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1

Laparoscopic-Assisted Lumboperitoneal Shunt: A Simplified Technique  

PubMed Central

Objectives: Lumboperitoneal shunt has been advocated as a better alternative to ventriculoperitoneal shunt in communicating hydrocephalus. To minimize the morbidity of subcutaneous tunneling or an open abdominal wound, we developed a simplified technique for laparoscopy-assisted placement of lumboperitoneal shunts. Methods: Patients deemed candidates for lumboperitoneal shunts underwent laparoscopy-assisted lumboperitoneal shunt placement. Using a Tuohy needle, the neurosurgeon obtains access to the lumbar subthecal space. Simultaneously, the laparoscopist obtains access to the peritoneal cavity with two 5-mm ports for the take down of the descending colon, clearing the way for the passage of the shunt passer from the back into the peritoneal cavity. Results: Over the last 5 years, 45 patients have undergone laparoscopy-assisted lumboperitoneal shunt placement. Patients have been followed with neuropsychiatric examinations, imaging studies, and repeated neurological examinations. No complications related to the laparoscopy have occurred. Neurosurgical complications included postural headaches caused by overdrainage in 4 patients requiring laparoscopic modification of the shunt slit and in 1 patient with acquired Arnold-Chiari I malformation. Conclusion: Laparoscopy-assisted lumboperitoneal shunt offers many advantages over percutaneous ventriculoperitoneal or laparoscopic transabdominal lumboperitoneal shunts. The procedure can be performed in less than 30 minutes by any practicing laparoscopist. PMID:11719975

Kirsch, Wolff; Robles, Antonio

2001-01-01

2

Acquired Chiari I Malformation and Syringomyelia after Valveless Lumboperitoneal Shunt in Infancy  

Microsoft Academic Search

The authors present the case of a 13-year-old boy who experienced frequent disabling episodes of typical postural induced headaches, which revealed a Chiari I malformation, syringomyelia and cervical spinal cord edema. This boy had received a valveless lumboperitoneal (LP) shunt at the age of 18 months for macrocephaly. At this time, cranial CT scan showed moderate enlargement of the subarachnoid

Laurent Riffaud; Carolina Moughty; Pierre-Louis Henaux; Claire Haegelen; Xavier Morandi

2008-01-01

3

A comparison of lumboperitoneal and ventriculoperitoneal shunting for idiopathic intracranial hypertension: an analysis of economic impact and complications using the Nationwide Inpatient Sample.  

PubMed

Object Complications following lumboperitoneal (LP) shunting have been reported in 18% to 85% of cases. The need for multiple revision surgeries, development of iatrogenic Chiari malformation, and frequent wound complications have prompted many to abandon this procedure altogether for the treatment of idiopathic benign intracranial hypertension (pseudotumor cerebri), in favor of ventriculoperitoneal (VP) shunting. A direct comparison of the complication rates and health care charges between first-choice LP versus VP shunting is presented. Methods The Nationwide Inpatient Sample database was queried for all patients with the diagnosis of benign intracranial hypertension (International Classification of Diseases, Ninth Revision, code 348.2) from 2005 to 2009. These data were stratified by operative intervention, with demographic and hospitalization charge data generated for each. Results A weighted sample of 4480 patients was identified as having the diagnosis of idiopathic intracranial hypertension (IIH), with 2505 undergoing first-time VP shunt placement and 1754 undergoing initial LP shunt placement. Revision surgery occurred in 3.9% of admissions (n = 98) for VP shunts and in 7.0% of admissions (n = 123) for LP shunts (p < 0.0001). Ventriculoperitoneal shunts were placed at teaching institutions in 83.8% of cases, compared with only 77.3% of first-time LP shunts (p < 0.0001). Mean hospital length of stay (LOS) significantly differed between primary VP (3 days) and primary LP shunt procedures (4 days, p < 0.0001). The summed charges for the revisions of 92 VP shunts ($3,453,956) and those of the 6 VP shunt removals ($272,484) totaled $3,726,352 over 5 years for the study population. The summed charges for revision of 70 LP shunts ($2,229,430) and those of the 53 LP shunt removals ($3,125,569) totaled $5,408,679 over 5 years for the study population. Conclusions The presented results appear to call into question the selection of LP shunt placement as primary treatment for IIH, as this procedure is associated with a significantly greater likelihood of need for shunt revision, increased LOS, and greater overall charges to the health care system. PMID:25363432

Menger, Richard P; Connor, David E; Thakur, Jai Deep; Sonig, Ashish; Smith, Elainea; Guthikonda, Bharat; Nanda, Anil

2014-11-01

4

Spinal intradural hematoma and permanent paraparesis after a lumboperitoneal shunt operation: an unusual complication.  

PubMed

Pseudotumor cerebri is a condition of increased intracranial pressure in the absence of clinical, laboratory or radiological pathology. Spinal intradural hematoma formation after lumboperitoneal shunt (LPS) implantation is very rare, but it can cause sudden and serious deterioration. In this report, we present a patient who developed an intradural hematoma following LPS operation. A 27-year-old male patient suffering from headaches and progressive vision loss was diagnosed with pseudotumor cerebri. He underwent LPS operation in January 2009. Four hours after the operation, he developed urinary and fecal incontinence with paraparesis (1/5). Lumbar magnetic resonance imaging identified an intradural hematoma at the level of L2-L3, and he was reoperated. The intradural hematoma was removed. Physical therapy was started because of paraparesis. Two months later, the patient's muscle strength had increased to 3/5. Surgeons must remember that, LPS implantation can cause a spinal intradural hematoma in a small percentage of patients, with catastrophic results. PMID:25187872

Basaran, Recep; Efendioglu, Mustafa; Bolukbasi, Fatih Han; Aslan, Sahin; Isik, Nejat; Kaner, Tuncay

2014-08-01

5

Frameless Stereotactic Ventricular Shunt Placement for Idiopathic Intracranial Hypertension  

Microsoft Academic Search

Introduction: Cerebrospinal fluid (CSF) shunting effectively reverses symptoms of idiopathic intracranial hypertension (IIH). Lumboperitoneal (LP) shunts have traditionally been used in patients with IIH due to a frequently undersized ventricular system. However, the advent of image-guided stereotaxis has enabled effective ventricular catheter placement in patients with IIH. We describe the first large series of frameless stereotactic ventriculoperitoneal (VP) shunting for

Graeme F. Woodworth; Matthew J. McGirt; Peter Elfert; Daniel M. Sciubba; Daniele Rigamonti

2005-01-01

6

Lumbar peritoneal shunt.  

PubMed

A lumbar peritoneal (LP) shunt is a technique of cerebrospinal fluid (CSF) diversion from the lumbar thecal sac to the peritoneal cavity. It is indicated under a large number of conditions such as communicating hydrocephalus, idiopathic intracranial hypertension, normal pressure hydrocephalus, spinal and cranial CSF leaks, pseudomeningoceles, slit ventricle syndrome, growing skull fractures which are difficult to treat by conventional methods (when dural defect extends deep in the cranial base or across venous sinuses and in recurrent cases after conventional surgery), raised intracranial pressure following chronic meningitis, persistent bulging of craniotomy site after operations for intracranial tumors or head trauma, syringomyelia and failed endoscopic third ventriculostomy with a patent stoma. In spite of the large number of indications of this shunt and being reasonably good, safe, and effective, very few reports about the LP shunt exist in the literature. This procedure did not get its due importance due to some initial negative reports. This review article is based on search on Google and PubMed. This article is aimed to review indications, complications, results, and comparison of the LP shunt with the commonly practiced ventriculoperitoneal (VP) shunt. Shunt blocks, infections, CSF leaks, overdrainage and acquired Chiari malformation (ACM) are some of the complications of the LP shunt. Early diagnosis of overdrainage complications and ACM as well as timely appropriate treatment especially by programmable shunts could decrease morbidity. Majority of recent reports suggest that a LP shunt is a better alternative to the VP shunt in communicating hydrocephalus. It has an advantage over the VP shunt of being completely extracranial and can be used under conditions other than hydrocephalus when the ventricles are normal sized or chinked. More publications are required to establish its usefulness in the treatment of wide variety of indications. PMID:20508332

Yadav, Yad R; Parihar, Vijay; Sinha, Mallika

2010-01-01

7

Pseudotumor cerebri in a child receiving peritoneal dialysis: recovery of vision after lumbo-pleural shunt  

PubMed Central

A 9-year-old boy with end-stage renal disease who was receiving continuous ambulatory peritoneal dialysis (CAPD) presented with acute visual loss and was found to have papilledema. Neuroimaging and cerebrospinal fluid (CSF) analysis were normal. The lumbar puncture opening pressure was 290 mm of water so the diagnosis of pseudotumor cerebri (PTC) was entertained. Medical treatment was not an option because of renal insufficiency; neither was lumbo-peritoneal shunting, because of the peritoneal dialysis. After a lumbo-pleural shunt was placed, there was marked improvement in symptoms. The lumbo-pleural shunt is a reasonable option for treatment for PTC in patients on CAPD who require a CSF divergence procedure. PMID:21911996

Alrifai, Muhammad Talal; Al Naji, Foad; Alamir, Abdulrahman; Russell, Neville

2011-01-01

8

Lymphovenous shunts in man  

PubMed Central

Lymphovenous shunts have been detected in patients by lymphography with Ultrafluid Lipiodol. No shunts were found in patients with normal lymphatic systems. They were found in patients with lymphoedema, with lymph nodes involved by malignant disease, and in patients who had had surgical interruption of lymphatic pathways, either vessels or nodes. The total incidence of lymphovenous shunts in 700 lymphographic studies was 2·3%. The incidence in the various pathological groups was highest in those with obvious lymph node involvement. In certain situations, particularly primary lymphoedema, the role of a lymphovenous shunt appears favourable to prognosis. In other situations a deleterious effect may be produced. ImagesFig. 1Fig. 2Fig. 3Fig. 4Fig. 5 PMID:5356544

Edwards, J. M.; Kinmonth, J. B.

1969-01-01

9

residue and shunting pinholes  

NASA Astrophysics Data System (ADS)

The present work considers two observable phenomena through the experimental fabrication and electrical characterization of the rf-sputtered CdS/CdTe thin film solar cells that extremely reduce the overall conversion efficiency of the device: CdCl2 residue on the surface of the semiconductor and shunting pinholes. The former happens through nonuniform treatment of the As-deposited solar cells before annealing at high temperature and the latter occurs by shunting pinholes when the cell surface is shunted by defects, wire-like pathways or scratches on the metallic back contact caused from the external contacts. Such physical problems may be quite common in the experimental activities and reduce the performance down to 4-5 % which leads to dismantle the device despite its precise fabrication. We present our electrical characterization on the samples that received wet CdCl2 surface treatment (uniform or nonuniform) and are damaged by the pinholes.

Gorji, Nima E.

2014-09-01

10

CSF shunt infections in children  

Microsoft Academic Search

Summary The incidence of shunt infections and possible risk factors was investigated by chart analysis. From 1986 to 1989 350 shunt procedures were performed including 273 ventriculoperitoneal shunts and 75 ventriculoatrial shunts. Twenty-eight infectious episodes (8%) occurred in 25 patients during a median follow-up time of 20 months. For 204 patients the follow-up time could be prolonged until September 1992.

U. Kontny; B. Höfling; P. Gutjahr; H. J. Schmitt; D. Voth; M. Schwarz

1993-01-01

11

Peritoneovenous shunts palliate malignant ascites.  

PubMed

Fifty-five peritoneovenous shunts (PVS) were implanted in 45 patients (29 LeVeen and 26 Denver shunts). Seventy-five percent of patients experienced relief of symptoms referable to their ascites. The mean survival time post-shunt placement was 33 weeks; however, considerable variation was noted in survival times for the various tumor types (pancreas 7 weeks, ovary 71 weeks). Significant alterations in coagulation parameters consistent with subclinical disseminated intervascular coagulation (DIC) were present in all patients with functioning shunts. These coagulation changes have proven reliable indicators of shunt patency. Shunt revision was necessary in 18 percent of patients. No significant difference in shunt patency was detected when Denver and LeVeen shunts were compared. This experience indicates that PVS offers effective palliation without undue morbidity for malignant ascites. The best results can be expected in those patients with ovarian and breast primary tumors. Because of the short time from onset of disabling ascites until death, PVS is not indicated in the majority of patients with pancreatic cancer. PMID:2480068

Edney, J A; Hill, A; Armstrong, D

1989-12-01

12

Percutaneous Placement and Management of Peritoneovenous Shunts  

PubMed Central

Peritoneovenous shunts are used in the treatment of recurrent ascites or recurrent pleural effusions. Generally speaking, the shunts allow passage of ascites or pleural effusions (by either passive or active means) back into the central venous system. The most recent development in peritoneovenous shunts, known as the Denver Shunt, is a modification of a shunt developed for the treatment of hydrocephalus. In recent years, the Denver shunt has been placed by interventional radiologists. It is used to treat both cirrhotic and malignant effusions in the peritoneal and pleural cavities. Reported complications of the shunt are shunt occlusion, infection, post-shunt coagulopathy, deep vein thrombosis, catheter breakage, and leaks. This article discusses the technical aspects related to the percutaneous placement and maintenance of the Denver Shunt. PMID:23729983

Martin, Louis G.

2012-01-01

13

Quadrupole shunt experiments at SPEAR  

SciTech Connect

As part of a program to align and stabilize the SPEAR storage ring, a switchable shunt resistor was installed on each quadrupole to bypass a small percentage of the magnet current. The impact of a quadrupole shunt is to move the electron beam orbit in proportion to the off-axis beam position at the quadrupole, and to shift the betatron tune. Initially, quadrupole shunts in SPEAR were used to position the electron beam in the center of the quadrupoles. This provided readback offsets for nearby beam position monitors, and helped to steer the photon beams with low-amplitude corrector currents. The shunt-induced tune shift measurements were then processed in MAD to derive a lattice model.

Corbett, W.J.; Hettel, R.O.; Nuhn, H.-D.

1996-05-01

14

Hypergraphic LP Relaxations for Steiner Trees  

NASA Astrophysics Data System (ADS)

We investigate hypergraphic LP relaxations for the Steiner tree problem, primarily the partition LP relaxation introduced by Könemann et al. [Math. Programming, 2009]. Specifically, we are interested in proving upper bounds on the integrality gap of this LP, and studying its relation to other linear relaxations. Our results are the following.

Chakrabarty, Deeparnab; Könemann, Jochen; Pritchard, David

15

WEIGHTED Lp -BOUNDEDNESS OF FOURIER SERIES  

E-print Network

Jacobi weight on the interval [-1, 1] and, for each function f, let Snf denote the n-th partial sum with respect to dµ. The study of the boundedness Snf Lp(updµ) C f Lp(vpdµ), (1) where u(x) = (1 - x)a (1 + x, . . . , N) (3) and A a, B b, Gi gi (4) hold, then C > 0 such that Snf Lp(updµ) C f Lp(vpdµ) f Lp (vp dµ

Pérez, Mario

16

30 CFR 56.6401 - Shunting.  

Code of Federal Regulations, 2010 CFR

...AND NONMETAL MINES Explosives Electric Blasting § 56.6401 Shunting. Except during testing— (a) Electric detonators shall be kept shunted until connected to the blasting line or wired into a blasting round; (b) Wired rounds shall...

2010-07-01

17

Appendicitis in Children with a Ventriculoperitoneal Shunt  

Microsoft Academic Search

The presentation of an acute abdomen in children with a ventriculoperitoneal shunt requires skilful diagnostic workup. Apart from complications caused by the shunt, primary abdominal pathological conditions must be taken into consideration, particularly in the older child. A series of 6 children with a ventriculoperitoneal shunt had to be treated surgically for appendicitis. Their medical records were analyzed retrospectively. Despite

W. Pumberger; M. Löbl; W. Geissler

1998-01-01

18

Ventriculoperitoneal shunt infection after bladder augmentation  

Microsoft Academic Search

Objectives. To examine the incidence of postoperative ventriculoperitoneal shunt infections in patients after augmentation cystoplasty.Methods. We retrospectively reviewed the charts of 21 patients with a ventriculoperitoneal shunt who had bladder augmentation (18 ileal and 3 ileocecal) with attention to the preoperative urine culture, perioperative antibiotics, and the length of time drains were maintained. The abdominal end of all shunts was

Kirk Pinto; Gerald R Jerkins; H. Norman Noe

1999-01-01

19

POWER HARVESTING PIEZOELECTRIC SHUNT DAMPING 1  

E-print Network

POWER HARVESTING PIEZOELECTRIC SHUNT DAMPING 1 A. J. Fleming ¤ S. O. R. Moheimani ¤ ¤ School piezoelectric transducer. Typical shunt networks require inductance values of up to thousands of Henries introduces an e±cient, light weight, and small-in-size technique for implementing piezoelectric shunt damping

Fleming, Andrew J.

20

Hypergraphic LP Relaxations for Steiner Trees  

E-print Network

We investigate the partition LP formulation for Steiner trees and extend the technique of uncrossing, usually applied to set systems, to families of partitions. Using this technique we further our understanding of LP relaxations for the Steiner tree problem. Firstly, we show that basic feasible solutions to the partition LP formulation have sparse support. Subsequently, we use the partition uncrossing technique to compare the partition LP formulation with the well-known bidirected cut relaxation and Warme's subtour LP formulation for the Steiner tree problem; we show that the latter is equivalent to the partition formulation, while the former is equivalent to both in quasi-bipartite graphs (graphs where the Steiner vertices form a stable set). Finally, using the uncrossing technique we show improved upper bounds on the integrality gaps of these LPs on uniform and 3-restricted quasi-bipartite graphs.

Chakrabarty, Deeparnab; Pritchard, David

2009-01-01

21

77 FR 58366 - Dominion South Pipeline Company, L.P.; Gulf Shore Energy Partners, LP; Notice of Applications  

Federal Register 2010, 2011, 2012, 2013

...Dominion South Pipeline Company, L.P.; Gulf Shore Energy Partners, LP; Notice of Applications Take...requesting authorization to abandon by sale to Gulf Shore Energy Partners, LP (Gulf Shore) certain facilities in Matagorday County,...

2012-09-20

22

Arterioportal shunts on dynamic computed tomography  

SciTech Connect

Thirty-two patients, 20 with hepatocelluar carcinoma and 12 with liver cirrhosis, were examined by dynamic computed tomography (CT) using intravenous bolus injection of contrast medium and by celiac angiography. Dynamic CT disclosed arterioportal shunting in four cases of hepatocellular carcinoma and in one of cirrhosis. In three of the former, the arterioportal shunt was adjacent to a mass lesion on CT, suggesting tumor invasion into the portal branch. In one with hepatocellular carcinoma, the shunt was remote from the mass. In the case with cirrhosis, there was no mass. In these last two cases, the shunt might have been caused by prior percutaneous needle puncture. In another case of hepatocellular carcinoma, celiac angiography but not CT demonstrated an arterioportal shunt. Thus, dynamic CT was diagnostic in five of six cases of arteriographically demonstrated arterioportal shunts.

Nakayama, T.; Hiyama, Y.; Ohnishi, K.; Tsuchiya, S.; Kohno, K.; Nakajima, Y.; Okuda, K.

1983-05-01

23

Unusual complications of ventriculo peritoneal shunt surgery  

PubMed Central

Ventriculo peritoneal (VP) shunt surgery is one of the common neurosurgical procedures employed in the management of hydrocephalus. Numerous complications related to this procedure are reported in the literature. Peritoneal catheter-related complications are the usual causes of the shunt malfunction. We report three unusual cases of peritoneal shunt catheter migration in children. Two cases are of anal and one vaginal extrusion. Possible mechanisms of migration and management strategies were discussed. PMID:23189000

Teegala, Ramesh; Kota, Laxmi Prasanna

2012-01-01

24

Appendicitis in children with a ventriculoperitoneal shunt.  

PubMed

The presentation of an acute abdomen in children with a ventriculoperitoneal shunt requires skillful diagnostic workup. Apart from complications caused by the shunt, primary abdominal pathological conditions must be taken into consideration, particularly in the older child. A series of 6 children with a ventriculoperitoneal shunt had to be treated surgically for appendicitis. Their medical records were analyzed retrospectively. Despite difficulties with the initial diagnosis, the time from admission to final diagnosis and operation was relatively short. An accurate history, careful evaluation of the clinical signs and, above all, ultrasound of the abdomen were helpful in decision making. During the operation the shunts were left in place. Only 1 patient developed a cerebrospinal fluid pseudocyst in the early postoperative period, which made a conversion into a ventriculoatrial shunt necessary. No ascending infection occurred, even when the abdominal tip of the shunt came in close contact with the focus of inflammation. An acute abdomen due to shunt infection should be managed conservatively and by removal of the shunt from the abdomen, thus avoiding an unnecessary laparotomy. On the other hand, a primary intraabdominal disease requires surgical treatment, during which the shunt system can be left in place. PMID:9693325

Pumberger, W; Löbl, M; Geissler, W

1998-01-01

25

Percutaneous Portosystemic Shunts: TIPS and Beyond.  

PubMed

Percutaneous interventions for portal hypertension have been available since the 1990s. Over time, improved technology-including covered stent grafts-and clinical understanding has expanded the available procedures for percutaneous portal decompression. While transjugular intrahepatic portosystemic shunt creation is the most commonly cited percutaneous intervention, direct intrahepatic portocaval shunt and percutaneous mesocaval shunt creation are important alternatives with specific advantages and applications. This article reviews contemporary, minimally invasive interventional approaches to percutaneous portosystemic shunt creation in terms of procedure rationale, patient selection, interventional technique, and technical outcomes. PMID:25177082

Casadaban, Leigh C; Gaba, Ron C

2014-09-01

26

Decomposition Methods for Large Scale LP Decoding  

E-print Network

When binary linear error-correcting codes are used over symmetric channels, a relaxed ver- sion of the maximum likelihood ... propagation (BP) decoders, but with significantly stronger theoretical guarantees. However, LP ...... equation (

2012-04-02

27

21 CFR 874.3850 - Endolymphatic shunt tube with valve.  

Code of Federal Regulations, 2010 CFR

...Endolymphatic shunt tube with valve. 874.3850 Section...AND THROAT DEVICES Prosthetic Devices § 874.3850 Endolymphatic shunt tube with valve. (a) Identification...endolymphatic shunt tube with valve is a device that...

2010-04-01

28

Kernel Lattice Parallelism (KeLP)  

NSDL National Science Digital Library

KeLP (Kernel Lattice Parallelism) is a framework for implementing portable scientific applications on distributed memory parallel computers. It is intended for applications with special needs, in particular, that adapt to data-dependent or hardware dependent conditions at run time. KeLP is currently used in full-scale applications including subsurface modeling, turbulence studies, and first principles simulation of real materials.

29

Sonographic localization of a nonpalpable shunt: Ultrasound-assisted ventricular shunt tap  

PubMed Central

Background: Patients frequently present to the emergency department (ED) for evaluation of cerebrospinal fluid (CSF) shunt malfunction, often requiring urgent management. A typical evaluation in the emergency room setting includes a thorough history and physical examination, noncontrasted head computed tomography (CT), shunt series, and occasionally a ventricular shunt tap. Case Description: We present the case of a 53-year-old male who initially presented to the ED in acute status epilepticus. His history was notable for seizures and multiple craniectomies and cranioplasties with subsequent placement of a ventriculoperitoneal shunt secondary to traumatic brain injury. Imaging in the ED suggested possible shunt failure. No previous imaging was available for comparison, and therefore a ventricular shunt tap was attempted. Initially, the tap could not be performed, as the shunt was not palpable secondary to the thickness of his scalp and location of the reservoir near his complex cranial reconstruction site. We report, for the first time, the utility of emergency ultrasound (EUS) to aid in such an encounter. Conclusion: EUS revealed the exact location of his shunt reservoir, and therefore enabled the shunt tap, which ultimately led to the discovery of the patient's proximal shunt failure in a setting that may have otherwise been missed. The patient underwent urgent shunt revision with a good outcome. PMID:24032076

Vega, Rafael A.; Buscher, Michael G.; Gonzalez, Michael S.; Tye, Gary W.

2013-01-01

30

[Systemic-pulmonary artery shunt using Golaski graft: trial for measurement of the shunt flow].  

PubMed

For the systemic-pulmonary artery shunt operation, the modified Blalock-Taussig shunt was the first choice for procedure in our institution. Since 1990, Golaski knitted Dacron graft (4 or 5 mm in diameter) was used for the prosthesis. Ex-vivo flow calibration of the electromagnetic flow meter (Nihon Koden, MFV-3100) to Golaski graft showed good correlation between the real flow and value measured by the electromagnetic flow meter. Shunt flow was measured in the consecutive clinical fifteen cases. The shunt flow per body surface area of the patient who required additional shunt operation was 721 ml/min/m2 and one patient in whom the congestive heart failure developed after the shunt operation, had the shunt flow of 3,022 ml/min/m2. The adequate shunt flow in these cases was ranged from 745 to 2,820 ml/min/m2 (mean +/- 1 SD, 1,490 +/- 587.8). Therefore we performed the systemic-pulmonary artery shunt operation using Golaski graft to get the shunt flow of 1,000 ml/min/m2 (approximately a third of cardiac index) for the guide of good results. PMID:7897896

Togo, T; Ito, T; Hata, M; Murata, S; Osaka, K; Komatsu, T; Tabayashi, K; Haneda, K; Mohri, T

1995-03-01

31

Calculation of coaxial shunts superheat temperature  

NASA Astrophysics Data System (ADS)

Coaxial shunt temperature field distribution has been obtained and analyzed using software package ANSYS. The main stages of 3D modeling of coaxial shunt temperature field in ANSYS are considered in the paper. It is determined that coaxial shunt temperature field distribution is nonuniform because of the material physical properties and free convection. The difference between theoretical temperature cylinder (60 °C) and experimentally observed temperature value (49 °C) of resistive pipe is caused by the fact that free convection and heat emission were not taken into account when calculating.

Bedareva, E. V.; Marinushkin, P. S.; Khudonogova, L. I.

2014-10-01

32

Acute Shunt Malfunction Caused by Percutaneous Endoscopic Gastrostomy without Shunt Infection  

PubMed Central

Percutaneous endoscopic gastrostomy tube placement is often performed in patients with a ventriculoperitoneal shunt and it has been accepted as a safe procedure. The authors report a case of a 50-year-old male who developed acute exacerbation of the hydrocephalus immediately after the percutaneous endoscopic gastrostomy tube placement without any signs of shunt infection, which has not been reported until now. After revision of the intraperitoneal shunt catheter, the sizes of the intracranial ventricles were normalized. PMID:25371790

Choi, Jingyu; Ki, Seung Seog

2014-01-01

33

Fasciocutaneous flap in esophageal stricture with ventriculoperitoneal shunt.  

PubMed

Abdominal surgery in a patient with ventriculoperitoneal shunt may increase the risk of shunt malfunction and infection. We present a successful case of resection and reconstruction of the cervical esophagus by rolled lateral thoracic artery fasciocutaneous flap in a patient with corrosive esophageal stricture and preexisting ventriculoperitoneal shunt. Follow-up esophagogastroscopy after 3 months revealed wide patent graft. Rolled fasciocutaneous flap may be a safe alternative treatment without risk of shunt-associated complications in a patient with ventriculoperitoneal shunt. PMID:24384193

Seong, Yong Won; Kang, Chang Hyun; Chang, Hak; Park, In Kyu; Kim, Young Tae

2014-01-01

34

S4LP and Local Realizability Melvin Fitting  

E-print Network

S4LP and Local Realizability Melvin Fitting Lehman College ­ CUNY 250 Bedford Park Boulevard West Bronx, NY 10548, USA melvin.fitting@lehman.cuny.edu Abstract. The logic S4LP combines the modal logic S4

Fitting, Melvin

35

Parallel solution of block angular LP problems using Kaul's algorithm  

E-print Network

Parallel solution of block angular LP problems using Kaul's algorithm Ilkay Boduro~glu1 , Julian, University of Edinburgh November 7th 2007 Parallel solution of block angular LP problems using Kaul problems parallel simplex · Kaul's algorithm #12;Overview · Introduction to block angular LP problems

Hall, Julian

36

Portocaval shunt for hepatocyte package  

PubMed Central

In developing therapeutic alternatives to liver transplantation, we have used the strategy of applying a small intestinal segment as a scaffold for hepatocyte transplantation and also as a portocaval shunt (PCS) system to address both liver dysfunction and portal hypertension. The aim of this study was to investigate the feasibility of such an intestinal segment in animal models. Hepatocytes isolated from luciferase-transgenic Lewis rats were transplanted into jejunal segments of wild-type Lewis rats with mucosa removal without PCS application. Luciferase-derived luminescence from transplanted hepatocytes was stably detected for 30 days. Then, we performed autologous hepatocyte transplantation into the submucosal layer of an isolated and vascularized small intestinal segment in pigs. Transplanted hepatocytes were isolated from the resected left-lateral lobe of the liver. On day 7, hepatocyte clusters and bile duct-like structures were observed histologically. To create an intestinal PCS system in pigs, an auto-graft of the segmental ileum and interposing vessel graft were anastomosed to the portal vein trunk and inferior vena cava. However, thrombi were observed in vessels of the intestinal PCSs. We measured the correlation between infusion pressure and flow volume in whole intestines ex vivo in both species and found that the high pressure corresponding to portal hypertension was still insufficient to maintain the patency of the intestinal grafts. In conclusion, we demonstrated the feasibility of the small intestine as a scaffold for hepatocyte transplantation in rat and pig models, but PCS using an intestinal graft failed to maintain patency in a pig model. PMID:23974217

Iwasaki, Junji; Hata, Toshiyuki; Uemoto, Shinji; Fujimoto, Yasuhiro; Kanazawa, Hiroyuki; Teratani, Takumi; Hishikawa, Shuji; Kobayashi, Eiji

2013-01-01

37

Venoatrial shunt-assisted cavopulmonary anastomosis.  

PubMed

The bidirectional Glenn shunt operation is conventionally performed under cardiopulmonary bypass. Between June 2007 and September 2009, 218 consecutive patients underwent off-pump bidirectional Glenn shunt institution for single ventricle with pulmonary stenosis complex. Their mean age was 4.72 ± 1.80 years (range, 4 months to 6 years) and median weight was 10.12 kg (range, 4.1-19 kg). A temporary shunt was created between the innominate vein and the right atrium, with a 3-way connector for de-airing. Fifty-five patients had bilateral cavae. The mean internal jugular venous pressure on clamping the superior vena cava was 24.69 ± 1.81 mm Hg. Continuous end-tidal CO? and O? saturation were monitored. Adequate oxygen saturation and blood pressure were maintained by optimizing inotropics, volume, and inspired oxygen. The mean duration of ventilation was 10.17 ± 8.96 h (range, 1-73 h). There were no gross neurological complications. Postoperative pleural effusion developed in 6 (2.75%) patients, and 4 (1.83%) had nodal rhythm. Four (1.83%) patients died in the immediate postoperative period due to low cardiac output syndrome. Venoatrial shunt-assisted bidirectional Glenn shunt surgery can be performed safely by optimizing intraoperative management strategies. It is economical and avoids the deleterious effects cardiopulmonary bypass. PMID:21149407

Kandakure, Pramod Reddy; Dharmapuram, Anil Kumar; Kale, Suresh Babu; Babu, Vivek; Ramadoss, Nagarajan; Rao, Ivatury Mrityunjaya; Murthy, Kona Samba

2010-12-01

38

Performance of self-excited single-phase induction generators with shunt, short-shunt and long-shunt excitation connections  

SciTech Connect

The influence of three capacitor excitation topologies (shunt, short-shunt and long-shunt) on the steady-state and dynamic performance of a single-phase, self-excited induction generator is explored in this paper. Attention is focused on the influence of the different capacitor connections on the generator overload and output power capabilities. The generator voltage with shunt excitation connection collapses when overloaded while with either the long or short-shunt excitation connection the generator is able to sustain the load at a lower operating voltage and larger load current.

Ojo, O. [Tennessee Technological Univ., Cookeville, TN (United States). Dept. of Electrical Engineering] [Tennessee Technological Univ., Cookeville, TN (United States). Dept. of Electrical Engineering

1996-09-01

39

Shunt malfunction after roller coaster ride  

Microsoft Academic Search

Introduction  We report a case of shunt malfunction after a child was subjected to G forces during a roller coaster ride.\\u000a \\u000a \\u000a \\u000a Discussion  The temporal sequence of events suggests proximal catheter obstruction with subsequent symptoms of raised intracranial pressure\\u000a immediately after experience with a G force ride. A shunt revision with catheter change led to resolution of symptoms, and\\u000a findings were consistent with

Christopher Gegg; Greg Olavarria; Jogi V. Pattisapu

2009-01-01

40

Thoracoscopic removal of retained thoracoamniotic shunt catheters in newborns.  

PubMed

Abstract Fetal hydrothorax is associated with significant mortality. However, the development of fetal thoracoamniotic shunting has reduced the mortality rate. Fetal thoracoamniotic shunting can be characterized by significant complications, such as intrathoracic dislodgement of the catheter. The ideal management of dislodged catheters postnatally is not known. We report two newborns with a prenatal diagnosis of fetal hydrothorax who underwent thoracoamniotic shunting complicated by intrathoracic dislodgement of the catheters requiring thoracoscopic removal of the shunts in the neonatal period. PMID:25264592

Macchini, Francesco; Gentilino, Valerio; Morandi, Anna; Leva, Ernesto

2014-11-01

41

Clinical experience with a new pressure-adjustable shunt valve  

Microsoft Academic Search

Summary The pressure-adjustable valve system Codman Medos allows valve pressure adjustment in 18 steps between 30 and 200 mm H2O. A series of 90 patients, 15 children and 75 adults, who were shunted with this new programmable valve, is reported. Indication for shunt insertion were various types of hydrocephalus in 79 cases, malfunction of a medium pressure membrane valve shunt

A. Reinprecht; T. Czech; W. Dietrich

1995-01-01

42

Portosystemic shunting for paediatric portal hypertension  

Microsoft Academic Search

The records of 22 patients who received portosystemic shunting for portal hypertension from 1985 to 1995 inclusive at the Royal Alexandra Hospital for Children (RAHC) were retrospectively reviewed. There were 11 girls and 11 boys. The average age at operation was 8 years, 3 months (range, 2 years, 3 months to 16 years, 7 months). The aetiology was idiopathic portal

A Shun; D. P Delaney; H. C. O Martin; G. M Henry; M Stephen

1997-01-01

43

In vitro bacterial adherence to ventriculoperitoneal shunts.  

PubMed

Bacterial adherence to medical devices has been recognized as an important initial step in the infectious process, but it has not been fully elucidated regarding ventriculoperitoneal (VP) shunts. The aim of the present study was to quantitatively determine the adherence in vitro of bacteria known to cause VP shunt infections and to identify factors affecting the process. Clinical isolates studied included Staphylococcus epidermidis, Staphylococcus aureus, Streptococcus pneumoniae, and Escherichia coli. Adherence was examined quantitatively per square centimeter, visualized by electron microscopy and related to slime production and hydrophobicity. Although all four strains adhered to VP shunts, there were marked differences, with S. epidermidis and S. aureus showing the highest adherence (67.0 x 10(3) and 15.2 x 10(3) bacteria/cm(2), respectively). Factors affecting adherence included incubation time and temperature, bacterial concentration, device material (lower for silicone than Teflon), slime production and hydrophobicity. These data might be helpful for devising novel strategies to reduce VP shunt infections. PMID:15292635

Livni, G; Yuhas, Y; Ashkenazi, S; Michowiz, S

2004-01-01

44

Prophylactic Methicillin for Shunt Operations: Effects on Incidence of Shunt Malfunction and Infection  

Microsoft Academic Search

In a double-blind study, 74 children were randomly treated with prophylactic methicillin at the time of ventriculo-peritoneal shunting. There were 7 infections in the placebo group and 2 in the methicillin-treated group. There was no statistically significant difference in infection or overall malfunction rate between the two groups. The risk of shunt malfunction in the 2nd to 6th month after

Stephen J. Haines; Floyd Taylor

1982-01-01

45

Lithium in LP 944-20  

E-print Network

We present a new estimate of the lithium abundance in the atmosphere of the brown dwarf LP 944-20. Our analysis is based on a self-consistent analysis of low, intermediate and high resolution optical and near-infrared spectra. We obtain log N(Li) = 3.25 +/-0.25 using fits of our synthetic spectra to the Li I resonance line doublet profiles observed with VLT/UVES and AAT/SPIRAL. This lithium abundance is over two orders of magnitude larger than previous estimates in the literature. In order to obtain good fits of the resonance lines of K I and Rb I and better fits to the TiO molecular absorption around the Li I resonance line, we invoke a semi-empirical model atmosphere with the dusty clouds located above the photosphere. The lithium abundance, however, is not changed by the effects of the dusty clouds. We discuss the implications of our estimate of the lithium abundance in LP 944-20 for the understanding of the properties of this benchmark brown dwarf.

Ya. V. Pavlenko; H. R. A. Jones; E. L. Martin; E. Guenther; M. A. Kenworthy; M. R. Zapatero Osorio

2007-07-04

46

Passively Shunted Piezoelectric Damping of Centrifugally-Loaded Plates  

NASA Technical Reports Server (NTRS)

Researchers at NASA Glenn Research Center have been investigating shunted piezoelectric circuits as potential damping treatments for turbomachinery rotor blades. This effort seeks to determine the effects of centrifugal loading on passively-shunted piezoelectric - damped plates. Passive shunt circuit parameters are optimized for the plate's third bending mode. Tests are performed both non-spinning and in the Dynamic Spin Facility to verify the analysis, and to determine the effectiveness of the damping under centrifugal loading. Results show that a resistive shunt circuit will reduce resonant vibration for this configuration. However, a tuned shunt circuit will be required to achieve the desired damping level. The analysis and testing address several issues with passive shunt circuit implementation in a rotating system, including piezoelectric material integrity under centrifugal loading, shunt circuit implementation, and tip mode damping.

Duffy, Kirsten P.; Provenza, Andrew J.; Trudell, Jeffrey J.; Min, James B.

2009-01-01

47

Effect of a prior portasystemic shunt on subsequent liver transplantation.  

PubMed Central

Fifteen patients who had a prior portasystemic shunt underwent orthotopic liver transplantation. Shunt types were portacaval in six patients, H-graft mesocaval in six, distal splenorenal in two, and proximal splenorenal in one. Mean blood loss and hospital stay were highest in the portacaval group. Retransplants (two patients) and deaths (two patients) also were limited to this group. In this report, technical considerations, advantages, and disadvantages of the various shunt types are described. Management of patients with late stages of portal hypertension must include estimation of the effects of a portasystemic shunt on subsequent liver transplantation. It is concluded that portacaval shunts should be avoided in patients who may be considered for transplantation. Distal splenorenal shunts are best performed in younger patients with intractable variceal bleeding who are not expected to require transplantation in the near future. A mesocaval H-graft is the shunt of choice in patients who are current liver transplant candidates. Images Fig. 3. PMID:2642690

Brems, J J; Hiatt, J R; Klein, A S; Millis, J M; Colonna, J O; Quinones-Baldrich, W J; Ramming, K P; Busuttil, R W

1989-01-01

48

Nitrogen heat pipe for cryocooler thermal shunt  

SciTech Connect

A nitrogen heat pipe was designed, built and tested for the purpose of providing a thermal shunt between the two stages of a Gifford-McMahan (GM) cryocooler during cooldown. The nitrogen heat pipe has an operating temperature range between 63 and 123 K. While the heat pipe is in the temperature range during the system cooldown, it acts as a thermal shunt between the first and second stage of the cryocooler. The heat pipe increases the heat transfer to the first stage of the cryocooler, thereby reducing the cooldown time of the system. When the heat pipe temperature drops below the triple point, the nitrogen working fluid freezes, effectively stopping the heat pipe operation. A small heat leak between cryocooler stages remains because of axial conduction along the heat pipe wall. As long as the heat pipe remains below 63 K, the heat pipe remains inactive. Heat pipe performance limits were measured and the optimum fluid charge was determined.

Prenger, F.C.; Hill, D.D.; Daney, D.E.; Daugherty, M.A. [Los Alamos National Lab., NM (United States); Green, G.F.; Roth, E.W. [Naval Surface Warfare Center, Annapolis, MD (United States)

1995-09-01

49

Quantum L_p and Orlicz spaces  

E-print Network

Let $\\A$ ($\\cM$) be a $C^*$-algebra (a von Neumann algebra respectively). By a quantum dynamical system we shall understand the pair $({\\A}, T)$ ($({\\cM}, T)$) where $T : {\\A} \\to {\\A}$ ($T : {\\cM} \\to {\\cM}$) is a linear, positive (normal respectively), and identity preserving map. In our lecture, we discuss how the techniques of quantum Orlicz spaces may be used to study quantum dynamical systems. To this end, we firstly give a brief exposition of the theory of quantum dynamical systems in quantum $L_p$ spaces. Secondly, we describe the Banach space approach to quantization of classical Orlicz spaces. We will discuss the necessity of the generalization of $L_p$-space techniques. Some emphasis will be put on the construction of non-commutative Orlicz spaces. The question of lifting dynamical systems defined on von Neumann algebra to a dynamical system defined in terms of quantum Orlicz space will be discussed.

L. E. Labuschagne; W. A. Majewski

2009-02-25

50

Commutators on Lp, 1 p < , W. B. Johnson  

E-print Network

Commutators on Lp, 1 p B. Johnson§ , G. Schechtman¶ May 22, 2012 Dedicated are those of the form I + S where 0 and S belongs to the largest ideal in L(Lp). The proof involves new is a commutator. The situation changes if instead of an arbitrary Banach algebra we consider the algebra L

Schechtman, Gideon

51

Parallel solution of block angular LP problems using Kaul's algorithm  

E-print Network

Parallel solution of block angular LP problems using Kaul's algorithm Ilkay Boduro~glu1 , Julian, University of Edinburgh November 7th 2007 Parallel solution of block angular LP problems using Kaul parallel simplex · Kaul's algorithm · Dense parallel scheme for Kaul's algorithm · Results · Sparse

Hall, Julian

52

Investigation on LP-residual representations for speaker identification  

Microsoft Academic Search

Feature extraction is an essential and important step for speaker recognition systems. In this paper, we propose to improve these systems by exploiting both conventional features such as mel frequency cepstral coding (MFCC), linear predictive cepstral coding (LPCC) and non-conventional ones. The method exploits information present in the linear predictive (LP) residual signal. The features extracted from the LP-residue are

Mohamed Chetouani; Marcos Faúndez-zanuy; Bruno Gas; Jean-luc Zarader

2009-01-01

53

The rabbit shunt model of subarachnoid haemorrhage.  

PubMed

Aneurysmal subarachnoid haemorrhage (SAH) is a disease with devastating complications that leads to stroke, permanent neurological deficits and death. Clinical and ex-perimental work has demonstrated the importance of the contribution of delayed cerebral vasospasm (DCVS) indepen-dent early events to mortality, morbidity and functional out-come after SAH. In order to elucidate processes involved in early brain injury (EBI), animal models that reflect acute events of aneurysmal bleeding, such as increase in intracranial pressure (ICP) and decrease in cerebral perfusion pressure, are needed. In the presented arterial shunt model, bleeding is initially driven by the pressure gradient between mean arterial blood pressure and ICP. SAH dynamics (flow rate, volume and duration) depend on physiological reactions and local anatomical intrathecal (cistern) conditions. During SAH, ICP reaches a plateau close to diastolic arterial blood pressure and the blood flow stops. Historical background, anaesthesia, perioperative care and monitoring, SAH induction, technical considerations and advantages and limitations of the rabbit blood shunt SAH model are discussed in detail. Awareness of technical details, physiological characteristics and appropriate monitoring methods guarantees successful implementation of the rabbit blood shunt model and allows the study of both EBI and DCVS after SAH. PMID:25326333

Marbacher, Serge; Nevzati, Edin; Croci, Davide; Erhardt, Salome; Muroi, Carl; Jakob, Stephan M; Fandino, Javier

2014-12-01

54

75 FR 70939 - Approval of Saybolt LP, as a Commercial Gauger  

Federal Register 2010, 2011, 2012, 2013

...Approval of Saybolt LP, as a Commercial Gauger AGENCY: U.S. Customs...approval of Saybolt LP, as a commercial gauger...Saybolt LP, 7308 North Main Street, Jacksonville, FL 32208...scientific--svcs/commercial--gaugers/. DATES:...

2010-11-19

55

Stevens Capital Management LP Stevens Capital Management L.P. ("SCM") is responsible for the overall portfolio management  

E-print Network

Stevens Capital Management LP Stevens Capital Management L.P. ("SCM") is responsible for the overall portfolio management and trading of a $3 billion multi-strategy hedge fund with a 22+ year track Philadelphia and employing more than 70 professionals, we seek talented and motivated individuals

Plotkin, Joshua B.

56

Respiratory Function in Infancy following Pleuro-Amniotic Shunting  

Microsoft Academic Search

Respiratory status was assessed at a median of 12 (range 3-60) months in 17 infants who had undergone pleuro-amniotic shunting to drain fetal pleural effusions. The shunts had been inserted at a median of 29 weeks (range 21-35) gestation; 12 fetuses were hydropic at the time of shunting. In all 17 cases effective chronic drainage of the pleural effusions was

P. J. Thompson; A. Greenough; K. H. Nicolaides

1993-01-01

57

Laparoscopy for a Ventriculoperitoneal Shunt Tube Dislocated into the Colon  

PubMed Central

Introduction: Implantation of a ventriculoperitoneal (VP) shunt is a standard procedure for hydrocephalus. Different complications can occur, one of them being migration of the distal end of the tube. Case Description: The abdominal end of a VP shunt tube had migrated into the descending colon. In a laparoscopic procedure, the shunt was retrieved, and the colonic perforation site was resected. The patient had a favorable outcome. Discussion: Laparoscopy can play a key role and is recommended not only to make an exact diagnosis, but also for definite, safe, and trauma-minimizing treatment of intraabdominal VP shunt dysfunction. PMID:24398218

Detzner, Michael; Heiss, Markus M.; Weber, Friedrich; Bulian, Dirk R.

2013-01-01

58

Mitra shunt (spleen preserving, side to side lieno-renal shunt) for portal hypertension with hypersplenism in early infancy  

PubMed Central

Extrahepatic portal vein obstruction (EHPVO) is the commonest cause of portal hypertension presenting with gastrointestinal bleeding and splenomegaly. Medical management of this condition may provide relief, but involves repeated hospital visits and endoscopic procedures. Surgery is an effective curative solution by lowering portal venous pressure with effective shunting of venous blood from splanchnic to systemic circulation. Shunt surgery for such a small baby has not been previously reported and splenectomy has its own problems. Similarly, banding or sclerotherapy in such babies is not without risk. Among the various shunt options, Mitra shunt (spleen preserving, side-to-side lienorenal shunt), developed and standardized in our own country, stands out as the most optimum surgical treatment for EHPVO in early infancy. We report a 4-month-old baby, youngest recipient of Mitra shunt reported in literature with successful outcome. PMID:24741213

Shinde, Sangram; Gopalan, Sarath; Kandpal, Deepak K.; Chowdhary, Sujit K.

2014-01-01

59

Effects of long-shunt and short-shunt connections on voltage variations of a self-excited induction generator  

Microsoft Academic Search

This paper presents a comparative study of steady-state performances of both long-shunt and short-shunt configurations of an isolated self-excited induction generator under various loading conditions. Both simulated and experimental results are clearly compared to examine the effects of both connections on load voltage variation of the studied induction generator. The analyzed results show that the long-shunt configuration can maintain lower

Li Wang; Jian-Yi Su

1997-01-01

60

DCaseLP: a Prototyping Environment for Multilingual Agent Systems  

E-print Network

- vantages of rapid prototyping in AOSE. Keywords. Multi-Agent System, Multilinguality, Agent-Oriented Software Engineering, Rapid Prototyping. 1 Introduction The correct and efficient engineeringDCaseLP: a Prototyping Environment for Multilingual Agent Systems Ivana Gungui, Maurizio Martelli

Mascardi, Viviana

61

Tightening LP Relaxations for MAP using Message Passing David Sontag  

E-print Network

Tightening LP Relaxations for MAP using Message Passing David Sontag CSAIL, MIT Cambridge, MA Talya Meltzer Hebrew University Jerusalem, Israel Amir Globerson CSAIL, MIT Cambridge, MA Tommi Jaakkola CSAIL

Goldwasser, Shafi

62

Management of Pregnant Women with Cerebrospinal Fluid Shunts  

Microsoft Academic Search

As more women with cerebrospinal fluid shunts reach child-bearing age, neurosurgeons, obstetricians and other health care providers will increasingly be called upon to care for them once they become pregnant. A review of the literature reveals that these patients may develop symptoms of shunt malfunction as uterine size increases. In most cases, symptoms can be managed conservatively during pregnancy and

Michael D. Cusimano; Filomena M. Meffe; Fred Gentili; Mathew Sermer

1992-01-01

63

Peritoneovenous shunting is an effective treatment for intractable ascites  

PubMed Central

Aim and methods: A retrospective review was carried out of children undergoing peritoneovenous shunting for intractable ascites. Results: 11 children, aged 3 months to 12 years (median 31 months) underwent peritoneovenous shunting over the past 17 years. The duration of ascites ranged from one month to 2.5 years (median two months). The primary pathology consisted of previous surgery in eight (three neuroblastoma, one renal carcinoma, one hepatoblastoma, one adrenal teratoma, one renal artery stenosis, and one diaphragmatic hernia), and cytomegalovirus hepatitis, lymphatic hypoplasia, and lymphohistiocytosis in one patient each. All patients had failed to respond to previous treatment including peritoneal drainage in six patients, diuretics in five, and parenteral nutrition in five. There were no intraoperative problems. Postoperative complications included pulmonary oedema in three patients, shunt occlusion in three, infection in two, and wound leakage in one. Ascites resolved after shunting in 10 patients. Five shunts were removed one to three years after insertion without recurrence of ascites. Three others are free of ascites with shunts in place for less than one year postoperatively. Three children died from their underlying disease: two after resolution of ascites (neuroblastoma) and one in whom the ascites failed to resolve (lymphohisticytosis). Conclusions: Peritoneovenous shunting is an effective treatment for symptomatic intractable ascites in children (10 of 11 successful cases in this series). Elective removal of the shunt after one year is recommended. PMID:15811892

Sooriakumaran, P; McAndrew, H; Kiely, E; Spitz, L; Pierro, A

2005-01-01

64

Ventriculosubgaleal Shunts for Posthemorrhagic Hydrocephalus in Premature Infants  

Microsoft Academic Search

Objective: The early management of posthemorrhagic hydrocephalus in premature infants is challenging and controversial. These infants need a temporary cerebrospinal fluid (CSF) diversion procedure until they gain adequate weight, and the blood and protein levels in CSF are reasonably low before permanent shunt can be placed. Various options are available with their associated advantages and disadvantages. Ventriculosubgaleal shunts have been

Brian K. Willis; Cherukuri Ravi Kumar; Esther L. Wylen; Anil Nanda

2005-01-01

65

Noise reduction using smart panel with shunt circuit  

Microsoft Academic Search

In this paper, piezoelectric smart panels featuring shunt damping are designed and tested for broadband noise reduction. Electrical admittance is introduced to represent electro-mechanical characteristics of piezoelectric smart structures and to predict the performance of piezoelectric shunt damping as a design index of the system. The location and size of piezoelectric patches on the host panel are optimized by taking

Li Jie Zhao; Heung Soo Kim; Jaehwan Kim

2006-01-01

66

94 5 Metrics on Normed Structures lp-metric  

E-print Network

system by the formula x, y = n i=1 xiyi. In a standard coordinate system #12;5 Metrics on Normed94 5 Metrics on Normed Structures · lp-metric The lp-metric dlp , 1 p , is a norm metric on Rn p . For p = , we obtain ||x|| = limp p n i=1 |xi|p = max1in |xi|. The metric space (Rn , dlp

Fitelson, Branden

67

LP models for bin packing and cutting stock problems  

Microsoft Academic Search

We review several linear programming (LP) formulations for the one-dimensional cutting stock and bin packing problems, namely, the models of Kantorovich, Gilmore-Gomory, onecut models, as in the Dyckho0-Stadtler ap-proach, position-indexed models, and a model derived from the vehicle routing literature. We analyse some relations between the corresponding LP relaxations, and their relative strengths, and refer how to derive branching schemes

José M. Valério De Carvalho

2002-01-01

68

Oxidized Phospholipids, Lp(a) Lipoprotein, and Coronary Artery Disease  

Microsoft Academic Search

background Lp(a) lipoprotein binds proinflammatory oxidized phospholipids. We investigated whether levels of oxidized low-density lipoprotein (LDL) measured with use of mono- clonal antibody E06 reflect the presence and extent of obstructive coronary artery dis- ease, defined as a stenosis of more than 50 percent of the luminal diameter. methods Levels of oxidized LDL and Lp(a) lipoprotein were measured in a

Sotirios Tsimikas; Emmanouil S. Brilakis; Elizabeth R. Miller; Joseph P. McConnell; Ryan J. Lennon; Kenneth S. Kornman; Joseph L. Witztum; Peter B. Berger

2010-01-01

69

[Results of revision and new operation in arteriovenous shunt complications].  

