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1

Percutaneous Access via the Recanalized Paraumbilical Vein for Varix Embolization in Seven Patients  

PubMed Central

Objective To evaluate the feasibility of percutaneous access via the recanalized paraumbilical vein for varix embolization. Materials and Methods Between July 2008 and Jan 2014, percutaneous access via the recanalized paraumbilical vein for varix embolization was attempted in seven patients with variceal bleeding. Paraumbilical vein puncture was performed under ultrasonographic guidance, followed by introduction of a 5-Fr sheath. We retrospectively evaluated the technical feasibility, procedure-related complications, and clinical outcomes of each patient. Results Recanalized paraumbilical vein catheterization was performed successfully in all patients. Gastroesophageal varix embolization was performed in six patients, and umbilical varix embolization was performed in one patient. Embolic materials used are N-butyl cyanoacrylate (n = 6) and coil with N-butyl cyanoacrylate (n = 1). There were no procedure-related complications. One patient underwent repeated variceal embolization 6 hours after initial procedure via recanalized paraumbilical vein, due to rebleeding from gastric varix. Conclusion Percutaneous access via the paraumbilical vein for varix embolization is a simple alternative in patients with portal hypertension. PMID:25246824

Cho, Yeon Jin; Kim, Young Whan; Hur, Saebeom; Jae, Hwan Jun; Chung, Jin Wook

2014-01-01

2

Stent Recanalization of Chronic Portal Vein Occlusion in a Child  

SciTech Connect

An 8-year-old boy with a 21/2 year history of portal hypertension and repeated bleedings from esophageal varices, was referred for treatment. The 3.5-cm-long occlusion of the portal vein was passed and the channel created was stabilized with a balloon-expandable stent; a portosystemic stent-shunt was also created. The portosystemic shunt closed spontaneously within 1 month, while the recanalized segment of the portal vein remained open. The pressure gradient between the intrahepatic and extrahepatic portal vein branches dropped from 17 mmHg to 0 mmHg. The pressure in the portal vein dropped from 30 mmHg to 17 mmHg and the bleedings stopped. The next dilation of the stent was performed 12 months later due to an increased pressure gradient; the gastroesophageal varices disappeared completely. Further dilation of the stent was planned after 2, 4, and 6 years.

Cwikiel, Wojciech [Department of Diagnostic Radiology, University Hospital, S-221 85 Lund (Sweden); Solvig, Jan [Department of Diagnostic Radiology, University Hospital, Skejby, DK-8200 Aarhus (Denmark); Schroder, Henrik [Department of Pediatric Medicine, University Hospital, Skejby, DK-8200 Aarhus (Denmark)

2000-07-15

3

Sharp Recanalization for Chronic Left Iliac Vein Occlusion  

SciTech Connect

Endovascular treatment has emerged as a first-line treatment for venous occlusions, but is sometimes challenging with conventional approaches. This article describes a helpful technique using a Roesch-Uchida needle to cross a chronic occlusion of the iliac vein when conventional techniques have failed.

Ito, Nobutake, E-mail: nobutake@rad.med.keio.ac.jp; Isfort, Peter; Penzkofer, Tobias [RWTH Aachen University, Department of Diagnostic and Interventional Radiology, University Hospital (Germany); Grommes, Jochen; Greiner, Andreas [RWTH Aachen University, Department of Vascular Surgery, University Hospital (Germany); Mahnken, Andreas [RWTH Aachen University, Department of Diagnostic and Interventional Radiology, University Hospital (Germany)

2012-08-15

4

Recanalization of an Occluded Infrainguinal Vein Graft Complicated by Graft Aneurysm  

SciTech Connect

The technique of subintimal angioplasty has been described for the recanalisation of native vessels after occlusion of infrainguinal vascular bypass grafts. We report a case in which an attempt at such treatment resulted in inadvertent but successful recanalisation of the occluded vein graft instead. This was complicated by graft perforation and subsequent graft aneurysm which was successfully treated with a covered stent.

Kakani, Nirmal; Travis, Simon; Hancock, John [Royal Cornwall Hospital, Department of Clinical Imaging (United Kingdom)], E-mail: John.Hancock@rcht.cornwall.nhs.uk

2007-11-15

5

Endovenous laser with miniphlebectomy for treatment of varicose veins and effect of different levels of laser energy on recanalization. A single center experience.  

PubMed

Varicose veins, associated with great saphenous vein (GSV) incompetence, are traditionally treated with conventional surgery. In recent years, minimally invasive alternatives to surgical treatment such as the endovenous laser ablation (EVLA) and radiofrequency (RF) ablation have been developed with promising results. Residual varicose veins following EVLA, regress untouched, or phlebectomy or foam sclerotherapy can be concomitantly performed. The aim of the present study was to investigate the safety and efficacy of EVLA with different levels of laser energy in patients with varicose veins secondary to saphenous vein reflux. From February 2006 to August 2011, 740 EVLA, usually with concomitant miniphlebectomies, were performed in 552 patients. A total of 665 GSV, 53 small saphenous veins (SSV), and 22 both GSV and SSV were treated with EVLA under duplex USG. At 84 patients, bilateral intervention is made. In addition, miniphlebectomy was performed in 540 patients. A duplex ultrasound (US) is performed to patients preoccupying chronic venous insufficiency (with visible varicose veins, ankle edema, skin changes, or ulcer). Saphenous vein incompetence was diagnosed with saphenofemoral, saphenopopliteal, or truncal vein reflux in response to manual compression and release with patient standing. The procedures were performed under local anesthesia with light sedation or spinal anesthesia. Endovenous 980-nm diode laser source was used at a continuous mode. The mean energy applied per length of GSV during the treatment was 77.5?±?17.0 J (range 60-100 J/cm). An US evaluation was performed at first week of the procedure. Follow-up evaluation and duplex US scanning were performed at 1 and 6 months, and at 1 and 2 years to assess treatment efficacy and adverse reactions. Average follow-up period was 32?±?4 months (3-55 months). There were one patient with infection and two patients with thrombus extension into the femoral vein after EVLA. Overall occlusion rate was 95 %. No post-procedural deep venous thrombosis or pulmonary embolism occurred. Laser energy, less than 80 J/cm, was significantly associated with increased recanalization of saphenous vein, among the other energy levels. EVLA seems a good alternative to surgery by the application of energy of not less than 80 J/cm. It is both safe and effective. It is a well-tolerated procedure with rare and relatively minor complications. PMID:24993399

Golbasi, Ilhan; Turkay, Cengiz; Erbasan, Ozan; Kemalo?lu, Cemal; Sanli, Suat; Turkay, Mehtap; Bayezid, Omer

2014-07-01

6

Treatment of an Unusual Complication of Endovenous Laser Therapy: Multiple Small Arteriovenous Fistulas Causing Complete Recanalization  

SciTech Connect

A 67-year-old woman was admitted to our institution with pain, night cramping, and visible varicose veins on her left leg. Doppler ultrasonography revealed continuous reflux in the great saphenous vein when the patient did the Valsalva maneuver. Endovenous laser therapy was applied to the great saphenous vein. Doppler ultrasonography 7 days later showed recanalization of, and arterialized flow in, the great saphenous vein. There also were small arterial vessels adjunct to the recanalized side. A left femoral angiography via a right femoral approach showed multiple small arteriovenous fistulas between superficial femoral artery muscle branches and the great saphenous vein. A second endovenous laser treatment was done at 80 J/cm, but the recanalization persisted. We offered to treat this endovascularly, but the patient preferred a surgical option. To the best of our knowledge, this is the first report of the demonstration of such a complication with endovenous laser therapy.

Yildirim, Erkan, E-mail: drerkany@yahoo.co [Baskent University Medical School, Department of Radiology (Turkey); Saba, Tonguc, E-mail: sabatonguc@hotmail.com; Ozulku, Mehmet, E-mail: sozulkum@yahoo.co [Baskent University, Department of Cardiovascular Surgery (Turkey); Harman, Ali, E-mail: aliharman75@yahoo.com.tr; Aytekin, Cuneyt, E-mail: cuneytaytekin@hotmail.com; Boyvat, Fatih, E-mail: boyvatf@yahoo.co [Baskent University, Department of Radiology (Turkey)

2009-01-15

7

Intrahepatic collateral recanalization in symptomatic Budd-Chiari syndrome: a single-center experience.  

PubMed

The authors present a single-institutional experience with intrahepatic collateral vessel recanalization as a treatment option in symptomatic Budd-Chiari syndrome (BCS). Over a period of 26 months, this procedure was performed in four symptomatic patients in whom standard hepatic vein recanalization was not feasible or had failed, with a follow-up duration ranging from 7 to 44 months. Based on these cases, intrahepatic collateral vessel recanalization is a promising treatment option in suitable patients with symptomatic BCS and is deserving of further study. PMID:20537910

Mammen, Thomas; Keshava, Shyamkumar; Eapen, C E; Moses, Vinu; Babu, N R S Surendra; Kurien, George; Chandy, George

2010-07-01

8

Sharp Central Venous Recanalization by Means of a TIPS Needle  

SciTech Connect

The purpose of this study was to perform an alternative technique for recanalization of a chronic occlusion of the left brachiocephalic vein that could not be traversed with a guidewire. Restoration of a completely thrombosed left brachiocephalic vein was attempted in a 76-year-old male hemodialysis patient with massive upper inflow obstruction, massive edema of the face, neck, shoulder, and arm, and occlusion of the stented right brachiocephalic vein/superior vena cava. Vessel negotiation with several guidewires and multipurpose catheters proved unsuccessful. The procedure was also non-viable using a long, 21G puncture needle. Puncture of the superior vena cava (SVC) at the distal circumference of the stent in the right brachiocephalic vein/superior vena cava, however, was feasible with a transjugular intrahepatic portosystemic shunt (TIPS) set under biplanar fluoroscopy using the distal end of the right brachiocephalic vein as a target, followed by balloon dilatation and partial extraction of thrombotic material of the left brachiocephalic vein with a wire basket. Finally, two overlapping stents were deployed to avoid early re-occlusion. Venography demonstrated complete vessel patency with free contrast media flow via the stents into the SVC, which was reconfirmed in follow-up examinations. Immediate clinical improvement was observed. Venous vascular recanalization of chronic venous occlusion by means of a TIPS needle is feasible as a last resort under certain precautions.

Honnef, Dagmar, E-mail: honnef@rad.rwth-aachen.de; Wingen, Markus; Guenther, Rolf W.; Haage, Patrick [University Hospital, Department of Diagnostic Radiology (Germany)

2005-06-15

9

Cholecystocutaneous fistula: an unusual complication of a para-umbilical hernia repair.  

PubMed

This case describes a 94-year-old woman who presented 2?years postsutured para-umbilical hernia repair with a painful black lump protruding through her scar with blood stained discharge. This was initially thought to be either ischaemic bowel secondary to strangulated incisional hernia or a large organised haematoma. An urgent CT scan was performed following which the patient passed two large calculi and bile-stained fluid spontaneously through the wound, making the diagnosis somewhat clearer. The scan revealed an incisional hernia containing the gallbladder and two large calculi at the skin surface and an incidental large caecal cancer with surrounding lymphadenopathy. Frail health and the incidental finding of a colon cancer rendered invasive surgical management inappropriate. Therefore, she was managed conservatively with antibiotics. A catheter was inserted into the fistula tract to allow free drainage and alleviate pressure-related symptoms. The patient was discharged following a multidisciplinary team discussion. PMID:24862413

Dixon, Steven; Sharma, Mitesh; Holtham, Stephen

2014-01-01

10

Power-Pulse Thrombolysis and Stent Recanalization for Acute Post-Liver Transplant Iliocaval Venous Thrombosis  

SciTech Connect

Postoperative inferior vena cava (IVC) thrombosis is a potentially lethal complication in a liver transplant recipient. We report the case of a 57-year-old liver transplant recipient, who developed acute, postoperative, markedly symptomatic complete IVC, ilial-femoral-caval, and left renal vein thrombosis. After treatment with power-pulse tissue plasminogen activator thrombolysis, thrombectomy, and stent placement, the IVC and iliac veins were successfully recanalized. At 2.5-year imaging and laboratory follow-up, the IVC, iliac, and renal veins remained patent and graft function was preserved.

Baccin, Carlos E.; Haskal, Ziv J., E-mail: ziv1@mac.co [New York Presbyterian Hospital/Columbia University Medical Center (United States)

2008-07-15

11

Novel Percutaneous Radiofrequency Ablation of Portal Vein Tumor Thrombus: Safety and Feasibility  

SciTech Connect

We report our experience of the safety of partial recanalization of the portal vein using a novel endovascular radiofrequency (RF) catheter for portal vein tumor thrombosis. Six patients with liver cancer and tumor thrombus in the portal vein underwent percutaneous intravascular radiofrequency ablation (RFA) using an endovascular bipolar RF device. A 0.035-inch guidewire was introduced into a tributary of the portal vein and through which a 5G guide catheter was introduced into the main portal vein. After manipulation of the guide catheter over the thrombus under digital subtraction angiography, the endovascular RF device was inserted and activated around the thrombus. There were no observed technique specific complications, such as hemorrhage, vessel perforation, or infection. Post-RFA portography showed partial recanalization of portal vein. RFA of portal vein tumor thrombus in patients with hepatocellular carcinoma is technically feasible and warrants further investigation to assess efficacy compared with current recanalization techniques.

Mizandari, Malkhaz [High Technology Medical Center, Tbilisi State Medical University (Georgia)] [High Technology Medical Center, Tbilisi State Medical University (Georgia); Ao, Guokun [The 309 Hospital of People's Liberation Army, Department on Oncology (China)] [The 309 Hospital of People's Liberation Army, Department on Oncology (China); Zhang Yaojun; Feng Xi [Imperial College London, Department of Surgery and Cancer (United Kingdom)] [Imperial College London, Department of Surgery and Cancer (United Kingdom); Shen Qiang [The First Minimally Invasive Department of Eastern Hepatobiliary Surgery Hospital (China)] [The First Minimally Invasive Department of Eastern Hepatobiliary Surgery Hospital (China); Chen Minshan [Cancer Centre of Sun Yat-Sen University, Department of Hepatobiliary Surgery (China)] [Cancer Centre of Sun Yat-Sen University, Department of Hepatobiliary Surgery (China); Lau, Wan Yee [Chinese University of Hong Kong, Department of Surgery, Faculty of Medicine (Hong Kong)] [Chinese University of Hong Kong, Department of Surgery, Faculty of Medicine (Hong Kong); Nicholls, Joanna; Jiao Long; Habib, Nagy, E-mail: nagy.habib@imperial.ac.uk [Imperial College London, Department of Surgery and Cancer (United Kingdom)] [Imperial College London, Department of Surgery and Cancer (United Kingdom)

2013-02-15

12

Factors Associated with Recurrence of Varicose Veins after Thermal Ablation: Results of The Recurrent Veins after Thermal Ablation Study  

PubMed Central

Background. The goal of this retrospective cohort study (REVATA) was to determine the site, source, and contributory factors of varicose vein recurrence after radiofrequency (RF) and laser ablation. Methods. Seven centers enrolled patients into the study over a 1-year period. All patients underwent previous thermal ablation of the great saphenous vein (GSV), small saphenous vein (SSV), or anterior accessory great saphenous vein (AAGSV). From a specific designed study tool, the etiology of recurrence was identified. Results. 2,380 patients were evaluated during this time frame. A total of 164 patients had varicose vein recurrence at a median of 3 years. GSV ablation was the initial treatment in 159 patients (RF: 33, laser: 126, 52 of these patients had either SSV or AAGSV ablation concurrently). Total or partial GSV recanalization occurred in 47 patients. New AAGSV reflux occurred in 40 patients, and new SSV reflux occurred in 24 patients. Perforator pathology was present in 64% of patients. Conclusion. Recurrence of varicose veins occurred at a median of 3 years after procedure. The four most important factors associated with recurrent veins included perforating veins, recanalized GSV, new AAGSV reflux, and new SSV reflux in decreasing frequency. Patients who underwent RF treatment had a statistically higher rate of recanalization than those treated with laser. PMID:24592172

Bush, R. G.; Bush, P.; Flanagan, J.; Fritz, R.; Gueldner, T.; Koziarski, J.; McMullen, K.; Zumbro, G.

2014-01-01

13

Mechanical Thrombolysis in Acute Ischemic Stroke With Endovascular Photoacoustic Recanalization  

Microsoft Academic Search

Background and Purpose—We present the results of endovascular photoacoustic recanalization (EPAR) treatment for acute ischemic stroke from the Safety and Performance Study at 6 centers in Europe and North America. The objectives of mechanical thrombolysis are rapid vessel recanalization and minimal use of chemical thrombolysis. Methods—This study was a prospective, nonrandomized study. The National Institutes of Health Stroke Scale (NIHSS)

Ansgar Berlis; Helmi Lutsep; Stan Barnwell; Alexander Norbash; Lawrence Wechsler; Charles A. Jungreis; Andrew Woolfenden; Gary Redekop; Marius Hartmann; Martin Schumacher

2010-01-01

14

Varicose Veins  

MedlinePLUS

Varicose veins are swollen, twisted veins that you can see just under the skin. They usually occur in ... of the body. Hemorrhoids are a type of varicose vein. Your veins have one-way valves that help ...

15

Huge Trombus including Left Renal Vein, Ovarian Vein, and Inferior Vena Cava Mimicking Renal Colic  

PubMed Central

A 31-year-old female presented with acute left flank pain; she had a C/S at the postpartum day 24. Ureteral stone was suspected but ultrasound examination was normal. Then Doppler ultrasound revealed a trombus in left renal vein and inferior vena cava. Contrast enhanced MDCT scan showed swelled and nonfunctional left kidney, a trombus including distal part of left ovarian vein, left renal vein, and inferior vena cava. We started anticoagulation treatment. Further examination revealed diagnosis of chronic myeloproliferative disease. The trombus was completely recanalized at 3-month followup. PMID:25140270

Coban, Sermin; Katgi, Abdullah; Obuz, Funda; Kefi, Aykut

2014-01-01

16

Frequency and patterns of early recanalization after vasectomy  

PubMed Central

Background Our understanding of early post-vasectomy recanalization is limited to histopathological studies. The objective of this study was to estimate the frequency and to describe semen analysis patterns of early recanalization after vasectomy. Methods Charts displaying serial post-vasectomy semen analyses were created using the semen analysis results from 826 and 389 men participating in a randomized trial of fascial interposition (FI) and an observational study of cautery, respectively. In the FI trial, participants were randomly allocated to vas occlusion by ligation and excision with or without FI. In the cautery study, sites used their usual cautery occlusion technique, two with and two without FI. Presumed early recanalization was based on the assessment of individual semen analysis charts by three independent reviewers. Discrepancies were resolved by consensus. Results Presumed early recanalization was characterized by a very low sperm concentration within two weeks after vasectomy followed by return to large numbers of sperm over the next few weeks. The overall proportion of men with presumed early recanalization was 13% (95% CI 12%–15%). The risk was highest with ligation and excision without FI (25%) and lowest for thermal cautery with FI (0%). The highest proportion of presumed early recanalization was observed among men classified as vasectomy failures. Conclusion Early recanalization, occurring within the first weeks after vasectomy, is more common than generally recognized. Its frequency depends on the occlusion technique performed. PMID:16984640

Labrecque, Michel; Hays, Melissa; Chen-Mok, Mario; Barone, Mark A; Sokal, David

2006-01-01

17

Varicose Veins  

MedlinePLUS

... page from the NHLBI on Twitter. What Are Varicose Veins? Español Varicose (VAR-i-kos) veins are swollen, ... can form in other parts of the body. Varicose veins are a common condition. They usually cause few ...

18

[Treatment of venous trophic ulcers, using echoscleroobliteration of perforant veins].  

PubMed

In 36 patients, suffering trophic ulcers on a chronic venous insufficiency background in a decompensated stage (C6 in accordance to CEAP), echoscleroobliteration of perforant veins, using a "foam-form" method in accordance to Tessari, was performed. In 29 patients postrombophlebitic syndrome in incomplete recanalization stage was diagnosed, in 7 recurrence of varicose disease of the lower extremities. In all the patients during echoscleroobliteration there was possible to obliterate the insufficient perforant veins, in 3 patients two perforant veins were obliterated in each of them. In a one week a pathological blood flow along perforant veins, in accordance to data of ultrasound duplex scanning, was absent. This effect lasted during 6 mo in 29 (80.6%) patients. In 25 (69.4%) patients a trophic ulcers healing was achieved in 1 - 3 mo. In a one year in 30 (83.3%) patients a stable obliteration was noted, in 3 (8.3%) - partial recanalization, in 3 (8.3%) - complete recanalization of perforant veins. PMID:24923110

Rusyn, V I; Korsak, V V; Boldizhar, P O; Borsenko, M I; Mytrovka, B A

2014-02-01

19

Varicose Veins  

MedlinePLUS Videos and Cool Tools

... blood can reverse its flow. This causes increased pressure in the veins, and over time can cause ... swell and become bulging, varicose veins. The increased pressure can lead to significant symptoms such as: swelling ...

20

Transvaginal fluoroscopic recanalization of a proximally occluded oviduct  

SciTech Connect

A hysterosalpingogram performed on a patient with infertility showed bilateral interstitial obstruction with partial intramural patency of the right tube and complete intramural obstruction of the left. Recanalization of the tube under fluoroscopy resulted in unilateral tubal patency and an intrauterine pregnancy followed. 7 references, 3 figures.

Platia, M.P.; Krudy, A.G.

1985-11-01

21

Embolus extravasation is an alternative mechanism for cerebral microvascular recanalization  

PubMed Central

Cerebral microvascular occlusion is a common phenomenon throughout life1,2 that could be an underappreciated mechanism of brain pathology. Failure to promptly recanalize microvessels may lead to disruption of brain circuits and significant functional deficits3. Hemodynamic forces and the fibrinolytic system4 are considered the principal mechanisms responsible for recanalization of occluded cerebral capillaries and terminal arterioles. However, using high resolution fixed tissue microscopy and two photon imaging in living mice we found that a large fraction of occluding microemboli failed to be lysed and washed out within 48 hours after internal carotid infusion. Surprisingly, emboli were instead found to translocate outside the vessel lumen within 2-7 days leading to complete re-establishment of blood flow and sparing of the vessel. Recanalization occurred by a previously unknown mechanism of microvascular plasticity involving the rapid envelopment of emboli by endothelial membrane projections which subsequently form a new vessel wall. This was followed by the formation of an endothelial opening through which emboli translocated into the perivascular parenchyma. The rate of embolus extravasation was significantly reduced by pharmacological inhibition of matrix metalloproteinase 2/9 activity. In aged mice, extravasation was markedly delayed, resulting in persistent tissue hypoxia, synaptic damage and cell death. Our study identifies a novel cellular mechanism that may be critical for recanalization of occluded microvessels. Alterations in the efficiency of this protective mechanism may have important implications in microvascular pathology, stroke recovery, and age-related cognitive decline. PMID:20505729

Lam, Carson K.; Yoo, Taehwan; Hiner, Bennett; Liu, Zhiqiang; Grutzendler, Jaime

2010-01-01

22

Portal vein thrombosis with protein C-S deficiency in a non-cirrhotic patient  

PubMed Central

There are several conditions that can lead to portal vein thrombosis (PVT), including including infection, malignancies, and coagulation disorders. Anew condition of interest is protein C and S deficiencies, associated with hypercoagulation and recurrent venous thromboembolism. We report the case of a non-cirrhotic 63-year-old male diagnosed with acute superior mesenteric vein thrombosis and PVT and combined deficiencies in proteins C and S, recanalized by short-term low molecular heparin plus oral warfarin therapy. PMID:25068006

Rodríguez-Leal, Gustavo A; Morán, Segundo; Corona-Cedillo, Roberto; Brom-Valladares, Rocío

2014-01-01

23

What Causes Varicose Veins?  

MedlinePLUS

... page from the NHLBI on Twitter. What Causes Varicose Veins? Weak or damaged valves in the veins can ... space. These are varicose veins. Normal Vein and Varicose Vein Figure A shows a normal vein with a ...

24

Endovascular Recanalization for Chronic Symptomatic Intracranial Vertebral Artery Total Occlusion  

PubMed Central

Purpose. The outcome of recanalization in patients with chronic symptomatic intracranial vertebral artery (ICVA) total occlusion is poor. This paper reports the technical feasibility and long-term outcome of ICVA stenting in patients with chronic symptomatic total occlusion. Methods. Retrospective review of our prospectively maintained intracranial intervention database to identify patients with symptomatic total occlusion of ICVA with revascularization attempted >1 month after index ischemic event. Results. Eight patients (mean age 58 years) were identified. One had stroke and 7 had recurrent transient ischemic attacks. Four had bilateral ICVA total occlusion and 4 had unilateral ICVA total occlusion with severe stenosis contralaterally. Seven of 8 patients underwent endovascular recanalization, which was achieved in 6. Periprocedural complications included cerebellum hemorrhage, arterial dissection, perforation, and subacute in-stent thrombosis which occurred in 3 patients. One patient died of cerebellum hemorrhage. The other patients improved clinically after endovascular therapy. Conclusions. Stent-supported recanalization of ICVA total occlusion is technically feasible, and may become a viable treatment option in selected patients. PMID:25276423

Xu, Ziqi; Ma, Ning; Mo, Dapeng; Wong, Edward Ho chung; Gao, Feng; Jiao, Liqun; Miao, Zhongrong

2014-01-01

25

Retrograde recanalization of complex SFA lesions indications and techniques.  

PubMed

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

Fanelli, F; Cannavale, A

2014-08-01

26

Sclerotherapy of Varicose Veins and Spider Veins  

MedlinePLUS

Sclerotherapy of Varicose Veins and Spider Veins • Overview Sclerotherapy is a minimally invasive treatment used to treat varicose and spider veins. The ... cramps. It is the primary treatment for small varicose veins in the legs. top of page • Preparation You ...

27

Fallopian tube recanalization: lessons learnt and future challenges.  

PubMed

Technological advances in fiberoptics and endoscopy have resulted in the development of minimally invasive transcervical tubal catheterization procedures with the potential of improved diagnostic accuracy of tubal disease and transcervical treatment of proximal tubal obstruction (PTO) with reduced risks, costs and morbidity compared with surgical procedures. Fallopian tube recanalization can be performed with catheters, flexible atraumatic guidewires or balloon systems under endoscopic (falloposcopy/hysteroscopy/laparoscopy), sonographic, fluoroscopic or tactile guidance. Falloposcopy provides a unique possibility to accurately visualize and grade endotubal disease, characterize and document endotubal lesions, identify the segmental location of tubal pathology without complications, objectively classify the cause of PTO and guide future patient management. This is in contrast to the surgical and radiological gold standards, laparoscopy and hysterosalpingography, respectively, that are often associated with poor or misdiagnosis of PTO. Nonhysteroscopic transuterine falloposcopy using the linear eversion catheter is a successful, well-tolerated, outpatient technique with a good predictive value for future fertility. Hysteroscopic-falloposcopic-laparoscopic tubal aquadissection, guidewire cannulation, guidewire dilatation and direct balloon tubuloplasty may be used therapeutically to breakdown intraluminal adhesions or dilate a stenosis in normal or minimally diseased tubes with high patency and pregnancy rates. However, guidewire cannulation of proximally obstructed tubes yields much lower pregnancy rates compared with other catheter techniques, despite the high tubal patency rates. Laparo-hysteroscopic selective tubal catheterization with insufflation of oil-soluble radiopaque dye has been reported to be an effective treatment for infertility associated with endometriosis. The various disadvantages associated with fluoroscopic and sonographic techniques limit their application, despite the reportedly high patency and intrauterine pregnancy rates. Recanalization is contraindicated in florid infections and genital tuberculosis, obliterative fibrosis and long tubal obliterations that are difficult to bypass with the catheter, severe tubal damage, male subfertilitY and previously performed tubal surgery. Distal tubal obstruction is not amenable to catheter recanalization techniques. Tuberculosis, salpingitis isthmica nodosa, isthmic occlusion with club-changed terminal, ampullar or fimbrial occlusion, and tubal fibrosis have been cited as reasons for recanalization failure. In lieu of the poor pregnancy outcomes in patients with severe tubal disease and poor mucosal health following tubal recanalization, as well as poor available technical skills and results with microsurgery, in vitro fertilization and embryo transfer is a valid option in such women. Despite the high diagnostic and therapeutic power of falloposcopic interventions, technical shortcomings with falloposcopy must be overcome before the procedure gains widespread acceptance. PMID:20597618

Allahbadia, Gautam N; Merchant, Rubina

2010-07-01

28

Pull-Through Technique for Recanalization of Occluded Portosystemic Shunts (TIPS): Technical Note and Review of the Literature  

SciTech Connect

Transjugular intrahepatic portosystemic shunt (TIPS) dysfunction is an important problem after creation of shunts. Most commonly, TIPS recanalization is performed via the jugular vein approach. Occasionally it is difficult to cross the occlusion. We describe a hybrid technique for TIPS revision via a direct transhepatic access combined with a transjugular approach. In two cases, bare metal stents or polytetrafluoroethylene (PTFE)-covered stent grafts had been placed in TIPS tract previously, and they were completely obstructed. The tracts were inaccessible via the jugular vein route alone. In each case, after fluoroscopy or computed tomography-guided transhepatic puncture of the stented segment of the TIPS, a wire was threaded through the shunt and snared into the right jugular vein. The TIPS was revised by balloon angioplasty and additional in-stent placement of PTFE-covered stent grafts. The patients were discharged without any complications. Doppler sonography 6 weeks after TIPS revision confirmed patency in the TIPS tract and the disappearance of ascites. We conclude that this technique is feasible and useful, even in patients with previous PTFE-covered stent graft placement.

Tanaka, Toshihiro, E-mail: toshihir@bf6.so-net.ne.jp; Guenther, Rolf W., E-mail: guenther@rad.rwth-aachen.de; Isfort, Peter, E-mail: isfort@hia.rwth-aachen.de [RWTH Aachen University, Department of Diagnostic Radiology, Aachen University Hospital (Germany); Kichikawa, Kimihiko, E-mail: kkichika@naramed-u.ac.jp [Nara Medical University, Department of Radiology (Japan); Mahnken, Andreas H., E-mail: mahnken@rad.rwth-aachen.de [RWTH Aachen University, Department of Diagnostic Radiology, Aachen University Hospital (Germany)

2011-04-15

29

Computed tomography angiography-guided recanalization of saphenous vein graft chronic total occlusion  

PubMed Central

Computed tomography (CT) angiography can augment conventional coronary angiography relative to length of vessel occlusion and quality of distal run-off. In this case report we describe the significance of CT angiography in the revascularization decision-making process of a patient following occlusion of both coronary artery bypass grafts. PMID:22291813

Hajek, Petr; Adla, Theodor; Taborska, Katerina; Veselka, Josef

2011-01-01

30

Varicose Veins and Spider Veins  

MedlinePLUS

... one-way flaps to prevent blood from flowing backwards as it moves up your legs. If the ... to heal. Sometimes they cannot heal until the backward blood flow in the vein is repaired. • Bleeding. ...

31

Successful recanalization for acute ischemic stroke via the transbrachial approach.  

PubMed

The recent development of revascularization devices, including stent retrievers, has enabled increasingly higher revascularization rates for arterial occlusions in acute ischemic stroke. Patient-specific factors such as anatomy, however, may occasionally limit endovascular deployment of these new devices via the conventional transfemoral approach. We report three cases of acute ischemic stroke where a transbrachial endovascular approach to revascularization was used, resulting in successful recanalization. These examples suggest that a transbrachial approach may be considered as an alternative in the endovascular treatment of acute ischemic stroke. PMID:25471073

Okawa, Masakazu; Tateshima, Satoshi; Liebeskind, David; Ali, Latisha K; Thompson, Michael L; Saver, Jeffrey; Duckwiler, Gary R

2014-12-01

32

Use of Nitinol Stents Following Recanalization of Central Venous Occlusions in Hemodialysis Patients  

SciTech Connect

Purpose. To retrospectively review the patency of endovascular interventions with nitinol stent placement for symptomatic central venous occlusions in hemodialysis patients. Methods. A retrospective review of all patients who underwent endovascular interventions for dysfunctional hemodialysis grafts and fistulas was performed from April 2004 to August 2006. A total of 6 patients presented with arm and/or neck and facial swelling and left brachiocephalic vein occlusion. The study group consisted of 3 men and 3 women with a mean age of 79.5 years (SD 11.2 years). Of these 6 patients, 1 had a graft and 5 had fistulas in the left arm. The primary indication for nitinol stent placement was technical failure of angioplasty following successful traversal of occluded central venous segments. Patency was assessed from repeat fistulograms and central venograms performed when patients redeveloped symptoms or were referred for access dysfunction determined by the ultrasound dilution technique. No patients were lost to follow-up. Results. Nitinol stent placement to obtain technically successful recanalization of occluded venous segments was initially successful in 5 of 6 patients (83%). In 1 patient, incorrect stent positioning resulted in partial migration to the superior vena cava requiring restenting to prevent further migration. Clinical success was observed in all patients (100%). Over the follow-up period, 2 patients underwent repeat intervention with angioplasty alone. Primary patency was 83.3% (95% CI 0.5-1.2) at 3 months, and 66.7% at 6 and 12 months (0.2-1.1, 0.1-1.2). Secondary patency was 100% at 12 months with 3 patients censored over that time period. Mean primary patency was 10.4 months with a mean follow-up of 12.4 months. No complications related to recanalization of the occluded central venous segments were observed. Conclusion. Our initial experience has demonstrated that use of nitinol stents for central venous occlusion in hemodialysis patients is associated with good mid-term patency and may exceed historical observations with prior use of Wallstents.

Rajan, Dheeraj K., E-mail: dheeraj.rajan@uhn.on.ca; Saluja, Jasdeep S. [Toronto General Hospital, University Health Network University of Toronto, Division of Vascular and Interventional Radiology, Department of Medical Imaging (Canada)

2007-07-15

33

Varicose vein - noninvasive treatment  

MedlinePLUS

... Laser therapy - varicose veins; Radiofrequency vein ablation; Endovenous thermal ablation; Ambulatory phlebectomy; Transilluminated power phlebotomy; Endovenous laser ablation; Varicose vein therapy

34

Patterns of recurrent disease after recanalization of femoropopliteal artery occlusions  

SciTech Connect

Purpose. In this prospective study we investigated the site, occurrence, and development of stenoses and occlusions following recanalization of superficial femoral artery occlusions. Methods. Recanalization of an occluded femoropopliteal artery was attempted in 62 patients. Follow-up examinations included clinical examination and color-flow duplex scanning at regular intervals. Arteriography was used to determine the localization of the recurrent disease relative to the initially occluded segment. Results. During a mean follow-up of 23 months (range 0-69 months) 14 high-grade restenoses, indicated by a peak systolic velocity ratio {>=}3.0, were detected by color-flow duplex scanning. Occlusion of the treated segment occurred in 11 patients. The cumulative 3-year primary patency rate for high-grade restenoses and occlusions combined was 44% (SE 9%). By arteriographic examination the site of restenosis was localized in the distal half of the treated vessel segment in 16 of 21 cases. Conclusion. Most restenoses and occlusions occurred during the first year and most disease developed at the previous intervention site. The site of restenosis is more frequently in the distal part of the initially treated segment, a finding that may have therapeutic implications.

Vroegindeweij, Dammis; Tielbeek, Alexander V. [Catharina Hospital, Department of Radiology (Netherlands); Buth, Jaap [Catharina Hospital, Department of Vascular Surgery (Netherlands); Vos, Louwerens D.; Bosch, Harrie C. M. van den [Catharina Hospital, Department of Radiology (Netherlands)

1997-07-15

35

Impacts of Rapid Recanalization and Collateral Circulation on Clinical Outcome after Intraarterial Thrombolysis  

PubMed Central

Background and Purpose Rapid recanalization might improve clinical outcomes after intraarterial thrombolysis (IAT) for acute ischemic stroke patients with collateral circulation. We determined whether rapid recanalization and collateral circulation affect clinical outcomes after IAT. Methods We retrospectively evaluated the clinical and radiological data of 134 consecutive patients who underwent IAT for intracranial artery occlusion. The interval from symptom onset to recanalization after IAT (onset-to-recanalization time) as an estimate of the probability of good clinical outcome (modified Rankin scale 0-2) was calculated in patients with collateral circulation in the ischemic hemisphere, which was rated poor (0/1 American Society of Interventional and Therapeutic Neuroradiology criteria) or good (2-4). Changes in National Institute of Health Stroke Scale (NHISS) score before and after IAT and modified Rankins scale scores 3 months after discharge were compared with respect to onset-to-recanalization time. Results In patients with good collateral circulation, the estimated onset-to-recanalization time for a 0.5 probability of a good clinical outcome was 347 minutes; with poor collateral circulation, it was 172 minutes for a 0.2 probability of good clinical outcome. Outcome analyses according to onset-to-recanalization time showed patients recanalized <6 hours had lower NHISS scores (<4.5, 4.5-6, >6 hours of onset-to-recanalization time, and non-recanalization: 5.1, 6.9, 11.9, and 19.8, respectively) at discharge and higher percentages of good clinical outcome (69%, 66.7%, 21.9%, and 0%, respectively) 3 months after IAT. Conclusions The time window to expect a high probability of a good clinical outcome after IAT is highly dependent on the collateral circulation.

