such indices is that individual taxa may varyquite widely in sensivity, depending on the nature of theparticular disturbance. One possible means of overcoming thisproblem is to construct

Bruce C. Chessman; Paul K. McEvoy

1997-01-01

445

Choosing Aggregation Rules for Composite Indicators  

ERIC Educational Resources Information Center

From a formal point of view, a composite indicator is an aggregate of all dimensions, objectives, individual indicators and variables used for its construction. This implies that what defines a composite indicator is the set of properties underlying its mathematical aggregation convention. In this article, I try to revise the theoretical debate on…

Munda, Giuseppe

2012-01-01

446

Surgical management of cervical and lumbosacral radiculopathies: indications and outcomes.  

PubMed

The most common indication for the surgical management of compressive cervical and lumbar radiculopathies is a herniated disc in a patient who has not improved with conservative management. Even though a herniated disk is a common condition, it is paramount that the examining physician considers an extensive differential diagnosis when evaluating radiculopathies, especially in patients with a history of cancer, multiple medical illnesses, secondary gain, or advanced age. This consideration has become even more important as imaging studies have improved, because previously undetected degenerative changes are now clearly visualized on MRI and CT scans. These improved studies, however, do not replace a thorough history and physical examination, because a patient's signs and symptoms may not correlate with the radiographic findings. The authors have presented a series of surgical techniques used to manage cervical and lumbar discectomies to the most recent "minimally invasive" percutaneous techniques. Much debate and controversy surround these more recent techniques. There is no controversy, however, in stating that achieving good outcomes, regardless of technique, is predicated on proper patient selection. Because patient selection is the most important predictor of outcome and because serious complications have been reported with "minimally invasive" percutaneous procedures, the authors continue to advocate the proven traditional surgical approaches until prospective, randomized studies demonstrate a clear benefit to using alternative techniques. PMID:12380556

Storm, Phillip B; Chou, Dean; Tamargo, Rafael J

2002-08-01

447

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 suppor