PubMed

Over a 10 years period 260 arterio-venous fistulas have been performed and followed up. The Brescia-Ciminoshunt was the most frequent type (n = 174). This type of fistula has been performed in about 85.2% of all cases as primary operation method. In secondary formations the saphena-interposition was used most frequently (49.4% of all cases). A shunt revision should be performed in cases of immediate thrombosis although a shorter life time of revisioned shunts compared with new formations is known. The new formation of a shunt should be considered if terminal thrombotic changes have been detected as well as in cases of shunt infection or shunt insufficiency. PMID:8677698

Schumann, M; Bartel, M; Wagner, W

1996-01-01

70

The effect of cephalothin prophylaxis on postoperative ventriculoperitoneal shunt infections.  

PubMed Central

Postoperative infection is an important complication after insertion of a ventriculoperitoneal (VP) shunt in children with hydrocephalus. A randomized double-blind placebo-controlled study was performed to determine the efficacy of cephalothin in preventing postoperative shunt infection. Sixty-three children who presented for elective VP shunt insertion between January 1982 and December 1985 and who did not have a history of shunt infections were randomly assigned to receive four doses of prophylactic cephalothin, 25 mg/kg (32 patients), or of a multivitamin placebo (31 patients). Postoperative infection developed in 6% of the treatment group, compared with 10% of the placebo group, a difference that was not statistically significant, although a clinical significance may have been masked by the small sample size. A large multicentre trial is needed to determine the efficacy of antibiotic prophylaxis in reducing the incidence of postoperative VP shunt infections. PMID:3552176

Rieder, M J; Frewen, T C; Del Maestro, R F; Coyle, A; Lovell, S

1987-01-01

71

Repeated cannulation of umbilical hernia with Ventriculoperiotoneal shunt catheter  

PubMed Central

Ventriculoperitoneal (VP) shunts are commonly used to manage hydrocephalus in both adult and paediatric populations. Whilst infection remains by far the most common complication leading to shunt revision other causes need to be considered. Our case report examines a 62-year-old female who presents for operative management of a Choroid Plexus Papilloma. Post-operatively she develops hydrocephalus and is managed with a VP shunt. Interestingly the distal end of the catheter cannulated an unknown umbilical hernia twice creating diagnostic dilemma. Issues around shunt insertion in the morbidly obese population and the basic science behind cerebrospinal fluid reabsorption are explored. Although this is a rare complication it should be considered in any post-operative shunt patient is slow to recover particularly if they are obese. PMID:24903026

Laidlaw, R.S.; Little, N.

2014-01-01

72

Comparison between classic-differential and automatic shunt functioning on the basis of infusion tests.  

PubMed

Infusion tests were performed in order to examine cerebrospinal compensatory ability in two groups of patients with impaired compensation, subjected to shunt implantation. The functioning of the classic differential shunts was compared to the automatically (Orbis-Sigma) functioning shunts. The reference group, with intact compensatory parameters is also presented. The influence of different types of shunts on the intracranial compensation ability was compared. Automatic shunts produce less decrease in the resorption resistance of CSF in the post-shunted examination than the classic differential shunts. Classic differential shunts disturb the mono-exponential character of the pressure-volume relationship in a higher degree than automatic shunts. Shunt functioning models were proposed as well as the method of detection of eventual recovery to the normal resorption reserve. This method can be applied only to patients with automatic shunts. PMID:2270783

Czosnyka, M; Maksymowicz, W; Batorski, L; Koszewski, W; Czosnyka, Z

1990-01-01

73

Lp-PLA2 levels in HIV-infected patients  

PubMed Central

Introduction HIV-infected patients show an increased risk of cardiovascular disease (CVD). In the general population, lipoprotein-associated phospholipase A2 (Lp-PLA2) appears to be an independent predictor of CVD. We aimed to study associations between Lp-PLA2 plasma levels and other risk factors for CVD in HIV patients. Materials and Methods A cross-sectional, comparative study of two series of cases (HIV patients, n=116 and age-matched non-HIV healthy controls, n=113) was conducted. Eighty-seven percent HIV patients on antiretroviral therapy (ART), 72.4% with HIV-1 viral load <50 cop/mL. Inflammatory biomarkers (CRP, Lp-PLA2) and internal carotid intima-media thickness (IMT) were measured and CVD risk (Framingham and SCORE algorithms) was calculated. Univariate and multivariable associations between these variables were performed. Results HIV patients presented higher Lp-PLA2 levels [276.81 ng/mL (209.71–356.58)] than uninfected healthy controls [220.80 ng/mL (172.70–256.90)], p?0.01. In univariate analysis of the global sample, only cigarette smoking was associated with higher Lp-PLA2 levels, p?0.001. In HIV group, female and smoker patients showed higher Lp-PLA2 levels, p?0.05. No significant association was found between Lp-PLA2 levels and another CVD risk factors, carotid IMT, Framingham and SCORE algorithms, ART, HIV-1 viral load neither and CD4+ T lymphocyte count. In multivariate analysis, cigarette smoking remained significantly associated with Lp-PLA2 levels [?=64.8 (95% CI 10.8–118.9) ng/mL, p=0.020]. Conclusions HIV-infected patients present higher Lp-PLA2 levels than healthy controls, and in this population, tobacco smoking is significantly associated with increased Lp-PLA2 levels. Smoking cessation should be a priority in CVD prevention in HIV-infected patients.

Diaz-Pollan, Beatriz; Estrada, Vicente; Fuentes-Ferrer, Manuel; Gomez-Garre, Dulcenombre; San Roman-Montero, Jesus

2014-01-01

74

75 FR 20870 - Montreux Equity Partners II SBIC, L.P.; Montreux Equity Partners III SBIC, L.P.; Notice Seeking...  

Federal Register 2010, 2011, 2012, 2013

...License No. 09/79-0452] Montreux Equity Partners II SBIC, L.P.; Montreux Equity Partners III SBIC, L.P.; Notice Seeking Exemption...Notice is hereby given that Montreux Equity Partners II SBIC, L.P. and Montreux Equity...

2010-04-21

75

LP DAAC and MEaSUREs - Optimizing Collection Inception  

NASA Astrophysics Data System (ADS)

The Land Processes Distributed Active Archive Center (LP DAAC) is a selected NASA Earth Observing System (EOS) Data and Information System (EOSDIS) DAAC supporting the Making Earth System Data Records for Use in Research Environments (MEaSUREs) Program to contribute in providing long-term, consistent, and mature data products. The LP DAAC has identified three essential components for the MEaSUREs collection inception. The first component includes a framework of LP DAAC's data lifecycle including overall inception of products, curation of products, and long-term archiving of products. The second component fuses data producer and data provider operations, interleaving key personnel into key processes throughout the project. The third component integrates and evolves stakeholder elements into a standard methodology, alongside affording an overall homogeneous data delivery system for MEaSUREs collections. As an active participant on the Metadata Evolution for NASA Data Systems (MENDS) Tiger Team, the LP DAAC is working to categorize all data model elements into the ISO 19115 international metadata standard. This poster depicts how each of these three components optimizes the LP DAAC MEaSUREs collection inception process.

Bennett, S.

2013-12-01

76

Ion beam sputter-etched ventricular catheter for hydrocephalus shunt  

NASA Technical Reports Server (NTRS)

A cerebrospinal fluid shunt in the form of a ventricular catheter for controlling the condition of hydrocephalus by relieving the excessive cerebrospinal fluid pressure is described. A method for fabrication of the catheter and shunting the cerebral fluid from the cerebral ventricles to other areas of the body is also considered. Shunt flow failure occurs if the ventricle collapse due to improper valve function causing overdrainage. The ventricular catheter comprises a multiplicity of inlet microtubules. Each microtubule has both a large openings at its inlet end and a multiplicity of microscopic openings along its lateral surfaces.

Banks, B. A. (inventor)

1983-01-01

77

Postnatal Chest Wall Deformities after Fetal Thoracoamniotic Shunting for Congenital Cystic Adenomatoid Malformation  

Microsoft Academic Search

Objectives: Large macrocystic congenital cystic adenomatoid malformations (CCAMs) can be treated with thoracoamniotic (TA) shunting to reduce CCAM volume. Two CCAM fetuses treated with TA shunt had postnatal radiographic rib deformities. Study Design: Retrospective review of prenatal TA shunting for large macrocystic CCAMs evaluated for the presence of rib deformities. Comparison groups not eligible for TA shunting included nonshunted CCAMs

Aziz M. Merchant; William Peranteau; R. Douglas Wilson; Mark P. Johnson; Michael W. Bebbington; Holly L. Hedrick; Alan W. Flake; N. Scott Adzick

2007-01-01

78

Circulating Lp(a):LDL Complexes Contain LDL Molecules Proportionate to Lp(a) Size and Bind to Galectin-1: A Possible Route for LDL Entry into Cells.  

PubMed

The molecular mechanism of vascular pathology mediated by circulating lipoprotein(a) [Lp(a)] remains unknown. We examined the role of two distinguishing features of Lp(a) viz non-covalent complex formation with a low density lipoprotein (LDL) and heavy glycosylation as determinants of binding of this lipoprotein and its LDL complex to cell-surface receptors. LDL isolated from the Lp(a):LDL complex, free LDL and oxidized LDL were equally efficient in forming a reconstituted complex with pure Lp(a). Complexed LDL in healthy individuals was equal in oxidation status to free LDL. The number of LDL molecules associated with each Lp(a) molecule (LDL index) in plasma samples increased steadily with Lp(a) size (correlation coefficient r = 0.834). Complex reconstituted from purified plasma Lp(a) and LDL maintained the same LDL index as plasma in accordance with Lp(a) size. Consequently, the percentage of complex-free Lp(a) in the plasma decreased sharply with Lp(a) size (r = -0.887). Although O-glycosylation measured in terms of lectin binding increased with Lp(a) size, the LDL index increased significantly faster than O-glycosylation among Lp(a) phenotypes of different plasma samples. Complexes with varying stoichiometry existed in the same plasma. Extra LDL complex molecules were not recognized by LDL receptors on human macrophages or rat cardiac fibroblasts indicating attachment to Lp(a) involved LDL receptor-binding sites. However, unlike free LDL complex LDL could attach through Lp(a) to immobilized form of galectin-1, a lectin ubiquitous on mammalian cells. Results suggest that phenotype-dependence of the physiological and pathological functions of Lp(a) may operate through differential LDL-carrier activity. PMID:25142165

Kalaivani, Vasantha; Appukuttan, Padinjaradath Sankunni

2014-11-01

79

Essentially nonlinear piezoelectric shunt circuits applied to mistuned bladed disks  

NASA Astrophysics Data System (ADS)

An essentially nonlinear piezoelectric shunt circuit is proposed for the practical realization of nonlinear energy sink, and then applied to a mistuned bladed disk for blade vibration reduction. First, the global dynamics of a single degree-of-freedom linear mechanical oscillator, coupled to an essentially nonlinear shunted piezoelectric attachment, is studied. Under certain conditions, the nonlinear targeted energy transfer, i.e. a fast, passive energy transfer from the mechanical oscillator to the nonlinear attachment is observed. A numerical method, referred to as the variable-coefficient harmonic balance method, is developed to calculate quasi-periodic responses arising in the electromechanical system under harmonic forcing. Characterized by the nonexistence of a resonance frequency, the essentially nonlinear shunt circuit is able to work robustly over a broad frequency band with a smaller inductance requirement compared with the linear resonant shunt circuit.

Zhou, B.; Thouverez, F.; Lenoir, D.

2014-04-01

80

An Examination of Applying Shunted Piezoelectrics to Reduce Aeroelastic Response  

NASA Technical Reports Server (NTRS)

Several analytical and experimental studies clearly demonstrate that piezoelectric materials (piezoelectrics) can be used as actuators to actively control vibratory response, including aeroelastic response. However, two important issues in using piezoelectrics as actuators for active control are: 1) the potentially large amount of power required to operate the actuators, and 2) the complexities involved with active control (added hardware, control law design, and implementation). Active or passive damping augmentation using shunted piezoelectrics may provide a viable alternative. This approach requires only simple electrical circuitry and very little or no electrical power. The current study examines the feasibility of using shunted piezoelectrics to reduce aeroelastic response using a typical-section representation of a wing and piezoelectrics shunted with a parallel resistor and inductor. The aeroelastic analysis shows that shunted piezoelectrics can effectively reduce aeroelastic response below flutter and may provide a simple, low-power method of subcritical aeroelastic control.

McGowan, Anna-Maria Rivas

1999-01-01

81

21 CFR 876.5955 - Peritoneo-venous shunt.  

Code of Federal Regulations, 2011 CFR

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5955 Peritoneo-venous shunt. (a) Identification. A...

2011-04-01

82

21 CFR 876.5955 - Peritoneo-venous shunt.  

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5955 Peritoneo-venous shunt. (a) Identification. A...

2014-04-01

83

21 CFR 876.5955 - Peritoneo-venous shunt.  

Code of Federal Regulations, 2012 CFR

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5955 Peritoneo-venous shunt. (a) Identification. A...

2012-04-01

84

21 CFR 876.5955 - Peritoneo-venous shunt.  

Code of Federal Regulations, 2013 CFR

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5955 Peritoneo-venous shunt. (a) Identification. A...

2013-04-01

85

21 CFR 876.5955 - Peritoneo-venous shunt.  

Code of Federal Regulations, 2010 CFR

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5955 Peritoneo-venous shunt. (a) Identification. A...

2010-04-01

86

Energy relaxation mechanisms in capacitively shunted flux qubits  

NASA Astrophysics Data System (ADS)

Energy losses in superconducting qubits remain a major object of study in the road towards scalable, highly coherent qubit devices. The current understanding of the loss mechanisms in these devices is far from being complete and it is sometimes difficult to experimentally separate the different contributions to decoherence. Here we compare a traditional three Josephson-junction flux qubit to the recently implemented capacitively shunted flux qubit [1], whose energy decay is thought to be limited by dielectric losses arising from native oxides in the shunting capacitor. Keeping all parameters identical except for the shunting capacitance, we obtain energy relaxation times that are comparable for both types of qubit. This suggests that the energy relaxation time is not limited by junction losses in capacitively shunted flux qubits. We discuss some other possible loss mechanisms present in these devices. [4pt] [1] M. Steffen et al. Phys. Rev. Lett. 105, 100502 (2010)

Corcoles, Antonio; Rozen, Jim; Rothwell, Mary Beth; Keefe, George; di Vincenzo, David; Ketchen, Mark; Chow, Jerry; Rigetti, Chad; Rohrs, Jack; Borstelmann, Mark; Steffen, Matthias

2011-03-01

87

9. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL LOCOMOTIVE NO. 6734 ON TURNTABLE, adjacent to Erecting Shop and Machine Shop - Juniata Shops, Turntable, South of Sixth Street at Third Avemue, Altoona, Blair County, PA

88

6. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL LOCOMOTIVE NO. 6734 ON TURNTABLE, adjacent to Erecting Shop and Machine Shop - Juniata Shops, Turntable, South of Sixth Street at Third Avemue, Altoona, Blair County, PA

89

7. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL LOCOMOTIVE NO. 6734 ON TURNTABLE, adjacent to Erecting Shop and Machine Shop - Juniata Shops, Turntable, South of Sixth Street at Third Avemue, Altoona, Blair County, PA

90

8. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL LOCOMOTIVE NO. 6734 ON TURNTABLE, adjacent to Erecting Shop and Machine Shop - Juniata Shops, Turntable, South of Sixth Street at Third Avemue, Altoona, Blair County, PA

91

5. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL LOCOMOTIVE NO. 6734 ON TURNTABLE, adjacent to Erecting Shop and Machine Shop - Juniata Shops, Turntable, South of Sixth Street at Third Avemue, Altoona, Blair County, PA

92

4. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL LOCOMOTIVE NO. 6734 ON TURNTABLE, adjacent to Erecting Shop and Machine Shop - Juniata Shops, Turntable, South of Sixth Street at Third Avemue, Altoona, Blair County, PA

93

The Intermediate Age Brown Dwarf LP 944-20  

E-print Network

Observations are presented which show that LiI 6708A is detected with equivalent width of 0.53+-0.05A in the proper-motion object LP 944-20 (which is also known as BRI 0337-3535). This Li detection implies that LP 944-20 is a brown dwarf with mass between 0.057 and 0.063Mo and age between 475 and 650Myr, making it the first brown dwarf to have its mass and age precisely determined.

C. G. Tinney

1998-01-17

94

Transjugular Intrahepatic Portosystemic Shunts in Children with Biliary Atresia  

Microsoft Academic Search

Purpose: We retrospectively evaluated the technical and long-term clinical results of transjugularintrahepatic portosystemic shunts (TIPS) in children with portal hypertension and biliary atresia (BA). Methods: Nine children with BA and recurrent bleeding from esophagogastric and\\/or intestinal varices were treated by TIPS at the age of 34-156 months and followed-up in two centers. Different types of stents were used. Results: Shunt

Peter E. Huppert; Pierre Goffette; Wolfgang Astfalk; Emil M. Sokal; Hans-Juergen Brambs; Ullrich Schott; Stephan H. Duda; Paul Schweizer; Claus D. Claussen

2002-01-01

95

Quantifying lung shunting during planning for radio-embolization  

NASA Astrophysics Data System (ADS)

A method is proposed for accurate quantification of lung uptake during shunt studies for liver cancer patients undergoing radio-embolization. The current standard for analysis of [99mTc]-MAA shunt studies is subjective and highly variable. The technique proposed in this work involves a small additional peripheral intravenous injection of macroaggregated albumin (MAA) and two additional static acquisitions (before and after injection) to quantify the absolute activity in the lungs as a result of arterio-venous shunting. Such quantification also allows for estimates of absorbed dose to lung tissue at the time of treatment based on MIRD formalism. The method was used on six radio-embolization patients attending the department for lung shunt analysis. Quantitative values for each were compared to a previously validated technique using fully quantitative SPECT/CT imaging, treated as the gold standard. The average difference between absolute activity shunted to the lungs calculated by the proposed technique compared to the previously validated technique was found to be 2%, with a range of (1-8)%. The proposed method is simple and fast, allowing for accurate quantification of lung shunting and estimates of absorbed dose to lung tissue at treatment, and may one day be used in a one-stop procedure for planning and therapy in a single interventional procedure.

Willowson, Kathy; Bailey, Dale L.; Baldock, Clive

2011-07-01

96

Aberrant Gene Expression in Dogs with Portosystemic Shunts  

PubMed Central

Congenital portosystemic shunts are developmental anomalies of the splanchnic vascular system that cause portal blood to bypass the liver. Large-breed dogs are predisposed for intrahepatic portosystemic shunts (IHPSS) and small-breed dogs for extrahepatic portosystemic shunts (EHPSS). While the phenotype resulting from portal bypass of the liver of the two types of shunt is identical, the genotype and molecular pathways involved are probably different. The aim of this study was to gain insight into the pathways involved in the different types of portosystemic shunting. Microarray analysis of mRNA expression in liver tissue from dogs with EHPSS and IHPSS revealed that the expression of 26 genes was altered in either IHPSS or EHPSS samples compared with that in liver samples from control dogs. Quantitative real-time PCR of these genes in 14 IHPSS, 17 EHPSS, and 8 control liver samples revealed a significant differential expression of ACBP, CCBL1, GPC3, HAMP, PALLD, VCAM1, and WEE1. Immunohistochemistry and Western blotting confirmed an increased expression of VCAM1 in IHPSS but its absence in EHPSS, an increased WEE1 expression in IHPSS but not in EHPSS, and a decreased expression of CCBL1 in both shunt types. Regarding their physiologic functions, these findings may indicate a causative role for VCAM1 in IHPSS and WEE1 for IHPSS. CCBL1 could be an interesting candidate to study not yet elucidated aspects in the pathophysiology of hepatic encephalopathy. PMID:23451256

Grinwis, Guy C. M.; Kummeling, Anne; van Gils, Ingrid H. M.; Koerkamp, Marian J. A. Groot.; van Leenen, Dik; Holstege, Frank C. P.; Penning, Louis C.; Rothuizen, Jan; Leegwater, Peter A. J.; Spee, Bart

2013-01-01

97

Otogenic Pneumocephalus Associated with a Ventriculoperitoneal Shunt  

PubMed Central

Otogenic pneumocephalus is a condition of intracranial air originating from the middle ear or mastoid air cells. This communication between the intracranial cavity and the pneumatic cavities is usually associated with trauma after cranial fractures or iatrogenic trauma. We present a rare case of otogenic pneumocephalus arising in the left posterior fossa from wellpneumatized mastoid air cells. The patient complained of roaring tinnitus that developed 29 months after ventriculoperitoneal shunt insertion due to brain tumor surgery. High resolution computed tomography scan of the temporal bones revealed a large pneumocephalus below the left tentorium, and a bony dehiscent route was clearly identified in a sagittal view. A left mastoidectomy with preservation of the posterior wall of the external auditory canal was performed, and the expected bony dehiscent site was identified in the posterior fossa dura plate, just posterior to the posterior semicircular canal, below the Donaldson's line. This communication was sealed with a temporalis muscle plug from the deep temporalis muscle fascia and bone dust. Pneumocephalus may be caused by negative intracranial pressure in a patient with very well-pneumatized mastoid bone, and it can be a possible cause of 'wind-like' sound in the ear. PMID:20072696

Kim, Young Hoon; Lee, Won Il; Park, Mi-Na; Choi, Hyun Seung; Kim, Na Hyun

2009-01-01

98

A shunt-excited inductive power link.  

PubMed

An alternative derivation of the separation-insensitive property of series-excited self-oscillating inductive power transfer circuits is presented. This analysis is based on network theory and does not include the explicit determination of frequency as a step in the derivation. The separation-insensitivity principle is extended to shunt-excited links which exhibit a theoretical voltage transfer function of unity while the coupling factor exceeds the reciprocal of the secondary quality factor. This requires the inclusion of a series resistor in the primary resonator's capacitive arm. Series RC elements are replaced by parallel forms in both the primary and secondary; this provides a more convenient output impedance level without the need for another transformer. A demonstration circuit is described and tested. It is found that separation-insensitivity occurs while the coupling factor exceeds the reciprocal of the loaded secondary quality factor. Somewhat inferior response is obtained from a simpler circuit having no added resistances in the primary. PMID:2769731

Sylvan, K; Jordan, J R; Whittington, H W

1989-01-01

99

Urethrocutaneous fistula post-Al-Ghorab shunt  

PubMed Central

Priapism is a rare event that may be induced by clinical conditions and medications. Ischemic priapism (IP) is a compartment syndrome of the penis, and it constitutes a medical emergency that may cause significant morbidity on the erectile function in particular. We report a case of a 30-year-old male in his fourth episode of priapism. The aspiration and washing of the corpora cavernosa with saline solution were performed, followed by washing with adrenaline solution without resolution of the condition. Treatment was followed by the performance of the Al-Ghorab shunt procedure with dorsal incision of the glans. During follow-up, an area of necrosis distal to the incision was detected, and after the catheter removal on postoperative day 14, the patient developed a glandular dorsal urethrocutaneous fistula and meatal stenosis. The meatal stenosis was corrected by Johanson urethroplasty with a neo-meatus at the coronal sulcus, along with resection and debridement of the fistula tract and a three-layer closure.

Paladino, Joao Roberto; Wroclawski, Marcelo; Den Julio, Alexandre; Teixeira, Gabriel Kushyama; Glina, Sidney; Lima Pompeo, Antonio Carlos

2014-01-01

100

Fire Service Training. LP and Compressed Gas Emergencies.  

ERIC Educational Resources Information Center

Part of a series of instructional outlines intended for use in a training program for firemen with no previous formal training, this curriculum guide discusses safety precautions for liquefied petroleum (LP) and compressed gas emergencies. During its twelve hours of instruction it covers (1) terminology; (2) the chemical composition of the gases;…

North Carolina State Dept. of Community Colleges, Raleigh.

101

PuLP: A Linear Programming Toolkit for Python  

E-print Network

Sep 5, 2011 ... guage. PuLP is a high-level modelling library that leverages the power of the ... any system that has a Python interpreter, as it has no dependencies on any other software ... uses Python's control structures and arithmetic operators (see section 3). In con- ..... and any separation between them is arbitrary.

2011-09-05

102

US EPA Testing of LP & MP UV Disinfection Technologies  

EPA Science Inventory

Presentation will discuss the ongoing USEPA research on UV disinfection addressing the following objectives: Conservatively predict log inactivation and RED of adenovirus with surrogates; Conduct many (LP=61) UV reactor conditions challenged with Ad2, B. pumilus, and MS2 & conduc...

103

ON THE CONFIGURATION-LP FOR SCHEDULING ON UNRELATED MACHINES  

E-print Network

ON THE CONFIGURATION-LP FOR SCHEDULING ON UNRELATED MACHINES JOSÃ? VERSCHAE AND ANDREAS WIESE Abstract. One of the most important open problems in machine scheduling is the problem of scheduling a set of jobs on unrelated machines to minimize the makespan. The best known approximation algorithm

Nabben, Reinhard

104

LP-based Approximation Algorithms for Capacitated Facility Location  

E-print Network

problems [9]. We consider the capacitated facility location problem with hard capacities. We are given and the client assignment costs. The recent work on facility location problems has come in two varieties: LP on a decomposition of the input into instances of the single-demand capacitated facility location problem

Swamy, Chaitanya

105

Lp-PLA2 Inhibition--The Atherosclerosis Panacea?  

PubMed Central

Based on the complex pathophysiology of atherosclerosis, a large number of biomarkers that relate to lipids, inflammation, immunity, thrombosis and hemostasis, have been investigated experimentally, in epidemiologic studies and in clinical trials. Interest focuses on their potential role to aid in risk stratification, as possible surrogate markers of atherosclerosis, and potential targets for therapy. More recently, one lipid associated biomarker, lipoprotein-associated phospholipase A2 (Lp-PLA2), has gained considerable interest. In addition to a plausible pathophysiological role by generating pro-inflammatory and pro-atherogenic compounds from oxidized LDL in the vessel wall, there is a large, fairly consistent epidemiological database indicating that increased levels of Lp-PLA2 mass or activity are associated with increased risk for cardiovascular outcomes; such data further suggest that it might improve risk stratification. In addition, clinical studies indicate that increased Lp-PLA2 levels are associated with endothelial dysfunction. Moreover, it may also serve as an interesting therapeutic target, since a specific inhibitor of the enzyme is available with promising animal data and initial positive data in humans. Recent experimental data from a hyperlipidemic diabetic pig model strongly suggest that increased Lp-PLA2 in the vessel wall is associated with a more vulnerable plaque phenotype which can be modulated by inhibiting Lp-PLA2 activity. A biomarker study in more than 1,000 patients with CHD over three months has demonstrated a positive effect on various inflammatory molecules. In addition, an imaging study using IVUS based modalities (greyscale, virtual histology, and palpography) together with a panel of biomarkers (IBIS-2) has been done in more than 300 patients with CHD treated over 12 months and results indicate that the progression of the necrotic core of the plaque can be retarded. Inhibition of the pro-atherogenic and pro-inflammatory effects of Lp-PLA2 may therefore contribute to decrease the residual risk in high risk patients already on polypharmacotherapy. This hypothesis is now being tested in two large phase 3 clinical trials. Thus, Lp-PLA2 indeed may represent a biomarker and a promising target for intervention.

Karakas, Mahir; Koenig, Wolfgang

2010-01-01

106

75 FR 79065 - Emergence Capital Partners SBIC, L.P. License No. 09/79-0454; Notice Seeking Exemption Under...  

Federal Register 2010, 2011, 2012, 2013

...Regulations because Emergence Capital Partners, L.P. and Emergence Capital...Associates of Emergence Capital Partners SBIC, L.P., own more than...Associate of Emergence Capital Partners SBIC, L.P. and this transaction...BILLING CODE...

2010-12-17

107

77 FR 30589 - SteelRiver Infrastructure Partners LP, SteelRiver Infrastructure Associates LLC, SteelRiver...  

Federal Register 2010, 2011, 2012, 2013

...SteelRiver Infrastructure Fund North America LP, and Patriot Funding LLC--Control...SteelRiver Infrastructure Fund North America LP (SRIFNA LP), and Patriot Funding...Texas Railway, Inc.; (7) Piedmont & Northern Railway, Inc.; (8) Columbia &...

2012-05-23

108

PLC-based LP11 mode rotator for mode-division multiplexing transmission.  

PubMed

A PLC-based LP11 mode rotator is proposed. The proposed mode rotator is composed of a waveguide with a trench that provides asymmetry of the waveguide. Numerical simulations show that converting LP11a (LP11b) mode to LP11b (LP11a) mode can be achieved with high conversion efficiency (more than 90%) and little polarization dependence over a wide wavelength range from 1450 nm to 1650 nm. In addition, we fabricate the proposed LP11 mode rotator using silica-based PLC. It is confirmed that the fabricated mode rotator can convert LP11a mode to LP11b mode over a wide wavelength range. PMID:25320998

Saitoh, Kunimasa; Uematsu, Takui; Hanzawa, Nobutomo; Ishizaka, Yuhei; Masumoto, Kohei; Sakamoto, Taiji; Matsui, Takashi; Tsujikawa, Kyozo; Yamamoto, Fumihiko

2014-08-11

109

78 FR 39717 - Iroquois Gas Transmission System, LP; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...Commission [ Docket No. CP13-502-000] Iroquois Gas Transmission System, LP; Notice of Application Take notice that on June 13, 2013, Iroquois Gas Transmission System, LP, (Iroquois), filed in Docket No....

2013-07-02

110

75 FR 29333 - Iroquois Gas Transmission System, L.P.; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...Commission [Docket Nos. CP10-433-000] Iroquois Gas Transmission System, L.P.; Notice...2010. Take notice that on May 17, 2010, Iroquois Gas Transmission System, L.P. (Iroquois), One Corporate Drive, Shelton,...

2010-05-25

111

Exponential sums with coe cients 0 or 1 and concentrated Lp  

E-print Network

of whether the Lp concentration phenomenon fails to occur when p = 1: titre francais: Sommes d'exponentielles a coe cients 0 ou 1 et concentration de normes Lp resume francais: Une somme d'exponentielles de la

Ash, J. Marshall

112

76 FR 57087 - Stone Harbor Investment Partners LP, et al.; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...Release No. 29784; File No. 812-13931] Stone Harbor Investment Partners LP, et al.; Notice...certain financial instruments. Applicants: Stone Harbor Investment Partners LP (``Stone Harbor'') and Stone Harbor Investment...

2011-09-15

113

78 FR 12048 - Gulf Shore Energy Partners, LP; Notice of Abbreviated Application for Limited Amendment to...  

Federal Register 2010, 2011, 2012, 2013

...Commission [Docket No. CP13-78-000] Gulf Shore Energy Partners, LP; Notice of Abbreviated Application...Convenience and Necessity On February 11, 2013, Gulf Shore Energy Partners, LP (``Gulf Shore''), filed an abbreviated application for...

2013-02-21

114

77 FR 70432 - Magic Valley Pipeline, L.P.; Notice of Filing  

Federal Register 2010, 2011, 2012, 2013

...Regulatory Commission [Docket No. PR13-9-000] Magic Valley Pipeline, L.P.; Notice of Filing Take notice that on November 15, 2012, Magic Valley Pipeline, L.P. (Magic Valley) filed to revise its Statement of...

2012-11-26

115

76 FR 61036 - Airworthiness Directives; Gulfstream Aerospace LP Model Galaxy and Gulfstream 200 Airplanes  

Federal Register 2010, 2011, 2012, 2013

...2120-AA64 Airworthiness Directives; Gulfstream Aerospace LP Model Galaxy and Gulfstream 200 Airplanes AGENCY: Federal Aviation Administration...Applicability (c) This AD applies to Gulfstream Aerospace LP Model Galaxy and Gulfstream 200 airplanes, certificated in any...

2011-10-03

116

76 FR 38062 - Airworthiness Directives; Gulfstream Aerospace LP Model Galaxy and Gulfstream 200 Airplanes  

Federal Register 2010, 2011, 2012, 2013

...2120-AA64 Airworthiness Directives; Gulfstream Aerospace LP Model Galaxy and Gulfstream 200 Airplanes AGENCY: Federal Aviation Administration...Applicability (c) This AD applies to Gulfstream Aerospace LP Model Galaxy and Gulfstream 200 airplanes, certificated in any...

2011-06-29

117

Endoscopic Third Ventriculostomy in Patients with Shunt Malfunction  

PubMed Central

Objective This paper presents data from a retrospective study of endoscopic third ventriculostomy (ETV) in patients with shunt malfunction and proposes a simple and reasonable post-operative protocol that can detect ETV failure. Methods We enrolled 19 consecutive hydrocephalus patients (11 male and 8 female) who were treated with ETV between April 2001 and July 2010 after failure of previously placed shunts. We evaluated for correlations between the success rate of ETV and the following parameters : age at the time of surgery, etiology of hydrocephalus, number of shunt revisions, interval between the initial diagnosis of hydrocephalus or the last shunt placement and ETV, and the indwelling time of external ventricular drainage. Results At the time of ETV after shunt failure, 14 of the 19 patients were in the pediatric age group and 5 were adults, with ages ranging from 14 months to 42 years (median age, 12 years). The patients had initially been diagnosed with hydrocephalus between the ages of 1 month 24 days and 32 years (median age, 6 years 3 months). The etiology of hydrocephalus was neoplasm in 7 patients; infection in 5; malformation, such as aqueductal stenosis or megacisterna magna in 3; trauma in 1; and unknown in 3. The overall success rate during the median follow-up duration of 1.4 years (9 days to 8.7 years) after secondary ETV was 68.4%. None of the possible contributing factors for successful ETV, including age (p=0.97) and the etiology of hydrocephalus (p=0.79), were statistically correlated with outcomes in our series. Conclusion The use of ETV in patients with shunt malfunction resulted in shunt independence in 68.4% of cases. Age, etiology of hydrocephalus, and other contributing factors were not statistically correlated with ETV success. External ventricular drainage management during the immediate post-ETV period is a good means of detecting ETV failure. PMID:21607179

Lee, Seung Hoon; Kong, Doo Sik; Seol, Ho Joon

2011-01-01

118

78 FR 69078 - Houston Pipe Line Company LP; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...CP14-13-000] Houston Pipe Line Company LP; Notice of...October 28, 2013, Houston Pipe Line Company LP (HPL), 1300...Commission and open to public inspection. This filing is available for...Deputy General Counsel, Houston Pipe Line Company LP, 1300...

2013-11-18

119

29 CFR 1926.153 - Liquefied petroleum gas (LP-Gas).  

Code of Federal Regulations, 2012 CFR

... 2012-07-01 false Liquefied petroleum gas (LP-Gas). 1926.153 Section...Prevention § 1926.153 Liquefied petroleum gas (LP-Gas). (a) Approval of...for transportation or storing liquefied petroleum gases. (b) Welding on LP-Gas...

2012-07-01

120

29 CFR 1926.153 - Liquefied petroleum gas (LP-Gas).  

Code of Federal Regulations, 2013 CFR

... 2013-07-01 false Liquefied petroleum gas (LP-Gas). 1926.153 Section...Prevention § 1926.153 Liquefied petroleum gas (LP-Gas). (a) Approval of...for transportation or storing liquefied petroleum gases. (b) Welding on LP-Gas...

2013-07-01

121

Material-induced shunts in multicrystalline silicon solar cells  

SciTech Connect

By applying lock-in thermography imaging, light-beam-induced current imaging, electron-beam-induced current imaging at different stages of sample preparation, and infrared light microscopy in transmission mode, the physical nature of the dominant material-induced shunts in multicrystalline solar cells made from p-type silicon material has been investigated. It turns out that these shunts are due to silicon carbide (SiC) filaments, which grow preferentially in grain boundaries and cross the whole cell. These filaments are highly n-type doped, like the emitter layer on the surface of the cells. They are electrically connected both with the emitter and with the back contact, thereby producing internal shunts in the solar cell.

Breitenstein, O., E-mail: breiten@mpi-halle.mpg.de; Bauer, J. [Max Planck Institute of Microstructure Physics (Germany); Rakotoniaina, J. P. [Q-Cells AG (Germany)

2007-04-15

122

Treatment of Hydrocephalus Associated with Neurosarcoidosis by Multiple Shunt Placement  

PubMed Central

A 31-year-old man was admitted to our hospital due to hydrocephalus with neurosarcoidosis. Ventriculo-peritoneal shunting was performed in the right lateral ventricle with intravenous methylprednisolone. Subsequently, after 4 months, additional ventriculo-peritoneal shunting in the left lateral ventricle was performed due to the enlarged left lateral ventricle and slit-like right lateral ventricle. After 6 months, he was re-admitted due to upward gaze palsy, and magnetic resonance image showed an isolated fourth ventricle with both the inlet and outlet of fourth ventricle obstructed by recurrent neurosarcoidosis. Owing to the difficulty of using an endoscope, we performed neuronavigator-guided ventriculo-peritoneal shunting via the left lateral transcerebellar approach for the treatment of the isolated fourth ventricle with intravenous methyl prednisolone. The patient was discharged with improved neurological status. PMID:23115677

Kim, Sung Hoon; Sung, Soon Ki; Son, Dong Wuk

2012-01-01

123

Treatment of hydrocephalus associated with neurosarcoidosis by multiple shunt placement.  

PubMed

A 31-year-old man was admitted to our hospital due to hydrocephalus with neurosarcoidosis. Ventriculo-peritoneal shunting was performed in the right lateral ventricle with intravenous methylprednisolone. Subsequently, after 4 months, additional ventriculo-peritoneal shunting in the left lateral ventricle was performed due to the enlarged left lateral ventricle and slit-like right lateral ventricle. After 6 months, he was re-admitted due to upward gaze palsy, and magnetic resonance image showed an isolated fourth ventricle with both the inlet and outlet of fourth ventricle obstructed by recurrent neurosarcoidosis. Owing to the difficulty of using an endoscope, we performed neuronavigator-guided ventriculo-peritoneal shunting via the left lateral transcerebellar approach for the treatment of the isolated fourth ventricle with intravenous methyl prednisolone. The patient was discharged with improved neurological status. PMID:23115677

Kim, Sung Hoon; Lee, Sang Weon; Sung, Soon Ki; Son, Dong Wuk

2012-09-01

124

Fiber-optic bend sensor using LP21 mode operation.  

PubMed

A novel fiber-optic bending sensor based upon the propagation of LP21 mode is demonstrated. The sensor, comprised of an S-bend fiber on an elastic film, measures LP21 mode specklegram rotation, which increments linearly with bending angle by the stress-optic effect. The sensor is capable of experimentally achieving a sensitivity as high as 4.13 rad/m(-1). The theoretical analysis of the sensor, which is a combination of fiber coupled-mode theory and elastic-optic theory, validates the accuracy of the sensor. The sensor is also shown to be temperature-immune, and can detect both bending direction and bending angle with a large dynamic range. Furthermore, the sensor implementation incorporates inexpensive single-mode fiber at 650 nm for few-mode operation, enabling low-loss transmission and compatibility with existing interfaces. PMID:23187468

Fan, Yuqiang; Wu, George; Wei, Wanting; Yuan, Yufeng; Lin, Feng; Wu, X

2012-11-19

125

In Vitro and In Vivo Comparison of Two Suprachoroidal Shunts  

PubMed Central

Purpose. To compare fibrosis, aqueous humor dynamics, and intraocular pressure (IOP) of two suprachoroidal shunts as part of a new class of glaucoma drainage devices. Methods. Following proliferation analysis in vitro, 20 rabbits were implanted with either a gold shunt (GS, GMSplus+, SOLX) or a polypropylene shunt (PS, Aquashunt, OPKO). Ten eyes received mitomycin C (MMC) and triamcinolone. Peak and trough IOP were monitored with a pneumatonometer and tono-pen for 15 weeks. Aqueous humor dynamics were evaluated fluorophotometrically and tonographically. Fibrosis was quantified. Results. In vitro proliferation was similar. In vivo, both shunts were devoid of foreign body reaction but exhibited fibrosis, and GS showed vascularization. There was no significant difference in aqueous or uveoscleral flow. Preoperative morning IOP was 23.7 ± 2 mm Hg, and evening IOP was 26.5 ± 2 mm Hg (P = 0.000). Morning IOP was decreased through 15 weeks and evening IOP through 8 weeks in all groups. The morning IOP decrease was most profound at 15 weeks in PS (41%) compared to GS (18%). Antifibrotics initially enhanced but eventually diminished shunt performance. At 15 weeks, thickness of scleral fibrosis was greater in GS (246 ± 47 ?m) and PS (188 ± 47 ?m, P = 0.285) compared with GS+MMC (109 ± 26 ?m, P = 0.023 to GS) and PS+MMC (48 ± 30 ?m, P = 0.028 to PS). Conclusions. In a rabbit model, suprachoroidal polypropylene and gold shunts allow access to a new drainage pathway with different IOP profiles that can be modified with antifibrotics. PMID:23847318

Oatts, Julius T.; Zhang, Ze; Tseng, Harry; Shields, M. Bruce; Sinard, John H.; Loewen, Nils A.

2013-01-01

126

Portacaval Shunt Established in Six Dogs Using Magnetic Compression Technique  

PubMed Central

Background and Aims Installing the transjugular intrahepatic portosystemic shunt for portal hypertension is relatively safe, but complications are still high. To explore a new method of portacaval shunt, the magnetic compression technique was introduced into the shunting procedure. Methods A portal-inferior vena cava shunt was performed on 6 male mongrel dogs by two hemocompatible Nd-Fe-B permanent magnets, parent and daughter. The parent magnet was applied to the inferior vena cava guided by a catheter through the femoral vein. The daughter magnet was moved to the anastomosis position on the portal vein with a balloon catheter through the splenic vein. After the daughter magnet reached the target position, the two magnets acted to compress the vessel wall and hold it in place. Five to 7 days later, under X-ray guidance, the magnets were detached from the vessel wall with a rosch-uchida transjugular liver access set. One month later, histological analysis and portal venography were performed. Results 5-7 days after the first surgery, a mild intimal hyperplasia in the portal vein and the inferior vena cava, and continuity of the vascular adventitia from the portal vein to the inferior vena cava as observed. During the second surgery, the contrast media could be observed flowing from the portal vein into the inferior vena cava. Portal venography revealed that the portosystemic shunt was still present one month after the second surgery. Conclusions Magnamosis via a device of novel design was successfully used to establish a portacaval shunt in dogs. PMID:24098809

Yan, Xiaopeng; Fan, Chao; Ma, Jia; Li, Jianhui; Dong, Dinghui; Wang, Haohua; Ma, Feng; Zheng, Xinglong; Lv, Yi

2013-01-01

127

Shunt-related headaches: the slit ventricle syndromes  

Microsoft Academic Search

Purpose  The purpose of this work is to review the pathophysiology and treatment of severe headache disorders in patients having a\\u000a shunt for hydrocephalus.\\u000a \\u000a \\u000a \\u000a Materials and methods  The literature on the management of the slit ventricle syndrome is reviewed as well as an assessment of personal experiences\\u000a over a 30-year period in the management of severe headache disorders in shunted patients.\\u000a \\u000a \\u000a \\u000a Results  If

Harold L. Rekate

2008-01-01

128

Acquired lacunar skull deformity following ventriculoperitoneal shunt placement.  

PubMed

A female infant developed hydrocephalus as a result of intraventricular hemorrhage related to premature birth. Radiography showed no sign of lacunar skull deformity (LSD). Lateral and fourth ventricle ventriculoperitoneal shunts were placed. The fourth ventricle shunt required replacement at age 3 years. Radiography and computed tomography showed LSD. Follow-up radiography at age 8 years showed the LSD was becoming unclear. LSD generally appears before birth, and disappears shortly after birth. LSD is most commonly associated with spina bifida cystica or encephalocele. This case of acquired LSD indicates that abnormal disorganized collection of collagen fibers of the skull plates may be triggered by iatrogenic intracranial hypotension even after infancy. PMID:18219193

Nakahara, Kuniaki; Shimizu, Satoru; Kan, Shinichi; Oka, Hidehiro; Fujii, Kiyotaka

2008-01-01

129

Smell of danger: an analysis of LP-gas odorization  

SciTech Connect

LP-gas derives warning properties from the odorants ethyl mercaptan or thiophane. Laboratory tests have implied that the average person has the ability to smell the odors before leaking LP-gas reaches one-fifth its lower limit of flammability. Generally, however, laboratory tests ignore or discard persons with a poor sense of smell, especially the elderly and persons with certain types of hyposmia. Some persons who apparently can smell the warning agents when directed may otherwise fail to notice or identify them. Elderly men seem particularly vulnerable to instances of incidental anosmia and olfactory agnosia. Psychophysical testing of the warning agents has been rather unsophisticated. There exists neither a standard protocol for testing nor adequate specification of the perceptual properties that might make one warning agent better than another. Without such developments, improvement in warning agents will fail to occur. Possible improvements include increases in concentration, the use of blends to insure more uniform delivery of agent and, to decrease the perceptual vulnerability of relatively insensitive people, use of agents with favorable psychophysical (stimulus-response) functions and use of agents with favorable adaptation characteristics. Even without a change in existing products, it seems advisable to learn more about the vulnerability of LP-gas users and to employ educational means to reduce risks.

Cain, W.S.; Turk, A.

1985-03-01

130

Threatened ventriculostomy shunt exposure: augmenting native soft tissue coverage with acellular dermal matrix graft.  

PubMed

Avoiding threatened ventriculostomy shunt exposure in the pediatric population remains a difficult problem for the neurosurgeon and reconstructive surgeon. In this case series, the authors present a novel method of augmenting scalp soft tissue with acellular dermal matrix (ADM) in patients with a history of ventricular shunt revisions. Soft tissue augmentation with ADM successfully prevented shunt exposure in 3 patients with a history of shunt revision due to impending exposure following conventional techniques. PMID:22880889

Ridder, Thomas; Zhang, Shuhao; Tye, Gary; Rhodes, Jennifer L

2012-10-01

131

New and improved ways to treat hydrocephalus: Pursuit of a smart shunt  

PubMed Central

The most common treatment for hydrocephalus is placement of a cerebrospinal fluid shunt to supplement or replace lost drainage capacity. Shunts are life-saving devices but are notorious for high failure rates, difficulty of diagnosing failure, and limited control options. Shunt designs have changed little since their introduction in 1950s, and the few changes introduced have had little to no impact on these long-standing problems. For decades, the community has envisioned a “smart shunt” that could provide advanced control, diagnostics, and communication based on implanted sensors, feedback control, and telemetry. The most emphasized contribution of smart shunts is the potential for advanced control algorithms, such as weaning from shunt dependency and personalized control. With sensor-based control comes the opportunity to provide data to the physician on patient condition and shunt function, perhaps even by a smart phone. An often ignored but highly valuable contribution would be designs that correct the high failure rates of existing shunts. Despite the long history and increasing development activity in the past decade, patients are yet to see a commercialized smart shunt. Most smart shunt development focuses on concepts or on isolated technical features, but successful smart shunt designs will be a balance between technical feasibility, economic viability, and acceptable regulatory risk. Here, we present the status of this effort and a framework for understanding the challenges and opportunities that will guide introduction of smart shunts into patient care. PMID:23653889

Lutz, Barry R.; Venkataraman, Pranav; Browd, Samuel R.

2013-01-01

132

Robust Passive Piezoelectric Shunt Dampener S. Behrens, A. J. Fleming and S. O. R. Moheimani  

E-print Network

Robust Passive Piezoelectric Shunt Dampener S. Behrens, A. J. Fleming and S. O. R. Moheimani School introduces a new multiple mode passive piezoelectric shunt damping technique. The robust pas- sive piezoelectric shunt controller is capable of damping multiple structural modes and maybe less susceptible

Fleming, Andrew J.