Jeong, Hye Seon; Kwon, Hyon-Jo; Song, Hee-Jung; Koh, Hyeon-Song; Kim, Yong Soo; Lee, Ju Hun; Shin, Jee Eun; Lee, Suk Hoon

2015-01-01

36

Recanalization Rates after Endovascular Coil Embolization in a Cohort of Matched Ruptured and Unruptured Cerebral Aneurysms  

PubMed Central

Summary The aim of this study was to retrospectively assess the recanalization rate, factors associated with and time taken for recanalization to occur in a matched ruptured and unruptured aneurysm population that were treated with endovascular coiling. Ruptured and unruptured aneurysms treated between 2002 and 2007 were matched for aneurysm location, diameter and neck size. Recanalization rate, time to recanalize, re-treatment rate and clinical outcome were analysed. Ninety-eight matched ruptured and unruptured aneurysms (49 aneurysms in each group) were studied. 46.8% of aneurysms in the ruptured group achieved complete obliteration on the initial post treatment angiogram versus 34.7% in the unruptured group. The ruptured group had a higher rate of recanalization (40.4% versus 20.4%). 25.5% of aneurysms had significant recanalization in the ruptured group versus 6.1% in the unruptured group (p=0.009). The retreatment rate was higher in the ruptured group (21.3% versus 6%). Ruptured aneurysms took a shorter time to recanalize with a mean time of 5.3±3.8 months versus 12.4±7.7months (p=0.003). Multivariate logistic regression analysis found neck size (p=0.0098), wide neck morphology (p=0.0174), aneurysm diameter (p< 0.0001) and ruptured aneurysms (p=0.0372) were significant predictors of recanalization. The majority of patients in both groups had a good outcome with GOS=5 (85.7% and 83.7%) but two deaths occurred in the ruptured group. Ruptured and unruptured aneurysms showed significant differences in rate, degree and timing of recanalization, thus requiring different protocols for imaging follow-up post endovascular treatment. Earlier and more frequent imaging follow-up is recommended for ruptured aneurysms. PMID:21561556

Tan, I.Y.L.; Agid, R.F.; Willinsky, R.A.

2011-01-01

37

Laser-assisted versus mechanical recanalization of femoral arterial occlusions.  

PubMed

A randomized clinical trial was performed to test the hypothesis that a laser-heated probe is superior to standard techniques to reopen occluded femoral arteries. Twenty patients were treated with a standard guidewire and balloon dilation method. In a second group of 20 patients, the laser probe was initially used as a nonheated mechanical device. If the probe was unsuccessful in mechanically reopening the artery, an Argon laser was activated to heat the probe. The mean length of occlusion was 15.9 +/- 10.3 cm. The success rate for the laser probe was 15 of 20 (75%), which was not significantly different from the standard method, 19 of 20 (95%). Most of the success in the laser-probe group was due to the probe's mechanical properties. The laser probe was successful as a cold, mechanical device in 13 of 15 (87%) arteries. It was necessary to heat the probe in 5 patients. When heated, the laser probe assisted recanalization in 2 but perforated the artery in 3 cases. The results of this randomized trial do not support the hypotheses behind the use of the thermal laser probe. The laser probe functions primarily as a mechanical device. The thermal activation does not significantly improve the success rate without increasing the risk of perforation. This small additional benefit does not justify the large cost of current thermal laser devices. This controlled study also demonstrates a higher success rate in long occlusions than previous reports of mechanical balloon recanalization. This is due to a combination approach of retrograde and anterograde probing of the occluded segment. PMID:1833969

Tobis, J M; Conroy, R; Deutsch, L S; Gordon, I; Honye, J; Andrews, J; Profeta, G; Chatzkel, S; Berns, M

1991-10-15

38

[Renal arteriovenous fistula with a vein aneurysm: a case report].  

PubMed

A 54-year-old woman presented with abdominal distension. Her medical history was unremarkable. Contrast-enhanced computed tomography (CT) revealed a left renal arteriovenous fistula and a large vein aneurysm, and she was diagnosed with aneurismal-type renal arteriovenous fistula. She was successfully treated with transcatheter arterial embolization using steel coils. Although she had pulmonary embolism as a serious post-operative complication, she recovered with anticoagulant therapy using heparin and warfarin. A contrast-enhanced CT scan performed 6 months after transcatheter arterial embolization did not show recanalization. PMID:25142960

Sasaki, Yutaro; Oda, Shinpei; Fujikata, Shiro; Tanimoto, Shuji; Kan, Masaharu

2014-07-01

39

[Spontaneous recanalization after embolization of the renal artery with an Amplatzer vascular plug 4].  

PubMed

The Amplatzer vascular plug (AVP) is an occluding device used in vascular embolizations. Thanks to its excellent maneuverability and effectiveness, it is being used more and more often. The latest version, the AVP 4, enables access to smaller and more tortuous vessels. To date, the only cases of spontaneous recanalization published occurred with earlier versions of the AVP. We present a case of recanalization after renal artery embolization with an AVP 4. PMID:22281517

Gómez-Martínez, Pablo; Ciampi Dopazo, Juan José; González Fejás, Ariel; Lanciego, Carlos

2014-01-01

40

Focus on Varicose Veins  

MedlinePLUS

... Varicose Veins How are varicose veins diagnosed? The diagnosis of varicose veins is made primarily by physical examination. The accuracy of physical examination is further improved with the aid of a hand-held Doppler ( ...

41

What Are Varicose Veins?  

MedlinePLUS

... Main Page The Pink Locker Society What Are Varicose Veins? KidsHealth > Kids > Health Problems of Grown-Ups > Q & ... why veins look purple or blue. What Causes Varicose Veins? It's a lot of work to move all ...

42

Deep Vein Thrombosis  

MedlinePLUS

... the NHLBI on Twitter. What Is Deep Vein Thrombosis? Español Deep vein thrombosis (throm-BO-sis), or DVT, is a blood ... This Content: Next >> October 28, 2011 Deep Vein Thrombosis Clinical Trials Clinical trials are research studies that ...

43

Percutaneous Transsplenic Access to the Portal Vein for Management of Vascular Complication in Patients with Chronic Liver Disease  

SciTech Connect

Purpose: To evaluate the safety and feasibility of percutaneous transsplenic access to the portal vein for management of vascular complication in patients with chronic liver diseases. Methods: Between Sept 2009 and April 2011, percutaneous transsplenic access to the portal vein was attempted in nine patients with chronic liver disease. Splenic vein puncture was performed under ultrasonographic guidance with a Chiba needle, followed by introduction of a 4 to 9F sheath. Four patients with hematemesis or hematochezia underwent variceal embolization. Another two patients underwent portosystemic shunt embolization in order to improve portal venous blood flow. Portal vein recanalization was attempted in three patients with a transplanted liver. The percutaneous transsplenic access site was closed using coils and glue. Results: Percutaneous transsplenic splenic vein catheterization was performed successfully in all patients. Gastric or jejunal varix embolization with glue and lipiodol mixture was performed successfully in four patients. In two patients with a massive portosystemic shunt, embolization of the shunting vessel with a vascular plug, microcoils, glue, and lipiodol mixture was achieved successfully. Portal vein recanalization was attempted in three patients with a transplanted liver; however, only one patient was treated successfully. Complete closure of the percutaneous transsplenic tract was achieved using coils and glue without bleeding complication in all patients. Conclusion: Percutaneous transsplenic access to the portal vein can be an alternative route for portography and further endovascular management in patients for whom conventional approaches are difficult or impossible.

Chu, Hee Ho; Kim, Hyo-Cheol, E-mail: angiointervention@gmail.com; Jae, Hwan Jun [Seoul National University College of Medicine, Seoul National University Medical Research Center, Seoul National University Hospital, Department of Radiology, Institute of Radiation Medicine, Clinical Research Institute (Korea, Republic of); Yi, Nam-Joon; Lee, Kwang-Woong; Suh, Kyung-Suk [Seoul National University College of Medicine and Seoul National University Hospital, Department of Surgery (Korea, Republic of); Chung, Jin Wook; Park, Jae Hyung [Seoul National University College of Medicine, Seoul National University Medical Research Center, Seoul National University Hospital, Department of Radiology, Institute of Radiation Medicine, Clinical Research Institute (Korea, Republic of)

2012-12-15

44

Recanalization Results After Intracranial Stenting of Atherosclerotic Stenoses  

SciTech Connect

The purpose of this investigation was to provide a detailed description of the angiographic results after stenting of high-grade intracranial stenosis using balloon-expandable stents. Forty consecutive patients with symptomatic atherosclerotic intracranial stenosis >50% received endovascular treatment by placement of balloon-expandable stents using the concept of slight underdilation and strict avoidance of overdilation. Intra-arterial digital subtraction angiography images before and after stenting in the same projection were reviewed for pre- and post-therapeutic measurement of the degree of stenosis and evaluation of morphologic criteria like plaque coverage, stent apposition, patency of side branches, and signs of dissection or vasospasm. Stenting decreased the mean percentage stenosis from 76.2 (WASID criteria) to 20.8%. Residual stenosis ranged from 0 to 55% with residual stenosis >50% in two of 40 cases. Technical success rate was 95%. There were no major vessel complications, but minor abnormalities like incomplete stent apposition (8/40) or plaque coverage (7/40), incomplete filling of side branches (13/40), and minor dissections after stenting (2/40) were seen. One case with incomplete stent apposition and two cases with side branch compromise were associated with clinical symptoms. In conclusion, intracranial stenting with slight underdilation avoided major vessel complication and created reliable luminal gain. Suboptimal recanalization results were frequently detected and may be the source of neurological complications in individual cases.

Blasel, Stella, E-mail: Stella.Blasel@kgu.de; Yuekzek, Zeynep; Kurre, Wiebke; Berkefeld, Joachim [University of Frankfurt, Institute of Neuroradiology (Germany); Neumann-Haefelin, Tobias [University of Frankfurt, Department of Neurology (Germany); Hattingen, Elke; Mesnil de Rochemont, Richard du [University of Frankfurt, Institute of Neuroradiology (Germany)

2010-10-15

45

Recanalization within One Hour after Intravenous Tissue Plasminogen Activator Is Associated with Favorable Outcome in Acute Stroke Patients  

Microsoft Academic Search

Background\\/Aim: Early recanalization after tissue plasminogen activator (t-PA) infusion greatly improves outcome in stroke patients. However, the time threshold of early recanalization for a favorable outcome remains unclear. The aim of this study was to assess patient outcome 3 months after t-PA therapy among patients with early, delayed and without recanalization. Methods: Consecutive patients with major brain artery occlusion on

Kazumi Kimura; Yasuyuki Iguchi; Kensaku Shibazaki; Junya Aoki; Masao Watanabe; Kazuto Kobayashi; Yuki Sakamoto

2010-01-01

46

Recanalization of a ruptured vertebral artery dissecting aneurysm after occlusion of the dilated segment only  

PubMed Central

Background: Internal trapping in which the dissecting aneurysm is occluded represents reliable treatment to prevent rebleeding of ruptured vertebral artery (VA) dissecting aneurysms. Various methods of internal trapping are available, but which is most appropriate for preventing both recanalization of the VA and procedural complications is unclear. Case Description: A 61-year-old male presented with subarachnoid hemorrhage caused by rupture of a left VA dissecting aneurysm. Only the dilated segment of the aneurysm was occluded by coil embolization. Sixteen days after embolization, angiography showed recanalization of the treated left VA with blood supplying the dilated segment of the aneurysm, which showed morphological change between just proximal to the coil mesh and just distal to a coil, and antegrade blood flow through this part. Pathological examination showed that the rupture site that had appeared to be the most dilated area on angiography was located just above the orifice of the entrance. However, we think that this case of ruptured aneurysm had an entrance into a pseudolumen that existed proximal to the dilated segment, with antegrade recanalization occurring through the pseudolumen with morphological change because of insufficient coil obliteration of the entrance in the first therapy. Conclusions: This case suggests that occlusion of both the proximal and dilated segments of a VA dissecting aneurysm will prevent recanalization, by ensuring that any entrance to a pseudolumen of the aneurysm is completely closed. Careful follow-up after internal trapping is important, since antegrade recanalization via a pseudolumen may occur in the acute stage. PMID:25396072

Tanabe, Jun; Moroi, Junta; Yoshioka, Shotaro; Ishikawa, Tatsuya

2014-01-01

47

Spatial distribution of perfusion abnormality in acute MCA occlusion is associated with likelihood of later recanalization.  

PubMed

The aim of this study is to investigate whether different spatial perfusion-deficit patterns, which indicate differing compensatory mechanisms, can be recognized and used to predict recanalization success of intravenous fibrinolytic therapy in acute stroke patients. Twenty-seven acute stroke data sets acquired within 6 hours from symptom onset including diffusion- (DWI) and perfusion-weighted magnetic resonance (MR) imaging (PWI) were analyzed and dichotomized regarding recanalization outcome using time-of-flight follow-up data sets. The DWI data sets were used for calculation of apparent diffusion coefficient (ADC) maps and subsequent infarct core segmentation. A patient-individual three-dimensional (3D) shell model was generated based on the segmentation and used for spatial analysis of the ADC as well as cerebral blood volume (CBV), cerebral blood flow, time to peak (TTP), and mean transit time (MTT) parameters derived from PWI. Skewness, kurtosis, area under the curve, and slope were calculated for each parameter curve and used for classification (recanalized/nonrecanalized) using a LogitBoost Alternating Decision Tree (LAD Tree). The LAD tree optimization revealed that only ADC skewness, CBV kurtosis, and MTT kurtosis are required for best possible prediction of recanalization success with a precision of 85%. Our results suggest that the propensity for macrovascular recanalization after intravenous fibrinolytic therapy depends not only on clot properties but also on distal microvascular bed perfusion. The 3D approach for characterization of perfusion parameters seems promising for further research. PMID:24473482

Siemonsen, Susanne; Forkert, Nils Daniel; Hansen, Anne; Kemmling, Andre; Thomalla, Götz; Fiehler, Jens

2014-05-01

48

Recanalization of Splenic Artery Aneurysm After Transcatheter Arterial Embolization Using N-Butyl Cyanoacrylate  

SciTech Connect

A 65-year-old woman who had been diagnosed as having microscopic polyangiitis developed sudden abdominal pain and entered a state of shock. Abdominal CT showed massive hemoperitoneum, and emergent angiography revealed a ruptured splenic artery aneurysm. After direct catheterization attempts failed due to tortuous vessels and angiospasm, transcatheter arterial embolization using an n-butyl cyanoacrylate (NBCA)-lipiodol mixture was successfully performed. Fifty days later, the patient developed sudden abdominal pain again. Repeated angiography demonstrated recanalization of the splenic artery and splenic artery aneurysm. This time, the recanalized aneurysm was embolized using metallic coils with the isolation method. Physicians should keep in mind that recanalization can occur after transcatheter arterial embolization using N-butyl cyanoacrylate, which has been used as a permanent embolic agent.

Matsumoto, Keiji; Ushijima, Yasuhiro, E-mail: ushijima@radiol.med.kyushu-u.ac.jp; Tajima, Tsuyoshi; Nishie, Akihiro; Hirakawa, Masakazu; Ishigami, Kousei [Kyushu University, Department of Clinical Radiology, Graduate School of Medical Sciences (Japan); Yamaji, Yukiko [Kyushu University, Department of Medicine and Biosystemic Science, Graduate School of Medical Sciences (Japan); Honda, Hiroshi [Kyushu University, Department of Clinical Radiology, Graduate School of Medical Sciences (Japan)

2010-02-15

49

Triaxial System in Re-Embolization for Recanalization of Pulmonary Arteriovenous Malformations  

PubMed Central

Summary Background Recanalization occurs occasionally, following coil embolization of pulmonary arteriovenous malformations (PAVM), and can lead to ischemic stroke; therefore re-embolization is important. A 1.9-Fr. no-taper microcatheter that can be inserted into a 2.7-Fr. microcatheter (named the triaxial system) has recently become available, and contributes to super-selective catheterization for small or tortuous vessels. The aim of this study was to evaluate the usefulness of re-embolization for recanalization of PAVM using the triaxial system. Material/Methods Recanalization was diagnosed in 8 patients with 13 PAVMs between June 2011 and November 2012, and re-embolization was attempted with a conventional microcatheter at first in all 13 PAVMs. However, in three of them it failed with the conventional microcatheter, and then the system was exchanged to the triaxial system. Thus, re-embolization using the triaxial system was performed in 3 PAVMs of 3 female patients, with a median age of 63 years (range, 46–73 years). We assessed technical success, complications, and outcome. Results The disappearance of recanalization was confirmed by angiography in all re-embolization procedures (technical success rate was 100%). Re-embolization was then successfully achieved inside the original coils, and no branch artery of normal lung tissue was embolized. There were no complications related with this procedure. The blood flow of recanalization was decreased in all cases in a follow-up of 27–33 months (median, 31). Conclusions Triaxial system appears to be useful for recanalization of PAVM, especially in difficult cases with a conventional system.

Shimohira, Masashi; Hashizume, Takuya; Kawai, Tatsuya; Muto, Masahiro; Ohta, Kengo; Suzuki, Kazushi; Shibamoto, Yuta

2015-01-01

50

Subintimal Recanalization of Occluded Stents: The Substent Technique  

SciTech Connect

PurposeApplication of metal stents is complicated by neointimal hyperplasia leading to vessel restenosis and reocclusion. Treatment options in cases presenting with complete occlusion of the stented segment and recurrent critical limb ischemia (CLI) are limited. We present the option of the subintimal/substent technique in dealing with occluded stents.MethodsThe study included patients presenting with recurrent CLI due to impaired blood flow as a result of complete occlusion of previously inserted metal stents and unsuccessful intraluminal crossing of the lesion via either the antegrade or retrograde approach. In these cases, crossing the occlusion through the subintimal/substent plane was attempted. Primary end points included technical success, safety of the procedure, clinical improvement, and limb salvage, while secondary end points were patient survival, primary patency, and vessel restenosis rates at 1-year follow-up. Study end points were calculated by Kaplan-Meier survival analysis.ResultsBetween July 2006 and October 2011, a total of 14 patients (mean age 69.14 {+-} 12.59 years, 12 men) were treated with the substent technique and included in the analysis. Technical success rate was 85.71 % (12 of 14), with a total lesion length of 193.57 {+-} 90.78 mm. The mean occluded stented segment length was 90.21 {+-} 44.34 mm. In 10 (83.33 %) of 12 cases, a new stent had to be placed by the side of the old occluded one, while the remaining two cases (16.67 %) were treated only with balloon angioplasty. No serious adverse events were noted during the immediate postprocedural period. All successfully treated patients improved clinically. Estimated limb salvage was 90.9 %, and patient survival rate was 90.0 % at 1 year's follow-up. Primary patency was 45.50 % and vessel restenosis 77.30 %.ConclusionSubintimal recanalization of occluded metal stents through the substent plane is a valuable alternative treatment option, especially in patients with recurrent CLI with few alternatives.

Diamantopoulos, Athanasios, E-mail: adiamant@upatras.gr; Katsanos, Konstantinos; Spiliopoulos, Stavros; Karnabatidis, Dimitris; Siablis, Dimitris [School of Medicine, Patras University Hospital, Department of Interventional Radiology (Greece)

2013-08-01

51

Successful Recanalization of a Longstanding Right Common Iliac Artery Occlusion with a Radiofrequency Guidewire  

SciTech Connect

We describe a case of successful recanalization of a longstanding right common iliac occlusion with a radiofrequency (RF) guidewire. The patient had been symptomatic with claudication for 3 years, and a preliminary attempt to cross the lesion using conventional techniques proved unsuccessful. Using low and medium intensity RF pulses and a PowerWire, a tract through the occlusion was established, which allowed subsequent stenting with an excellent angiographic result and a good immediate clinical response. We propose this as a useful technique in the peripheral arterial system for occlusive lesions not amenable to traditional recanalization techniques.

Tapping, C. R.; Uri, I. F.; Dixon, S.; Bratby, M. J.; Anthony, S.; Uberoi, R., E-mail: raman.uberoi@orh.nhs.uk [John Radcliffe Hospital, Department of Radiology (United Kingdom)

2012-10-15

52

P-030 A self-expanding wingspan stent-assisted recanalization for acute middle cerebral artery occlusion in case of failure or contraindication to intravenous thrombolysis  

Microsoft Academic Search

BackgroundEarly recanalization of occluded intracranial arteries in acute ischemic stroke is one of the most important factors for better clinical outcome. Recanalization with a self-expanding Wingspan stent, which can be deployed rapidly and safely, is an option for treating acute ischemic stroke when intravenous thrombolysis has failed or is contraindicated. We present the feasibility, efficacy and safety of recanalization with

S Sung; T Lee

2011-01-01

53

In vivo analysis of antithrombotic effectiveness of recombinant hirudin on microvascular thrombus formation and recanalization  

Microsoft Academic Search

Purpose: This study was undertaken to evaluate in vivo the effect of recombinant hirudin (r-hirudin [HBW 023]), a potent thrombin inhibitor, on the process of microvascular thrombus formation and recanalization. Methods: Thrombosis was induced photochemically in distinct arterioles (n = 25) and venules (n = 30) of the ear of 16 hairless hr\\/hr mice (8 to 10 weeks old, 25

Frank Roesken; Brigitte Vollmar; Martin Rücker; Dirk Seiffge; Michael D. Menger

1998-01-01

54

Transjugular Intrahepatic Portosystemic Shunt in a Patient with Cavernomatous Portal Vein Occlusion  

SciTech Connect

A 23-year-old woman with liver cirrhosis secondary to primary sclerosing cholangitis was referred to us for the treatment of recurrent bleeding from esophageal varices that had been refractory to endoscopic sclerotherapy. Her portal vein was occluded, associated with cavernous transformation. A transjugular intrahepatic portosystemic shunt (TIPS) was performed after a preprocedural three-dimensional computed tomographic angiography evaluation to determine feasibility. The portal vein system was recanalized and portal blood flow increased markedly after TIPS. Esophageal varices disappeared 3 weeks after TIPS. Re-bleeding and hepatic encephalopathy were absent for 3 years after the procedure. We conclude that with adequate preprocedural evaluation, TIPS can be performed safely even in patients with portal vein occlusion associated with cavernous transformation.

Kawamata, Hiroshi; Kumazaki, Tatsuo [Department of Radiology, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8603 (Japan); Kanazawa, Hidenori [Third Department of Internal Medicine, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8603 (Japan); Takahashi, Shuji; Tajima, Hiroyuki; Hayashi, Hiromitsu [Department of Radiology, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8603 (Japan)

2000-03-15

55

Central Vein Dilatation Prior to Concomitant Port Implantation  

SciTech Connect

Implantation of subcutaneous port systems is routinely performed in patients requiring repeated long-term infusion therapy. Ultrasound- and fluoroscopy-guided implantation under local anesthesia is broadly established in interventional radiology and has decreased the rate of complications compared to the surgical approach. In addition, interventional radiology offers the unique possibility of simultaneous management of venous occlusion. We present a technique for recanalization of central venous occlusion and angioplasty combined with port placement in a single intervention which we performed in two patients. Surgical port placement was impossible owing to occlusion of the superior vena cava following placement of a cardiac pacemaker and occlusion of multiple central veins due to paraneoplastic coagulopathy, respectively. In both cases the affected vessel segments were dilated with balloon catheters and the port systems were placed thereafter. After successful dilatation, the venous access was secured with a 25-cm-long, 8-Fr introducer sheath, a subcutaneous pocket prepared, and the port catheter tunneled to the venipuncture site. The port catheter was introduced through the sheath with the proximal end connected to a 5-Fr catheter. This catheter was pulled through the tunnel in order to preserve the tunnel and, at the same time, allow safe removal of the long sheath over the wire. The port system functioned well in both cases. The combination of recanalization and port placement in a single intervention is a straightforward alternative for patients with central venous occlusion that can only be offered by interventional radiology.

Krombach, Gabriele A., E-mail: krombach@rad.rwth-aachen.de; Plumhans, Cedric; Goerg, Fabian; Guenther, Rolf W. [University of Technology (RWTH) Aachen, Department of Diagnostic Radiology, University Hospital (Germany)

2010-04-15

56

The Smoking Paradox: Impact of Smoking on Recanalization in the Setting of Intra-Arterial Thrombolysis  

PubMed Central

Background The smoking paradox refers to a better outcome in smokers eligible for thrombolytic treatment in myocardial infarction or ischemic stroke. Recent findings suggest that current smokers may present higher recanalization rates after intravenous (IV) thrombolysis with recombinant tissue plasminogen activator (rt-PA). We evaluated the impact of smoking in a consecutive series of patients treated with intra-arterial (IA) rt-PA. Methods We analyzed data collected between April 2007 and December 2012 in our prospective registry. All acute ischemic stroke patients with an arterial occlusion treated by IA rt-PA (± IV, ± thrombectomy) were included. Arterial status was monitored with conventional angiography during the IA procedure. The primary study outcome was a complete recanalization achieved immediately after termination of IA rt-PA infusion. Secondary outcomes included complete recanalization after the end of the endovascular therapy (including complete recanalization achieved after adjunctive thrombectomy), favorable outcome (90-day modified Rankin Score ?2), 90-day all-cause mortality, and any intracerebral hemorrhage. Results Among the 227 included patients, 18.5% (n = 42) were current smokers and 16.7% (n = 38) former smokers. Compared with nonsmokers, current smokers were younger, more often men, had less frequently hypertension, and cardioembolic etiology, whereas former smokers were more often men and had more frequently hypercholesterolemia. The rate of complete recanalization was 30% (n = 68) after IA rt-PA infusion and 49% after adjunctive thrombectomy. A higher complete recanalization rate was found both in current smokers (45.2%) and former smokers (42.1%) compared to nonsmokers (22.5%). After adjustment for potential confounders, the adjusted odds ratio (OR) for complete recanalization associated with ever-smokers was 2.51 [95% confidence interval (CI) 1.26-4.99; p = 0.009]. A similar adjusted OR was found when the complete recanalization achieved after thrombectomy was included (OR 2.18, 95% CI 1.13-4.19; p = 0.019). However, smoking status was not independently associated with favorable outcome (adjusted OR 1.41, 95% CI 0.62-3.22 for former smokers, and adjusted OR 1.35, 95% CI 0.59-3.05 for current smokers), 90-day all-cause mortality (adjusted OR 0.68, 95% CI 0.25-1.81 for former smokers, and adjusted OR 1.55, 95% CI 0.54-4.48 for current smokers) or intracerebral hemorrhage (adjusted OR 0.72, 95% CI 0.29-1.76 for former smokers, and adjusted OR 0.80, 95% CI 0.32-1.96 for current smokers). Conclusions IA rt-PA administration was more effective to achieve complete arterial recanalization in current as well as former smokers. The characterization of the smoking paradox pathophysiology may lead to the identification of a patient-target population with a favorable response to rt-PA therapy. However, the smoking paradox should not be misinterpreted and not be used to promote smoking. PMID:24926305

Meseguer, Elena; Labreuche, Julien; Gonzalez-Valcarcel, Jaime; Sirimarco, Gaia; Guidoux, Céline; Cabrejo, Lucie; Lavallee, Philippa C.; Klein, Isabelle F.; Amarenco, Pierre; Mazighi, Mikaël

2014-01-01

57

Transsinusoidal Portal Vein Embolization with Ethylene Vinyl Alcohol Copolymer (Onyx): A Feasibility Study in Pigs  

SciTech Connect

Purpose: Portal vein embolization is performed to increase the future liver remnant before liver surgery in patients with liver malignancies. This study assesses the feasibility of a transsinusoidal approach for portal vein embolization (PVE) with the ethylene vinyl alcohol copolymer, Onyx. Methods: Indirect portography through contrast injection in the cranial mesenteric artery was performed in eight healthy pigs. Onyx was slowly injected through a microcatheter from a wedged position in the hepatic vein and advanced through the liver lobules into the portal system. The progression of Onyx was followed under fluoroscopy, and the extent of embolization was monitored by indirect portography. The pigs were euthanized immediately (n = 2), at 7 days (n = 4), or at 21 days postprocedure (n = 2). All pigs underwent necropsy and the ex vivo livers were grossly and histopathologically analyzed. Results: Transsinusoidal PVE was successfully performed in five of eight pigs (63%). In 14 of 21 injections (67%), a segmental portal vein could be filled completely. A mean of 1.6 liver lobes per pig was embolized (range 1-2 lobes). There were no periprocedural adverse events. Focal capsular scarring was visible on the surface of two resected livers, yet the capsules remained intact. Histopathological examination showed no signs of recanalization or abscess formation. Mild inflammatory reaction to Onyx was observed in the perivascular parenchyma. Conclusions: The porcine portal vein can be embolized through injection of Onyx from a wedged position in the hepatic vein. Possible complications of transsinusoidal PVE and the effect on contralateral hypertrophy need further study.

Smits, Maarten L. J., E-mail: m.l.j.smits-3@umcutrecht.nl [University Medical Center Utrecht, Department of Radiology (Netherlands); Vanlangenhove, Peter, E-mail: peter.vanlangenhove@uzgent.be; Sturm, Emiel J. C., E-mail: ejcsturm@gmail.com [Ghent University Hospital, Department of Vascular and Interventional Radiology (Belgium); Bosch, Maurice A. A. J. van den, E-mail: mbosch@umcutrecht.nl [University Medical Center Utrecht, Department of Radiology (Netherlands); Hav, Monirath, E-mail: hav.monirath@gmail.com; Praet, Marleen, E-mail: marleen.praet@ugent.be [Ghent University Hospital, N. Goormaghtigh Institute of Pathology (Belgium); Vente, Maarten A. D., E-mail: m.vente@umcutrecht.nl [University Medical Center Utrecht, Department of Radiology (Netherlands); Snaps, Frederic R., E-mail: fsnaps@ulg.ac.be [University of Liege, Department of Clinical Sciences, Faculty of Veterinary Medicine (Belgium); Defreyne, Luc, E-mail: luc.defreyne@ugent.be [Ghent University Hospital, Department of Vascular and Interventional Radiology (Belgium)

2012-10-15

58

Radiofrequency Guide Wire Recanalization of Venous Occlusions in Patients with Malignant Superior Vena Cava Syndrome  

SciTech Connect

Fibrotic central venous occlusions in patients with thoracic malignancy and prior radiotherapy can be impassable with standard catheters and wires, including the trailing or stiff end of a hydrophilic wire. We report two patients with superior vena cava syndrome in whom we successfully utilized a radiofrequency guide wire (PowerWire, Baylis Medical, Montreal, Quebec, Canada) to perforate through the occlusion and recanalize the occluded segment to alleviate symptoms.

Davis, Robert M.; David, Elizabeth; Pugash, Robyn A.; Annamalai, Ganesan, E-mail: ganesan.annamalai@sunnybrook.ca [Sunnybrook Health Sciences Centre, Department of Interventional Radiology (Canada)

2012-06-15

59

Salpingitis Isthmica Nodosa: Technical Success and Outcome of Fluoroscopic Transcervical Fallopian Tube Recanalization  

SciTech Connect

Purpose: To evaluate the technical success and outcome of fallopian tube recanalization (FTR) in salpingitis isthmica nodosa (SIN). Methods: SIN is a well-recognized pathological condition affecting the proximal fallopian tube and is associated with infertility and ectopic pregnancy. We reviewed the presentations, films, and case records of all patients attending for FTR for infertility from 1990 to 1994. Technical success and total, intrauterine, and ectopic pregnancy rates at follow-up were determined. Results: SIN was observed in 22 of 349 (6%) patients. FTR was attempted in 34 tubes in these 22 patients. Technical success was achieved in 23 of 34 (68%) tubes affected by SIN. In 5 of the 11 failed recanalizations, failure was due to distal obstruction. At least one tube was patent on selective postprocedural salpingography in 17 of 22 (77%) patients. There were no recorded perforations or complications. At follow-up (mean 14 months), total, intrauterine, and ectopic pregnancy rates were 23%, 18%, and 4.5%, respectively. Conclusion: FTR in SIN is technically successful and, compared with previously reported results in unselected infertility patients, is associated with only a slightly less favorable intrauterine pregnancy rate and a comparable ectopic pregnancy rate. The findings of SIN at FTR should not discourage attempted fluoroscopic transcervical recanalization.

Houston, J. Graeme; Machan, Lindsay S. [Department of Radiology, University Site, Vancouver Hospital, Vancouver, BC, V6T 1Z3 (Canada)

1998-01-15

60

Recurrent varicose veins  

Microsoft Academic Search

When Doppler ultrasound was introduced for the assessment of patients with varicose veins, a more accurate clinical appraisal of the pathophysiology of this condition became possible. In particular, it enabled identification of those patients with recurrent varicose veins who had had inappropriate or inadequate initial treatment. It facilitated planning of appropriate further treatment.

John P. Royle

1986-01-01

61

Major peripheral veins injuries.  

PubMed

The injury was severe in wounded limb patients of this series who suffered from an associated major peripheral vein trauma. The presence of such an injury weighed heavily on the prognosis. Thirty eight patients with major peripheral veins injuries are reviewed. The injury had resulted from war wounds, work or road accidents. The superficial femoral vein was the most frequently injured vein. Associated injuries were frequently noted: soft tissues injuries in 35 patients, fractures in 33, arterial injuries in 32 and peripheral nerve injuries in 22 patients. Shock was more often present and more severe in patients who suffered also from a vein injury than in patients with an arterial injury only. The lacerated femoral vein was ligated in the majority of patients. Attempts were made to repair the lacerated popliteal veins. Repair of the vein was usually done by anastomosis of debrided ends. When an arterial injury was also present, it was repaired first. The postoperative complications were frequent and included infections, thrombophlebitis and pulmonary embolisations. Twenty four patients were discharged with a viable limb. Complete function was recovered in seven patients only. Partial neurological deficit remained in twelve patients and complete paralysis in five. Twelve patients underwent subsequent amputation of the injured limb. Indications for amputation were ischemia in eight, infection or extensive destruction of tissues in four. Two patients died. PMID:961040

Romanoff, H; Goldberger, S

1976-01-01

62

Vein graft failure.  

PubMed

After the creation of an autogenous lower extremity bypass graft, the vein must undergo a series of dynamic structural changes to stabilize the arterial hemodynamic forces. These changes, which are commonly referred to as remodeling, include an inflammatory response, the development of a neointima, matrix turnover, and cellular proliferation and apoptosis. The sum total of these processes results in dramatic alterations in the physical and biomechanical attributes of the arterialized vein. The most clinically obvious and easily measured of these is lumen remodeling of the graft. However, although somewhat less precise, wall thickness, matrix composition, and endothelial changes can be measured in vivo within the healing vein graft. Recent translational work has demonstrated the clinical relevance of remodeling as it relates to vein graft patency and the systemic factors influencing it. By correlating histologic and molecular changes in the vein, insights into potential therapeutic strategies to prevent bypass failure and areas for future investigation are explored. PMID:24095042

Owens, Christopher D; Gasper, Warren J; Rahman, Amreen S; Conte, Michael S

2015-01-01

63

Deep Vein Thrombosis  

MedlinePLUS

... also called blood thinners) such as warfarin or heparin. Anticoagulants thin your blood so that clots won' ... form. Warfarin is taken as a pill and heparin is given intravenously (in your veins). If you ...

64

Portal vein thrombosis during eltrombopag treatment for immune thrombocytopenic purpura in a patient with liver cirrhosis due to hepatitis C viral infection.  

PubMed

Portal vein thrombosis is a rare, aggressive and life-threatening complication of liver cirrhosis (LC). Eltrombopag is effective for the treatment of chronic hepatitis with thrombocytopenia, and portal vein thrombosis at this time has rarely been reported. We describe the case of a 78-year-old woman who suffered from LC due to hepatitis C viral infection. The patient developed immune thrombocytopenic purpura (ITP) that was diagnosed on the basis of nasal bleeding, progressive severe thrombocytopenia, elevation of platelet-associated IgG (PAIgG), no response to the transfusion of platelets and no abnormal findings on bone marrow biopsy. Although we first administered prednisolone (0.5 mg/kg/day), there was no recovery of platelet function and the nasal bleeding persisted. Subsequently, we administered eltrombopag for refractory ITP at a dose of 12.5 mg/day, and the thrombocytopenia gradually improved. Fifty-four days after the start of eltrombopag therapy, she developed portal vein thrombosis. Eltrombopag was stopped immediately, and antithrombin III was administered for prophylaxis against further portal vein thrombosis. Despite these treatments, there were subsequent deep vein and pulmonary artery thromboses. We then administered heparin for recanalization of the thrombi. One month after the initiation of heparin, there was recanalization as well as improvements of the portal vein, deep vein and pulmonary artery thromboses. There was no further thrombosis progression after switching from heparin to warfarin therapy. Our case suggests that eltrombopag may increase the risk of portal vein thrombosis ; therefore, this drug must be used carefully in the treatment of ITP in patients with LC due to hepatitis C viral infection. PMID:23995112

Kawano, Noriaki; Hasuike, Satoru; Iwakiri, Hisayoshi; Nakamura, Kenichi; Ozono, Yoshinori; Kusumoto, Hisanori; Nagata, Kenji; Kikuchi, Ikuko; Yoshida, Shuro; Kuriyama, Takuro; Yamashita, Kiyoshi; Muranaka, Takahiro; Kawaguchi, Takumi; Sata, Michio; Okamura, Takashi; Ueda, Akira; Shimoda, Kazuya

2013-01-01

65

Elective versus deferred stenting following subintimal recanalization of coronary chronic total occlusions.  

PubMed

Subintimal tracking and re-entry (STAR) technique has been described as a bailout strategy for coronary total occlusion (CTO) recanalization. However, the length of the dissected segment represents a major concern. The aim of this study is, to evaluate whether "deferred" stent implantation may limit the total stent length following STAR recanalization of CTO. All consecutive patients with CTO in a native coronary artery treated by successful STAR technique in our institution were included. In the first period (March 2004-December 2009) all procedures were completed with stent implantation (Elective Stent Group; n?=?60). Thereafter (January 2010-June 2012) stent implantation was postponed until a scheduled (within 3 months) angiographic follow-up (Deferred Stent Group; n?=?69). The dissection length was 75?±?37 mm in the Elective Stent Group and 83?±?31 mm in the Deferred Stent Group (P?=?0.22). In the Deferred Stent Group, at the angiographic follow-up, the dissection length was significantly shorter than at the index procedure (40?±?35 mm versus 83?±?31 mm, P <0.001). The total stent length was significantly shorter in the Deferred Stent Group versus the Elective Stent Group (22?±?33 mm versus 56?±?28 mm; P?recanalization (1) limits the stent length and (2) is associated with a lower rate of objective endpoints. © 2014 Wiley Periodicals, Inc. PMID:24740711

Visconti, Gabriella; Focaccio, Amelia; Donahue, Michael; Briguori, Carlo

2015-02-15

66

Recanalization of Aged Venous Thrombotic Occlusions with the Aid of a Rheolytic System: An Experimental Study  

SciTech Connect

Purpose: The suitability of a rheolytic system for recanalization of aged venous thrombotic occlusions was tested in an animal experiment. Methods: The system consists of a flush-suction catheter and a high-pressure liquid pump. Thrombosis was experimentally induced in 13 venous segments of 10 adult goats. Results: After a mean period of 12 days, a complete thrombectomy using the flush-suction system was achieved in 12 cases. No complications such as perforation or dissection were observed. Conclusion: This system seems to be an appropriate device for percutaneous transluminal venous thrombectomy, even in older occlusions.

Vicol, Calin; Dalichau, Harald [Clinic for Thoracic and Cardiovascular Surgery, Georg-August-University Goettingen, Robert-Koch-Str. 40, D-37075 Goettingen (Germany)

1996-04-15

67

Recanalization of human arteries using Nd-YAG laser carried by optical fibre.  

PubMed

Nd-NAG laser carried by optical fibres 0.2 mm diameter was used in experimental studies to recanalize obstructed human cadaver arteries. Successful perforation of atheromatous plaques was obtained in all cases with a power of 12 W and a duration of exposure of 30-50 s provided that blood and not saline was used. The arterial wall was protected from injury by coaxial position of the optical fibre that was inserted into an inflated balloon catheter, and by circulating blood that cooled the system. The feasibility of guiding these devices in man was demonstrated in femoral and coronary arteries. PMID:6503253

Geschwind, H; Boussignac, G; Teisseire, B; Benhaiem, N; Laurent, D

1984-10-01

68

Diagnosis of deep vein thrombosis, and prevention of deep vein thrombosis recurrence and the post-thrombotic syndrome in the primary care medicine setting anno 2014  

PubMed Central

The requirement for a safe diagnostic strategy of deep vein thrombosis (DVT) should be based on an overall objective post incidence of venous thromboembolism (VTE) of less than 1% during 3 mo follow-up. Compression ultrasonography (CUS) of the leg veins has a negative predictive value (NPV) of 97%-98% indicating the need of repeated CUS testing within one week. A negative ELISA VIDAS safely excludes DVT and VTE with a NPV between 99% and 100% at a low clinical score of zero. The combination of low clinical score and a less sensitive D-dimer test (Simplify) is not sensitive enough to exclude DVT and VTE in routine daily practice. From prospective clinical research studies it may be concluded that complete recanalization within 3 mo and no reflux is associated with a low or no risk of PTS obviating the need of MECS 6 mo after DVT. Partial and complete recanalization after 3 to more than 6 mo is usually complicated by reflux due to valve destruction and symptomatic PTS. Reflux seems to be a main determinant for PTS and DVT recurrence, the latter as a main contributing factor in worsening PTS. This hypothesis is supported by the relation between the persistent residual vein thrombosis (RVT = partial recanalization) and the risk of VTE recurrence in prospective studies. Absence of RVT at 3 mo post-DVT and no reflux is predicted to be associated with no recurrence of DVT (1.2%) during follow-up obviating the need of wearing medical elastic stockings and anticoagulation at 6 mo post-DVT. The presence or absence of RVT but with reflux at 3 to 6 mo post-DVT is associated with both symptomatic PTS and an increased risk of VTE recurrence in about one third in the post-DVT period after regular discontinuation of anticoagulant treatment. To test this hypothesis we designed a prospective DVT and postthrombotic syndrome (PTS) Bridging the Gap Study by addressing at least four unanswered questions in the treatment of DVT and PTS. Which DVT patient has a clear indication for long-term compression stocking therapy to prevent PTS after the initial anticoagulant treatment in the acute phase of DVT? Is 3 mo the appropriate point in time to determine candidates at risk to develop DVT recurrence and PTS? Which high risk symptomatic PTS patients need extended anticoagulant treatment?

Michiels, Jan Jacques; Michiels, Janneke Maria; Moossdorff, Wim; Lao, Mildred; Maasland, Hanny; Palareti, Gualtiero

2015-01-01

69

Efficacy of Salpingography and Transcervical Recanalization in Diagnosis, Categorization, and Treatment of Fallopian Tube Obstruction  

SciTech Connect

Purpose: The efficacy of selective salpingography (SS) and transcervical recanalization (TCR) in diagnosis, categorization, and determination of optimal treatment modality for fallopian tube obstruction was investigated.Methods: SS and, in some patients, TCR was performed in 430 patients with a diagnosis of obstruction of one or both fallopian tubes, as determined by hysterosalpingograms (HSG). All patients (age 21-46 years) had an infertility problem for at least 18 months.Results: In 196 patients, 325 tubes were patent on SS. TCR recanalized 243 tubes in 176 patients. Disease of the distal tube was demonstrated in 66 patients. There were 39 live babies in a group of 176 patients with successful TCR. Best live birth rate was in 7 of 12 (58%) patients with underlying endometriosis, followed by postsurgical strictures in inflammatory disease, 6 of 31 (19%), and salpingitis isthmica nodosa in 25 of 168 (15%). There were no pregnancies in patients with cobblestone pattern of the distal tubes.Conclusions: SS and TCR were capable of correcting obstruction of the proximal tubes in 243 of 465 tubes in 176 of 234 patients (75%). With patency of the proximal tube restored, the distal tube could be assessed for changes indicative of damage to the ciliated epithelium which was likely to reduce the ability to become pregnant. This allowed for the triage of patients into groups benefiting from the relatively inexpensive and low complication TCR or patients in need of in vitro fertilization or similar assisted reproductive technologies.

Lang, Erich K. [Department of Radiology, Tulane Medical Center, 1430 Tulane Avenue, SL 54, New Orleans, LA 70112 (United States); Dunaway, Herbert E. [Division of Reproductive Gynecology, 4700 I-10 Service Road, Lakeside Hospital, Metairie, LA 70008 (United States)

2000-11-15

70

[Experimental studies of intrahepatic portal vein embolization and embolic materials].  

PubMed

The author has developed the intrahepatic portal vein embolization for the treatment of liver cancers. The purposes of this new method are 1) extension of indications for surgery by causing compensatory hypertrophy of non-embolized lobe, 2) prevention of dissemination of the tumor cells via the portal vein, 3) causing complete ischemic necrosis of the tumor together with arterial embolization, and 4) blockade of centripetal extension of tumor thrombus. The feasibility and safety of this method were studied experimentally. Three kings of materials were prepared for embolization of the portal vein; a Lipiodol-thrombin mixture (Lp-T), a Lipiodol-fibrin adhesive mixture (Lp-F), and a mixture of Lipiodol with isobutyl-2-cyanoacrylate (Lp-IBC). The portal vein was embolized in 31 dogs, 6 with Lp-T, 14 with Lp-F, and 11 with Lp-IBC. Lp-F was used 30 to 90 seconds after preparation, which had been found to be best in an in vitro study. Lp-T and Lp-IBC could be used at any time after preparation. Embolization was done safely and reliably, except in two cases of Lp-F, by use of a balloon catheter for Lp-T or Lp-F and a coaxial catheter for Lp-IBC. Follow-up portography showed recanalization in one week in the dogs embolized with Lp-T. The obstruction was maintained for two to four weeks in the dogs embolized with Lp-F, and for four weeks in all dogs embolized with Lp-IBC. Damage in the liver was slight both macroscopically and histologically. Changes in liver function and elevation of the pressure of the portal vein were transient. The author concluded that the intrahepatic portal vein embolization was both feasible and safe when the materials tested were used, and could be an effective method for liver cancers. In clinical cases, Lp-T would be suitable for short-term occlusion, Lp-F for a moderate term, and Lp-IBC for long-term. The material should be selected with regard to the purpose. PMID:2552401

Matsuoka, T

1989-05-25

71

Portal Vein Thrombosis.  

PubMed

Portal vein thrombosis (PVT) is a rare event in the general medical setting that commonly complicates cirrhosis with portal hypertension, and can also occur with liver tumors. The diagnosis is often incidental when a thrombus is found in the portal vein on imaging tests. However, PVT may also present with clinical symptoms and can progress to life-threatening complications of ischemic hepatitis, liver failure, and/or small intestinal infarction. This article reviews the pathophysiology of this disorder, with a major focus on PVT in patients with cirrhosis, and presents detailed guidelines on optimal diagnostic and therapeutic strategies. PMID:25454305

Basit, Syed Abdul; Stone, Christian D; Gish, Robert

2015-02-01

72

Epidemiology of varicose veins  

Microsoft Academic Search

The prevalence rate of varicose veins in adults varies from less than 1% in lowland New Guinea women to over 50% in women in south Wales. Within populations the prevalence increases with age, is generally greater in women, is directly related to body mass, has an inconsistent relationship with occupation, and usually increases with increasing parity. None of these factors

Robert Beaglehole

1986-01-01

73

Final infarct volume estimation on 1-week follow-up MR imaging is feasible and is dependent on recanalization status  

PubMed Central

Purpose We aim to characterize infarct volume evolution within the first month post-ischemic stroke and to determine the effect of recanalization status on early infarct volume estimation. Methods Ischemic stroke patients recruited for the MONITOR and VISION studies were retrospectively screened and patients who had infarcts on diffusion-weighted imaging (DWI) at baseline and had at least two follow-up MR scans (n = 56) were included. Pre-defined target imaging time points, obtained on a 3-T MR scanner, were 12 hours (h), 24 h, 7 days, and ?30 days post-stroke. Infarct tissue was manually traced blinded to the images at the other time points. Infarct expansion index was calculated by dividing infarct volume at each follow-up time point by the baseline DWI infarct volume. Recanalization was assessed within 24 h post-stroke. Correlation and statistical comparison analysis were done using the Spearman, Mann–Whitney, and Kruskal–Wallis tests. Results Follow-up infarct volumes were positively correlated with the baseline infarct volume (? > 0.81; p < 0.001) where the strongest correlation existed between baseline and 7-day post-stroke infarct volumes (? = 0.92; p < 0.001). The strongest correlation among the follow-up imaging was found between infarct volumes 7-day post-stroke and ?30-day time points (? = 0.93; p < 0.001). Linear regression showed a close-to unity slope between 7-day and final infarct volumes (slope = 1.043; p < 0.001). Infarct expansion was higher in the non-recanalized group than the recanalized group at the 7-day (p = 0.001) and ?30-day (p = 0.038) time points. Conclusions Final infarct volume can be approximated as early as 7 days post-stroke. Final infarct volume approximation is significantly associated with recanalization status. PMID:25429356

Krongold, Mark; Almekhlafi, Mohammed A.; Demchuk, Andrew M.; Coutts, Shelagh B.; Frayne, Richard; Eilaghi, Armin

2014-01-01

74

Percutaneous Recanalization of Coronary Chronic Total Occlusions: Current Devices and Specialized Wire Crossing Techniques  

PubMed Central

Treatment of coronary chronic total occlusions (CTOs) remains a challenging obstacle, posing a considerable barrier to achieving successful complete revascularization. By nature of their complexity, percutaneous CTO interventions are associated with lower rates of procedural success, higher complication rates, greater radiation exposure and longer procedure times compared with non-CTO interventions. In the last few years, development in guidewires, devices and the emergence of new techniques from Japanese centers resulted in higher success rates in the hands of experienced operators. The impact of drug eluting stents on restenosis has improved long-term outcomes after successful recanalization. Successful revascularization is associated with improved long-term survival, reduced symptoms, improved left ventricular function and reduced need for coronary bypass surgery. This paper reviews the current devices and specialized crossing techniques of percutaneous intervention to relieve CTOs. PMID:20514329

2010-01-01

75

Lattice Boltzmann method simulating hemodynamics in the three-dimensional stenosed and recanalized human carotid bifurcations  

NASA Astrophysics Data System (ADS)

By using the lattice Boltzmann method (LBM) pulsatile blood flows were simulated in three-dimensional moderate stenosed and recanalized carotid bifurcations to understand local hemodynamics and its relevance in arterial atherosclerosis formation and progression. The helical flow patterns, secondary flow and wall dynamical pressure spatiotemporal distributions were investigated, which leads to the disturbed shear forces in the carotid artery bifurcations. The wall shear stress distributions indicated by time-averaged wall shear stress (TAWSS), oscillatory shear index (OSI), and the relative residence time (RRT) in a cardiac cycle revealed the regions where atherosclerotic plaques are prone to form, extend or rupture. This study also illustrates the point that locally disturbed flow may be considered as an indicator for early atherosclerosis diagnosis. Additionally the present work demonstrates the robust and highly efficient advantages of the LBM for the hemodynamics study of the human blood vessel system.

Kang, XiuYing

2015-01-01

76

Liver Transplantation in the Presence of Old Portal Vein Thrombosis  

PubMed Central

Background: Portal vein thrombosis (PVT) has been mentioned as a potential obstacle to liver transplantation (LTx). Objective: To review the impact of PVT on orthotopic liver transplant (OLT) outcome. Method: Between January 2006 and April 2009, 440 OLT were performed in Shiraz Transplant Unit of whom, 35 (7.9%) cases had old PVT with recanalization. Data were retrospectively collected regarding the demographics, indication for OLT, Child-Turgot-Pugh classification, pre-transplant diagnosis of PVT, perioperative course and managements, relapse of PVT, early post-operative mortality and morbidity. All patients received liver from deceased donors, underwent thrombendvenectomy with end-to-end anastomosis without interposition graft and evaluated daily for 5 days and thereafter, biweekly by duplex sonography during the follow-up period for 2 months. They were treated by therapeutic doses of heparin followed by warfarin to maintain an INR of 2–2.5. Results: The causes of end-stage liver disease were hepatitis B in 11, cryptogenic cirrhosis in 11, primary sclerosing cholangitis in 5 and other causes in 8 recipients. Extension of thrombosis was through confluence of superior mesenteric and splenic vein in 32 and to superior mesenteric vein in 3 patients. The mean±SD operation time was 7.2±1.5 hrs. The mean±SD transfusion requirement was 5.4±2.8 units of packed cells. The mean±SD duration of hospital stay in these patients was 17.7±10.9 days. Eight patients died; 1 developed early in-hospital PVT, 1 had hepatic vein thrombosis, and 1 died of in-hospital ischemic cerebrovascular accident, despite a full anticoagulant therapy. The mean±SD follow-up period for those 28 patients discharged from hospital was 16.6±7.9 months; none of them developed relapse of PVT. The overall mortality and morbidity was 28% and 32%, respectively. There was no relapse of PVT in the other patients. Conclusion: The presence of PVT at the time of OLT is not a contraindication for the operation but those with PVT have a more difficult surgery, develop more postoperative complications, and experience a higher in-hospital mortality. PMID:25013563

Kakaei, F.; Nikeghbalian, S.; Salahi, H.; Bahador, A.; Kazemi, K.; Dehghani, M.; Shamsaeefar, A.; Sanei, B.; Ghaffaripour, S.; Rajaei, E.; Gholami, S.; Malek-Hosseini, S. A.

2010-01-01

77

Spontaneous Recanalization of Occluded Dural Venous Sinuses after Successful Trans Arterial Embolisation of a Dural Arteriovenous Shunt  

PubMed Central

Summary Dural arteriovenous shunts (DAVS) occur within the walls of dural venous sinuses or their tributaries. They may be related to previous episodes of sinus thrombosis. The presence of impediments to venous outflow results in venous congestion, predisposing to haemorrhage and cerebral parenchymal damage. Cerebral venous congestion is an indication for treatment. This case is unusual in some respects; firstly, the patient was relatively well despite worrisome features on imaging and secondly the occluded dural venous sinuses appeared to spontaneously recanalize after treatment of the DAVS. Anticoagulation may have had a role in avoiding thrombosis of the patient's precarious venous drainage after embolisation and in encouraging recanalization of the thrombosed dural venous sinuses. PMID:20594510

Brew, S.; Taylor, W.; Lasjaunias, P.

2002-01-01

78

Percutaneous Transhepatic Portography for the Treatment of Early Portal Vein Thrombosis After Surgery  

SciTech Connect

We treated three cases of early portal vein thrombosis (PVT) by minimally invasive percutaneous transhepatic portography. All patients developed PVT within 30 days of major hepatic surgery (one case each of orthotopic liver transplantation, splenectomy in a previous liver transplant recipient, and right extended hepatectomy with resection and reconstruction of the left branch of the portal vein for tumor infiltration). In all cases minimally invasive percutaneous transhepatic portography was adopted to treat this complication by mechanical fragmentation and pharmacological lysis of the thrombus. A vascular stent was also positioned in the two cases in which the thrombosis was related to a surgical technical problem. Mechanical fragmentation of the thrombus with contemporaneous local urokinase administration resulted in complete removal of the clot and allowed restoration of normal blood flow to the liver after a median follow-up of 37 months. PVT is an uncommon but severe complication after major surgery or liver transplantation. Surgical thrombectomy, with or without reconstruction of the portal vein, and retransplantation are characterized by important surgical morbidity and mortality. Based on our experience, minimally invasive percutaneous transhepatic portography should be considered an option toward successful recanalization of early PVT after major liver surgery including transplantation. Balloon dilatation and placement of a vascular stent could help to decrease the risk of recurrent thrombosis when a defective surgical technique is the reason for the thrombosis.

Adani, Gian Luigi, E-mail: adanigl@hotmail.com; Baccarani, Umberto; Risaliti, Andrea [University Hospital of Udine, Department of Surgery and Transplantation (Italy); Sponza, Massimo; Gasparini, Daniele [University Hospital of Udine, Department of Interventional Radiology (Italy); Bresadola, Fabrizio; Anna, Dino de; Bresadola, Vittorio [University Hospital of Udine, Department of Surgery and Transplantation (Italy)

2007-11-15

79

Complex recanalization techniques for complex femoro-popliteal lesions: how to optimize outcomes.  

PubMed

Complex lesions within the femoro-popliteal vascular territory, amongst others, include more than 15 cm long or heavily calcified occlusions of the superficial femoral artery (SFA) or total occlusions of the popliteal artery (PA). For those type-C/-D lesions TASC-II recommendations originating from 2007 advocate bypass surgery as the therapy of choice if the patient is a suitable candidate for this. Against the background of evolving endovascular techniques which often allow recanalization of even long and calcified lesions as well as improved patency rates after endovascular treatment of such complex lesions, many vascular specialists go for an endovascular-first approach for the treatment of challenging lesions, last but not least in those patients unfit for surgery or in those lacking an adequate conduit or distal target vessel segment. This review focuses on two important aspects of treating complex femoro-popliteal lesions by an endovascular approach. The first part covers techniques to pass a complex lesion with a guidewire, while the second discusses strategies to improve the outcome of the endovascular reconstruction in terms of patency and clinical success. PMID:25335942

Goltz, J P; Kleemann, M

2015-02-01

80

Recurrent varicose veins following high ligation of long saphenous vein: a duplex ultrasound study  

Microsoft Academic Search

Duplex scanning was used to study recurrent varicose veins in 244 limbs with previous high ligation of the long saphenous vein. The recurrent varicose veins were classified into two types according to the presence or absence of a residual long saphenous vein. Varicose veins with a residual long saphenous vein (type I) occurred in 168 limbs (68.9%). A residual long

Y. Tong; J. Royle

1995-01-01

81

Infrared imaging of varicose veins  

NASA Astrophysics Data System (ADS)

It has been established that varicose veins are better visualized with infrared photography. As near-infrared films are nowadays hard to get and to develop in the digital world, we investigated the use of digital photography of varicose veins. Topics that are discussed are illumination setup, photography and digital image enhancement and analysis.

Noordmans, Herke Jan; de Zeeuw, Raymond; Verdaasdonk, Ruud M.; Wittens, Cees H. A.

2004-06-01

82

A novel technique to recanalize the nasolacrimal duct with endodiathermy bipolar probe  

PubMed Central

Aims: To evaluate a new approach for recanalization (RC) of nasolacrimal duct obstruction in the treatment of the symptomatic nasolacrimal duct obstruction (NLDO). Materials and Methods: A prospective, interventional, comparative study in 302 eyes of 209 patients of symptomatic nontraumatic NLDO. Eyes with previous failed surgery were excluded. One hundred and fifty-one eyes underwent RC with 20 G endodiathermy bipolar probe connected to a 7 W diathermy followed by bicanalicular intubation under direct visualization. One hundred and fifty-one eyes underwent standard external dacryocystorhinostomy (DCR). Follow-up was for 24 months and evaluation was done on basis of change in symptoms and lacrimal syringing. Data was analyzed by Chi-square test and unpaired t-test. P value < 0.05 was considered statistically significant. Results: Success defined as an asymptomatic patient or freely patent syringing was 92.7% (140 eyes) in RC group and 83.44% (126 eyes) in DCR group. Success was significantly more (P ? 0.01) in RC than DCR group. Surgical time was significantly less in RC than DCR (P ? 0.001). In RC group, RC could not be performed in three eyes and had to be later taken up for DCR. Intubation after RC was not achieved in four eyes; however these eyes had a patent pathway till 24 months. Twenty-two eyes had a premature extrusion of the tube; but the success rate in these (20 eyes) was comparable to the others within the group (P > 0.05). Two eyes in RC and one in DCR group had complications. Conclusions: RC with 20 G endodiathermy bipolar probe is a quick, simple, and effective alternative to standard external DCR. PMID:24212227

Agrawal, Siddharth; Gupta, Sanjiv K; Singh, Vinita; Agrawal, Saurabh

2013-01-01

83

Vein matching using artificial neural network in vein authentication systems  

NASA Astrophysics Data System (ADS)

Personal identification technology as security systems is developing rapidly. Traditional authentication modes like key; password; card are not safe enough because they could be stolen or easily forgotten. Biometric as developed technology has been applied to a wide range of systems. According to different researchers, vein biometric is a good candidate among other biometric traits such as fingerprint, hand geometry, voice, DNA and etc for authentication systems. Vein authentication systems can be designed by different methodologies. All the methodologies consist of matching stage which is too important for final verification of the system. Neural Network is an effective methodology for matching and recognizing individuals in authentication systems. Therefore, this paper explains and implements the Neural Network methodology for finger vein authentication system. Neural Network is trained in Matlab to match the vein features of authentication system. The Network simulation shows the quality of matching as 95% which is a good performance for authentication system matching.

Noori Hoshyar, Azadeh; Sulaiman, Riza

2011-10-01

84

Endovascular Treatment of In-Stent Occlusion: New Technique for Recanalization of Long Superficial Femoral Artery Occlusion (Direct Stent Puncture Technique)  

SciTech Connect

In-stent reocclusion is a frequent complication of endovascular treatment and stenting, especially in the superficial femoral artery. Neointimal hyperplasia is the main cause of this problem, but in many cases, it occurs as a result of the presence of stent strut fractures. The two treatment options are endovascular and surgical intervention. The effectiveness of endovascular interventions in patients with critical limb ischemia has been well established, but in some cases, crossing the occluded stent is difficult. We describe a new technique to recanalize long in-stent superficial femoral artery occlusions characterized by direct stent puncture, followed by retrograde-antegrade recanalization after antegrade failures.

Palena, Luis Mariano, E-mail: marianopalena@hotmail.com; Cester, Giacomo; Manzi, Marco [Policlinico Abano Terme, Interventional Radiology Unit (Italy)

2012-04-15

85

Absence of retromandibular vein associated with atypical formation of external jugular vein in the parotid region  

PubMed Central

Veins of the head and neck exhibiting anatomical variations or malformations are clinically significant. Anatomical variation in the external jugular vein is very common. However, anatomical variation in the retromandibular vein is rare. In this paper, we report a rare case of complete absence of the retromandibular vein. In the absence of the retromandibular vein, the maxillary vein divided into anterior and posterior divisions. The posterior division joined the superficial temporal vein to form an atypical external jugular vein, and the anterior division joined the facial vein to form an anonymous vein. In clinical practice, radiologists and surgeons use the retromandibular vein as a guide to expose the branches of the facial nerve during superficial parotidectomy. Therefore, absence of the retromandibular vein is a hurdle during this procedure and may affect the venous drainage pattern from the head and neck. PMID:24987551

Patil, Jyothsna; Swamy, Ravindra S.; D'Souza, Melanie R.; Guru, Anitha; Nayak, Satheesha B.

2014-01-01

86

Quartz Vein in the Gunsight Formation  

USGS Multimedia Gallery

Quartz vein in biotite-rich rock in the Gunsight Formation of the Mesoproterozoic Lemhi Group. Bluish green copper-bearing minerals coat the quartz vein. Pale pinkish cobalt bloom and white caliche coat adjacent biotite-rich wallrock....

87

Vascular Remodeling in Varicose Veins  

Microsoft Academic Search

The present study describes the histopathologic aspects of varicose (n=29; mean age, 52 ± 12 years) and normal saphenous veins (n=17; mean age, 51 ± 12 years) of patients from a similar age group. We focused on the changes that occur in the circular layer of the venous wall. We examined the venous walls by light microscopy and transmission electronmicroscopy.

Mark M. Kockx; Michiel W. M. Knaapen; Hilde E. Bortier; Kristel M. Cromheeke; Odile Boutherin-Falson; Michel Finet

1998-01-01

88

Combined Retrograde-Antegrade Arterial Recanalization Through Collateral Vessels: Redefinition of the Technique for Below-the-Knee Arteries  

SciTech Connect

The effectiveness of below-the-knee PTA to obtain successful revascularization in patients with critical limb ischemia (CLI) has been well established, and many centers have adopted endovascular intervention as the first-line treatment in patients with chronic lower-extremity disease. The well-known complex and multilevel arterial disease in patients with CLI have lead to interventionists to continuously implement different technologies and techniques. The aim of the present study was to standardize and redefine a technique characterized for combined retrograde-antegrade recanalization of a native leg artery through a collateral arterial branch by using a single access. This concept has been well described in coronary arteries and recently in pelvic and tibial arteries.

Graziani, L., E-mail: langrazi@tin.it; Morelli, L. G. [Istituto Clinico Citta di Brescia, Servizio di Emodinamica (Italy)

2011-02-15

89

What Are the Signs and Symptoms of Varicose Veins?  

MedlinePLUS

... Twitter. What Are the Signs and Symptoms of Varicose Veins? The signs and symptoms of varicose veins include: ... signs of other, more serious conditions. Complications of Varicose Veins Varicose veins can lead to dermatitis (der-ma- ...

90

[Embolotherapy of recanalized symptomatic pulmonary arteriovenous malformations in a patient with Rendu-Osler-Weber syndrome: a case report and review of literature].  

PubMed

Rendu-Osler-Weber disease is a genetic disorder resulting in mucosal and celiac angiodysplastic lesions. We present a case of a 47-year-old woman with Rendu-Osler-Weber disease manifesting with telangiectasias on the skin and mucosa of the face and pulmonary and hepatic arteriovenous malformations (AVMs). Due to cardiovascular and neurological (recurrent brain abscess) complications of pulmonary AVMs, the patient was qualified for the embolization of a recanalized AVM in the right lung. Endovascular embolotherapy is the method of choice in treatment of pulmonary AVMs allowing for avoidance of complications and prolonged survival. Due to the risk of recanalization of embolized AVMs, a long-term follow up is necessary. PMID:23276025

?ezak, Aleksandra; Su?kowska, Katarzyna; Palczewski, Piotr; Swietlik, Emilia; Doboszy?ska, Anna; Rowi?ski, Olgierd

2012-01-01

91

High Rate of Complete Recanalization and Dramatic Clinical Recovery During tPA Infusion When Continuously Monitored With 2MHz Transcranial Doppler Monitoring  

Microsoft Academic Search

Background and Purpose—Clot dissolution with tissue plasminogen activator (tPA) can lead to early clinical recovery after stroke. Transcranial Doppler (TCD) with low MHz frequency can determine arterial occlusion and monitor recanalization and may potentiate thrombolysis. Methods—Stroke patients receiving intravenous tPA were monitored during infusion with portable TCD (Multigon 500M; DWL MultiDop-T) and headframe (Marc series; Spencer Technologies). Residual flow signals

Andrei V. Alexandrov; Andrew M. Demchuk; Robert A. Felberg; Ioannis Christou; Philip A. Barber; W. Scott Burgin; Marc Malkoff; Anne W. Wojner; James C. Grotta

2010-01-01

92

Preduodenal portal vein: its surgical significance.  

PubMed

Preduodenal portal vein is a rare anatomical variant which may be one of many anomalies in the neonate with duodenal "atresia." Preduodenal portal vein also may be an occasional finding in an adult undergoing biliary, gastric, or pancreatic surgery. Awareness and recognition of the anomaly are essential for the avoidance of injury during such operations. We report here a symptomless patient whose preduodenal portal vein was discovered at cholecystectomy. PMID:715684

Makey, D A; Bowen, J C

1978-11-01

93

Jugular vein thrombosis associated with distant malignancy.  

PubMed Central

We describe two patients who developed internal jugular vein thrombosis associated with primary malignant disease arising outside the neck, and in one patient it was the presenting feature. Computed tomography was performed and the findings characteristic of internal jugular vein thrombosis are illustrated. We conclude that malignant disease should be considered in patients presenting with spontaneous internal jugular vein thrombosis with no other predisposing factors and that computed tomography is of value in confirming the diagnosis. Images Figure 1 Figure 2 PMID:3211826

Carrington, B. M.; Adams, J. E.

1988-01-01

94

The adrenal and renal veins of man and their connections with azygos and lumbar veins.  

PubMed Central

There exist many variations in the manner of formation, dimensions and place of termination of the central adrenal veins. In addition, some superficial adrenal veins may be substantial in size and may themselves drain directly into the renal veins and/or into other vessels which communicate with azygos and lumbar veins. This provides a route for venous adrenal blood to the heart via the azygos system and the superior vena cava rather than via the inferior vena cava. Variations in the formation and disposition of the renal veins are also described and the patterns of communication between somatic veins (including veins of the azygos and lumbar systems) and the left renal vein are illustrated and discussed in relation to the findings of others. Images Fig. 7 Fig. 8 Fig. 6 PMID:3693053

Monkhouse, W S; Khalique, A

1986-01-01

95

MR Venography for the Assessment of Deep Vein Thrombosis in Lower Extremities with Varicose Veins  

PubMed Central

Objective: To assess the performance of magnetic resonance venography (MRV) for pelvis and deep vein thrombosis in the lower extremities before surgical interventions for varicose veins. Materials and Methods: We enrolled 72 patients who underwent MRV and ultrasonography before stripping for varicose veins of lower extremities. All images of the deep venous systems were evaluated by time-of-flight MRV. Results: Forty-six patients (63.9%) of all were female. Mean age was 65.2 ± 10.2 years (37–81 years). There were forty patients (55.6%) with varicose veins in both legs. Two deep vein thrombosis (2.8%) and three iliac vein thrombosis (4.2%) were diagnosed. All patients without deep vein thrombosis underwent the stripping of saphenous veins, and post-thrombotic change was avoided in all cases. Conclusion: MRV, without contrast medium, is considered clinically useful for the lower extremity venous system. PMID:25593625

Nakahara, Hideki

2014-01-01

96

Idiopathic rupture of the iliac vein.  

PubMed

Idiopathic rupture of large veins is very rare. There has been one report in the Portugese literature of such an instance involving the iliac vein. Our patient was an elderly woman in whom evidence of intra-abdominal hemorrhage developed. There was no clinical evidence of trauma. At laparotomy a large retroperitoneal hematoma secondary to an 8-mm tear in the left common iliac vein was found. The tear occurred adjacent to where the right common iliac artery passes over the vein. Repair was followed by uneventful recovery. Results of the pathological examination showed nonspecific information. PMID:831681

Brown, L; Sanchez, F; Mannix, H

1977-01-01

97

Serotonin (5HT) in Veins: Not All in Vain  

Microsoft Academic Search

The circulatory system consists of veins and arteries. Com- pared with arteries, veins have been neglected in cardiovascu- lar research. Although veins are significantly less muscular than similarly sized arteries, the contribution of veins to cardiovas- cular homeostasis cannot be left un-noted because veins ac- commodate 70% of the circulating blood. Circulating blood platelets contain the majority of systemic 5-HT

A. Elizabeth Linder; Wei Ni; Jessica L. Diaz; Theodora Szasz; Robert Burnett; Stephanie W. Watts

2007-01-01

98

Arteries and veins of the zebra fish  

NSDL National Science Digital Library

Arteries and veins are blood vessels and are part of the circulatory system. Arteries take oxygenated blood away from the heart and veins bring blood back to the heart after it has circulated through the body. The circulatory system distributes oxygen to the body and also moves around nutrients.

Katie Hale (CSUF; Biological Sciences)

2007-06-19

99

Endovenous management of saphenous vein reflux  

Microsoft Academic Search

Purpose: This study assessed clinical outcomes of two catheter-based endovenous procedures to eliminate or greatly mitigate saphenous vein reflux. Materials and Methods: A computer-controlled, dedicated generator and two catheter designs were used to treat 210 patients at 16 private clinic and university centers in Europe. The Closure catheter applied resistive heating over long vein lengths to cause maximum wall contraction

Stefano Manfrini; Vincenzo Gasbarro; Gudmundur Danielsson; Lars Norgren; James G. Chandler; Andrew F. Lennox; Zaki A. Zarka; Andrew N. Nicolaides

2000-01-01

100

Element transport in veins during serpentinization  

NASA Astrophysics Data System (ADS)

Serpentinization of ultramafic rocks has wide ranging implications for the petrology, rheology, and petrophysical properties of the oceanic lithosphere. During hydration of the peridotite, fluid-rock ratios and temperature control mineral formation in the veins. We studied a partly serpentinized peridotite from the Santa Elena ophiolite complex in Costa Rica and tracked element mobility during water-rock interaction. Serpentinization of the studied harzburgite is around 30 to 40%, with serpentinization of olivine being more advanced than serpentinization of orthopyroxene. Element mapping and point analyses show that the veins preserve characteristic element distributions within orthopyroxene and olivine, and with distance to orthopyroxene-hosted serpentine veins. With increasing distance from the orthopyroxene the following vein assemblages were observed in olivine: pure serpentine veins, serpentine + brucite veins, serpentine + brucite + magnetite veins. Veins are enriched in SiO2 in the proximity of orthopyroxene suggesting that a net transfer of SiO2 takes place from serpentinizing orthopyroxene to olivine. The magnetite-bearing serpentine veins mostly consist of Mg-rich serpentine (Mg# = 90 - 95) and Fe-rich brucite (Mg# = 70 - 75) finely intergrown. In contrast, the center of these veins contains a thin zone of high-Mg serpentine (Mg# 97), and high-Mg brucite (Mg# 92 - 94) next to magnetite. We infer from thermodynamic calculations that these mineral assemblages are controlled by H2O activity and low SiO2 activities. Within orthopyroxene, serpentine (Mg# = 84 - 89) with an elevated Al2O3 content (< 4.14wt.%) was detected, but talc was absent, indicating net loss of SiO2 from orthopyroxene during serpentinization. CaO and Al2O3 migrate from orthopyroxene, but occur only as trace components in serpentine at > 100 ?m and > 200 ?m, respectively, from the orthopyroxene. We infer that brucite is not stable in close proximity to orthopyroxene due to elevated SiO2 derived from orthopyroxene breakdown. Orthopyroxene serpentinization results in net transfer of Al2O3 into serpentine, but only in the immediate vicinity of the orthopyroxene. Overall, our study indicates that the extent of orthopyroxene serpentinization controls SiO2 and Al2O3 availability in the fluid and therefore the mineral assemblages present in the veins. The net transfer of SiO2 is manifested by the lack of talc in serpentine veins in orthopyroxene and the lack of brucite in serpentine veins proximal to orthopyroxene grain boundaries. Within veins, local transport of Si, Mg and Fe takes place during reaction of serpentine + brucite with H2O to form magnetite + Mg-rich serpentine + Mg-rich brucite.

Schwarzenbach, E. M.; Beard, J. S.; Caddick, M. J.

2013-12-01

101

Multi-Modality Image Fusion to Guide Peripheral Artery Chronic Total Arterial Occlusion Recanalization in a Swine Carotid Artery Occlusion Model: Unblinding the Interventionalist!  

PubMed Central

Objectives To demonstrate the feasibility of magnetic resonance imaging (MRI) to x-ray fluoroscopy (XRF) image fusion to guide peripheral artery chronic total occlusion (CTO) recanalization. Background Endovascular peripheral artery CTO revascularization is minimally invasive, but challenging, because the occlusion is poorly visualized under XRF. Devices may steer out of the artery which can lead to severe perforation. Merging pre-acquired MRI of the CTO to the live XRF display may permit upfront use of aggressive devices and improve procedural outcomes. Methods Swine carotid artery CTO’s were created using a balloon injury model. Up to 8 weeks later, MRI of the carotid arteries was acquired and segmented to create 3D surface models, which were then registered onto live XRF. CTO recanalization was performed using incrementally aggressive CTO devices (Group A) or an upfront aggressive directed laser approach (Group B). Procedural success was defined as luminal or sub-intimal device position without severe perforation. Results In this swine model, MRI to XRF fusion guidance resulted in a procedural success of 57% in Group A and 100% in Group B, which compared favorably to 33% using XRF alone. Fluoroscopy time was significantly less for Group B (8.5 min ± 2.6 min) compared to Group A (48.7 min ± 23.9 min), p value<0.01. Contrast dose used was similar between Groups A and B. Conclusions MRI to XRF fusion guided peripheral artery CTO recanalization is feasible. Multi-modality image fusion may permit upfront use of aggressive CTO devices with improved procedural outcomes compared to XRF guided procedures. PMID:23097307

Klein, Andrew J.; Tomkowiak, Michael T.; Vigen, Karl K.; Hacker, Timothy A.; Speidel, Michael A.; VanLysel, Michael S.; Shah, Nehal; Raval, Amish N.