133

Comparison of Simultaneous Versus Delayed Ventriculoperitoneal Shunt Insertion in Children Undergoing Myelomeningocele Repair  

Microsoft Academic Search

The timing of cerebrospinal fluid shunt insertion for those neonates with hydrocephalus in association with myelomeningocele remains controversial. To examine whether there was a difference in either the complication rate or mean hospital stay for neonates undergoing myelomeningocele repair and shunting under the same anesthetic (simultaneous group) versus those in whom shunt insertion was delayed for several days after myelomeningocele

Peter D. Miller; Ian F. Pollack; Dachling Pang; A. Leland Albright

1996-01-01

134

Congenital multiple intrahepatic portosystemic shunt: an autopsy case  

PubMed Central

Multiple intrahepatic portosystemic shunt (IPSS) without portal hypertension, now thought to be congenital in origin, is very rare. The presence of IPSS, unlike other congenital diseases, may not be recognized for several decades due to the time it takes to develop hepatic encephalopathy. In this article, we report an autopsy case of an 80-year-old Japanese woman with a one-month history of hyperammonemic encephalopathy. Radiological examination of the liver revealed some abnormal connections between the branches of the portal veins and the hepatic veins, but the cause of the aberrant blood flow was not found. The cause of death was extensive cerebral infarction due to thromboembolism. At postmortem examination, multiple anomalous blood vessels were identified histologically in both lobes of the non-cirrhotic liver. In comparison with the few similar cases existing in the literature, this case should be diagnosed as congenital IPSS. To our knowledge, this is the first detailed histological study of IPSS, as several autopsy case reports exist but their histological descriptions are poor. Unlike past reports, the shunt vessels were accompanied by clear elastic lamellae that were microscopically observed. In addition to shunt vessels, septal fibrosis, disorder of hepatic acinar structure, and sinusoidal dilatation and capillarization were observed in the liver. We suggest that these histological modifications observed in the circumference of the shunt vessels acted as secondary regenerative/hyperplastic changes based on blood-flow imbalance caused by the IPSS. PMID:24427367

Takahashi, Seishiro; Yoshida, Eriko; Sakanishi, Yasushi; Tohyama, Norihiro; Ayhan, Ayse; Ogawa, Hiroshi

2014-01-01

135

Trabeculectomy versus ExPRESS shunt surgery in residency training.  

PubMed

The core curriculum for an ophthalmology residency training program should include surgical procedures relevant to a comprehensive ophthalmologist. Considerations include outcomes (success and complications), technical skill required, applicability to a wide range of disease, and cost. Using these metrics, trabeculectomy should be favored over ExPRESS shunt surgery. PMID:22633461

Buys, Yvonne M

2012-01-01

136

Ionic Conductances of Extracellular Shunt Pathway in Rabbit Ileum  

PubMed Central

The unidirectional influxes of Na, K, and Cl into isolated strips of rabbit ileum are comprised of movements across the mucosal membrane of the epithelial cells and ionic diffusion into an extracellular shunt pathway. A large fraction of the Na influx across the mucosal membrane alone is inhibited by Li, suggesting the participation of a carrier mechanism in the influx process. The partial ionic shunt conductances of Na, K, and Cl account for at least 82% of the total tissue conductance. The calculated shunt permeabilities (P) are (in centimeters per hour) PK = 0.040, PNa = 0.035, and PCl = 0.019, so that PK:PNa:PCl = 1.14:1.00:0.55. Diffusion potentials across the tissue resulting from isotonic replacement of NaCl in the mucosal solution with mannitol or KCl are described by the Goldman constant-field equation together with the above permeabilities of the shunt pathway. These observations are not consistent with permeation through a fixed-charge pore but can be explained by a model featuring constant ionic partition into a neutral-polar pore that traverses the tight junction. Such a pore may be lined with either fixed dipoles or fixed dipolar ions oriented such that electronegative groups influence the permselective properties of the diffusion pathway. The essential feature of both models is that electroneutrality is maintained by means of fixed membrane components and does not depend upon the presence of mobile counterions. PMID:5058963

Frizzell, Raymond A.; Schultz, Stanley G.

1972-01-01

137

Multimodal Passive Vibration Suppression with Piezoelectric Materials and Resonant Shunts  

Microsoft Academic Search

Passive piezoelectric damping devices are studied. These devices, consisting of a piezoelectric element and a resonant shunt, are analogous to mechanical damped vibration ab sorbers. In the past, a single piezoelectric device has been used to suppress a single structural mode. In this paper, the theory is expanded so that a single piezoelectric element can be used to suppress multiple

Joseph J. Hollkamp

1994-01-01

138

Intrauterine Shunt for Obstructive Hydrocephalus – Still Not Ready  

Microsoft Academic Search

Objective: To determine the safety and efficacy of ventriculoamniotic shunt placement through a hysterotomy in the second trimester of pregnancy as treatment for isolated obstructive hydrocephalus. Methods: Between 1999 and 2003, four pregnancies with isolated fetal obstructive hydrocephalus in the second trimester were treated at Vanderbilt University Medical Center. Preoperatively, all fetuses underwent serial ultrasonographic examinations and an ultrafast magnetic

Joseph P. Bruner; George Davis; Noel Tulipan

2006-01-01

139

Respiratory function in infancy following pleuro-amniotic shunting.  

PubMed

Respiratory status was assessed at a median of 12 (range 3-60) months in 17 infants who had undergone pleuro-amniotic shunting to drain fetal pleural effusions. The shunts had been inserted at a median of 29 weeks (range 21-35) gestation; 12 fetuses were hydropic at the time of shunting. In all 17 cases effective chronic drainage of the pleural effusions was achieved. Respiratory status at follow-up was assessed by documentation of respiratory symptoms and measurement of functional residual capacity (FRC) by a helium gas dilution technique. Six infants suffered from recurrent respiratory symptoms, this incidence (37%) did not differ significantly from that found in a control group. The mean FRC of the study population was 28 ml/kg (range 19-34 ml/kg), only 2 infants' FRCs were below the reference range. These results suggest that pleuro-amniotic shunting may, be effective drainage of pleural effusion and hence prevention of chronic antenatal intrathoracic compression, avoid impairment of antenatal lung growth. PMID:8338629

Thompson, P J; Greenough, A; Nicolaides, K H

1993-01-01

140

Ascites-induced LeVeen shunt coagulopathy.  

PubMed Central

Ten of 11 patients undergoing peritoneovenous (LeVeen) shunt placement for intractable ascites had disseminated intravascular coagulation (DIC) following the shunt procedure. Intraoperative ascitic fluid specimens revealed fibrin split products (FSP) in high titer (1:100-1:1600) in all patients. Endotoxin was found in 6 of 11 ascitic fluid samples but in no plasma samples. Activated clotting factors, clot inhibitors, excess protein, and fibrinolytic activity were not found in ascitic fluid. Clotting factor levels were much lower than in plasma. Bleeding occurred after operation in two patients; this appeared to be related to the severity of liver dysfunction as demonstrated by elevations of bilirubin, serum glutamic oxalocetic transaminase (SGOT), serum glutamic pyruvic transaminase (SGPT), and preoperative DIC. It is concluded that the LeVeen shunt coagulopathy is DIC, and may be related to exposure of the systemic circulation to FSP-rich ascitic fluid that may activate the coagulation mechanism. Bleeding complications do not appear to be related to the severity of the post shunt coagulopathy, but rather to the severity of liver dysfunction and presence of preoperative DIC (probably caused by the liver disease). PMID:6859998

Ragni, M V; Lewis, J H; Spero, J A

1983-01-01

141

Embolization of nonvariceal portosystemic collaterals in transjugular intrahepatic portosystemic shunts  

SciTech Connect

Percutaneous embolization of large portosystemic collaterals was performed in three patients following placement of a transjugular intrahepatic portosystemic shunt in order to improve hepatopetal portal flow. Improved hepatic portal perfusion was achieved in these cases, thereby theoretically reducing the risk of chronic hepatic encephalopathy.

Bilbao, Jose Ignacio; Arias, Mercedes; Longo, Jesus Maria; Alejandre, Pedro Luis [Universidad de Navarra, Department of Radiology, Clinica Universitaria, Facultad de Medicine (Spain); Betes, Maria Teresa [Universidad de Navarra, Department of Gastroenterology, Clinica Universitaria, Facultad de Medicina (Spain); Elizalde, Arlette Maria [Universidad de Navarra, Department of Radiology, Clinica Universitaria, Facultad de Medicine (Spain)

1997-03-15

142

A Gender Recognition System using Shunting Inhibitory Convolutional Neural Networks  

Microsoft Academic Search

In this paper, we employ shunting inhibitory convolutional neural networks to develop an automatic gender recognition system. The system comprises two modules: a face detector and a gender classifier. The human faces are first detected and localized in the input image. Each detected face is then passed to the gender classifier to determine whether it is a male or female.

Fok Hing Chi Tivive; Abdesselam Bouzerdoum

2006-01-01

143

Effect of peritoneo-venous shunt on portal pressure.  

PubMed Central

The cause of variceal bleed after a peritoneo-venous shunt is not known. Portal haemodynamic consequences of a peritoneo-venous shunt are poorly understood. The most critical period after a peritoneo-venous shunt is the early postoperative period when rapid mobilisation of peritoneal fluid occurs. Serial changes in the portal pressure during the early postoperative period have not been recorded. In the present study preoperative wedge hepatic vein (WHV), right atrial (RA) and pulmonary capillary wedged (PCW) pressures, cardiac index (CI), and plasma volume (PV) were measured in five alcoholic cirrhotic patients with tense ascites for up to 20 hours postoperatively. The longterm effect was assessed by repeating the intrahepatic and/or wedged hepatic vein pressures in three of the surviving patients after 10 to 20 months. A significant increase in the circulatory dynamics and portal pressure was seen within two hours after shunt placement. Wedged hepatic vein pressure increased from 27.6 (8.2) mmHg to 37.2 (9.2) mmHg (p less than 0.01), RA pressure increased from 6.8 (1.5) mmHg to 14.0 (4.3) mmHg (p less than 0.05), PCW increased from 7.2 (3.5) mmHg to 19.3 (5.7) mmHg (p less than 0.01), CI increased from 3.4 (0.27) lit/m2/min to 4.3 (0.85) lit/m2/min (p less than 0.05). This was accompanied by a 34% increase in the plasma volume from 1838.5 (142.1) to 2471.4 (210) ml/m2. These derangements were maintained up to 20 hours postoperatively. After 10 to 20 months, repeat measurements revealed a return to preoperative measurements. It is concluded that there is an acute increase portal pressure after a peritoneo-venous shunt attributed to increased circulation plasma volume, resulting from rapid mobilisation of ascitic fluid after the shunt. A sudden increase in portal pressure might be an important provoking factor for variceal bleeding after peritoneo-venus shunt. PMID:2920931

Samanta, A K; Leevy, C M

1989-01-01

144

A new method for the measurement of intrahepatic shunts  

SciTech Connect

After transhepatic portal pressure determination, 96 patients were assessed for the presence of intrahepatic shunts by injection of microspheres (25 +/- 5 micron diameter) into the portal vein using RISA-131I as an indicator of dilution. Multiple portal vein injections in each patient allowed blood sampling from the hepatic vein (site 1) and from two inferior vena cava sampling sites (site 2, at the junction of the hepatic vein orifice with the inferior vena cava, and site 3, 2 to 3 cm closer to or within the right atrium). Intrahepatic shunting was calculated from each site: hepatic vein in 57 patients and inferior vena cava, site 2 in 43 patients and site 3 in 77 patients. At least one valid IHS calculation was available in 92 of the patients. Intrahepatic shunting calculated from sequential portal vein injections with sampling from the hepatic vein was highly correlated (r . 0.98, p less than 0.0001, slope . 1.0), with a mean difference of 1.9% +/- 1.9%. There was no significant difference by t test comparison of the mean IHS calculated from sites 1, 2, and 3. Occasional marked discrepancies were noted between IHS calculated from site 1 or site 2 compared with site 3, and the site 3 calculation was always greater. A shunt index in all patients included shunts calculated from the hepatic vein in 57 patients plus shunt calculation from the inferior vena cava in the remaining patients (site 2 in 26 patients and site 3 in nine). The 82 patients with portal hypertension or chronic liver disease had a higher portal pressure, 13.8 +/- 4.6 mm Hg, and a significantly greater shunt index, 13.7% +/- 24.5% compared with controls. The frequency distribution of IHS in patients with chronic liver disease demonstrated less than 2% IHS in 49% of patients and less than 5% IHS in 63%. The validity of our methods and the implications of the infrequent demonstration of a large IHS are discussed.

Hoefs, J.C.; Reynolds, T.B.; Pare, P.; Sakimura, I.

1984-03-01

145

Embolization of splenorenal shunt associated to portal vein thrombosis and hepatic encephalopathy  

PubMed Central

Hepatic encephalopathy (HE) is a cognitive disturbance characterized by neuropsychiatric alterations. It occurs in acute and chronic hepatic disease and also in patients with portosystemic shunts. The presence of these portosystemic shunts allows the passage of nitrogenous substances from the intestines through systemic veins without liver depuration. Therefore, the embolization of these shunts has been performed to control HE manifestations, but the presence of portal vein thrombosis is considered a contraindication. In this presentation we show a cirrhotic patient with severe HE and portal vein thrombosis who was submitted to embolization of a large portosystemic shunt. Case report: a 57 years-old cirrhotic patient who had been hospitalized many times for persistent HE and hepatic coma, even without precipitant factors. She had a wide portosystemic shunt and also portal vein thrombosis. The abdominal angiography confirmed the splenorenal shunt and showed other shunts. The larger shunt was embolized through placement of microcoils, and the patient had no recurrence of overt HE. There was a little increase of esophageal and gastric varices, but no endoscopic treatment was needed. Since portosystemic shunts are frequent causes of recurrent HE in cirrhotic patients, portal vein thrombosis should be considered a relative contraindication to perform a shunt embolization. However, in particular cases with many shunts and severe HE, we found that one of these shunts can be safely embolized and this procedure can be sufficient to obtain a good HE recovery. In conclusion, we reported a case of persistent HE due to a wide portosystemic shunt associated with portal vein thrombosis. As the patient had other shunts, she was successfully treated by embolization of the larger shunt.

Franzoni, Leticia de Campos; de Carvalho, Fabio Cardoso; Garzon, Rafael Gomes de Almeida; Yamashiro, Fabio da Silva; Augusti, Lais; Santos, Livia Alves Amaral; Dorna, Mariana de Souza; Baima, Julio Pinheiro; Lima, Talles Bazeia; Caramori, Carlos Antonio; Silva, Giovanni Faria; Romeiro, Fernando Gomes

2014-01-01

146

A case of antiphospholipid antibody syndrome diagnosed after thrombosis of an arteriovenous shunt.  

PubMed

A 32-year-old male dialysis patient with lupus nephritis was admitted because of shunt obstruction. The arteriovenous fistula was reconstructed, but obstruction recurred twice within several hours after surgery. A high blood level of anticardiolipin beta2-glycoprotein I antibody suggested that shunt obstruction was caused by a thrombotic tendency related to the antiphospholipid antibody syndrome. Accordingly, for the third shunt procedure, antiplatelet therapy (which had been commenced for systemic lupus erythematosus) was combined with dalteparin sodium from before surgery and warfarin was added postoperatively. This regimen prevented shunt obstruction. In conclusion, hemodialysis patients who suffer repeated shunt obstruction should be examined for antiphospholipid antibody syndrome. PMID:10533910

Naito, T; Yorioka, N; Kyuden, Y; Yamashita, K; Ueda, C; Usui, K; Shigemoto, K; Harada, S; Yamakido, M

1999-08-01

147

Ateriovenous subclavia-shunt for head and neck reconstruction.  

PubMed

Reconstruction of the facial hard- and soft tissues is of special concern for the rehabilitation of patients especially after ablative tumor surgery has been performed. Impaired soft and hard tissue conditions as a sequelae of extensive surgical resection and/or radiotherapy may impede common reconstruction methods. Even free flaps may not be used without interposition of a vein graft as recipient vessels are not available as a consequence of radical neck dissection. We describe the reconstruction of the facial hard- and soft tissues with a free parasacpular flap in a patient who had received ablative tumor surgery and radical cervical lymphadenectomy as a treatment regimen for squamous cell carcinoma (SCC). To replace the missing cervical blood vessels an arteriovenous subclavia-shunt using a saphena magna graft was created. Microvascular free flap transfer was performed as a 2-stage procedure two weeks after the shunt operation. The microvascular reconstructive technique is described in detail. PMID:19025619

Depprich, Rita A; Naujoks, Christian D; Meyer, Ulrich; Kübler, Norbert R; Handschel, Jörg G

2008-01-01

148

Post-Shunt Resource Consumption Favors Small-Diameter Prosthetic H-Graft Portacaval Shunt Over TIPS for Patients With Poor Hepatic Reserve  

PubMed Central

Objective To define the role of surgical shunting for patients with poor hepatic reserve (Child’s class C) in the era of TIPS. Summary Background Data Most physicians prefer TIPS to surgical shunting for patients with poor hepatic reserve because of anticipated poor long-term survival. Methods Sixty-two patients of Child’s class C with bleeding varices not amenable to endoscopic sclerotherapy or banding were prospectively randomized to undergo TIPS or 8-mm prosthetic H-graft portacaval shunt (HGPCS) from 1993 to 1999. Resource consumption and survival after shunting were determined. Results Twenty-nine patients underwent TIPS and 33 underwent HGPCS. After HGPCS, survival at 3 years was favorable but not statistically superior. TIPS was more often associated with shunt stenoses/occlusions, recurrent hemorrhage, shunt revisions, and shunt failure. Long-term follow-up documented that after HGPCS, patients required fewer hospital and ICU days and fewer units of RBCs transfused. After HGPCS, cost of care was less, as was the median cost of care per day of survival. Conclusions For Child’s class C patients undergoing HGPCS or TIPS, long-term survival is similar, though favoring HGPCS. Similarly, measures of resource consumption and cost of care following hospital discharge favor HGPCS. HGPCS should be preferentially applied for acceptable patients without access to convenient capable post-shunt care or without definitive plans for imminent transplantation. PMID:12796578

Rosemurgy, Alexander S.; Zervos, Emmanuel E.; Bloomston, Mark; Durkin, Alan J.; Clark, Whalen C.; Goff, Stephanie

2003-01-01

149

What is the risk of infecting a cerebrospinal fluid-diverting shunt with percutaneous tapping?  

PubMed

Object Most CSF-diverting shunt systems have an access port that can be percutaneously tapped. Tapping the shunt can yield valuable information as to its function and whether an infection is present. The fear of causing a shunt infection by tapping may limit the physician's willingness to do so. The authors of this study investigate the risk of infecting a shunt secondary to percutaneous tapping. Methods Following institutional review board approval, CSF specimens obtained from tapping an indwelling CSF-diverting shunt during the 2011 and 2012 calendar years were identified and matched with clinical information. A culture-positive CSF sample was defined as an infection. If results were equivocal, such as a broth-only-positive culture, a repeat CSF specimen was examined. The CSF was obtained by tapping the shunt access port with a 25-gauge butterfly needle after prepping the unshaven skin with chlorhexidine. Results During the study period, 266 children underwent 542 shunt taps. With 541 taps, no clinical evidence of a subsequent shunt infection was found. One child's CSF went from sterile to infected 11 days later; however, this patient had redness along the shunt tract at the time of the initial sterile tap. Conclusions The risk of infection from tapping a shunt is remote if the procedure is done correctly. PMID:25105511

Spiegelman, Lindsey; Asija, Richa; Da Silva, Stephanie L; Krieger, Mark D; McComb, J Gordon

2014-10-01

150

Relation between Shunt, Aeration, and Perfusion in Experimental Acute Lung Injury  

PubMed Central

Rationale: In a pulmonary process characterized by spatially heterogeneous loss of aeration, the impairment of gas exchange is expected to depend on the regional distribution of perfusion relative to that of aeration. Objectives: To investigate how regional aeration, shunt, and perfusion are interrelated at different levels of end-expiratory pressure and how their interplay relates to global shunt fraction in acute lung injury. Methods: Regional shunt and perfusion were assessed by imaging with positron emission tomography the pulmonary kinetics of [13N]nitrogen infused in saline solution in five sheep after lung lavage. The lung field was divided in six horizontal regions. Measurements and Main Results: Each animal showed an inverse relation between regional shunt (Fs) and gas (Fg) fractions: Fs = ?m · Fg + Fs0. This relation was similar among animals (m = 1.25 ± 0.14, Fs0 = 0.75 ± 0.15) and invariant with end-expiratory pressure, despite lack of correlation between global shunt and gas fractions and large interanimal variability in global shunt fraction. When this relation was used to estimate global shunt fraction as a perfusion-weighted average of the estimates of regional shunt fraction derived from regional gas fraction, 72% of the interanimal variability in global shunt fraction could be explained. Conclusions: Despite large interanimal variability in global shunt fraction, there was a consistent inverse relation between regional shunt and gas fractions, independent of end-expiratory pressure. Most of the interanimal variability in global shunt fraction could be explained by the combined effect of this relation and the distribution of perfusion on regional shunt, rather than by differences in global aeration. PMID:17932380

Musch, Guido; Bellani, Giacomo; Vidal Melo, Marcos F.; Harris, R. Scott; Winkler, Tilo; Schroeder, Tobias; Venegas, Jose G.

2008-01-01

151

Slit ventricles as a cause of isolated ventricles after shunting  

Microsoft Academic Search

In a follow-up study of 164 hydrocephalic children without tumors treated with ventriculoperitoneal shunts, 46 (28.0%) developed slit ventricles, 5 (3.0%) developed isolated fourth ventricles, and 4 (2.4%) developed isolated unilateral hydrocephalus. All of the patients with isolated unilateral hydrocephalus and 3 with isolated fourth ventricles had associated slit ventricles, 2 of whom had enlarged ventricles as double-compartment hydrocephalus. Reopening

Shizuo Oi; Satoshi Matsumoto

1985-01-01

152

Robust perfect compensation of load harmonics in shunt active filters  

Microsoft Academic Search

In this paper an advanced control strategy is proposed for shunt active filter (SAF) used in three-phases three-wires current harmonic compensation. The SAF considered are based on AC\\/DC three-phase boost converter topology. The robust solution presented by the authors previously is used as a starting point to develop the stabilizing controller of the DC-MA voltage dynamics. SAF resistive power losses

Lorenzo Marconi; Fabio Ronchi; Andrea Tilli

2004-01-01

153

Transjugular Intrahepatic Portosystemic Shunts in Children with Biliary Atresia  

Microsoft Academic Search

Purpose: We retrospectively evaluated the technical and long-term clinical results of transjugular intrahepatic portosystemic shunts (TIPS) in children with portal hypertension and biliary atresia (BA). Methods: Nine children with BA and recurrent bleeding from esophagogastric and\\/or intestinal varices were treated by TIPS at the age of 34-156 months and followed-up in two centers. Different types of stents were used. Results:

Peter E. Huppert; Pierre Goffette; Wolfgang Astfalk; Emil M. Sokal; Hans-Jürgen Brambs; Ullrich Schott; Stephan H. Duda; Paul Schweizer; Claus D. Claussen

2002-01-01

154

Small-diameter mesocaval shunts: A 10-year evaluation  

Microsoft Academic Search

The use of small-diameter portosystemic shunts for the treatment of bleeding esophageal varices caused by portal hypertension\\u000a has emerged as an outgrowth of the development of polytetrafluoroethylene vascular grafts, which allow the use of a narrow\\u000a lumen. We report our experience with this type of graft over a 10-year period. Thirty-three patients with good liver function\\u000a (Child-Pugh class A) were

Miguel Angel Mercado; Héctor Orozco; Erika Guillén-Navarro; Erik Acosta; Luz María López-Martinez; Carlos Hinojosa; Jorge Hernández; Manuel Tielve

2000-01-01

155

Transjugular Intrahepatic Portosystemic Shunt before and after Liver Transplantation.  

PubMed

The transjugular intrahepatic portosystemic shunt (TIPS) has long been referred to as a procedure performed as "a bridge to transplantation" since, like many other portosystemic shunts, it decompresses the portal circulation and stabilizes patients but does not definitively treat portal hypertension. One of the major advantages of TIPS over surgically placed portosystemic shunts in the transplant era is that the TIPS is intrahepatic and is removed in situ with the native liver, and usually does not need additional surgery (unlike takedown/ligation of surgical shunts). There are several studies that evaluate TIPS before transplantation-not as a bridge/temporizing measure, but as a prelude to the transplant to decompress the portal circulation and reduce portosystemic engorgement and collaterals and thus, in theory, reduce intraoperative bleeding during liver transplantation. However, these studies, mostly in the transplant literature, have been equivocal from an intraoperative and posttransplant clinical outcome standpoint. TIPS creation in liver transplant recipients is another interesting aspect of TIPS. There has been a debate about whether or not liver transplantation adds additional technical difficulty to the TIPS procedure. Initially, many theories were proposed as to the technical difficulty of TIPS in a transplanted liver. However, recent opinions and published studies demonstrate that whole-graft liver transplantation does not pose a significant technical difficulty to TIPS. Moreover, there are several recent studies evaluating the outcomes of TIPS in liver transplant recipients, showing that outcomes are less favorable when compared with TIPS in nontransplanted patients. This article discusses the results of TIPS as a preoperative prelude to liver transplantation. In addition, it discusses the technical and clinical outcomes of TIPS in liver transplant recipients. PMID:25177084

Saad, Wael E

2014-09-01

156

A unique multipurpose damping circuit for shunt capacitor bank switching  

SciTech Connect

Considerations on disturbances related to Shunt Capacitor Bank (SCB) switching are summarized and a unique damping circuit able to cope with all of them is proposed. This damping circuit consists of a reactor in parallel with a resistor which is in series with a Metal Oxide Varistor (MOV), the latter being used to switch on the resistor only during transients. The design parameter of this damping circuit are described and the main tests performed are presented.

Sabot, A.; Morin, C.; Guillaume, C.; Pons, A. (Electricite de France, Les Renardieres (France). Les Renardieres Lab.); Taisne, J.P. (Electricite de France, Les Renardieres (France). Transmission Division); Pizzo, G.L.; Morf, H.U. (Haefely S.A., Saint Louis (France))

1993-07-01

157

Traumatic cerebral aneurysm formation following ventriculoperitoneal shunt insertion  

Microsoft Academic Search

Introduction  Iatrogenic intracranial aneurysms are rare in children.Case report  A 15-year-old girl presented in coma with a fixed dilated left pupil six weeks following removal of a long-standing left-sided ventriculoperitoneal shunt. Computed tomography (CT) and cerebral angiography revealed a left temporoparietal intracerebral haemorrhage with a fusiform distal middle cerebral artery aneurysm. The patient underwent image-guided localisation of the aneurysm to enable evacuation

Michael David Jenkinson; Surajit Basu; John C. Broome; Paul Richard Eldridge; Neil Buxton

2006-01-01

158

A face detection system using shunting inhibitory convolutional neural networks  

Microsoft Academic Search

We present a face detection system based on a class of convolutional neural networks, namely shunting inhibitory convolutional neural networks (SICoNNets). The topology of these networks is a flexible feedforward architecture with three different connections schemes: fully-connected, toeplitz-connected and binary-connected. SICoNNets were trained, using a hybrid method based on Rprop, Quickprop and least squares, to discriminate between face and non-face

F. H. C. Tivive; A. Bouzerdoum

2004-01-01

159

Valve Pressure Upgrade May Produce Progressive Deterioration of Vision in Children with Slit Ventricle Syndrome  

Microsoft Academic Search

Recently, valve upgrade and\\/or endoscopic third ventriculostomy, which have the merit of no additional shunting, were introduced for the treatment of slit ventricle syndrome, because lumboperitoneal shunting entails various complications including development of Chiari malformation, shunt malfunction, and infection. However, the safety of valve upgrading is not confirmed, especially in a child with slit ventricle syndrome developed as a result

Seoung Woo Park; Soo Han Yoon; Ki Hong Cho; Yong Sam Shin

2007-01-01

160

The double degenerate LP400-22 revisited  

E-print Network

We re-examine the properties of the high-velocity and extremely low mass white dwarf LP 400-22 and its close companion. Based on an extended observation timeline we determined a binary period of P= 1.01016 d, somewhat longer than the previously published period, and a mass function f(M_2)= 0.180 M_solar implying a mass for the companion M_2 > 0.41 M_solar. We also re-appraised the mass and cooling age of the white dwarf using low-metallicity (Z=0.001) evolutionary models appropriate for an old halo member, M_1 = 0.19 M_solar and t_cool~1.8 Gyr, and we infer a mass of 0.85 - 1.0 M_solar for the progenitor of the white dwarf. We discuss the likely origin of this system.

Vennes, S; Vaccaro, T R; Silvestri, N M

2009-01-01

161

76 FR 20971 - Eagle Rock Desoto Pipeline, L.P.; Notice of Filing  

Federal Register 2010, 2011, 2012, 2013

...ENERGY Federal Energy Regulatory Commission [Docket No. PR10-120-001] Eagle Rock Desoto Pipeline, L.P.; Notice of Filing Take notice that on April 7, 2011, Eagle Rock Desoto Pipeline, L.P. filed a revised Statement of Operating...

2011-04-14

162

75 FR 27774 - Eagle Rock Desoto Pipeline, L.P.; Notice of Rate Election  

Federal Register 2010, 2011, 2012, 2013

...Federal Energy Regulatory Commission [Docket No. PR10-22-000] Eagle Rock Desoto Pipeline, L.P.; Notice of Rate Election May 11, 2010. Take notice that on May 3, 2010, Eagle Rock Desoto Pipeline, L.P., (Desoto) filed a Notice...

2010-05-18

163

77 FR 28375 - Eagle Rock Desoto Pipeline, L.P.; Notice of Petition for Rate Approval  

Federal Register 2010, 2011, 2012, 2013

...Federal Energy Regulatory Commission [Docket No. PR12-25-000] Eagle Rock Desoto Pipeline, L.P.; Notice of Petition for Rate Approval Take notice that on May 1, 2012, Eagle Rock Desoto Pipeline, L.P. (Desoto) filed a Rate...

2012-05-14

164

75 FR 74713 - Panhandle Eastern Pipe Line Company, LP; Notice of Request Under Blanket Authorization  

Federal Register 2010, 2011, 2012, 2013

...12, 2010, Panhandle Eastern Pipe Line Company, LP (Panhandle...states that a portion of the pipe underlying Boller Lane will...Commission and open to public inspection. The filing may also be viewed...Tariffs, Panhandle Eastern Pipe Line Company, LP, 5444...

2010-12-01

165

Automated Test Assembly Using lp_Solve Version 5.5 in R  

ERIC Educational Resources Information Center

This article reviews the use of the software program lp_solve version 5.5 for solving mixed-integer automated test assembly (ATA) problems. The program is freely available under Lesser General Public License 2 (LGPL2). It can be called from the statistical language R using the lpSolveAPI interface. Three empirical problems are presented to…

Diao, Qi; van der Linden, Wim J.

2011-01-01

166

DCaseLP: a Prototyping Environment for Multi-Language Agent Systems  

E-print Network

-Oriented Software En- gineering, Rapid Prototyping. 1 Introduction The correct and efficient engineeringDCaseLP: a Prototyping Environment for Multi-Language Agent Systems Viviana Mascardi, Maurizio@yahoo.it Abstract. This paper describes DCaseLP, a multi-language prototyping en- vironment for Multi-Agent Systems

Mascardi, Viviana

167

76 FR 28026 - TransCanada Keystone Pipeline, LP; Notice of Request for Waiver  

Federal Register 2010, 2011, 2012, 2013

...Docket No. OR11-7-000] TransCanada Keystone Pipeline, LP; Notice of Request for Waiver Take notice that on May 2, 2011, TransCanada Keystone Pipeline, LP (TransCanada Keystone) filed a request for waiver of the...

2011-05-13

168

78 FR 26358 - TransCanada Keystone Pipeline, LP; Notice of Petition for Declaratory Order  

Federal Register 2010, 2011, 2012, 2013

...Commission [Docket No. OR13-17-000] TransCanada Keystone Pipeline, LP; Notice of Petition for Declaratory Order Take...CFR 385.207(a)(2)(2012), TransCanada Keystone Pipeline, LP filed a petition seeking a declaratory...

2013-05-06

169

FBSDE with time delayed generators: Lp-solutions, differentiability, representation formulas and path regularity  

E-print Network

FBSDE with time delayed generators: Lp-solutions, differentiability, representation formulas equations with time delayed generators (delay BSDE). We provide sharper a priori estimates and show that the solution of a delay BSDE is in Lp . We introduce decoupled systems of SDE and delay BSDE (which we term

Boyer, Edmond

170

77 FR 74182 - Magic Valley Pipeline, L.P.; Notice of Petition for Rate Approval  

Federal Register 2010, 2011, 2012, 2013

...Regulatory Commission [Docket No. PR13-14-000] Magic Valley Pipeline, L.P.; Notice of Petition...Approval Take notice that on November 30, 2012, Magic Valley Pipeline, L.P. (Magic Valley) filed a petition for rate approval...

2012-12-13

171

Immunological crossreactivity between Lp(a) and the third component of complement  

SciTech Connect

Lipoprotein(a) (Lp(a)) is known to be an independent risk factor for atherosclerosis, yet little is known about its physiological role. During the authors investigation of the site of synthesis of Lp(a), they made the observation that the third component of complement (C3) reacts with antisera to Lp(a). Hep G-2 cells or rhesus liver organ cultures were labelled using TVS-methionine in serum-free, methionine-free DMEM. The labelled media were immunoprecipitated with antisera raised in the goat and the rabbit against Lp(a) and apolipoprotein(a) (apo(a)). The immunoprecipitates were subjected to electrophoresis on 2.5 - 16% gradient gels and visualized by autoradiography. All antisera consistently precipitated a significant amount of C3. This reaction with C3 could be inhibited by competition with pure preparations of Lp(a) and apo(a) or by preincubation of the medium with antiserum to C3. In addition, immunoprecipitation of C3 by anti-C3 was inhibited by competition with both apo(a) and Lp(a). No cross-reactivity was observed with antisera to apoB, apoE, normal rabbit serum, or purified non-specific rabbit IgG. This unexpected crossreactivity between Lp(a) and C3, observed in vitro, may have biological relevance and suggests a possible relationship between Lp(a) and the immune system.

Fless, G.M.; ZumMallen, M.E.

1987-05-01

172

Dramatic lowering of very high Lp(a) in response to niacin.  

PubMed

We describe a patient with markedly elevated lipoprotein(a) (Lp(a)) without any other lipid abnormalities. After a myocardial infarction, she was treated with combination of extended-release niacin and statin. An 88% reduction in Lp(a) was observed during 5 years of treatment, which is much better response than usually reported. PMID:25110227

Li, Min; Saeedi, Ramesh; Rabkin, Simon W; Frohlich, Jiri

2014-01-01

173

Post Blalock-Taussig shunt mediastinal mass - a single shadow with two different destinies  

PubMed Central

The modified Blalock–Taussig shunt is a synthetic shunt between the subclavian and pulmonary artery, used in the treatment of congenital cyanotic heart diseases with pulmonary hypoperfusion. Delayed complications include progressive failure of the shunt, serous fluid leak, and pseudoaneurysm formation. We report two different and rare mediastinal vascular complications following modified BT shunt surgery in this case report. The first one is a seroma, due to serous fluid leakage through the shunt graft, which is a relatively benign complication. The second one is a pseudoaneurysm, arising from the shunt, a frequently fatal complication. Generally, X-ray chest is used for screening in these patients. CT angiography plays a vital role in the diagnosis of both these conditions. Management in pseudoaneurysm should be aggressive, as timely intervention may be life saving, while in seroma the management is most often conservative occasionally requiring surgical intervention. PMID:24814123

Rohit, Manoj Kumar; Vadivelu, Ramalingam; Khandelwal, Niranjan; Krishna, Satheesh

2014-01-01

174

The runaway binary LP 400-22 is leaving the Galaxy  

NASA Astrophysics Data System (ADS)

We present optical spectroscopy, astrometry, radio and X-ray observations of the runaway binary LP 400-22. We refine the orbital parameters of the system based on our new radial velocity observations. Our parallax data indicate that LP 400-22 is significantly more distant (3? lower limit of 840 pc) than initially predicted. LP 400-22 has a tangential velocity in excess of 830 km s-1; it is unbound to the Galaxy. Our radio and X-ray observations fail to detect a recycled millisecond pulsar companion, indicating that LP 400-22 is a double white dwarf system. This essentially rules out a supernova runaway ejection mechanism. Based on its orbit, a Galactic Centre origin is also unlikely. However, its orbit intersects the locations of several globular clusters; dynamical interactions between LP 400-22 and other binary stars or a central black hole in a dense cluster could explain the origin of this unusual binary.

Kilic, Mukremin; Gianninas, A.; Brown, Warren R.; Harris, Hugh C.; Dahn, Conard C.; Agüeros, M. A.; Heinke, Craig O.; Kenyon, S. J.; Panei, J. A.; Camilo, Fernando

2013-10-01

175

Reducing the incidence of infection in pediatric cerebrospinal fluid shunt operations  

Microsoft Academic Search

We reviewed our experience with shunt implantation during two time periods. From June 1985 to December 1990, 201 children\\u000a with hydrocephalus underwent 382 operations. Among these children 36 (18%) developed a proven shunt infection, with an incidence\\u000a rate per procedure of 9.4%. As a result of this study, a new effective protocol for shunt procedures involving modifications\\u000a to the perioperative

K. Rotim; P. Miklic; J. Paladino; A. Melada; M. Marcikic; M. Scap

1997-01-01

176

Perioperative risk factors for short term shunt revisions in adult hydrocephalus patients  

Microsoft Academic Search

Objectives:The aim of this study was to prospectively study perioperative variables associated with revision after shunt surgery for adult hydrocephalus.Methods:Two protocols were designed to prospectively study perioperative risk factors during shunt insertion. Over 10 years (1995–2004), 450 adult (age >16 years) patients with first time shunt implantations were studied. Patients who had been treated with endoscopic third ventriculostomy were excluded

D Farahmand; H Hilmarsson; M Högfeldt; M Tisell

2009-01-01

177

Embolization of portal-systemic shunts in cirrhotic patients with chronic recurrent hepatic encephalopathy  

SciTech Connect

Purpose. To evaluate the efficacy of embolization of portal-systemic shunts in cirrhotic patients with chronic recurrent hepatic encephalopathy (CRHE). Methods. Seven cirrhotic patients with CRHE refractory to medical treatment (3 men and 4 women, mean age 66 years) were studied. Five patients had splenorenal shunts, 1 had a gastrorenal shunt, and 1 had an intrahepatic portal vein-hepatic vein shunt. Shunt embolization was performed using stainless steel coils, with a percutaneous transhepatic portal vein approach in 4 patients and a transrenal vein approach in 3 patients. Results. After embolization, the shunt disappeared in 4 patients on either ultrasound pulsed Doppler monitoring or portography. Complications observed in the 7 patients were fever, transient pleural effusion, ascites, and mild esophageal varices. For 3-6 months after embolization, the 4 patients whose shunts disappeared showed minimal or no reappearance of a shunt, and had no recurrence of encephalopathy. The serum ammonia levels decreased and electroencephalograms also improved. One of the 4 patients, who developed mild esophageal varices, required no treatment. Treatment was effective in 3 of the 4 patients (75%) who underwent embolization via a transhepatic portal vein. Conclusion. Transvascular embolization of shunts improved the outcome in 4 of 7 patients. The most effective embolization was achieved via the percutaneous transhepatic portal vein approach.

Sakurabayashi, Shin; Sezai, Shuichi; Yamamoto, Yoshihiro; Hirano, Masanori; Oka, Hiroshi [Tokyo Metropolitan Police Hospital, Division of Gastroenterology (Japan)

1997-03-15

178

78 FR 62931 - Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...Inc. by Emergence Capital Partners, Inc. will not occur at the...financing by Emergence Capital Partners, L.P. and Emergence Capital...Associates of Emergence Capital Partners SBIC, L.P., and therefore...BILLING CODE...

2013-10-22

179

78 FR 42516 - Iroquois Gas Transmission System, L.P.; Notice of Intent To Prepare an Environmental Impact...  

Federal Register 2010, 2011, 2012, 2013

...Commission [Docket No. CP13-502-000] Iroquois Gas Transmission System, L.P.; Notice...impacts of two related projects proposed by Iroquois Gas Transmission System, L.P. (Iroquois) and Constitution Pipeline Company,...

2013-07-16

180

78 FR 48177 - Purdue Pharma L.P.; Withdrawal of Approval of a New Drug Application for Oxycontin  

Federal Register 2010, 2011, 2012, 2013

...Administration [Docket No. FDA-2013-N-0883] Purdue Pharma L.P.; Withdrawal of Approval of a New Drug Application for...hydrochloride) Extended-Release Tablets, held by Purdue Pharma L.P. (Purdue), One Stamford Forum, Stamford, CT...

2013-08-07

181

77 FR 25133 - Foreign-Trade Zone 126, Temporary/Interim Manufacturing Authority, Brightpoint North America L.P...  

Federal Register 2010, 2011, 2012, 2013

...Manufacturing Authority, Brightpoint North America L.P. (Cell Phone Kitting and Distribution); Notice of Approval On March...behalf of Brightpoint North America L.P., to produce cell phone kits under FTZ procedures within FTZ 126--Site...

2012-04-27

182

77 FR 33716 - Foreign-Trade Zone 70-Detroit, MI; Expansion of Subzone; Marathon Petroleum Company LP, (Oil...  

Federal Register 2010, 2011, 2012, 2013

...Foreign-Trade Zone 70--Detroit, MI; Expansion of Subzone; Marathon Petroleum Company LP, (Oil Refinery) Detroit, MI An application...70, requesting an expansion of Subzone 70T, on behalf of Marathon Petroleum Company LP in Detroit, Michigan. The...

2012-06-07

183

77 FR 58824 - Gulf Shore Energy Partners, LP; Notice of Intent To Prepare an Environmental Assessment for the...  

Federal Register 2010, 2011, 2012, 2013

...Commission [Docket No. CP12-520-000] Gulf Shore Energy Partners, LP; Notice of Intent To Prepare...construction and operation of facilities by Gulf Shore Energy Partners, LP (Gulf Shore) in Matagorda County, Texas. The...

2012-09-24

184

The epidemiology of Lp-PLA 2: Distribution and correlation with cardiovascular risk factors in a population-based cohort  

Microsoft Academic Search

Lipoprotein-associated phospholipase A2 (Lp-PLA2) is an enzyme that is produced by inflammatory cells (macrophages, T-lymphocytes and mast cells) and hydrolyzes oxidized phospholipids in LDL. Several epidemiology studies indicate that Lp-PLA2 appears to be an independent marker of cardiovascular risk. This study was conducted to define the distribution of Lp-PLA2 in a large population-based cohort and to determine associations between Lp-PLA2

Margaretha Persson; Jan-Åke Nilsson; Jeanenne J. Nelson; Bo Hedblad; Göran Berglund

2007-01-01

185

77 FR 75489 - Hatteras Venture Partners IV SBIC, L.P.; Application No. 99000769; Notice Seeking Exemption Under...  

Federal Register 2010, 2011, 2012, 2013

...BUSINESS ADMINISTRATION Hatteras Venture Partners IV SBIC, L.P.; Application No...is hereby given that Hatteras Venture Partners IV SBIC, L.P., 280 South Mangum...13 CFR 107.730). Hatteras Venture Partners IV SBIC, L.P. proposes to...

2012-12-20

186

77 FR 42353 - Escalate Capital Partners SBIC I, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...No. 06/06-0335] Escalate Capital Partners SBIC I, L.P.; Notice Seeking Exemption...is hereby given that Escalate Capital Partners SBIC I, L.P., 300 West 6th Street...13 CFR 107.730). Escalate Capital Partners SBIC I, L.P. proposes to make a...

2012-07-18

187

76 FR 28843 - Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...09/79-0454] Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption...is hereby given that Emergence Capital Partners SBIC, L.P., 160 Bovet Road, Suite...13 CFR 107.730). Emergence Capital Partners SBIC, L.P. proposes to provide...

2011-05-18

188

75 FR 22435 - Pharos Capital Partners II, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...No. 06/76-0329] Pharos Capital Partners II, L.P.; Notice Seeking Exemption...Notice is hereby given that Pharos Capital Partners II, L.P., 1 Burton Hills Boulevard...13 CFR 107.730). Pharos Capital Partners II, L.P. proposes to sell its...

2010-04-28

189

77 FR 14853 - Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...09/79-0454] Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption...is hereby given that Emergence Capital Partners SBIC, L.P., 160 Bovet Road, Suite...13 CFR 107.730). Emergence Capital Partners SBIC, L.P. proposes to provide...

2012-03-13

190

76 FR 9630 - Convergent Capital Partners II, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...05/05-0293] Convergent Capital Partners II, L.P.; Notice Seeking Exemption...hereby given that Convergent Capital Partners II, L.P., 505 North Highway 169...CFR 107.730). Convergent Capital Partners II, L.P., proposes to provide...

2011-02-18

191

75 FR 45178 - Escalate Capital Partners SBIC I, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...BUSINESS ADMINISTRATION Escalate Capital Partners SBIC I, L.P.; Notice Seeking Exemption...is hereby given that Escalate Capital Partners SBIC I, L.P., 300 W. 6th Street...13 CFR 107.730). Escalate Capital Partners SBIC I, L.P. proposes to...

2010-08-02

192

75 FR 32230 - Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...09/79-0454] Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption...is hereby given that Emergence Capital Partners SBIC, L.P., 160 Bovet Road, Suite...13 CFR 107.730). Emergence Capital Partners SBIC, L.P. proposes to provide...

2010-06-07

193

77 FR 38125 - Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...09/79-0454] Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption...is hereby given that Seacoast Capital Partners III, L.P., 555 Ferncroft Road...13 CFR 107.730). Seacoast Capital Partners III, L.P., proposes to provide...

2012-06-26

194

76 FR 18821 - Convergent Capital Partners II, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...05/05-0293] Convergent Capital Partners II, L.P.; Notice Seeking Exemption...hereby given that Convergent Capital Partners II, L.P., 505 North Highway 169...Regulations (13 CFR 107). Convergent Capital Partners II, L.P., proposes to provide...

2011-04-05

195

77 FR 72430 - Salem Investment Partners III, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...No. 04/04-0315] Salem Investment Partners III, L.P.; Notice Seeking Exemption...is hereby given that Salem Investment Partners III, L.P., 1348 Westgate Center...13 CFR 107.730). Salem Investment Partners III, L.P. proposes to provide...

2012-12-05

196

76 FR 74115 - Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...730). Emergence Capital Partners SBIC, L.P. proposes to...Regulations because Emergence Capital Partners, L.P. and Emergence Capital...Associates of Emergence Capital Partners SBIC, L.P., own in the...8:45 am] BILLING CODE...

2011-11-30

197

76 FR 21936 - Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...Regulations because Emergence Capital Partners, L.P. and Emergence Capital...Associates of Emergence Capital Partners SBIC, L.P., own in aggregate...Associate of Emergence Capital Partners SBIC, L.P. and the transaction...8:45 am] BILLING CODE...

2011-04-19

198

76 FR 619 - Escalate Capital Partners SBIC I, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...No. 06/06-0335] Escalate Capital Partners SBIC I, L.P.; Notice Seeking Exemption...is hereby given that Escalate Capital Partners, SBIC I, L.P., 300 W. 6th Street...13 CFR 107.730). Escalate Capital Partners, SBIC I, L.P. proposes to...

2011-01-05

199

75 FR 39588 - Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...09/79-0454] Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption...is hereby given that Emergence Capital Partners SBIC, L.P., 160 Bovet Road, Suite...13 CFR 107.730). Emergence Capital Partners SBIC, L.P. proposes to provide...

2010-07-09

200

78 FR 4189 - Harbert Mezzanine Partners III SBIC, L.P.; Notice Seeking Exemption Under Section 312 of the...  

Federal Register 2010, 2011, 2012, 2013

...Application No. 99000720] Harbert Mezzanine Partners III SBIC, L.P.; Notice Seeking Exemption...is hereby given that Harbert Mezzanine Partners III SBIC, L.P., 2100 Third Avenue...13 CFR 107.730). Harbert Mezzanine Partners III SBIC, L.P. proposes to...

2013-01-18

201

76 FR 25732 - Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...Regulations because Emergence Capital Partners, L.P. and Emergence Capital...Associates of Emergence Capital Partners SBIC, L.P., own more than...Associate of Emergence Capital Partners SBIC, L.P. and this transaction...8:45 am] BILLING CODE...

2011-05-05

202

76 FR 1491 - Emergence Capital Partners SBIC, L.P. License No. 09/79-0454; Notice Seeking Exemption Under...  

Federal Register 2010, 2011, 2012, 2013

...BUSINESS ADMINISTRATION Emergence Capital Partners SBIC, L.P. License No. 09/79-0454...is hereby given that Emergence Capital Partners SBIC, L.P., 160 Bovet Road, Suite...13 CFR 107.730). Emergence Capital Partners SBIC, L.P. proposes to provide...

2011-01-10

203

75 FR 13802 - Emergence Capital Partners SBIC, L.P. License No. 09/79-0454; Notice Seeking Exemption Under...  

Federal Register 2010, 2011, 2012, 2013

...BUSINESS ADMINISTRATION Emergence Capital Partners SBIC, L.P. License No. 09/79-0454...is hereby given that Emergence Capital Partners SBIC, L.P., 160 Bovet Road, Suite...13 CFR 107.730). Emergence Capital Partners SBIC, L.P. proposes to provide...

2010-03-23

204

76 FR 68803 - Escalate Capital Partners SBIC I, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...107.730). Escalate Capital Partners, SBIC I, L.P. proposes to...the Regulations because AV-EC Partners I L.P., an Associate of Escalate Capital Partners, SBIC I, L.P., owns more...am] BILLING CODE...

2011-11-07

205

78 FR 57444 - Eagle Fund III-A, L.P.; Notice Seeking Exemption Under the Small Business Investment Act...  

Federal Register 2010, 2011, 2012, 2013

...ADMINISTRATION [License No. 07/07-0117] Eagle Fund III-A, L.P.; Notice Seeking...of Interest Notice is hereby given that Eagle Fund III-A, L.P., 101 S. Hanley...SBA'') Rules and Regulations. Eagle Fund III-A, L.P., provided...

2013-09-18

206

78 FR 57444 - Eagle Fund III, L.P.; Notice Seeking Exemption Under the Small Business Investment Act, Conflicts...  

Federal Register 2010, 2011, 2012, 2013

...ADMINISTRATION [License No. 07/07-0116] Eagle Fund III, L.P.; Notice Seeking Exemption...of Interest Notice is hereby given that Eagle Fund III, L.P., 101 S. Hanley Road...SBA'') Rules and Regulations. Eagle Fund III, L.P., provided debt...

2013-09-18

207

[Results of classic carotid endarterectomy using temporary carotid shunt].  

PubMed

The main method of elimination of stenosis of carotid arteries in atherosclerosis is the surgical operation. Meanwhile, there is no general opinion concerning the most efficient way of the performance of the operation. This research generalized an experience of performing the classic carotid endarterectomy with usage the temporary shunt and an autovenous patch in 167 patients. The most frequent complications were analyzed in standard groups. The advantages of the given method were determined, facilitating to the reduction of intraoperative risks and the increase of technical quality of performance of different stages of the operation. The work quotes 8 works. PMID:24340966

Mikha?lov, I V; Gusinski?, A V; Drozhzhin, I G; Perrevalov, E A

2013-01-01

208

Lhermitte's sign in alcoholic myelopathy without portosystemic shunting: MRI evaluation.  