2012-01-01

102

Emergent Recanalization with Stenting for Acute Stroke due to Athero-Thrombotic Occlusion of the Cervical Internal Carotid Artery : A Single Center Experience  

PubMed Central

Objective The purpose of this study is to demonstrate the technical feasibility and clinical efficacy of emergent carotid angioplasty and stenting (CAS) for acute stroke due to athero-thrombotic occlusion of the cervical internal carotid artery (ICA). Methods Review of medical records identified 17 patients who underwent emergent CAS for treatment of athero-thrombotic occlusion of the cervical ICA with acute stroke between 2009 and 2013. Eleven patients (64.7%) presented with concomitant intracranial artery occlusion, which was treated primarily by mechanical thrombectomy after CAS. Results Successful revascularization of the cervical ICA with emergent CAS was achieved in all patients. After CAS, intracranial recanalization with Thrombolysis in Cerebral Infarction ?2b flow was achieved in four of the 11 patients (36.4%). The overall recanalization rate (cervical ICA and intracranial artery) was 10 of 17 patients (58.8%). Symptomatic intracranial hemorrhage occurred in two patients (11.8%), resulting in death. Ten patients (58.8%) showed improvement (decrease in NIHSS score of ?4 points) at seven days after recanalization. Nine patients (52.9%) showed a favorable outcome (mRS ?2) at the last follow-up. A favorable outcome (mRS ?2) was obtained in four of the six patients with isolated cervical ICA occlusion (4/6, 66.7%) and five of 11 patients with intracranial tandem occlusion (5/11, 45.5%). Conclusion Emergent CAS for acute stroke due to athero-thrombotic occusion of the cervical ICA showed a good technical feasibility and favorable clinical outcome. PMID:25237426

Choi, Jae Young; Lee, Jae Il; Lee, Tae Hong; Sung, Sang Min; Cho, Han Jin

2014-01-01

103

Hand vein recognition based on orientation of LBP  

NASA Astrophysics Data System (ADS)

Vein recognition is becoming an effective method for personal recognition. Vein patterns lie under the skin surface of human body, and hence provide higher reliability than other biometric traits and hard to be damaged or faked. This paper proposes a novel vein feature representation method call orientation of local binary pattern (OLBP) which is an extension of local binary pattern (LBP). OLBP can represent the orientation information of the vein pixel which is an important characteristic of vein patterns. Moreover, the OLBP can also indicate on which side of the vein centerline the pixel locates. The OLBP feature maps are encoded by 4-bit binary values and an orientation distance is developed for efficient feature matching. Based on OLBP feature representation, we construct a hand vein recognition system employing multiple hand vein patterns include palm vein, dorsal vein, and three finger veins (index, middle, and ring finger). The experimental results on a large database demonstrate the effectiveness of the proposed approach.

Bu, Wei; Wu, Xiangqian; Gao, Enying

2012-06-01

104

Successful Recanalization of Acute Superior Mesenteric Artery Thromboembolic Occlusion by a Combination of Intraarterial Thrombolysis and Mechanical Thrombectomy with a Carotid Filter  

SciTech Connect

Acute superior mesenteric artery (SMA) occlusion is a life-threatening disease, and acute intestinal ischemia develops from the sudden decrease in perfusion to the intestines. The key to saving the patient's life is early diagnosis, and prompt revascularization of the SMA can prevent intestinal infarction and decrease the risk of bowel segment necrosis. Computed tomographic angiography may be useful for rapid diagnosis. We report recanalization of an SMA occlusion in an 80-year-old man with a combination of intraarterial thrombolysis and mechanical thrombectomy with a carotid filter.

Zelenak, Kamil, E-mail: zelenak@unm.sk [University Hospital, Department of Radiology (Slovakia); Sinak, Igor; Janik, Jan; Mikolajcik, Anton; Mistuna, Dusan [University Hospital, Department of Surgery (Slovakia)

2013-06-15

105

Successful recanalization of acute superior mesenteric artery thromboembolic occlusion by a combination of intraarterial thrombolysis and mechanical thrombectomy with a carotid filter.  

PubMed

Acute superior mesenteric artery (SMA) occlusion is a life-threatening disease, and acute intestinal ischemia develops from the sudden decrease in perfusion to the intestines. The key to saving the patient's life is early diagnosis, and prompt revascularization of the SMA can prevent intestinal infarction and decrease the risk of bowel segment necrosis. Computed tomographic angiography may be useful for rapid diagnosis. We report recanalization of an SMA occlusion in an 80-year-old man with a combination of intraarterial thrombolysis and mechanical thrombectomy with a carotid filter. PMID:23007225

Zele?ák, Kamil; Sinák, Igor; Janík, Ján; Mikolaj?ík, Anton; Mištuna, Dušan

2013-06-01

106

Brain vein disorders in newborn infants.  

PubMed

The brain veins of infants are in a complex phase of remodelling in the perinatal period. Magnetic resonance venography and susceptibility-weighted imaging, together with high-resolution Doppler ultrasound, have provided new tools to aid study of venous developmental anatomy and disease. This review aims to provide a comprehensive background of vein development and perinatal venous lesions in preterm and term-born infants, and to encourage further research in both the fetus and the newborn infant, with the aim of preventing or mitigating parenchymal injury related to diseases involving veins. PMID:25212961

Raets, Marlou; Dudink, Jeroen; Raybaud, Charles; Ramenghi, Luca; Lequin, Maarten; Govaert, Paul

2015-03-01

107

Abernethy malformation with portal vein aneurysm.  

PubMed

We present the case of a 24-year-old man who was incidentally diagnosed with congenital extrahepatic portosystemic shunt with portal vein aneurysm during an investigation for non-specific abdominal pain. These are rare anomalies, and to the best of our knowledge, this is the first case reported with both anomalies associated together. Ultrasound, including color Doppler, computed tomography, and magnetic resonance imaging were performed which revealed a side-to-side shunt between the extrahepatic portal vein and the inferior vena cava, with aneurysmal fusiform dilatation of the proximal intrahepatic portal vein which ended abruptly. Etiology, clinical significance, and management strategies with regard to these abnormalities are discussed. PMID:18814137

Kumar, Atin; Kumar, Jyoti; Aggarwal, Rakesh; Srivastava, Siddharth

2008-09-01

108

Impact of Laser Fiber Design on Outcome of Endovenous Ablation of Lower-Extremity Varicose Veins: Results from a Single Practice  

SciTech Connect

The design of laser fibers used for endovenous laser ablation (EVLA) in the management of lower-extremity varicose vein disease may affect treatment success. The purpose of this investigation is to report our experience using the gold-tip NeverTouch VenaCure laser fiber (AngioDynamics, Queensbury, NY) and to compare that to our experience with standard bare-tip fibers. A retrospective chart review of 363 consecutive EVLA treatments using the gold-tip laser fiber was performed. Demographic data including patient age, sex, history of previous varicose vein stripping, vein identity, laterality, treatment length, total applied energy in joules (J), use of adjuvant sclerotherapy and ambulatory phlebectomy, treatment-related complications, and treatment failure, which was defined as recanalization of any portion of the treated vein during follow-up as assessed by duplex ultrasound examination-were entered into a spreadsheet. These data were compared with a control group of 471 EVLA treatments performed with a standard bare-tip laser fiber. Data were analyzed using independent-samples Student's t test, chi-square test, and multivariate analysis. Demographic data were similar between the two groups. Treatments with the gold-tip fiber had a failure rate of 11.1%, whereas treatment with a bare-tip fiber had a failure rate of 2.3% during a similar follow-up period. This difference was highly statistically significant (p < 0.0001). Multivariate analysis showed fiber type as the most significant factor associated with treatment failure. We conclude that laser fiber design has a significant effect on treatment success in the performance of EVLA.

Prince, Ethan A., E-mail: eprince@lifespan.org; Soares, Gregory M.; Silva, MaryLou; Taner, Anil; Ahn, SunHo; Dubel, Gregory J.; Jay, Bryan S. [Brown University/Rhode Island Hospital, Warren Alpert School of Medicine (United States)

2011-06-15

109

Detailed anatomy of the internal spermatic vein and the ovarian vein. Human cadaver study and operative spermatic venography: clinical aspects.  

PubMed

The exact anatomical course of the spermatic vein and the ovarian vein (gonadal) has not been described in detail previously. To determine the precise anatomy of the gonadal veins an autopsy study of 70 fresh human cadavers (40 men, 10 women, 10 male stillborns and 10 female stillborns) was performed by making a resin cast of both gonadal veins which then was carefully dissected. The study showed absence of valves in the spermatic vein, cross-communications between the right and left spermatic veins, and communication between the spermatic and renal capsular veins, spermatic and ipsilateral ureteral veins, and spermatic ipsilateral colonic veins. For clarification of the presence of valves intraoperative antegrade spermatic venography was done in 6 men with and 5 without varicocele. In both groups valves were not detected. These observations regarding the anatomy of the spermatic vein and the ovarian vein may help to explain related clinical conditions. PMID:2005700

Wishahi, M M

1991-04-01

110

Who Is at Risk for Varicose Veins?  

MedlinePLUS

... Division of Intramural Research Research Resources Scientific Reports Technology Transfer Clinical Trials What Are Clinical Trials? Children & ... factors may raise your risk for varicose veins, including family history, older age, gender, pregnancy, overweight or ...

111

How Is Deep Vein Thrombosis Treated?  

MedlinePLUS

... vein (called intravenous, or IV, injection). Warfarin and heparin are two blood thinners used to treat DVT. ... Coumadin® is a common brand name for warfarin.) Heparin is given as an injection or through an ...

112

How Can Varicose Veins Be Prevented?  

MedlinePLUS

... Toned muscles help blood move through the veins. Wear compression stockings if your doctor recommends them. These ... trials are research studies that explore whether a medical strategy, treatment, or ...

113

Primary leiomyosarcoma of the innominate vein.  

PubMed

Primary venous leiomyosarcoma is rare. We report the case of a primary leiomyosarcoma of the left innominate vein, with neoplastic thrombus extending into the left jugular and subclavian veins. The tumor was curatively resected en bloc with anterior mediastinal and laterocervical lymphatics, through a median sternotomy prolonged into left cervicotomy. Primary venous sarcomas may be associated with prolonged survival in individual cases, with curative resection recommended as the standard treatment, in the absence of distant spread. PMID:17349340

Illuminati, Giulio; Miraldi, Fabio; Mazzesi, Giuseppe; D'urso, Antonio; Ceccanei, Gianluca; Bezzi, Marcello

2007-01-01

114

Scattering Removal for Finger-Vein Image Restoration  

PubMed Central

Finger-vein recognition has received increased attention recently. However, the finger-vein images are always captured in poor quality. This certainly makes finger-vein feature representation unreliable, and further impairs the accuracy of finger-vein recognition. In this paper, we first give an analysis of the intrinsic factors causing finger-vein image degradation, and then propose a simple but effective image restoration method based on scattering removal. To give a proper description of finger-vein image degradation, a biological optical model (BOM) specific to finger-vein imaging is proposed according to the principle of light propagation in biological tissues. Based on BOM, the light scattering component is sensibly estimated and properly removed for finger-vein image restoration. Finally, experimental results demonstrate that the proposed method is powerful in enhancing the finger-vein image contrast and in improving the finger-vein image matching accuracy. PMID:22737028

Yang, Jinfeng; Zhang, Ben; Shi, Yihua

2012-01-01

115

Central retinal vein occlusion: a prospective histopathologic study of 29 eyes in 28 cases.  

PubMed Central

The clinical and histopathologic features of 29 eyes from 29 patients with central retinal vein occlusion (CRVO) are reported. A fresh or a recanalized thrombus was observed in each eye. This study considers the temporal aspects of the cases, and it notes the different morphologic features of the occlusion. These observations explain most of the variability of the changes observed in previous reports. We believe that these different features represent the various stages in the natural evolution of such a thrombus. The interval between CRVO and histopathologic study in our series ranged from six hours to more than 10 years. Local and systemic factors were reviewed and were found to be important in the pathogenesis of thrombus formation. Local diseases with a predisposing effect on CRVO included: glaucoma, papilledema, subdural hemorrhage, optic nerve hemorrhage, and drusen of the optic nerve head. Associated systemic diseases included: hypertension, cardiovascular and cerebrovascular disease, diabetes mellitus, and leukemia with thrombocytopenia. A fresh thrombus in the CRVO was observed in three (10.3%), and a recanalized thrombus in 26 eyes (89.7%). Endothelial-cell proliferation was a conspicuous feature in 14 (48.3%) of the eyes. Chronic inflammation in the area of the thrombus, and/or vein wall or perivenular area was observed in 14 (48.3%) of the eyes. Arterial occlusive disease was observed in seven eyes (24.6%). Cystoid macular edema was found in 26 (89.7%) of the eyes. Images FIGURE 15 A FIGURE 15 B FIGURE 15 C FIGURE 15 D FIGURE 15 E FIGURE 15 F FIGURE 15 G FIGURE 1 A FIGURE 1 B FIGURE 1 C FIGURE 2 A FIGURE 2 B FIGURE 2 C FIGURE 2 D FIGURE 2 E FIGURE 3 A FIGURE 3 B FIGURE 3 C FIGURE 3 D FIGURE 3 E FIGURE 3 F FIGURE 4 A FIGURE 4 B FIGURE 4 C FIGURE 5 A FIGURE 5 B FIGURE 5 C FIGURE 6 A FIGURE 6 B FIGURE 7 A FIGURE 7 B FIGURE 7 C FIGURE 7 D FIGURE 8 A FIGURE 8 B FIGURE 9 A FIGURE 9 B FIGURE 9 C FIGURE 9 D FIGURE 10 A FIGURE 10 B FIGURE 11 A FIGURE 11 B FIGURE 11 C FIGURE 12 A FIGURE 12 B FIGURE 12 C FIGURE 12 D FIGURE 13 A FIGURE 13 B FIGURE 13 C FIGURE 13 D FIGURE 14 A FIGURE 14 B FIGURE 16 A FIGURE 16 B FIGURE 17 A FIGURE 17 B FIGURE 17 C FIGURE 17 D FIGURE 17 E FIGURE 17 F FIGURE 18 A FIGURE 18 B FIGURE 18 C FIGURE 19 A FIGURE 19 B FIGURE 19 C FIGURE 19 D FIGURE 19 E FIGURE 20 A FIGURE 20 B FIGURE 20 C FIGURE 20 D FIGURE 21 A FIGURE 21 B FIGURE 22 A FIGURE 22 B FIGURE 23 A FIGURE 23 B FIGURE 23 C FIGURE 23 D FIGURE 23 E FIGURE 23 F FIGURE 23 G FIGURE 23 H FIGURE 24 A FIGURE 24 B FIGURE 25 A FIGURE 25 B FIGURE 26 A FIGURE 26 B FIGURE 26 C FIGURE 26 D FIGURE 27 A FIGURE 27 B FIGURE 27 C FIGURE 28 FIGURE 29 PMID:7342407

Green, W R; Chan, C C; Hutchins, G M; Terry, J M

1981-01-01

116

Gonadal vein tumor thrombosis due to renal cell carcinoma  

PubMed Central

Renal cell carcinoma (RCC) had a tendency to extend into the renal vein and inferior vena cava, while extension into the gonadal vein has been rarely reported. Gonadal vein tumor thrombosis appears as an enhancing filling defect within the dilated gonadal vein anterior to the psoas muscle and shows an enhancement pattern identical to that of the original tumor. The possibility of gonadal vein thrombosis should be kept in mind when looking at an imaging study of patients with RCC

Haghighatkhah, Hamidreza; Karimi, Mohammad Ali; Taheri, Morteza Sanei

2015-01-01

117

Deep vein thrombosis: a clinical review  

PubMed Central

Background: Deep vein thrombosis (DVT) is the formation of blood clots (thrombi) in the deep veins. It commonly affects the deep leg veins (such as the calf veins, femoral vein, or popliteal vein) or the deep veins of the pelvis. It is a potentially dangerous condition that can lead to preventable morbidity and mortality. Aim: To present an update on the causes and management of DVT. Methods: A review of publications obtained from Medline search, medical libraries, and Google. Results: DVT affects 0.1% of persons per year. It is predominantly a disease of the elderly and has a slight male preponderance. The approach to making a diagnosis currently involves an algorithm combining pretest probability, D-dimer testing, and compression ultrasonography. This will guide further investigations if necessary. Prophylaxis is both mechanical and pharmacological. The goals of treatment are to prevent extension of thrombi, pulmonary embolism, recurrence of thrombi, and the development of complications such as pulmonary hypertension and post-thrombotic syndrome. Conclusion: DVT is a potentially dangerous condition with a myriad of risk factors. Prophylaxis is very important and can be mechanical and pharmacological. The mainstay of treatment is anticoagulant therapy. Low-molecular-weight heparin, unfractionated heparin, and vitamin K antagonists have been the treatment of choice. Currently anticoagulants specifically targeting components of the common pathway have been recommended for prophylaxis. These include fondaparinux, a selective indirect factor Xa inhibitor and the new oral selective direct thrombin inhibitors (dabigatran) and selective factor Xa inhibitors (rivaroxaban and apixaban). Others are currently undergoing trials. Thrombolytics and vena caval filters are very rarely indicated in special circumstances. PMID:22287864

Kesieme, Emeka; Kesieme, Chinenye; Jebbin, Nze; Irekpita, Eshiobo; Dongo, Andrew

2011-01-01

118

Penile vein ligation for venogenic impotence.  

PubMed

We have performed penile vein ligation on 35 patients with venogenic impotence from July 1989 to December 1991. The criteria for surgery were (1) age less than 60 years; (2) negative vasoactive agent intracavernous injection but normal penile arterial function, and (3) abnormal venous leakage documented by dynamic infusion cavernosometry and cavernosography. The procedure in venous ligation is excision of the deep dorsal vein from coronary sulcus to pubic arch, and ligation of cavernous veins after identification. The average follow-up was 27.5 months (range 12-37 months) for 30 patients. The 2 patients who revealed no erection at all immediately after operation had dense adhesion of penile hilar region caused in one case by severe pelvic trauma and in the other by pubic bone fracture. Twenty-eight (93.3%) patients were found to sustain excellent erection within 3 months postoperatively. However, only 12 (40.0%) patients sustained spontaneous erection at long-term follow-up, while another 7 (23.3%) responded to intracavernous injection. It is worth mentioning that tortuous and marked dilation of the deep dorsal vein and/or cavernous veins were found intraoperatively in 6 patients who were observed to have excellent erections postoperatively. Inadequate elimination of the leakage veins, especially crural veins, is the most likely factor in those who had a recurrence of erectile dysfunction. However, the corpus cavernosum, particularly a myopathic condition or inadequate neurotransmitters, also plays an important role. Complications included shortness of penis (3 patients), penile deviation (3), numbness of glans penis (4) and wound infection (1).(ABSTRACT TRUNCATED AT 250 WORDS) PMID:7925529

Hwang, T I; Yang, C R

1994-01-01

119

Varicose Veins, Deep Vein Thrombosis, and Haemorrhoids: Epidemiology and Suggested Aetiology  

Microsoft Academic Search

Current concepts on the aetiology of varicose veins, deep vein thrombosis, and haemorrhoids have been examined and, in the light of epidemiological evidence, found wanting.It is suggested that the fundamental cause of these disorders is faecal arrest which is the result of a low-residue diet.

Denis P. Burkitt

1972-01-01

120

Endovascular Radiofrequency Ablation for Varicose Veins  

PubMed Central

Executive Summary Objective The objective of the MAS evidence review was to conduct a systematic review of the available evidence on the safety, effectiveness, durability and cost–effectiveness of endovascular radiofrequency ablation (RFA) for the treatment of primary symptomatic varicose veins. Background The Ontario Health Technology Advisory Committee (OHTAC) met on August 26th, 2010 to review the safety, effectiveness, durability, and cost-effectiveness of RFA for the treatment of primary symptomatic varicose veins based on an evidence-based review by the Medical Advisory Secretariat (MAS). Clinical Condition Varicose veins (VV) are tortuous, twisted, or elongated veins. This can be due to existing (inherited) valve dysfunction or decreased vein elasticity (primary venous reflux) or valve damage from prior thrombotic events (secondary venous reflux). The end result is pooling of blood in the veins, increased venous pressure and subsequent vein enlargement. As a result of high venous pressure, branch vessels balloon out leading to varicosities (varicose veins). Symptoms typically affect the lower extremities and include (but are not limited to): aching, swelling, throbbing, night cramps, restless legs, leg fatigue, itching and burning. Left untreated, venous reflux tends to be progressive, often leading to chronic venous insufficiency (CVI). A number of complications are associated with untreated venous reflux: including superficial thrombophlebitis as well as variceal rupture and haemorrhage. CVI often results in chronic skin changes referred to as stasis dermatitis. Stasis dermatitis is comprised of a spectrum of cutaneous abnormalities including edema, hyperpigmentation, eczema, lipodermatosclerosis and stasis ulceration. Ulceration represents the disease end point for severe CVI. CVI is associated with a reduced quality of life particularly in relation to pain, physical function and mobility. In severe cases, VV with ulcers, QOL has been rated to be as bad or worse as other chronic diseases such as back pain and arthritis. Lower limb VV is a very common disease affecting adults – estimated to be the 7th most common reason for physician referral in the US. There is a very strong familial predisposition to VV. The risk in offspring is 90% if both parents affected, 20% when neither affected and 45% (25% boys, 62% girls) if one parent affected. The prevalence of VV worldwide ranges from 5% to 15% among men and 3% to 29% among women varying by the age, gender and ethnicity of the study population, survey methods and disease definition and measurement. The annual incidence of VV estimated from the Framingham Study was reported to be 2.6% among women and 1.9% among men and did not vary within the age range (40-89 years) studied. Approximately 1% of the adult population has a stasis ulcer of venous origin at any one time with 4% at risk. The majority of leg ulcer patients are elderly with simple superficial vein reflux. Stasis ulcers are often lengthy medical problems and can last for several years and, despite effective compression therapy and multilayer bandaging are associated with high recurrence rates. Recent trials involving surgical treatment of superficial vein reflux have resulted in healing and significantly reduced recurrence rates. Endovascular Radiofrequency Ablation for Varicose Veins RFA is an image-guided minimally invasive treatment alternative to surgical stripping of superficial venous reflux. RFA does not require an operating room or general anaesthesia and has been performed in an outpatient setting by a variety of medical specialties including surgeons and interventional radiologists. Rather than surgically removing the vein, RFA works by destroying or ablating the refluxing vein segment using thermal energy delivered through a radiofrequency catheter. Prior to performing RFA, color-flow Doppler ultrasonography is used to confirm and map all areas of venous reflux to devise a safe and effective treatment plan. The RFA procedure involves the introduction of a guide wire into the target v

2011-01-01

121

Ligation of superior mesenteric vein and portal to splenic vein anastomosis after superior mesenteric-portal vein confluence resection during pancreaticoduodenectomy – Case report  

PubMed Central

62 year old Caucasian female with pancreatic head mass abutting the superior mesenteric vein (SMV) presented with fine needle aspiration biopsy confirmed diagnosis of ductal adenocarcinoma. CT scan showed near complete obstruction of portal vein and large SMV collateral development. After 3 months of neoadjuvant therapy, her portal vein flow improved significantly, SMV collateral circulation was diminished. Pancreaticoduodenectomy (PD) and superior mesenteric portal vein (SMPV) confluence resection were performed; A saphenous vein interposition graft thrombosed immediately. The splenic vein remnant was distended and adjacent to the stump of the portal vein. Harvesting an internal jugular vein graft required extra time and using a synthetic graft posed a risk of graft thrombosis or infection. As a result, we chose to perform a direct anastomosis of the portal and splenic vein in a desperate situation. The anastomosis decompressed the mesenteric venous system, so we then ligated the SMV. The patient had an uneventful postoperative course, except transient ascites. She redeveloped ascites more than one year later. At that time a PET scan showed bilateral lung and right femur metastatic disease. She expired 15 months after PD. Conclusion The lessons we learned are (1) Before SMPV confluence resection, internal jugular vein graft should be ready for reconstruction. (2) Synthetic graft is an alternative for internal jugular vein graft. (3) Direct portal vein to SMV anastomosis can be achieved by mobilizing liver. (4) It is possible that venous collaterals secondary to SMV tumor obstruction may have allowed this patient's post-operative survival.

Tang, Jianlin; Abbas, Jihad; Hoetzl, Katherine; Allison, David; Osman, Mahamed; Williams, Mallory; Zelenock, Gerald B.

2014-01-01

122

Biomolecular mechanisms in varicose veins development.  

PubMed

Varicose veins can be described as tortuous and dilated palpable veins, which are more than 3 mm in diameter. They are one of the clinical presentations of chronic venous disorders, which are a significant cause of morbidity. The prevalence of varicose veins has been estimated at 25% to 33% in women and 10% to 20% in men and is still increasing at an alarming rate. Family history, older age, female, pregnancy, obesity, standing occupations and a history of previous deep venous thrombosis are the predominant risk factors. A great amount of factors are implicated in the pathogenesis of varicose veins, including changes in hydrostatic pressure, valvular incompetence, deep venous obstruction, ineffective function of calf muscle pump, biochemical and structural alterations of the vessel wall, extracellular matrix abnormalities, impaired balance between growth factors or cytokines, genetic alterations and several other mechanisms. Nevertheless, the issue of pathogenesis in varicose veins is still not completely known, even if a great progress has been made in understanding their molecular basis. This kind of studies appears promising and should be encouraged, and perhaps the new insight in this matter may result in targeted therapy or possibly prevention. PMID:25449990

Segiet, Oliwia Anna; Brzozowa, Marlena; Piecuch, Adam; Dudek, Damian; Reichman-Warmusz, Edyta; Wojnicz, Romuald

2014-10-30

123

Retinal vein occlusion in high altitude.  

PubMed

Staying at high altitude has been reported to be associated with thrombosis in lowlanders. We report 3 cases of retinal vein occlusion in high altitude. Two were males 31 and 37 years of age, who developed nonischemic central retinal vein occlusion while staying at high altitude. The former developed central retinal vein occlusion after 90 days at 6309 m, while the latter was affected at an altitude of 3353 m where he had been for the past 1 year and had recurrence of central retinal vein occlusion in the other eye on re-entry to the same altitude. The third case is that of a 40-year-old female who developed inferotemporal branch retinal vein occlusion on the second day after entry into high altitude (3353 m) by air, while ascending further in a vehicle at an altitude of approximately 4572 m. All three did not have any systemic disease and showed complete recovery on descent to a lower altitude. PMID:22206565

Gupta, Atul; Singh, Surinderpal; Ahluwalia, Tejinder Singh; Khanna, Anurag

2011-01-01

124

Oversized vein grafts develop advanced atherosclerosis in hypercholesterolemic minipigs  

PubMed Central

Background Accelerated atherosclerosis is the main cause of late aortocoronary vein graft failure. We aimed to develop a large animal model for the study of pathogenesis and treatment of vein graft atherosclerosis. Methods An autologous reversed jugular vein graft was inserted end-to-end into the transected common carotid artery of ten hypercholesteroemic minipigs. The vein grafts were investigated 12-14 weeks later with ultrasound and angiograpy in vivo and microscopy post mortem. Results One minipig died during follow up (patent vein graft at autopsy), and one vein graft thrombosed early. In the remaining eight patent vein grafts, the mean (standard deviation) intima-media thickness was 712 ?m (276 ?m) versus 204 ?m (74 ?m) in the contralateral control internal jugular veins (P < .01). Advanced atherosclerotic plaques were found in three of four oversized vein grafts (diameter of graft > diameter of artery). No plaques were found in four non-oversized vein grafts (P < .05). Conclusions Our model of jugular vein graft in the common carotid artery of hypercholesterolemic minipigs displayed the components of human vein graft disease, i.e. thrombosis, intimal hyperplasia, and atherosclerosis. Advanced atherosclerosis, the main cause of late failure of human aortocoronary vein grafts was only seen in oversized grafts. This finding suggests that oversized vein grafts may have detrimental effects on patient outcome. PMID:22463679

2012-01-01

125

Lower Energy Endovenous Laser Ablation of the Great Saphenous Vein with 980 nm Diode Laser in Continuous Mode  

SciTech Connect

Purpose. To assess clinical outcomes, complication rates, and unit energy applied using 980 nm diode endovenous laser treatment at 11 watts for symptomatic great saphenous vein (GSV) incompetence and reflux disease. Methods. Thirty-four consecutive ablation therapies with a 980 nm diode endovenous laser at 11 watts were studied. The diagnosis of GSV incompetence with reflux was made by clinical evaluation and duplex Doppler examinations. The treated GSVs had a mean diameter of 1.19 cm (range 0.5-2.2 cm). The patients were followed with clinical evaluation and color flow duplex studies up to 18.5 months (mean 12.19 months {+-} 4.18). Results. Using 980 nm diode endovenous laser ablation in continuous mode, 100% technical success was noted. The mean length of GSVs treated was 33.82 cm (range 15-45 cm). The mean energy applied during the treatment was 1,155.81 joules (J) {+-} 239.50 (range 545.40-1620 J) for a mean treatment duration of 90.77 sec {+-} 21.77. The average laser fiber withdrawal speed was 0.35 cm/sec {+-} 0.054. The mean energy applied per length of GSV was 35.16 J/cm {+-} 8.43. Energy fluence, calculated separately for each patient, averaged 9.82 J/cm{sup 2} {+-} 4.97. At up to 18.5 months follow-up (mean 12.19 months), 0% recanalization was noted; 92% clinical improvement was achieved. There was no major complication. Minor complications included 1 patient with hematoma at the percutaneous venotomy site, 1 patient with thrombophlebitis on superficial tributary varices of the treated GSV, 24% ecchymoses, and 32% self-limiting hypersensitivity/tenderness/'pulling' sensation along the treatment area. One patient developed temporary paresthesia. Four endovenous laser ablation treatments (12%) were followed by adjunctive sclerotherapies for improved cosmetic results. Conclusion. Endovenous laser ablation treatment of GSV using a 980 nm diode laser at 11 watts in continuous mode appears safe and effective. Mean energy applied per treated GSV length of 35.16 J/cm or mean laser fluence of 9.82 J/cm{sup 2} appears adequate, resulting in 0% recanalization and low minor complication rates.

Kim, Hyun S., E-mail: sikhkim@jhmi.edu; Nwankwo, Ikechi J.; Hong, Kelvin [Johns Hopkins University School of Medicine, Russell H. Morgan Department of Radiology and Radiological Science (United States); McElgunn, Patrick S.J. [Johns Hopkins University School of Medicine, Department of Dermatology (United States)

2006-02-15

126

Successful recanalization of a left circumflex artery jailed with a polytetrafluoroethylene-covered stent after coronary perforation during stent implantation in the left main bifurcation.  

PubMed

An 88-year-old woman underwent emergency percutaneous coronary intervention (PCI) to treat circulatory collapse with severe stenosis in the distal left main coronary artery (LMCA). After 3.5/18-mm stent deployment from the LMCA to the left anterior descending artery (LAD), coronary perforation occurred in the LAD ostium. Therefore, we implanted a polytetrafluoroethylene (PTFE)-covered stent crossing over the left circumflex artery (LCX), and achieved successful hemostasis. Additional PCI was undertaken to recanalize the LCX. A Confienza 8-20 guidewire was able to penetrate the wall of the PTFE-covered stent, and coronary flow was successfully recovered after deployment of a 2.5/8-mm stent in the proximal LCX. PMID:24557981

Taniguchi, Norimasa; Takahashi, Akihiko; Mizuguchi, Yukio; Yamada, Takeshi; Hata, Tetsuya; Nakajima, Shunsuke

2015-01-01

127

Endovascular Laser Therapy for Varicose Veins  

PubMed Central

Executive Summary Objective The objective of the MAS evidence review was to conduct a systematic review of the available evidence on the safety, effectiveness, durability and cost–effectiveness of endovascular laser therapy (ELT) for the treatment of primary symptomatic varicose veins (VV). Background The Ontario Health Technology Advisory Committee (OHTAC) met on November 27, 2009 to review the safety, effectiveness, durability and cost-effectiveness of ELT for the treatment of primary VV based on an evidence-based review by the Medical Advisory Secretariat (MAS). Clinical Condition VV are tortuous, twisted, or elongated veins. This can be due to existing (inherited) valve dysfunction or decreased vein elasticity (primary venous reflux) or valve damage from prior thrombotic events (secondary venous reflux). The end result is pooling of blood in the veins, increased venous pressure and subsequent vein enlargement. As a result of high venous pressure, branch vessels balloon out leading to varicosities (varicose veins). Symptoms typically affect the lower extremities and include (but are not limited to): aching, swelling, throbbing, night cramps, restless legs, leg fatigue, itching and burning. Left untreated, venous reflux tends to be progressive, often leading to chronic venous insufficiency (CVI). A number of complications are associated with untreated venous reflux: including superficial thrombophlebitis as well as variceal rupture and haemorrhage. CVI often results in chronic skin changes referred to as stasis dermatitis. Stasis dermatitis is comprised of a spectrum of cutaneous abnormalities including edema, hyperpigmentation, eczema, lipodermatosclerosis and stasis ulceration. Ulceration represents the disease end point for severe CVI. CVI is associated with a reduced quality of life particularly in relation to pain, physical function and mobility. In severe cases, VV with ulcers, QOL has been rated to be as bad or worse as other chronic diseases such as back pain and arthritis. Lower limb VV is a common disease affecting adults and estimated to be the seventh most common reason for physician referral in the US. There is a strong familial predisposition to VV with the risk in offspring being 90% if both parents affected, 20% when neither is affected, and 45% (25% boys, 62% girls) if one parent is affected. Globally, the prevalence of VV ranges from 5% to 15% among men and 3% to 29% among women varying by the age, gender and ethnicity of the study population, survey methods and disease definition and measurement. The annual incidence of VV estimated from the Framingham Study was reported to be 2.6% among women and 1.9% among men and did not vary within the age range (40-89 years) studied. Approximately 1% of the adult population has a stasis ulcer of venous origin at any one time with 4% at risk. The majority of leg ulcer patients are elderly with simple superficial vein reflux. Stasis ulcers are often lengthy medical problems and can last for several years and, despite effective compression therapy and multilayer bandaging are associated with high recurrence rates. Recent trials involving surgical treatment of superficial vein reflux have resulted in healing and significantly reduced recurrence rates. Endovascular Laser Therapy for VV ELT is an image-guided, minimally invasive treatment alternative to surgical stripping of superficial venous reflux. It does not require an operating room or general anesthesia and has been performed in outpatient settings by a variety of medical specialties including surgeons (vascular or general), interventional radiologists and phlebologists. Rather than surgically removing the vein, ELT works by destroying, cauterizing or ablating the refluxing vein segment using heat energy delivered via laser fibre. Prior to ELT, colour-flow Doppler ultrasonography is used to confirm and map all areas of venous reflux to devise a safe and effective treatment plan. The ELT procedure involves the introduction of a guide wire into the target vein under ultrasound guidance followed by the inse

2010-01-01

128

Deep Vein Thrombosis - Multiple Languages: MedlinePlus  

MedlinePLUS

... features on this page, please enable JavaScript. Deep Vein Thrombosis - Multiple Languages Arabic (???????) Bosnian (Bosanski) French ( ... Somali (af Soomaali) Spanish (español) Arabic (???????) Deep Vein Thrombosis (DVT) (Arabic) ??????? Bilingual PDF Health Information ...

129

Varicose and other vein problems - self-care  

MedlinePLUS

... you stand. As a result, you may have: Varicose veins Swelling in your legs Skin changes or even ... at home to: Slow down the development of varicose veins Decrease any discomfort Prevent skin ulcers

130

Are You At Risk for Deep Vein Thrombosis?  

MedlinePLUS

... Are You at Risk for Deep Vein Thrombosis? Language: English Español (Spanish) Share Compartir Deep vein thrombosis occurs ... Address What's this? Submit What's this? Submit Button Language: English Español (Spanish) File Formats Help: How do I ...

131

Tectonic fibrous veins: initiation and evolution. Ouachita Orogen, Arkansas  

E-print Network

Veins are ubiquitous features in deformed rocks. Despite observations on syntectonic veins spanning two centuries, fundamental questions remain unanswered. Their origin as fractures is largely established but it is still not known why...

Cervantes, Pablo

2009-05-15

132

Retinal vessel classification: sorting arteries and veins.  

PubMed

For the discovery of biomarkers in the retinal vasculature it is essential to classify vessels into arteries and veins. We automatically classify retinal vessels as arteries or veins based on colour features using a Gaussian Mixture Model, an Expectation-Maximization (GMM-EM) unsupervised classifier, and a quadrant-pairwise approach. Classification is performed on illumination-corrected images. 406 vessels from 35 images were processed resulting in 92% correct classification (when unlabelled vessels are not taken into account) as compared to 87.6%, 90.08%, and 88.28% reported in [12] [14] and [15]. The classifier results were compared against two trained human graders to establish performance parameters to validate the success of classification method. The proposed system results in specificity of (0.8978, 0.9591) and precision (positive predicted value) of (0.9045, 0.9408) as compared to specificity of (0.8920, 0.7918) and precision of (0.8802, 0.8118) for (arteries, veins) respectively as reported in [13]. The classification accuracy was found to be 0.8719 and 0.8547 for veins and arteries, respectively. PMID:24111454

Relan, D; MacGillivray, T; Ballerini, L; Trucco, E

2013-01-01

133

Host range comparison of the causal agents of pepper yellow vein and lettuce big vein  

Microsoft Academic Search

A number of solanaceous and composite plant species were tested as hosts for the causal agents of pepper yellow vein (PYVA) and lettuce big vein (LBVA), transmitted by a pepper and a lettuce isolate ofOlpidium brassicae, respectively. The agents had the following artificial hosts in common:Lycopersicon esculentum, Solanum melongena, Physalis floridana, Nicandra physaloides, Lactuca sativa, Sonchus oleraceus andL. virosa. Capsicum

A. Th. B. Rast

1992-01-01

134

Neovascularization and recurrent varicose veins: more histologic and ultrasound evidence  

Microsoft Academic Search

BackgroundThe recurrence of varicose veins is a common and costly consequence of varicose vein surgery. Despite the long history and vast experience of varicose vein surgery, the exact cause of recurrence is still unknown. This study aims to investigate the cause of recurrence further by correlating findings from duplex ultrasound scans, resin casts, and histologic investigation at the recurrence of

André M van Rij; Gregory T Jones; Gerry B Hill; Ping Jiang

2004-01-01

135

Prevalence and Risk Factors of Varicose Veins in Japanese Women  

Microsoft Academic Search

The prevalence and risk factors of varicose veins in Japan were investigated in 541 Japanese women. Varicose veins were defined as any dilated, tortuous, and elongated veins of the lower extremity and classified into four types. The total prevalence rate was 45%. Saphenous type was observed in 22%, segment type in 35%, reticular type in 28%, and web type in

Masafumi Hirai; Kenichi Naiki; Ryu Nakayama

1990-01-01

136

Development of HIFU Therapy System for Lower Extremity Varicose Veins  

Microsoft Academic Search

High-intensity focused ultrasound (HIFU) treatment utilizing microbubbles was investigated in the present study. It is known that microbubbles have the potential to enhance the heating effects of an ultrasound field. In this study, the heat accompanying microbubble oscillation was used to occlude varicose veins. Alteration of veins was observed after ultrasound irradiation. Veins were resected by stripping. In this study,

Ryuhei Ota; Jun Suzuki; Kiyoshi Yoshinaka; Juno Deguchi; Shu Takagi; Tetsuro Miyata; Yoichiro Matsumoto

2009-01-01

137

Successful use of the inferior mesenteric vein for renal transplantation.  

PubMed

For renal transplantation, the standard venous drainage of the allograft is via the iliac vein. In unusual circumstances, such as thrombosis or agenesis of the iliac veins and the inferior vena cava, portal venous drainage may be a suitable option. We report a case in which the inferior mesenteric vein was used for venous drainage of a cadaveric renal allograft. PMID:12859544

Patel, Pratik; Krishnamurthi, Venkatesh

2003-08-01

138

Congenital intrahepatic portosystemic shunt with variant inferior right hepatic vein.  

PubMed

We present a case of congenital intrahepatic aneurysmal portosystemic shunt in which the right portal vein communicates with both a variant inferior right hepatic vein and the right hepatic vein. We also describe the importance and efficacy of three dimensional computed tomography reconstruction images in determining subtle, small shunt vessels. PMID:18553284

Senocak, Efsun; O?uz, Berna; Edgüer, Tahsin; Cila, Ay?enur

2008-06-01

139

Long-term assessment of cryopreserved vein bypass grafting success  

Microsoft Academic Search

Purpose: When autogenous vein is unavailable, cryopreserved veins have been used in patients as a means of attempted limb salvage. We evaluated the long-term patency and limb salvage rates for patients undergoing bypass grafting with cryopreserved veins. Methods: Medical records were reviewed for patients undergoing cryovein bypass grafting at two hospitals from 1992 to 1997. Follow-up data were obtained from

Linda Harris; Monica O'Brien-Irr; John J. Ricotta

2001-01-01

140

A case of non-cirrhotic portal hypertension associated with anti-retroviral therapy in a Japanese patient with human immunodeficiency virus infection.  

PubMed

The diagnosis of non-cirrhotic portal hypertension (NCPH), a rare but potentially life-threatening complication in human immunodeficiency virus (HIV)-positive individuals, often occurs only after the emergence of fatal manifestations such as bleeding of esophageal varices. We herein report a female Japanese HIV patient who developed NCPH approximately 4 years after discontinuation of 65 months of didanosine (ddI) administration. The patient presented with severe ascites, bloody bowel discharge, extreme abdominal swelling, and symptoms of portal hypertension but no sign of liver cirrhosis. Examination revealed esophageal varices, oozing-like bleeding from a wide part of the colon, significant atrophy of the right lobe of the liver, and arterio-portal shunting and recanalization from the left medial segment branch of the portal vein to a paraumbilical vein, but no visible obstruction of the main trunk of the portal vein. Treatment for esophageal varices consisted of coagulation therapy with argon plasma after enforcement by endoscopic sclerotherapy and oral administration of ?-blockers for elevated portal blood pressure. The patient has not experienced gastrointestinal bleeding in the approximately 5 years since the diagnosis of NCPH. Reviewing this case suggests the importance of suspecting NCPH in HIV patients with liver dysfunction of unknown etiology with a history of ddI and other purine analogs use, as well as the importance of controlling portal hypertension and esophageal varices in the treatment of NCPH. PMID:25034388

Yajima, Keishiro; Uehira, Tomoko; Otera, Hiroshi; Koizumi, Yusuke; Watanabe, Dai; Kodama, Yoshinori; Kuzushita, Noriyoshi; Nishida, Yasuharu; Mita, Eiji; Mano, Masayuki; Shirasaka, Takuma

2014-09-01

141

Internal vein texture and vein evolution of the epithermal Shila-Paula district, southern Peru  

NASA Astrophysics Data System (ADS)

The epithermal Shila-Paula Au-Ag district is characterized by numerous veins hosted in Tertiary volcanic rocks of the Western Cordillera (southern Peru). Field studies of the ore bodies reveal a systematic association of a main E-W vein with secondary N55-60°W veins—two directions that are also reflected by the orientation of fluid-inclusion planes in quartz crystals of the host rock. In areas where this pattern is not recognized, such as the Apacheta sector, vein emplacement seems to have been guided by regional N40°E and N40°W fractures. Two main vein-filling stages are identified. stage 1 is a quartz-adularia-pyrite-galena-sphalerite-chalcopyrite-electrum-Mn silicate-carbonate assemblage that fills the main E-W veins. stage 2, which contains most of the precious-metal mineralization, is divided into pre-bonanza and bonanza substages. The pre-bonanza substage consists of a quartz-adularia-carbonate assemblage that is observed within the secondary N45-60°W veins, in veinlets that cut the stage 1 assemblage, and in final open-space fillings. The two latter structures are finally filled by the bonanza substage characterized by a Fe-poor sphalerite-chalcopyrite-pyrite-galena-tennantite-tetrahedrite-polybasite-pearceite-electrum assemblage. The ore in the main veins is systematically brecciated, whereas the ore in the secondary veins and geodes is characteristic of open-space crystallization. Microthermometric measurements on sphalerite from both stages and on quartz and calcite from stage 2 indicate a salinity range of 0 to 15.5 wt% NaCl equivalent and homogenization temperatures bracketed between 200 and 330°C. Secondary CO2-, N2- and H2S-bearing fluid inclusions are also identified. The age of vein emplacement, based on 40Ar/39Ar ages obtained on adularia of different veins, is estimated at around 11 Ma, with some overlap between adularia of stage 1 (11.4±0.4 Ma) and of stage 2 (10.8±0.3 Ma). A three-phase tectonic model has been constructed to explain the vein formation. Phase 1 corresponds to the assumed development of E-W sinistral shear zones and associated N60°W cleavages under the effects of a NE-SW shortening direction that is recognized at Andean scale. These structures contain the stage 1 ore assemblage that was brecciated during ongoing deformation. Phase 2 is a reactivation of earlier structures under a NW-SE shortening direction that allowed the reopening of the preexisting schistosity and the formation of scarce N50°E-striking S2-cleavage planes filled by the stage 2 pre-bonanza minerals. Phase 3 coincides with the bonanza ore emplacement in the secondary N45-60°W veins and also in open-space in the core of the main E-W veins. Our combined tectonic, textural, mineralogical, fluid-inclusion, and geochronological study presents a complete model of vein formation in which the reactivation of previously formed tectonic structures plays a significant role in ore formation.

Chauvet, Alain; Bailly, Laurent; André, Anne-Sylvie; Monié, Patrick; Cassard, Daniel; Tajada, Fernando Llosa; Vargas, Juan Rosas; Tuduri, Johann

2006-07-01

142

MDCT Venography Evaluation of a Rare Collateral Vein Draining from the Left Subclavian Vein to the Great Cardiac Vein  

PubMed Central

Congenital vascular anomalies of the venous drainage in the chest affect both cardiac and non-cardiac structures. Collateral venous drainage from the left subclavian vein to the great cardiac vein is a rare venous drainage pattern. These anomalies present a diagnostic challenge. Multi-detector computed tomography (MDCT) is useful in the diagnosis and treatment planning of these clinically complex disorders. We present a case report of an 18-year-old Caucasian male who came to our institute for evaluation of venous drainage patterns to the heart. We describe the contrast technique of bilateral dual injection MDCT venography and the imaging features of the venous drainage patterns to the heart. PMID:25379351

Abchee, Antoine; Saade, Charbel; Al-Mohiy, Hussain; El-Merhi, Fadi

2014-01-01

143

Conditions of vein formation in the southern Appalachian foreland: constraints from vein geometries and fluid inclusions  

NASA Astrophysics Data System (ADS)

The Nolichucky Shale in the Whiteoak Mountain thrust sheet of the southern Appalachian foreland contains four coeval bed-normal calcite vein sets that trended 015°, 055°, 090° and 320° before thrusting. The pretectonic veins were displaced by syn-tectonic bed-parallel slickensided calcite veins during local Alleghanian thrusting. Fluid inclusion thermometry indicates precipitation of both bed-normal and bed-parallel veins from NaCl-CaCl 2 brines (27 wt% NaCl-equiv. salinity), at 80-110°C for bed-normal veins and 110°C for bed-parallel veins. These temperatures correspond to burial depths of 2.4-3.6 km, which were attained after the middle Mississippian. These pressure-corrected homogenization temperatures are comparable to time-temperature indicators, such as CAI and illite crystallinity, and indicate that inclusions were trapped near-maximum burial conditions and were not deformed after trapping. This conclusion is supported by the absence of petrographic evidence for inclusion failure and a worst-case mechanical analysis that indicates a lack of brittle deformation to inclusions after trapping. The four coeval bed-normal vein sets could not be formed by one simple stress field, nor by the development of a single structure, but required the interaction of at least two stress components or structures. It is proposed that the interaction of the Alleghanian and Ouachita orogenic stress components, beyond the limits of thrusting, produced the sets as coeval Alleghanian orthogonal (055°,320°) and Ouchita sub-orthogonal (015°, 090°) mode I fractures.

Foreman, J. Lincoln; Dunne, William M.

144

Clinical evaluation of vein contrast enhancement  

NASA Astrophysics Data System (ADS)

A clinical study is underway to compare an experimental infrared (IR) device, OnTarget OnTarget at LeBonheur Children's Medical Center, Methodist Healthcare, in Memphis, TN, while the adult study site is the clinical research center at Bowld Hospital, also in Memphis, TN. Early results on 35 pediatric and 25 adult subjects indicate that OnTarget years' experience in accessing veins in pediatric subjects, and that it could be very helpful to a phlebotomist with limited experience when accessing veins in both adult and pediatric subjects. The study uses monitor based OnTarget area of the patients anatomy enlarged and contrast enhanced on a LCD monitor. The phlebotomist can then compare the OnTarget or feel when examining a subject.

Lovhoiden, Gunnar; Deshmukh, Harshal; Zeman, Herbert D.

2002-05-01

145

Finger Vein Recognition with Personalized Feature Selection  

PubMed Central

Finger veins are a promising biometric pattern for personalized identification in terms of their advantages over existing biometrics. Based on the spatial pyramid representation and the combination of more effective information such as gray, texture and shape, this paper proposes a simple but powerful feature, called Pyramid Histograms of Gray, Texture and Orientation Gradients (PHGTOG). For a finger vein image, PHGTOG can reflect the global spatial layout and local details of gray, texture and shape. To further improve the recognition performance and reduce the computational complexity, we select a personalized subset of features from PHGTOG for each subject by using the sparse weight vector, which is trained by using LASSO and called PFS-PHGTOG. We conduct extensive experiments to demonstrate the promise of the PHGTOG and PFS-PHGTOG, experimental results on our databases show that PHGTOG outperforms the other existing features. Moreover, PFS-PHGTOG can further boost the performance in comparison with PHGTOG. PMID:23974154

Xi, Xiaoming; Yang, Gongping; Yin, Yilong; Meng, Xianjing

2013-01-01

146

Deep vein thrombosis in acute myelogenous leukemia.  

PubMed

Thrombotic complications in acute leukemia are often underestimated because bleeding complications generally dominate the clinical picture. While there are many thrombogenic factors shared by both solid tumors and leukemia, many additional prothrombotic features are present in leukemia. The prothrombotic factors include hyperleukocytosis, increased expression of tissue factor and its activation in leukemic cells, and the prothrombotic adverse effects of therapeutic agents and vascular access cathethers. A 18-year old woman came with swelling on her right leg 10 days before hospital admission. Since 2 months before she had had weakness, pallor and fever without bleeding manifestation. Hematologic examinations showed anemia, leukocytosis with monoblast and thrombocytopenia. Deep vein thrombosis in right femoral and right popliteal vein was confirmed using compression ultrasonography. The treatment of such complications is challenging because of the high risk of hemorrhage in this group of patients, especially due to their severe thrombocytopenia. PMID:20124617

Oehadian, Amaylia; Iqbal, Mohammad; Sumantri, Rachmat

2009-10-01

147

Percutaneous Transumbilical Portal Vein Embolization in a Patient with a Ruptured Hepatocellular Carcinoma Supplied by the Portal Vein  

SciTech Connect

We describe a case of a ruptured hepatocellular carcinoma supplied by the portal vein that was successfully treated with portal vein embolization via a percutaneous transumbilical approach. A contrast material-enhanced computed tomographic (CT) scan showed the presence of a large hypervascular tumor on portal venous phase as well as right hepatic vein thrombosis and hemoperitoneum that prevented portal vein embolization by the use of the percutaneous and transjugular transhepatic approach. The use of percutaneous transumbilical portal vein embolization can be an alternative option in this situation.

Kim, Soo Chin; Kim, Hyo-Cheol, E-mail: angiointervention@gmail.com; Chung, Jin Wook; Jae, Hwan Jun; Park, Jae Hyung [Seoul National University College of Medicine, Department of Radiology (Korea, Republic of)

2011-02-15

148

Patterning of Leaf Vein Networks by Convergent Auxin Transport Pathways  

PubMed Central

The formation of leaf vein patterns has fascinated biologists for centuries. Transport of the plant signal auxin has long been implicated in vein patterning, but molecular details have remained unclear. Varied evidence suggests a central role for the plasma-membrane (PM)-localized PIN-FORMED1 (PIN1) intercellular auxin transporter of Arabidopsis thaliana in auxin-transport-dependent vein patterning. However, in contrast to the severe vein-pattern defects induced by auxin transport inhibitors, pin1 mutant leaves have only mild vein-pattern defects. These defects have been interpreted as evidence of redundancy between PIN1 and the other four PM-localized PIN proteins in vein patterning, redundancy that underlies many developmental processes. By contrast, we show here that vein patterning in the Arabidopsis leaf is controlled by two distinct and convergent auxin-transport pathways: intercellular auxin transport mediated by PM-localized PIN1 and intracellular auxin transport mediated by the evolutionarily older, endoplasmic-reticulum-localized PIN6, PIN8, and PIN5. PIN6 and PIN8 are expressed, as PIN1 and PIN5, at sites of vein formation. pin6 synthetically enhances pin1 vein-pattern defects, and pin8 quantitatively enhances pin1pin6 vein-pattern defects. Function of PIN6 is necessary, redundantly with that of PIN8, and sufficient to control auxin response levels, PIN1 expression, and vein network formation; and the vein pattern defects induced by ectopic PIN6 expression are mimicked by ectopic PIN8 expression. Finally, vein patterning functions of PIN6 and PIN8 are antagonized by PIN5 function. Our data define a new level of control of vein patterning, one with repercussions on other patterning processes in the plant, and suggest a mechanism to select cell files specialized for vascular function that predates evolution of PM-localized PIN proteins. PMID:23437008

Sawchuk, Megan G.; Edgar, Alexander; Scarpella, Enrico

2013-01-01

149

Spontaneous pneumothorax in common pulmonary vein atresia.  

PubMed

Common pulmonary vein atresia is a rare congenital anomaly that is rapidly fatal unless immediately recognized and corrected by surgical intervention. This article describes three neonates who died with the diagnosis soon after birth. In the constellation of presenting clinical features in each case, the occurrence of early spontaneous pneumothorax was particularly noteworthy. This sign may well be a helpful physiologic marker within the context of suspected congenital heart disease associated with severe pulmonary venous obstruction. PMID:2313397

Sharda, J K; Kurlandsky, L E; Lacina, S J; Radecki, L L

1990-03-01

150

Brucellosis associated with deep vein thrombosis.  

PubMed

Over the past 10 years more than 700 cases of brucellosis have been reported in Kosovo, which is heavily oriented towards agriculture and animal husbandry. Here, brucellosis is still endemic and represents an uncontrolled public health problem. Human brucellosis may present with a broad spectrum of clinical manifestations; among them, vascular complications are uncommon. Hereby we describe the case of a 37-year-old male patient with brucellosis complicated by deep vein thrombosis on his left leg. PMID:25568754

Tolaj, Ilir; Mehmeti, Murat; Ramadani, Hamdi; Tolaj, Jasmina; Dedushi, Kreshnike; Fejza, Hajrullah

2014-11-19

151

Portal vein aneurysm: a rare occurrence.  

PubMed

Portal vein aneurysms (PVA) are a rare vascular anomaly of the portal system, representing fewer than 3% of all venous aneurysms, with only 150 known cases since first reported in l956 by Barzilai and Kleckner. PVA can be divided into 2 categories: extrahepatic and intrahepatic with acquired and congenital etiologies. Bimodal treatment includes medical and surgical approaches. With increased use of noninvasive radiological imaging, PVA will be increasingly recognized in the practice of vascular surgery. PMID:22062791

Turner, Kathy C; Bohannon, W T; Atkins, Marvin D

2011-12-01

152

Brucellosis Associated with Deep Vein Thrombosis  

PubMed Central

Over the past 10 years more than 700 cases of brucellosis have been reported in Kosovo, which is heavily oriented towards agriculture and animal husbandry. Here, brucellosis is still endemic and represents an uncontrolled public health problem. Human brucellosis may present with a broad spectrum of clinical manifestations; among them, vascular complications are uncommon. Hereby we describe the case of a 37-year-old male patient with brucellosis complicated by deep vein thrombosis on his left leg.

Tolaj, Ilir; Mehmeti, Murat; Ramadani, Hamdi; Tolaj, Jasmina; Dedushi, Kreshnike; Fejza, Hajrullah

2014-01-01

153

Use of meso-Rex shunt with transposition of the coronary vein for the management of extrahepatic portal vein obstruction  

PubMed Central

The meso-Rex shunt is used to safely and effectively treat patients with portal hypertension due to extrahepatic portal vein obstruction. In the standard meso-Rex shunt technique, the patient's own internal jugular vein is used as a vascular autograft. Inevitably, such a procedure requires neck exploration and sacrifice of the internal jugular vein. Here, we present a case of a 20-year-old man with idiopathic extrahepatic portal vein obstruction, who was treated with a new technique of transposition of the coronary vein, which is enlarged in most cases of portal hypertension, as an alternative to the standard meso-Rex shunt technique. The transposition of the coronary vein into the Rex recessus is more efficient and less invasive than harvesting an autologous vein graft. Therefore, this technique simplifies the procedure and should be used when possible. PMID:24761417

Ha, Tae-Yong; Ko, Gi-Young; Kim, Kyung-Mo; Lee, Sung-Gyu

2014-01-01

154

Development of HIFU Therapy System for Lower Extremity Varicose Veins  

NASA Astrophysics Data System (ADS)

High-intensity focused ultrasound (HIFU) treatment utilizing microbubbles was investigated in the present study. It is known that microbubbles have the potential to enhance the heating effects of an ultrasound field. In this study, the heat accompanying microbubble oscillation was used to occlude varicose veins. Alteration of veins was observed after ultrasound irradiation. Veins were resected by stripping. In this study, two vein conditions were adopted during HIFU irradiation; non-compressed and compressed. Compressing the vein was expected to improve occlusion by rubbing the altered intima under compressed conditions. The frequency of the ultrasound was 1.7 MHz, the intensity at the focus was 2800 W/cm2, and the irradiation time was 20 s. In this study, the contrast agent Levovist® was chosen as a microbubble source, and the void fraction (ratio of total gas volume to liquid) in the vein was fixed at 10-5. Under non-compressed conditions, changes were observed only at the adventitia of the vein anterior wall. In contrast, under compressed conditions, changes were observed from the intima to the adventitia of both the anterior and posterior walls, and they were partly stuck together. In addition, more experiments with hematoxylin-eosin staining suggested that the changes in the vein were more substantial under the latter conditions. From these results, it was confirmed that the vein was occluded more easily with vein compression.

Ota, Ryuhei; Suzuki, Jun; Yoshinaka, Kiyoshi; Deguchi, Juno; Takagi, Shu; Miyata, Tetsuro; Matsumoto, Yoichiro

2009-04-01

155

Development of HIFU Therapy System for Lower Extremity Varicose Veins  

SciTech Connect

High-intensity focused ultrasound (HIFU) treatment utilizing microbubbles was investigated in the present study. It is known that microbubbles have the potential to enhance the heating effects of an ultrasound field. In this study, the heat accompanying microbubble oscillation was used to occlude varicose veins. Alteration of veins was observed after ultrasound irradiation. Veins were resected by stripping. In this study, two vein conditions were adopted during HIFU irradiation; non-compressed and compressed. Compressing the vein was expected to improve occlusion by rubbing the altered intima under compressed conditions. The frequency of the ultrasound was 1.7 MHz, the intensity at the focus was 2800 W/cm{sup 2}, and the irradiation time was 20 s. In this study, the contrast agent Levovist registered was chosen as a microbubble source, and the void fraction (ratio of total gas volume to liquid) in the vein was fixed at 10{sup -5}. Under non-compressed conditions, changes were observed only at the adventitia of the vein anterior wall. In contrast, under compressed conditions, changes were observed from the intima to the adventitia of both the anterior and posterior walls, and they were partly stuck together. In addition, more experiments with hematoxylin-eosin staining suggested that the changes in the vein were more substantial under the latter conditions. From these results, it was confirmed that the vein was occluded more easily with vein compression.

Ota, Ryuhei; Yoshinaka, Kiyoshi; Takagi, Shu; Matsumoto, Yoichiro [Department of Mechanical Engineering, University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan); Suzuki, Jun; Deguchi, Juno; Miyata, Tetsuro [Vascular Surgery, Department of Surgery, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)

2009-04-14

156

Extracorporeal shock waves as curative therapy for varicose veins?  

PubMed Central

In this prospective design study the effects of low-energy partially focused extracorporeal generated shock waves (ESW) onto a subcutaneous located varicose vein – left vena saphena magna (VSM) – are investigated. The treatment consisted of 4 ESW applications within 21 days. The varicose VSM of both sides were removed by surgery, and samples analyzed comparing the treated and untreated by means of histopathology. No damage to the treated varicose vein in particular and no mechanical destruction to the varicose vein’s wall could be demonstrated. However, an induction of neo-collagenogenesis was observed. The thickness of the varicose vein’s wall increased. Optimization of critical application parameters by investigating a larger number of patients may turn ESW into a non-invasive curative varicose treatment. PMID:18488887

Angehrn, Fiorenzo; Kuhn, Christoph; Sonnabend, Ortrud; Voss, Axel

2008-01-01

157

Portal vein arterialization technique for liver transplantation patients  

PubMed Central

Liver transplantations were performed on two patients with hepatic failure caused by liver cirrhosis. Hard obsolete thrombi and portal venous sclerosis were observed in the major portal veins of both patients. The arteria colica media of one recipient and the portal vein of the donor were anastomosed end-to-end. The hepatic artery of the first donor was anastomosed end-to end with the gastroduodenal artery of the first recipient; meanwhile, the portal vein of the second donor was simultaneously anastomosed end- to-end with the common hepatic artery of the second recipient. The blood flow of the portal vein, the perfusion of the donor liver and liver function were satisfactory after surgery. Portal vein arterialization might be an effective treatment for patients whose portal vein reconstruction was difficult. PMID:25232274

Zhang, Kun; Jiang, Yi; Lv, Li-Zhi; Cai, Qiu-Cheng; Yang, Fang; Hu, Huan-Zhang; Zhang, Xiao-Jin

2014-01-01

158

Internal Jugular Vein Entrapment in a Multiple Sclerosis Patient  

PubMed Central

We describe a multiple sclerosis patient presenting with compression of the internal jugular vein caused by aberrant omohyoid muscle. Previously this patient underwent balloon angioplasty of the same internal jugular vein. Ten months after this endovascular procedure, Doppler sonography revealed totally collapsed middle part of the treated vein with no outflow detected. Still, the vein widened and the flow was restored when the patient's mouth opened. Thus, the abnormality was likely to be caused by muscular compression. Surgical exploration confirmed that an atypical omohyoid muscle was squeezing the vein. Consequently, pathological muscle was transected. Sonographic control three weeks after surgical procedure revealed a decompressed vein with fully restored venous outflow. Although such a muscular compression can be successfully managed surgically, future research has to establish its clinical relevance. PMID:23097738

Simka, Marian; Majewski, Eugeniusz; Fortuna, Marek; Zaniewski, Maciej

2012-01-01

159

Study of gene delivery in a rabbit vein graft model  

Microsoft Academic Search

Gene therapy is a therapeutic strategy in treating cardiovascular disease. Vein graft failure, the major limitation on coronary\\u000a artery bypass surgery, may be amenable to gene approaches. Some studies describe gene therapies using functioning genes to\\u000a prevent vein graft stenosis. Gene transfer efficiency remains a major issue. In this rabbit vein graft model, we studied gene\\u000a delivery using a replication-deficit

Masahide Chikada; Micheal Jones

1999-01-01

160

Percutaneous intrahepatic portosystemic shunt created via a femoral vein approach.  

PubMed

Creation of a percutaneous intrahepatic portosystemic shunt was attempted in a patient with portal hypertension and acute variceal hemorrhage. Abnormal hepatic venous anatomy precluded formation of the shunt with the standard transjugular method. An alternate technique was devised in which a femoral vein approach was used to construct an intrahepatic channel between the inferior right hepatic vein and the right portal vein. The patient stopped bleeding after the procedure and has not rebled during an 8-month follow-up period. PMID:1947081

LaBerge, J M; Ring, E J; Gordon, R L

1991-12-01

161

Recurrent varicose veins: patterns of reflux and clinical severity  

Microsoft Academic Search

Duplex scanning was used to determine patterns of recurrent varicose veins in 264 limbs and to relate these to clinical factors. All limbs had previously undergone sapheno-femoral ligation in the groin. A recurrent sapheno-femoral junction was present in 172 (65.2%). Incompetence was found in long or short saphenous veins in 232 limbs (87.9%), perforators in 176 (66.7%), and deep veins

P Jiang; A. M van Rij; R Christie; G Hill; C Solomon; I Thomson

1999-01-01

162

Towards measurement of outcome for patients with varicose veins  

Microsoft Academic Search

OBJECTIVE--To develop a valid and reliable outcome measure for patients with varicose veins. DESIGN--Postal questionnaire survey of patients with varicose veins. SETTING--Surgical outpatient departments and training general practices in Grampian region. SUBJECTS--373 patients, 287 of whom had just been referred to hospital for their varicose veins and 86 who had just consulted a general practitioner for this condition and, for

A M Garratt; L M Macdonald; D A Ruta; I T Russell; J K Buckingham; Z H Krukowski

1993-01-01

163

Accuracy of clinical assessment of deep-vein thrombosis  

Microsoft Academic Search

The clinical diagnosis of deep-vein thrombosis is generally thought to be unreliable. From experience, we hypothesised that this widely held view might be incorrect. We developed a clinical model and prospectively tested its ability in three tertiary care centres to stratify symptomatic outpatients with suspected deep-vein thrombosis into groups with high, moderate, or low probability groups of deep-vein thrombosis. We

Philip S. Wells; Jack Hirsh; David R. Anderson; Anthony W. A. Lensing; Gary Foster; Clive Kearon; Jeffrey Weitz; Robert D'Ovidio; Alberto Cogo; Paolo Prandoni; Antonio Girolami; Jeffrey S. Ginsberg

1995-01-01

164

Origin of pegmatitic segregation veins within flood basalts  

Microsoft Academic Search

Subhorizontal veins and lenses of coarse-grained rock composed of plagioclase, augite, and Fe-Ti oxides in a glassy and vesicular mesostasis occur within several thick subaerial basalt flows in the Columbia River Basalt province of Washington and in the eastern North American Mesozoic basalt province. The veins and lenses, referred to as pegmatitic segregation veins, are typically 1-10 cm thick and

JOHN H. PUFFER; DAWN L. HORTER

1993-01-01

165

Can vein patterns be used to estimate rock permeabilities?  

NASA Astrophysics Data System (ADS)

Fracturing of rocks due to tectonic stresses or local high fluid pressures and the formation of fluid pathways is important for a whole range of industrially relevant processes in the Earth's upper crust reaching from groundwater transport, hydrocarbon migration to geothermal systems. Fracturing and the opening of fluid pathways become especially important in tight rocks where fluid migration through the rock matrix is restricted. In addition observations show that fractures are often partly or completely sealed and occur as veins in geological systems. How can we interpret the permeability of these vein systems? The internal structure of veins often indicates that they are formed by several cracking and sealing events. In addition some geological systems contain partly sealed veins that have a preserved porosity and may add to the overall permeability of the system. We are comparing field areas that contain different vein patterns with hydrodynamic numerical models where fractures develop as a function of gravity, extension and fluid pressure gradients. In addition fractures seal where the developing veins can have variable properties in terms of elasticity, breaking strength and porosity. Results indicate that permeability in such systems is not a constant but may vary strongly over time. In an active system the amount of veins and number of open fractures depends not only on the timing of sealing but also on the breaking strength of the veins. Strong veins can clog the system whereas weak veins tend to lead to possible connected fracture networks. In addition one cannot link veins directly to fluid flow, intense veining does not mean that the system has or had a high permeability. We will present a first attempt to classify different fracturing and sealing systems based on field observations and numerical models.

Koehn, Daniel; Vass, Anna; Ghani, Irfan; Toussaint, Renaud; Bons, Paul; Gomez-Rivas, Enrique; Urai, Janos L.; Arndt, Max; Virgo, Simon; Wendler, Frank; Blum, Philipp; Schwarz, Jens-Oliver

2014-05-01

166

Formation of retinochoroidal collaterals in central retinal vein occlusion  

Microsoft Academic Search

Purpose: To demonstrate the drainage routes that compensate the venous congestion in central retinal vein occlusion.Methods: Indocyanine green angiography was performed in 13 eyes of 13 patients with central retinal vein occlusion at the involutional stage using a scanning laser ophthalmoscope. The interval between onset of central retinal vein occlusion and indocyanine green angiography ranged from 1.0 to 9.3 years

Kyoichi Takahashi; Kanemitsu Muraoka; Shoji Kishi; Koichi Shimizu

1998-01-01

167

Deep dorsal vein arterialization in vascular impotence.  

PubMed

33 patients underwent a penile deep dorsal vein arterialization (DDVA) (11 venous leak, 8 pure arteriogenic impotence, 14 mixed arterial and venous impotence). The mean follow-up was 12 months. Surgery was considered successful when the patients had permeable anastomosis and were able to achieve satisfactory erections resulting in normal intercourse. 92% of the patients with venous leak, 62.5% of those with arteriogenic impotence and 58% with mixed lesions had a successful results. Due to antithrombotic therapy, there was no graft occlusion. Glans hypervascularity occurred in 3 patients and was treated by arterial banding. The role of DDVA in vascular impotence and its functional mechanism are discussed. PMID:8307073

Sarramon, J P; Janssen, T; Rischmann, P; Bennis, S; Malavaud, B

1994-01-01

168

Sclerotherapy of varicose veins in dermatology.  

PubMed

Venous disorders rank among the most frequent diseases in the German population. Early diagnostic investigation and treatment can prevent their progression and may reduce the risk for secondary diseases. The therapeutic spectrum for varicose veins includes conservative as well as interventional and surgical methods. Because it is minimally invasive and well-tolerated, sclerotherapy represents an important treatment method for venous insufficiency, recurrent varicosis and venous malformations. We review the role of sclerotherapy as a treatment option of chronic venous insufficiency in dermatology. PMID:24797742

Lorenz, Marthe Barbara; Gkogkolou, Paraskevi; Goerge, Tobias; Görge, Tobias

2014-05-01

169

Gene therapy for the prevention of vein graft disease  

PubMed Central

Ischemic cardiovascular disease remains the leading cause of death worldwide. Despite advances in the medical management of atherosclerosis over the past several decades, many patients require arterial revascularization to reduce mortality and alleviate ischemic symptoms. Technological advancements have led to dramatic increases in the use of percutaneous and endovascular approaches, yet surgical revascularization (bypass surgery) with autologous vein grafts remains a mainstay of therapy for both coronary and peripheral artery disease. Although bypass surgery is highly efficacious in the short-term, long-term outcomes are limited by relatively high failure rates as a result of intimal hyperplasia, which is a common feature of vein graft disease. The supply of native veins is limited, and many individuals require multiple grafts and repeat procedures. The need to prevent vein graft failure has led to great interest in gene therapy approaches to this problem. Bypass grafting presents an ideal opportunity for gene therapy, as surgically harvested vein grafts can be treated with gene delivery vectors ex vivo, thereby maximizing gene delivery while minimizing the potential for systemic toxicity and targeting the pathogenesis of vein graft disease at its onset. Here we will review the pathogenesis of vein graft disease and discuss vector delivery strategies and potential molecular targets for its prevention. We will summarize the preclinical and clinical literature on gene therapy in vein grafting and discuss additional considerations for future therapies to prevent vein graft disease. PMID:23274305

Southerland, Kevin W.; Frazier, Sarah B.; Bowles, Dawn E.; Milano, Carmelo A.; Kontos, Christopher D.

2013-01-01

170

3D MR angiographic visualization and artery-vein separation  

NASA Astrophysics Data System (ADS)

The common approach for artery-vein separation applies a presaturation pulse to obtain different image intensity representations in MRA data for arteries and veins. However, when arteries and veins do not run in opposite directions as in the brain, lungs, and heart, this approach fails. This paper presents an image processing approach devised for artery-vein separation. The anatomic separation utilizes fuzzy connected object delineation. The first step of this separation method is the segmentation of the entire vessel structure from the background via absolute connectedness by using scale-based affinity. The second step is to separate artery from vein via relative connectedness. After 'seed' points are specified inside artery and vein in the vessel- only image, the operation is performed in an iterative fashion. The small regions of the bigger aspects of artery and vein are separated in the initial iteration. Further regions are added with the subsequent iterations so that the small aspects of artery and vein are included in alter iterations. Shell rendering is used for 3D display. Combining the strengths of fuzzy connected object definition, object separation, and shell rendering, high- quality volume rendering of vascular information in MRA data has been achieved. MS-325 contrast-enhanced MRA were used to illustrate this approach. Several examples of 3D display of arteries and veins are included to show the considerable promise of this new approach.

Lei, Tianhu; Udupa, Jayaram K.; Saha, Punam K.; Odhner, Dewey

1999-05-01

171

21 CFR 870.4885 - External vein stripper.  

...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES CARDIOVASCULAR DEVICES Cardiovascular Surgical Devices § 870.4885 External vein stripper. (a) Identification. An...

2014-04-01

172

Finger-Vein Verification Based on Multi-Features Fusion  

PubMed Central

This paper presents a new scheme to improve the performance of finger-vein identification systems. Firstly, a vein pattern extraction method to extract the finger-vein shape and orientation features is proposed. Secondly, to accommodate the potential local and global variations at the same time, a region-based matching scheme is investigated by employing the Scale Invariant Feature Transform (SIFT) matching method. Finally, the finger-vein shape, orientation and SIFT features are combined to further enhance the performance. The experimental results on databases of 426 and 170 fingers demonstrate the consistent superiority of the proposed approach. PMID:24196433

Qin, Huafeng; Qin, Lan; Xue, Lian; He, Xiping; Yu, Chengbo; Liang, Xinyuan

2013-01-01

173

Multiple Abdominal Veins Thrombosis Secondary to Protein S Deficiency - A Case Report  

PubMed Central

Abdominal venous thrombosis may present either as Budd-Chiari syndrome (BCS) caused by hepatic vein or proximal inferior vena cava (IVC) obstruction or as an extra hepatic portal obstruction (EHPVO) caused by Portal vein thrombosis or mesenteric vein thrombosis, but a mixed involvement is uncommon. Multiple abdominal venous obstructions presenting with thrombosis of hepatic vein, IVC, portal vein and renal vein are very rarely seen . We are reporting a rare case with thrombosis of IVC, hepatic vein, portal vein and renal vein, with protein S and protein C deficiencies, which was managed by giving anticoagulant therapy. PMID:25121018

Kodali, Venkata Umakant; Borra, Seshulakshmi; Mandarapu, Surendra Babu; Sanda, Mallikarjuna Rao

2014-01-01

174

Suitability of Varicose Veins for Endovenous Treatments  

SciTech Connect

The aim of the study was to assess the suitability of radiofrequency ablation (RFA), endovenous laser ablation (EVLA), and foam sclerotherapy (FS) for patients with symptomatic varicose veins (VVs). The study comprised 403 consecutive patients with symptomatic VVs. Data on 577 legs from 403 consecutive patients with symptomatic VVs were collected for the year 2006. Median patient age was 55 years (interquartile range 45-66), and 62% patients were women. A set of criteria based on duplex ultrasonography was used to select patients for each procedure. Great saphenous vein (GSV) reflux was present in 77% (446 of 577) of legs. Overall, 328 (73%) of the legs were suitable for at least one of the endovenous options. Of the 114 legs with recurrent GSV reflux disease, 83 (73%) were suitable to receive endovenous therapy. Patients with increasing age were less likely to be suitable for endovenous therapy (P = 0.03). Seventy-three percent of patients with VVs caused by GSV incompetence are suitable for endovenous therapy.

Goode, S. D., E-mail: s.goode@sheffield.ac.u [Sheffield Teaching Hospitals, Department of Radiology (United Kingdom); Kuhan, G.; Altaf, N.; Simpson, R.; Beech, A.; Richards, T.; MacSweeney, S. T.; Braithwaite, B. D. [Queens Medical Centre, Department of Vascular and Endovascular Surgery (United Kingdom)

2009-09-15

175

Portal vein thrombosis: What is new?  