PubMed

We conducted spinal MR imaging on a 35-year-old man with Lhermitte's sign that had manifested over the previous 4 years. He had consumed more than 500 ml of whisky daily for at least 10 years. However, he did not show any evidence of severe liver disease with hepato-systemic blood shunting. Neurologic examination revealed markedly depressed sense of vibration in the feet and mild spasticity in the lower limbs, together with Lhermitte's sign. MR imaging revealed abnormal signal intensity in the posterior column spanning the whole length of the upper cervical cord, which is consistent with Lhermitte's sign. PMID:15750278

Imai, Tomihiro; Tsuda, Emiko; Suzuki, Mikiya; Hozuki, Takayoshi; Matsumoto, Hiroyuki

2005-02-01

209

Piezoelectric vibration damping using resonant shunt circuits: an exact solution  

NASA Astrophysics Data System (ADS)

The objective of this paper is to propose an exact closed-form solution to the {{H}? } optimization of piezoelectric materials shunted with inductive-resistive passive electrical circuits. Realizing that Den Hartog?s method which imposes fixed points of equal height in the receptance transfer function is approximate, the parameters of the piezoelectric tuned vibration absorber are calculated through the direct minimization of the maxima of the receptance. The method is applied to a one-degree-of-freedom primary oscillator considering various values of the electromechanical coupling coefficients.

Soltani, P.; Kerschen, G.; Tondreau, G.; Deraemaeker, A.

2014-12-01

210

A modified procedure for transjugular intrahepatic portosystemic shunt flow reduction.  

PubMed

The authors present a modified transjugular intrahepatic portosystemic shunt (TIPS) flow reduction procedure to treat TIPS-related refractory hepatic encephalopathy, giving the results and follow-up on six patients. A 6-mm-diameter Uni Wallstent was introduced over a guide wire and deployed beyond the angulated portion of the TIPS. A Wallgraft was then introduced over the same guide wire, pushed through the Uni Wallstent coaxially, and deployed in the TIPS. All cases were technically and clinically successful. There were no deaths in the first month after the procedure. In this study, three patients had more than 1 year's patency. PMID:16923985

Jacquier, Alexis; Vidal, Vincent; Monnet, Olivier; Varoquaux, Arthur; Gaubert, Jean-Yves; Champsaur, Pierre; Gerolami, Rene; Bartoli, Jean-Michel; Moulin, Guy

2006-08-01

211

Sequential Primary and Secondary Shunt Metabolism in Penicillium chrysogenum1  

PubMed Central

Penicillium chrysogenum was grown on a rich medium and on a more sparse medium which favored penicillin production. Mycelia grown on both media were examined for changes in lipid, mannitol, erythritol, glycerol, pentitol, trehalose, and residual mycelium, and the filtrates were examined for penicillin. Penicillin production took place after the bulk of trehalose, polyol, and lipid had accumulated, and hence the sequential pattern of primary and secondary shunt metabolism, as observed in the case of ergot alkaloid production by Claviceps purpurea, was demonstrated in this example of penicillin production. PMID:14341595

Taber, W. A.; Tertzakian, G.

1965-01-01

212

Optical manipulation of biological particles using LP21 mode in fiber  

NASA Astrophysics Data System (ADS)

We demonstrate the optical manipulation of biological particles using a low-order LP21 fiber mode. The focused four-lobed LP21 mode distribution was theoretically and experimentally found to be effective in optical tweezer applications, including selective cellular pick-up, pairing, grouping or separation, as well as rotation of cell dimers and clusters. Our proposed theoretical model estimates both the translational dragging force and rotational torque in good accordance with experimental data. With a simple all-fiber configuration, and low peak irradiation to target bioparticles, the proposed LP21 ‘optical chuck’ system has great application potential in biological test systems.

Chen, Shijie; Huang, He; Zou, Hongmei; Li, Qing; Fu, Jian; Lin, Feng; Wu, X.

2014-12-01

213

Neural Network Based Modeling and Analysis of LP Control Surface Allocation  

NASA Technical Reports Server (NTRS)

This paper presents an approach to interpretive modeling of LP based control allocation in intelligent flight control. The emphasis is placed on a nonlinear interpretation of the LP allocation process as a static map to support analytical study of the resulting closed loop system, albeit in approximate form. The approach makes use of a bi-layer neural network to capture the essential functioning of the LP allocation process. It is further shown via Lyapunov based analysis that under certain relatively mild conditions the resulting closed loop system is stable. Some preliminary conclusions from a study at Ames are stated and directions for further research are given at the conclusion of the paper.

Langari, Reza; Krishnakumar, Kalmanje; Gundy-Burlet, Karen

2003-01-01

214

Hepatic cyst associated with ventriculoperitoneal shunt in a child with brain tumor  

Microsoft Academic Search

A 12-year-old boy with a thalamic grade IV astrocytoma and ventriculoperitoneal (VP) shunt developed epigastric pain and symptoms of increased intracranial pressure. The SGOT and alkaline phosphatase levels were markedly elevated and the radiological studies showed a cyst in the right lobe of the liver, extending to the porta hepatis. Simple repositioning of the shunt resulted in complete resolution of

Sohail R. Rana; Eric S. Quivers; Theresa B. Haddy

1985-01-01

215

Antibiotic-Impregnated Shunt Catheters for the Treatment of Infantile Hydrocephalus  

Microsoft Academic Search

Introduction: Antibiotic-impregnated shunt (AIS) components decrease shunt infections by preventing bacterial colonization that occurs during implantation. Despite studies showing improved efficacy in preventing infection however, concern still exists regarding using AIS components in infants, especially premature ones. In this study, clinical outcomes were assessed in infants with hydrocephalus (<1 year) following AIS placement. Methods: A prospective observational study was conducted

Daniel M. Sciubba; Joseph C. Noggle; Benjamin S. Carson; George I. Jallo

2008-01-01

216

Interatrial septal mobility predicts larger shunts across patent foramen ovales: An analysis with transmitral Doppler scanning  

Microsoft Academic Search

Background The association of patent foramen ovale (PFO) with cryptogenic stroke is strongest in patients with larger shunts and patients with atrial septal aneurysms (ASAs). We postulated that the potency of ASA as a risk factor for stroke relates to the size of shunt across PFOs associated with mobile atrial septae. The purpose of this study was to investigate the

Ervin R. Fox; Michael H. Picard; Chi-Ming Chow; Robert A. Levine; Lee Schwamm; Andrew J. Kerr

2003-01-01

217

Two Episodes of Ventriculoperitoneal Shunt Migration in a Patient with Idiopathic Intracranial Hypertension  

PubMed Central

Introduction. Ventriculoperitoneal shunts are often placed as treatment for refractory idiopathic intracranial hypertension. Dislodgement and migration of the distal portion of the shunt are more common in obese patients and can be difficult to detect. We report the case of a woman with two separate episodes of shunt migration into her abdominal wall. Case Presentation. We report a case of a 37-year-old female with history of obesity eventually diagnosed with idiopathic intracranial hypertension (IIH) as the cause. She failed outpatient therapy and, through neurosurgery, had a VP shunt placed for symptom control. She had subsequent development of worsened symptoms that were found to be due to shunt migration. This happened not once but twice to the same patient. Conclusion. Shunt dislodgement, migration, and subsequent failure are common in obese patients who have shunts placed for IIH. The medical provider should maintain a high index of suspicion for shunt malfunction in these patients, particularly because clinical evaluation may be challenging due to habitus. PMID:24829841

Balakrishnan, V.; Jeanmonod, R.

2014-01-01

218

Electroacoustic absorbers: bridging the gap between shunt loudspeakers and active sound absorption.  

PubMed

The acoustic impedance at the diaphragm of an electroacoustic transducer can be varied using a range of basic electrical control strategies, amongst which are electrical shunt circuits. These passive shunt techniques are compared to active acoustic feedback techniques for controlling the acoustic impedance of an electroacoustic transducer. The formulation of feedback-based acoustic impedance control reveals formal analogies with shunt strategies, and highlights an original method for synthesizing electric networks ("shunts") with positive or negative components, bridging the gap between passive and active acoustic impedance control. This paper describes the theory unifying all these passive and active acoustic impedance control strategies, introducing the concept of electroacoustic absorbers. The equivalence between shunts and active control is first formalized through the introduction of a one-degree-of-freedom acoustic resonator accounting for both electric shunts and acoustic feedbacks. Conversely, electric networks mimicking the performances of active feedback techniques are introduced, identifying shunts with active impedance control. Simulated acoustic performances are presented, with an emphasis on formal analogies between the different control techniques. Examples of electric shunts are proposed for active sound absorption. Experimental assessments are then presented, and the paper concludes with a general discussion on the concept and potential improvements. PMID:21568400

Lissek, Hervé; Boulandet, Romain; Fleury, Romain

2011-05-01

219

Selection of capacitors for the self regulated short shunt self excited induction generator  

Microsoft Academic Search

The self regulating feature of a self-excited induction generator (SEIG) by connecting additional capacitors is examined. A system consisting of both shunt and series capacitors has been analyzed. A methodology has been explained to choose an appropriate set of values of these capacitors for desired voltage regulation. Performance of short and long shunt configurations has been compared which shows the

L. Shridhar; B. Singh; C. S. Jha; S. S. Murthy

1995-01-01

220

Electromagnetic Shunt Damping S. Behrens A. J. Fleming S. O. Reza Moheimani  

E-print Network

Electromagnetic Shunt Damping S. Behrens A. J. Fleming S. O. Reza Moheimani School of Electricalqhzfdvwoh1hgx1dx Abstract A method for electromagnetic shunt damping (EMSD) will be presented in this paper. A passive control strategy is validated through experi- mentation on a simple electromagnetic mass

Fleming, Andrew J.

221

A new therapy for refractory partial epilepsy: current shunt.  

PubMed

A large number of epileptic patients suffer from refractory epilepsy, despite optimal treatment; thus these patients require new therapeutic approaches. Focal seizure activity is typically initiated in a fixed and localized region, which subsequently spreads to neighboring regions or more distant areas. At the initial onset of a seizure, the epileptic discharge will generate a relatively high voltage in seizure focus, and the discharge subsequently spreads to other relatively low-voltage regions. However, it is unknown whether seizure can be controlled through current shunt using a conduction microelectrode to conduct the epileptic discharge with a relatively high voltage in the seizure focus outside the brain. The current therapies for epilepsy, including drugs, resective surgery and neuromodulation, focus on inhibiting abnormal excessive or synchronous neuronal activity to control seizures; thus, the basic mechanism underlying these therapies is "inhibition". In contrast, we proposed a "conduction" mechanism, whereby a current shunt with conduction electrode is used to control seizures. To our knowledge, this therapeutic strategy has not been previously reported, and we propose that this approach might be an alternative choice for the treatment of refractory partial epilepsy in the future. PMID:23948600

Zhang, Limin; Liang, Shuli; Zhang, Guojun; Kang, Xixiong

2013-11-01

222

Transjugular Intrahepatic Portosystemic Shunts in Children with Biliary Atresia  

SciTech Connect

Purpose: We retrospectively evaluated the technical and long-term clinical results of transjugularintrahepatic portosystemic shunts (TIPS) in children with portal hypertension and biliary atresia (BA). Methods: Nine children with BA and recurrent bleeding from esophagogastric and/or intestinal varices were treated by TIPS at the age of 34-156 months and followed-up in two centers. Different types of stents were used. Results: Shunt insertion succeeded in all patients, but in two a second procedure was necessary. Seven procedures lasted more than 3 hr, mainly due to difficult portal vein puncture.Variceal bleeding ceased in all patients; however, 16 reinterventions were performed in eight patients for clinical reasons (n =11) and sonographically suspected restenosis (n =5). Four patients underwent successful liver transplantation 4-51 months after TIPS and five are in good clinical conditions 64-75 months after TIPS. Conclusions: TIPS in children with BA is technically difficult, mainly due to periportal fibrosis and small portal veins. Frequency of reinterventions seems to be higher compared with adults.

Huppert, Peter E. [Department of Diagnostic Radiology, Eberhard Karls University of Tuebingen, Hoppe-Seyler-Strasse 3, D-72076 Tuebingen (Germany); Goffette, Pierre [Department of Vascular and Interventional Radiology, St. Luc University Hospital of Brussels, Av. Hippocrate 10 UCL 10/29.42, Brussels (Belgium); Astfalk, Wolfgang [Department ofPediatric Surgery, Eberhard Karls University of Tuebingen, Hoppe-Seyler Strasse 3, D-72076 Tuebingen (Germany); Sokal, Emil M. [Department ofPediatrics, St. Luc University Hospital of Brussels, Av. Hippocrate 10 UCL 10/29.42, Brussels (Belgium); Brambs, Hans-Juergen; Schott, Ullrich; Duda, Stephan H. [Department of Diagnostic Radiology, Eberhard Karls University of Tuebingen, Hoppe-Seyler-Strasse 3, D-72076 Tuebingen (Germany); Schweizer, Paul [Department of Pediatric Surgery, Eberhard Karls University of Tuebingen, Hoppe-Seyler Strasse 3, D-72076 Tuebingen (Germany); Claussen, Claus D. [Department of Diagnostic Radiology, Eberhard Karls University of Tuebingen, Hoppe-Seyler-Strasse 3, D-72076 Tuebingen (Germany)

2002-12-15

223

Nonvascular needle and shunt placements for fetal therapy.  

PubMed Central

The nonvascular placement of needles and shunts for the in utero treatment of fetuses with fluid-filled, space-occupying anomalies has been done for about 10 years. The rationale for this approach is to attempt to prevent progressive impairment of organ function or lethal damage by early decompression. Experience has taught us that the key to success in these cases is the exclusion of associated anomalies and the use of appropriate tests to assess the residual organ function at the time of first diagnosis. In fetuses with hydrothorax, shunts can prevent pulmonary hypoplasia, and in those with obstructive uropathy, they can prevent the development of progressive lung hypoplasia and renal damage before a fetus is fully viable. In fetuses with ovarian cysts, prenatal puncture is occasionally indicated, but in those with hydrocephalus, the beneficial effect of prenatal drainage is more controversial. The catheters used for in utero placement have been improved and carry a smaller risk than open fetal surgical procedures. Images PMID:8236975

Holzgreve, W; Evans, M I

1993-01-01

224

Transjugular Intrahepatic Portosystemic Shunt (TIPS): Current Status and Future Possibilities  

SciTech Connect

Since the insertion of the first TIPS in 1989 much has been learned about this therapeutic procedure. It has an established role for the treatment of some complications of portal hypertension: prevention of recurrent variceal bleeding and rescue of patients with acute uncontrollable variceal bleeding. In addition TIPS is useful for Budd-Chiari syndrome, refractory ascites and hepatorenal syndrome, although its specific role in these indications remains to be definitively established. However, the decrease in sinusoidal blood flow induced by TIPS can lead to the patient developing hepatic encephalopathy and liver failure in some cases. Therefore, TIPS should be used with caution in patients with very poor liver function. From a technical point of view, successful placement of TIPS is achieved in more than 98% of cases by experienced groups. At present, evaluation of TIPS dysfunction based on morphology probably leads to an overdiagnosis of this complication since most of these cases are not associated with clinical manifestations (recurrent bleeding or refractory ascites). The major disadvantage of TIPS remains its poor long-term patency requiring a mandatory surveillance program. The indicator for shunt function/malfunction should be the portosystemic pressure gradient, which is best assessed by intravascular measurements. Shunt obstructions may be prevented or reduced by the use of stent-grafts in the future.

Bilbao, Jose Ignacio [Department of Radiology, Clinica Universitaria, Facultad de Medicina, Universidad de Navarra, Avenida Pio XII no. 36, E-31008 Pamplona (Spain); Quiroga, Jorge; Herrero, Jose Ignacio [Department of Internal Medicine-Hepatology, Clinca Universitaria, Universidad de Navarra, Pamplona (Spain); Benito, Alberto [Department of Radiology, Clinica Universitaria, Facultad de Medicina, Universidad de Navarra, Avenida Pio XII no. 36, E-31008 Pamplona (Spain)

2002-08-15

225

Treatment of symptomatic interhemispheric arachnoid cysts by cystoperitoneal shunting.  

PubMed

Arachnoid cysts (AC) located within the interhemispheric fissure are rare, frequently associated with agenesis or hypogenesis of the corpus callosum. The optimal method for surgical treatment is under debate. In this study, we retrospectively reviewed the clinical results of seven infants (five males, two females; mean age, 5.1 months) with large interhemispheric AC who underwent cystoperitoneal shunting (CP) and evaluated the long-term efficacy in terms of clinical data, psychomotor development and neuroimaging. All patients were symptomatic and operated on before they reached 1 year of age. In three patients, additional ventricular catheters were inserted due to concomitant hydrocephalus. The additional catheters were joined with the cyst catheters and the peritoneal catheters with Y-shaped connectors in the same session. The patients were followed up for an average of 57 months (range 24-120 months). The clinical and developmental outcome was good in most patients with complete resolution of symptoms and signs. The developmental outcome scale, which included cognitive and psychomotor development, was "good" (normal) or "fair" (near normal) for six of seven patients. Radiologically, the cyst was completely or nearly totally resolved in five patients, and partially resolved in two. In these symptomatic patients with interhemispheric AC, CP shunting provided favorable treatment outcomes with complete or near-total resolution of symptoms and reduction in cyst size or disappearance of the cyst. PMID:20303760

Ulu, Mustafa Onur; Kafadar, Ali Metin; Dashti, Reza; I?ler, Cihan; Uluda?, Seyfettin; Erdinçler, Pamir

2010-06-01

226

Band gap control of phononic beam with negative capacitance piezoelectric shunt  

NASA Astrophysics Data System (ADS)

Periodic arrays of negative capacitance shunted piezoelectric patches are employed to control the band gaps of phononic beams. The location and the extent of induced band gap depend on the mismatch in impedance generated by each patch. The total impedance mismatch is determined by the added mass and stiffness of each patch as well as the shunting electrical impedance. Therefore, the band gap of the shunted phononic beam can be actively tuned by appropriately selecting the value of negative capacitance. The control of the band gap of phononic beam with negative capacitive shunt is demonstrated numerically by employing transfer matrix method. The result reveals that using negative capacitive shunt to tune the band gap is effective.

Chen, Sheng-Bing; Wen, Ji-Hong; Yu, Dian-Long; Wang, Gang; Wen, Xi-Sen

2011-01-01

227

77 FR 29624 - Cheniere Creole Trail Pipeline, L.P.; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...regarding this application should be directed to Kieth Teague, Cheniere Creole Trail Pipeline, L.P., 700...TX 77002, (713) 375-5000 (phone), keith.teague@cheniere.com or Lisa M. Tonery, Fulbright & Jaworski,...

2012-05-18

228

76 FR 65507 - Notice of Petition for Rate Approval; Eagle Ford Midstream, LP  

Federal Register 2010, 2011, 2012, 2013

...Notice of Petition for Rate Approval; Eagle Ford Midstream, LP Take notice that on October 11, 2011, (Eagle Ford) filed a petition for rate approval...baseline Statement of Operating Conditions. Eagle Ford states that it is an existing...

2011-10-21

229

76 FR 82040 - Canexus Chemicals Canada L.P. v. BNSF Railway Company  

Federal Register 2010, 2011, 2012, 2013

...Chemicals Canada L.P. v. BNSF Railway Company, Docket No. NOR 42131...issue an order compelling BNSF Railway Company (BNSF) to establish...BNSF's proposed interchange points...2011, UP, Canadian Pacific Railway Company (CP),\\2\\...

2011-12-29

230

78 FR 66758 - Accreditation and Approval of Saybolt, LP, as a Commercial Gauger  

Federal Register 2010, 2011, 2012, 2013

...LP, has been approved to gauge petroleum and petroleum products for customs purposes for the next three years as...FL, has been approved to gauge petroleum and petroleum products for customs purposes, in accordance with the...

2013-11-06

231

77 FR 50145 - Approval of Saybolt LP, as a Commercial Gauger  

Federal Register 2010, 2011, 2012, 2013

...19 CFR 151.13, Saybolt LP, 120 West Highway 30, Gonzales, LA 70737, has been approved to gauge petroleum, petroleum products, organic chemicals and vegetable oils for customs purposes, in accordance with the provisions of 19 CFR...

2012-08-20

232

75 FR 38514 - Application to Export Electric Energy; Brookfield Energy Marketing LP  

Federal Register 2010, 2011, 2012, 2013

...electric utilities, Federal power marketing agencies and other...BEM LP application to export electric energy to Canada should be clearly...the reliability of the U.S. electric power supply system. Copies of this...

2010-07-02

233

76 FR 70040 - Airworthiness Directives; Gulfstream Aerospace LP (Type Certificate Previously Held by Israel...  

Federal Register 2010, 2011, 2012, 2013

...Israel Aircraft Industries, Ltd.) Model Galaxy and Gulfstream G150 airplanes; and Gulfstream...Israel Aircraft Industries, Ltd.) Model Galaxy airplanes; and Gulfstream Aerospace LP...dated January 27, 2011. (2) For Model Galaxy and Gulfstream 200 airplanes: Do a...

2011-11-10

234

77 FR 64767 - Airworthiness Directives; Gulfstream Aerospace LP (Type Certificate Previously Held by Israel...  

Federal Register 2010, 2011, 2012, 2013

...Israel Aircraft Industries, Ltd.) Model Galaxy and Gulfstream 200 airplanes. The proposed...Israel Aircraft Industries, Ltd.) Model Galaxy and Gulfstream 200 airplanes. That NPRM...Review of the Gulfstream Aerospace LP Model Galaxy and Gulfstream 200 airplane service...

2012-10-23

235

76 FR 41432 - Airworthiness Directives; Gulfstream Aerospace LP (Type Certificate Previously Held by Israel...  

Federal Register 2010, 2011, 2012, 2013

...Israel Aircraft Industries, Ltd.) Model Galaxy, Gulfstream G150, and Gulfstream 200...Israel Aircraft Industries, Ltd.) Model Galaxy airplanes; and Gulfstream Aerospace LP...dated January 27, 2011. (2) For Model Galaxy and Gulfstream 200 airplanes: Do a...

2011-07-14

236

77 FR 12868 - Approval of Saybolt LP, as a Commercial Gauger  

Federal Register 2010, 2011, 2012, 2013

...SUMMARY: Notice is hereby given that, pursuant to 19 CFR 151.13, Saybolt LP, 190 James Drive East, Suite 110, St. Rose, LA 70087, has been approved to gauge petroleum, petroleum products, organic chemicals and vegetable oils for customs...

2012-03-02

237

Improved branch and bound algorithm with a comparison between different LP solvers  

Microsoft Academic Search

This paper presents a comparison of the effectiveness of different linear programming (LP) solvers when used with a branch-and-bound algorithm to find optimal solutions to mixed integer linear problems (MIP). We compare the performance of an improved implementation of the branch-and-bound algorithm with three different LP solvers in order to evaluate each one. We also compare our implementation with other

Lucio S. Barreto; Sérgio Haffner; Luís A. Pereira; Michael Bauer

2010-01-01

238

Differences in Lp(a) concentrations and apo(a) polymorphs between black and white Americans  

Microsoft Academic Search

Lp(a) concentrations in nmol\\/L and apo(a) size isoforms, expressed in terms of the relative number of apo(a) kringle 4 (K4) repeats, were determined in 3959 whites and blacks from four US. communities. Plasma Lp(a) analyses were performed by an ELISA method insensitive to apo(a) size heterogeneity and apo(a) size isoforms were determined by high resolution agarose gel electrophoresis. Allele frequen-

Santica M. Marcovina; John J. Albers; Ellen Wijsmant; ZuHui Zhang; Nicola H. Chapman; Hal Kennedy

239

TRAC-PF1 code assessment using OECD LOFT LP-FP-1 experiment  

SciTech Connect

This report assesses thermal-hydraulic aspects of LOFT LP-FP-1 experiment making use of TRAC-PF1/MOD1. LP-FP-1 experiment studies the system thermal-hydraulic and core thermal response for initial and boundary conditions similar to a large-break design basis LOCA leading to fission product release from the fuel cladding gap region. It also assesses the fission product retention effectiveness of the PWR-ECCS in best estimate conditions.

Barbero, F.J. [Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas (CIEMAT), Madrid (Spain)

1992-04-01

240

Impact of Differential Right-to-Left Shunting on Systemic Perfusion in Pulmonary Arterial Hypertension  

PubMed Central

Objectives This study aimed at identifying the ideal right-to-left shunt-fraction to improve cardiac output (CO) and systemic perfusion in pulmonary arterial hypertension (PHT). Background Atrial septostomy has been a high-risk therapeutical option for symptomatic drug-refractory patients with PHT. Results have been unpredictable due to limited knowledge of the optimal shunt-quantity. Methods In 9 dogs, an 8-mm shunt-prosthesis was inserted between the superior vena cava (SVC) and the left atrium. With pulmonary artery banding, mean (±SEM) systolic right ventricular pressure increased from 37±1 mmHg at baseline to 44±1 mmHg (moderate PHT, P=0.005) and 50±2 mmHg (severe PHT, P<0.001). Shunt-flow was adjusted by total (forcing all flow through the shunt) or partial occlusion of the SVC and partial or total clamping of the shunt. Caval-, shunt- and aortic-flow were measured by ultrasonic flow-probes. Blood gases were drawn from the aortic root and pulmonary artery. Results At severe PHT, a shunt-flow of 11±1% of CO (253±90 mL/min) increased CO significantly by 25% (1.8±0.1 to 2.4±0.2 L/min, P=0.005) causing an increase of systemic oxygen delivery index (DO2I) by 23% (309±23 to 399±32 mL/min/M2, P=0.035). Arterial O2-saturation did not change significantly until a shunt-flow of 18±2% was exceeded, causing a drop from 96±1% to 84±4% (P=0.013). At moderate PHT, CO or DO2I did not improve significantly at any shunt-flow. Conclusions In severe PHT, a shunt-flow of 11% of CO represented the ideal shunt-fraction. Augmentation of CO compensated for declined O2-saturation due to right-to-left shunting and improved DO2I. In moderate PHT, atrial septostomy is less promising. PMID:22511538

Weimar, Timo; Watanabe, Yoshiyuki; Kazui, Toshinobu; Lee, Urvi S.; Montecalvo, Alessandro; Schuessler, Richard B.; Moon, Marc R.

2012-01-01

241

The association between dental health and procedures and developing shunt infections in pediatric patients.  

PubMed

Object Cerebrospinal fluid-diverting shunts are often complicated by bacterial infections. Dental procedures are known to cause transient bacteremia that could potentially spread hematogenously to these implanted devices. No literature currently exists to inform practitioners as to the need for prophylactic antibiotics for patients who possess these implants. The authors performed a retrospective study to assess whether dental procedures and poor oral health were associated with a higher likelihood of developing CSF-diverting shunt infections. Methods Neurosurgical and pediatric dental records from January 2007 to December 2012 were reviewed for shunt surgeries and dental encounters. Indications for shunt surgery and infection rates were recorded. Dental records were reviewed for several markers of overall dental health, such as a DMFT (decayed, missing, and filled teeth) score and a gingival health/oral hygiene score. The association between these scores and the incidence of shunt infections were studied. Moreover, the relationship between the incidence of shunt infections and the timing and invasiveness of preceding dental encounters were analyzed. Results A total of 100 pediatric patients were included in our study, for a total of 204 shunt surgeries. Twenty-one shunt infections were noted during the 6-year study period. Five of these shunts infections occurred within 3 months of a dental procedure. The odds ratio (OR) of developing a shunt infection within 3 months of a dental procedure was 0.98 (95% confidence interval [CI] 0.27-3.01), and was not statistically significant. The OR of developing a shunt infection after a high-risk dental procedure compared with a low-risk dental procedure was 1.32 (95% CI 0.02-16.29), and was not statistically significant. There was no significant association between measures of dental health, such as DMFT and gingival health score, and the likelihood of developing a shunt infection. The ORs for these 2 scores were 0.51 (95% CI 0.04-4.96) and 1.58 (95% CI 0.03-20.06), respectively. The study was limited by sample size. Conclusions Dental health status and the number and type of dental procedures performed do not appear to confer a higher risk of developing a CSF-diverting shunt infection in this pediatric population. PMID:25216290

Moazzam, Alan A; Nehrer, Ernest; Da Silva, Stephanie L; Polido, José C; Arakelyan, Anush; Habibian, Mina; Krieger, Mark D

2014-11-01

242

Ventriculovenous shunt to the proximal segment of a ligated neck vein. A new surgical technique for shunting the cerebrospinal fluid to the venous circulation (preliminary report).  

PubMed

The author proposes ventriculovenous shunts to a ligated neck vein (external jugular or facial) for the treatment of hydrocephalus. He postulates that the ligated neck vein is filled with CSF and becomes an extension of the shunt tube, which prevents venous thrombosis. The pressure of the shunt at the venous tube was shown to be about 90 mm H2O avoiding excessive ventricular decompression. Reflux of blood to the ventricle can occur if the infant's cranium is compressible and must be prevented by protecting the cranium from external pressure with a bandage or helmet or by incorporating a one-way valve into the shunt. 31 cases of advanced hydrocephalus were thus treated during a 4-year period. Ages ranged from 15 days to 55 years, the cranium was rigid in 13 and compressible in 18. A valve was used in only two cases. Shunts were patent 7-10 days after surgery, as shown at autopsies in two early postoperative deaths. In two cases meningitis occurred, one of them died. The shunt was removed in one case on account of meningitis and in 4 cases due to cervical CSF leakage. The former and three of the latter were reoperated with success. Three cases had distal shunt obstruction, two due to kinking of the tube, and one due to reflux of blood. One of the former died. 23 patients benefited from the operation, 5 of which were operated on twice. The follow-up period was from 0.5-44 months (average 11.5 months). The last two cases were operated on using one-way valve and a spiral wire in the venous segment of the tube. They are well 2 and 3 months, respectively, following surgery. PMID:1175444

El Shafei, I L

1975-01-01

243

Investigation of shunt resistor's connection for a DC Resistive SFCL  

NASA Astrophysics Data System (ADS)

A DC-operating resistive-type superconducting fault current limiter for AC applications (in short a DC Resistive SFCL) is based on the synergistic use of the "resistive" and the "rectifier" fault current limiter concepts, and allows the superconductor to operate in nearly DC current conditions. This regime of operation drastically reduces AC losses thus opening new perspectives with regard to materials, architecture of the cable, lay out of windings and cryogenics. In this paper the concept of DC resistive SFCL is resumed and a case study about its possible application in the distribution electrical system is reported. Two possible connections of external shunt resistor in order to reduce the Joule heating during the limiting phase are analysed.

Imparato, S.; Morandi, A.; Fabbri, M.; Negrini, F.; Ribani, P. L.

2010-06-01

244

Outcomes of transjugular intrahepatic portosystemic shunts for ascites.  

PubMed

Refractory ascites represents a devastating complication of portal hypertension. Transjugular intrahepatic portosystemic shunt (TIPS) is an efficacious option for patients for whom transplant is not an immediate option. Techniques to optimize the hepatic venous pressure gradient and the use of covered stents have reduced rates of hepatic encephalopathy and stent occlusion, respectively. Patients with a Model for End-Stage Liver Disease score less than 15, serum creatinine less than 2 mg/dL, and serum bilirubin less than 2 mg/dL are particularly suited for TIPS placement. TIPS is also effective for hepatic hydrothorax and for massive ascites in the posttransplant setting, although future investigations are necessary to elucidate risk factors and establish the effect on transplant-free survival. PMID:25177085

Bercu, Zachary L; Fischman, Aaron M

2014-09-01

245

Evaluation of magnetostrictive shunt damper performance using Iron (Fe)-Gallium (Ga) alloy  

NASA Astrophysics Data System (ADS)

This study presents the possibility of dissipating mechanical energy with a proof-of-concept prototype magnetostrictive based shunt circuit using passive electrical components. The device consists of a polycrystalline galfenol (Fe-Ga alloy) strip bonded to a brass cantilever beam. Two brass pieces, each containing a permanent magnet, are used to mass load each end of the beam and to provide a magnetic bias field through the galfenol strip. The voltage induced in an induction coil closely wound around the cantilever beam captures the time rate of change of magnetic flux within the galfenol strip as the beam vibrates. The first bending-mode resonant frequency of the device was 69.42 Hz. To dissipate the electrical voltage from the device, a shunt circuit is attached. The effective mechanical impedance for the magnetostrictive shunt circuit is derived. The shunted model is specialized for two shunt circuits: the case of a resistor and that of a capacitance. The experimental results for both the resistive and capacitance shunt circuits validate the shunted magnetostrictive damping model for couple of cased of resistance and capacitance.

Yoo, JinHyeong; Murray, Andrew; Flatau, Alison B.

2014-04-01

246

Staged Transcatheter Treatment of Portal Hypoplasia and Congenital Portosystemic Shunts in Children  

SciTech Connect

Purpose: Congenital portosystemic shunts (CPSS) with portal venous hypoplasia cause hyperammonemia. Acute shunt closure results in portal hypertension. A transcatheter method of staged shunt reduction to afford growth of portal vessels followed by shunt closure is reported. Methods: Pressure measurements and angiography in the CPSS or superior mesenteric artery (SMA) during temporary occlusion of the shunt were performed. If vessels were diminutive and the pressure was above 18 mmHg, a staged approach was performed, which included implantation of a tailored reducing stent to reduce shunt diameter by {approx}50 %. Recatheterization was performed approximately 3 months later. If the portal pressure was below 18 mmHg and vessels had developed, the shunt was closed with a device. Results: Six patients (5 boys, 1 girl) with a median age of 3.3 (range 0.5-13) years had CPSS portal venous hypoplasia and hyperammonemia. Five patients underwent staged closure. One patient tolerated acute closure. One patient required surgical shunt banding because a reducing stent could not be positioned. At median follow-up of 3.8 (range 2.2-8.4) years, a total of 21 procedures (20 transcatheter, 1 surgical) were performed. In all patients, the shunt was closed with a significant reduction in portal pressure (27.7 {+-} 11.3 to 10.8 {+-} 1.8 mmHg; p = 0.016), significant growth of the portal vessels (0.8 {+-} 0.5 to 4.0 {+-} 2.4 mm; p = 0.037), and normalization of ammonia levels (202.1 {+-} 53.6 to 65.7 {+-} 9.6 {mu}mol/L; p = 0.002) with no complications. Conclusion: Staged CPSS closure is effective in causing portal vessel growth and treating hyperammonemia.

Bruckheimer, Elchanan, E-mail: elchananb@bezeqint.net; Dagan, Tamir [Schneider Children's Medical Center Israel, Section of Pediatric Cardiology (Israel)] [Schneider Children's Medical Center Israel, Section of Pediatric Cardiology (Israel); Atar, Eli; Schwartz, Michael [Schneider Children's Medical Center Israel, Section of Radiology (Israel)] [Schneider Children's Medical Center Israel, Section of Radiology (Israel); Kachko, Ludmila [Schneider Children's Medical Center Israel, Section of Anesthesiology (Israel)] [Schneider Children's Medical Center Israel, Section of Anesthesiology (Israel); Superina, Riccardo; Amir, Gabriel [Schneider Children's Medical Center Israel, Section of Pediatric Cardiology (Israel)] [Schneider Children's Medical Center Israel, Section of Pediatric Cardiology (Israel); Shapiro, Rivka [Schneider Children's Medical Center Israel, Section of Gastroenterology (Israel)] [Schneider Children's Medical Center Israel, Section of Gastroenterology (Israel); Birk, Einat [Schneider Children's Medical Center Israel, Section of Pediatric Cardiology (Israel)] [Schneider Children's Medical Center Israel, Section of Pediatric Cardiology (Israel)

2013-12-15

247

Atrial shunts: presentation, investigation, and management, including recent advances in magnetic resonance imaging.  

PubMed

Atrial shunts are a common finding in both paediatric and adult populations. Recent developments in advanced imaging have widened the options for diagnosis and evaluation of such shunts. This paper reviews the various types of interatrial communications, discusses the features of clinical presentation in adults and children, and provides an overview of the clinical assessment including physical examination, electrocardiography, echocardiography, cardiac catheterisation, computed tomography, and magnetic resonance imaging. Focus will be placed on recent developments in magnetic resonance imaging that may improve the non-invasive evaluation of atrial shunts. PMID:24397877

Zvaigzne, Cheryl G; Howarth, Andrew G; Patton, David J

2014-06-01

248

Lactobacillus paracasei Lp6 favors immune modulation induced by allergoid treatment in ragweed sensitized mice.  

PubMed

It has been hypothesized that lactic acid bacteria (LAB) could be used as adjuvant for specific immunotherapy (SIT), as various studies conducted on humans and animals converge to define LAB as anti-Th2 modulators and Treg inducers. In the present study we evaluated the effects of LAB, in particular Lactobacillus paracasei Lp6 (Lp6), in a mouse model of ragweed (RW) allergy. Groups of Balb/c mice, experimentally sensitized towards ragweed, were treated by viable Lp6 or by RWallergoid with or without co-administration of Lp6. A control group was sham-sensitized with PBS and sham-treated with water and a group was sensitized with RW and treated with water. Serum IgE, RW-induced release of IFN-gamma, IL-4 and IL-10 from splenocytes and the frequency of CD4CD25 regulatory T cells (Tregs) expressing Foxp3 or IL-10 were evaluated in various groups. RW-allergoid treatment induced a reduction of serum IgE, with a decrease in RW-induced release of IL-4, and an increase in IL-10 and IFN-gamma, along with a significant change in the frequency of Tregs, both CD25+ and -. The joint RWallergoid+ Lp6 treatment induced the highest degree of suppression of allergen-driven IL-4, the greatest reduction of IL-4/IFN-gamma and IL-4/IL-10 ratios and the most significant increase of Foxp3 and IL-10 expressing Tregs. The study shows that Lp6 strengthens the immune modulation induced by allergoid-SIT in RW-sensitized mice, essentially characterized by a differential induction of Tregs associated to a reduction of IL-4; data converge to define a role of SIT adjuvant for Lp6. PMID:22230395

Petrarca, C; Lazzarin, F; Lanuti, P; Marchisio, M; Miscia, S; Rossi, C; Braga, M; Mistrello, G; Di Gioacchino, M

2011-01-01

249

Testing of cerebrospinal compensatory reserve in shunted and non-shunted patients: a guide to interpretation based on an observational study.  

PubMed Central

OBJECTIVE--To design a computerised infusion test to compensate for the disadvantages of Katzman's lumbar infusion method: inadequate accuracy of estimation of the resistance to cerebrospinal fluid outflow and poor predictive value in normal pressure hydrocephalus. METHODS--Accuracy was improved by intracranial pressure signal processing and model analysis for measurement of cerebrospinal compensatory variable. These include the CSF outflow resistance, brain compliance, pressure-volume index, estimated sagittal sinus pressure, CSF formation rate, and other variables. Infusion may be made into the lumbar space, ventricles, or, when assessing shunt function in vivo, the shunt chamber. RESULTS AND CONCLUSIONS--The computerised test has been used for five years in a multicentre study in 350 hydrocephalic patients of various ages, aetiologies, and states of cerebrospinal compensation. The principles of using the test to characterise different types of CSF circulatory disorders in patients presenting with ventricular dilatation, including brain atrophy and normal and high pressure hydrocephalus, are presented and illustrated. Previous studies showed a positive correlation between cerebrospinal compensatory variables and the results of shunting, but such a prediction remains difficult in idiopathic normal pressure hydrocephalus, particularly in elderly patients. The technique is helpful in the assessment of shunt malfunction, including posture-related overdrainage, over-drainage related to the nocturnal B wave activity, and proximal or distal shunt obstruction. The appendix presents an introduction of the mathematical modelling of CSF pressure volume-compensation included in computerised infusion test software. Images PMID:8778261

Czosnyka, M; Whitehouse, H; Smielewski, P; Simac, S; Pickard, J D

1996-01-01

250

Detailed analysis of amplitude and recurrence times of LP activity at Mt. Etna Volcano, Italy.  

NASA Astrophysics Data System (ADS)

Long-Period (LP) events recorded on many volcanoes worldwide are thought to be associated with conduit resonance triggered by fluid flow instabilities throughout the volcano plumbing system. The rate of Long-Period activity, however, varies greatly depending on the particular volcano taken into account. At Piton de la Fournaise, for instance, LP event rate is on the order of 10 events /year, while at Mt. Etna it is not unusual to observe several thousands of events per month. This work is aimed at improving our understanding of the LP source mechanism through a statistical analysis of detailed LP catalogues. The behaviour of LP activity is compared with the empirical laws governing earthquakes recurrence (e.g., Gutenberg-Richter [GR] and Omori's laws), in order to understand what relationships, if any, exist between these two apparently different earthquake classes. In particular, we investigated the amplitude and the recurrence time of LP activity on Mt. Etna, Italy, using data from a temporary network (inter-station distance ~5km ) and a small-aperture array (inter-station distance ~50m) deployed in 2005. Some 13,000 LP events were detected in August 2005 through a short-term average/long-term average (STA/LTA) method. Directional properties of these events were obtained by applying a Plane Wave Fitting (PWF) method to data from the small array. The different directions of propagation measured for such events suggest that at least two different sources are active. From PWF alone we were not able to isolate the contribution of individual sources without ambiguity. LP signals, however, exhibit a high degree of waveform similarity, thus providing a criterion for classification / source separation. Using correlation analysis, we then grouped the events into families containing comparable waveforms. By waveforms stacking, we obtained a representative, template event for each family. These template signals were then used for a Matched-Filtering of the continuous data streams, in order to discriminate small-amplitude events previously undetected by the STA/LTA triggering method. This procedure allowed for a significant enrichment of the catalogues, from which we retrieved amplitudes and inter-event times associated with individual families. The retrieved amplitude distributions differ significantly from the GR law, and there is no clear relationship between events amplitude and recurrence times. Comparison with data from both lab experiments and numerical simulations of (i) brittle-fracturing of high-viscosity materials, and (ii) fluid flow under different regimes, are needed in order to better understand the physics governing the observed distributions. Hopefully, these steps will lead to an improved understanding of LP activity, in turn clarifying their significance in terms of eruption forecasting.

Cauchie, L.; Saccorotti, G.; Bean, C.; de Barros, L.

2012-04-01

251

Pulse-envelope-driven dynamics at Floquet anticrossings of He Rydberg atoms: CP vs. LP  

NASA Astrophysics Data System (ADS)

A fast beam of n^3S He Rydberg atoms prepared with CO2 laser-double-resonance excitation flew through a TE_121 mode cavity, exposing the atoms to about 300 oscillations of a 9.904 GHz electric field (peak amplitude F) with a half-sine pulse envelope. Although the field polarization could be set to any ellipticity, the work presented here focuses on the circular (CP) and linear (LP) cases. Detection of a surviving Rydberg atom signal \\cal S(F) occurred downstream in a voltage-labeled 9.8 GHz cavity whose field amplitude was set empirically to ionize (n,M_l=0) atoms more efficiently than (n,|M_l|>= 1) atoms( W. van de Water et al.), Phys. Rev. A 42, 572 (1990). . The ions were detected with a particle multiplier. For both n=28,29 we found that several sharp dips present in \\cal S(F) for LP were transformed for CP into patterns reminiscent of Stueckelberg oscillations (as observed previously with LP at higher frequencies)( S. Yoakum et al.), Phys. Rev. Lett. 69, 1919 (1992). . Calculations of Floquet quasienergy levels detail how avoided crossings in CP fields differ from those in LP fields. \\cal S(F) for CP and LP will be compared with a model based upon computed Floquet quasienergy levels.

Zelazny, S. A.; Koch, P. M.

1997-04-01

252

Serum Lp AI lipoprotein particles and other antiatherogenic lipid parameters in normolipidaemic obese subjects.  

PubMed

The android pattern of body fat distribution has been shown to increase the risk of metabolic and coronary heart disease. Protective lipid markers against cardiovascular disease were studied in 98 obese normolipidaemic, non diabetic, non-smoker subjects over 18 years of age according to regional distribution of adipose tissue as estimated by the waist ship ratio (WHR) and overall obesity as estimated by the body mass index (BMI). WHR was inversely correlated with Lp AI (r = 0.46) and HDL-cholesterol (r = 0.37). BMI was not correlated with protective lipid parameters but only with triglycerides. After adjustment, Lp AI was lower in men and in upper body obese women (p < 0.05). Lp AI is a better indicator of body fat distribution than HDL-cholesterol or apo AI, and its variations appear to be indirectly related to gender, menopause, and age, thereby influencing body fat distribution (the main factor accounting for Lp AI variation). Lp AI was inversely correlated with WHR in gluteal-femoral obese women but not in abdominally obese women or men, possibly because of a threshold effect. PMID:8896995

Lecerf, J M; Masson, A; Fruchart, J C; Bard, J M

1996-10-01

253

Destruction of LP XM46 using the molten salt destruction process. Revision 1  

SciTech Connect

The preliminary experimental work done on the destruction of the liquid gun propellant LP XM46 (the new designation for LGP-1846) using the Molten Salt Destruction (MSD) Process at the Lawrence Livermore National Laboratory (LLNL) for the US Army is described in this report. A series of 18 continuous experimental runs were made wherein a solution of LP XM46 and water was injected into a bed of molten salt comprising the carbonates of sodium, potassium and lithium, along with air. The purpose of these initial Phase 1 runs was to collect information on the applicability of the Molten Salt Destruction Process for the destruction of LP XM46, identify the key technical uncertainties, and to plan future runs. The tentative results from these experiments, described in detail in the main body of this report, indicate that: (1) LP XM46 can be safely and completely destroyed in a bed of molten salt at temperatures well below those needed for incineration; and (2) under optimum operating conditions, less than 1% of the chemically bound nitrogen in the LP XM46 is converted to NOx, and less than 1% carbon is converted to CO.

Upadhye, R.S.; Watkins, B.E.

1994-04-01

254

Analysis of error floor of LDPC codes under LP decoding over the BSC  

SciTech Connect

We consider linear programming (LP) decoding of a fixed low-density parity-check (LDPC) code over the binary symmetric channel (BSC). The LP decoder fails when it outputs a pseudo-codeword which is not a codeword. We propose an efficient algorithm termed the instanton search algorithm (ISA) which, given a random input, generates a set of flips called the BSC-instanton and prove that: (a) the LP decoder fails for any set of flips with support vector including an instanton; (b) for any input, the algorithm outputs an instanton in the number of steps upper-bounded by twice the number of flips in the input. We obtain the number of unique instantons of different sizes by running the ISA sufficient number of times. We then use the instanton statistics to predict the performance of the LP decoding over the BSC in the error floor region. We also propose an efficient semi-analytical method to predict the performance of LP decoding over a large range of transition probabilities of the BSC.

Chertkov, Michael [Los Alamos National Laboratory; Chilappagari, Shashi [UNIV OF AZ; Vasic, Bane [UNIV OF AZ; Stepanov, Mikhail [UNIV OF AZ

2009-01-01

255

Design and test of a novel isolator with negative resistance electromagnetic shunt damping  

NASA Astrophysics Data System (ADS)

This paper proposes a negative resistance electromagnetic shunt damping vibration isolator and investigates the effectiveness of the isolator. The isolator consists of a shunt circuit and a pair of electromagnet and permanent magnets that are pasted onto a box-shaped spring. A kind of negative resistance shunt impedance is proposed to cancel the inherent resistance of the electromagnet. The electromechanical coupling coefficient and the electromagnetic damping force calculation formula are obtained by Biot-Savart’s law and Ampère’s law, respectively. A single degree of freedom system is employed to verify the performance of the proposed isolator. The governing equation is established. The performance of the proposed isolator under a half-cycle sine pulse is investigated and discussed. Experiments were carried out and the results agreed well with the numerical predictions. Both the results demonstrate that the negative resistance electromagnetic shunt damping vibration isolator could suppress vibration transmitted to the structure effectively.

Yan, Bo; Zhang, Xinong; Niu, Hongpan

2012-03-01

256

Renal-splenic shunt for infrahepatic caval occlusion after piggy-back liver transplantation  

Microsoft Academic Search

Inferior vena cava thrombosis after liver transplantation is uncommon. We describe a case of this unusual complication occurring\\u000a after piggy-back (end-to-side) graft implantation. Renal failure, lower limb edema, and hemodynamic instability were the presenting\\u000a symptoms requiring immediate surgical correction with a left renal-to-splenic vein shunt over a ringed 2.5-cm prosthesis.\\u000a The decision to go ahead with the shunt was preceded

Vincenzo Mazzaferro; Enrico Regalia; Andrea Pulvirenti; Dario Baratti; Giuseppe Montagnino; Federico Bozzetti

1997-01-01

257

What are the implications of the spontaneous spleno-renal shunts in liver cirrhosis?  

Microsoft Academic Search

BACKGROUND: Although significant advances are expected to be made in the assessment of the portal hypertension-related complications, the prognostic role of spleno-renal shunts has not been fully explored so far. Clarifying this aspect could help tackle the life-treating events occurring in patients suffering from liver cirrhosis. The aim of the study was to analyze the relationships between the spleno-renal shunts

Giovanni Tarantino; Vincenzo Citro; Paolo Conca; Antonio Riccio; Marianna Tarantino; Domenico Capone; Michele Cirillo; Roberto Lobello; Vittorio Iaccarino

2009-01-01

258

Penile Gangrene with Abscess Formation after Modified Al-Ghorab Shunt for Idiopathic Ischemic Priapism  

PubMed Central

Penile gangrene is a rare but unfortunate complication of surgical intervention and priapism shunts. The literature regarding penile gangrene following surgical correction of priapism is sparse, the majority of which dates back to thirty to forty years. Here, we present the case of a 60-year-old man who presented with priapism that required operative management with a modified Al-Ghorab shunt and eventually suffered from complete necrosis of the penis with abscess formation in both corpora cavernosa.

Ford-Glanton, Beneranda S.; Siddiqui, Sameer

2014-01-01

259

The Role of Bacterial Biofilms in Infections of Catheters and Shunts  

Microsoft Academic Search

\\u000a Catheters and shunts are tubes which are used to manage the flow of fluids into, within, and out of the body. Intravascular\\u000a catheters deliver fluids and medications directly into the bloodstream, while urinary catheters drain waste fluids. In some\\u000a cases devices such as cerebral ventricular shunts drain fluid from the brain, to another part of the body, such as the

Trine Rolighed Thomsen; Luanne Hall-Stoodley; Claus Moser; Paul Stoodley

260

Experimental Percutaneous Extrahepatic Portacaval Shunt Creation by Transjugular Approach in Swine  

SciTech Connect

The purpose of the study was to evaluate the feasibility of the creation of a percutaneous extrahepatic portacaval shunt (PEPS) in swine by a transjugular approach and to find a suitable stent-graft to use in PEPS. In 12 swine, the extrahepatic portal vein (PV) was entered from the inferior vena cava (IVC) by a needle system introduced from the transjugular approach. A catheter introduced through the transhepatic approach served as a target. Five types of stent-graft consisting of homemade Z stents and a polytetrafluoethylene cover were explored for PEPS creation. Eight animals had follow-up venograms up to 6 weeks or until the shunt became severely stenotic. Gross and histologic examinations were performed after the final follow-up venography. The PV punctures and stent-graft placement were difficult, but the PEPS was established in all animals. In four animals, the stent-graft failed to adequately cover the tract, causing severe hemorrhage. Only two shunts remained patent up to 6 weeks. The other shunts exhibited severe stenosis or occlusion. At gross examination, all shunts traversed the liver parenchyma of the caudate lobe surrounding the IVC. The extravascular PEPS portion was 4 mm to 2 cm long. All shunts entered the PV close to the splenomesenteric junction and exhibited neointimal formation. Shunt stenoses were caused by neointimal hyperplasia and occlusions by a superimposed thrombus. PEPS can be created by the transjugular approach in swine, but only the PV shunt entrance is extrahepatic. None of the tested rigid stent-grafts were suitable for PEPS creation. A short flexible stent-graft with flanged ends is suggested for further exploration.