PubMed

Portal vein thrombosis (PVT) is one of the most common vascular disorders of the liver with significant morbidity and mortality. Large cohort studies have reported a global prevalence of 1%, but in some risk groups it can be up to 26%. Causes of PVT are cirrhosis, hepatobiliary malignancy, abdominal infectious or inflammatory diseases, and myeloproliferative disorders. Most patients with PVT have a general risk factor. The natural history of PVT results in portal hypertension leading to splenomegaly and the formation of portosystemic collateral blood vessels and esophageal, gastric, duodenal, and jejunal varices. Diagnosis of PVT is made by imaging, mainly Doppler ultrasonography. According to its time of development, localization, pathophysiology, and evolution, PVT should be classified in every patient. Some clinical features such as cirrhosis, hepatocellular carcinoma, and hepatic transplantation are areas of special interest and are discussed in this review. The goal of treatment of acute PVT is to reconstruct the blocked veins. Endoscopic variceal ligation is safe and highly effective in patients with variceal bleeding caused by chronic PVT. In conclusion, PVT is the most common cause of vascular disease of the liver and its prevalence has being increasing, especially among patients with an underlying liver disease. All patients should be investigated for thrombophilic conditions, and in those with cirrhosis, anticoagulation prophylaxis should be considered. PMID:25536638

Manzano-Robleda, María Del Carmen; Barranco-Fragoso, Beatriz; Uribe, Misael; Méndez-Sánchez, Nahum

2015-01-01

176

Early Injury to the Media After Saphenous Vein Grafting  

Microsoft Academic Search

Background. Injury to the smooth muscle cells of the media affects the remodeling process of vein grafts. The purpose of this study was to determine whether different techniques of surgical preparation influence the degree of medial smooth muscle injury.Methods. Carotid–saphenous vein interposition grafting was performed in crossbred pigs (n = 32), using distended (n = 16) or nondistended (n =

James E. O’Brien; Michael L. Ormont; Yi Shi; Dian Wang; Andrew Zalewski; John D. Mannion

1998-01-01

177

Renal Vein Leiomyoma: A Rare Entity with Review of Literature  

PubMed Central

Tumors of vascular origin are unusual. These tumors are predominantly malignant and commonly arise from the inferior vena cava. Benign smooth muscle tumors arising from renal vein are very rare. We present a case of leiomyoma of renal vein in a post-menopausal woman that clinically resembled a retroperitoneal paraganglioma. PMID:25161811

Kumar, Santosh; Mittal, Ankur; Devana, Sudheer Kumar; Singh, Shrawan Kumar

2014-01-01

178

Composition of arsenopyrite from topaz greisen veins in southeastern Missouri  

Microsoft Academic Search

Arsenopyrite occurs in greisen-sulfide veins hosted by unmetamorphosed Precambrian granite and rhyolite in the Silver Mine district of southeastern Missouri, Greisenization and sulfide mineralization appear to have been a continuous depositional sequence which recorded falling temperature in a near-surface vein environment. Textural criteria imply that equilibrium existed between arsenopyrite and pyrite and that this pair crystallized in an intermediate paragenetic

G. R. Lowell; C. Gasparrini

1982-01-01

179

Hand Vein Biometry Based on Geometry and Appearance Methods  

E-print Network

1 Hand Vein Biometry Based on Geometry and Appearance Methods Aycan Yuksel*, Lale Akarun. These patterns in the hands are assumed to be unique to each individual and they do not change over time except features for personal identification. In this study, we present a novel hand vein database and a biometric

180

Sepsis associated with central vein catheters in critically ill patients  

Microsoft Academic Search

In 440 critically ill patients, the association between different central vein catheter insertion sites, the duration of catheter insertion and catheter-associated sepsis was examined. Of 780 catheter tips studied, 19% were colonized by microorganisms. The incidence of colonization varied with the different insertion sites. The lowest percentage of colonized catheters occurred with catheters inserted via the subclavian vein (15%) and

P. Collignon; N. Soni; I. Pearson; T. Sorrell; P. Woods

1988-01-01

181

Robust and accurate recognition of veins in fruit fly wings  

Microsoft Academic Search

Manual inspection of the morphological differences in the veins of wings in fruit fly mutants is useful for uncovering the relevant genes associated with fundamental biological functions. However, manual morphological inspection is not feasible when processing numerous mutants that were systematically created using fruit fly genome information. Another difficulty is how to process mutant wings that violate the typical vein

Hiroshi Hatsuda; Keigo Muramatsu; Toshiro Aigaki; Shinichi Morishita

2009-01-01

182

Microstructural evolution of syntaxial veins formed by advective flow  

NASA Astrophysics Data System (ADS)

Veins are common in Earth's crust, and are formed by a wide range of processes, which lead to crystal growth in dilation sites. The first-order processes in vein formation have been identified, but it is much less clear how these can be diagnosed from field studies. In order to better understand the microstructural evolution during vein growth, we grew veins of analogue material [alum, KAl(SO4)2·12H2O] in a transmitted-light cell from an advecting supersaturated fluid. Real-time observation shows the effects of flow rate and supersaturation on the evolving microstructure: (1) along-vein trends in growth rate caused by decreasing supersaturation, and (2) growth competition between clear crystals in the absence of nucleation and primary fluid inclusions. Although the overall trends in growth rate are in agreement with previous work, the local effects at the scale of individual grains reported here are less well understood; these new data form a basis for better interpretation of natural microstructures. To explore the possible effects of experimentally observed processes during vein growth, we simulate the growth kinetics of a quartz vein at various conditions of advective flow in Earth's crust. Results show that in general the along-vein changes in growth rate occur at length scales much larger than a typical outcrop.

Hilgers, Christoph; Dilg-Gruschinski, Karin; Urai, Janos L.

2004-03-01

183

Options for revascularization: artery versus vein: technical considerations.  

PubMed

Vascular grafts, as either interpositional conduits or bypass grafts, can be used for revascularization procedures in the upper extremity. Vein grafts are more readily available and can be easier to harvest. Arterial grafts may provide superior patency rates compared with vein grafts. Arterial grafts can be located and harvested with consistent and reliable anatomy throughout the body. PMID:25455359

Shuck, John; Masden, Derek L

2015-02-01

184

Basilic vein transposition in the forearm for secondary arteriovenous fistula.  

PubMed

Radiocephalic (RC) fistulae remain the first choice access for hemodialysis. The antecubital fossa is recommended as the next site. However, for some patients a basilic vein can be used to create an arteriovenous (av) fistula. We report a series of patients where the forearm basilic vein served as an alternative conduit for secondary procedures. Over an 8-year period, 30 patients who had a failed RC fistula underwent a basilic vein transposition. The immediate results were satisfactory. All fistulas were successfully cannulated. Cumulative patency was 93% after 1 year, 78% after 2 years, and 55% after 3 years. No ischemic or infectious complications were noted during the study period. The use of the forearm basilic vein to create a native av fistula appears to be a good alternative to procedures in the antecubital fossa or upper arm, thus preserving more proximal veins for future use. PMID:23599505

Glowinski, Jerzy; Glowinska, Irena; Malyszko, Jolanta; Gacko, Marek

2014-04-01

185

Finger vein image quality evaluation using support vector machines  

NASA Astrophysics Data System (ADS)

In an automatic finger-vein recognition system, finger-vein image quality is significant for segmentation, enhancement, and matching processes. In this paper, we propose a finger-vein image quality evaluation method using support vector machines (SVMs). We extract three features including the gradient, image contrast, and information capacity from the input image. An SVM model is built on the training images with annotated quality labels (i.e., high/low) and then applied to unseen images for quality evaluation. To resolve the class-imbalance problem in the training data, we perform oversampling for the minority class with random-synthetic minority oversampling technique. Cross-validation is also employed to verify the reliability and stability of the learned model. Our experimental results show the effectiveness of our method in evaluating the quality of finger-vein images, and by discarding low-quality images detected by our method, the overall finger-vein recognition performance is considerably improved.

Yang, Lu; Yang, Gongping; Yin, Yilong; Xiao, Rongyang

2013-02-01

186

Aneurysms of the vein of Galen.  

PubMed

Six neonates with aneurysms of the vein of Galen are described: five were associated with an intracerebral arteriovenous fistula and presented with heart failure in the neonatal period; one had hydrocephalus at birth. Two infants died from intractable cardiac failure within 48 hours of age and two from progressive hydrocephalus and cardiac failure at 8 months and 8 years respectively. Two of the infants had copper coil embolisation of the aneurysm--one has since died of an intracerebral haemorrhage. The diagnosis of an intracerebral arteriovenous fistula should be considered in any infant presenting with unexplained heart failure. Close attention to the volume of all arterial pulses, and the venous pulse in the neck as well as auscultation of the head for a cranial bruit may suggest the diagnosis, which can then be substantiated by cerebral ultrasound. PMID:2690740

O'Donnabhain, D; Duff, D F

1989-11-01

187

Intracranial venous drainage through spinal veins.  

PubMed

There is extensive collateral networking at the craniocervical junction with a substantial anatomical and functional continuity between the veins, venous sinuses, and venous plexuses of the brain and spine. The predominant pathway for intracranial blood outflow may depend on the level and degree of obstruction. We are presenting an unusual case of predominant egress of intracranial blood through enlarged spinal canal venous collaterals due to thrombosis of the intracranial venous sinuses. Awareness of this unique pattern of venous drainage of the cranium is important and should be considered in the differential diagnosis of spinal arteriovenous malformation (AVM) or arteriovenous fistula (AVF). Magnetic Resonance Venography (MRV) of the brain should be considered to exclude intracranial thrombosis in these cases. PMID:25141475

Choudhary, Arabinda Kumar; Dias, Mark S; Iantosca, Mark

2014-06-01

188

Portal Vein Embolization: What Do We Know?  

SciTech Connect

Portal vein embolization (PVE) has been developed to increase the size of the future remnant liver (FRL) left in place after major hepatectomy, thus reducing the risk of postoperative liver insufficiency. PVE consist in embolizing preoperatively portal branches of the segments that will be resected. Indication is based on preoperative measurements of the FRL by computed tomography and its ratio with either the theoretical liver volume or by direct measurement of the functional liver volume. After PVE, the volume and function of the FRL increases in 3 to 6 weeks, permitting extensive resections in patients otherwise contraindicated for liver resection. The PVE technique is variable from one center to another; however n-butyl-cyano-acrylate provides an interesting compromise between hypertrophy rate and procedure risk.

Denys, Alban, E-mail: Alban.Denys@chuv.ch [Centre Hospitalo Universitaire Vaudois, Department of Radiology and Interventional Radiology Unit (Switzerland); Prior, John [Centre Hospitalo Universitaire Vaudois, Department of Nuclear Medicine (Switzerland); Bize, Pierre; Duran, Rafael [Centre Hospitalo Universitaire Vaudois, Department of Radiology and Interventional Radiology Unit (Switzerland); Baere, Thierry De [Institut Gustave Roussy, Department of Interventional Radiology (France); Halkic, Nermin; Demartines, Nicolas [Centre Hospitalo Universitaire Vaudois, Department of Visceral Surgery (Switzerland)

2012-10-15

189

Saphenous Vein Graft Intervention: Status Report 2014.  

PubMed

Given their frequent use as bypass conduits and high rates of degeneration, saphenous vein grafts (SVGs) will continue to require percutaneous coronary intervention. Due to their unique physiology, SVGs pose special challenges to the interventionalist. Preintervention evaluation of hemodynamic significance is hampered by limited data and uncertainty regarding the validity of fractional flow reserve. Intraprocedural complications, particularly distal embolization and no-reflow, are common but may be mitigated by various techniques. Despite advances in the field, SVG intervention is associated with worse outcomes - including increased rates of periprocedural myocardial infarction, restenosis, target vessel revascularization, non-target disease progression, and death - compared with native vessel intervention. This paper reviews the most recent data and techniques available to the interventionalist seeking to improve outcomes after SVG intervention. PMID:25480996

Soverow, Jonathan; Lee, Michael S

2014-12-01

190

The relationship of Olpidium brassicae (Wor.) Dang. to the big-vein disease of lettuce  

Microsoft Academic Search

Inoculation of lettuce with tobacco-necrosis virus isolated from big-vein plants did not cause big-vein symptoms.Olpidium brassicae was always found in roots of lettuce grown in big-vein-infected soil but not in two gardens where big vein did not occur.Olpidium resting spores were sedimented from big-vein root sap by low-speed centrifuging. Inoculation of lettuce with resuspended sediment produced big-vein symptoms while inoculation

P. R. Fry

1958-01-01

191

Repair of peripheral nerve with vein wrapping*  

PubMed Central

Objective The post–traumatic neuro-anastomosis must be protected from the surrounding environment. This barrier must be biologically inert, biodegradable, not compressing but protecting the nerve. Formation of painful neuroma is one of the major issues with neuro-anastomosis; currently there is no consensus on post-repair neuroma prevention. Aim of this study is to evaluate the efficacy of neuroanastomosis performed with venous sheath to reduce painful neuromas formation, improve the electrical conductivity of the repaired nerve, and reduce the discrepancies of the sectioned nerve stumps. Patients and methods From a trauma population of 320 patients treated in a single centre between January 2008 and December 2011, twenty-six patients were identified as having an injury to at least one of the peripheral nerves of the arm and enrolled in the study. Patients were divided into two groups. In the group A (16 patients) the end-to-end nerve suture was wrapped in a vein sheath and compared with the group B (10 patients) in which a simple end-to-end neurorrhaphy was performed. The venous segment used to cover the nerve micro-suture was harvested from the superficial veins of the forearm. The parameters analyzed were: functional recovery of motor nerves, sensitivity and pain. Results Average follow-up was 14 months (range: 12–24 months). The group A showed a more rapid motor and sensory recovery and a reduction of the painful symptoms compared to the control group (B). Conclusions The Authors demonstrated that, in their experience, the venous sheath provides a valid solution to avoid the dispersion of the nerve fibres, to prevent adherent scars and painful neuromas formation. Moreover it can compensate the different size of two nerve stumps, allowing, thereby, a more rapid functional and sensitive recovery without expensive devices. PMID:24841688

LEUZZI, S.; ARMENIO, A.; LEONE, L.; DE SANTIS, V.; DI TURI, A.; ANNOSCIA, P.; BUFANO, L.; PASCONE, M.

2014-01-01

192

Gray-scale skeletonization of near-infrared vein patterns using the improved watershed algorithm in vein pattern biometrics  

Microsoft Academic Search

In order to analyze the shape of the vein pattern rapidly and accurately and to reduce the computing errors of the subsequent processing stages, a novel approach is proposed to extract the skeletons of vein patterns directly from gray-scale samples, which combines with the watershed algorithm and region merging. The rule of the region merging is composed of measurements of

Wang Kejun; Xiong Xinyan; Ren Zhen; Fu Bin

2009-01-01

193

Percutaneous closure of patent ductus arteriosus in interrupted inferior caval vein through femoral vein approach  

PubMed Central

Percutaneous closure of the patent arterial duct in patients with interrupted inferior caval vein poses a technical challenge. A 12-year-old girl with a patent ductus arteriosus (PDA) and interrupted inferior caval vein is described in this report. The diagnosis of interrupted inferior caval vein and azygos continuation was made in the catheterization laboratory. A catheter was advanced and snared in the descending aorta. An exchange wire was advanced through the catheter and snared in the descending aorta. Then, an Amplatzer TorqVue 2 delivery sheath was advanced over the wire from the venous side and again snared in the descending aorta. An Amplatzer duct occluder (ADO) size 8/6 was advanced through the sheath while still holding the sheath with a snare. The device was opened. The sheath was then unsnared once the aortic disc was completely out. The sheath and the device were pulled back into the duct and the device was successfully implanted. The device was then released and it attained a stable position. An aortic angiogram was performed which showed complete occlusion. PMID:24701089

Tefera, Endale; Bermudez-Cañete, Ramon

2014-01-01

194

Coil Protruding into the Common Femoral Vein Following Pelvic Venous Embolization  

SciTech Connect

Pelvic venous embolization is performed for pelvic congestion syndrome and prior to lower limb varicose vein surgery in females with associated pelvic venous insufficiency. The procedure is analogous to varicocele embolization in males, although refluxing internal iliac vein tributaries may also be embolized. We report a case of inadvertent coil placement in the common femoral vein while embolizing the obturator vein, during pelvic vein embolization for recurrent lower limb varicose veins. There were no clinical consequences and the coil was left in situ. We advise caution when embolizing internal iliac vein tributaries where there is clinically significant communication with veins of the lower limb.

Marsh, Petra, E-mail: petra@thewhiteleyclinic.co.uk; Holdstock, Judith M. [The Whiteley Clinic (United Kingdom); Bacon, Jennifer L.; Lopez, Anthony J. [The Royal Surrey County Hospital (United Kingdom); Whiteley, Mark S.; Price, Barrie A. [The Whiteley Clinic (United Kingdom)

2008-03-15

195

Non-contact finger vein acquisition system using NIR laser  

NASA Astrophysics Data System (ADS)

Authentication using finger vein pattern has substantial advantage than other biometrics. Because human vein patterns are hidden inside the skin and tissue, it is hard to forge vein structure. But conventional system using NIR LED array has two drawbacks. First, direct contact with LED array raise sanitary problem. Second, because of discreteness of LEDs, non-uniform illumination exists. We propose non-contact finger vein acquisition system using NIR laser and Laser line generator lens. Laser line generator lens makes evenly distributed line laser from focused laser light. Line laser is aimed on the finger longitudinally. NIR camera was used for image acquisition. 200 index finger vein images from 20 candidates are collected. Same finger vein pattern extraction algorithm was used to evaluate two sets of images. Acquired images from proposed non-contact system do not show any non-uniform illumination in contrary with conventional system. Also results of matching are comparable to conventional system. We developed Non-contact finger vein acquisition system. It can prevent potential cross contamination of skin diseases. Also the system can produce uniformly illuminated images unlike conventional system. With the benefit of non-contact, proposed system shows almost equivalent performance compared with conventional system.

Kim, Jiman; Kong, Hyoun-Joong; Park, Sangyun; Noh, SeungWoo; Lee, Seung-Rae; Kim, Taejeong; Kim, Hee Chan

2009-02-01

196

Investigation of vascular changes following penile vein ligation.  

PubMed

In an effort to characterize the changes in penile vasculature that occur following penile vein ligation, we performed pharmaco-cavernosometry and pharmaco-cavernosography on 20 patients after penile vein ligation for comparison with preoperative studies. Three patients with return of erectile function underwent repeat study: 2 were completely normal and 1 had a mild leak from the deep dorsal vein. The remaining 17 patients had continued complaints of erectile impairment. Of these studies 4 showed no evidence of venous leakage, 11 identified a new site of leakage (7 corporo-spongiosal shunts, 2 crural veins and 2 with multiple sites of involvement) and 1 revealed persistent leak through the proximal stump of the resected deep dorsal vein, while 1 patient had an iodine allergy and underwent pharmaco-cavernosometry only. A repeat study in the latter patient showed flow volumes consistent with continued venous leakage. In summary, penile vein ligation appears to be effective at correcting venous leakage noted on cavernosography. However, new sites of leakage frequently appear postoperatively. A corporo-spongiosal shunt was the most frequent site of recurrent venous leakage. A surprisingly high percentage of patients with continued complaints of erectile dysfunction following penile vein ligation demonstrate no venous leakage on subsequent pharmaco-cavernosography. PMID:8051743

Kerfoot, W W; Carson, C C; Donaldson, J T; Kliewer, M A

1994-09-01

197

Computerized feature quantification of sublingual veins from color sublingual images.  

PubMed

Characteristics of tongue pose the most important information for Traditional Chinese Medicine diagnosis. So far, extensive studies have been made on extracting tongue surface features, but rarely refer to sublingual vein that is also diagnostically important. This paper focuses on establishing a feature quantification framework for the inspection of sublingual veins, composed of two parts: the segmentation of sublingual veins and the feature quantification of them. Pixel-based sublingual vein segmentation algorithm and adaptive sublingual vein segmentation algorithm for color sublingual images with visible contrast and low contrast are proposed respectively. The experiments prove that the proposed algorithms perform well on the segmentation of sublingual veins from color sublingual images with both visible contrast and low contrast. A chromatic system in conformity with diagnostic standard of tongue diagnosis is established to characterize the chromatic feature of sublingual veins. Experimental results reveal that the breadth and chromatic features quantified by the proposed framework are properly consistent with the diagnostic standard summarized by tongue diagnosis. PMID:18992958

Yan, Zifei; Wang, Kuanquan; Li, Naimin

2009-02-01

198

Spontaneous intrahepatic portosystemic shunt managed by laparoscopic hepatic vein closure.  

PubMed

Intrahepatic portosystemic shunt (IPSS) is uncommon and usually follows trauma or iatrogenic injury, but spontaneous shunts may also occur, in patients without the evidence of chronic liver disease. Although interventional endovascular management of the shunts is the treatment of choice, a surgical approach can be used when the percutaneous approach fails. We report here a case of symptomatic spontaneous IPSS between the posteroinferior branch of right portal vein and the right inferior hepatic vein, which was successfully managed with laparoscopic closure of the hepatic vein. To the best of our knowledge, this is the first case report of laparoscopic management of spontaneous IPSS. PMID:25336823

Kwon, Jung-Nam; Jeon, Yong Sun; Cho, Soon-Gu; Lee, Keon-Young; Hong, Kee Chun

2014-10-01

199

Postpartum ovarian vein thrombosis after cesarean delivery: a case report  

PubMed Central

Introduction Postpartum ovarian vein thrombosis is an uncommon complication; incidence varies between 0.002% and 0.05%. It most often occurs during the 2–15 days following delivery. Case presentation A 22-year-old pregnant woman at term presented to hospital with uterine contractions, abdominal pain, nausea and vomiting. After delivery an ovarian vein thrombosis was diagnosed. Conclusion Low-molecular weight heparin with broad-spectrum antibiotics are the accepted therapy in non-complicated cases of postpartum ovarian vein thrombosis. PMID:18400095

Royo, Pedro; Alonso-Burgos, Alberto; García-Manero, Manuel; Lecumberri, Ramón; Alcázar, Juan Luis

2008-01-01

200

Spontaneous intrahepatic portosystemic shunt managed by laparoscopic hepatic vein closure  

PubMed Central

Intrahepatic portosystemic shunt (IPSS) is uncommon and usually follows trauma or iatrogenic injury, but spontaneous shunts may also occur, in patients without the evidence of chronic liver disease. Although interventional endovascular management of the shunts is the treatment of choice, a surgical approach can be used when the percutaneous approach fails. We report here a case of symptomatic spontaneous IPSS between the posteroinferior branch of right portal vein and the right inferior hepatic vein, which was successfully managed with laparoscopic closure of the hepatic vein. To the best of our knowledge, this is the first case report of laparoscopic management of spontaneous IPSS. PMID:25336823

Kwon, Jung-Nam; Jeon, Yong Sun; Cho, Soon-Gu; Lee, Keon-Young; Hong, Kee Chun

2014-01-01

201

Biomarkers for the diagnosis of deep vein thrombosis.  

PubMed

Venous thromboembolic disease (VTE) remains a significant source of morbidity and mortality. As non-specific subjective complaints and a paucity of objective clinical examination findings complicate the diagnosis of both deep venous thrombosis (DVT) and pulmonary embolism, diagnostic modalities remain essential. Compression ultrasound remains the gold standard for DVT diagnosis. Reliable imaging is not always available making a serologic diagnosis, or biomarker, highly desirable. While D-dimer, a highly sensitive biomarker, is useful for excluding acute VTE, it lacks the specificity necessary for diagnostic confirmation. As such, ongoing research efforts target and support the utility of alternative plasma biomarkers to aid in the diagnosis of VTE including selectins, microparticles, IL-10 and other inflammatory markers. These molecular markers may also predict recurrence risk, guide length and modality of treatment, and predict which thrombi will resolve spontaneously or recanalize, thus potentially identifying patients who would benefit from more aggressive therapies than standard anticoagulation. PMID:23480737

Coleman, Dawn M; Wakefield, Thomas W

2012-07-01

202

Videothoracoscopic management of a perforated central vein and pleura after ultrasound-guided internal jugular vein cannulation: a case report  

PubMed Central

A 23-year-old male underwent a left internal jugular vein catheterization during extended surgery for treatment of multiple fractures due to a traffic accident. Although the catheterization was performed under ultrasound (US) guidance, iatrogenic perforation of the central vein and pleura occurred. The catheter was removed, and the perforated site was addressed under thoracoscopy rather than an open thoracotomy. This case suggests that using US does not completely guarantee a complication-free outcome, and that catheter placement should be carefully confirmed. In addition, this case suggests that thoracoscopy may be an ideal method of resolving a perforation of the central vein and pleura. PMID:24851167

Kim, Jeong-Eun; Jeon, Joon-Pyo; Kim, Yongsuk; Jeong, Su Ah

2014-01-01

203

Posttransplant Complex Inferior Venacava Balloon Dilatation After Hepatic Vein Stenting  

SciTech Connect

Orthotopic and living related liver transplantation is an established mode of treatment of end-stage liver disease. One of the major causes of postoperative complications is vascular anastomotic stenosis. One such set of such complications relates to hepatic vein, inferior vena cava (IVC), or portal vein stenosis, with a reported incidence of 1-3%. The incidence of vascular complications is reported to be higher in living donor versus cadaveric liver transplants. We encountered a patient with hepatic venous outflow tract obstruction, where the hepatic vein had been previously stented, but the patient continued to have symptoms due to additional IVC obstruction. The patient required double-balloon dilatation of the IVC simultaneously from the internal jugular vein and IVC.

Kohli, Vikas, E-mail: vkohli_md@yahoo.co [Indraprastha Apollo Hospital, Pediatric Cardiology and Congenital Cardiac Surgery Unit (India); Wadhawan, Manav [Indraprastha Apollo Hospital, Department of Gastroenterology and Hepatology (India); Gupta, Subhash [Indraprastha Apollo Hospital, Department of Liver Transplant (India); Roy, Vipul [Indraprastha Apollo Hospital, Department of Cardiology (India)

2010-02-15

204

Circumaortic Left Renal Vein-A Rare Case Report  

PubMed Central

During routine dissection which was carried out for the medical students, a circumaortic left renal vein draining into inferior vena cava was observed. There were 2 renal veins through which the left kidney drained into the inferior vena cava, of which the larger one ran ventral to aorta and the other smaller one ran posterior to aorta and received lumbar veins before opening into inferior vena cava. This is a relatively rare condition which can result in left renal hypertension (LRVH) syndrome which is otherwise called as anterior and posterior nutcracker syndromes. This venous anomaly results from the errors of embryological development. It is of clinical significance, mainly during retroperitoneal surgeries and intra caval interventions. It is also important in conditions which warrant extensive venous dissections, venous reconstructions as in transplantations and invasion of veins by cancerous tissue, resulting in life threatening haemorrhage. PMID:24783096

Panagar, Anupama Doddappaiah; Subhash, R. Lakshmi Prabha; Suresh, B.S.; Nagaraj, D.N.

2014-01-01

205

Circumaortic left renal vein-a rare case report.  

PubMed

During routine dissection which was carried out for the medical students, a circumaortic left renal vein draining into inferior vena cava was observed. There were 2 renal veins through which the left kidney drained into the inferior vena cava, of which the larger one ran ventral to aorta and the other smaller one ran posterior to aorta and received lumbar veins before opening into inferior vena cava. This is a relatively rare condition which can result in left renal hypertension (LRVH) syndrome which is otherwise called as anterior and posterior nutcracker syndromes. This venous anomaly results from the errors of embryological development. It is of clinical significance, mainly during retroperitoneal surgeries and intra caval interventions. It is also important in conditions which warrant extensive venous dissections, venous reconstructions as in transplantations and invasion of veins by cancerous tissue, resulting in life threatening haemorrhage. PMID:24783096

Panagar, Anupama Doddappaiah; Subhash, R Lakshmi Prabha; Suresh, B S; Nagaraj, D N

2014-03-01

206

Finger Vein Recognition Based on Local Directional Code  

PubMed Central

Finger vein patterns are considered as one of the most promising biometric authentication methods for its security and convenience. Most of the current available finger vein recognition methods utilize features from a segmented blood vessel network. As an improperly segmented network may degrade the recognition accuracy, binary pattern based methods are proposed, such as Local Binary Pattern (LBP), Local Derivative Pattern (LDP) and Local Line Binary Pattern (LLBP). However, the rich directional information hidden in the finger vein pattern has not been fully exploited by the existing local patterns. Inspired by the Webber Local Descriptor (WLD), this paper represents a new direction based local descriptor called Local Directional Code (LDC) and applies it to finger vein recognition. In LDC, the local gradient orientation information is coded as an octonary decimal number. Experimental results show that the proposed method using LDC achieves better performance than methods using LLBP. PMID:23202194

Meng, Xianjing; Yang, Gongping; Yin, Yilong; Xiao, Rongyang

2012-01-01

207

Congenital absence of portal vein presenting as hepatopulmonary syndrome.  

PubMed

A 9-year-old girl presented with cyanosis and decreased exercise tolerance. Chest X-ray, lung function and echocardiogram were normal. Contrasted echocardiogram showed intrapulmonary right to left shunt and computerized tomography of the thorax showed dilated pulmonary vasculature. There was no arteriovenous malformation. Computerized tomography of the abdomen revealed absence of the intrahepatic portion of the portal vein. The superior mesenteric and splenic veins joined as a common trunk, bypassed the liver and drained into the right atrium. We concluded that the patient had hepatopulmonary syndrome secondary to absence of the portal vein. This is the first report of hepatopulmonary syndrome in a female paediatric patient with a congenital absence of the portal vein. As all portal blood entered directly into systemic circulation, the condition was equivalent to congenital portosystemic shunt. Cases of congenital portosystemic shunt complicated by hepatopulmonary syndrome were also reviewed. PMID:15670231

Cheung, K M; Lee, C Y; Wong, C T; Chan, A K H

2005-01-01

208

Finger vein recognition based on local directional code.  

PubMed

Finger vein patterns are considered as one of the most promising biometric authentication methods for its security and convenience. Most of the current available finger vein recognition methods utilize features from a segmented blood vessel network. As an improperly segmented network may degrade the recognition accuracy, binary pattern based methods are proposed, such as Local Binary Pattern (LBP), Local Derivative Pattern (LDP) and Local Line Binary Pattern (LLBP). However, the rich directional information hidden in the finger vein pattern has not been fully exploited by the existing local patterns. Inspired by the Webber Local Descriptor (WLD), this paper represents a new direction based local descriptor called Local Directional Code (LDC) and applies it to finger vein recognition. In LDC, the local gradient orientation information is coded as an octonary decimal number. Experimental results show that the proposed method using LDC achieves better performance than methods using LLBP. PMID:23202194

Meng, Xianjing; Yang, Gongping; Yin, Yilong; Xiao, Rongyang

2012-01-01

209

varicose veins smoking obesity swine flu high blood pressure  

E-print Network

varicose veins smoking obesity swine flu high blood pressure parkinson's stress depression muscle stiffness heart attack asthma low blood pressure alzheimer's cancer diabetes kidney failure dementia smoking obesity swine flu high blood pressure parkinson's stress depression muscle stiffness heart attack

Diggle, Peter J.

210

Fossil evidence for Cretaceous escalation in angiosperm leaf vein evolution  

E-print Network

Fossil evidence for Cretaceous escalation in angiosperm leaf vein evolution Taylor S. Feilda,1 leaves of nonangiosperms and angiosperms forms the mechanistic foundation for speculation about how angiosperms drove sweeping ecological and biogeo- chemical change during the Cretaceous. However

Bermingham, Eldredge

211

Smoothelin and Intermediate Filament Proteins in Humanaortocoronary Saphenous Vein By-pass Grafts  

Microsoft Academic Search

The aim of this immunohistochemical investigation was to study the distribution of the novel cytoskeletal protein smoothelin and the intermediate filament proteins vimentin and desmin in normal human great saphenous vein and in human aortocoronary by-pass vein grafts. Smoothelin was present in most smooth muscle cells in the media of the native vein. In the neointima of the vein grafts

Bengt Johansson; Anders Eriksson; Frans Ramaekers; Lars-Eric Thornell

1999-01-01

212

Balloon-Occluded Retrograde Transvenous Obliteration of Gastric Varix Via the Pericardiacophrenic Vein  

SciTech Connect

We encountered a case of gastric varix without a gastrorenal shunt that drained through the left pericardiacophrenic vein, which entered the left brachiocephalic vein. For this case we successfully performed balloon-occluded retrograde transvenous obliteration, in which sclerotic agents were infused via the left pericardiacophrenic vein approached from the left subclavian vein.

Yoshimatsu, Rika, E-mail: rika442@koto.kpu-m.ac.jp; Yamagami, Takuji; Tanaka, Osamu; Miura, Hiroshi [Kyoto Prefectural University of Medicine, Department of Radiology, Graduate School of Medical Science (Japan); Okuda, Kotaro [Fukuchiyama City Hospital, Department of Internal Medicine (Japan); Nishimura, Tsunehiko [Kyoto Prefectural University of Medicine, Department of Radiology, Graduate School of Medical Science (Japan)

2011-02-15

213

Endoscopic Versus Open Saphenous Vein Harvest: A Comparison of Postoperative Wound Complications  

Microsoft Academic Search

Background. Wound complications associated with long incisions used to harvest the greater saphenous vein are well documented. Recent reports suggest that tech- niques of endoscopic vein harvest may result in de- creased wound complications. A prospective, nonran- domized study was developed to compare outcomes of open versus endoscopic vein harvest procedures. Methods. There were 106 patients in the open vein

Jerene M. Bitondo; Willard M. Daggett; David F. Torchiana; Cary W. Akins; Alan D. Hilgenberg; Gus J. Vlahakes; Joren C. Madsen; Thomas E. MacGillivray; Arvind K. Agnihotri

2010-01-01

214

Endoscopic versus open saphenous vein harvest: a comparison of postoperative wound complications  

Microsoft Academic Search

Background. Wound complications associated with long incisions used to harvest the greater saphenous vein are well documented. Recent reports suggest that techniques of endoscopic vein harvest may result in decreased wound complications. A prospective, nonrandomized study was developed to compare outcomes of open versus endoscopic vein harvest procedures.Methods. There were 106 patients in the open vein harvest group, and 154

Jerene M Bitondo; Willard M Daggett; David F Torchiana; Cary W Akins; Alan D Hilgenberg; Gus J Vlahakes; Joren C Madsen; Thomas E MacGillivray; Arvind K Agnihotri

2002-01-01

215

Liver transplantation complicated by misplaced TIPS in the portal vein.  

PubMed Central

OBJECTIVE: The purpose of this study was to determine the incidence and complications related to transjugular intrahepatic portosystemic shunt (TIPS) stents found in the portal vein at the time of an orthotopic liver transplantation. BACKGROUND: Transjugular intrahepatic portosystemic shunts are frequently used in patients with end-stage liver disease as a bridge to liver transplantation. The incidence of finding the metal stent outside of the liver parenchyma at the time of transplantation is reported as high as 30%. Most cases that have been detailed involve stents misplaced in the vena cava with various outcomes. Almost no data are available regarding stents misplaced into the portal vein. METHODS AND RESULTS: We report our experience with four patients with whom a TIPS stent was found misplaced in the portal vein at the time of liver transplantation, including one patient with a stent extending into the superior mesenteric vein. This patient required extensive venous reconstruction using a retropancreatic "pant" donor-iliac vein graft. The three other patients were transplanted without the need for extensive venous reconstruction. There was no significant difference in operative times for this group of patients, but there was a significant increase in the requirement for blood transfusion. In a follow-up period ranging from 6 months to 2 years, all patients remained alive and had normal portal venous flow and functioning allografts. Most misplaced stents were placed in patients with small cirrhotic livers and by radiologists with minimal experience with the procedure. CONCLUSIONS: Misplaced TIPS in the portal vein before liver transplantation is a more frequent complication than previously reported; however, it does not represent major technical difficulty if a clamp can be placed proximally on the portal vein. In the case of a stent extending below the spleno-mesenteric confluence, interposition grafts such as a donor-iliac vein graft are necessary for venous reconstruction. The experience of the radiologist is critical to prevent this complication. Images Figure 1. Figure 2. PMID:9527068

Clavien, P A; Selzner, M; Tuttle-Newhall, J E; Harland, R C; Suhocki, P

1998-01-01

216

Endovascular Treatment of a Portal Vein Tear During TIPSS  

SciTech Connect

During a transjugular portosystemic stent-shunt (TIPSS) procedure a portal vein laceration occurred with subsequent intraperitoneal hemorrhage. A PTFE-covered nitinol stent was successfully placed eliminating the leak and creating a functioning portosystemic shunt. This case demonstrates both the importance of portal vein puncture more than 1 cm from the bifurcation and the necessity of maintaining a stock of available stent-grafts.

Owen, Richard J.T.; Rose, John D.G. [Department of Clinical Radiology, Freeman Hospital, Newcastle upon Tyne, NE7 7DN (United Kingdom)

2000-03-15

217

Feature Level Fusion of Fingerprint and Finger Vein Biometrics  

Microsoft Academic Search

\\u000a The aim is to study the fusion at feature extraction level for fingerprint and finger vein biometrics. A novel dynamic weighting\\u000a matching algorithm based on quality evaluation of interest features is proposed. First, fingerprint and finger vein images\\u000a are preprocessed by filtering, enhancement, gray-scale normalization and etc. The effective feature point-sets are extracted\\u000a from two model sources. To handle the

Kunming Lin; Fengling Han; Yongming Yang; Zulong Zhang

218

Temporary transection of innominate vein in surgery of midtracheal tumor  

PubMed Central

In this case, a patient presented with a large primary midtracheal tumor posterior to the innominate vein and brachiocephalic artery. The left innominate vein (LIV) was temporarily transected to attain proper access to the tumor. After complete removal of the tumor, the vessel was reanastomosed. The operation was uneventful, and the patient recovered well. Temporary transection of the LIV appears to be a reasonable alternative to surgical resection in such a large cross-border midtracheal tumor. PMID:24605240

Ren, Fuqiang; Pu, Qiang

2014-01-01

219

Vein formation in the C1 carbonaceous chondrites  

NASA Technical Reports Server (NTRS)

Veins in the C1 chondrites Orgueil, Alais, and Ivuna have been deposited during an extended period of impact brecciation and leaching. At least three generations of mineralization, dominated successively by carbonates, calcium sulfate, and magnesium sulfate, can be recognized. Vein minerals are derived locally by closed-system reactions between matrix phyllosilicates and an aqueous fluid, with the result that few, if any, primitive mineral phases still exist in the C1s.