Seong, Chang Kyu; Pavcnik, Dusan, E-mail: pavcnikd@ohsu.edu; Uchida, Barry T.; Anai, Hiroshi; Timmermans, Hans; Niyyati, Mahtab [Oregon Health and Science University, L342, Dotter Interventional Institute (United States); Corless, Christopher L. [Oregon Health and Science University, L342, Department of Pathology (United States); Correa, Luiz O.; Keller, Frederick S.; Roesch, Josef [Oregon Health and Science University, L342, Dotter Interventional Institute (United States)

2005-06-15

261

Deletion of Rbpj from postnatal endothelium leads to abnormal arteriovenous shunting in mice.  

PubMed

Arteriovenous malformations (AVMs) are tortuous vessels characterized by arteriovenous (AV) shunts, which displace capillaries and shunt blood directly from artery to vein. Notch signaling regulates embryonic AV specification by promoting arterial, as opposed to venous, endothelial cell (EC) fate. To understand the essential role of endothelial Notch signaling in postnatal AV organization, we used inducible Cre-loxP recombination to delete Rbpj, a mediator of canonical Notch signaling, from postnatal ECs in mice. Deletion of endothelial Rbpj from birth resulted in features of AVMs by P14, including abnormal AV shunting and tortuous vessels in the brain, intestine and heart. We further analyzed brain AVMs, as they pose particular health risks. Consistent with AVM pathology, we found cerebral hemorrhage, hypoxia and necrosis, and neurological deficits. AV shunts originated from capillaries (and possibly venules), with the earliest detectable morphological abnormalities in AV connections by P8. Prior to AV shunt formation, alterations in EC gene expression were detected, including decreased Efnb2 and increased Pai1, which encodes a downstream effector of TGF? signaling. After AV shunts had formed, whole-mount immunostaining showed decreased Efnb2 and increased Ephb4 expression within AV shunts, suggesting that ECs were reprogrammed from arterial to venous identity. Deletion of Rbpj from adult ECs led to tortuosities in gastrointestinal, uterine and skin vascular beds, but had mild effects in the brain. Our results demonstrate a temporal requirement for Rbpj in postnatal ECs to maintain proper artery, capillary and vein organization and to prevent abnormal AV shunting and AVM pathogenesis. PMID:25209249

Nielsen, Corinne M; Cuervo, Henar; Ding, Vivianne W; Kong, Yupeng; Huang, Eric J; Wang, Rong A

2014-10-01

262

Rheolytic Thrombectomy of an Acutely Thrombosed Transjugular Intrahepatic Portosystemic Stent Shunt  

SciTech Connect

As an alternative to chemical thrombolysis, an acutely occluded transjugular intrahepatic portosystemic stent shunt in a 72-year-old woman was successfully recanalized using a 5 Fr rheolytic catheter system. No adjunctive thrombectomy treatment was necessary. The underlying stenotic leason was treated with percutaneous transluminal angioplasty and a Palmaz stent. Immediately after the intervention optimal shunt flow was achieved. Ascites vanished within a few days and no further bleeding complications appeared.

Mueller-Huelsbeck, Stefan; Link, Johann [Department of Radiology, University Hospital, Arnold-Heller-Strasse 9, D-24105 Kiel (Germany); Hoepfner, Michael; Loeser, Christian [Department of Internal Medicine, University Hospital, Schittenhelmstrasse, D-24105 Kiel (Germany); Heller, Martin [Department of Radiology, University Hospital, Arnold-Heller-Strasse 9, D-24105 Kiel (Germany)

1996-04-15

263

Relation between Shunt, Aeration, and Perfusion in Experimental Acute Lung Injury  

Microsoft Academic Search

lavage. The lung field was divided in six horizontal regions. Measurements and Main Results: Each animal showed an inverse rela- tionbetweenregionalshunt(FS)andgas(FG)fractions:FS 52 mFG 1 FS0. This relation was similar among animals (m 5 1.25 6 0.14, FS0 5 0.75 60.15)andinvariantwithend-expiratorypressure,despitelack of correlation between global shunt and gas fractions and large interanimal variability in global shunt fraction. When this relation was

Guido Musch; Giacomo Bellani; Marcos F. Vidal Melo; R. Scott Harris; Tilo Winkler; Tobias Schroeder; Jose G. Venegas

2007-01-01

264

Acute Budd-Chiari syndrome: Treatment with transjugular intrahepatic portosystemic shunt  

SciTech Connect

The case of a 28-year-old man with acute Budd-Chiari syndrome due to veno-occlusive disease is reported. Transjugular intrahepatic portosystemic shunt (TIPS) was performed after upper gastrointestinal endoscopy, duplex sonographic and abdominal computed tomographic examination, inferior cavogram with hepatic venous catheterization, and transvenous biopsy. A 10-mm parenchymal tract was created. The patient did well after the procedure; ascites resolved and liver function improved markedly. The shunt has remained patent up to now for 6 months.

Strunk, Holger M.; Textor, Jochen [University of Bonn, Department of Radiology (Germany); Brensing, Karl-August [University of Bonn, Department of Internal Medicine (Germany); Schild, Hans H. [University of Bonn, Department of Radiology (Germany)

1997-07-15

265

The collateral caval shunt as an alternative to classical shunt procedures in patients with recurrent duodenal varices and extrahepatic portal vein thrombosis.  

PubMed

Upper gastrointestinal bleeding episodes from variceal structures are severe complications in patients with portal hypertension. Endoscopic sclerotherapy and variceal ligation are the treatment options preferred for upper variceal bleeding owing to extrahepatic portal hypertension due to portal vein thrombosis (PVT). Recurrent duodenal variceal bleeding in non-cirrhotic patients with diffuse porto-splenic vein thrombosis and subsequent portal cavernous transformation represent a clinical challenge if classic shunt surgery is not possible or suitable.In this study, we represent a case of recurrent bleeding of duodenal varices in a non-cirrhotic patient with cavernous transformation of the portal vein that was successfully treated with a collateral caval shunt operation. PMID:24965047

Hau, Hans Michael; Fellmer, Peter; Schoenberg, Markus B; Schmelzle, Moritz; Morgul, Mehmet Haluk; Krenzien, Felix; Wiltberger, Georg; Hoffmeister, Albrecht; Jonas, Sven

2014-01-01

266

The collateral caval shunt as an alternative to classical shunt procedures in patients with recurrent duodenal varices and extrahepatic portal vein thrombosis  

PubMed Central

Upper gastrointestinal bleeding episodes from variceal structures are severe complications in patients with portal hypertension. Endoscopic sclerotherapy and variceal ligation are the treatment options preferred for upper variceal bleeding owing to extrahepatic portal hypertension due to portal vein thrombosis (PVT). Recurrent duodenal variceal bleeding in non-cirrhotic patients with diffuse porto-splenic vein thrombosis and subsequent portal cavernous transformation represent a clinical challenge if classic shunt surgery is not possible or suitable. In this study, we represent a case of recurrent bleeding of duodenal varices in a non-cirrhotic patient with cavernous transformation of the portal vein that was successfully treated with a collateral caval shunt operation. PMID:24965047

2014-01-01

267

Transvenous retrograde portography for identification and characterization of portosystemic shunts in dogs.  

PubMed

Transvenous retrograde portography for identification and characterization of portosystemic shunts in dogs A method for transvenous retrograde portography (TRP) in dogs suspected to have a portosystemic shunt (PSS) and results in 20 dogs are described. For TRP, dogs were anesthetized and positioned in left lateral recumbency A dual-lumen balloon-tipped catheter was inserted into the right jugular vein and advanced into the azygos vein. The balloon was inflated to occlude the azygos vein, and contrast material was injected during fluoroscopic evaluation. The catheter was then positioned in the caudal vena cava just cranial to the diaphragm. The balloon was again inflated to occlude the vena cava, and contrast material was again injected. Once a shunt was identified, selective catheterization was attempted with a guide wire and angled catheter. A PSS was identified in 18 of the 20 dogs. In 10 of the 18, the shunt vessel could be selectively catheterized, allowing measurement of portal pressures while the shunt was occluded with the balloon. In 1 dog, results of TRP were normal, but subsequent exploratory celiotomy revealed a single extrahepatic PSS, which was surgically attenuated. The other dog in which results of TRP were normal did not have a macroscopic PSS. In dogs suspected to have a PSS, TRP may be a useful adjunctive diagnostic test that is less invasive than operative mesenteric vein portography and allows measurement of portal pressures before and after temporary shunt occlusion. PMID:12479329

Miller, Matthew W; Fossum, Theresa W; Bahr, Anne M

2002-12-01

268

Is sternotomy superior to thoracotomy for modified Blalock-Taussig shunt?  

PubMed

A best evidence topic in cardiac surgery was written according to a structured protocol. The question addressed was: is sternotomy approach superior to a thoracotomy approach for a modified Blalock-Taussig shunt procedure? More than 58 papers were found using the search as described below, of which 11 papers represented the best evidence to answer the clinical question. The authors, journal, date and country of publication, patient group studied, study type, relevant outcomes and results of these papers are tabulated. Three of seven papers compared the sternotomy and thoracotomy approaches. The operative approach was a significant predictor of shunt failure. The criterion used to define early shunt failure was either the complete occlusion during hospitalization or the need to return to the operating room for a second shunt. The studies that compared the thoracotomy and sternotomy approaches observed increased shunt failure rates in the thoracotomy group. The sternotomy approach was associated with advantages like less pulmonary artery distortion, ease of technical performance, cosmetic advantage of a single sternotomy incision, ease of ligation of patent ductus, less phrenic nerve injury, less collateral formation in chest wall adhesions and less thoracotomy induced scoliosis. However, other papers studied either the sternotomy approach only or the thoracotomy approach and drew conclusions regarding risk factors for operative morbidity and mortality. We conclude that the sternotomy approach is beneficial to neonates and infants undergoing modified Blalock-Taussig shunt when compared with the conventional thoracotomy approach. PMID:24336782

Talwar, Sachin; Kumar, Manikala Vinod; Muthukkumaran, Subramanian; Airan, Balram

2014-03-01

269

Adaptive ventilator FiO2 advisor: use of non-invasive estimations of shunt.  

PubMed

A non-invasive and simple method of parameter estimation has been developed for the model-based decision support of the artificial ventilation in intensive care units. The parameter concerned was the respiratory shunt. Originally, the shunt had to be estimated using a numerical algorithm, which was slow and unreliable. The estimation process also required the knowledge of other parameters, whose values could only be obtained using invasive monitoring equipment. In this paper, the respiratory index is used for the shunt estimation. A linear regression model and a non-linear adaptive neuro-fuzzy inference system (ANFIS) model were used to describe the relationship between the respiratory index and the shunt. The shunts estimated using these models were then used to calculate the fractional inspired oxygen needed to attain the target arterial oxygen level of the model patient. The advisor also utilises population median values of the cardiac index and oxygen consumption index. This alleviates the need for invasive monitoring. In a simulation study, the mean squared error of the control using the ANFIS model was 0.75 kPa2 compared to 2.06 kPa2 using the linear regression model. Therefore, the performance of the FiO2 advisor was better when the shunt was estimated using the non-linear ANFIS model. PMID:15531148

Kwok, H F; Linkens, D A; Mahfouf, M; Mills, G H

2004-11-01

270

Action of Linezolid or Vancomycin on Biofilms in Ventriculoperitoneal Shunts In Vitro  

PubMed Central

Cerebrospinal fluid (CSF) shunts used to treat hydrocephalus have an overall infection rate of about 10% of operations. The commonest causative bacteria are Staphylococcus epidermidis, followed by Staphylococcus aureus and enterococci. Major difficulties are encountered with nonsurgical treatment due to biofilm development in the shunt tubing and inability to achieve sufficiently high CSF drug levels by intravenous administration. Recently, three cases of S. epidermidis CSF shunt infection have been treated by intravenous linezolid without surgical shunt removal, and we therefore investigated vancomycin and linezolid against biofilms of these bacteria in vitro. A continuous-perfusion model of shunt catheter biofilms was used to establish mature (1-week) biofilms of Staphylococcus aureus, Staphylococcus epidermidis (both methicillin resistant [MRSA and MRSE]), Enterococcus faecalis, and Enterococcus faecium. They were then “treated” with either vancomycin or linezolid in concentrations achievable in CSF for 14 days. The biofilms were then monitored for 1 week for eradication and for regrowth. Enterococcal biofilms were not eradicated by either vancomycin or linezolid. Staphylococcal biofilms were eradicated by both antibiotics after 2 days and did not regrow. No resistance was seen. Linezolid at concentrations achievable by intravenous or oral administration was able to eradicate biofilms of both S. epidermidis (MRSE) and S. aureus (MRSA). Neither vancomycin at concentrations achievable by intrathecal administration nor linezolid was able to eradicate enterococcal biofilms. It is hoped that these in vitro results will stimulate further clinical trials with linezolid, avoiding surgical shunt removal. PMID:22430965

Ullas, Gautham; Ashraf, Waheed

2012-01-01

271

Effect of rapamycin on hepatic osteodystrophy in rats with portasystemic shunting  

PubMed Central

AIM: To study if T-cell activation related to portasystemic shunting causes osteoclast-mediated bone loss through RANKL-dependent pathways. We also investigated if T-cell inhibition using rapamycin would protect against bone loss in rats. METHODS: Portasystemic shunting was performed in male Sprague-Dawley rats and rapamycin 0.1 mg/kg was administered for 15 wk by gavage. Rats received powderized chow and supplemental feeds to prevent the effects of malnutrition on bone composition. Weight gain and growth was restored after surgery in shunted animals. At termination, biochemical parameters of bone turnover and quantitative bone histology were assessed. Markers of T-cell activation, inflammatory cytokine production, and RANKL-dependent pathways were measured. In addition, the roles of IGF-1 and hypogonadism were investigated. RESULTS: Portasystemic shunting caused low turnover osteoporosis that was RANKL independent. Bone resorbing cytokine levels, including IL-1, IL-6 and TNF?, were not increased in serum and TNF? and RANKL expression were not upregulated in PBMC. Portasystemic shunting increased the circulating CD8+ T-cell population. Rapamycin decreased the circulating CD8+ T-cell population, increased CD8+ CD25+ T-regulatory cell population and improved all parameters of bone turnover. CONCLUSION: Osteoporosis caused by portasystemic shunting may be partially ameliorated by rapamycin in the rat model of hepatic osteodystrophy. PMID:16874862

van der Merwe, Schalk W; Conradie, Maria M; Bond, Robert; Olivier, Brenda J; Fritz, Elongo; Nieuwoudt, Martin; Delport, Rhena; Slavik, Tomas; Engelbrecht, Gert; Kahn, Del; Shephard, Enid G; Kotze, Maritha J; de Villiers, Nico P; Hough, Stephen

2006-01-01

272

z=0 z=0 z=0 Steam-turbin Condenser LP-pump  

E-print Network

¡ ¢£ ¤ ¥§¦ ¨ © ¥£ ¡ £ ¨ © ¦ ¦ ¡ £ ¨ © ¦ ¦ ¥ ¦ © © ¡ ¥ ¥ £ ¦ ¡ ! ¦ " ©# £ $ ¤ #12; 4 ¡ 3 @ ¢ 2 6 3 F 4 9 7 LC LC PC z=0 z=0 z=0 z=1 z=1 TC TC z=0 HP-pump Steam-turbin Condenser LP-pump Air compressor Deaerator HP-pump Steam-turbin Condenser LP-pump Air compressor Deaerator HP ¤ HP-pump Gas-turbin Steam-turbin Condenser LP-pump Air compressor Deaerator HP-pump Gas-turbin Steam

Skogestad, Sigurd

273

Effects of topography and crustal heterogeneities on the source estimation of LP event at Kilauea volcano  

USGS Publications Warehouse

The main goal of this study is to improve the modelling of the source mechanism associated with the generation of long period (LP) signals in volcanic areas. Our intent is to evaluate the effects that detailed structural features of the volcanic models play in the generation of LP signal and the consequent retrieval of LP source characteristics. In particular, effects associated with the presence of topography and crustal heterogeneities are here studied in detail. We focus our study on a LP event observed at Kilauea volcano, Hawaii, in 2001 May. A detailed analysis of this event and its source modelling is accompanied by a set of synthetic tests, which aim to evaluate the effects of topography and the presence of low velocity shallow layers in the source region. The forward problem of Green's function generation is solved numerically following a pseudo-spectral approach, assuming different 3-D models. The inversion is done in the frequency domain and the resulting source mechanism is represented by the sum of two time-dependent terms: a full moment tensor and a single force. Synthetic tests show how characteristic velocity structures, associated with shallow sources, may be partially responsible for the generation of the observed long-lasting ringing waveforms. When applying the inversion technique to Kilauea LP data set, inversions carried out for different crustal models led to very similar source geometries, indicating a subhorizontal cracks. On the other hand, the source time function and its duration are significantly different for different models. These results support the indication of a strong influence of crustal layering on the generation of the LP signal, while the assumption of homogeneous velocity model may bring to misleading results. ?? 2008 The Authors Journal compilation ?? 2008 RAS.

Cesca, S.; Battaglia, J.; Dahm, T.; Tessmer, E.; Heimann, S.; Okubo, P.

2008-01-01

274

Scaling of electromagnetic transducers for shunt damping and energy harvesting  

NASA Astrophysics Data System (ADS)

In order for an electromagnetic transducer to operate well as either a mechanical shunt damper or as a vibration energy harvester, it must have good electromechanical coupling. A simple two-port analysis is used to derive a non-dimensional measure of electromechanical coupling, which must be large compared with unity for efficient operation in both of these applications. The two-port parameters for an inertial electromagnetic transducer are derived, from which this non-dimensional coupling parameter can be evaluated. The largest value that this parameter takes is approximately equal to the square of the magnetic flux density times the length of wire in the field, divided by the mechanical damping times the electrical resistance. This parameter is found to be only of the order of one for voice coil devices that weigh approximately 1 kg, and so such devices are generally not efficient, within the definition used here, in either of these applications. The non-dimensional coupling parameter is found to scale in approximate proportion to the device's characteristic length, however, and so although miniaturised devices are less efficient, greater efficiency can be obtained with large devices, such as those used to control civil engineering structures.

Elliott, Stephen J.; Zilletti, Michele

2014-04-01

275

Cerebral fat embolism without intracardiac shunt: A novel presentation  

PubMed Central

Fat embolism syndrome (FES) is defined as an uncommon life-threatening disease process consisting of pulmonary, central nervous system (CNS), and cutaneous manifestations. The pathophysiology of this secondary injury is poorly understood. In the setting of the multiply injured patient, the diagnosis of FES is difficult to ascertain. A case report of a posttraumatic death caused by acute dissemination of diffuse fat emboli to the brain and lungs in the absence of a right-to-left heart defect after femur fracture is presented. The transesophageal echo cardiogram with bubble study failed to demonstrate an intracardiac defect or AV malformation in the lung further supporting a biochemical process. The acute decompensation of the patient within 2 h of the injury would favor mechanical emboli. Supportive care continues to be the mainstay of treatment for FES. Cerebral fat embolism should be considered in traumatically injured patients with unexplained decline in their neurologic examination. Cerebral fat embolism may occur without an intracardiac shunt. PMID:21769222

Eriksson, Evert A; Schultz, Sarah E; Cohle, Stephen D; Post, Kenneth W

2011-01-01

276

Integrated fuel cell stack shunt current prevention arrangement  

DOEpatents

A fuel cell stack includes a plurality of fuel cells juxtaposed with one another in the stack and each including a pair of plate-shaped anode and cathode electrodes that face one another, and a quantity of liquid electrolyte present at least between the electrodes. A separator plate is interposed between each two successive electrodes of adjacent ones of the fuel cells and is unified therewith into an integral separator plate. Each integral separator plate is provided with a circumferentially complete barrier that prevents flow of shunt currents onto and on an outer peripheral surface of the separator plate. This barrier consists of electrolyte-nonwettable barrier members that are accommodated, prior to the formation of the integral separator plate, in corresponding edge recesses situated at the interfaces between the electrodes and the separator plate proper. Each barrier member extends over the entire length of the associated marginal portion and is flush with the outer periphery of the integral separator plate. This barrier also prevents cell-to-cell migration of any electrolyte that may be present at the outer periphery of the integral separator plate while the latter is incorporated in the fuel cell stack.

Roche, Robert P. (Cheshire, CT); Nowak, Michael P. (Bolton, CT)

1992-01-01

277

MRI and MRA of spinal cord arteriovenous shunts.  

PubMed

The purpose of this review is to describe the diagnostic criteria for spinal cord arteriovenous shunts (SCAVSs) when using magnetic resonance imaging (MRI) and magnetic resonance angiography (MRA), and to discuss the extent to which the different MRI and MRA sequences and technical parameters provide the information that is required to diagnose these lesions properly. SCAVSs are divided into four groups according to location (paraspinal, epidural, dural, or intradural) and type (fistula or nidus); each type of lesion is described. SCAVSs are responsible for neurological symptoms due to spinal cord or nerve root involvement. MRI is usually the first examination performed when a spinal cord lesion is suspected. Recognition of the image characteristics of vascular lesions is mandatory if useful sequences are to be performed-especially MRA sequences. Because the treatment of SCAVSs relies mainly on endovascular therapies, MRI and MRA help with the planning of the angiographic procedure. We explain the choice of MRA sequences and parameters, the advantages and pitfalls to be aware of in order to obtain the best visualization, and the analysis of each lesion.J. Magn. Reson. Imaging 2014;40:1253-1266. © 2014 Wiley Periodicals, Inc. PMID:24591106

Condette-Auliac, Stéphanie; Boulin, Anne; Roccatagliata, Luca; Coskun, Oguzhan; Guieu, Stéphanie; Guedin, Pierre; Rodesch, Georges

2014-12-01

278

Exercise-induced intrapulmonary arteriovenous shunt in healthy women.  

PubMed

The purpose of this study was to determine if healthy young women of various aerobic fitness levels are vulnerable to intrapulmonary arteriovenous shunts (IPAVS) at sub maximal work rates. Female volunteers (n=24) performed semi-recumbent cycling exercise to exhaustion and agitated saline contrast echocardiography was used to determine the presence of IPAVS at rest, during exercise, and post exercise. Subjects were classified as untrained (UT, n=8), moderately trained (MT, n=6) and highly trained (HT, n=10) based on their respective (V(O(2,peak)) (UT=35±5; MT=43±1 and HT = 50 ± 3 ml kg(-1) min(-1)). We found that the % (V(O(2,peak)) at IPAVS onset was not significantly different between women of varying fitness (P>0.05). The majority of individuals exhibited IPAVS during modest levels of exercise intensity. In conclusion, there is no association between aerobic capacity or exercise intensity at IPAVS onset in women performing semi-recumbent cycle exercise. PMID:22285797

Kennedy, Jill M; Foster, Glen E; Koehle, Michael S; Potts, James E; Sandor, George G S; Potts, M Terri; Houghton, Kristin M; Henderson, William R; Sheel, A William

2012-04-15

279

Hyperglucagonemia and hyperkinetic circulation after portocaval shunt in the rat  

SciTech Connect

The study was aimed at investigating whether increased portal venous inflow (PVI) after portocaval shunt (PCS) in the rat is the result of selective splanchnic vasodilatation or whether it is part of a generalized circulatory disturbance. Rats with PCS and sham-operated controls were studied 2 wk after surgery by measuring cardiac output (CO), PVI, and hepatic artery flow (HAF) with radioactive microspheres (V Cr and UC). Plasma glucagon (GL) was measured by radioimmunoassay. PCS rats had increased CO and reduced arterial pressure and total peripheral resistance. PVI was markedly increased, but this appeared to be part of a generalized circulatory disturbance, since when PVI is expressed as percent of CO no difference is observed between PCS and sham-operated rats, indicating the absence of a preferential splanchnic vasodilatation. GL increased after PCS, and significant correlations were observed between GL and CO and between GL and PVI. HAF increased after PCS but did not compensate the loss of portal flow, evidence by a lower total hepatic flow in PCS rats. These results suggest that PCS induces a hyperkinetic circulatory state in which increased PVI represents its splanchnic manifestation and that increased GL release may be in part responsible for these hemodynamic changes.

Kravetz, D.; Arderiu, M.; Bosch, J.; Fuster, J.; Visa, J.; Casamitjana, R.; Rodes, J.

1987-02-01

280

Amides of xanthurenic acid as zinc-dependent inhibitors of Lp-PLA(2).  

PubMed

AX10185, the phenyl amide of xanthurenic acid, was found to be a sub-100nM inhibitor of Lp-PLA(2). However, in the presence of EDTA the inhibitory activity of AX10185 was extinguished while the enzymatic activity of Lp-PLA(2) did not change. Subsequent metal screening experiments determined the inhibition to be Zn(2+) dependent. Structure-activity relationship studies indicated the presence of the 4-hydroxy group to be critical and selected substituted phenyl, polycyclic, and cycloaliphatic amides of xanthurenic acid to be well tolerated. PMID:22217870

Lin, Emme C K; Hu, Yi; Amantea, Christopher M; Pham, Lan M; Cajica, Julia; Okerberg, Eric; Brown, Heidi E; Fraser, Allister; Du, Lingling; Kohno, Yasushi; Ishiyama, Junichi; Kozarich, John W; Shreder, Kevin R

2012-01-15

281

Evaluating the implementation of HeLP-Diabetes within NHS services: study protocol  

PubMed Central

Background Self-management by people with type 2 diabetes is central to good health outcomes and the prevention of associated complications. Structured education to teach self-management is recommended by the National Institute for Heath and Clinical Excellence; however, only a small proportion of patients report being offered this education and even fewer attend. This study aims to evaluate the implementation of a new internet-based self-management intervention: HeLP-Diabetes (Healthy Living for People with type 2 Diabetes) within the National Health Service. Specific objectives are to a) determine the uptake and use of HeLP-Diabetes by services and patients; b) identify the factors which inhibit or facilitate use; c) identify the resources needed for effective implementation; d) explore possible effects of HeLP-Diabetes use on self-reported patient outcome measures. Methods/Design This study will use an iterative design to implement HeLP-Diabetes into existing health services within the National Health Service. A two stage implementation process will be taken, whereby batches of General Practice surgeries and diabetes clinics will be offered HeLP-Diabetes and will subsequently be asked to participate in evaluating the implementation. We will collect data to describe the number of services and patients who sign up to HeLP-Diabetes, the types of services and patients who sign up and the implementation costs. Semi-structured interviews will be conducted with patients and health professionals and cohorts of patient participants will be asked to complete self-report measures at baseline, 3 months, and 12 months. Discussion This study will evaluate the implementation of a new online self-management intervention and describe what happens when it is made available to existing National Health Services and patients with type 2 diabetes. We will collect data to describe the uptake and use of the intervention and the resources needed for widespread implementation. We will report on patient benefits from using HeLP-Diabetes and the resources needed to achieve these in routine practice. Interviews with key stake holders will identify, define and explain factors that promote or inhibit the normalization of new patterns of patient and professional activity arising from HeLP-Diabetes. PMID:24495515

2014-01-01

282

N. Logic, E. Kyriakides, G. T. Heydt, "Lp State Estimators for Power Systems," N. Logic, E. Kyriakides, G. T. Heydt, "Lp state estimators for power systems," Journal of Electric Power  

E-print Network

1 N. Logic, E. Kyriakides, G. T. Heydt, "Lp State Estimators for Power Systems," N. Logic, E. Kyriakides, G. T. Heydt, "Lp state estimators for power systems," Journal of Electric Power Components. Kyriakides G. T. Heydt Arizona State University PO Box 875706 Tempe, Arizona 85287 USA The widely used method

283

Lp(a) lipoprotein levels as a predictor of risk for thrombogenic events in patients with Beh?et's disease.  

PubMed Central

OBJECTIVES--To investigate whether plasma levels of Lp(a) lipoprotein (Lp(a)) are predictors of defective fibrinolytic activity, leading to thrombosis, in patients with Behçet's disease. METHODS--Plasma Lp(a) was measured by enzyme linked immunosorbent assay, lipids and lipoproteins by enzymatic methods, and apolipoproteins A-I and B, fibrinogen (turbidimetric method), tissue plasminogen activator (t-PA), plasminogen activator inhibitor-1 (PAI-1), and D-dimer levels by enzyme immunoassay. Their levels and interactions were evaluated in 33 patients with Behçet's disease (including five with thrombotic complications) and 30 healthy control subjects. RESULTS--Plasma Lp(a) concentration was significantly greater in the patients than in controls. Nine patients (27%) had levels > 0.30 microgram. There was no correlation between Lp(a) and other lipids and lipoproteins apart from apolipoprotein B. Lp(a) showed inverse correlation with t-PA (r = -0.34, p < 0.05) and D-dimer (r = 0.35, p < 0.05). Patients with thrombotic complications had significantly greater Lp(a) and PAI-1, and lower D-dimer concentrations than control subjects. CONCLUSIONS--Measurement of plasma Lp(a) levels in patients with Behçet's disease may provide useful information regarding the potential development of thrombotic events, because of its possible role in defective fibrinolysis. PMID:7495343

Orem, A; Deger, O; Memis, O; Bahadir, S; Ovali, E; Cimsit, G

1995-01-01

284

Eur. J. Biochem. 161,37-43 (1986) A 'H-NMR study of human interleukin-lp  

E-print Network

vectors in E. coli, large amounts of highly purified recombinant 11-1 are potentially available-lp for our studies, since it can be produced as a soluble protein in large quantities in E. coli and purifiedEur. J. Biochem. 161,37-43 (1986) 0FEBS 1986 A 'H-NMR study of human interleukin-lp Sequence

Clore, G. Marius

285

78 FR 10128 - Expansion/Reorganization of Foreign-Trade Subzone 70T; Marathon Petroleum Company LP; Detroit, MI  

Federal Register 2010, 2011, 2012, 2013

...Expansion/Reorganization of Foreign-Trade Subzone 70T; Marathon Petroleum Company LP; Detroit, MI Pursuant to its authority...Site 1 of Subzone 70T and remove Site 3 of the subzone at the Marathon Petroleum Company LP refinery in Detroit, Michigan....

2013-02-13

286

75 FR 56093 - Eagle Rock Desoto Pipeline, LP; Notice of Motion for Extension of Rate Case Filing Deadline  

Federal Register 2010, 2011, 2012, 2013

...Commission [Docket No. PR09-1-002] Eagle Rock Desoto Pipeline, LP; Notice of Motion for Extension...Take notice that on September 8, 2010, Eagle Rock Desoto Pipeline, L.P. (Eagle Rock) filed a request to extend the date for...

2010-09-15

287

A factor-graph-based random walk, and its relevance for LP decoding analysis and Bethe entropy characterization  

Microsoft Academic Search

Although min-sum algorithm (MSA) and linear programming (LP) decoding are tightly related, it is not straightforward to translate MSA decoding performance analysis techniques to the LP decoding setup. Towards closing this performance analysis techniques gap, Koetter and Vontobel [ITAW 2006] showed how the collection of messages from several MSA decoding iterations can be used to construct a dual witness for

Pascal O. Vontobel

2010-01-01

288

75 FR 54661 - Main Street Mezzanine Fund, LP; Notice of Exemption Under Section 312 of the Small Business...  

Federal Register 2010, 2011, 2012, 2013

...Mezzanine Fund, LP provided a debt/equity financing to National Trench Safety, LLC, 15955 West Hardy Road, Houston, TX 77060...Mezzanine Fund, LP, owns more than ten percent of National Trench Safety, LLC. Notice is hereby given that any interested...

2010-09-08

289

75 FR 54661 - Main Street Capital II, LP; Notice of Exemption Under Section 312 of the Small Business...  

Federal Register 2010, 2011, 2012, 2013

...Capital II, LP provided a debt/equity financing to National Trench Safety, LLC, 15955 West Hardy Road, Houston, TX 77060...Street Capital II, LP, owns more than ten percent of National Trench Safety, LLC. Notice is hereby given that any interested...

2010-09-08

290

Cerebrospinal fluid shunt dynamics in patients with idiopathic adult hydrocephalus syndrome.  

PubMed Central

The objective was to assess CSF dynamics of different shunt constructions in patients with adult hydrocephalus syndrome and correlate these findings to clinical outcome, neuroradiology, and the specifications of the shunts provided by the manufacturer. Thirty four patients with idiopathic adult hydrocephalus (normal pressure hydrocephalus) syndrome were included in a prospective, consecutive case series. A differential pressure valve (Cordis Hakim standard system) was used in 28 patients and a variable resistance valve (Cordis Orbis-Sigma) in six. A constant pressure infusion method was used; CSF pressure and conductance were determined before surgery. Three months after shunt placement CSF pressure, the "pressure v flow" curve, and gravity induced flow were measured. There was no difference between mean preoperative and postoperative resting CSF pressures in patients with Hakim shunts. The opening pressures of the Hakim shunts were higher than the value proposed by the manufacturer. A pronounced gravity effect induced CSF flow and decrease of the CSF pressure. In functioning variable resistance valves, CSF dynamics normalised postoperatively. There was no gravity effect and the characteristics shaped "pressure v flow" curve was sometimes seen. Six patients (three differential pressure valves, three variable resistance valves) had non-functioning shunts. Four of these patients were improved after the operation but improvement was transient in three. In all patients, there was no relation between the width of the ventricles and clinical improvement or CSF pressure. In conclusion, the differential pressure valve system does not behave according to the specifications provided by the manufacturer. A decrease in CSF pressure in patients with this shunt was solely due to the effect of gravity. Eleven percent of the differential pressure valves and 50% of the variable resistance valves were non-functioning. In the functioning variable resistance valves, the antisiphon system seems to be effective. Images PMID:7608674

Malm, J; Kristensen, B; Fagerlund, M; Koskinen, L O; Ekstedt, J

1995-01-01

291

Effect of Prone Position on Regional Shunt, Aeration, and Perfusion in Experimental Acute Lung Injury  

PubMed Central

Rationale: The prone position is used to improve gas exchange in patients with acute respiratory distress syndrome. However, the regional mechanism by which the prone position improves gas exchange in acutely injured lungs is still incompletely defined. Methods: We used positron emission tomography imaging of [13N]nitrogen to assess the regional distribution of pulmonary shunt, aeration, perfusion, and ventilation in seven surfactant-depleted sheep in supine and prone positions. Results: In the supine position, the dorsal lung regions had a high shunt fraction, high perfusion, and poor aeration. The prone position was associated with an increase in lung gas content and with a more uniform distribution of aeration, as the increase in aeration in dorsal lung regions was not offset by loss of aeration in ventral regions. Consequently, the shunt fraction decreased in dorsal regions in the prone position without a concomitant impairment of gas exchange in ventral regions, thus leading to a significant increase in the fraction of pulmonary perfusion participating in gas exchange. In addition, the vertical distribution of specific alveolar ventilation became more uniform in the prone position. A biphasic relation between regional shunt fraction and gas fraction showed low shunt for values of gas fraction higher than a threshold, and a steep linear increase in shunt for lower values of gas fraction. Conclusion: In a surfactant-deficient model of lung injury, the prone position improved gas exchange by restoring aeration and decreasing shunt while preserving perfusion in dorsal lung regions, and by making the distribution of ventilation more uniform. PMID:15901611

Richter, Torsten; Bellani, Giacomo; Harris, R. Scott; Melo, Marcos F. Vidal; Winkler, Tilo; Venegas, Jose G.; Musch, Guido

2005-01-01

292

A minimally invasive temporary cavernoso-saphenous shunt in the management of priapism after failed conservative treatment.  

PubMed

Priapism is an urological emergency with detrimental consequences, if not managed expeditiously. Though a rare condition with an incidence between 0.3 and 1.5 per 100,000 population, its management options are limited and decision making could be challenging. We present a case of late presenting priapism for which the initial routine clinical care (aspiration, intracavernosal injection, and distal shunt) failed to relieve erection. Subsequently, the patient was successfully treated by a temporary cavernoso-saphenous shunt using carotid shunt and repeated heparin flushes. This novel surgical treatment offers an alternate method of relieving priapism, avoiding the long-term undesired effects associated with permanent proximal shunts such as cavernoso-venous grafts. Moreover, interval flushes (and/or repeated aspirations) with heparin ensures patency of this new shunt during the perioperative period. The patient recovered without any complications and the shunt was removed after one week. He has regained partial erection, however refused to have further treatment. Temporary cavernoso-saphenous shunt using carotid shunt offers an alternate option of management of priapism in patients with failed initial conservative treatment and distal shunts. PMID:22142185

Mains, Edward; Aboumarzouk, Omar; Ahmad, Sarfraz; El-Mokadem, Ismail; Nabi, Ghulam

2012-09-01

293

65 nm LP/GP mix low cost platform for multi-media wireless and consumer applications  

NASA Astrophysics Data System (ADS)

A complete 65 nm CMOS platform, called LP/GP Mix, has been developed employing thick oxide transistor (IO), Low Power (LP) and General Purpose (GP) devices on the same chip. Dedicated to wireless multi-media and consumer applications, this new triple gate oxide platform is low cost (+1mask only) and saves over 35% of dynamic power with the use of the low operating voltage GP. The LP/GP mix shows competitive digital performance with a ring oscillator (FO = 1) speed equal to 7 ps per stage (GP) and 6T-SRAM static power lower than 10 pA/cell (LP). Compatible with mixed-signal design requirements, transistors show high voltage gain, low mismatch factor and low flicker noise. Moreover, to address mobile phone demands, excellent RF performance has been achieved with FT = 160 GHz for LP and 280 GHz for GP nMOS transistors.

Tavel, B.; Duriez, B.; Gwoziecki, R.; Basso, M. T.; Julien, C.; Ortolland, C.; Laplanche, Y.; Fox, R.; Sabouret, E.; Detcheverry, C.; Boeuf, F.; Morin, P.; Barge, D.; Bidaud, M.; Biénacel, J.; Garnier, P.; Cooper, K.; Chapon, J. D.; Trouiller, Y.; Belledent, J.; Broekaart, M.; Gouraud, P.; Denais, M.; Huard, V.; Rochereau, K.; Difrenza, R.; Planes, N.; Marin, M.; Boret, S.; Gloria, D.; Vanbergue, S.; Abramowitz, P.; Vishnubhotla, L.; Reber, D.; Stolk, P.; Woo, M.; Arnaud, F.

2006-04-01

294

Tuning response range of a transmission-based fiber-optic refractometer through LP?? mode.  

PubMed

A kind of sensing scheme is theoretically proposed to efficiently tune the response range of a fiber-optic refractometer based on the adiabatic transmission of the higher-order LP11 mode. Near the cut-off condition, transmission of the LP11 mode is a strong function of the refractive index (RI) under detection; thus high sensitivity is achieved. The cut-off RI value is dependent on the waist diameter; therefore the response RI range with high sensitivity can be changed just by altering the waist diameter. Theoretical calculations reveal that the response range is effectively tuned from 1.43-1.438 to 1.35-1.365 when the waist diameter is reduced from 2.5 to 1 ?m. The proposed fiber-optic sensor is also superior when used as an absorbing sensor since the higher-order mode LP11 has a much larger power fraction in the evanescent field compared with the fundamental mode LP01 of the same fiber. PMID:24686649

Liu, Guigen; Li, Kaiwei; Dai, Fang; Hao, Peng; Zhou, Wenchao; Wu, Yihui; Xuan, Ming

2014-04-01

295

76 FR 45246 - Tesoro Refining and Marketing Company v. SFPP, L.P.; Notice of Complaint  

Federal Register 2010, 2011, 2012, 2013

...Regulatory Commission [Docket No. OR11-19-000] Tesoro Refining and Marketing Company v. SFPP, L.P.; Notice of Complaint...section 1803 of the Energy Policy Act of 1992 (EPAct), Tesoro Refining and Marketing Company (Tesoro) filed a formal complaint...

2011-07-28

296

76 FR 45247 - Tesoro Refining and Marketing Company v. SFPP, L.P.; Notice of Complaint  

Federal Register 2010, 2011, 2012, 2013

...Regulatory Commission [Docket No. OR 11-18-000] Tesoro Refining and Marketing Company v. SFPP, L.P.; Notice of Complaint...and section 1803 of the Energy Policy Act of 1992. Tesoro Refining and Marketing Company (Complainant) filed a formal...

2011-07-28

297

76 FR 49468 - Tesoro Refining and Marketing Company, SFPP, L.P.; Notice of Complaint  

Federal Register 2010, 2011, 2012, 2013

...Regulatory Commission [Docket No. OR11-20-000] Tesoro Refining and Marketing Company, SFPP, L.P.; Notice of Complaint...section 1803 of the Energy Policy Act of 1992 (EPAct), Tesoro Refining and Marketing Company (Complainant) filed a complaint...

2011-08-10

298

3 Duality and sensitivity 3.1 Dual of standard LP's  

E-print Network

pills for food in the diet if the pills are no more expensive than the corresponding food. His problem. Note that to make the dimensions fit in the dual LP the yi must be some sort of prices. Dual of diet problem A manufacturer of nutrient pills considers that the dietician will be prepared to sub- stitute

299

76 FR 50488 - Accreditation and Approval of Saybolt, LP., as a Commercial Gauger and Laboratory  

Federal Register 2010, 2011, 2012, 2013

...Saybolt, LP, Road 127 KM 13.4 Bo. Magas Arriba, P.R., has been approved to gauge and test petroleum and petroleum products for customs purposes, in accordance with the provisions of 19 CFR 151.12 and 19 CFR 151.13. Anyone...

2011-08-15

300

A Trajectory Method for the Optimization of the Multi-Facility Location Problem With lp Distances  

Microsoft Academic Search

We consider the multi-facility location problem of placing m new facilities optimally among n demand points (or existing facilities) so that the sum of all weighted lp distance pairs (facility to facility and facility to demand point) is minimized. A method involving the solution of differential equations by numerical integration is presented. This method is computationally comparable to many existing

Z. Drezner; G. O. Wesolowsky

1978-01-01

301

LP3 volume 2 MARCH 2013 The bulletin of research, teaching and development activity  

E-print Network

in the classroom are only just starting to become available for the teaching of Modern Languages. The posterLP3 volume 2 MARCH 2013 The bulletin of research, teaching and development activity From The Sussex to introduce Intercultural Competence in the classroom. Silvia Taylor and Viviana Coston - University of Sussex

Sussex, University of

302

Efficient algorithm for optimal force distribution-the compact-dual LP method  

Microsoft Academic Search

An efficient algorithm, the compact-dual linear programming (LP) method, is presented to solve the force distribution problem. In this method, the general solution of the linear equality constraints is obtained by transforming the underspecified matrix into row-reduced echelon form; then, the linear equality constraints of the force distribution problem are eliminated. In addition, the duality theory of linear programming is

F.-T. Cheng; D. E. Orin

1990-01-01

303

Explosive Solutions of Stochastic Reaction-Diffusion Equations in Mean Lp  

E-print Network

Explosive Solutions of Stochastic Reaction-Diffusion Equations in Mean Lp -Norm Pao-Liu Chow, Parabolic It^o equations, It^o's Formula, Positive Solutions, Blow-up of solutions, Explosions. 1 #12 this phenomenon is manifested as the explosion in combustion, reaction diffusion and branching diffusion problems

304

76 FR 1996 - Airworthiness Directives; M7 Aerospace LP (Type Certificate Previously Held by Fairchild Aircraft...  

Federal Register 2010, 2011, 2012, 2013

...Aerospace LP (Type Certificate Previously Held by Fairchild Aircraft Incorporated) Models SA26-AT, SA26-T, SA226-AT, SA226-T, SA226-T(B), SA226-TC, SA227-AC (C-26A), SA227-AT, SA227-BC (C-26A), SA227-CC,...

2011-01-12

305

The Apo(a) gene is the major determinant of variation in plasma Lp(a) levels in African Americans.  

PubMed Central

The distributions of plasma lipoprotein(a), or Lp(a), levels differ significantly among ethnic groups. Individuals of African descent have a two- to threefold higher mean plasma level of Lp(a) than either Caucasians or Orientals. In Caucasians, variation in the plasma Lp(a) levels has been shown to be largely determined by sequence differences at the apo(a) locus, but little is known about either the genetic architecture of plasma Lp(a) levels in Africans or why they have higher levels of plasma Lp(a). In this paper we analyze the plasma Lp(a) levels of 257 sibling pairs from 49 independent African American families. The plasma Lp(a) levels were much more similar in the sibling pairs who inherited both apo(a) alleles identical by descent (IBD) (r = .85) than in those that shared one (r = .48) or no (r = .22) parental apo(a) alleles in common. On the basis of these findings, it was estimated that 78% of the variation in plasma Lp(a) levels in African Americans is attributable to polymorphism at either the apo(a) locus or sequences closely linked to it. Thus, the apo(a) locus is the major determinant of variation in plasma Lp(a) levels in African Americans, as well as in Caucasians. No molecular evidence was found for a common "high-expressing" apo(a) allele in the African Americans. We propose that the higher plasma levels of Lp(a) in Africans are likely due to a yet-to-be-identified trans-acting factor(s) that causes an increase in the rate of secretion of apo(a) or a decrease in its catabolism. PMID:9311746

Mooser, V; Scheer, D; Marcovina, S M; Wang, J; Guerra, R; Cohen, J; Hobbs, H H

1997-01-01

306

Amplitude and Recurrence Time of LP activity at Mt. Etna, Italy  

NASA Astrophysics Data System (ADS)

The manifestation of Long-Period (LP) activity is attested on many volcanoes worldwide and is thought to be associated with the resonant oscillations of subsurface, fluid-filled, cracks and conduits. Nonetheless the actual source mechanism that originates the resonance is still unclear. Different models have been proposed so far, including (i) fluid flow instabilities as periodic degassing and (ii) brittle failure in viscous magmas. Since LP activity usually precedes and accompanies volcanic eruption, the understanding of these sources is crucial for the hazard assessment and eruption early warning. The work is aimed at improving the understanding of the LP source mechanism through a statistical analysis of detailed LP catalogues. The behaviour of LP activity is compared with the empirical laws governing earthquakes recurrence (e.g., Gutenberg-Richter [GR] and Gamma-law distributions), in order to understand what relationships, if any, exist between these two apparently different earthquake classes. In particular, about 13000 events were detected on Mount Etna in August 2005 through a STA/LTA method. For this given period, the volcano does not present particular sign of unrest. The manifestation of the LP events is sustained in time over all the period of analysis. From the analysis of the directional properties, it turns out that the events of this first catalog propagate from 2 distinct sources . Furthermore, the events exhibit a high degree of waveform similarity, and provide a criterion for classification/source separation. The events were then grouped into families of comparable waveforms, resulting also in a separation for their source locations. We then used template signals of each family for a Matched-Filtering of the continuous data streams, in order to discriminate small-amplitude events previously undetected by the STA/LTA triggering method. This procedure allowed for a significant enrichment of the catalogues. The retrieved amplitude distributions, similar for both families, differ instead significantly from the Gutenberg-Richter law, and the inter-event times distributions don't follow a typical Gamma-law. In order to compare these results with a catalogue for which the source mechanism is well-established, we applied the same analysis procedure to a dataset from Stromboli Volcano, where LP activity is closely related to VLP (Very-Long-Period) pulses, in turn associated with the summit explosions. Again, catalogues of thousands of LP events were achieved over one month of seismic records (July 2011). Our results indicate a similar behaviour in terms of both amplitude and inter-event time distributions, with respect to what observed at Mt. Etna. This suggests that the Etna's LP data are likely related with a degassing process occurring at depth. Nonetheless, further studies are needed in order to quantify the time recurrence and amplitude distribution of brittle failure in viscous, stressed magmas. Hopefully, these steps will lead to an improved understanding of LP activity in different volcanic contexts, in turn clarifying its significance in terms of eruption forecasting.

Cauchie, Léna; Saccorotti, Gilberto; Bean, Christopher

2013-04-01

307

Pre- and post-shunting observations in adult sheep with kaolin-induced hydrocephalus  

PubMed Central

Background The objective of this study was to examine host-shunt interactions in sheep with kaolin-induced hydrocephalus. Methods Forty-two sheep (29–40 kg) were utilized for this study. In 20 animals, various kaolin doses were injected into the cisterna magna including 10 and 50 mg/kg as well as 2–4 ml of a 25% kaolin suspension. Based on animal health and hydrocephalus development, 3 ml of a 25% kaolin suspension was chosen. In 16 animals, kaolin was administered and 6–8 days later, the animals received a custom made ventriculo-peritoneal shunt. In 8 animals ventricular CSF pressures were measured with a water manometer before kaolin administration and 7–8 days later. The sheep were allowed to survive for up to 9–12 weeks post-kaolin or until clinical status required euthanasia. Brains were assessed for morphological and histological changes. Ventricle/cerebrum cross sectional area ratios (V/C) were calculated from photographs of the sliced coronal planes immediately anterior to the interventricular foramina. Results Intraventricular pressures increased from 12.4±1.1 cm H2O to 41.3±3.5 cm H2O following kaolin injection (p?0.10) ventricular expansion. The animals lost weight between kaolin administration and shunting (33.7±1.2 kg versus 31.0±1.7 kg) with weights after shunting remaining stable up to sacrifice (31.6±2.2 kg). Of 16 shunted animals, 5 did well and were sacrificed 9–12 weeks post-kaolin. In the remainder, the study was terminated at various times due to deteriorating health. Hydrocephalus was associated with thinning of the corpus callosum, but no obvious loss of myelin staining, along with reactive astroglial (glial fibrillary acidic immunoreactive) and microglial (Iba1 immunoreactive) changes in the white matter. Ventricular shunts revealed choroid plexus ingrowth in 5/16, brain tissue ingrowth in 1/16, problems with shunt insertion in 3/16, occlusion by hemorrhagic-inflammatory material in 5/16, or no obstruction in 2/16. Free flowing CSF indicated that the peritoneal catheter was patent. Conclusions Cerebrospinal fluid shunts in hydrocephalic sheep fail in ways that are reminiscent of human neurosurgical experience suggesting that this model may be helpful in the development of more effective shunt technology. PMID:23845003

2013-01-01

308

Barry shunt for treatment of a 76-hour stuttering priapism without subsequent erectile dysfunction  

PubMed Central

Introduction This paper reports treatment of a 76-hour low-flow priapism with a shunting procedure that was first described by Barry in 1976. We were able to observe the preservation of erectile function despite the long period of ischemia. A review of the literature shows that there are few reports of erectile function recovery after a priapism of similar duration. Materials and methods A 42-year-old patient presented with a 76-hour priapism, probably caused by consumption of alcohol and illegal drugs. A Barry Shunt procedure was performed. The erectile function of the patient was assessed by means of International Index of Erectile Function score over a follow-up period of 30 months. Moreover, we reviewed different surgical options for treatment of priapism in the literature. Results Partial return of erection without sexual arousal occurred on two occasions during the 10-day hospitalization, but was treated by manipulation of the penis, ie, by milking the tumescence into the shunt. After 3 months, the shunt was still palpable as a subcutaneous swelling. Six months postoperatively, the residual swelling had disappeared. The International Index of Erectile Function score was of 21 without phosphodiesterase type 5 inhibitors after a follow-up of 2.5 years. Conclusion Barry shunt is an effective alternative surgical option for the treatment of low-flow priapism. In the case of our patient, it was also effective after a 76-hour-lasting priapism. PMID:25157340

Osmonov, Daniar Kurmanbekovich; Aksenov, Aleksey; Guerra Sandoval, Andrea Nathaly; Kalz, Almut; Juenemann, Klaus Peter

2014-01-01

309

Noninvasive cerebrospinal fluid shunt flow measurement by Doppler ultrasound using ultrasonically excited bubbles: a feasibility study.  

PubMed

Because normal cerebrospinal fluid (CSF) has almost no natural Doppler scatterers, patency testing of ventriculoperitoneal cerebrospinal fluid shunts (small silastic tubing with lumen diameter of approximately 1 mm draining excessive CSF from the brain) cannot be performed by Doppler ultrasound. We have developed a low-frequency bubble excitation system that generates microbubble scatterers in both distilled water and CSF. Doppler ultrasound can then be used for flow measurement in a ventriculoperitoneal shunt. By using low duty-cycle (approximately 10%), low-frequency (approximately 30 kHz), and low-amplitude (approximately 30 kPa) ultrasound, a population of microbubbles can be maintained for sufficiently long times (>10 min) for Doppler ultrasound measurement, although bubble initiation is inconsistent. The minimum pressure needed for bubble maintenance was found to decrease with increasing burst length and duty cycle. It has been possible to detect the presence of CSF shunt flow down to a mean flow rate of 3 mL/h (mean velocity approximately 0.6 mm/s). The bubble maintenance scheme developed satisfies the safety parameters specified by the American Institute of Ultrasound in Medicine (AIUM) and the US Food and Drug Administration (FDA). Results from both in vitro and in vivo (externalized shunts) experiments indicate the feasibility of this scheme for determining realistic CSF shunt flows, though some practical problems remain before the technique will be ready for clinical use. PMID:10374981

Lam, K W; Drake, J M; Cobbold, R S

1999-03-01

310

Efficacy of Doppler Ultrasonography for Assessment of Transjugular Intrahepatic Portosystemic Shunt Patency  

SciTech Connect

Purpose: To assess the efficacy of Doppler ultrasonography (US) as a noninvasive method for monitoring patency of the transjugular intrahepatic portosystemic shunt (TIPS). Methods: Twenty-nine patients who had received TIPS for bleeding esophagogastric varices and/or refractory ascites with portal hypertension underwent Doppler US studies within 2 weeks after TIPS. Further studies were performed in 15 of them at 6 months, in 9 at 1 year, and in 4 at 2 years for a total of 57 US studies. The US findings were compared with the angiographic findings obtained at the same time. Results: In 45 of the 57 studies, shunt patency was found by Doppler US, correlating to 44 patencies and one occlusion on angiography. Doppler signal in the shunt could not be detected in 12 studies resulting in the diagnosis of shunt occlusion. This correlated with angiographic occlusion in 8 studies and patency in the remaining 4. All angiographically patent shunts that were occluded by Doppler US had various degrees of stenosis. A number of technical factors were found to be responsible for Doppler US false-positive or false-negative diagnoses, some related to the type of stent used. The Doppler US sensitivity was therefore 92%, the specificity 89%. Conclusion: Doppler US is a reliable noninvasive method to evaluate patency of TIPS.

Kimura, Masashi; Sato, Morio; Kawai, Nobuyuki; Tanaka, Kayo; Sonomura, Tetsuo; Shioyama, Kazushi; Kishi, Yasukazu; Terada, Masaki; Yamada, Ryusaku [Department of Radiology, Wakayama Medical College, 27 Banchi, 7 Bancho, Wakayama City, 640 (Japan)

1996-11-15

311

Contrast-enhanced magnetic resonance angiography for diagnosis of portosystemic shunts in 10 dogs.  

PubMed

Computed tomography angiography, sonography, scintigraphy, and portography can be used to evaluate the portal vasculature to evaluate for a portosystemic shunt (PSS). Time-of-flight magnetic resonance angiography (TOF-MRA) and contrast-enhanced MRA (CE-MRA) are other potentially useful techniques. The aim of this study was to evaluate CE-MRA in 10 dogs suspected of having a PSS. Noncontrast MR images of the abdomen were obtained using a Siemens Symphony MR-scanner (1.5 T) and a T1-weighted FLASH-3D sequence with a very short scan time (about 20 s). After injection of contrast medium, the initial sequence was repeated five times. The sequence with the best contrast medium filling of the portal vasculature was selected subjectively, subtracted from the initial survey image series, and a maximum intensity projection (MIP) of the subtraction data, in multiple views, was created. The cross-sectional and MIP images were evaluated for abnormal portosystemic vasculature. A single PSS was identified and confirmed at surgery in all dogs. A portocaval shunt was found in five dogs, a portophrenic shunt in three dogs, a portoazygos shunt in one, and a central divisional intrahepatic shunt in one other dog. Based on our results, CE-MRA is a useful tool for imaging abdominal and portal vasculature and for the diagnosis of a PSS. PMID:20402393

Bruehschwein, Andreas; Foltin, Isa; Flatz, Katharina; Zoellner, Martin; Matis, Ulrike

2010-01-01

312

[Residual shunt after percutaneous occlusion of patent ductus arteriosus by Rashkind's device. Echographic aspects, outcome, prognostic factors and management].  

PubMed

Percutaneous occlusion of patent ductus arteriosus with the double umbrella Rashkind prosthesis is an alternative to surgery. The authors report the results of a series of 40 patients aged 16 to 203 months, who underwent transcatheter occlusion of patent ductus arteriosus between January 1989 and March 1993. These children were followed up regularly, clinically and by echocardiography to determine the presence or absence of a residual shunt. Immediately after implantation, angiography showed a residual shunt in 75% of cases. However, the shunt progressively regressed during follow-up. Three types of shunt were described using colour Doppler based on the diameter of the transductal jet at its origin and its extension in the pulmonary artery: type I, a wide jet (> 3 mm), type II, or minimal shunt, with a jet diameter of 2 to 3 mm and an extension to the pulmonary valve (flame-like), and finally the type III, or punctiform shunt with a jet diameter < 2 mm and extension in the main pulmonary artery < 1.5 cm. During follow-up, a transition between the 3 types was observed in 37% of cases. Kaplan-Meier actuarial analysis showed a residual shunt rate of 33% at one year and 19% at 2 years after implantation. The search for predictive factors of residual shunt showed that very young patients at the time of catheterisation was the only indicator of a residual shunt (p = 0.03). Occlusion of a patent ductus arteriosus with a Rashkind device is a reliable method which gives good results. The essential problem remains that of a residual shunt but this disappears in 3/4 of patients during follow-up. When the shunt persists, a 1 to 2 year interval is advised before considering implantation of a second occluder. PMID:7857177

Godart, F; Rey, C; Jarrar, M; Francart, C; Vaksmann, G; Brevière, G M

1994-05-01

313

76 FR 17180 - C3 Capital Partners II, L.P.; Notice Seeking Exemption Under 312 of the Small Business Investment...  

Federal Register 2010, 2011, 2012, 2013

...Regulations because C3 Capital Partners, L.P., an Associate of C3 Capital Partners II, L.P., currently owns greater...considered an Associate of C3 Capital Partners II, L.P. as defined in Sec...45 am] BILLING CODE...

2011-03-28

314

78 FR 32294 - Escalate Capital Partners SBIC I, L.P., License No. 06/06-0335; Notice Seeking Exemption Under...  

Federal Register 2010, 2011, 2012, 2013

...BUSINESS ADMINISTRATION Escalate Capital Partners SBIC I, L.P., License No. 06...is hereby given that Escalate Capital Partners SBIC I, L.P., 300 W. 6th Street...13 CFR 107.730). Escalate Capital Partners SBIC I, L.P. proposes to make a...

2013-05-29

315

78 FR 32294 - Escalate Capital Partners SBIC I, L.P., License No. 06/06-0335; Notice Seeking Exemption Under...  

Federal Register 2010, 2011, 2012, 2013

...BUSINESS ADMINISTRATION Escalate Capital Partners SBIC I, L.P., License No. 06...is hereby given that Escalate Capital Partners, SBIC I, L.P., 300 W. 6th Street...13 CFR 107.730). Escalate Capital Partners, SBIC I, L.P. proposes to...

2013-05-29

316

75 FR 71785 - Escalate Capital Partners SBIC I, L.P., License No. 06/06-0335; Notice Seeking Exemption Under...  

Federal Register 2010, 2011, 2012, 2013

...BUSINESS ADMINISTRATION Escalate Capital Partners SBIC I, L.P., License No. 06...is hereby given that Escalate Capital Partners, SBIC I, L.P., 300 W. 6th Street...13 CFR 107.730). Escalate Capital Partners, SBIC I, L.P. proposes to...

2010-11-24

317

77 FR 42353 - Ascent Venture Partners IV-A, L.P., License No. 01/01-0404; Notice Seeking Exemption Under...  

Federal Register 2010, 2011, 2012, 2013

...BUSINESS ADMINISTRATION Ascent Venture Partners IV-A, L.P., License No. 01...Notice is hereby given that Ascent Venture Partners IV-A, L.P., 255 State Street...13 CFR 107.730). Ascent Venture Partners IV-A, L.P. proposes to sell a...

2012-07-18

318

77 FR 74544 - Eagle Fund III, L.P., License No. 07/07-0116; Notice Seeking Exemption Under Section 312 of the...  

Federal Register 2010, 2011, 2012, 2013

...SMALL BUSINESS ADMINISTRATION Eagle Fund III, L.P., License No. 07...of Interest Notice is hereby given that Eagle Fund III, L.P., 101 S. Hanley Road...Rules and Regulations (13 CFR part 107). Eagle Fund III, L.P., proposes to...

2012-12-14

319

77 FR 74545 - Eagle Fund III-A, L.P.; License No. 07/07-0117: Notice Seeking Exemption Under Section 312 of the...  

Federal Register 2010, 2011, 2012, 2013

...SMALL BUSINESS ADMINISTRATION Eagle Fund III-A, L.P.; License No. 07...of Interest Notice is hereby given that Eagle Fund III-A, L.P., 101 S. Hanley...Rules and Regulations (13 CFR part 107). Eagle Fund III- A, L.P., proposes to...

2012-12-14

320

76 FR 76802 - Riverside Micro-Cap Fund II, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...No. 02/02-0646] Riverside Micro-Cap Fund II, L.P.; Notice Seeking Exemption...Notice is hereby given that Riverside Micro-Cap Fund II, L.P., 45 Rockefeller Center...13 CFR 107.730). Riverside Micro-Cap Fund II, L.P. proposes to provide...

2011-12-08

321

77 FR 7655 - Riverside Micro-Cap Fund II, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...No. 02/02-0646] Riverside Micro-Cap Fund II, L.P.; Notice Seeking Exemption...Notice is hereby given that Riverside Micro-Cap Fund II, L.P., 45 Rockefeller Center...13 CFR 107.730). Riverside Micro-Cap Fund II, L.P. proposes to provide...

2012-02-13

322

77 FR 70812 - United States v. Star Atlantic Waste Holdings, L.P., Veolia Environnement S.A. and Veolia ES...  

Federal Register 2010, 2011, 2012, 2013

...JUSTICE Antitrust Division United States v. Star Atlantic Waste Holdings, L.P., Veolia...Columbia in United States of America v. Star Atlantic Waste Holdings, L.P., Veolia...alleging that the proposed acquisition by Star Atlantic Waste Holdings, L.P. of...

2012-11-27

323

Use of percutaneous endoscopy to place syringopleural or cystoperitoneal cerebrospinal fluid shunts: technical note.  

PubMed

The authors describe a technique for percutaneous endoscopic shunt placement to treat clinically symptomatic spinal cysts. Seven patients underwent the procedure--five with syringomyelia, one with a symptomatic perineurial cyst, and one with a large arachnoid cyst. In all patients the shunt was successfully placed, and clinical improvement occurred in six. In four patients the entire procedure was performed endoscopically, whereas in three conversion to an open surgical exposure was required for safe access of a syrinx cavity. Overall, however, the pleural or peritoneal catheter was successfully placed endoscopically in all seven patients. There were two cases of postoperative positional headaches of which one required valve revision. In one case the catheter migrated and required repositioning. Percutaneous endoscopic shunt placement appears feasible in appropriately selected patients. PMID:15871494

Guest, James D; Silbert, Lisa; Casas, Carlos E

2005-04-01

324

Selection of capacitors for the self regulated short shunt self excited induction generator  

SciTech Connect

The self regulating feature of a Self Excited Induction Generator (SEIG) by connecting additional capacitors is examined. The system consisting of both shunt and series capacitors has been analyzed. A methodology has been explained to choose appropriate set of values of these capacitors for desired voltage regulation. Performance of short and long shunt configurations has been compared which shows the superiority of the short shunt connection. Results of a detailed investigation on a conventional 3.7 kW induction motor operated as a SEIG are presented to illustrate the effectiveness of the proposed method. Close agreement between predicted and test results has been observed thereby establishing the validity of the analysis carried out and the criterion adopted.

Shridhar, L.; Singh, B.; Jha, C.S.; Singh, B.P.; Murthy, S.S. [IIT-Delhi, New Delhi (India). Dept. of Electrical Engineering] [IIT-Delhi, New Delhi (India). Dept. of Electrical Engineering

1995-03-01

325

Transient performance of the self regulated short shunt self excited induction generator  

SciTech Connect

This paper is an extension of the Authors` previous work on the self regulated short shunt Self Excited Induction Generator (SEIG). A detailed investigation is carried out on the transient behavior of the short shunt SEIG system subjected to different dynamic conditions. Analytical model incorporating cross-saturation effect, has been used to predict performance of the SEIG. Experimental results are presented along with the simulated ones. Response of the system to disturbances reveals its excellent transient performance. The system has a good overload capability and is free from operational problems related with short circuit and loss of excitation. By presenting typical results of a 3.7kW, three-phase squirrel cage machine, suitability of the short shunt SEIG for a simple, rugged and self regulated stand alone generating system, is established.

Shridhar, L.; Singh, B.; Jha, C.S. [IIT Delhi, New Delhi (India). Dept. of Electrical Engineering] [IIT Delhi, New Delhi (India). Dept. of Electrical Engineering

1995-06-01

326

Shunt flow evaluation in congenital heart disease based on two-dimensional speckle tracking.  

PubMed

High-frame-rate ultrasound speckle tracking was used for quantification of peak velocity in shunt flows resulting from septal defects in congenital heart disease. In a duplex acquisition scheme implemented on a research scanner, unfocused transmit beams and full parallel receive beamforming were used to achieve a frame rate of 107 frames/s for full field-of-view flow images with high accuracy, while also ensuring high-quality focused B-mode tissue imaging. The setup was evaluated in vivo for neonates with atrial and ventricular septal defects. The shunt position was automatically tracked in B-mode images and further used in blood speckle tracking to obtain calibrated shunt flow velocities throughout the cardiac cycle. Validation toward color flow imaging and pulsed wave Doppler with manual angle correction indicated that blood speckle tracking could provide accurate estimates of shunt flow velocities. The approach was less biased by clutter filtering compared with color flow imaging and was able to provide velocity estimates beyond the Nyquist range. Possible placements of sample volumes (and angle corrections) for conventional Doppler resulted in a peak shunt velocity variations of 0.49-0.56 m/s for the ventricular septal defect of patient 1 and 0.38-0.58 m/s for the atrial septal defect of patient 2. In comparison, the peak velocities found from speckle tracking were 0.77 and 0.33 m/s for patients 1 and 2, respectively. Results indicated that complex intraventricular flow velocity patterns could be quantified using high-frame-rate speckle tracking of both blood and tissue movement. This could potentially help increase diagnostic accuracy and decrease inter-observer variability when measuring peak velocity in shunt flows. PMID:25023104

Fadnes, Solveig; Nyrnes, Siri Ann; Torp, Hans; Lovstakken, Lasse

2014-10-01

327

Palliative treatment of malignant refractory ascites by positioning of Denver peritoneovenous shunt.  

PubMed

Malignant ascites is relatively common in patients with certain types of end-stage cancer. Traditional treatments based on fluid and salt restriction and diuretic therapy often are not able to contain neoplastic ascites. These patients consequently undergo repeated abdominal paracentesis, with further plasma protein loss and risk of injury to abdominal viscera. The aim of this study was to evaluate our experience with Denver peritoneovenous shunt and the outcome of patients with malignant ascites and suggest some modifications to improve device patency. From February 1997 to December 1999, 44 Denver peritoneovenous shunts were placed in 42 patients, 17 women and 25 men, aged between 38 and 77 years (mean, 62.3), affected with malignant ascites due to advanced abdominal cancer. At the time of admission, 72% of patients had pain, 88% dysphagia, 66% nausea and/or vomiting, and 83% dyspnea. Eleven patients underwent local anesthesia with lidocaine and 33 general anesthesia with rapidly metabolized drugs. In 27 cases we used the peritoneal-internal jugular right vein surgical approach and in 3 cases the peritoneal-femoral vein surgical access, joining the saphena vein to the cross. In 10 cases, a radiological positioning of the Denver peritoneovenous shunt was effected by a trans-subclavian access. Relief of ascites symptoms was obtained in 87.5% of cases, with reduction of dyspnea, an increased appetite and improved ambulation. Denver peritoneovenous shunt is a good device to relieve malignant ascites, thereby reducing the risk of complications and the number of hospital admissions due to repeated paracentesis and consequently improving the quality of life. A careful patient selection, an accurate follow-up and some device modifications could improve the shunt performance, allowing a wider application of the Denver peritoneovenous shunt. PMID:12088251

Zanon, Claudio; Grosso, Maurizio; Aprà, Fabrizio; Clara, Renzo; Bortolini, Massimiliano; Quaglino, Francesco; Cornaglia, Silvia; Simone, Paolo

2002-01-01

328

Link between the CSF shunt and achievement in adults with spina bifida  

PubMed Central

OBJECTIVES—A few enterprising adults with shunt treated spina bifida live independently in the community, have a job in competitive employment, and drive to work in their own car. By contrast others with similar disability but lacking their motivation remain dependent on care and supervision. The aim of this study was to identify events in the history of their shunt which may have influenced their subsequent achievement.?METHODS—Between June 1963 and January 1971 117 babies born in East Anglia with open spina bifida had their backs closed regardless of the severity of their condition. When reviewed in 1997 every case was ascertained. Sixty had died and the 57 survivors had a mean age of 30. These were assigned to two groups: achievers and non-achievers, according to their attainments in independence, employment, and use of a car.?RESULTS—Of the 57 survivors nine had no shunt and eight of these were achievers. All were of normal intelligence (IQ?80) and only one was severely disabled. Of the 48 with shunts only 20 were achievers (OR 11.2, 95% confidence interval (95% CI) 1.3-96.8). Lack of achievement in these 48 was associated with revisions of the shunt, particularly when revisions were performed after the age of 2. Sixteen patients had never required a revision and 11 (69%) were achievers; 10 had had revisions only during infancy and five (50%) were achievers; 22 had had revisions after their second birthday and only four (18%) were achievers (p<0.001). Elective revisions were not performed in this cohort and in 75% of patients revisions had been preceded by clear symptoms of raised intracranial pressure.?CONCLUSION—Revisions of the shunt, particularly after the age of 2, are associated with poor long term achievement in adults with spina bifida.?? PMID:10519863

Hunt, G.; Oakeshott, P.; Kerry, S.

1999-01-01

329

Predisposing Factors Related to Shunt-Dependent Chronic Hydrocephalus after Aneurysmal Subarachnoid Hemorrhage  

PubMed Central

Objective Hydrocephalus is a common sequelae of aneurysmal subarachnoid hemorrhage (SAH) and patients who develop hydrocephalus after SAH typically have a worse prognosis than those who do not. This study was designed to identify factors predictive of shunt-dependent chronic hydrocephalus among patients with aneurysmal SAH, and patients who require permanent cerebrospinal fluid diversion. Methods Seven-hundred-and-thirty-four patients with aneurysmal SAH who were treated surgically between 1990 and 2006 were retrospectively studied. Three stages of hydrocephalus have been categorized in this paper, i.e., acute (0-3 days after SAH), subacute (4-13 days after SAH), chronic (?14 days after SAH). Criteria indicating the occurrence of hydrocephalus were the presence of significantly enlarged temporal horns or ratio of frontal horn to maximal biparietal diameter more than 30% in computerized tomography. Results Overall, 66 of the 734 patients (8.9%) underwent shunting procedures for the treatment of chronic hydrocephalus. Statistically significant associations among the following factors and shunt-dependent chronic hydrocephalus were observed. (1) Increased age (p < 0.05), (2) poor Hunt and Hess grade at admission (p < 0.05), (3) intraventricular hemorrhage (p < 0.05), (4) Fisher grade III, IV at admission (p < 0.05), (5) radiological hydrocephalus at admission (p < 0.05), and (6) post surgery meningitis (p < 0.05) did affect development of chronic hydrocephalus. However the presence of intracerebral hemorrhage, multiple aneurysms, vasospasm, and gender did not influence on the development of shunt-dependent chronic hydrocephalus. In addition, the location of the ruptured aneurysms in posterior cerebral circulation did not correlate with the development of shunt-dependent chronic hydrocephalus. Conclusion Hydrocephalus after aneurysmal SAH seems to have a multifactorial etiology. Understanding predisposing factors related to the shunt-dependent chronic hydrocephalus may help to guide neurosurgeons for better treatment outcomes. PMID:19096639

Kwon, Jae-Hyun; Sung, Soon-Ki; Song, Young-Jin; Choi, Hyu-Jin; Huh, Jae-Taeck

2008-01-01

330

Interaction of cerebrovascular disease and contralateral carotid occlusion in prediction of shunt insertion during carotid endarterectomy  

PubMed Central

Introduction To assess the possible role and the interaction of cerebrovascular disease and vascular stenosis on the necessity of shunt insertion during carotid endarterectomy (CEA). Material and methods Eighty consecutive patients undergoing CEA under regional anaesthesia were prospectively enrolled. Patients were divided into two groups depending on whether they were shunted or not. The measured end-points were co-morbidities degree of contralateral and carotid stenosis and other intra- and postoperative outstanding parameters. ANOVA, Student's t and ?2 tests were used (p<0.05). Variables differing significantly between groups and potential confounders were used in backward stepwise logistic regression to estimate the relative risk (RR, 95% CI) of shunt. In addition Wald's test (p<0.05) with and without adjustments for potential confounders was used with various different multivariate analysis models. Results Contralateral stenosis and cerebral vascular accidents (CVA) were more frequently observed in shunted patients. The RR for patients with contralateral stenosis ? 50% was 1.3 (95% CI 1.0-1.5) and for patients with previous CVA was 1.2 (95% CI 1.0-1.4). For contralateral stenosis and CVA together the RR increased to 7.7 (95% CI 1.0-14.4). A model based on contralateral stenosis and CVA was found to be statistically significant (p=0.003) for shunt (RR=1.1, 95% CI 1.0-2.1). Relative excess risk due to interaction of both factors was 6.2. Conclusions The findings suggest that patients with contralateral stenosis ? 50% and previous CVA have a higher risk of requiring shunt use during CEA than patients with these risk factors separately. PMID:22661995

Plaza-Martinez, Angel; Hernandez-Cadiz, Maria J.; Soliveres-Ripoll, Juan; Solaz-Roldan, Cristina; Morales-Suarez-Varela, Maria M.

2012-01-01

331

Cardiac output and shunt during voluntary activity at different temperatures in the turtle, Trachemys scripta.  

PubMed

Red-eared slider turtles (Trachemys scripta) were chronically instrumented with blood flow probes for a long-term study of voluntary behavior in an enriched laboratory setting. Cardiovascular measures consisting of total cardiac output (Q(tot)), pulmonary blood flow (Q(pul)), systemic blood flow (Q(sys)), net cardiac shunt (Q(shunt)), heart rate (HR), and stroke volume (SV) were obtained during spontaneous activity at a constant body temperature (Tb=2 degrees C) and at unstable (variable) T(b)'s ranging from 19 degrees to 37 degrees C. The effects of temperature and activity differed between the pulmonary and systemic circuits, with increases in Q(sys) due to HR alone, while both HR and SV contributed to gains in Q(pul). At stable 20 degrees C, cardiovascular responses during diving, submerged swimming, and walking were qualitatively similar, and increases in Q(tot) during activity ( approximately 2 x resting levels) were due to greater gains in Q(pul) than Q(sys). At unstable T(b)'s and in general, net Q(shunt) while active depended on the integration of individual physiological influences such as heating, cooling, and initial behavioral state acting on the cardiovascular system. During activity, net left-to-right (L-R) shunts predominated at constant T(b) of 20 degrees C (mean shunt fraction approximately 30%-40%), while both net L-R and right-to-left (R-L) shunts of varying size were found at unstable T(b)'s (19 degrees - 37 degrees C). PMID:14671716

Krosniunas, Egle H; Hicks, James W

2003-01-01

332

Effect of Shunting of Collateral Flow into the Venous System on Arteriogenesis and Angiogenesis in Rabbit Hind Limb  

PubMed Central

The aim of this study was to characterize the vascular remodeling in the external iliac artery (EIA) and the lower leg muscles in a rabbit shunt model created between the distal stump of the occluded femoral artery and the accompanying vein. Histology and immunoconfocal microscopy were used in this study. We found that: 1) both endothelial nitric oxide synthase (eNOS) and phosphorylated eNOS (P-eNOS) proteins were significantly increased in the shunt-side EIA; 2) matrix metalloproteinase-2 (MMP-2) expression was 5.5 times in shunt side EIA over that in normal EIA; 3) intercellular adhension molecule-1 (ICAM-1) expression was strongly induced in endothelial cells (EC) and vascular adhension molecule-1 (VCAM-1) expression was significantly increased in both EC and the adventitia of the shunt-side EIA; 4) augmentation of cell proliferation and extracellular proteolysis by macrophage infiltration was observed in shunt-side EIA; 5) cell proliferation was active in shunt side EIA, but quiet in shunt side lower leg’s arterial vessels; 6) capillary density in shunt side lower leg muscles was 2 times over that in normal side. In conclusion, our data demonstrate the paradigm that the power of shear stress takes the reins in arteriogenesis, whereas ischemia in angiogenesis, but not in arteriogenesis. PMID:23554534

Yang, Bao-lin; Wu, Song; Wu, Xiaoqiong; Li, Ming Bo; Zhu, Wu; Guan, Yinglu; Liu, Li-Hua; Luo, Ming-ying; Cai, Wei-Jun; Schaper, Jutta; Schaper, Wolfgang

2013-01-01

333

A comparative study of two high performance current control techniques for three-phase shunt active power filters  

Microsoft Academic Search

In recent years, the increase of non-linear loads in electrical power system has sparked the research in power quality issue. The shunt active power filter (SAPF) is a power electronic device which has been developed to improve power quality. The current control of shunt power filters is critical since poor control can reinforce existing harmonic problems. Various control strategies have

Wanchak Lenwari; Milijana Odavic

2009-01-01

334

EFFECTS OF SERIES AND SHUNT FACTS DEVICES IN TRANSIENT STABILITY ENHANCEMENT OF MULTI-MACHINE POWER SYSTEMS  

Microsoft Academic Search

In this paper a study is performed on Transient Stability enhancement in multi-machine power systems using Unified Power Flow Controller (UPFC). The paper uses the Injection Model of UPFC and series quadrature voltage injection and shunt compensation used for oscillation damping and then the effects of series and shunt compensation separately and together analyzed. Then different locations for UPFC in

S. Javad Sajjadi; M. Hasan Mohseninejad; Saeed Afsharnia

335

Theoretical Prediction of the Quench Behavior of a SFCL Module Having a BSCCO-2212 Bulk Coil and a Shunt Coil  

Microsoft Academic Search

This paper deals with theoretical prediction of the quench behavior for a superconducting fault current limiter (SFCL) module. The SFCL module consists of a monofllar type BSCCO-2212 bulk and a shunt coil made of copper or brass. The BSCCO-2212 bulk coil is placed inside the shunt coil, and they are connected in parallel. In order to analyse the quench behavior

H. M. Kim; K. B. Park; B. W. Lee; J. S. Kang; I. S. Oh; J. Sim; O. B. Hyun; H. R. Kim; H. G. Lee

2007-01-01

336

Neural learning algorithm based power quality enhancement for three phase three wire distribution system utilizing shunt active power filter strategy  

Microsoft Academic Search

This paper explores the application of artificial intelligence on solving the power quality problems by using the shunt active power filter strategy for three phase three wire distribution system. The unit vector template generation control technique is modeled as current controller for the shunt active power filter strategy. The proportional and integral (PI) controller is designed to minimize error between

A. Senthil Kumar; P. Ajay-D-Vimal Raj

2011-01-01

337

Experimental rotordynamic coefficient results for: (a) a labyrinth seal with and without shunt injection and (b) a honeycomb seal  

E-print Network

been modified by (a) using swirl brakes, and (b) using shunt injection. In some cases, labyrinth seals have been replaced entirely by honeycomb seals. In shunt injection, the gas is taken from the diff-user or discharge volute, and injected...

Soto Azuaje, Elias Antonio

2012-06-07

338

A novel multimode negative inductance negative resistance shunted electromagnetic damping and its application on a cantilever plate  

NASA Astrophysics Data System (ADS)

Based on the characteristic of the electromagnetic damping, a novel multimode vibration control treatment, negative inductance negative resistance electromagnetic shunt damping (NINR-EMSD), is proposed and employed to control multimode vibration of a cantilever plate. The negative inductance of the shunt impedance can cancel the inherent inductance of the electromagnet, and the impedance of circuit consisted of the coils and shunt will be a pure resistance and the shunt current will be frequency independent when the inductance of the shunt and the electromagnet are equal with each other. The negative resistance cancels the resistance of electromagnet, and as a result the resistance and the current of the closed circuit will change, which make it feasible to control the multimode vibration of the system. Electromechanical coupling coefficient is obtained based on the equivalent current method. The governing equation of the plate with the electromagnetic shunt damping (EMSD) is established according to Hamilton's principle. Multimode vibration control of the system is simulated and experiments are carried out to verify the performance of the NINR-EMSD. The numerical predictions and experimental results agree well with each other and show that: the negative inductance negative resistance (NINR) of the shunt impedance can increase the damping of the structure notably; the decrease of the resistance of shunt impedance have a significant contribution to the improvement of vibration control performance; the first four modes vibration of the plate can be suppressed simultaneously with the NINR-EMSD.

Zhang, Xinong; Niu, Hongpan; Yan, Bo

2012-05-01

339

Congenital multiple arterioportal fistula: a case report treated with portocaval shunt.  

PubMed

A case of 48-year-old man, with diffuse arterioportal fistula (APF) considered congenital in origin, is described. The patient presented with recurring intractable variceal hemorrhage which was treated by endoscopic ligation or sclerotherapy. In this case, gastroduodenal artery and branches of mesenterial artery were diffusely involved, so these lesions could not be resected. Portocaval shunt between the superior mesenteric vein and the right iliac vein was successfully performed. Follow-up endoscopic examination one year later revealed no evidence of esophageal and gastric varices. To our knowledge, this is the second case in which a patient underwent portocaval shunt successfully for congenital APF. PMID:9356847

Onitsuka, A; Katagiri, Y; Shibata, M; Hirose, H; Shimazaki, M

1997-01-01

340

Understanding shunting behavior in hot-wire-deposited amorphous silicon solar cells  

NASA Astrophysics Data System (ADS)

Amorphous silicon solar cells, in which the absorbing layer is deposited using the hot-wire chemical vapor deposition (CVD) technique, have potential advantages over solar cells made with the standard plasma enhanced CVD technique. Although it is possible to make high-quality solar cells, many cells occasionally show shunting behavior and better control over the variation in cell performance must be obtained. In this letter, we prove that this behavior is directly correlated with the filament age, and we present different methods for avoiding shunted cells and for improving the reproducibility of cell performance.

van Veen, M. K.; Schropp, R. E. I.

2003-01-01

341

Abdominal Actinomycosis Associated with a Sigmoid Colon Perforation in a Patient with a Ventriculoperitoneal Shunt  

PubMed Central

Abdominal actinomycosis causing hydronephrosis in a patient with a ventriculoperitoneal shunt is very rare. A 27-year-old female patient was admitted complaining of lower abdominal pain. She had undergone ventriculoperitoneal shunt surgery 10 years ago. Abdominal Ultrasonography and a CT scan demonstrated an inflammatory mass in the lower left quadrant of the abdomen causing obstructive hydroureter and hydronephrosis. Laparotomy revealed a diffusely infiltrating mass involving the small bowel, mesentery, and sigmoid colon, and a 1 cm perforation in the sigmoid colon. Actinomycosis was diagnosed upon histological examination. After treatment with antibiotics and surgery, the patient's condition improved. PMID:16941752

Jung, Eun-Young; Choi, Su-Nyoung; Park, Dong-Jun; You, Jin-Jong; Kim, Hyun-Jung

2006-01-01

342

Programmable hydrocephalus shunt which cannot be unwillingly re-adjusted even in 3T MRI magnet  

E-print Network

BioMed Central Page 1 of 1 (page number not for citation purposes) Cerebrospinal Fluid Research Open AccessPoster presentation Programmable hydrocephalus shunt which cannot be unwillingly re-adjusted even in 3T MRI magnet David Allin, Marek... - ming proved to be easy and reliable. Strong magnetic fields (3Tesla MRI scanner) are not able to change the pro- gramming of the valve. Conclusion From the point of view of its hydrodynamic performance, the ProGAV shunt is reliable, differential...

2006-12-21

343

Pancreaticoportal Fistula and Disseminated Fat Necrosis After Revision of a Transjugular Intrahepatic Portosystemic Shunt  

SciTech Connect

A 59-year old man with alcohol related cirrhosis and portal hypertension was referred for transjugular intrahepatic portosystemic shunt (TIPS) to treat his refractory ascites. Ten years later, two sequential TIPS revisions were performed for shunt stenosis and recurrent ascites. After these revisions, he returned with increased serum pancreatic enzyme levels and disseminated superficial fat necrosis; an iatrogenic pancreaticoportal vein fistula caused by disruption of the pancreatic duct was suspected. The bare area of the TIPS was subsequently lined with a covered stent-graft, and serum enzyme levels returned to baseline. In the interval follow-up period, the patient has clinically improved.

Klein, Seth J., E-mail: kleins@mir.wustl.edu; Saad, Nael [Washington University School of Medicine, Interventional Radiology Section, Mallinckrodt Institute of Radiology (United States)] [Washington University School of Medicine, Interventional Radiology Section, Mallinckrodt Institute of Radiology (United States); Korenblat, Kevin [Washington University School of Medicine, Division of Gastroenterology, Department of Internal Medicine (United States)] [Washington University School of Medicine, Division of Gastroenterology, Department of Internal Medicine (United States); Darcy, Michael D. [Washington University School of Medicine, Interventional Radiology Section, Mallinckrodt Institute of Radiology (United States)] [Washington University School of Medicine, Interventional Radiology Section, Mallinckrodt Institute of Radiology (United States)

2013-04-15

344

LP 400-22, A very low-mass and high-velocity white dwarf  

E-print Network

We report the identification of LP 400-22 (WD 2234+222) as a very low-mass and high-velocity white dwarf. The ultraviolet GALEX and optical photometric colors and a spectral line analysis of LP 400-22 show this star to have an effective temperature of 11080+/-140 K and a surface gravity of log g = 6.32+/-0.08. Therefore, this is a helium core white dwarf with a mass of 0.17 M_solar. The tangential velocity of this white dwarf is 414+/-43 km/s, making it one of the fastest moving white dwarfs known. We discuss probable evolutionary scenarios for this remarkable object.

Adela Kawka; Stephane Vennes; Terry D. Oswalt; J. Allyn Smith; Nicole M. Silvestri

2006-04-21

345

LP 400-22, A Very Low Mass and High-Velocity White Dwarf  

NASA Technical Reports Server (NTRS)

We report the identification of LP 400-22 (WD 2234+222) as a very low mass and high-velocity white dwarf. The ultraviolet GALEX and optical photometric colors and a spectral line analysis of LP 400-22 show this star to have an effective temperature of 11,080+/-140 K and a surface gravity of log g = 6.32 +/-0.08. Therefore, this is a helium-core white dwarf with a mass of 0.17 M,. The tangential velocity of this white dwarf is 414+/-43 km/s, making it one of the fastest moving white dwarfs known. We discuss probable evolutionary scenarios for this remarkable object.

Kawka, Adela; Vennes, Stephane; Oswalt, Terry D.; Smith, J. Allyn; Silvestri, Nicole M.

2006-01-01

346

Greedy facility location algorithms analyzed using dual fitting with factor-revealing LP  

Microsoft Academic Search

In this article, we will formalize the method of dual fitting and the idea of factor-revealing LP. This combination is used to design and analyze two greedy algorithms for the metric uncapacitated facility location problem. Their approximation factors are 1.861 and 1.61, with running times of O(m log m) and O(n3), respectively, where n is the total number of vertices

Kamal Jain; Mohammad Mahdian; Evangelos Markakis; Amin Saberi; Vijay V. Vazirani

2003-01-01

347

Lead geochronology of zircon by LaserProbe-inductively coupled plasma mass spectrometry (LP-ICPMS)  

Microsoft Academic Search

LaserProbe-inductively coupled plasma mass spectrometry (LP-ICPMS) provides a sensitive, fast, and simple means to determine 207 Pb \\/ 206 Pb ages in single zircon grains. A Nd:YAG laser is used to irradiate the zircon surface and leaves a cylindrical pit of 30-60 m, from which the vaporised materials are transported by argon gas to a Fisons-VG PQII+ ICPMS for analysis.

Rui Feng; Nuno Machado; John Ludden

1993-01-01

348

Korovkin-Type Theorems in Weighted Lp-Spaces via Summation Process  

PubMed Central

Korovkin-type theorem which is one of the fundamental methods in approximation theory to describe uniform convergence of any sequence of positive linear operators is discussed on weighted Lp spaces, 1 ? p < ? for univariate and multivariate functions, respectively. Furthermore, we obtain these types of approximation theorems by means of 𝒜-summability which is a stronger convergence method than ordinary convergence. PMID:24305688

Acar, Tuncer; Dirik, Fadime

2013-01-01

349

LP Decoding Corrects a Constant Fraction of Errors (CORC Technical Report TR-2003-08)  

E-print Network

that if the Tanner graph modeling the code has regular left degree c and expands by a factor more than c on all and Vontobel (Turbo Codes, 2003) shows that LP decoding and min-sum decoding of LDPC codes are closely related partially supported by NSF grant IIS-9988642, ARO MURI DAA19- 02-1-0383. #12;1 Introduction Turbo codes [3

Malkin, Tal

350

LP Decoding Corrects a Constant Fraction of Errors (CORC Technical Report TR-2003-08)  

E-print Network

that if the Tanner graph modeling the code has regular left degree c and expands by a factor more than Ã?c on all). Recent work by Koetter and Vontobel (Turbo Codes, 2003) shows that LP decoding and min-sum decoding@eecs.berkeley.edu. Research partially supported by NSF grant IIS-9988642, ARO MURI DAA19- 02-1-0383. #12; 1 Introduction Turbo

Malkin, Tal

351

78 FR 11567 - Airworthiness Directives; Gulfstream Aerospace LP (Type Certificate Previously Held by Israel...  

Federal Register 2010, 2011, 2012, 2013

We are adopting a new airworthiness directive (AD) for all Gulfstream Aerospace LP (Type Certificate Previously Held by Israel Aircraft Industries, Ltd.) Model Gulfstream G150 airplanes. This AD was prompted by a review that determined that the runway slope and anti-ice corrections to V1 and take-off distances in the Gulfstream G150 Airplane Flight Manual (AFM) were presented in a......

2013-02-19

352

Discovery of radio emission from the brown dwarf LP944-20.  

PubMed

Brown dwarfs are not massive enough to sustain thermonuclear fusion of hydrogen at their centres, but are distinguished from gas-giant planets by their ability to burn deuterium. Brown dwarfs older than approximately 10 Myr are expected to possess short-lived magnetic fields and to emit radio and X-rays only very weakly from their coronae. An X-ray flare was recently detected on the brown dwarf LP944-20, whereas previous searches for optical activity (and one X-ray search) yielded negative results. Here we report the discovery of quiescent and flaring radio emission from LP944-20, with luminosities several orders of magnitude larger than predicted by the empirical relation between the X-ray and radio luminosities that has been found for many types of stars. Interpreting the radio data within the context of synchrotron emission, we show that LP944-20 has an unusually weak magnetic field in comparison to active M-dwarf stars, which might explain the previous null optical and X-ray results, as well as the strength of the radio emissions compared to those at X-ray wavelengths. PMID:11268202

Berger, E; Ball, S; Becker, K M; Clarke, M; Frail, D A; Fukuda, T A; Hoffman, I M; Mellon, R; Momjian, E; Murphy, N W; Teng, S H; Woodruff, T; Zauderer, B A; Zavala, R T

2001-03-15

353

Prospects for CW and LP operation of the European XFEL in hard X-ray regime  

E-print Network

The European XFEL will operate nominally at 17.5 GeV in SP (short pulse) mode with 0.65 ms long bunch train and 10 Hz repetition rate. A possible upgrade of the linac to CW (continuous wave) or LP (long pulse) modes with a corresponding reduction of electron beam energy is under discussion since many years. Recent successes in the dedicated R&D program allow to forecast a technical feasibility of such an upgrade in the foreseeable future. One of the challenges is to provide sub-Angstrom FEL operation in CW and LP modes. In this paper we perform a preliminary analysis of a possible operation of the European XFEL in the hard X-ray regime in CW and LP modes with the energies of 7 GeV and 10 GeV, respectively. We consider lasing in the baseline XFEL undulator as well as in a new undulator with a reduced period. We show that, with reasonable requirements on electron beam quality, lasing on the fundamental will be possible in sub-Angstrom regime. As an option for generation of brilliant photon beams at short wa...

Brinkmann, R; Sekutowicz, J; Yurkov, M V

2014-01-01

354

The Leptospiral Antigen Lp49 is a Two-Domain Protein with Putative Protein Binding Function  

SciTech Connect

Pathogenic Leptospira is the etiological agent of leptospirosis, a life-threatening disease that affects populations worldwide. Currently available vaccines have limited effectiveness and therapeutic interventions are complicated by the difficulty in making an early diagnosis of leptospirosis. The genome of Leptospira interrogans was recently sequenced and comparative genomic analysis contributed to the identification of surface antigens, potential candidates for development of new vaccines and serodiagnosis. Lp49 is a membrane-associated protein recognized by antibodies present in sera from early and convalescent phases of leptospirosis patients. Its crystal structure was determined by single-wavelength anomalous diffraction using selenomethionine-labelled crystals and refined at 2.0 Angstroms resolution. Lp49 is composed of two domains and belongs to the all-beta-proteins class. The N-terminal domain folds in an immunoglobulin-like beta-sandwich structure, whereas the C-terminal domain presents a seven-bladed beta-propeller fold. Structural analysis of Lp49 indicates putative protein-protein binding sites, suggesting a role in Leptospira-host interaction. This is the first crystal structure of a leptospiral antigen described to date.

Oliveira Giuseppe,P.; Oliveira Neves, F.; Nascimento, A.; Gomes Guimaraes, B.

2008-01-01

355

Prospects for CW and LP operation of the European XFEL in hard X-ray regime  

NASA Astrophysics Data System (ADS)

The European XFEL will operate nominally at 17.5 GeV in SP (short pulse) mode with 0.65 ms long bunch train and 10 Hz repetition rate. A possible upgrade of the linac to CW (continuous wave) or LP (long pulse) modes with a corresponding reduction of electron beam energy is under discussion for many years. Recent successes in the dedicated R&D program allow to forecast a technical feasibility of such an upgrade in the foreseeable future. One of the challenges is to provide sub-Ångström FEL operation in CW and LP modes. In this paper we perform a preliminary analysis of a possible operation of the European XFEL in the hard X-ray regime in CW and LP modes with electron energies of 7 GeV and 10 GeV, respectively. We consider lasing in the baseline XFEL undulator as well as in a new undulator with a reduced period. We show that, with reasonable requirements on electron beam quality, lasing on the fundamental will be possible in the sub-Ångström regime. As an option for generating brilliant photon beams at short wavelengths we also consider harmonic lasing that has recently attracted a significant attention.

Brinkmann, R.; Schneidmiller, E. A.; Sekutowicz, J.; Yurkov, M. V.

2014-12-01

356

77 FR 41358 - Bayer CropScience LP; Availability of Petition, Plant Pest Risk Assessment, and Environmental...  

Federal Register 2010, 2011, 2012, 2013

...DEPARTMENT OF AGRICULTURE Animal and Plant Health Inspection Service [Docket No...CropScience LP; Availability of Petition, Plant Pest Risk Assessment, and Environmental...Herbicide Tolerance AGENCY: Animal and Plant Health Inspection Service, USDA....

2012-07-13

357

75 FR 17706 - Flint Hills Resources, LP, Complainant v. Mid-America Pipeline Company, LLC, Respondent; Notice...  

Federal Register 2010, 2011, 2012, 2013

...Resources, LP, Complainant v. Mid-America Pipeline Company, LLC, Respondent...Complainant) filed a complaint against Mid-America Pipeline Company, LLC (Respondent...refinery grade butane on the Respondent's Northern interstate pipeline system as...

2010-04-07

358

75 FR 8921 - Grant of Authority for Subzone Status; Brightpoint North America L.P. (Cell Phone Kitting and...  

Federal Register 2010, 2011, 2012, 2013

...Subzone Status; Brightpoint North America L.P. (Cell Phone Kitting and Distribution) Indianapolis, IN Pursuant...authority to establish a special-purpose subzone at the cell phone kitting and distribution facilities of Brightpoint...

2010-02-26

359

76 FR 77298 - Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...Business Investment Act, Conflicts of Interest Notice is hereby given that Ironwood Mezzanine Fund II, L.P., 55 Nod Rd., Avon, CT 06001, a Federal Licensee under the Small Business Investment Act of 1958, as amended (``the Act''), in...

2011-12-12

360

78 FR 77770 - Ironwood Equity Fund, LP; Notice Seeking Exemption Under Section 312 of the Small Business...  

Federal Register 2010, 2011, 2012, 2013

...the Small Business Investment Act, Conflicts of Interest Notice is hereby given that Ironwood Equity Fund, LP, 45 Nod Road, Avon, CT 06001, a Federal Licensee under the Small Business Investment Act of 1958, as amended (``the Act''), in...

2013-12-24

361

75 FR 32230 - Solutions Capital I, L.P.; Notice Seeking Exemption Under Section 312 of the Small Business...  

Federal Register 2010, 2011, 2012, 2013

...general corporate purposes. The financing is brought within the purview of Sec. 107.730(a)(1) of the Regulations because MCG Capital Corporation, an Associate of Solutions Capital I, L.P., owns more than ten [[Page 32231

2010-06-07

362

Accurate modal gain control in a multimode erbium doped fiber amplifier incorporating ring doping and a simple LP?? pump configuration.  

PubMed

We experimentally validate a numerical model to study multimode erbium-doped fiber amplifiers (MM-EDFAs). Using this model, we demonstrate the improved performance achievable in a step index MM-EDFA incorporating a localized erbium doped ring and its potential for Space Division Multiplexed (SDM) transmission. Using a pure LP?? pump beam, which greatly simplifies amplifier construction, accurate modal gain control can be achieved by carefully tuning the thickness of the ring-doped layer in the active fiber and the pump power. In particular, by optimizing the erbium-ring-doped structure and the length of active fiber used, over 20dB gain for both LP?? and LP?? signals with a maximum gain difference of around 2 dB across the C band are predicted for a pure LP?? pump beam delivering 250 mW power at 980 nm. PMID:23037207

Kang, Qiongyue; Lim, Ee-Leong; Jung, Yongmin; Sahu, Jayanta K; Poletti, Francesco; Baskiotis, Catherine; Alam, Shaif-Ul; Richardson, David J

2012-09-10

363

Model for Calculating Electrolytic Shunt Path Losses in Large Electrochemical Energy Conversion Systems  

NASA Technical Reports Server (NTRS)

Generalized analysis and solution techniques were developed to evaluate the shunt power losses in electrochemical systems designed with a common or circulating electrolyte supply. Sample data are presented for a hypothetical bulk energy storage redox system, and the general applicability of the analysis technique is discussed.

Prokopius, P. R.

1976-01-01

364

Liquid breathing - Prevention of pulmonary arterial-venous shunting during acceleration.  

NASA Technical Reports Server (NTRS)

Dependent pulmonary atelectasis, arterial-venous shunting, and downward displacement of the heart caused by the gravitational-inertial force environment were prevented in dogs breathing oxygenated liquid fluorocarbon in a whole-body water-immersion respirator. Partial closure of the major airways during part of the expiratory phase of liquid respiration was a significant problem initially but was minimized in subsequent studies.

Sass, D. J.; Ritman, E. L.; Caskey, P. E.; Banchero, N.; Wood, E. H.

1972-01-01

365

Usefulness of central venous oxygen saturation monitoring during bidirectional Glenn shunt.  