Richardson, S. M.

1978-01-01

220

Primary granulomatous giant cell polyphlebitis of visceral veins  

Microsoft Academic Search

A case of granulomatous giant cell phlebitis occurred in the mesenteric veins of a 38-year-old man, resulting in segmental infarction of the ileum. Multiple epitheloid granulomas with giant cells of the Langhans type were situated in media\\/adventitia of small and middle-sized mesenteric veins with subsequent thrombotic venous occlusions. No involvement of arterial vessels could be detected. The aetiology of the

Hans Jiirg Leu; Gabriele Brinninger; Christian Pernegger; Bernhard Odermatt

1993-01-01

221

Robust finger vein ROI localization based on flexible segmentation.  

PubMed

Finger veins have been proved to be an effective biometric for personal identification in the recent years. However, finger vein images are easily affected by influences such as image translation, orientation, scale, scattering, finger structure, complicated background, uneven illumination, and collection posture. All these factors may contribute to inaccurate region of interest (ROI) definition, and so degrade the performance of finger vein identification system. To improve this problem, in this paper, we propose a finger vein ROI localization method that has high effectiveness and robustness against the above factors. The proposed method consists of a set of steps to localize ROIs accurately, namely segmentation, orientation correction, and ROI detection. Accurate finger region segmentation and correct calculated orientation can support each other to produce higher accuracy in localizing ROIs. Extensive experiments have been performed on the finger vein image database, MMCBNU_6000, to verify the robustness of the proposed method. The proposed method shows the segmentation accuracy of 100%. Furthermore, the average processing time of the proposed method is 22 ms for an acquired image, which satisfies the criterion of a real-time finger vein identification system. PMID:24284769

Lu, Yu; Xie, Shan Juan; Yoon, Sook; Yang, Jucheng; Park, Dong Sun

2013-01-01

222

Methods for studying drug effects on superficial human veins.  

PubMed

Direct effects of vasoactive substances on superficial human veins in vivo can be investigated by measuring changes in the diameter of a superficial vein at a standardized congestion pressure which reflect changes in venous tone before and after local infusion of the drugs. The diameter of a superficial hand vein is measured with the aid of a linear variable differential transformer mounted directly on the back of the hand. The central core of the transformer positioned over the summit of the vein moves simultaneously with changes in venous diameter and allows continuous recording of these alterations. A series of ergot alkaloids were investigated with this technique and found to elicit a direct constrictor action when infused locally. Studies on the mode of action of the venoconstrictor effects of ergot alkaloids suggest that they are mediated by stimulation of alpha- and 5-HT-receptors. Similarly, guanfacine, a centrally-acting antihypertensive drug, reduces venous compliance after direct local administration as a result of alpha-adrenoceptor stimulation. The venodilator effect of isoprenaline can be shown in veins preconstricted with noradrenaline, whereas with nitroglycerine, venodilatation is observed by local infusions in veins not preconstricted. This method is therefore useful for studying the direct effects of venoconstrictor and venodilator drugs in man. The technique can also be used to study interactions between different agents and thus to investigate the mode of action of drugs. Drugs can be infused locally at doses which do not elicit systemic effects. PMID:3840550

Aellig, W H

1985-06-01

223

Robust Finger Vein ROI Localization Based on Flexible Segmentation  

PubMed Central

Finger veins have been proved to be an effective biometric for personal identification in the recent years. However, finger vein images are easily affected by influences such as image translation, orientation, scale, scattering, finger structure, complicated background, uneven illumination, and collection posture. All these factors may contribute to inaccurate region of interest (ROI) definition, and so degrade the performance of finger vein identification system. To improve this problem, in this paper, we propose a finger vein ROI localization method that has high effectiveness and robustness against the above factors. The proposed method consists of a set of steps to localize ROIs accurately, namely segmentation, orientation correction, and ROI detection. Accurate finger region segmentation and correct calculated orientation can support each other to produce higher accuracy in localizing ROIs. Extensive experiments have been performed on the finger vein image database, MMCBNU_6000, to verify the robustness of the proposed method. The proposed method shows the segmentation accuracy of 100%. Furthermore, the average processing time of the proposed method is 22 ms for an acquired image, which satisfies the criterion of a real-time finger vein identification system. PMID:24284769

Lu, Yu; Xie, Shan Juan; Yoon, Sook; Yang, Jucheng; Park, Dong Sun

2013-01-01

224

Anatomy and physiology of the lower-extremity deep and superficial veins.  

PubMed

A thorough understanding of venous anatomy and physiology is foundational to the diagnosis and management of venous disease. Compared with the arterial system, there is significantly greater developmental variation in the venous system. The veins of the lower extremity include the superficial and deep veins, which are defined by their respective relationships to the muscular fascia. Perforating veins traverse the muscular fascia to connect superficial and deep veins. Communicating veins connect veins within the same venous compartment, either deep to deep or superficial to superficial. The deep veins of the lower extremities primarily drain muscles and are encompassed by muscular fascia. The veins located between the skin and the muscular fascia are considered superficial veins. Superficial veins drain the cutaneous microcirculation. The pelvic venous system is a complex transitional outflow pathway between the lower extremities, the pelvic structures, and the inferior vena cava. The terminology used to describe lower-extremity, pelvic, and abdominal vasculature conforms to published international standards. PMID:24840960

Black, Carl M

2014-06-01

225

Stripping the long saphenous vein reduces the rate of reoperation for recurrent varicose veins: Five-year results of a randomized trial  

Microsoft Academic Search

Objective: The purpose of this study was to investigate the possible long-term clinical advantages of stripping the long saphenous vein during routine primary varicose vein surgery. Methods: The study was designed as a 5-year, clinical and duplex scan follow-up examination of a group of patients who were randomized to stripping of the long saphenous vein during varicose vein surgery versus

Simon Dwerryhouse; Birgit Davies; Kate Harradine; Jonathan J. Earnshaw

1999-01-01

226

Huebnerite veins near Round Mountain, Nye County, Nevada  

SciTech Connect

Small huebnerite-bearing quartz veins occur in and near Cretaceous (about 95 m.y. old) granite east and south of Round Mountain. The veins are short, lenticular, and strike mostly northeast and northwest in several narrow east-trending belts. The quartz veins were formed about 80 m.y. ago near the end of an episode of doming and metamorphism of the granite and emplacement of aplite and pegmatite dikes in and near the granite. An initial hydrothermal stage involved deposition of muscovite, quartz, huebnerite, fluorite, and barite in the veins. Veins were then sheared, broken, and recrystallized. A second hydrothermal stage, possibly associated with emplacement of a rhyolite dike swarm and granodiorite stock about 35 m.y. ago, saw deposition of more muscovite, quartz, fluorite, and barite, and addition of scheelite, tetrahedrite-tennantite, several sulfide minerals, and chalcedony. Finally, as a result of near-surface weathering, secondary sulfide and numerous oxide, tungstate, carbonate, sulfate, phosphate, and silicate minerals formed in the veins. Depth of burial at the time of formation of the veins, based on geologic reconstruction, was about 3-3.5 km. The initial hydrothermal stage ended with deposition of quartz at a temperature of about 210/sup 0/C and pressures of about 240 to 280 bars from fluids with salinity of about 5 wt % sodium chloride. Fluorite then was deposited at about 250/sup 0/ to 280/sup 0/C from solutions of similar salinity and containing a small amount of carbon dioxide. During shearing that followed initial mineralization, quartz was recrystallized at a temperature of 270/sup 0/ to 290/sup 0/C and in association with fluids of about 5 wt % sodium chloride equivalent and containing carbon dioxide. Late-stage fluorite was deposited from fluids with similar salinity but devoid of carbon dioxide at a temperature of about 210/sup 0/C. 76 refs., 38 figs., 8 tabs.

Shawe, D.R.; Foord, E.E.; Conklin, N.M.

1984-01-01

227

Structural and mechanical characterisation of bridging veins: A review.  

PubMed

Bridging veins drain the venous blood from the cerebral cortex into the superior sagittal sinus (SSS) and doing so they bridge the subdural space. Despite their importance in head impact biomechanics, little is known about their properties with respect to histology, morphology and mechanical behaviour. Knowledge of these characteristics is essential for creating a biofidelic finite element model to study the biomechanics of head impact, ultimately leading to the improved design of protective devices by setting up tolerance criteria. This paper presents a comprehensive review of the state-of-the-art knowledge on bridging veins. Tolerance criteria to prevent head injury through impact have been set by a number of research groups, either directly through impact experiments or by means of finite element (FE) simulations. Current state-of-the-art FE head models still lack a biofidelic representation of the bridging veins. To achieve this, a thorough insight into their nature and behaviour is required. Therefore, an overview of the general morphology and histology is provided here, showing the clearly heterogeneous nature of the bridging vein complex, with its three different layers and distinct morphological and histological changes at the region of outflow into the superior sagittal sinus. Apart from a complex morphology, bridging veins also exhibit complex mechanical behaviour, being nonlinear, viscoelastic and prone to damage. Existing material models capable of capturing these properties, as well as methods for experimental characterisation, are discussed. Future work required in bridging vein research is firstly to achieve consensus on aspects regarding morphology and histology, especially in the outflow cuff segment. Secondly, the advised material models need to be populated with realistic parameters through biaxial mechanical experiments adapted to the dimensions of the bridging vein samples. Finally, updating the existing finite element head models with these parameters will render them truly biofidelic, allowing the establishment of accurate tolerance criteria and, ultimately, better head protection devices. PMID:25052244

Famaey, Nele; Ying Cui, Zhao; Umuhire Musigazi, Grace; Ivens, Jan; Depreitere, Bart; Verbeken, Erik; Vander Sloten, Jos

2015-01-01

228

Fluid overpressure estimates from the aspect ratios of mineral veins  

NASA Astrophysics Data System (ADS)

Several hundred calcite veins and (mostly) normal faults were studied in limestone and shale layers of a Mesozoic sedimentary basin next to the village of Kilve at the Bristol Channel (SW-England). The veins strike mostly E-W (239 measurements), that is, parallel with the associated normal faults. The mean vein dip is 73°N (44 measurements). Field observations indicate that these faults transported the fluids up into the limestone layers. The vein outcrop (trace) length (0.025-10.3 m) and thickness (0.1-28 mm) size distributions are log-normal. Taking the thickness as the dependent variable and the outcrop length as the independent variable, linear regression gives a coefficient of determination (goodness of fit) of R2 = 0.74 (significant with 99% confidence), but natural logarithmic transformation of the thickness-length data increases the coefficient of determination to R2 = 0.98, indicating that nearly all the variation in thickness can be explained in terms of variation in trace length. The geometric mean of the aspect (length/thickness) ratio, 451, gives the best representation of the data set. With 95% confidence, the true geometric mean of the aspect ratios of the veins lies in the interval 409-497. Using elastic crack theory, appropriate elastic properties of the host rock, and the mean aspect ratio, the fluid overpressure (that is, the total fluid pressure minus the normal stress on the fracture plane) at the time of vein formation is estimated at around 18 MPa. From these results, and using the average host rock and water densities, the depth to the sources of the fluids (below the present exposures) forming the veins is estimated at between around 300 m and 1200 m. These results are in agreement to those obtained by independent isotopic studies and indicate that the fluids were of rather local origin, probably injected from sill-like sources (water sills) inside the sedimentary basin.

Philipp, Sonja L.

2012-12-01

229

Finger Vein Recognition Based on Personalized Weight Maps  

PubMed Central

Finger vein recognition is a promising biometric recognition technology, which verifies identities via the vein patterns in the fingers. Binary pattern based methods were thoroughly studied in order to cope with the difficulties of extracting the blood vessel network. However, current binary pattern based finger vein matching methods treat every bit of feature codes derived from different image of various individuals as equally important and assign the same weight value to them. In this paper, we propose a finger vein recognition method based on personalized weight maps (PWMs). The different bits have different weight values according to their stabilities in a certain number of training samples from an individual. Firstly we present the concept of PWM, and then propose the finger vein recognition framework, which mainly consists of preprocessing, feature extraction, and matching. Finally, we design extensive experiments to evaluate the effectiveness of our proposal. Experimental results show that PWM achieves not only better performance, but also high robustness and reliability. In addition, PWM can be used as a general framework for binary pattern based recognition. PMID:24025556

Yang, Gongping; Xiao, Rongyang; Yin, Yilong; Yang, Lu

2013-01-01

230

Flap pedicle vena comitant as a vein graft donor source.  

PubMed

A vena comitant segment harvested from a flap's pedicle can be used as an interpositional vein graft in selected microvascular cases. When a vascular pedicle includes paired venae comitantes, one of these can prove suitable for use as a vein graft while still allowing for venous outflow of the flap. An additional operative site and procedure to harvest a vein graft can be avoided if a vena comitant segment can be used. We present eight cases in which pedicle vena comitant segments were used as interpositional vein grafts. In six cases, vena comitant grafts were used to supercharge or augment venous outflow in transverse rectus abdominis myocutaneous (TRAM) flaps used for breast reconstruction. A vena comitant graft was used to revise the venous anastomosis in one deep inferior epigastric perforator (DIEP) flap. The arterial anastomosis was revised with a vena comitant graft in a gracilis muscle free flap. Our experience demonstrates the viability and utility of using the flap pedicle's vena comitant as a source of vein graft in selected cases. PMID:18946884

Stewart, Daniel; Liau, James; Vasconez, Henry

2009-01-01

231

CENTRAL RETINAL VEIN OCCLUSION IN A YOUNG CHINESE POPULATION  

PubMed Central

Purpose The purpose of this study was to assess the risk factors for central retinal vein occlusion and associated morbidity and mortality in a Chinese population. Methods The participants included patients with central retinal vein occlusion 40 years old and younger. Predisposing factors, mortality, and systemic complications were examined in this group. Results Unilateral (n = 19) and bilateral (n = 3) central retinal vein occlusions were identified in a total of 22 patients (25 eyes), with a mean follow-up time of 37 months. Hypercholesterolemia (65%), hypertriglyceridemia (64%), and hyperhomocysteinemia (42%) were all identified as risk factors. Three patients (14%) developed stroke and 1 (5%) developed transient ischemic attacks during follow-up. Renal failure and pulmonary hypertension resulted in the death of two patients. The mean initial and final visual acuities (±standard deviation) were 20/400 (±20/250) and 20/500 (±20/320), respectively, and treatments did not result in vision improvement (P = 0.57). The poor visual prognosis was likely due to macular edema in 7 eyes (28%), optic atrophy in 4 eyes (16%), and secondary glaucoma in 3 eyes (12%). Conclusion Morbidity and mortality are high in young Chinese patients with central retinal vein occlusion who may have associated serious complications including stroke, blindness, and death. Central retinal vein occlusion may serve as an initial clinical presentation of serious systemic diseases. PMID:20010454

Kuo, Jane Zea-Chin; Lai, Chi-Chun; Ong, Frank Shih-Chang; Shih, Chia-Pang; Yeung, Ling; Chen, Tun-Lu; Chen, Kuan-Jen; Wu, Wei-Chi

2010-01-01

232

Alteration and vein mineralization, Ladwig uranium mine, Jefferson County, Colorado  

USGS Publications Warehouse

Uranium ore at the Ladwig mine, Jefferson County, Colo., occurs in steeply dipping, northwest-striking faults and related fractures with a carbonate-adularia assemblage that forms in altered wallrocks and fills veins. The faults occur between large intrusive pegmatites and garnetiferous gneisses of Precambrian age, and were reactivated as the result of the early Paleocene uplift of the Front Range foothills. Mineralization in the deposit includes both wallrock alteration and vein filling. Alteration was intense but local, and chiefly involved the carbonatization of mafic minerals in the wallrocks. Felsic minerals in the wallrocks are relatively unaltered. The veins are filled with an adularia-pitchblende-carbonate assemblage with minor related sulfides and coffinite. Many of the iron-bearing carbonates in both the alteration and vein assemblages have been altered to hematite. The mineralization and alteration are believed to have formed in response to initially high amounts of CO2 and the subsequent release of dissolved CO2 by boiling or effervescence. Uranium, carried in a dicarbonate complex, was precipitated directly as pitchblende when the CO2 was released. The expulsion of H+ during boiling created a net oxidizing environment which oxidized the iron-bearing carbonates. Late stage calcite and sulfides were deposited in existing voids in the veins.

Wallace, Alan R.

1979-01-01

233

Stibnite vein from D?bowina near Bardo (polish Sudetes)  

NASA Astrophysics Data System (ADS)

In the contact zone of the Bardo Structure and K?odzko-Z?oty Stok Intrusion and K?odzko Metamorphic, metasomatic orebearing quartz-carbonate veins rich in Sb, Zn, Cu, Ag, Au, Pb are present. In 1771 the mine ,,Reiche Silber Gluck” within stibnite vein was founded in D?bowina near Bardo. Its entrance was discovered again in 2007. The stibnite vein is mainly build of stibnite and sphalerite and of quartz and dolomite rich in Mn. Stibnite crystallizes as columnar or forming radiate centres and aciculars. Its crystals reach size to 2 mm. Sphalerite appears as individual anhedral and polymineralic grained concentrations reaching size to 2,5 mm. Earlier pyrite and arsenopyrite crystallized - they occur locally in this deposit. There were found also in the deposit tetrahedrite rich in Ag, what wasn't reported earlier in studies from the mine in D?bowina.

Kotula, Piotr

2013-09-01

234

Superficial vein thrombosis: a current approach to management.  

PubMed

Superficial vein thrombosis (SVT) was considered to be a benign and self-limiting condition. However, it is now appreciated that a significant proportion of those presenting with SVT will have concomitant deep vein thrombosis or pulmonary embolism, or are at significant risk of developing deep venous thromboembolism. Potential therapeutic options include topical preparations, compression therapy (stockings, bandages), medication such as non-steroidal anti-inflammatory drugs (NSAIDs) or anticoagulants (therapeutic or prophylactic doses) and surgery, ligation or stripping, of superficial veins. The treatment of choice is therapeutic/intermediate dose low molecular weight heparin or prophylactic dose fondaparinux administered for 4-6 weeks. The cost-effectiveness of treatment is a concern and more targeted therapy is required. PMID:25521017

Scott, Gemma; Mahdi, Ali Jassem; Alikhan, Raza

2015-03-01

235

Finger Vein Recognition Based on a Personalized Best Bit Map  

PubMed Central

Finger vein patterns have recently been recognized as an effective biometric identifier. In this paper, we propose a finger vein recognition method based on a personalized best bit map (PBBM). Our method is rooted in a local binary pattern based method and then inclined to use the best bits only for matching. We first present the concept of PBBM and the generating algorithm. Then we propose the finger vein recognition framework, which consists of preprocessing, feature extraction, and matching. Finally, we design extensive experiments to evaluate the effectiveness of our proposal. Experimental results show that PBBM achieves not only better performance, but also high robustness and reliability. In addition, PBBM can be used as a general framework for binary pattern based recognition. PMID:22438735

Yang, Gongping; Xi, Xiaoming; Yin, Yilong

2012-01-01

236

Fibular nerve injury after small saphenous vein surgery.  

PubMed

Superficial nerve injuries are very common during varicose vein surgery. In contrast, deep nerve injuries are rare and reported especially when surgery involves the small saphenous vein (SSV). The deep motor nerves most commonly injured are the tibial nerve and the peroneal nerve, which are directly or indirectly affected by extrinsic compression, stretching, or healing process involvement. In this report, two cases of common fibular nerve injury after SSV stripping are described, including treatment used and patient outcomes. Nerve damage mechanisms, anatomy, and prevention strategies are also discussed. In conclusion, fibular nerve damage may occur during SSV stripping. Preventive measures include careful preoperative ultrasonographic investigation of the anatomy of the vein, determining location of the saphenopopliteal joint, and careful dissection far from fibular nerve and restricted to the popliteal fossa. PMID:22664286

de Alvarenga Yoshida, Ricardo; Yoshida, Winston Bonetti; Sardenberg, Trajano; Sobreira, Marcone Lima; Rollo, Hamilton Almeida; Moura, Regina

2012-07-01

237

Portal Vein Stenting to Treat Portal Vein Stenosis in a Patient With Malignant Tumor and Gastrointestinal Bleeding  

PubMed Central

This report describes the successful use of portal venous stent placement for a patient with recurrent melena secondary to jejunal varices that developed after subtotal stomach preserved pancreatoduodenectomy (SSPPD). A 67-year-old man was admitted to our hospital with tarry stool and severe anemia at 2 years after SSPPD for carcinoma of the head of the pancreas. Abdominal computed tomography examination showed severe stenosis of the extrahepatic portal vein caused by local recurrence and showed an intensely enhanced jejunal wall at the choledochojejunostomy. Gastrointestinal bleeding scintigraphy also revealed active bleeding near the choledochojejunostomy. Based on these findings, jejunal varices resulting from portal vein stenosis were suspected as the cause of the melena. Portal vein stenting and balloon dilation was performed via the ileocecal vein after laparotomy. Coiling of the jejunal varices and sclerotherapy of the dilate postgastric vein with 5% ethanolamine oleate with iopamidol was performed. After portal stent placement, the patient was able to lead a normal life without gastrointestinal hemorrhage. However, he died 7 months later due to liver metastasis. PMID:24444277

Sakurai, Katsunobu; Amano, Ryosuke; Yamamoto, Akira; Nishida, Norifumi; Matsutani, Shinya; Hirata, Keiichiro; Kimura, Kenjiro; Muguruma, Kazuya; Toyokawa, Takahiro; Kubo, Naoshi; Tanaka, Hiroaki; Yashiro, Masakazu; Ohira, Masaichi; Hirakawa, Kosei

2014-01-01

238

Retrograde mechanochemical ablation of the small saphenous vein for the treatment of a venous ulcer.  

PubMed

We present the first case of retrograde ablation of the small saphenous vein to treat active venous ulceration. A 73-year-old gentleman with complicated varicose veins of the left leg and a non-healing venous ulcer despite previous successful endovenous treatment to his left great saphenous vein underwent mechanochemical ablation of his small saphenous vein with the ClariVein® system, under local anaesthetic, using a retrograde cannulation technique. Post-operatively the patient had improved symptomatically and the ulcer size had reduced. This report highlights that patients with small saphenous vein incompetence and active ulceration can be treated successfully with retrograde mechanochemical ablation. PMID:24347131

Moore, Hayley M; Lane, Tristan Ra; Franklin, Ian J; Davies, Alun H

2014-10-01

239

Absent portal vein bifurcation: a rare variant and its clinical significance  

PubMed Central

Portal vein branching anomaly occurs due to aberration of normal anastomotic patterns and involution of vitelline veins during development of portal vein. Anatomical knowledge of portal vein and its branching pattern is important for hepatobiliary surgeon and gastrointestinal intervention radiologist. We are reporting a case of absence of portal vein bifurcation showing single main intrahepatic portal vein with gradual decreasing caliber distally, in a young female patient on contrast-enhanced computed tomography study of abdomen. Few cases of absence of portal bifurcation have been reported in literature so far. PMID:25276482

Kumar Panda, Sitansu; Bahinipati, Pravakar

2014-01-01

240

Rational Classification of Portal Vein Thrombosis and Its Clinical Significance  

PubMed Central

Portal vein thrombosis (PVT) is commonly classified into acute (symptom duration <60 days and absence of portal carvernoma and portal hypertension) and chronic types. However, the rationality of this classification has received little attention. In this study, 60 patients (40 men and 20 women) with PVT were examined using contrast-enhanced computed tomography (CT). The percentage of vein occlusion, including portal vein (PV) and superior mesenteric vein (SMV), was measured on CT image. Of 60 patients, 17 (28.3%) met the criterion of acute PVT. Symptoms occurred more frequently in patients with superior mesenteric vein thrombosis (SMVT) compared to those without SMVT (p<0.001). However, there was no significant difference in PV occlusion between patients with and without symptoms. The frequency of cavernous transformation was significantly higher in patients with complete PVT than those with partial PVT (p<0.001). Complications of portal hypertension were significantly associated with cirrhosis (p<0.001) rather than with the severity of PVT and presence of cavernoma. These results suggest that the severity of PVT is only associated with the formation of portal cavernoma but unrelated to the onset of symptoms and the development of portal hypertension. We classified PVT into complete and partial types, and each was subclassified into with and without portal cavernoma. In conclusion, neither symptom duration nor cavernous transformation can clearly distinguish between acute and chronic PVT. The new classification system can determine the pathological alterations of PVT, patency of portal vein and outcome of treatment in a longitudinal study. PMID:25393320

Ma, Jingqin; Yan, Zhiping; Luo, Jianjun; Liu, Qingxin; Wang, Jianhua; Qiu, Shijing

2014-01-01

241

Palm-Vein Classification Based on Principal Orientation Features  

PubMed Central

Personal recognition using palm–vein patterns has emerged as a promising alternative for human recognition because of its uniqueness, stability, live body identification, flexibility, and difficulty to cheat. With the expanding application of palm–vein pattern recognition, the corresponding growth of the database has resulted in a long response time. To shorten the response time of identification, this paper proposes a simple and useful classification for palm–vein identification based on principal direction features. In the registration process, the Gaussian-Radon transform is adopted to extract the orientation matrix and then compute the principal direction of a palm–vein image based on the orientation matrix. The database can be classified into six bins based on the value of the principal direction. In the identification process, the principal direction of the test sample is first extracted to ascertain the corresponding bin. One-by-one matching with the training samples is then performed in the bin. To improve recognition efficiency while maintaining better recognition accuracy, two neighborhood bins of the corresponding bin are continuously searched to identify the input palm–vein image. Evaluation experiments are conducted on three different databases, namely, PolyU, CASIA, and the database of this study. Experimental results show that the searching range of one test sample in PolyU, CASIA and our database by the proposed method for palm–vein identification can be reduced to 14.29%, 14.50%, and 14.28%, with retrieval accuracy of 96.67%, 96.00%, and 97.71%, respectively. With 10,000 training samples in the database, the execution time of the identification process by the traditional method is 18.56 s, while that by the proposed approach is 3.16 s. The experimental results confirm that the proposed approach is more efficient than the traditional method, especially for a large database. PMID:25383715

Zhou, Yujia; Liu, Yaqin; Feng, Qianjin; Yang, Feng; Huang, Jing; Nie, Yixiao

2014-01-01

242

Palm-vein classification based on principal orientation features.  

PubMed

Personal recognition using palm-vein patterns has emerged as a promising alternative for human recognition because of its uniqueness, stability, live body identification, flexibility, and difficulty to cheat. With the expanding application of palm-vein pattern recognition, the corresponding growth of the database has resulted in a long response time. To shorten the response time of identification, this paper proposes a simple and useful classification for palm-vein identification based on principal direction features. In the registration process, the Gaussian-Radon transform is adopted to extract the orientation matrix and then compute the principal direction of a palm-vein image based on the orientation matrix. The database can be classified into six bins based on the value of the principal direction. In the identification process, the principal direction of the test sample is first extracted to ascertain the corresponding bin. One-by-one matching with the training samples is then performed in the bin. To improve recognition efficiency while maintaining better recognition accuracy, two neighborhood bins of the corresponding bin are continuously searched to identify the input palm-vein image. Evaluation experiments are conducted on three different databases, namely, PolyU, CASIA, and the database of this study. Experimental results show that the searching range of one test sample in PolyU, CASIA and our database by the proposed method for palm-vein identification can be reduced to 14.29%, 14.50%, and 14.28%, with retrieval accuracy of 96.67%, 96.00%, and 97.71%, respectively. With 10,000 training samples in the database, the execution time of the identification process by the traditional method is 18.56 s, while that by the proposed approach is 3.16 s. The experimental results confirm that the proposed approach is more efficient than the traditional method, especially for a large database. PMID:25383715

Zhou, Yujia; Liu, Yaqin; Feng, Qianjin; Yang, Feng; Huang, Jing; Nie, Yixiao

2014-01-01

243

Incomplete recanalization as an important determinant of Thrombolysis in Myocardial Infarction (TIMI) grade 2 flow after thrombolytic therapy for acute myocardial infarction. TEAM Investigators. Thrombolytic Trial of Eminase in Acute Myocardial Infarction.  

PubMed

The outcome of patients with Thrombolysis in Myocardial Infarction (TIMI) trial grade 2 flow is worse than that of patients with TIMI grade 3 flow after thrombolytic therapy for acute myocardial infarction. It is unclear whether TIMI grade 2 flow represents incomplete recanalization of the culprit lesion or poor distal runoff. The Thrombolytic Trial of Eminase (anistreplase) in Acute Myocardial Infarction (TEAM)-2 and TEAM-3 were randomized trials comparing anistreplase with streptokinase (TEAM-2, n = 370) or with alteplase (tissue plasminogen activator) (TEAM-3, n = 325). We compared the minimal luminal diameter of the culprit lesion in patients with TIMI grade 2 flow with that in patients with TIMI grade 3 flow both 90 minutes (TEAM-2) and 1 day (TEAM-3) after thrombolysis. Patients with TIMI grade 2 flow had a lower residual luminal diameter in the culprit lesion than patients with TIMI grade 3 flow (TEAM-2, 0.58 +/- 0.03 vs 0.79 +/- 0.02 mm, p = 0.0001; TEAM-3, 0.88 +/- 0.04 vs 1.17 +/- 0.03 mm, p = 0.0001, for patients with TIMI grades 2 and 3 flow). Residual percent stenosis was correspondingly higher in patients with TIMI grade 2 flow. At the early angiogram, 66% of patients with TIMI grade 2 flow, but only 35% of those with TIMI grade 3 flow, had a minimal luminal diameter of 0.6 mm (positive predictive value 87%, negative predictive value 35%). Incomplete recanalization of the culprit lesion may thus be an important determinant of TIMI grade 2 flow after thrombolysis. Whether more complete thrombolysis or rescue angioplasty improves outcome in these patients deserves evaluation. PMID:7572648

Zahger, D; Karagounis, L A; Cercek, B; Anderson, J L; Sorensen, S; Moreno, F; Shah, P K

1995-10-15

244

3D Multispectral Light Propagation Model For Subcutaneous Veins Imaging  

SciTech Connect

In this paper, we describe a new 3D light propagation model aimed at understanding the effects of various physiological properties on subcutaneous vein imaging. In particular, we build upon the well known MCML (Monte Carlo Multi Layer) code and present a tissue model that improves upon the current state-of-the-art by: incorporating physiological variation, such as melanin concentration, fat content, and layer thickness; including veins of varying depth and diameter; using curved surfaces from real arm shapes; and modeling the vessel wall interface. We describe our model, present results from the Monte Carlo modeling, and compare these results with those obtained with other Monte Carlo methods.

Paquit, Vincent C [ORNL; Price, Jeffery R [ORNL; Meriaudeau, Fabrice [ORNL; Tobin Jr, Kenneth William [ORNL

2008-01-01

245

Finger Vein Recognition Using Local Line Binary Pattern  

PubMed Central

In this paper, a personal verification method using finger vein is presented. Finger vein can be considered more secured compared to other hands based biometric traits such as fingerprint and palm print because the features are inside the human body. In the proposed method, a new texture descriptor called local line binary pattern (LLBP) is utilized as feature extraction technique. The neighbourhood shape in LLBP is a straight line, unlike in local binary pattern (LBP) which is a square shape. Experimental results show that the proposed method using LLBP has better performance than the previous methods using LBP and local derivative pattern (LDP). PMID:22247670

Rosdi, Bakhtiar Affendi; Shing, Chai Wuh; Suandi, Shahrel Azmin

2011-01-01

246

[Ultrasound examination for lower extremity deep vein thrombosis].  

PubMed

Surgery is known to be a major risk factor of vein thrombosis. Progression from lower extremity deep vein thrombosis (DVT) to pulmonary embolism can lead to catastrophic outcome, although the incidence ratio is low. The ability to rule in or rule out DVT is becoming essential for anesthesiologists. Non-invasive technique of ultrasonography is a sensitive and specific tool for the assessment of lower extremity DVT. This article introduces the basics and practical methods of ultrasound examination for lower extremity DVT. PMID:25255659

Toyota, Kosaku

2014-09-01

247

Posttraumatic superior ophthalmic vein thrombosis in a 2 years old.  

PubMed

Superior ophthalmic vein thrombosis (SOVT) usually results from inflammatory, infectious, or malignant causes. This case describes a 2-year-old boy with severe prolapsing chemosis and proptosis due to thrombosis of the right superior ophthalmic vein resulting from midfacial and right orbital fractures 1 week after the initial trauma. Magnetic resonance imaging and internal carotid artery angiogram are essential in the diagnosis of SOVT. The literature on issues surrounding this case was reviewed with emphasis on the diagnostic evaluation, differential diagnoses, and management of posttraumatic SOVT. PMID:24488160

Akingbola, Olugbenga A; Shar, Basil; Singh, Dinesh; Frieberg, Edwin; Petrescu, Matei

2014-02-01

248

Interictal regional delta slowing in cerebral sinus vein thrombosis.  

PubMed

The electroencephalographic finding of regional delta activity should alert to the possibility of an underlying structural abnormality of the brain as a cause. A 5-year-old boy, who presented with severe headache and focal seizures, had normal neurological examination and brain CT findings. The initial electroencephalograph showed focal delta activity. An emergent brain MRI disclosed a thrombosis of the left sigmoid sinus and jugular vein, but no parenchymal lesions. The regional delta activity can presumably serve as a marker for brain tissue damage in cerebral sinus vein thrombosis, and sometimes, even to add information to that gained from imaging studies. PMID:25692516

Aharoni, Sharon; Goldberg-Stern, Hadassa; Kornreich, Liora; Shuper, Avinoam

2015-02-01

249

Clinical pharmacology, physiology and pathophysiology of superficial veins--1.  

PubMed

1. Venous resistance contributes very little to total peripheral resistance; more than half of the total blood volume, however, is contained in the extrathoracic veins. Owing to marked differences between venous and arterial anatomy and physiology, studies on veins and arteries usually require different methodological approaches. Whereas for arteries the most relevant parameters are resistance, pressure and flow, for veins volume and compliance are most important. For studies of general aspects of the peripheral circulatory system, venous occlusion plethysmography is probably the most useful method. The determination of both the rate of rise in limb volume and the total volume rise after inflating a proximally applied occlusion cuff to a subdiastolic pressure permits the concomitant estimation of both arterial flow and venous compliance. 2. Studies of direct pharmacological or physiological effects on veins, interactions of various pharmacological or physiological stimuli, or pathophysiological changes in venous responsiveness have been facilitated by the development of investigational techniques relying on direct measurements of the compliance of single human veins in vivo. One of these, relying on the use of a linear variable differential transformer (LVDT) for determining changes in the compliance of superficial veins at a standardized congestion pressure, has been found very suitable for the practical application in both patients and healthy subjects. 3. Physiological studies were carried out on the effect of age, exercise, temperature, and the menstrual cycle on venous compliance and venous responsiveness to various stimuli. In addition, interindividual variability in venous responsiveness in monozygotic and dizygotic twins and in unrelated subjects was investigated, and studies on the function of the endothelium were carried out in man in vivo. 4. Pathophysiological studies using this technique were reported from patients with hypertension, orthostatic hypotension, myocardial infarction, varicosis, cystic fibrosis, asthma, diabetes, systemic sclerosis, and cluster headache. 5. Clinical pharmacological studies represent a most important field for the use of this method. Studies were carried out on the effects of a large number of constrictor and dilator agents, and also on drug interactions on human veins in vivo. Venoconstriction was observed after local administration of alpha-adrenoceptor and 5-HT-receptor agonists, ergot derivatives, angiotensinogen, angiotensin I and II, and several prostaglandins. 6. Owing to the low venous tone present under effects can usually be quantified only on veins e.g. noradrenaline or 5-hydroxytryptamine. Under these conditions dilatation was observed after the administration of beta-adrenoceptor agonists, cholinergic (muscarinic) agonists, nitrates, calcium antagonists, bradykinin, substance P and several prostaglandins. PMID:7826819

Aellig, W H

1994-09-01

250

The Distant Morphological and Petrological Features of Shock Melt Veins in the Suizhou L6 Condrite  

SciTech Connect

The morphology and petrology of distinct melt veins in the Suizhou L6 chondrite have been investigated using scanning electron microscopy, electron microprobe analyses, and Raman spectroscopy, synchrotron energy-dispersive diffraction, and transmission electron microscopy. It is found that the melt veins in the Suizhou meteorite morphologically are the simplest, straightest, and thinnest among all shock veins known from meteorites. At first glance, these veins look like fine fractures, but petrologically they are solid melt veins of chondritic composition and consist of fully crystalline materials of two distinct lithological assemblages, with no glassy material remaining. The Suizhou melt veins contain the most abundant high-pressure mineral species when compared with all other veins known in chondrites. Thus, these veins in Suizhou are classified as shock veins. All rock-forming and almost all accessory minerals in the Suizhou shock veins have been transformed to their high-pressure polymorphs, and no fragments of the precursor minerals remain in the veins. Among the 11 high-pressure mineral phases identified in the Suizhou veins, three are new high-pressure minerals, namely, tuite after whitlockite, xieite, and the CF phase after chromite. On the basis of transformation of plagioclase into maskelynite, it is estimated that the Suizhou meteorite experienced shock pressures and shock temperatures up to 22 GPa and 1000 C, respectively. Shearing and friction along shock veins raised the temperature up to 1900-2000 C and the pressure up to 24 GPa within the veins. Hence, phase transition and crystallization of high-pressure minerals took place only in the Suizhou shock veins. Fast cooling of the extremely thin shock veins is regarded as the main reason that up to 11 shock-induced high-pressure mineral phases could be preserved in these veins.

X Xie; Z Sun; M Chen

2011-12-31

251

Splenic rupture following splenic vein thrombosis in a man with protein S deficiency.  

PubMed Central

We present a case of spontaneous splenic rupture in a man with splenic vein thrombosis. The splenic vein thrombosis appears to have been caused by protein S deficiency. We are not aware of this having been described before. PMID:1494517

Williams, N.; Gerrand, C.; London, N. J.; Chapman, C.; Bell, P. R.