PubMed

A PediaSat™ oximetry catheter (PediaSat: Edwards Lifesciences Co., Ltd., Irvine, CA, U. S. A.), which facilitates continuous measurement of central venous oxygen saturation (ScvO2), may be useful for surgery for pediatric congenital heart disease. We used PediaSat during a bidirectional Glenn shunt. The patient was a 13-month-old boy. Under a diagnosis of left single ventricle (pulmonary atresia, right ventricular hypoplasia, atrial septal defect) and residual left aortic arch/left superior vena cava, a modified right Blalock-Taussig shunt was performed. Cyanosis deteriorated, so a bidirectional Glenn shunt was scheduled. After anesthesia induction, a 4.5 Fr double-lumen (8 cm) PediaSat was inserted through the right internal jugular vein for continuous ScvO2 monitoring. Furthermore, the probe of a near-infrared, mixed blood oxygen saturation-measuring monitor was attached to the forehead for continuous monitoring of the regional brain tissue mixed blood oxygen saturation (rSO2) (INVOS™ 5100C, Covidien; Boulder, CO, U. S. A.). Blockage of the right pulmonary artery and right superior vena cava decreased the oxygen saturation, ScvO2, and rSO2, but increased the central venous pressure. Although changes in ScvO2 were parallel to those in rSO2, the former showed more marked changes. A combination of ScvO2 and rSO2 for monitoring during Glenn shunt may be safer. PMID:24190047

Kakuta, Nami; Kawahito, Shinji; Mita, Naoji; Kambe, Noriko; Kasai, Asuka; Wakamatsu, Narutomo; Katayama, Toshiko; Soga, Tomohiro; Tada, Fumihiko; Kitaichi, Takashi; Kitagawa, Tetsuya; Kitahata, Hiroshi

2013-01-01

366

New control algorithms for series and shunt three-phase four-wire active power filters  

Microsoft Academic Search

This paper presents the general equations that relate the new concepts of instantaneous active and reactive power theory and the well known theory of Symmetrical Components, for the case of 3-phase 4-wire systems, where zero sequence components and harmonics may be present in both voltages and currents. Based on these equations, new control algorithms for 3-phase 4-wire shunt and series

M. Aredes; E. H. Watanabe

1995-01-01

367

Power quality improvement in three-phase four-wire systems using shunt active filters  

Microsoft Academic Search

This paper presents a shunt active filter control using the instantaneous power theory on a rotating reference frame for power quality improvement in 3-phase 4-wire system. By current space vector mapping on rotating reference frame, three linearly independent components are derived. The defined powers can be controlled by current vector components. The in-phase current vector component to voltage vector is

A. Esfandiari; M. Parniani; H. Mokhtari

2004-01-01

368

Detection of Right-to-Left Shunt with Ultrasound Contrast Agent and Transcranial Doppler Sonography  

Microsoft Academic Search

An international Consensus Meeting to determine a standard in the examination technique for the detection of right-to-left shunt (RLS) using contrast transcranial Doppler sonography (TCD) led to the following recommendations to standardize the examination procedure: The patient should be prepared with an 18-gauge needle inserted into the cubital vein and should be in the supine position. Insonation of at least

M. Jauss; E. Zanette

2000-01-01

369

Fibrous capsule formation of the peritoneal catheter tip in ventriculoperitoneal shunt: Two case reports  

PubMed Central

Background: A fibrous capsule formation of a peritoneal catheter tip has not previously been researched as a complication of ventriculoperitoneal (VP) shunts. Case Description: Two adult patients who had undergone a VP shunt for communicative hydrocephalus following subarachnoid hemorrhage caused by a ruptured aneurysm have been identified with malfunction of the VP shunt system by mild disturbance of consciousness and gait disturbance or loss of appetite. Hydrocephalus was diagnosed by computed tomography and the obstruction of the peritoneal catheter was revealed by shuntgraphy. Laparoscopy was performed and the peritoneal catheter tips were obstructed by fibrous white capsules that covered them. One was a thin membranous capsule like a stocking with two small endoluminal granulomas of the peritoneal catheter, and other one was a fibrous glossy white capsule like a sock. These fibrous capsules were excised by laparoscopy forceps without the conversion to a new peritoneal catheter. Following the procedure, the shunt functioned normally. The pathological diagnoses were peritoneum with foreign body reaction or hyalinization of membranous tissue surrounded by fibrous tissue. Conclusion: These fibrous capsules might be formed by the peritoneal reaction to cerebrospinal fluid as a foreign material. As such, a periodic medical check should be scheduled since a fibrous capsule of the peritoneal catheter tip might be formed again. PMID:25422787

Kano, Tomoaki

2014-01-01

370

The ?-aminobutyric acid shunt contributes to closing the tricarboxylic acid cycle in Synechocystis sp. PCC 6803.  

PubMed

A traditional 2-oxoglutarate dehydrogenase complex is missing in the cyanobacterial tricarboxylic acid cycle. To determine pathways that convert 2-oxoglutarate into succinate in the cyanobacterium Synechocystis sp. PCC 6803, a series of mutant strains, ?sll1981, ?slr0370, ?slr1022 and combinations thereof, deficient in 2-oxoglutarate decarboxylase (Sll1981), succinate semialdehyde dehydrogenase (Slr0370), and/or in ?-aminobutyrate metabolism (Slr1022) were constructed. Like in Pseudomonas aeruginosa, N-acetylornithine aminotransferase, encoded by slr1022, was shown to also function as ?-aminobutyrate aminotransferase, catalysing ?-aminobutyrate conversion to succinic semialdehyde. As succinic semialdehyde dehydrogenase converts succinic semialdehyde to succinate, an intact ?-aminobutyrate shunt is present in Synechocystis. The ?sll1981 strain, lacking 2-oxoglutarate decarboxylase, exhibited a succinate level that was 60% of that in wild type. However, the succinate level in the ?slr1022 and ?slr0370 strains and the ?sll1981/?slr1022 and ?sll1981/?slr0370 double mutants was reduced to 20-40% of that in wild type, suggesting that the ?-aminobutyrate shunt has a larger impact on metabolite flux to succinate than the pathway via 2-oxoglutarate decarboxylase. (13) C-stable isotope analysis indicated that the ?-aminobutyrate shunt catalysed conversion of glutamate to succinate. Independent of the 2-oxoglutarate decarboxylase bypass, the ?-aminobutyrate shunt is a major contributor to flux from 2-oxoglutarate and glutamate to succinate in Synechocystis sp. PCC 6803. PMID:24989231

Xiong, Wei; Brune, Daniel; Vermaas, Wim F J

2014-08-01

371

The use of the TDMAC-heparin shunt in replacement of the descending thoracic aorta.  

PubMed

The use of a flexible polyvinyl tube bonded with tridodecylmethylammonium-heparin (Gott) as a temporary shunt during the resection of lesions of the descending thoracic aorta has proven a safe and simple means of providing adequate circulation to the abdominal viscera and spinal cord. This technique avoids the metabolic consequences of ischemia to the lower body, diminishes left ventricular afterload during aortic clamping, and obviates the requirement for systemic anticoagulation associated with pump bypass. Between September 1970 and October 1974, 24 patients have been operated using the TDMAC shunt. There were two deaths (9%) among the 22 patients undergoing elective resections. Two patients with acutely dissecting and ruptured aneurysms expired. Followup data has been obtained on all patients from one to 46 months postoperative. The ease with which the shunt is inserted and its adaptability to varied clinical and anatomic situations is stressed. We feel that TDMAC-Heparin shunt provides the best method of circulatory support for elective operative procedures on the descending thoracic aorta. PMID:1130887

Connors, J P; Ferguson, T B; Roper, C L; Weldon, C S

1975-05-01

372

Shunt-assisted simultaneous quenches in series-connected resistive SFCL components  

Microsoft Academic Search

We investigated shunt-assisted quenches in resistive superconducting fault current limiter (SFCL) components based on YBCO thin films when they are connected in series. Slight differences in Ic between the components induces significant power imbalance, which causes uneven quenches between the components. The extremely fast superconductor-normal transition causes the uneven quenches. Therefore, an appropriate quench delay is needed for synchronized switching

Ok-Bae Hyun; Sang-Do Cha; Hye-Rim Kim; Hyo-Sang Choi; Si-Dol Hwang

2003-01-01

373

A High Performance Harmonic Current Control for Shunt Active Filters Based on Resonant Compensators  

Microsoft Academic Search

This paper proposes a very accurate harmonic current control for shunt active filters (SAF) using resonant compensators. The resonant control compensator based on sinusoidal internal model principle is introduced into the control system design in order to improve the control accuracy and performance for ac input signal. The proposed current control system is designed to operate with a single dq

Wanchak Lenwari; Mark Sumner; Pericle Zanchetta; Mihai Culea

2006-01-01

374

Comparison of Incidence and Risk Factors for Shunt-dependent Hydrocephalus in Aneurysmal Subarachnoid Hemorrhage Patients  

PubMed Central

Objective The objective of this study was to compare the incidence of ventricular shunt placement for shunt-dependent hydrocephalus (SDHC) after clipping versus coiling of ruptured aneurysms. Materials and Methods A retrospective review was conducted in 215 patients with aneurysmal subarachnoid hemorrhage (SAH) who underwent surgical clipping or endovascular coiling during the period from May 2008 to December 2011. Relevant clinical and radiographic data were analyzed with regard to the incidence of hydrocephalus and ventriculo-peritoneal shunt (VPS). Patients treated with clipping were assigned to Group A, while those treated with coiling were assigned to Group B. Results Of 215 patients (157 clipping, 58 coiling), no significant difference in the incidence of final VPS was observed between treatment modalities (15.3% vs. 10.3%) (p = 0.35). Independent risk factors for VPS for treatment of chronic hydrocephalus were as follows: (1) older than 65 years, (2) poorer Hunt-Hess grade IV and V, (3) Fisher grade III and IV, and (4) particularly initial presence of an intraventricular hemorrhage. Conclusion In this study comparing two modalities for treatment of aneurysm, there was no difference in the incidence of chronic hydrocephalus requiring VPS. A significantly higher rate of shunt dependency was observed for age older than 65 years, poor initial neurological status, and thick SAH with presence of initial intraventricular hemorrhage. By understanding these factors related to development of SDHC and results, it is expected that management of aneurysmal SAH will result in a better prognosis. PMID:25045646

Bae, In-Seok; Choi, Kyu-Sun; Chun, Hyoung-Joon

2014-01-01

375

Thoracoamniotic Shunting with Double-Basket Catheters for Fetal Chylothorax in the Second Trimester  

Microsoft Academic Search

The progress of a fetal severe pleural effusion at mid-trimester is extremely poor. We encountered a fetus that developed a severe left pleural effusion at 21 weeks of gestation. The pleural effusion was removed by thoracocentesis at 22 weeks. Cytology revealed abundant lymphocytes, suggesting chylothorax. However, a reaccumulation of pleural effusion with hydrops was subsequently noted, and a thoracoamniotic shunt

N. Murabayashi; T. Sugiyama; H. Kusaka; N. Sagawa

2007-01-01

376

Blood flow and the degree of shunting through the ductus venosus in the human fetus  

Microsoft Academic Search

Objectives: Our goal was to determine the degree of shunting through the ductus venosus in the human fetus and its possible association with fetal growth. Study Design: Blood flow in the umbilical vein and the fetal ductus venosus was measured in 197 low-risk pregnancies in a cross-sectional ultrasonographic study at a gestational age of 18 to 41 weeks. The degree

Torvid Kiserud; Svein Rasmussen; Svein Skulstad

2000-01-01

377

Comparison of models for subtractive and shunting lateral-inhibition in receptor-neuron fields  

Microsoft Academic Search

Two types of neuronal lateral inhibition in one-dimensional fields of receptors and neurons are considered. The first type, which has been demonstrated in the eye of Limulus, is called subtractive inhibition (SI): it assumes that neuronal activity depends on the difference between the total excitation and inhibition. The second type is called shunting inhibition (SHI): it assumes that inhibitory influences

G. G. Furman; Murray Hi

1965-01-01

378

Algorithmic Operations Research Vol.4 (2009) 102116 Recoverable Robustness for Train Shunting Problems  

E-print Network

of Electrical and Information Engineering, University of L'Aquila, Monteluco di Roio, 67040 L'Aquila, Italy problems, i.e. the reordering of train cars over a hump yard. The considered shunting problems can be seen] for an interesting survey), respectively. In par- ticular, a robust plan is an a priori plan that maintains

Frigioni, Daniele

379

A Novel Program for Shunt-Stub Impedance Matching with MatLab GUI  

Microsoft Academic Search

This paper introduces a program for shunt-stub impedance matching tuners. The basic idea is placing an impedance matching network between a load and a transmission line. As long as the load impedance has some nonzero real part, a matching network can always be found. However, matching the load over a band of frequencies will bring an increase in complexity. The

Qiang Sui; Lin Li; Kai Wang; Xiaodan Pan

2010-01-01

380

Effect of the Portacaval Shunt on Reperfusion Injury after 65% Hepatectomy in Pigs  

Microsoft Academic Search

Background: Portal flow diversion by portacaval shunts (PCS) has been shown to prevent primary graft nonfunction in liver transplantation using small-for-size grafts. In this study, we examine whether PCS can improve reperfusion injury after major hepatectomy in pigs. Materials and Methods: In 14 pigs, a partial PCS was constructed following 65% hepatectomy and 1 h of inflow ischemia. During 24

C. Farantos; N. Arkadopoulos; K. Theodoraki; G. Kostopanagiotou; K. Katis; K. Tzavara; I. Andreadou; K. Dimopoulou; E. Hatzoudi; T. Sidiropoulou; I. Skalkidis; A. Paphiti; V. Smyrniotis

2008-01-01

381

The natural history of portal hypertension after transjugular intrahepatic portosystemic shunts  

Microsoft Academic Search

BACKGROUND & AIMS: The effects of transjugular intrahepatic portosystemic shunt (TIPS) on portal hemodynamics, esophageal and gastric varices, and hepatic function have not been fully defined. The aim of this study was to define prospectively the effects of TIPS on portal pressures and flow, variceal resolution, and hepatic function.METHODS: Pressure and flow measurements were made by angiography and Doppler sonography,

AJ Sanyal; AM Freedman; VA Luketic; PP Purdum; ML Shiffman; J DeMeo; PE Cole; J Tisnado

1997-01-01

382

Transjugular intrahepatic portosystemic shunt for treatment of bleeding ectopic varices with portal hypertension  

Microsoft Academic Search

PURPOSE: In the setting of hepatic failure and portal hypertension, hemorrhage from stomal and rectal varices is a well-described problem. It has recently been suggested that transjugular intrahepatic portosystemic shunting may be useful in the therapy of bleeding from parastomal or anorectal varices in patients unresponsive to conservative therapy. METHODS: We retrospectively review our institution's experience of five patients with

David Shibata; David P. Brophy; Fredric D. Gordon; Harry T. Anastopoulos; Stephen M. Sentovich; Ronald Bleday

1999-01-01

383

Selective distal splenorenal shunts for intractable variceal bleeding in pediatric portal hypertension  

Microsoft Academic Search

The treatment of portal hypertension in the pediatric population has undergone an evolution toward less invasive methods of care. With the advent of endoscopic sclerotherapy, surgery is less common in the acute care of these patients. Few reports deal with the role of portosystemic shunting in the emergent management of variceal hemorrhage in children. To address this issue, the authors

Siân Evans; Mark Stovroff; Kurt Heiss; Richard Ricketts

1995-01-01

384

Transjugular Intrahepatic Portosystemic Shunt for the Treatment of Portal Hypertension in Noncirrhotic Patients with Portal Cavernoma  

PubMed Central

Background. The purpose of this study was to evaluate the safety and efficacy of transjugular intrahepatic portosystemic shunt (TIPS) placement in the management of portal hypertension in noncirrhotic patients with portal cavernoma. Methods. We conducted a single institution retrospective analysis of 15 noncirrhotic patients with portal cavernoma treated with TIPS placement. 15 patients (4 women and 11 men) were evaluated via the technical success of TIPS placement, procedural complications, and follow-up shunt patency. Results. TIPS placement was technically successful in 11 out of 15 patients (73.3%). Procedure-related complications were limited to a single instance of hepatic encephalopathy in one patient. In patients with successful shunt placement, the portal pressure gradient decreased from 25.8 ± 5.7 to 9.5 ± 4.2?mmHg (P < 0.001). TIPS dysfunction occurred in two patients during a median follow-up time of 45.2 months. Revision was not performed in one patient due to inadequate inflow. The other patient died of massive gastrointestinal bleeding in a local hospital. The remaining nine patients maintained functioning shunts through their last evaluation. Conclusions. TIPS is a safe and effective therapeutic treatment for noncirrhotic patients with symptomatic portal hypertension secondary to portal cavernoma. PMID:24868203

Luo, Xuefeng; Zhou, Biao; Yao, Denghua; Ma, Huaiyuan; Jiang, Mingshan; Zhang, Hailong; Li, Xiao

2014-01-01

385

Transient performance of the self regulated short shunt self excited induction generator  

Microsoft Academic Search

A detailed investigation is carried out on the transient behaviour of the short shunt self-excited induction generator (SEIG) system subjected to different dynamic conditions. An analytical model incorporating the cross-saturation effect has been used to predict the performance of the SEIG. Experimental results are presented along with the simulated values. Response of the system to disturbances reveals excellent transient performance.

L. Shridhar; Bhim Singh; C. S. Jha

1995-01-01

386

BYPASS SYSTEM FOR SHUNTING OF ELECTROMAGNETS FOR ACCELERATORS AND STORAGE RINGS  

E-print Network

BYPASS SYSTEM FOR SHUNTING OF ELECTROMAGNETS FOR ACCELERATORS AND STORAGE RINGS O. Belikov, A the coil of electromagnet. The device developed allows both recuperation of the taken energy to the main power source of the electromagnet and energy dump to a ballast load. The bypass module is remotely

Kozak, Victor R.

387

Transjugular Intrahepatic Portosystemic Shunt Placement in Patients with Cirrhosis and Concomitant Portal Vein Thrombosis  

SciTech Connect

Purpose. To determine the safety and efficacy of transjugular intrahepatic portosystemic shunt (TIPS) creation in patients with liver cirrhosis complicated by thrombosed portal vein. Methods. This study reviewed 15 cases of TIPS creation in 15 cirrhotic patients with portal vein thrombosis at our institution over an 8-year period. There were 2 women and 13 men with a mean age of 53 years. Indications were refractory ascites, variceal hemorrhage, and refractory pleural effusion. Clinical follow-up was performed in all patients. Results. The technical success rate was 75% (3/4) in patients with chronic portal vein thrombosis associated with cavernomatous transformation and 91% (10/11) in patients with acute thrombosis or partial thrombosis, giving an overall success rate of 87%. Complications included postprocedural encephalopathy and localized hematoma at the access site. In patients with successful shunt placement, the total follow-up time was 223 months. The 30-day mortality rate was 13%. Two patients underwent liver transplantation at 35 days and 7 months, respectively, after TIPS insertion. One patient had an occluded shunt at 4 months with an unsuccessful revision. The remaining patients had functioning shunts at follow-up. Conclusion. TIPS creation in thrombosed portal vein is possible and might be a treatment option in certain patients.

Ha, Thuong G. Van, E-mail: tgvanha@radiology.bsd.uchicago.edu; Hodge, Justin; Funaki, Brian; Lorenz, Jonathan; Rosenblum, Jordan; Straus, Christopher; Leef, Jeff [University of Chicago, Department of Radiology, Section of Interventional Radiology (United States)

2006-10-15

388

Cerebrospinal fluid shunt placement in the pediatric population: a model of hospitalization cost.  

PubMed

Object There have been no large-scale analyses on cost drivers in CSF shunt surgery for the treatment of pediatric hydrocephalus. The objective of this study was to develop a cost model for hospitalization costs in pediatric CSF shunt surgery and to examine risk factors for increased costs. Methods Data were extracted from the Kids' Inpatient Database (KID) of the Healthcare Cost and Utilization Project. Children with initial CSF shunt placement in the 2009 KID were examined. Patient charge was converted to cost using a cost-to-charge ratio. The factors associated with costs of CSF shunt hospitalizations were examined, including patient demographics, hospital characteristics, and clinical data. The natural log transformation of cost per inpatient day (CoPID) was analyzed. Three multivariate linear regression models were used to characterize the cost. Variance inflation factor was used to identify multicollinearity for each model. Results A total of 2519 patients met the inclusion criteria and were included in study. Average cost and length of stay (LOS) for initial shunt placement were $49,317 ± $74,483 (US) and 18.2 ± 28.5 days, respectively. Cost per inpatient day was $4249 ± $2837 (median $3397, range $80-$22,263). The average number of registered nurse (RN) full-time equivalents (FTEs) per 1000 adjusted inpatient days was 5.8 (range 1.6-10.8). The final model had the highest adjusted coefficient of determination (R(2) = 0.32) and was determined to be the best among 3 models. The final model showed that child age, hydrocephalus etiology, weekend admission, number of chronic diseases, hospital type, number of RN FTEs per 1000 adjusted inpatient days, number of procedures, race, insurance type, income level, and hospital regions were associated with CoPID. Conclusions A patient's socioeconomic status, such as race, income level, and insurance, in addition to hospitalrelated factors such as number of hospital RN FTEs, hospital type, and US region, could affect the costs of initial CSF shunt placement, in addition to clinical factors such as hydrocephalus origin and LOS. To create a cost model of initial CSF shunt placement in the pediatric population, consideration of such nonclinical factors may be warranted. PMID:25363433

Lam, Sandi K; Srinivasan, Visish M; Luerssen, Thomas G; Pan, I-Wen

2014-11-01

389

Piezoelectric Shunt Vibration Damping of F-15 Panel under High Acoustic Excitation  

NASA Technical Reports Server (NTRS)

At last year's SPIE symposium, we reported results of an experiment on structural vibration damping of an F-15 underbelly panel using piezoelectric shunting with five bonded PZT transducers. The panel vibration was induced with an acoustic speaker at an overall sound pressure level (OASPL) of about 90 dB. Amplitude reductions of 13.45 and 10.72 dB were achieved for the first and second modes, respectively, using single- and multiple-mode shunting. It is the purpose of this investigation to extend the passive piezoelectric shunt-damping technique to control structural vibration induced at higher acoustic excitation levels, and to examine the controllability and survivability of the bonded PZT transducers at these high levels. The shunting experiment was performed with the Thermal Acoustic Fatigue Apparatus (TAFA) at the NASA Langley Research Center using the same F-15 underbelly panel. The TAFA is a progressive wave tube facility. The panel was mounted in one wall of the TAFA test section using a specially designed mounting fixture such that the panel was subjected to grazing-incidence acoustic excitation. Five PZT transducers were used with two shunt circuits designed to control the first and second modes of the structure between 200 and 400 Hz. We first determined the values of the shunt inductance and resistance at an OASPL of 130 dB. These values were maintained while we gradually increased the OASPL from 130 to 154 dB in 6-dB steps. During each increment, the frequency response function between accelerometers on the panel and the acoustic excitation measured by microphones, before and after shunting, were recorded. Good response reduction was observed up to the 148dB level. The experiment was stopped at 154 dB due to wire breakage from vibration at a transducer wire joint. The PZT transducers, however, were still bonded well on the panel and survived at this high dB level. We also observed shifting of the frequency peaks toward lower frequency when the OASPL was increased. Detailed experimental results will be presented.

Wu, Shu-Yau; Turner, Travis L.; Rizzi, Stephen A.

2000-01-01

390

65nm LP\\/GP mix low cost platform for multi-media wireless and consumer applications  

Microsoft Academic Search

A complete 65nm CMOS platform, called LP\\/GP mix, has been developed employing thick oxide transistor (1.0), low power (LP) and general purpose (GP) devices on the same chip. Dedicated to wireless multi-media and consumer applications, this new triple gate oxide platform is low cost (+mask only) and saves over 35% of dynamic power with the use of the low operating

B. Tavel; B. Duriez; R. Gwoziecki; M. T. Basso; C. Julien; C. Ortolland; Y. Laplanche; R. Fox; E. Saboure; C. Detcheverry; F. Boeuf; P. Morin; D. Barge; M. Bidaud; J. Bienacel; P. Garnier; K. Cooper; J. D. Chapon; Y. Trouille; J. Belledent; M. Broekaart; P. Gouraud; M. Denais; V. Huard; K. Rochereau; R. Difrenza; N. Planes; M. Marin; S. Boret; D. Gloria; S. Vanbergue; P. Abramowitz; L. Vishnubhotla; D. Reber; P. Stolk; M. Woo; F. Arnaud

2005-01-01

391

65 nm LP\\/GP mix low cost platform for multi-media wireless and consumer applications  

Microsoft Academic Search

A complete 65nm CMOS platform, called LP\\/GP Mix, has been developed employing thick oxide transistor (IO), Low Power (LP) and General Purpose (GP) devices on the same chip. Dedicated to wireless multi-media and consumer applications, this new triple gate oxide platform is low cost (+1mask only) and saves over 35% of dynamic power with the use of the low operating

B. Tavel; B. Duriez; R. Gwoziecki; M. T. Basso; C. Julien; C. Ortolland; Y. Laplanche; R. Fox; E. Sabouret; C. Detcheverry; F. Boeuf; P. Morin; D. Barge; M. Bidaud; J. Biénacel; P. Garnier; K. Cooper; J. D. Chapon; Y. Trouiller; J. Belledent; M. Broekaart; P. Gouraud; M. Denais; V. Huard; K. Rochereau; R. Difrenza; N. Planes; M. Marin; S. Boret; D. Gloria; S. Vanbergue; P. Abramowitz; L. Vishnubhotla; D. Reber; P. Stolk; M. Woo; F. Arnaud

2006-01-01

392

Tissue distribution of [3H]cholesteryl linoleyl ether-labeled human Lp(a) in different rat organs.  

PubMed

The sites of tissue uptake of human lipoprotein(a) (Lp(a] were studied in rats using [3H]cholesteryl linoleyl ether [( 3H]CLE) as a marker. Since rat plasma has no cholesteryl ester transfer activity, the amount of label in various tissues should reflect the quantitative uptake of Lp(a). Isolated Lp(a) was labeled with [3H]CLE by incubation overnight of Lp(a), a source of cholesteryl ester transfer activity (1.23 g/ml infranate of human plasma), and [3H]CLE-labeled Intralipid. Following labeling, the homogeneity and integrity of Lp(a) was shown by agarose electrophoresis and immunoblotting. Intact Lp(a) was injected via the tail vein of rats (120-170 g, n = 4 at each time point), and tissues were collected at various times thereafter (4-48 h). The disappearance curve of [3H]CLE-labeled Lp(a) from rat plasma was bimodal and had an initial rapid t1/2 of 1.8 h followed by a slower component, t1/2 = 13.3 h. Tissue uptake at all sampling times was greatest in liver (28.5% at 48 h of total dpm injected), followed by the intestine (9-12%), with less than 3% uptake by spleen. The small intestine was divided into four segments, and while the 3H radioactivity was similar in the proximal segments, a time-related increase in [3H]CLE was seen in its most distal portion. These studies indicate that the tissue sites of degradation in the rat of human Lp(a) are similar to human low-density lipoproteins (LDL); the increase in label in the distal portion of the small intestine with time may represent [3H]CLE excreted through the bile and absorbed by the mucosal cells. PMID:2973814

Ye, S Q; Keeling, J; Stein, O; Stein, Y; McConathy, W J

1988-12-16

393

Functional impairment of two novel mutations detected in lipoprotein-associated phospholipase A2 (Lp-PLA2) deficiency patients  

Microsoft Academic Search

Plasma lipoprotein-associated phospholipase A2 (Lp-PLA2), also known as platelet-activating factor (PAF) acetylhydrolase (PAF-AH), is a member of the serine-dependent class of A2 phospholipases that hydrolyze sn2-ester bonds of fragmented or oxidized phospholipids at sites where atherosclerotic plaques are forming. Most circulating Lp-PLA2 is bound to low-density lipoprotein (LDL) particles in plasma and the rest to high-density lipoprotein (HDL). Deficiency of

Mitsuaki Ishihara; Tadao Iwasaki; Makoto Nagano; Jun Ishii; Mayumi Takano; Takeshi Kujiraoka; Masahiro Tsuji; Hiroaki Hattori; Mitsuru Emi

2004-01-01

394

Treatment of symptomatic HyperLp(a)lipoproteinemia with LDL-apheresis: a multicentre study.  

PubMed

LDL-apheresis (LDLa) efficacy in the treatment of symptomatic HyperLp(a)lipoproteinemia -HyperLp(a)- has been studied in a multicentre trial. After 3.1+/-2.7 years of weekly and biweekly treatment, the data from 19 patients (males:12; females:7; aged 53.8+/-9.3 years; mean body mass index: 24.6+/-2.3 Kg/m²) were evaluated. Data were collected using the same questionnaire shared by 5 participating centres. A total of 2331 procedures were performed. A mean of 3593.7+/-800.3 ml of plasma or 8115.3+/-2150.1 ml of blood, depending upon the technique used (H.E.L.P., D.A.LI., Dextransulphate, Lipocollect 200), was regularly treated on average every 10.1+/-2.6 days. Baseline mean Lp(a) levels were 172.3+/-153.8 mg/dL. The mean pre-/post-apheresis Lp(a) levels decreased from 124.5+/-107.2 mg/dL (p<0.001 vs baseline) to 34.2+/-40.6 mg/dL (p<0.001 vs pre-). Baseline mean LDL-cholesterol (LDLC) levels were 152.3+/-74.6 mg/dL. The mean pre-/post-apheresis LDLC levels decreased from 130.4+/-61.1 mg/dL (p<0.004 vs baseline) to 41.2+/-25.1 mg/dL (p<0.001 vs pre-). The hypolipidemic drugs given to the patients during LDLa were: ezetimibe+simvastatin, atorvastatin, rosuvastatin, pravastatin, acipimox, and omega-3 fatty acids. 58% of the patients had arterial hypertension. Cigarette smokers were 5.3%. Alcohol intake was present in 21%. 52.6% were physically active. Patients with coronary artery disease (CAD) submitted to coronary catheterization before LDLa were 95%. In 5.5% (#1) CAD recurred despite treatment with LDLa. 79% were submitted to coronary revascularization before LDLa. CAD was: monovasal in 8 patients (42.1%), bivasal in 5 (26.4%), trivasal in 4 (21%), plurivasal in 2 (10.5%). In 94.5% of the sample the lesions were stable (< 0% deviation) over 3.1+/-2.7 years. 37% had both CAD and extra-coronary artery disease. This multicentre study confirmed that long-term treatment with LDLa was at least able to stabilize CAD in the majority of the individuals with symptomatic HyperLp(a). PMID:20129383

Stefanutti, C; D'Alessandri, G; Russi, G; De Silvestro, G; Zenti, M G; Marson, P; Belotherkovsky, D; Vivenzio, A; Di Giacomo, S

2009-12-29

395

Sonographic detection of intrapulmonary shunting of venous gas bubbles during exercise after diving in a professional diver.  

PubMed

We report a case of right-to-left intrapulmonary (IP) shunting of venous gas bubbles at a high level of exercise after diving. The diagnosis was made using a 4-chamber view of the heart via echocardiography during exercise. This case is the first in which we could find evidence of IP shunt recruitment during exercise after diving, and the bubble grade was the highest ever seen in our laboratory. Venous bubbles crossing over through IP shunts during exercise after diving is a very rare event. PMID:17676615

Obad, Ante; Palada, Ivan; Ivancev, Vladimir; Valic, Zoran; Fabijanic, Damir; Brubakk, Alf O; Dujic, Zeljko

2007-10-01

396

Two-Year Survival and Mental and Psychomotor Outcomes After the Norwood Procedure An Analysis of the Modified Blalock-Taussig Shunt and Right Ventricle-to-Pulmonary Artery Shunt Surgical Eras  

Microsoft Academic Search

Background—The Norwood procedure for stage 1 palliation of hypoplastic left heart syndrome is performed with either the modified Blalock-Taussig (MBTS) or the right ventricle-to-pulmonary artery (RVPA) shunt. In our institution, surgical practice changed from use of the MBTS to use of the RVPA shunt in 2002. We analyzed survival and mental and psychomotor outcomes of the 2 consecutive surgical eras.

Joseph Atallah; Irina A. Dinu; Ari R. Joffe; Charlene M. T. Robertson; Reg S. Sauve; John D. Dyck; David B. Ross; Ivan M. Rebeyka

2010-01-01

397

Detection of quasi-static displacement components of LP seismic sources near the volcanic summit  

NASA Astrophysics Data System (ADS)

Seismic long-period (LP) events are still not completely understood, but widely accepted source models involve fluids and fluid-driven resonance processes. Due to the difficulties related to installing seismometers in summit regions of volcanoes, the observations of volcanic seismicity are usually performed at distances not closer than 1-2 km from the hypocentre of a seismic event. Observations from high-density network experiments on different volcanoes lead to a new model proposed by Bean et al. (Nature Geoscience, January 2014). Therein LP events are explained as a consequence of a brittle-ductile failure occurring under the low-stress conditions in the shallow volcanic edifice, rather than fluid-driven resonance. One consequence of this model is a static displacement associated with these LP events. Unfortunately, the expected amplitude of the static shift is only several micrometres, i.e. not detectable by typical deformation measurements. Therefore, we try to develop methods for using seismometers as static shift detecting sensors. Our current inability to recover the full spectrum of recorded displacement results in a band-limited representation of the true process derived from moment-tensor inversions. If the actual source process is of a broadband character, our narrow-band results can be quite misleading. In this study we are focusing on quasi-static displacements we observed on seismometer data from Turrialba Volcano (Costa Rica) and Mt Etna (Italy). These appear as ramp-like signals on displacement traces of LP events, most commonly on all three seismometer components, and have a magnitude of a few micrometres. Laboratory tests confirm that the seismometers used in our field experiments can indeed measure step-like signals, but they also show that long period noise can be a problem when trying to interpret these. Normal high pass filters suitable to remove this noise cannot be applied without losing the signal we are interested in. Therefore special attention has to be paid to the processing steps preceding the interpretation of data. In order to constrain the data and test the applied methods, we compare field data and laboratory data with numerical simulations. Considering the full broadband spectrum of the recorded displacements may shed new light on the long period part of the source process.

Thun, Johannes; Bean, Christopher J.; Lokmer, Ivan

2014-05-01

398

Coagulopathy of peritoneovenous shunts: studies on the pathogenic role of ascitic fluid collagen and value of antiplatelet therapy.  

PubMed Central

The role of ascitic fluid collagen in the pathogenesis of the coagulopathy that follows peritoneovenous shunting was examined. Collagen was partially purified from ascitic fluid and infused into rabbits. All animals developed changes in their haemostatic profile consistent with intravascular coagulation. Aspirin therapy, for five days before the collagen infusion, prevented these changes. Seven patients undergoing a total of eight peritoneovenous shunts for intractable ascites received antiplatelet therapy (aspirin and dipyridamole) in the immediate pre- and postoperative period. After six shunts no thrombocytopenia or prolongation of clotting times developed to suggest decompensated consumptive coagulopathy. Complicating factors may have contributed to the deterioration in haemostasis in the other two patients. There was no early shunt occlusion. The results support the hypothesis that ascitic fluid collagen is important in the pathogenesis of intravascular coagulation postascitic fluid infusion and indicate that antiplatelet drugs may be of value in preventing this complication. PMID:6840615

Salem, H H; Dudley, F J; Merrett, A; Perkin, J; Firkin, B G

1983-01-01

399

Reversal of Transjugular Intrahepatic Portosystemic Shunt (TIPS)-Induced Hepatic Encephalopathy Using a Strictured Self-Expanding Covered Stent  

SciTech Connect

Hepatic encephalopathy is a known complication following percutaneous transjugular intrahepatic portosystemic shunt (TIPS) placement. We describe herein a simple and effective strategy of TIPS revision by creating an intraluminal stricture within a self-expanding covered stent, which is deployed in the portosystemic shunt to reduce the TIPS blood flow. This technique was successful in reversing a TIPS-induced hepatic encephalopathy in our patient.

Cox, Mitchell W. [Baylor College of Medicine, Houston, Texas, Division of Vascular Surgery and Endovascular Therapy, Michael E. DeBakey Department of Surgery (United States); Soltes, George D. [Baylor College of Medicine, Houston, Texas, Division of Interventional Radiology, Department of Radiology (United States); Lin, Peter H., E-mail: plin@bcm.tmc.edu; Bush, Ruth L.; Lumsden, Alan B. [Baylor College of Medicine, Houston, Texas, Division of Vascular Surgery and Endovascular Therapy, Michael E. DeBakey Department of Surgery (United States)

2003-11-15

400

Unsatisfactory outcomes of prolonged ischemic priapism without early surgical shunts: our clinical experience and a review of the literature  

PubMed Central

Ischemic priapism is a rare occurrence which can cause severe erectile dysfunction (ED) without timely treatment. This retrospective study reports our experience in treating prolonged ischemic priapism and proposes our further considerations. In this paper, a total of nine patients with prolonged ischemic priapism underwent one to three types of surgical shunts, including nine Winter shunts, two Al-Ghorab shunts and one Grayhack shunt. During the follow-up visit (after a mean of 21.11 months), all patients' postoperative characters were recorded, except one patient lost for death. Six postoperative patients accepted a 25-mg oral administration of sildenafil citrate. The erectile function of the patients was evaluated by their postoperative 5-item version of International Index of Erectile Function Questionnaire (IIEF-5), which were later compared with their premorbid scores. All patients had complete resolutions, and none relapsed. The resolution rate was 100%. Seven patients were resolved with Winter shunts, one with an Al-Ghorab shunt and one with a Grayhack shunt. The mean hospital stay was 8.22 days. There was only one urethral fistula, and the incidence of postoperative ED was 66.67%. Four patients with more than a 72-h duration of priapism had no response to the long-term phosphodiesterase type 5 (PDE-5) inhibitor treatment. These results suggest that surgical shunts are an efficient approach to make the penis flaccid after prolonged priapism. However, the severe ED caused by prolonged duration is irreversible, and long-term PDE-5 inhibitor treatments are ineffective. Thus, we recommend early penile prosthesis surgeries for these patients. PMID:22922321

Zheng, Da-Chao; Yao, Hai-Jun; Zhang, Ke; Xu, Ming-Xi; Chen, Qi; Chen, Yan-Bo; Cai, Zhi-Kang; Lu, Mu-Jun; Wang, Zhong

2013-01-01

401

Healthcare Savings Associated with Reduced Infection Rates Using Antimicrobial Suture Wound Closure for Cerebrospinal Fluid Shunt Procedures  

Microsoft Academic Search

Background\\/Aims\\/Methods: This is a follow-up study from a recent randomized controlled trial conducted at the Women and Children’s Hospital of Buffalo that investigated the use of antimicrobial sutures (AMS) for wound closure during cerebrospinal fluid shunting procedures. Our purpose was to determine the average cost of shunt infections at our institution and estimate the healthcare savings associated with reduced infection

Jonathan Stone; Thomas J. Gruber; Curtis J. Rozzelle

2010-01-01

402

A Novel Calibration Algorithm With Unknown Line-Series-Shunt Standards for Broadband S-Parameter Measurements  

Microsoft Academic Search

This paper presents a novel calibration algorithm using unknown line-series-shunt standards that are suitable for planar transmission line structures for the broadband S-parameter measurements of microwave vector network analyzers. The derivations are based on the eight-term error model with the matched line standard and the lumped assumptions for the series and shunt calibration kits, respectively. With the self-calibration technique, the

Chien-Chang Huang; Huan-Che Lin

2008-01-01

403

Integration of Thermal Energy Harvesting in Semi-Active Piezoelectric Shunt-Damping Systems  

NASA Astrophysics Data System (ADS)

The opportunities to energize a broad range of devices by use of energy available almost anywhere and in many forms are almost unlimited. A major advantage of energy harvesting is the manufacture of small autonomous electronic devices with no need for power supply and maintenance. Shunt damping circuits, although unfavorably affected by the size and mass of bulky coil inductors, started to base on synthetic inductors losing their passivity. In this paper we report a study of the feasibility of powering shunt damping circuits by use of thermal energy otherwise irrevocably lost from a bearing. The heat generated in the bearing is converted thermoelectrically into electric energy which is then used to power synthetic inductance circuitry. We show that the power demand of such circuit can be satisfied by use of a thermoelectric generator paired with a moderately loaded bearing.

Lubieniecki, Micha?; Uhl, Tadeusz

2014-05-01

404

Rotational and magnetic shunt permanent magnet quadrupoles with variable magnetic strength  

SciTech Connect

Next Linear Collider (NLC) and Very Large Hadron Collider (VLHC) projects suppose to use permanent magnets as bending, focusing and correcting elements. Prototypes of two permanent magnet quadrupoles with variable strength were built and successfully tested in Fermilab. Quadrupoles have 12.7 mm aperture diameter, 100 T/m gradient with an adjustment range of 0 to -20%. Special designs provide high precision magnetic center stability during strength change. SmCo5 permanent magnet bricks were used in these prototypes. Rotational quadrupole consists of four sections. Two central sections are rotated in counter directions to adjust the strength. Magnetic shunt quadrupole design provides variable shunting of the magnetic flux. The numerical simulation, designs, measuring results are described.

Vladimir Kashikhin et al.

2002-03-28

405

Tympano-nasopharyngeal shunt operation. A new method of middle ear ventilation.  

PubMed

The tympano-nasopharyngeal shunt operation is recommended as a "substitute" Eustachian tube. An experimental study regarding the efficacy of tympano-nasopharyngeal shunt operation was conducted in two dogs. Finally, four patients with complete tubal stenosis were operated on by this new method within a period of one year, with no postoperative complications. The hearing improved and patients were able to inflate their middle ears. The method is claimed to have the following advantages: permanent ventilation of the middle ear with preservation of an intact drum; the middle-ear pressure can be increased by Valsalva or Politzer manoeuvres; moderate technical difficulties; no risk of postoperative complications; and suitable in children as well as adults. The disadvantages seem to be: drainage not ensured; minor risk of ascending infection. PMID:1168236

Misurya, V K

1975-02-01

406

3D-modelling of transient left bronchial obstruction following bidirectional superior cavopulmonary shunt  

PubMed Central

Extrinsic compression of airways is one the most important causes of respiratory insufficiency in the perioperative period in children with congenital heart disease. This is especially true of pathologies that involve surgery of the aortic arch or conduit replacement of the right ventricular outflow tract. However bronchial obstruction is uncommon in the setting of bidirectional cavopulmonary shunt alone. We report the case of an infant with a functionally univentricular heart who had a bidirectional superior cavopulmonary shunt and disconnection of the main pulmonary artery from the ventricular mass with oversewing of pulmonary valve. Post-operatively the patient desaturated due to compression of left main bronchus by the left pulmonary artery anteriorly and the descending aorta posteriorly. This was clearly defined by CT based on 3D-modelling of the airways and great vessels. The child was managed conservatively by ventilator support, selective bronchial suctioning and systemic steroids with a successful outcome.

Lone, Reyaz A; Chapron, Julien; Faris, Aslam; John, Jiju; Samaan, Sandra Abou; Bhat, Akhlaque Nabi

2014-01-01

407

Options Studied for Managing Space Station Solar Array Electrical Hazards for Sequential Shunt Unit Replacement  

NASA Technical Reports Server (NTRS)

The U.S. solar array strings on the International Space Station are connected to a sequential shunt unit (SSU). The job of the SSU is to shunt, or short, the excess current from the solar array, such that just enough current is provided downstream to maintain the 160-V bus voltage while meeting the power load demand and recharging the batteries. Should an SSU fail on-orbit, it would be removed and replaced with the on-orbit spare during an astronaut space walk or extravehicular activity (EVA) (see the photograph). However, removing an SSU during an orbit Sun period with input solar array power connectors fully energized could result in substantial hardware damage and/or safety risk to the EVA astronaut. The open-circuit voltage of cold solar-array strings can exceed 320 V, and warm solar-array strings could feed a short circuit with a total current level exceeding 240 A.

Delleur, Ann M.; Kerslake, Thomas W.; Levy, Robert K.

2004-01-01

408

Comparison of Multiple Carrier Disposition PWM Techniques Applied for Multi-Level Shunt Active Filter  

NASA Astrophysics Data System (ADS)

This work presents the simulation of a shunt active filter using seven-level cascaded inverter. The ultimate objective is to bring out the influence of multiple carrier level shifted PWM techniques on the performance of a shunt active filter. Classical disposition PWM techniques such as PD, POD and APOD have been used to generate the gating signals for the inverter active switches. A comparison is presented to substantiate the effect of these techniques in filtering. The comparison is made from the perspective of reduction in THD of source currents after filtering. For compensation current extraction synchronous detection method has been used. The harmonic reduction is achieved in source currents as well as source voltages.

Kathalingam, Sebasthi Rani; Karantharaj, Porkumaran

2012-07-01

409

On-line process analysis innovation: DiComp (tm) shunting dielectric sensor technology  

NASA Technical Reports Server (NTRS)

The DiComp Shunting Dielectric Sensor (SDS) is a new patent-pending technology developed under the Small Business Innovation Research Program (SBIR) for NASA's Kennedy Space Center. The incorporation of a shunt electrode into a conventional fringing field dielectric sensor makes the SDS uniquely sensitive to changes in material dielectric properties in the KHz to MHz range which were previously detectable only at GHz measurement frequencies. The initial NASA application of the SDS for Nutrient Delivery Control has demonstrated SDS capabilities for thickness and concentration measurement of Hoagland nutrient solutions. The commercial introduction of DiComp SDS technology for concentration and percent solids measurements in dispersions, emulsions and solutions represents a new technology for process measurements for liquids in a variety of industries.

Davis, Craig R.; Waldman, Frank A.

1993-01-01

410

[Pleuro-peritoneal Shunt in a Patient with Intractable Pleural Effusion after Cardiac Surgery].  

PubMed

A 45-year-old man experienced dyspnea on effort and was hospitalized due to severe mitral valve regurgitation and atrial fibrillation. He also had alcoholic cirrhosis. After he was stabilized, mitral valve plasty and Maze procedure were performed. The postoperative clinical course was satisfactory. During the follow-up period, he began to suffer from persistent left pleural effusion, which amounted to about 2,500 to 3,000 ml, and required intercostal tube drainage weekly. Therefore a pleuro-peritoneal shunt was implanted. The pleural effusion decreased, and he obtained significant relief from dyspnea. After one year, we confirmed that pleural effusion had not reccurred, and removed the pleuro-peritoneal shunt. PMID:25292378

Tsuji, Maiko; Yamazaki, Takenori

2014-10-01

411

Factors predicing survival after portacaval shunt: a multiple linear regression analysis.  

PubMed Central

The predictive value of 15 pre- and peroperative parameters upon survival after portacaval shunt was analyzed in a retrospective investigation of 134 elective operations. A multiple linear regression model was used. Survival was measured at three different points of time: one month, one year and five years after the operation. Survival at one month was influenced by the parameters bilirubin/s and ascites only. Survival at one year was influenced by albumin/s, sex, bilirubin/s, BSP, heart disease history and ascites Survival at five years was influenced by albumin/s, alkaline phosphatase/s, history of alcohol abuse, and globulin/s. These findings indicate that prediction of survival after portacaval shunt is an intricate process and that considerable improvement of the child criteria is possible. PMID:629618

Simert, G; Persson, T; Vang, J

1978-01-01

412

The multitarget opioid ligand LP1's effects in persistent pain and in primary cell neuronal cultures.  

PubMed

Persistent pain states, such as those caused by nerve injury or inflammation, are associated with altered sensations, allodynia and hyperalgesia, that are resistant to traditional analgesics. A contribution to development and maintenance in altered pain perception comes from nociceptive processing and descending modulation from supraspinal sites. A multitarget ligand seems to be useful for pain relief with a decreased risk of adverse events and a considerable analgesic efficacy. The multitarget MOR agonist-DOR antagonist LP1, (3-[(2R,6R,11R)-8-hydroxy-6,11-dimethyl-1,4,5,6-tetrahydro-2,6-methano-3-benazocin-3(2H)-yl]-N-phenylpropanamide, is a central acting antinociceptive agent with low potential to induce tolerance. LP1 was tested in models of neuropathic pain - induced by chronic constriction injury (CCI) of the left sciatic nerve - and inflammatory pain - produced by intraplantar injection of carrageenan. In CCI rats, subcutaneous (s.c.) LP1 (3 mg/kg) showed a significant antiallodynic effect, measured with von Frey filaments, and antihyperalgesic effect, evoked in response to a radiant heat stimulus with plantar test. Analogously, LP1 significantly reduced allodynic and hyperalgesic thresholds in a model of inflammatory pain induced by carrageenan. To evaluate the contribution of opioid receptor subtypes in LP1 antinociceptive effects, the multitarget LP1 profile was assessed using selective opioid antagonists. Moreover, functional electrophysiological in vitro assays, using primary cortical and spinal cord networks, allowed to define the "pharmacological fingerprint" of LP1. The EC?? values in this functional screening seem to confirm LP1 as a potent opioid ligand (EC?? = 0.35 fM and EC?? = 44 pM in spinal cord and frontal cortex, respectively). Using a NeuroProof data-base of well characterised reference compounds, a similarity profile of LP1 to opioid and non-opioid drugs involved in pain modulation was detected. Our studies seem to support that multitarget ligand approach should be useful for persistent pain conditions in which mechanical allodynia and thermal hyperalgesia are significant components of the nociceptive response. PMID:23541722

Parenti, Carmela; Turnaturi, Rita; Aricò, Giuseppina; Gramowski-Voss, Alexandra; Schroeder, Olaf H-U; Marrazzo, Agostino; Prezzavento, Orazio; Ronsisvalle, Simone; Scoto, Giovanna M; Ronsisvalle, Giuseppe; Pasquinucci, Lorella

2013-08-01

413

Lp(a) lipoprotein, IgG, IgA and IgM antibodies to Chlamydia pneumoniae and HLA class II genotype in early coronary artery disease  

Microsoft Academic Search

The associations previously found between lipoprotein(a) (Lp(a)) levels and atherosclerotic disorders, diabetes, rheumatoid arthritis and renal diseases suggest that Lp(a) may be involved in autoimmune reactions. The relation found between Lp(a) levels and the HLA class II genotype in males with early coronary artery disease (CAD) further support that assumption. It was suggested that an autoimmune process, perhaps triggered by

Gösta H. Dahlén; Jens Boman; Lisbeth Slunga Birgander; Bertil Lindblom

1995-01-01

414

Low frequency of anti-SLA\\/LP autoantibody in Japanese adult patients with autoimmune liver diseases: analysis with recombinant antigen assay  

Microsoft Academic Search

Anti-soluble liver antigen\\/liver pancreas (SLA\\/LP) autoantibody has been proposed to be one of the autoantibodies characterizing autoimmune hepatitis (AIH). Recently, one of the autoantigens to anti-SLA\\/LP was identified as a UGA suppressor tRNA-associated protein. Although the function of this protein remains unknown, the recombinant protein has been prokaryotically expressed. Using this protein as an antigen, a recombinant immunoassay for anti-SLA\\/LP

Hiroshi Miyakawa; Yumi Kawashima; Eriko Kitazawa; Naomi Kawaguchi; Takashi Kato; Kentaro Kikuchi; Erika Imai; Hirotoshi Fujikawa; Etsuko Hashimoto; Wolfgang Schlumberger

2003-01-01

415

Salvage transjugular intrahepatic portosystemic shunt for uncontrolled variceal bleeding in patients with decompensated cirrhosis  

Microsoft Academic Search

Background\\/Aims: The place of transjugular intrahepatic porto–systemic shunt (TIPS) for variceal haemorrhage uncontrolled by sclerotherapy and medical treatment is still undefined. To investigate the outcome of early salvage TIPS for active uncontrolled variceal haemorrhage, and to identify the factors associated with mortality.Methods: Salvage TIPS was performed in 58 patients as soon as possible after the diagnosis of variceal bleeding refractory

Daniel Azoulay; Denis Castaing; Pietro Majno; Faouzi Saliba; Allaoua Smail; Valérie Delvart; Monzer Danaoui; Didier Samuel; Henri Bismuth

2001-01-01

416

Pediatric Neurosurgical Practice Patterns Designed to Prevent Cerebrospinal Fluid Shunt Infection  

Microsoft Academic Search

Background\\/Aims: Various factors have been associated with cerebrospinal fluid (CSF) shunt infection risk, leading to many recommendations intended to reduce that risk. We sought to assess current North American pediatric neurosurgical practice patterns in this regard via a web-based survey. Particular attention was paid to the use of antibiotic-impregnated materials and prophylactic perioperative antibiotics. Methods: The membership of the section

Thomas J. Gruber; Sara Riemer; Curtis J. Rozzelle

2009-01-01

417

A randomized controlled trial of perioperative rifampin\\/trimethoprim in cerebrospinal fluid shunt surgery  

Microsoft Academic Search

A randomized, double-blind, placebo-controlled trial of perioperative rifampin-trimethoprim was undertaken at the Hospital for Sick Children from March 1984 to October 1987, in which 243 patients undergoing 300 cerebrospinal fluid (CSF) shunting procedures were randomized into groups including treatment with rifampin\\/trimethoprim and placebo, and then followed for a minimum of 2 years. Patients were stratified prior to randomization into those

Beverly C. Walters; Liliana Goumnerova; Harold J. Hoffman; E. Bruce Hendrick; Robin P. Humphreys; Carey Levinton

1992-01-01

418

Three-phase four-wire shunt active filter control strategies  

Microsoft Academic Search

This paper describes a three-phase four-wire shunt active power filter using a conventional three-leg converter, without the need of power supply at DC bus. Two approaches have been developed to control the active filter. Both control strategies consider harmonics and zero sequence components in the voltage and current simultaneously. The first one provides constant power and the second one sinusoidal

M. Aredes; J. Hafner; K. Heumann

1997-01-01

419

DC-bus voltage optimum control of three-phase shunt active filter system  

Microsoft Academic Search

The aim of this paper is to identify an optimum control strategy of three-phase shunt active filters to minimize the total harmonic distortion factor of the supply current. Some design aspects starting from power that must be compensated are taken into consideration. The DC-bus capacitor operation has been simulated using Matlab-Simulink environment and the results are very interesting. It is

Alexandru Bitoleanu; Mihaela Popescu; Mircea Dobriceanu; Felicia Nastasoiu

2010-01-01

420

Globally Stable Control of Three-phase Three-wire Shunt Active Power Filters  

Microsoft Academic Search

This paper proposes a new control strategy for three-phase three-wire shunt active power filters. The idea in this strategy\\u000a is to form an energy-like Lyapunov function in terms of the active filter states and then determine the control law that makes\\u000a the time derivative of the Lyapunov function always negative for all values of the states. It is shown analytically

Hasan Kömürcügil; Osman Kükrer

2007-01-01

421

Anaesthesia for emergency ventriculo-peritoneal shunt in an adolescent with Noonan's syndrome  

PubMed Central

A 15-year-old boy with Noonan's syndrome was admitted for emergency ventriculo-peritoneal shunt. Intraoperative course was complicated by hypertensive urgency, which was effectively managed with high doses of esmolol (500 ?g/kg/min). Difficult airway was anticipated due to presence of webbed neck and facial dysmorphism. Tracheal intubation was however successfully accomplished with the aid of a bougie. This report thus highlights the unique anaesthetic problems encountered during anaesthetic management of such a case, which is worth sharing.

Samra, Tanvir; Banerjee, Neerja

2014-01-01

422

Distal splenorenal shunts for the treatment of severe thrombocytopenia from portal hypertension in children  

Microsoft Academic Search

Profound thrombocytopenia resulting from portal hypertension may exacerbate gastrointestinal bleeding, precipitate spontaneous\\u000a bleeding, preclude surgical intervention for associated disorders, and severely limit life-style because of the danger of\\u000a splenic injury. Although splenectomy can reverse the thrombocytopenia, the procedure should be avoided in children. We reviewed\\u000a our experience with distal splenorenal shunting (DSRS) in children, particularly when performed for the sole

Joel Shilyansky; Eve A. Roberts; Riccardo A. Superina

1999-01-01

423

Modifications of cardiac function in cirrhotic patients treated with transjugular intrahepatic portosystemic shunt (TIPS)  

Microsoft Academic Search

OBJECTIVE:The implantation of a transjugular intrahepatic portosystemic shunt (TIPS) has been shown to exacerbate the hyperdynamic circulation and might induce a significant cardiac overload. We investigated cardiac function before and 1, 3, 6, and 12 months after the TIPS procedure in cirrhotic patients.METHODS:Eleven patients with nonalcoholic cirrhosis were evaluated. Cardiovascular parameters were assessed by two-dimensional Doppler echocardiography.RESULTS:After TIPS, the left

Manuela Merli; Valentina Valeriano; Stefania Funaro; Adolfo Francesco Attili; Andrea Masini; Cesare Efrati; Stefano De Castro; Oliviero Riggio

2002-01-01

424

Transcatheter closure of a residual shunt after surgical repair of traumatic ventricular septal defect.  

PubMed

We report a patient with a significant residual left-to-right shunt who underwent surgical repair for traumatic VSD. This 13-year-old boy was stabbed with a pair of scissors through his heart. After initial life-saving surgery with lacerated left ventricular wall repair and VSD closure, residual VSD was noted. Six months later, we performed a successful transcatheter closure of the residual VSD with an Amplatzer muscular VSD occluder. PMID:17360060

Lee, Jae-Hwan; Park, Jae-Hyeong; Choi, Si Wan; Jeong, Jin-Ok; Gil, Hong-Ryang; Yu, Jae Hyun; Seong, In-Whan

2008-02-29

425

Effect of Prone Position on Regional Shunt, Aeration and Perfusion in Experimental Acute Lung Injury  

Microsoft Academic Search

Rationale: The prone position is used to improve gas exchange in patients with acute respiratory distress syndrome. However, the regional mechanism by which the prone position improves gas ex- change in acutely injured lungs is still incompletely defined. Methods:Weusedpositronemissiontomographyimagingof( 13 N)nitro- gen to assess the regional distribution of pulmonary shunt, aeration, perfusion, and ventilation in seven surfactant-depleted sheep in supineandpronepositions.Results:Inthesupineposition,thedorsal

Torsten Richter; Giacomo Bellani; R. Scott Harris; Marcos F. Vidal Melo; Tilo Winkler; Jose G. Venegas; Guido Musch

2005-01-01

426

Wideband RF-MEMS shunt switches with high reliability for microwave and millimeter wave applications  

Microsoft Academic Search

An ultra wideband RF-MEMS shunt switch with a PZT\\/HfO2 stacked insulator has been developed for microwave and millimeter wave applications. The both of the conjunctive dielectric constant, 80, of PZT(r=800)\\/HfO2(r=20) stack layer and a match circuit contribute to high isolation of -30 dB at ultra wideband from 1 GHz to 50 GHz frequencies. The increase of the trap density in

K. Onodera; Yi Zhang; R. Maeda

2005-01-01

427

Temporary use of peritoneovenous shunting for treatment of tense ascites following a whipple procedure  

Microsoft Academic Search

Summary Tense, nonchylous ascites following a Whipple procedure has not been reported to date. We describe the course of such a patient successfully treated by a peritoneovenous shunt. A 49-year-old male developed tense ascites following pancreaticoduodenectomy. Despite conservative measures, abdominal distension developed to the point of dyspnea and orthopnea for over a six-month period. Because the physicochemical characteristic of the

Tsuyoshi Takahashi; Akira Kakita

1995-01-01

428

Piezoelectric shunt vibration damping of F-15 panel under high acoustic excitation  

Microsoft Academic Search

At last year's SPIE symposium, we reported results of an experiment on structural vibration damping of an F-15 underbelly panel using piezoelectric shunting with five bonded PZT transducers. The panel vibration was induced with an acoustic speaker at an overall sound pressure level (OASPL) of about 90 dB. Amplitude reductions of 13.45 and 10.72 dB were achieved for the first

Shu-yau Wu; Travis L. Turner; Stephen A. Rizzi

2000-01-01

429

Piezoelectric shunt vibration damping of an F-15 panel under high-acoustic excitation  

Microsoft Academic Search

At last year's SPIE symposium, we reported results of an experiment on structural vibration damping of an F-15 underbelly panel using piezoelectric shunting with five bonded PZT transducers. The panel vibration was induced with an acoustic speaker at an overall sound pressure level (OASPL) of about 90 dB. Amplitude reductions of 13.45 and 10.72 dB were achieved for the first

Shu-Yau Wu; Travis L. Turner; Stephen A. Rizzi

2000-01-01

430

Predictors and outcomes of shunt-dependent hydrocephalus in patients with aneurysmal sub-arachnoid hemorrhage  

PubMed Central

Background Hydrocephalus following spontaneous aneurysmal sub-arachnoid hemorrhage (SAH) is often associated with unfavorable outcome. This study aimed to determine the potential risk factors and outcomes of shunt-dependent hydrocephalus in aneurysmal SAH patients but without hydrocephalus upon arrival at the hospital. Methods One hundred and sixty-eight aneurysmal SAH patients were evaluated. Using functional scores, those without hydrocephalus upon arrival at the hospital were compared to those already with hydrocephalus on admission, those who developed it during hospitalization, and those who did not develop it throughout their hospital stay. The Glasgow Coma Score, modified Fisher SAH grade, and World Federation of Neurosurgical Societies grade were determined at the emergency room. Therapeutic outcomes immediately after discharge and 18?months after were assessed using the Glasgow Outcome Score. Results Hydrocephalus accounted for 61.9% (104/168) of all episodes, including 82 with initial hydrocephalus on admission and 22 with subsequent hydrocephalus. Both the presence of intra-ventricular hemorrhage on admission and post-operative intra-cerebral hemorrhage were independently associated with shunt-dependent hydrocephalus in patients without hydrocephalus on admission. After a minimum 1.5?years of follow-up, the mean Glasgow outcome score was 3.33?±?1.40 for patients with shunt-dependent hydrocephalus and 4.21?±?1.19 for those without. Conclusions The presence of intra-ventricular hemorrhage, lower mean Glasgow Coma Scale score, and higher mean scores of the modified Fisher SAH and World Federation of Neurosurgical grading on admission imply risk of shunt-dependent hydrocephalus in patients without initial hydrocephalus. These patients have worse short- and long-term outcomes and longer hospitalization. PMID:22765765

2012-01-01

431

Favorable outcome of neonatal cerebrospinal fluid shunt-associated Candida meningitis with caspofungin.  

PubMed

Invasive Candida infections associated with medical devices are very difficult to cure without device removal. We present a case of neonatal cerebrospinal fluid shunt-associated Candida meningitis, in which removal of the device was precluded, that was successfully treated with caspofungin. Pharmacokinetic assessment of caspofungin concentrations in cerebrospinal fluid showed that exposure was adequate in the presence of a high systemic exposure. In complex cases of neonatal Candida infections involving medical devices, the addition of caspofungin might be beneficial. PMID:23439643

Jans, Jop; Brüggemann, Roger J M; Christmann, V; Verweij, Paul E; Warris, Adilia

2013-05-01

432

A Compact CMOS Face Detection Architecture Based on Shunting Inhibitory Convolutional Neural Networks  

Microsoft Academic Search

In this paper, we present a compact, low cost, real-time CMOS hardware architecture for face detection. The proposed architecture is based on a VLSI-friendly implementation of Shunting Inhibitory Convolutional Neural Networks (SICoNN). Reported experimental results show that the proposed architecture can detect faces with 93% detection accuracy at 5% false alarm rate. A VLSI Systolic architecture was considered to further

Xiaoxiao Zhang; Amine Bermak; Farid Boussaïd; Abdesselam Bouzerdoum

2008-01-01

433

Efficient training algorithms for a class of shunting inhibitory convolutional neural networks  

Microsoft Academic Search

This article presents some efficient training algorithms, based on first-order, second-order, and conjugate gradient optimization methods, for a class of convolutional neural networks (CoNNs), known as shunting inhibitory convolution neural networks. Furthermore, a new hybrid method is proposed, which is derived from the principles of Quickprop, Rprop, SuperSAB, and least squares (LS). Experimental results show that the new hybrid method

Fok Hing Chi Tivive; A. Bouzerdoum

2005-01-01

434

A case of anastomosis malposition of the Blalock-Taussig shunt diagnosed using perioperative transesophageal echocardiography monitoring.  

PubMed

The perioperative transesophageal echocardiography (TEE) is a very useful and minimal invasive monitoring not only for the cardiac anesthesia management, but also for the anesthesia management of the non-cardiac operations of the heart high risk patients. In this case report, we report a case of the urgent Blalock-Taussig shunt (BT shunt) operation for a small patient of Fallot's tetralogy with anoxic spell, which showed an atypical change of hemodynamics and SpO2 with the shunt opening. After the BT shunt anastomosis, the diastolic blood pressure decreased with the shunt opening, however, the expected rise of SpO2 was not provided. By the perioperative TEE monitoring with the single plane TEE transducer for neonate; UST-52110S (Hitachi Aloka Medical, Tokyo, Japan) with 4.5 mm in diameter, the cause of this atypical change of hemodynamics and SpO2 was diagnosed to be an accidental anastomosis malposition of the BT shunt to the right pulmonary vein and reported to the operator during the operation, and the operation was performed correctly. PMID:24046098

Yamamoto, Tomohiro; Schindler, Ehrenfried

2014-04-01

435

The power output and efficiency of a negative capacitance shunt for vibration control of a flexural system  

NASA Astrophysics Data System (ADS)

A negative capacitance shunt is a basic, analog, active circuit electrically connected to a piezoelectric transducer to control the vibrations of flexural bodies. The shunt circuit consists of a resistor and a synthetic negative capacitor to introduce a real and imaginary impedance on a vibrating mechanical system. The electrical impedance of the negative capacitance shunt modifies the effective modulus of the piezoelectric transducer to reduce the stiffness and increase the damping, which causes a decrease in amplitude of the vibrating structure to which the elements are bonded. To gain an insight into the electromechanical coupling and power output, the shunt and the electrical properties of the piezoelectric transducer are modeled using circuit modeling software. The power output of the model is validated with experimental measurements of a shunt connected to a piezoelectric transducer pair bonded to a vibrating aluminum cantilever beam. The model is used to select the passive components of the negative capacitance shunt to increase the efficiency and quantify the voltage output limit of the op-amp.

Beck, Benjamin S.; Cunefare, Kenneth A.; Collet, Manuel

2013-06-01

436

Removed shunt valves: reasons for failure and implications for valve design.  

PubMed

Most removed shunt valves are discarded with no investigation into why they had to be replaced or whether they still performed to specification. However, improvements in valve design will only occur if valves that have needed removal are examined and the reasons that they failed are determined. An in-depth study of 43 valves that were removed in this unit over a 15-month period was performed. They were submitted to a four-part study, comprising flow-pressure testing, opening and closing pressure measurement, assessment of the susceptibility to syphoning, and dismantling with internal inspection of the valve components. Overall, 81% of valves failed to meet the manufacturers' specified performance data, even though the peroperative cause of shunt failure was thought to lie outside the valve. Over 80% of valves with metallic parts were found to have accumulated debris internally, and this was thought to have impaired their performance. In contrast, only 25% of non-metallic valves contained debris, a significant difference (0.01 > p > 0.001). All of the valves had a high tendency to overdrainage. Attention is drawn to the high number of malfunctioning valves. It is recommended that a change of valve should be considered in all shunt revisions, and that future valve designs should avoid metal components. PMID:8799534

Brydon, H L; Bayston, R; Hayward, R; Harkness, W

1996-06-01

437

The adjustable systemic-pulmonary artery shunt provides precise control of flow in vivo.  

PubMed

The ratio of pulmonary:systemic blood flow (Qp:Qs) remains problematic after single ventricle reconstruction. The adjustable systemic-pulmonary artery shunt (AS) was created as a solution for this problem. Prototype ASs were created using a screw-plunger mechanism as a variable resistor. A stepper motor controls plunger displacement. Six adult dogs underwent placement of a 4-mm AS in the femoral position to test its ability to control flow. Shunts were placed as arteriovenous fistulae to simulate the continuous flow of systemic-pulmonary AS. The 3.5-mm control shunts (CS) were placed on the contralateral side. The stepper motor was rotated from fully open to 3.4 mm of plunger depression for six complete cycles. Flow in the fully open AS was 687.9 +/- 28.7 cc/min* vs. 578.7 +/- 26.8 cc/min in the CS (flow +/- standard error, *p < 0.005 vs. CS). Standard deviation of flow was similar between the AS and CS, implying hysteresis in resistor function did not contribute to flow variability. Peak torque requirement to turn the resistor was 2.4 mNm. The AS offers excellent control of flow in vivo. Control of Qp:Qs may lead to improved outcomes for single ventricle reconstructions. PMID:20051834

Douglas, William I; Moore, Karabeth B; Resig, Phillip P; Mohiuddin, M Waqar

2010-01-01

438

Portosystemic shunting in portal hypertension: evaluation with portal scintigraphy with transrectally administered I-123 IMP  

SciTech Connect

Portosystemic shunting was evaluated with rectal administration of iodine-123 iodoamphetamine (IMP) in seven patients without liver disease and 53 patients with liver cirrhosis. IMP (2-3 mCi (74-111 MBq)) was administered to the rectum through a catheter. Images of the chest and abdomen were obtained for up to 60 minutes with a scintillation camera interfaced with a computer. In all patients, images of the liver and/or lungs were observed within 5-10 minutes and became clear with time. In patients without liver disease, only liver images could be obtained, whereas the lung was visualized with or without the liver in all patients with liver cirrhosis. The portosystemic shunt index was calculated by dividing counts of lungs by counts of liver and lung. These values were significantly higher in liver cirrhosis, especially in the decompensated stage. Transrectal portal scintigraphy with IMP appears to be a useful method for noninvasive and quantitative evaluation of portosystemic shunting in portal hypertension.

Kashiwagi, T.; Azuma, M.; Ikawa, T.; Takehara, T.; Matsuda, H.; Yoshioka, H.; Mitsutani, N.; Koizumi, T.; Kimura, K.

1988-10-01

439

Role of three-dimensional echocardiography in management of acquired intracardiac shunts.  

PubMed

Gerbode defect and sinus of Valsalva aneurysm fistula are congenital and acquired forms of intracardiac shunt. The increasing prevalence of invasive, recurrent cardiovascular procedures cause tissue damage and has led to more iatrogenic and acquired cases of predominantly congenital shunt over time. We report 2 cases of acquired intracardiac fistula precisely defined by Real time three-dimensional transesophageal echocardiography (3DTEE). The first case is a 70-year-old male with Gerbode defect after second aortic valve replacement surgery due to prosthetic valve endocarditis and the other case is a 41-year-old male with sinus of Valsalva aneurysm fistula between aorta and right atrium post subclinical infective endocarditis. Advanced cardiac imaging techniques such as cardiac computerized tomography, MRI and Real time three-dimensional (3D) echocardiography help to precisely detect intracardiac fistula and provide detailed anatomic and physiologic information. The relatively low cost, lack of radiation exposure, portability and guiding characteristic make real time 3DTEE an imaging technique with arguably the most advantages. Surgical repair is the usual treatment for intracardiac shunt, and percutaneous catheter-based closure is a less invasive alternative. PMID:25039665

Taskesen, Tuncay; Goldberg, Steven L; Gill, Edward Allen

2014-09-01

440

Lp-Norm Regularization in Volumetric Imaging of Cardiac Current Sources  

PubMed Central

Advances in computer vision have substantially improved our ability to analyze the structure and mechanics of the heart. In comparison, our ability to observe and analyze cardiac electrical activities is much limited. The progress to computationally reconstruct cardiac current sources from noninvasive voltage data sensed on the body surface has been hindered by the ill-posedness and the lack of a unique solution of the reconstruction problem. Common L2- and L1-norm regularizations tend to produce a solution that is either too diffused or too scattered to reflect the complex spatial structure of current source distribution in the heart. In this work, we propose a general regularization with Lp-norm (1 < p < 2) constraint to bridge the gap and balance between an overly smeared and overly focal solution in cardiac source reconstruction. In a set of phantom experiments, we demonstrate the superiority of the proposed Lp-norm method over its L1 and L2 counterparts in imaging cardiac current sources with increasing extents. Through computer-simulated and real-data experiments, we further demonstrate the feasibility of the proposed method in imaging the complex structure of excitation wavefront, as well as current sources distributed along the postinfarction scar border. This ability to preserve the spatial structure of source distribution is important for revealing the potential disruption to the normal heart excitation. PMID:24348735

Rahimi, Azar; Xu, Jingjia; Wang, Linwei

2013-01-01

441

A reconfigurable CBP/LP active RC filter with noise-shaping technique for wireless receivers  

NASA Astrophysics Data System (ADS)

A reconfigurable complex band-pass (CBP)/low-pass (LP) active-RC filter with a noise-shaping technique for wireless receivers is presented. Its bandwidth is reconfigurable among 500 kHz, 1 MHz and 4 MHz in LP mode and 1 MHz, 2 MHz and 8 MHz in CBP mode with 3 MHz center frequency. The Op-Amps used in the filter are realized in cell arrays in order to obtain scalable power consumption among the different operation modes. Furthermore, the filter can be configured into the 1st order, 2nd order or 3rd order mode, thus achieving a flexible filtering property. The noise-shaping technique is introduced to suppress the flicker noise contribution. The filter has been implemented in 180 nm CMOS and consumes less than 3 mA in the 3rd 8 MHz-bandwidth CBP mode. The spot noise at 100 Hz can be reduced by 14.4 dB at most with the introduced noise-shaping technique.

Qiongbing, Liu; Xiaobao, Yu; Junfeng, Zhang; Yang, Xu; Baoyong, Chi

2014-09-01

442

Discovery of Radio Emission from the Brown Dwarf LP944-20  

E-print Network

Brown dwarfs are classified as objects which are not massive enough to sustain nuclear fusion of hydrogen, and are distinguished from planets by their ability to burn deuterium. Old (>10 Myr) brown dwarfs are expected to possess short-lived magnetic fields and, since they no longer generate energy from collapse and accretion, weak radio and X-ray emitting coronae. Several efforts have been undertaken in the past to detect chromospheric activity from the brown dwarf LP944-20 at X-ray and optical wavelengths, but only recently an X-ray flare from this object was detected. Here we report on the discovery of quiescent and flaring radio emission from this source, which represents the first detection of persistent radio emission from a brown dwarf, with luminosities that are several orders of magnitude larger than predicted from an empirical relation between the X-ray and radio luminosities of many stellar types. We show in the context of synchrotron emission, that LP944-20 possesses an unusually weak magnetic field in comparison to active dwarf M stars, which might explain the null results from previous optical and X-ray observations of this source, and the deviation from the empirical relations.

E. Berger; S. Ball; K. M. Becker; M. Clarke; D. A. Frail; T. A. Fukuda; I. M. Hoffman; S. R. Kulkarni; R. Mellon; E. Momjian; N. W. Murphy; S. H. Teng; T. Woodruff; B. A. Zauderer; R. T. Zavala

2001-02-16

443

TRAC-PF1/MOD1 post-test calculations of the OECD LOFT Experiment LP-SB-3  

SciTech Connect

Analysis of the small, cold leg break, OECD LOFT Experiment LP-SB-3 using the best-estimate computer code TRAC-PF1/MOD1 is presented. Descriptions of the LOFT facility and the LP-SB-3 experiment are given and development of the TRAC-PF1/MOD1 input model is detailed. The calculations performed in achieving the steady state conditions, from which the experiment was initiated, and the specification of experimental boundary conditions are outlined. Results of the TRAC-PF1/MOD1 calculation are found to be generally consistent with those reported, by members of the OECD LOFT Program Review Group, in the LP-SB-3 Comparison Report.'' Overall trends with respect to pressure histories, minimum primary system mass inventory and accumulator behaviour are reasonably well reproduced by TRAC-PF1/MOD1. 17 refs., 26 figs., 3 tabs.

Allen, E.J.; Neill, A.P. (UKAEA Atomic Energy Establishment, Winfrith (UK))

1990-04-01

444

Delayed depolarization of the cog-wheel valve and pulmonary-to-systemic shunting in alligators.  

PubMed

Alligators and other crocodilians have a cog-wheel valve located within the subpulmonary conus, and active closure of this valve during each heart beat can markedly and phasically increase resistance in the pulmonary outflow tract. If this increased resistance causes right ventricular pressure to rise above that in the systemic circuit, right ventricular blood can flow into the left aorta and systemic circulation, an event known as pulmonary-to-systemic shunting. To understand better how this valve is controlled, anaesthetized American alligators (Alligator mississippiensis) were used to examine the relationships between depolarization of the right ventricle, depolarization/contraction of the cog-wheel valve muscle and the resultant right ventricular, pulmonary artery and systemic pressures. Depolarization swept across the right ventricle from the apex towards the base (near where the cog-wheel valve muscle is located) at a velocity of 91+/-23 cm s(-1) (mean +/- S.E.M., N=3). The cog-wheel valve electrocardiogram (ECG) (and thus contraction of the valve) trailed the right ventricular ECG by 248+/-28 ms (N=3), which was equivalent to 6-35 % of a cardiac cycle. This long interval between right ventricular and valve depolarization suggests a nodal delay at the junction between the base of the right ventricle and the cog-wheel valve. The delay before valve closure determined when the abrupt secondary rise in right ventricular pressure occurred during systole and is likely to strongly influence the amount of blood entering the pulmonary artery and thus to directly control the degree of shunting. Left vagal stimulation (10-50 Hz) reduced the conduction delay between the right ventricle and cog-wheel valve by approximately 20 % and reduced the integrated cog-wheel ECG by 10-20 %. Direct application of acetylcholine (1-2 mg) also reduced the integrated cog-wheel ECG by 10-100 %; however, its effect on the conduction delay was highly variable (-40 to +60 %). When the cog-wheel valve muscle was killed by the application of ethanol, the cog-wheel ECG was absent, right ventricular and pulmonary pressures remained low and tracked one another, the secondary rise in right ventricular pressure was abolished and shunting did not occur. This study provides additional, direct evidence that phasic contraction of the cog-wheel valve muscle controls shunting, that nervous and cholinergic stimulation can alter the delay and strength of valve depolarization and that this can affect the propensity to shunt. PMID:12077160

Syme, Douglas A; Gamperl, Kurt; Jones, David R

2002-07-01

445

TRAC-PF1 MOD1 post test calculations of the OECD LOFT Experiment LP-SB-1  

SciTech Connect

Analysis of the small, hot leg break, OECD LOFT Experiment LP-SB-1. using the best-estimate'' computer code TRAC-PF1/MOD1 is presented. Descriptions of the LOFT facility and the LP-SB-1 experiment are given and development of the TRAC-PF1/MOD1 input model is detailed. The calculations performed in achieving the steady state conditions, from which the experiment was initiated, and the specification of experimental boundary conditions are outlined. 24 refs., 66 figs., 12 tabs.

Allen, E.J. (UKAEA Atomic Energy Establishment, Winfrith (UK))

1990-04-01

446

Coupled-Flow Simulation of HP-LP Turbines Has Resulted in Significant Fuel Savings  

NASA Technical Reports Server (NTRS)

Our objective was to create a high-fidelity Navier-Stokes computer simulation of the flow through the turbines of a modern high-bypass-ratio turbofan engine. The simulation would have to capture the aerodynamic interactions between closely coupled high- and low-pressure turbines. A computer simulation of the flow in the GE90 turbofan engine's high-pressure (HP) and low-pressure (LP) turbines was created at GE Aircraft Engines under contract with the NASA Glenn Research Center. The three-dimensional steady-state computer simulation was performed using Glenn's average-passage approach named APNASA. The areas upstream and downstream of each blade row mutually interact with each other during engine operation. The embedded blade row operating conditions are modeled since the average passage equations in APNASA actively include the effects of the adjacent blade rows. The turbine airfoils, platforms, and casing are actively cooled by compressor bleed air. Hot gas leaks around the tips of rotors through labyrinth seals. The flow exiting the high work HP turbines is partially transonic and, therefore, has a strong shock system in the transition region. The simulation was done using 121 processors of a Silicon Graphics Origin 2000 (NAS 02K) cluster at the NASA Ames Research Center, with a parallel efficiency of 87 percent in 15 hr. The typical average-passage analysis mesh size per blade row was 280 by 45 by 55, or approx.700,000 grid points. The total number of blade rows was 18 for a combined HP and LP turbine system including the struts in the transition duct and exit guide vane, which contain 12.6 million grid points. Design cycle turnaround time requirements ran typically from 24 to 48 hr of wall clock time. The number of iterations for convergence was 10,000 at 8.03x10(exp -5) sec/iteration/grid point (NAS O2K). Parallel processing by up to 40 processors is required to meet the design cycle time constraints. This is the first-ever flow simulation of an HP and LP turbine. In addition, it includes the struts in the transition duct and exit guide vanes.

Veres, Joseph P.

2001-01-01

447

N-butyl cyanoacrylate embolization with blood flow control of an arterioportal shunt that developed after radiofrequency ablation of hepatocellular carcinoma.  

PubMed

We present a case of a patient with rapid deterioration of esophageal varices caused by portal hypertension accompanied by a large arterioportal shunt that developed after radiofrequency ablation of hepatocellular carcinoma. We used n-butyl cyanoacrylate (NBCA) as an embolic material to achieve pinpoint embolization of the shunt, because the microcatheter tip was 2 cm away from the shunt site. Under hepatic arterial flow control using a balloon catheter, the arterioportal shunt was successfully embolized with NBCA, which caused an improvement in the esophageal varices. PMID:24643464

Sonomura, Tetsuo; Kawai, Nobuyuki; Kishi, Kazushi; Ikoma, Akira; Sanda, Hiroki; Nakata, Kouhei; Minamiguchi, Hiroki; Nakai, Motoki; Hosokawa, Seiki; Tamai, Hideyuki; Sato, Morio

2014-01-01

448

When LP is the Cure for Your Matching Woes: Approximating Stochastic Matchings  

E-print Network

Consider a random graph model where each possible edge $e$ is present independently with some probability $p_e$. We are just given these numbers $p_e$, and want to build a large/heavy matching in the randomly generated graph. However, the only way we can find out whether an edge is present or not is to query it--and if the edge is indeed present in the graph, we are forced to add it to our matching. Further, each vertex $i$ is allowed to be queried at most $t_i$ times. How should we adaptively query the edges to maximize the expected weight of the matching? We consider several matching problems in this general framework (some of which arise in kidney exchanges and online dating, and others arise in modeling online advertisements); we give LP-rounding based constant-factor approximation algorithms for these problems.

Bansal, Nikhil; Nagarajan, Viswanath; Rudra, Atri

2010-01-01

449

Low-threshold distributed feedback lasers fabricated on material grown completely by LP-MOCVD  

SciTech Connect

GaInAsP-InP distributed feedback (DFB) lasers emitting at 1.57 ..mu..m have been fabricated on material grown completely by lowpressure metalorganic chemical vapor deposition (LP-MOCVD). The CW threshold current of 60 mA and an output power of 6 mW per facet at room temperature have been obtained. The lasing wavelength lambdaL under CW operation showed a temperature coefficient (dlambdaL/dT) of 0.9 A//sup 0/C for this DFB laser over the range of 10-90/sup 0/C. A stable single longitudinal mode was maintained under high speed pulse modulation up to 500 ps, and sinusoidal modulation at 1 Ghz.

Razeghi, M.; de Cremoux, B.; Blondeau, R.; Bouley, J.P.; Duchemin, J.P.; Krakowski, M.; Papuchon, M.

1985-06-01

450

LP-VIcode: a program to compute a suite of variational chaos indicators  

E-print Network

An important point in analysing the dynamics of a given stellar or planetary system is the reliable identification of the chaotic or regular behaviour of its orbits. We introduce here the program LP-VIcode, a fully operational code which efficiently computes a suite of ten variational chaos indicators for dynamical systems in any number of dimensions. The user may choose to simultaneously compute any number of chaos indicators among the following: the Lyapunov Exponents, the Mean Exponential Growth factor of Nearby Orbits, the Slope Estimation of the largest Lyapunov Characteristic Exponent, the Smaller ALignment Index, the Generalized ALignment Index, the Fast Lyapunov Indicator, the Othogonal Fast Lyapunov Indicator, the dynamical Spectra of Stretching Numbers, the Spectral Distance, and the Relative Lyapunov Indicator. They are combined in an efficient way, allowing the sharing of differential equations whenever this is possible, and the individual stopping of their computation when any of them saturates.

D. D. Carpintero; N. P. Maffione; L. A. Darriba

2014-04-08

451

77 FR 5613 - C3 Capital Partners II, L.P.; Notice Seeking Exemption Under 312 of the Small Business Investment...  

Federal Register 2010, 2011, 2012, 2013

...Regulations because C3 Capital Partners, L.P., an Associate of C3 Capital Partners II, L.P., currently owns greater...considered an Associate of C3 Capital Partners II as defined in Sec. 105.50...2-2-12; 8:45 am] BILLING CODE...

2012-02-03

452

copyright 2004 Bruce A. McCarl and Thomas H. Spreen 1 CHAPTER III SOLUTION OF LP PROBLEMS: A MATRIX ALGEBRA APPROACH 2  

E-print Network

ALGEBRA APPROACH 2 3.1 Matrix Formulation of the Linear Programming Problem 2 3.2 Solving LP's by Matrix Algebra 3 3.2.1 The Simplex Algorithm 6 3.2.2 Example 7 3.3 Solutions and Their Interpretation 9 3Carl and Thomas H. Spreen 2 CHAPTER III SOLUTION OF LP PROBLEMS: A MATRIX ALGEBRA APPROACH Linear programming

McCarl, Bruce A.

453

Feasibility of pulmonary artery pressure measurements in infants through aorto-pulmonary shunts using a micromanometer pressure wire.  

PubMed

Assessment of pulmonary artery pressure is an essential element in the evaluation of children palliated with surgical aorto-pulmonary shunts prior to definitive surgical repair. We report the ease of use and accuracy of a 0.014 inch micromanometer pressure wire for the measurement of pulmonary artery pressures in children with aorto-pulmonary artery shunts. The study population consisted of 11 infants and children with either a 3.5 mm modified Blalock-Taussig shunt from the subclavian artery to the branch pulmonary artery after stage 1 Norwood repair for hypoplastic left heart syndrome or palliative staged repair for tetralogy of Fallot, or a central shunt for pulmonary atresia or double outlet right ventricle. The unique features of the micromanometer pressure wire allowed rapid access and accurate measurement of pulmonary pressures in all patients studied. We conclude that the micromanometer pressure wire is a unique and accurate alternative device for rapid and safe determinations of pulmonary artery pressures in children with aorto-pulmonary artery shunts. PMID:12360387

Everett, A D; Matherne, G P

2003-01-01

454

Translation of cIAP2 mRNA Is Mediated Exclusively by a Stress-Modulated Ribosome Shunt?  

PubMed Central

During cellular stress, translation persists or increases for a number of stress-responsive proteins, including cellular inhibitor of apoptosis 2 (cIAP2). The cIAP2 transcript includes a very long (2.78-kb) 5? untranslated region (UTR) with an unusually high number of upstream AUGs (uAUGs), i.e., 64, and a stable predicted secondary structure (?G ? ?620 kcal/mol) that should completely block conventional scanning-dependent translation initiation. This region did not facilitate internal ribosome entry in vitro or when RNA reporter transcripts were transfected into cells. However, several structural features within the cIAP2 5? UTR were observed to be nearly identical to those required for ribosome shunting in cauliflower mosaic virus RNA and are well conserved in cIAP2 orthologs. Selective mutation revealed that the cIAP2 mRNA mediates translation exclusively via ribosome shunting that bypasses 62 uAUGs. In addition, shunting efficiency was altered by stress and was greatly facilitated by a conserved RNA folding domain (1,470 to 1,877 nucleotides upstream) in a region not scanned by shunting ribosomes. This arrangement suggests that regulation of cIAP2 shunting may involve recruitment of RNA binding proteins to modulate the efficiency of translation initiation. PMID:18195037

Sherrill, Kyle W.; Lloyd, Richard E.

2008-01-01

455

Molecular dissection of the prototype foamy virus (PFV) RNA 5?-UTR identifies essential elements of a ribosomal shunt  

PubMed Central

The prototype foamy virus (PFV) is a nonpathogenic retrovirus that shows promise as a vector for gene transfer. The PFV (pre)genomic RNA starts with a long complex leader that can be folded into an elongated hairpin, suggesting an alternative strategy to cap-dependent linear scanning for translation initiation of the downstream GAG open reading frame (ORF). We found that the PFV leader carries several short ORFs (sORFs), with the three 5?-proximal sORFs located upstream of a structural element. Scanning-inhibitory hairpin insertion analysis suggested a ribosomal shunt mechanism, whereby ribosomes start scanning at the leader 5?-end and initiate at the downstream ORF via bypass of the central leader regions, which are inhibitory for scanning. We show that the efficiency of shunting depends strongly on the stability of the structural element located downstream of either sORFs A/A? or sORF B, and on the translation event at the corresponding 5?-proximal sORF. The PFV shunting strategy mirrors that of Cauliflower mosaic virus in plants; however, in mammals shunting can operate in the presence of a less stable structural element, although it is greatly improved by increasing the number of base pairings. At least one shunt configuration was found in primate FV (pre)genomic RNAs. PMID:19638424

Schepetilnikov, Mikhail; Schott, Gregory; Katsarou, Konstantina; Thiebeauld, Odon; Keller, Mario; Ryabova, Lyubov A.

2009-01-01

456

Farm Fuel Safety Accidents in the handling, use and storage of gasoline, gasohol, diesel fuel, LP-gas and  

E-print Network

112 Farm Fuel Safety Accidents in the handling, use and storage of gasoline, gasohol, diesel fuel and by keeping fuel storage facilities in top condition. Flammable Liquids and Gases Gasoline, diesel fuel, LP risk to life and property, the requirements of NFPA 30 & 321, OAR 473-004-0720 and OSHA Standard 1910

457

75 FR 79312 - Special Conditions: Eurocopter France (ECF) Model EC225LP Helicopter, Installation of a Search...  

Federal Register 2010, 2011, 2012, 2013

This document proposes amended special conditions for the ECF model EC225LP helicopter. This helicopter, as modified by ECF, will have novel or unusual design features associated with installing an optional SAR AFCS. Special conditions No. 29-022-SC, published in the Federal Register on November 6, 2008 (73 FR 65968), addressed these issues. The proposed amendment revises the original final......

2010-12-20

458

Multi-Reservoir Operation Planning Using Hybrid Genetic Algorithm and Linear Programming (GA-LP): An Alternative Stochastic Approach  

Microsoft Academic Search

Many models have been suggested to deal with the multi-reservoir operation planning stochastic optimization problem involving decisions on water releases from various reservoirs in different time periods of the year. A new approach using genetic algorithm (GA) and linear programming (LP) is proposed here to determine operational decisions for reservoirs of a hydro system throughout a planning period, with the

L. F. R. Reis; G. A. Walters; D. Savic; F. H. Chaudhry

2005-01-01

459

Esterase LpEst1 from Lactobacillus plantarum: A Novel and Atypical Member of the ?? Hydrolase Superfamily of Enzymes  

PubMed Central

The genome of the lactic acid bacterium Lactobacillus plantarum WCFS1 reveals the presence of a rich repertoire of esterases and lipases highlighting their important role in cellular metabolism. Among them is the carboxylesterase LpEst1 a bacterial enzyme related to the mammalian hormone-sensitive lipase, which is known to play a central role in energy homeostasis. In this study, the crystal structure of LpEst1 has been determined at 2.05 Å resolution; it exhibits an ??-hydrolase fold, consisting of a central ?-sheet surrounded by ?-helices, endowed with novel topological features. The structure reveals a dimeric assembly not comparable with any other enzyme from the bacterial hormone-sensitive lipase family, probably echoing the specific structural features of the participating subunits. Biophysical studies including analytical gel filtration and ultracentrifugation support the dimeric nature of LpEst1. Structural and mutational analyses of the substrate-binding pocket and active site together with biochemical studies provided insights for understanding the substrate profile of LpEst1 and suggested for the first time the conserved Asp173, which is adjacent to the nucleophile, as a key element in the stabilization of the loop where the oxyanion hole resides. PMID:24663330

Cortes-Cabrera, Alvaro; Gago, Federico; Acebron, Ivan; Benavente, Rocio; Mardo, Karin; de las Rivas, Blanca; Munoz, Rosario; Mancheno, Jose M.

2014-01-01

460

75 FR 5634 - Ironwood Mezzanine Fund II, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...Business Investment Act, Conflicts of Interest Notice is hereby given that Ironwood Mezzanine Fund II, L.P. 200 Fisher Drive, Avon, CT 06001-3723, a Federal Licensee under the Small Business Investment Act of 1958, as amended (``the Act''),...

2010-02-03

461

76 FR 9808 - U.S. Customs and Border Protection Accreditation and Approval of Saybolt LP, as a Commercial...  

Federal Register 2010, 2011, 2012, 2013

...SUMMARY: Notice is hereby given that, pursuant to 19 CFR 151.12 and 19 CFR 151.13, Saybolt LP, 4871 Sunrise Dr., suite102, Martinez, CA 94553, has been approved to gauge and accredited to test petroleum and petroleum...

2011-02-22

462

From Primal-Dual to Cost Shares and Back: A Stronger LP Relaxation for the Steiner Forest Problem  

E-print Network

From Primal-Dual to Cost Shares and Back: A Stronger LP Relaxation for the Steiner Forest Problem a game theoretical variant of the Steiner forest problem. An instance of this game consists, The Netherlands. Email: s.h.m.v.zwam@student.tue.nl. #12;1 Introduction The Steiner forest problem. In the Steiner

Könemann, Jochen

463

Is it worth closing the atrial septal defect in patients with insignificant shunt?  

PubMed Central

Introduction Closure of the atrial septal defect in patients with insignificant shunt is controversial. Aim To evaluate the outcomes of transcatheter closure of atrial septal defect (ASD) in symptomatic patients with borderline shunt. Material and methods One hundred and sixty patients (120 female, 40 male) with a mean age of 30.1 ±16.2 (20–52) years with a small ASD who underwent transcatheter closure were analyzed. All patients had a small ASD with Qp: Qs ratio ? 1.5, mean 1.2 ±0.9 (1.1–1.5) in echo examination. Cardiopulmonary exercise tests, clinical study, transthoracic echocardiographic study as well as quality of life (QoL) (measured using the SF36 questionnaire (SF36q)) were repeated in all patients before and after the procedure. Results The devices were successfully implanted in all patients. After 12 months of ASD closure, all the patients showed a significant improvement of exercise capacity (oxygen consumption – 21.9 ±3.1 vs. 30.4 ±7.7, p > 0.001). The QoL improved in 7 parameters at 12-month follow-up. The mean SF36q scale increased significantly in 141 (88.1%) patients of mean 43.2 ±20.1 (7–69). A significant decrease of the right ventricular area (20.3 ±1.3 cm2 vs. 18.3 ±1.2 cm2, p < 0.001) and the right atrial area (15.2 ±1.9 cm2 vs. 12.0 ±1.6 cm2, p < 0.001) was observed at 12-month follow-up. Conclusions Closure of ASD in the patients with insignificant shunt resulted in significant durable clinical and hemodynamic improvement after percutaneous treatment. PMID:25061452

Przewlocki, Tadeusz; Olszowska, Maria; Sobien, Bartosz; Tomkiewicz-Pajak, Lidia; Podolec, Piotr

2014-01-01

464

Functional Changes of Diaphragm Type Shunt Valves Induced by Pressure Pulsation  

NASA Astrophysics Data System (ADS)

Shunt valves used to treat patients with hydrocephalus were tested to investigate influence of pressure pulsation on their flow control characteristics. Our focus was on flow dynamic and functional changes of the small and thin diaphragms in the valves that serve as the main flow control mechanism and are made from silicone elastomer. Firstly, pressure-flow control curves were compared under pulsed and steady flow (without pulsation) conditions. Secondly, functional changes of the valves were tested after a long-term continuous pulsation with a peristaltic pump. Thirdly, flushing procedures selectively conducted by neurosurgeons were simulated with a fingertip pressed on the dome of the valves. As 20cc/hr of flow rate was adjusted at a constant pressure, application of 40mmH2O of pressure pulse increased flow rate through shunt valves more than 60%. As a 90cm length silicone catheter was connected to the valve outlet, increase in the flow rate was substantially reduced to 17.5%. Pressure-flow control characteristics of some valves showed significant changes after twenty-eight days of pressure pulsation at 1.0 Hz under 50.0cc/hr of flow rate. Flushing simulation resulted in temporary decrease in the pressure level. It took three hours to fully recover the normal pressure-flow control characteristics after the flushing. Our results suggest that shunt valves with a thin elastic diaphragm as the main flow control mechanism are sensitive to intracranial pressure pulsation or pressure spikes enough to change their pressure-flow control characteristics.

Lee, Chong-Sun; Suh, Chang-Min; Ra, Young-Shin

465

Ks- and Lp-band polarimetry on stellar and bow-shock sources in the Galactic center  

NASA Astrophysics Data System (ADS)

Context. Infrared observations of the Galactic center (GC) provide a unique opportunity to study stellar and bow-shock polarization effects in a dusty environment. Aims: The goals of this work are to present new Ks- and Lp-band polarimetry on an unprecedented number of sources in the central parsec of the GC, thereby expanding our previous results in the H- and Ks-bands. Methods: We use AO-assisted Ks- and Lp-band observations, obtained at the ESO VLT. High precision photometry and the new polarimetric calibration method for NACO allow us to map the polarization in a region of 8'' × 25'' (Ks) resp. 26'' × 28'' (Lp). These are the first polarimetric observations of the GC in the Lp-band in 30 years, with vastly improved spatial resolution compared to previous results. This allows resolved polarimetry on bright bow-shock sources in this area for the first time at this wavelength. Results: We find foreground polarization to be largely parallel to the Galactic plane (Ks-band: 6.1% at 20°, Lp-band: 4.5% at 20°), in good agreement with our previous findings and with older results. The previously described Lp-band excess in the foregound polarization towards the GC could be confirmed here for a much larger number of sources. The bow-shock sources contained in the FOV seem to show a different relation between the polarization in the observed wavelength bands than what was determined for the foreground. This points to the different relevant polarization mechanisms. The resolved polarization patterns of IRS 5 and 10W match the findings we presented earlier for IRS 1W. Additionally, intrinsic Lp-band polarization was measured for IRS 1W and 21, as well as for other, less prominent mid-infrared-excess sources (IRS 2S, 2L, 5NE). The new data offer support for the presumed bow-shock nature of several of these sources (1W, 5, 5NE, 10W, 21) and for the model of bow-shock polarization presented in our last work. Tables 1 and 2 are available in electronic form at http://www.aanda.orgA table containing the polarization parameters of the sources examined here is only available in electronic form at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/557/A82

Buchholz, R. M.; Witzel, G.; Schödel, R.; Eckart, A.

2013-09-01

466

Method of making an ion beam sputter-etched ventricular catheter for hydrocephalus shunt  

NASA Technical Reports Server (NTRS)

The centricular catheter comprises a multiplicity of inlet microtubules. Each microtubule has both a large opening at its inlet end and a multiplicity of microscopic openings along its lateral surfaces. The microtubules are perforated by an ion beam sputter etch technique. The holes are etched in each microtubule by directing an ion beam through an electro formed mesh mask producing perforations having diameters ranging from about 14 microns to about 150 microns. This structure assures a reliable means for shunting cerebrospinal fluid from the cerebral ventricles to selected areas of the body.

Banks, B. A. (inventor)

1984-01-01

467

Finite Ground Coplanar Waveguide Shunt MEMS Switches for Switched Line Phase Shifters  

NASA Technical Reports Server (NTRS)

Switches with low insertion loss and high isolation are required for switched line phase shifters and the transmit/receive switch at the front end of communication systems. A Finite Ground Coplanar (FGC) waveguide capacitive, shunt MEMS switch has been implemented on high resistivity Si. The switch has demonstrated an insertion loss of less than 0.3 dB and a return loss greater than 15 dB from 10 to 20, GHz. The switch design, fabrication, and characteristics are presented.

Ponchak, George E.; Simons, Rainee N.; Scardelletti, Maximillian; Varaljay, Nicholas C.

2000-01-01

468

A comprehensive theoretical and experimental study of coplanar waveguide shunt stubs  

NASA Technical Reports Server (NTRS)

A comprehensive theoretical and experimental study of straight and bent coplanar waveguide (CPW) shunt stubs is presented. In the theoretical analysis, the CPW is assumed to be inside a cavity, while, the experiments are performed on open structures. A hybrid technique was developed to analyze the CPW discontinuities which proved to be accurate since the theoretical and experimental results agree very well. The effect of the cavity resonances on the behavior of the stubs with and without air-bridges is investigated. In addition, the encountered radiation loss due to the discontinuities is evaluated experimentally.

Dib, Nihad I.; Ponchak, George E.; Katehi, Linda P. B.

1993-01-01

469

Impact of mesocaval shunt on safe minimal liver remnant: Porcine model  

PubMed Central

AIM: To investigate the capacity of shunts to relieve portal hypertension and decrease the safe minimal liver remnant in pigs. METHODS: A subtotal hepatectomy with < 60 mL blood loss and without hepatic pedicle occlusion was performed. The mesenteric venous inflow was diverted through a mesocaval shunt (MCS) constructed using the prepared left renal vein with an end-to-side running suture of 5-0 proline. All 21 animals that underwent subtotal hepatectomy and/or MCS were divided into three groups. In the 15% group, the residual volume was 14%-19% of total liver volume (TLV); in the 15%+ S group, the residual volume was also 14%-19% of TLV with a mesocaval shunt (MCS); and in the 10%+ S group, the residual volume was 8%-13% of TLV with an MCS. In the three groups, the intraoperative portal vein pressure (PVP) and portal vein flow (PVF) were monitored and compared at laparotomy and 1 h post-hepatectomy. The survival rate, sinusoidal endothelial damage, tissue analysis, and serum analysis were investigated among the three groups. RESULTS: The percentage residual liver volume was 15.9%, 16.1% and 11.8% in the 15%, 15%+ S, 10%+ S groups, respectively. After hepatectomy, PVF and portal-to-arterial flow ratio in the 15%+ S group significantly decreased and hepatic artery flow (HAF) per unit volume significantly increased, compared to those in the 15% group. The PVP in the 15%+ S group and 10%+ S group increased slightly from that measured at laparotomy; however, in