1992-01-01

252

Identification and Partial Characterisation of Lettuce big-vein associated virus and Mirafiori lettuce big-vein virus in Common Weeds Found Amongst Spanish Lettuce Crops and their Role in Lettuce Big-vein Disease Transmission  

Microsoft Academic Search

The potential role of 10 frequently occurring weed species found amongst Spanish lettuce crops as host plants for the two\\u000a viruses associated with the lettuce big-vein disease, Lettuce big-vein associated virus (LBVaV) and Mirafiori lettuce big-vein virus (MLBVV), was studied. The results showed that both viruses can infect naturally growing Sonchus oleraceus (common sowthistle) plants, the unique susceptible species detected

Jose A. Navarro; Francisco Botella; Antonio Marhuenda; Pedro Sastre; M. Amelia Sánchez-Pina; Vicente Pallas

2005-01-01

253

Characteristics of whitefly transmission of Squash vein yellowing virus  

Technology Transfer Automated Retrieval System (TEKTRAN)

Squash vein yellowing virus (SqVYV), a recently described ipomovirus, is transmitted by the whitefly, Bemisia tabaci Gennadius, B strain. Understanding the characteristics of transmission is essential for developing management strategies for this virus, which is the causal agent for watermelon vine ...

254

The epidemiology of varicose veins. A survey in western Jerusalem  

Microsoft Academic Search

The prevalence and correlates of varicose veins were investigated in a community survey in a neighbourhood of western Jerusalem in 1969-71. The prevalence was 10% among men and 29% among women aged 15 and over; it rose with age in each sex. In both sexes, significant associations were found with standing at work and with region of birth. Among women,

J H Abramson; C Hopp; L M Epstein

1981-01-01

255

Arteries masquerading as varicose veins: A trap for phlebologists.  

PubMed

Ultrasound guided sclerotherapy may be complicated by intra-arterial injections resulting in significant tissue necrosis. Here, we present a 69-year-old man with a history of right small saphenous vein "stripping", presenting for the treatment of symptomatic lower limb varicose veins. Duplex ultrasound of the right lower limb outlined the pathway of venous incompetence. Despite the history of "stripping", the small saphenous vein was present but the sapheno-popliteal junction was ligated at the level of the knee crease. No other unusual findings were reported at the time. During ultrasound guided sclerotherapy, subcutaneous vessels of the right posterior calf were noted to be pulsatile on B-mode ultrasound. Treatment was interrupted. Subsequent angiography and sonography showed absence of the right distal popliteal artery. A cluster of subcutaneous vessels of the right medial and posterior calf were found to be arterial collaterals masquerading as varicose veins. Injection sclerotherapy of these vessels would have resulted in significant tissue loss. This case highlights the importance of vigilance at the time of treatment and the invaluable role of ultrasound in guiding endovenous interventions. PMID:25062681

Jones, L; Parsi, K

2014-07-25

256

Isolation and culture of umbilical vein mesenchymal stem cells  

Microsoft Academic Search

Bone marrow contains a population of stem cells that can support hematopoiesis and can differentiate into different cell lines including adipocytes, osteocytes, chondrocytes, myocytes, astrocytes, and tenocytes. These cells have been denoted mesenchymal stem cells. In the present study we isolated a cell population derived from the endothelium and subendothelium of the umbilical cord vein which possesses morphological, immunophenotypical and

D. T. Covas; J. L. C. Siufi; A. R. L. Silva; M. D. Orellana

2003-01-01

257

Ileocolic Arteriovenous Fistula with Superior Mesenteric Vein Aneurism: Endovascular Treatment  

SciTech Connect

We report a case of a venous aneurysm secondary to an acquired ileocolic arteriovenous fistula in a 64-year-old woman with recurrent abdominal pain and history of appendectomy. The aneurysm was diagnosed by ultrasound and computed tomography. Angiography showed an arteriovenous fistula between ileocolic branches of the superior mesenteric artery and vein. This vascular abnormality was successfully treated with coil embolization.

Gregorio, Miguel Angel de; Gimeno, Maria Jose; Medrano, Joaquin [Interventional Radiology, Clinico Universitario Lozano Blesa (Spain); Schoenholz, Caudio; Rodriguez, Juan; D'Agostino, Horacio [Interventional Radiology, State University Health Sciences Center (United States)

2004-09-15

258

Portal Vein Thrombosis and High Factor VIII in Turner Syndrome  

Microsoft Academic Search

Backgrounds\\/Aims: Turner syndrome is not usually associated with thrombotic events. The aim of this study is to report 3 Turner syndrome patients with portal vein thrombosis and, in 2 of them, high factor VIII. These findings are compared to values in Turner syndrome patients without thrombosis and controls. Methods: In different years, 3 patients with Turner syndrome were initially seen

Cristiane Kopacek Zilz; Juliana Keller Brenner; Regina Helena Elnecave

2006-01-01

259

Drosophila Smad2 Opposes Mad Signaling during Wing Vein Development  

E-print Network

Drosophila Smad2 Opposes Mad Signaling during Wing Vein Development Veronika Sander, Edward Eivers In the vertebrates, the BMP/Smad1 and TGF-b/Smad2 signaling pathways execute antagonistic functions in different Smad1 and high Smad2 signaling. In Drosophila, Mad regulates tissue determination and growth

De Robertis, Eddy M.

260

Saphenous Vein Sparing Superficial Inguinal Dissection in Lower Extremity Melanoma  

PubMed Central

Aim. The classic inguinal lymph node dissection is the main step for the regional control of the lower extremity melanoma, but this surgical procedure is associated with significant postoperative morbidity. The permanent lymphedema is the most devastating long-term complication leading to a significant decrease in the patient's quality of life. In this study we present our experience with modified, saphenous vein sparing, inguinal lymph node dissections for patients with melanoma of the lower extremity. Methods. Twenty one patients (10 women, 11 men) who underwent saphenous vein sparing superficial inguinal lymph node dissection for the melanoma of lower extremity were included in this study. The effects of saphenous vein sparing on postoperative complications were evaluated. Results. We have observed the decreased rate of long-term lymphedema in patients undergoing inguinal lymphadenectomy for the lower extremity melanoma. Conclusion. The inguinal lymphadenectomy with saphenous vein preservation in lower extremity melanoma patients seems to be an oncologically safe procedure and it may offer reduced long-term morbidity. PMID:25126426

Öztürk, Muhammed Be?ir; Akan, Arzu; Özkaya, Özay; Egemen, Onur; Örero?lu, Ali R?za; Akan, Mithat

2014-01-01

261

Testicular vein ligation and fertility in men with varicoceles  

Microsoft Academic Search

Pregnancy rates in 651 subfertile couples in which the man had a varicocele were analysed by life table methods and were not found to be significantly different before and after testicular vein ligation performed in 283 patients. Estimated proportions of couples conceiving were roughly 30% by one year and 45% by two years in both groups. The operation was also

H W Baker; H G Burger; D M de Kretser; B Hudson; G C Rennie; W G Straffon

1985-01-01

262

Squash vein yellowing virus and its effects on watermelon  

Technology Transfer Automated Retrieval System (TEKTRAN)

Squash vein yellowing virus (SqVYV), a novel whitefly-transmitted member of the Potyviridae was recently shown to cause a watermelon vine decline in Florida. Watermelon plants were grown under whitefly-free conditions in a greenhouse and inoculated with buffer (mock), SqVYV, or SqVYV and Papaya rin...

263

How I treat isolated distal deep vein thrombosis (IDDVT).  

PubMed

Thromboses limited to infrapopliteal leg deep veins (isolated distal deep vein thrombosis [IDDVT]) are frequently diagnosed in subjects with suspected pulmonary embolism or DVT and account for one-fourth to one-half of all diagnosed leg DVTs. Despite their frequency, the natural history of IDDVTs and their real risk of thromboembolic complications are still uncertain because of the scarcity of prospective, blind, nonintervention studies. Therefore it is still debated whether they warrant diagnosis and treatment. Diagnosis is based on ultrasonographic examination, which is more operator dependent and less sensitive in distal than in proximal veins. The available data seem to support the view that most IDDVTs are self-limiting and inconsequential for patients, though in some cases they can be associated with complications and warrant diagnosis and treatment. The available guidelines for treatment of IDDVTs give different indications ranging from serial imaging of the deep veins for 2 weeks to detect and treat only in case of proximal extension, to giving oral anticoagulation in all IDDVT patients for 3 months. I review this issue, focusing on possible and suggested treatments in symptomatic IDDVT patients, and describe our current therapeutic approach to these patients. PMID:24472834

Palareti, Gualtiero

2014-03-20

264

Pulmonary veins: Preferred site for catheter ablation of atrial fibrillation  

Microsoft Academic Search

Atrial fibrillation (AF) is one of the most challenging arrhythmias to treat. Many patients have to accept this disorder and the medications required. Nonpharmacologic therapies have emerged as alternative methods of treatment. However, technical difficulty, low success rate, high recurrence, and complications still are obstacles. Pulmonary veins as the most common trigger foci of paroxysmal AF are now the most

Aree Kantachuvessiri

2002-01-01

265

Mathematical Modeling of Radiofrequency Ablation for Varicose Veins  

PubMed Central

We present a three-dimensional mathematical model for the study of radiofrequency ablation (RFA) with blood flow for varicose vein. The model designed to analyze temperature distribution heated by radiofrequency energy and cooled by blood flow includes a cylindrically symmetric blood vessel with a homogeneous vein wall. The simulated blood velocity conditions are U = 0, 1, 2.5, 5, 10, 20, and 40?mm/s. The lower the blood velocity, the higher the temperature in the vein wall and the greater the tissue damage. The region that is influenced by temperature in the case of the stagnant flow occupies approximately 28.5% of the whole geometry, while the region that is influenced by temperature in the case of continuously moving electrode against the flow direction is about 50%. The generated RF energy induces a temperature rise of the blood in the lumen and leads to an occlusion of the blood vessel. The result of the study demonstrated that higher blood velocity led to smaller thermal region and lower ablation efficiency. Since the peak temperature along the venous wall depends on the blood velocity and pullback velocity, the temperature distribution in the model influences ablation efficiency. The vein wall absorbs more energy in the low pullback velocity than in the high one. PMID:25587351

Choi, Sun Young; Kwak, Byung Kook

2014-01-01

266

[Blood flow in the umbilical vein and artery in pregnancy].  

PubMed

Transplacental gas exchange and supply of nutritive substances to the foetus is guaranteed by an increase of umbilical blood flow (Qnv). It was investigated, whether the umbilical blood flow (Qnv) is influenced by physiological conditions during pregnancy and if changes occur in the umbilical blood flow velocity wave forms. In this study, 31 pregnant women between the 24th to 40th week of gestation were examined with a pulsed wave duplex scanner ADR Kranzbühler 8150. The mean flow velocity (Vnv) of the umbilical vein and the diameter of the vessel were parameters, which were included in the calculation of the umbilical blood flow. The flow profile of the umbilical artery allowed determination of the maximum systolic frequency (Fmax) and the end-diastolic frequency (Fmin). Based on these data, three indices--RI, PI, S/D ratio were calculated. The blood flow of the umbilical vein (Qnv) shows a linear increase up to the 36th week of gestation and remains at this level thereafter. The increase of umbilical blood flow (Qnv) is mainly caused by an increase of the diameter of the umbilical vein (81%, 26th-40th week of gestation) and to a lesser degree by an increase of the mean flow velocity (Vnv) (18%, 26th-40th week of gestation). The diameter of the vein is highly correlated both with the foetal birth weight (r = 0.60) and the umbilical blood flow (Qnv) (r = 0.73). Throughout pregnancy, flow velocity waveforms showed significant changes of the maximum systolic frequency (Fmax) from 973 Hz (SD 128 Hz; 26th week of gestation) to 1130 Hz (SD 152 Hz; 40th week of gestation) and an increase of the end-diastolic frequency (Fmin) from 246 Hz (SD 58 Hz; 26th week of gestation) to 423 Hz (SD 91 Hz; 40th week of gestation). The higher increase of the end-diastolic frequency (Fmin) results in a decrease of the resistance index (RI), pulsatility index (PI) and SD-ratio. None of the investigated cases showed an end-diastolic frequency (Fmin) of less than 200 Hz. These results reveal, that determination of the blood flow of the umbilical vein mainly depends on measuring the diameter of the vessel rather than on measurements of the blood flow velocity (Qnv) of the vein. With the presently available equipment, accurate measurements of the diameter are very difficult. The increase of blood flow of the umbilical vein is not proportional to the foetal growth; moreover, it remains constant from the 36th week of gestation.(ABSTRACT TRUNCATED AT 400 WORDS) PMID:1936859

Künzel, W; Jovanovic, V; Grüssner, S

1991-07-01

267

Percutaneous transhepatic sclerotherapy with embolization of the drainage vein for a gastric varix  

PubMed Central

We experienced a case with a gastric varix that did not have a catheterizable main drainage vein and had multiple afferent veins. For this case we successfully performed percutaneous transhepatic sclerotherapy using the following procedure. After the drainage vein was embolized by metallic coils and n-butyl cyanoacrylate from a microcatheter that was advanced through the gastric varix, 5% ethanolamine oleate-iopamidol was infused into the gastric varix from one main afferent vein under balloon occlusion. PMID:25298873

Yamagami, Takuji; Miura, Hiroshi; Okuda, Kotaro

2014-01-01

268

Percutaneous transhepatic sclerotherapy with embolization of the drainage vein for a gastric varix.  

PubMed

We experienced a case with a gastric varix that did not have a catheterizable main drainage vein and had multiple afferent veins. For this case we successfully performed percutaneous transhepatic sclerotherapy using the following procedure. After the drainage vein was embolized by metallic coils and n-butyl cyanoacrylate from a microcatheter that was advanced through the gastric varix, 5% ethanolamine oleate-iopamidol was infused into the gastric varix from one main afferent vein under balloon occlusion. PMID:25298873

Yoshimatsu, Rika; Yamagami, Takuji; Miura, Hiroshi; Okuda, Kotaro

2014-08-01

269

Automatic determination of the artery vein ratio in retinal images  

NASA Astrophysics Data System (ADS)

A lower ratio between the width of the arteries and veins (Arteriolar-to-Venular diameter Ratio, AVR) on the retina, is well established to be predictive of stroke and other cardiovascular events in adults, as well as an increased risk of retinopathy of prematurity in premature infants. This work presents an automatic method that detects the location of the optic disc, determines the appropriate region of interest (ROI), classifies the vessels in the ROI into arteries and veins, measures their widths and calculates the AVR. After vessel segmentation and vessel width determination the optic disc is located and the system eliminates all vessels outside the AVR measurement ROI. The remaining vessels are thinned, vessel crossing and bifurcation points are removed leaving a set of vessel segments containing centerline pixels. Features are extracted from each centerline pixel that are used to assign them a soft label indicating the likelihood the pixel is part of a vein. As all centerline pixels in a connected segment should be the same type, the median soft label is assigned to each centerline pixel in the segment. Next artery vein pairs are matched using an iterative algorithm and the widths of the vessels is used to calculate the AVR. We train and test the algorithm using a set of 25 high resolution digital color fundus photographs a reference standard that indicates for the major vessels in the images whether they are an artery or a vein. We compared the AVR values produced by our system with those determined using a computer assisted method in 15 high resolution digital color fundus photographs and obtained a correlation coefficient of 0.881.

Niemeijer, Meindert; van Ginneken, Bram; Abràmoff, Michael D.

2010-03-01

270

Noncirrhotic portal vein thrombosis. Physiology before and after shunts.  

PubMed Central

Controversy exists concerning the proper therapy for bleeding gastroesophageal varices secondary to noncirrhotic portal vein thrombosis. Disparity of opinion exists regarding the significance of hepatic portal blood flow and the consequences of total portal-systemic shunts in this condition. One patient is presented who developed severe, crippling encephalopathy 20 years after a central splenorenal shunt. This was associated with loss of portal flow to the liver and marked nitrogen intolerance. Closure of the shunt resulted in restoration of hepatic portal flow via collateral veins (HPI 0.36), clearance of encephalopathy and return to near normal protein tolerance. An additional patient was studied with hyperammonemia and early suggestive signs of encephalopathy eight years following a mesocaval shunt. Four patients were evaluated before and after selective distal splenorenal shunts. All had "cavernous transformation" of the portal vein with angiographic evidence of portal flow to the liver. Postoperative angiograms revealed continued hepatic portal perfusion and a patent shunt in each patient. Radionuclide imaging postoperatively gave an estimated portal fraction of total hepatic blood flow (HPI) of .39 and .60 in two of the four patients. We conclude that 1) there is significant hepatic portal perfusion in noncirrhotic portal vein thrombosis (cavernous transformation), 2) loss of this hepatic portal flow following total shunts can lead to severe encephalopathy, 3) the selective distal splenorenal shunt maintains hepatic portal perfusion and is the procedure of choice when there is a patent splenic vein and surgical intervention is indicated. Images Fig. 2. Fig. 3. Fig. 4. Fig. 5. Fig. 6. Fig. 7. Fig. 9a. Fig. 9b. Fig. 9c. PMID:7416830

Warren, W D; Millikan, W J; Smith, R B; Rypins, E B; Henderson, J M; Salam, A A; Hersh, T; Galambos, J T; Faraj, B A

1980-01-01

271

Salvage of poorly developed arteriovenous fistulae with percutaneous ligation of accessory veins  

Microsoft Academic Search

Many arteriovenous (AV) fistulae fail to achieve an adequate blood flow or size for successful cannulation because of accessory veins. We describe a simple technique to ligate accessory veins that does not require a surgical incision. In this retrospective study, 17 end-stage renal disease patients underwent ligation of accessory veins of poorly developed AV fistulae. There were 14 men and

Rashid Faiyaz; Kenneth Abreo; Fahim Zaman; Aslam Pervez; Gazi Zibari; Jack Work

2002-01-01

272

HMG-CoA Reductase Inhibitors Reduce Matrix Metalloproteinase-9 Activity in Human Varicose Veins  

Microsoft Academic Search

Matrix metalloproteinases (MMPs) have been implicated in tissue degradation in varicose veins. The aim of this study was to investigate the effects of 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (statins) on the activity of MMPs in varicose veins. MMP-9 was present at significantly higher levels in varicose veins than in controls and was localized mainly in smooth muscle cells at the

S. Nomura; K. Yoshimura; N. Akiyama; A. Mikamo; A. Furutani; H. Aoki; M. Matsuzaki; K. Hamano

2005-01-01

273

A health professional's guide for use and operation of the AccuVein AV400  

E-print Network

English AV400 #12;Caution Consult operating instructions Refer to instruction manual/booklet The AV400 as the sole vein location method, and it is not a substitute for sound medical judgment and the visual with visual detection and palpation techniques. AV400 User Manual © AccuVein Inc. 2012 AccuVein Inc. 40 Goose

Oliver, Douglas L.

274

Retrieval and analysis of particulate debris after saphenous vein graft intervention  

Microsoft Academic Search

OBJECTIVESThis study was designed to evaluate the composition and quantity of particulate debris resulting from vein graft intervention.BACKGROUNDDistal embolization and “no reflow” are frequent and important complications resulting from angioplasty of diseased saphenous vein grafts. Little is known about the composition and quantity of embolic particulate debris associated with vein graft intervention, and no intervention has been shown to protect

John G. Webb; Ronald G. Carere; Renu Virmani; Donald Baim; Paul S. Teirstein; Patrick Whitlow; Colleen McQueen; Frank D. Kolodgie; Elizabeth Buller; Arthur Dodek; G. B. John Mancini; Stephen Oesterle

1999-01-01

275

Dedolomitization in tectonic veins and stylolites: evidence for rapid fluid migration during deformation  

Microsoft Academic Search

Jurassic through Tertiary thrust-belt deformation of the Mississippian Madison Group has introduced complex fracturing, stylolitization, and carbonate vein mineralization. Host rocks are dominantly dolostone and dolomitic limestone. Tectonic veins are mineralized first by dolomite and then by multiple calcite phases. Dolomite and some generations of calcite which line veins are highly luminescent, while host-rock dolomite have been corroded and replaced

Joyce M. Budai

1984-01-01

276

Thrombosis of the greater saphenous vein in a collegiate football place kicker.  

PubMed

The greater saphenous vein is vulnerable in its superficial course overlying the distal tibia in the zone of impact of a kicker's foot. Minor repetitive trauma or a single traumatic event to this area may subject the vein to intimal trauma or other irregularities that may lead to vein thrombosis. PMID:12046914

Robbe, Rudy; Mair, Scott; Johnson, Darren; Madaleno, Jim

2002-05-01

277

Finite Element simulation of buckling-induced vein tortuosity and influence of the wall constitutive  

E-print Network

of varicose veins may precede the mechanical aspects of the disease. To test the hypothesis of tortuosity-induced changes in the varicose vein wall. Based on a 3D model of the leg and in vivo identification of the material properties of varicose veins, a clinical validation of these findings is being developed. hal

Paris-Sud XI, Université de

278

Evaluating and improving health-related quality of life in patients with varicose veins  

Microsoft Academic Search

Purpose: We set out to assess the new Aberdeen Varicose Veins Questionnaire (Aberdeen Questionnaire) for the properties necessary for a valid measure of health outcome, to determine quality of life of patients with varicose veins, and to determine the effect of surgery on quality of life. Methods: A prospective consecutive cohort of 137 patients undergoing varicose vein surgery completed the

J. J. Smith; A. M. Garratt; M. Guest; R. M. Greenhalgh; A. H. Davies

1999-01-01

279

Varicose Veins in Women Cotton Workers. An Epidemiological Study in England and Egypt  

Microsoft Academic Search

The prevalence of varicose veins was studied in 504 women cotton workers in England and 467 in Egypt, by a standardized questionary and a specially developed method of examination. The English mill population showed a much higher prevalence of varicose veins than the Egyptian, probably owing to environmental rather than ethnic reasons.Among the European women the prevalence of varicose veins

Siza Mekky; R. S. F. Schilling; Joan Walford

1969-01-01

280

Biomechanical response of varicose veins to2 elastic compression: a numerical study3  

E-print Network

1 1 Biomechanical response of varicose veins to2 elastic compression: a numerical study3 4 Rohan C Email: rohan@emse.fr19 20 Keywords: Varicose veins; trans-mural pressure; Finite Element Updating the biomechanical response of varicose veins28 to compression treatment. The aim is to investigate the relationship

Paris-Sud XI, Université de

281

Biochemical Assay of Collagen and Elastin in the Normal and Varicose Vein Wall  

Microsoft Academic Search

Alterations of the connective tissue in the varicose vein wall have been noted by several investigators; however, the cause of the vein dilatation has still not been established. The aim of this study was to find a biochemical explanation to the development of varices by evaluating sensitive biochemical markers of collagen and elastin in the varicose vein wall. 4-L-Hydroxyproline (HYP),

Marco Venturi; Luigi Bonavina; Federico Annoni; Laura Colombo; Caterina Butera; Alberto Peracchia; Emilio Mussini

1996-01-01

282

Varicose disease affects the P2 receptor-mediated responses of human greater saphenous vein  

E-print Network

Varicose disease affects the P2 receptor-mediated responses of human greater saphenous vein Airat U mediated contractions in human greater saphenous veins, which are impaired by varicose disease, in contrast rights reserved. Keywords: P2 receptors; Human saphenous vein; Varicose disease 1. Introduction

Burnstock, Geoffrey

283

Use of AccuVein™ for preventing complications from accidental venipuncture when administering dermal filler injections.  

PubMed

Abstract Near-infrared technology is used to map out superficial veins to improve the safety of esthetic dermal filler injections. The use of the AccuVein™ device is described and illustrated. Possible benefits of regular use of vein finder technology are discussed. PMID:25260136

Lee, Georgia S K

2015-02-01

284

Suprahepatic vein oxygen tension in alcoholics with severe and mild liver damage  

Microsoft Academic Search

We measured suprahepatic vein and arterial partial oxygen pressure in 35 alcoholics with severe (N=7) or mild (N=28) histological liver damage and without evidence of clinical liver failure. The suprahepatic vein was punctured with a fine needle, using a percutaneous approach. Suprahepatic vein partial oxygen pressure was lower and arterial-suprahepatic gradient higher in alcoholics with severe liver damage compared to

Daniel Bunout; Patricia Moya; María Pía de la Maza; Margarita Petermann; Hernán Iturriaga; Sandra Hirsch

1995-01-01

285

Prevalence of varicose veins and chronic venous insufficiency in men and women in the general population: Edinburgh Vein Study  

Microsoft Academic Search

STUDY OBJECTIVE: To determine the prevalence of varicose veins and chronic venous insufficiency (CVI) in the general population. DESIGN: Cross sectional survey. SETTING: City of Edinburgh. PARTICIPANTS: Men and women aged 18-64 years selected randomly from age-sex registers of 12 general practices. MAIN RESULTS: In 1566 subjects examined, the age adjusted prevalence of trunk varices was 40% in men and

C. J. Evans; F. G. Fowkes; C. V. Ruckley; A. J. Lee

1999-01-01

286

Accelerated intimal hyperplasia in aortocoronary internal mammary vein grafts in minipigs  

PubMed Central

Background More than 50% of aortocoronary saphenous vein grafts are occluded 10 years after surgery. Intimal hyperplasia is the initial critical step in the progression toward occlusion. Internal mammary veins, which are physiologically prone to less hydrostatic pressure, may undergo an accelerated progression to intimal hyperplasia and thus be suitable for investigation of the mechanisms of aortocoronary vein graft disease. Methods Six minipigs underwent aortocoronary bypass grafting using standard cardiopulmonary bypass and cardioplegic arrest. Mammary vein were grafted in a reversed manner from ascending aorta to left anterior descending coronary artery (LAD). The proximal LAD was ligated, rendering the anterior left ventricle vein graft-dependent. Minipigs were killed after 4 weeks, and vein grafts were harvested. Histological and immunohistological investigation were performed with respect to morphometric analysis, endothelial damage/dysfunction (v-Willebrand-factor (vWF)), smooth muscle cells (?-smooth actin) and proliferation rate (proliferation marker Ki 67). Results Mean intimal area of vein grafts was increased compared to ungrafted mammary veins. Intimal hyperplasia in vein grafts was characterized by massive accumulation of smooth muscle cells with a high proliferation rate and endothelial perturbation. Significant (p = 0.001) intimal hyperplasia of the grafted mammary vein compared to the ungrafted mammary vein was found. These changes were absent in ungrafted mammary veins. Conclusion The present study demonstrates a pig model of aortocoronary vein graft intimal hyperplasia which is characterized by an accelerated progression within internal mammary veins. The model is suitable to investigate the pathophysiology of aortocoronary vein graft intimal hyperplasia as well as therapeutic approaches. PMID:18445288

Popov, Aron Frederik; Dorge, Hilmar; Hinz, Jose; Schmitto, Jan Dieter; Stojanovic, Tomislav; Seipelt, Ralf; Didilis, Vassilios; Schoendube, Friedrich Albert

2008-01-01

287

Outcome of Endovenous Laser Ablation of Varicose Veins  

PubMed Central

ABSTRACT Introduction: In Bosnia and Herzegovina according to available data, treatment of incompetent superficial lower extremity varicose veins by endovenous laser ablation (EVLA) has been introduced two years ago and so far no paper has been published regarding results of EVLA treatment of patients from our country. We wanted to present our results with EVLA treatment. Aim of study: to evaluate and compare primary posttreatment outcomes of endovenous laser ablation (EVLA) with classical surgical method of varicose vein treatment. Patients and methods: The study was clinical and prospective. It was carried out at Clinic for vascular surgery in Sarajevo where fifty-eight (58) patients received surgical treatment for varicose veins and in Aesthetic Surgery Center “Nasa mala klinika” in Sarajevo were sixty-one (61) patients with varicose veins were treated by endovenous laser ablation. Total 119 patients (limbs) with pathologic reflux only in great saphenous vein were evaluated between 1st of January 2013 and 31st of April 2014. Following primary outcome endpoints were evaluated smean day of return to normal everyday activities, patient subjective quantification of pain during first seven days after intervention, incidence of deep venous thrombosis (DVT), incidence of wound bleeding requiring surgical intervention, incidence of peri-saphenous vein hematoma and infection rate. Results: Mean of return to normal activities (expressed in days after intervention); EVLA vs. stripping (surgery) =1.21vs12.24, T test 13,619; p=0, 000, p<0,05. T test was used for comparing Mean value of visual pain analog scale for the first 7 days between groups, for all seven days pain was significantly higher in surgical group of patients as compared to EVLA group; p<0,05. Incidence of hematoma greater than 1% of total body surface area was significantly higher in patients receiving surgical treatment; Pearson Chi Square=23,830, p<0,05; odds ratio:10,453. Incidences of infection, deep venous thrombosis and posttreatment bleeding were not statistically different between analyzed groups; EVLA vs Surgery (Pearson Chi Square =3,237; p>0,05; Pearson Chi Square=2,139, p>0,05, Pearson Chi Square=2,139, p>0,05, respectively.) Conclusion: EVLA offers better patient recovery in terms of significantly lower post treatment pain, faster return to everyday activities and lower incidence of bruising (hematomas). PMID:25568583

Rustempasic, Nedzad; Cvorak, Alemko; Agincic, Alija

2014-01-01

288

Endovenous Laser Ablation of Incompetent Perforator Veins: A New Technique in Treatment of Chronic Venous Disease  

SciTech Connect

The aim of this study was to assess the feasibility of endovenous laser ablation of incompetent perforator veins in a patient with incompetency of the small saphenous vein and multiple perforator veins. Two different methods were used to ablate seven perforator veins with a laser giving 50-60 J/cm energy. Total occlusion was observed in six perforators, and partial ablation in one perforator, at 1-month follow-up. To our knowledge, endovenous laser ablation of incompetent perforator veins is easy and a good therapeutic method.

Ozkan, Ugur, E-mail: radugur@yahoo.co [Baskent University, Faculty of Medicine, Department of Radiology (Turkey)

2009-09-15

289

Varicose veins: look before you strip - the occluded inferior vena cava and other lurking pathologies.  

PubMed

Lower limb varicose veins are a common complication of bipedal human movement and deep-vein thrombosis. However, they may have unusual causes, e.g. forming as collaterals around an obstruction or resulting from vascular malformations. Surgery in these cases can be inappropriate or harmful. Five cases of lower limb varicose veins in which there was underlying pathology highlight the fact that cursory examination of patients with varicose veins and inappropriate special investigations can miss rare but significant underlying pathology. Patients should be examined systematically, and varicose veins in unusual situations should alert the clinician. Inappropriate surgery can be harmful. PMID:25363049

Mokoena, Taole

2014-10-01

290

Relationship between Specific Distributions of Isolated Soleal Vein Thrombosis and Risk Factors  

PubMed Central

Objective: The relationship between specific distributions of isolated soleal vein thrombosis (SVT) and risk factors was investigated. Subjects and Methods: The subjects included 93 patients with SVT diagnosed with ultrasonography. Results: In the acute thrombus distribution, the thrombi of central veins were significantly more frequent than the thrombi of medial veins in the unilateral SVT. The thrombi of central veins were not more significantly frequent than the thrombi of medial veins in the bilateral SVT. Conclusion: The risk factors of bilateral SVT are considered to be different from that of the unilateral SVT. (*English translation of J Jpn Coll Angiol 2013; 53: 159-166) PMID:25298825

Ohgi, Nagako

2014-01-01

291

Transient Thrombocytosis after Endovenous Laser Treatment for Primary Varicose Vein of the Lower Extremity  

PubMed Central

We presented a case of a completely occluded great saphenous vein and transient thrombocytosis following endovenous laser treatment (EVLT) for primary varicose veins of the lower extremity. A 54-year-old man with a left saphenous varicose vein underwent EVLT surgery. Twelve-watt laser irradiation was delivered over the length of 33 cm of the saphenous vein. The cumulative exposure was 1042 J. Nine days after treatment, the platelet count increased up to 610 ? 103 /mm3 and returned to normal after 2 months. A complete occlusion of the great saphenous vein commonly occurs after EVLT, but no case of transient thrombocytosis has been reported. PMID:23555450

Sugawara, Hiromitsu; Ichiki, Masataka; Sai, Keijyo; Kamata, Keisuke; Ansai, Makoto

2011-01-01

292

Internal jugular vein: Peripheral vein adrenocorticotropic hormone ratio in patients with adrenocorticotropic hormone-dependent Cushing's syndrome: Ratio calculated from one adrenocorticotropic hormone sample each from right and left internal jugular vein during corticotrophin releasing hormone stimulation test  

PubMed Central

Background: Demonstration of central: Peripheral adrenocorticotropic hormone (ACTH) gradient is important for diagnosis of Cushing's disease. Aim: The aim was to assess the utility of internal jugular vein (IJV): Peripheral vein ACTH ratio for diagnosis of Cushing's disease. Materials and Methods: Patients with ACTH-dependent Cushing's syndrome (CS) patients were the subjects for this study. One blood sample each was collected from right and left IJV following intravenous hCRH at 3 and 5 min, respectively. A simultaneous peripheral vein sample was also collected with each IJV sample for calculation of IJV: Peripheral vein ACTH ratio. IJV sample collection was done under ultrasound guidance. ACTH was assayed using electrochemiluminescence immunoassay (ECLIA). Results: Thirty-two patients participated in this study. The IJV: Peripheral vein ACTH ratio ranged from 1.07 to 6.99 (n = 32). It was more than 1.6 in 23 patients. Cushing's disease could be confirmed in 20 of the 23 cases with IJV: Peripheral vein ratio more than 1.6. Four patients with Cushing's disease and 2 patients with ectopic ACTH syndrome had IJV: Peripheral vein ACTH ratio less than 1.6. Six cases with unknown ACTH source were excluded for calculation of sensitivity and specificity of the test. Conclusion: IJV: Peripheral vein ACTH ratio calculated from a single sample from each IJV obtained after hCRH had 83% sensitivity and 100% specificity for diagnosis of CD. PMID:23776865

Chittawar, Sachin; Bhattacharya, Saptarshi; Sahoo, Jai Prakash; Prakash, Siva; Bhalla, Ashu Seith; Kandasamy, Devasenathipathy; Arora, Arundeep; Gupta, Nandita; Tandon, Nikhil; Goswami, Ravinder; Khadgawat, Rajesh; Jyotsna, Viveka P.; Karak, Ashish Kumar; Bal, Chandra Sekhar; Pandey, Ravindra Mohan; Kumar, Guresh; Ammini, Ariachery C.

2013-01-01

293

Cranial dural arteriovenous shunts. Part 1. Anatomy and embryology of the bridging and emissary veins.  

PubMed

We reviewed the anatomy and embryology of the bridging and emissary veins aiming to elucidate aspects related to the cranial dural arteriovenous fistulae. Data from relevant articles on the anatomy and embryology of the bridging and emissary veins were identified using one electronic database, supplemented by data from selected reference texts. Persisting fetal pial-arachnoidal veins correspond to the adult bridging veins. Relevant embryologic descriptions are based on the classic scheme of five divisions of the brain (telencephalon, diencephalon, mesencephalon, metencephalon, myelencephalon). Variation in their exact position and the number of bridging veins is the rule and certain locations, particularly that of the anterior cranial fossa and lower posterior cranial fossa are often neglected in prior descriptions. The distal segment of a bridging vein is part of the dural system and can be primarily involved in cranial dural arteriovenous lesions by constituting the actual site of the shunt. The veins in the lamina cribriformis exhibit a bridging-emissary vein pattern similar to the spinal configuration. The emissary veins connect the dural venous system with the extracranial venous system and are often involved in dural arteriovenous lesions. Cranial dural shunts may develop in three distinct areas of the cranial venous system: the dural sinuses and their interfaces with bridging veins and emissary veins. The exact site of the lesion may dictate the arterial feeders and original venous drainage pattern. PMID:25468011

Baltsavias, Gerasimos; Parthasarathi, Venkatraman; Aydin, Emre; Al Schameri, Rahman A; Roth, Peter; Valavanis, Anton

2014-12-01

294

Donor gonadal vein reconstruction for extension of the transected renal vessels in living renal transplantation  

PubMed Central

Introduction: Donor gonadal vein is a readily available vascular reconstruction material for vascular reconstruction, for difficult situations, in living related renal transplantation. Vein extension with the gonadal vein has been described as a simple and safe method to elongate renal vein especially in right living donor kidneys. We applied the donor gonadal vein for lacerated accessory renal artery and renal vein reconstruction. Materials and Methods: The donor gonadal vein was used to reconstruct the lacerated accessory renal artery in one patient. The donor gonadal vein was isolated, used as an interposition graft to bridge the gap between transected accessory renal artery and external iliac artery of the recipient. In another patient, gonadal vein was used to reconstruct short right renal vein, which got damaged during retrieval. Results: This technique resulted in a tension-free anastomosis. There were no procedure related complications. The ischemia time remained within acceptable limits and grafts showed excellent outcomes. Conclusions: The use of gonadal vein for renal vascular reconstruction seems to be an acceptable option during living related renal transplantation, lest the need arise, with no increased graft morbidity. PMID:20877621

Veeramani, Muthu; Jain, Vikas; Ganpule, Arvind; Sabnis, R. B.; Desai, Mahesh R.

2010-01-01

295

Varicose vein trauma: a risk for pulmonary embolism.  

PubMed

Pulmonary embolism (PE) is a deceptive condition which is often incorrectly diagnosed leading to high morbidity and mortality. We present a case where symptoms were localised to different areas of the body starting with post-traumatic pain over lower extremity varicosities that migrated sequentially over a month to the knee, hip, back, abdomen and chest finally presenting as syncope. Despite a low pre-test clinical probability, a very high index of suspicion led to a timely diagnosis of a massive bilateral PE that eventually caused a troponin leak. The aetiology is highly suspicious of a thrombus which originated in the veins of the leg due to trauma over varicose veins.The case described here exemplifies the importance of considering trauma to varicosities as a risk factor for embolism when the clinical picture is concerning but other signs and symptoms of PE are not apparent. PMID:25478387

Joy, Parijat S; Marak, Creticus P; Ponea, Anna M; Guddati, Achuta K

2014-10-01

296

Spontaneous Rupture of Uterine Vein in Twin Pregnancy  

PubMed Central

Objective. Aim of our study is to present a case of a twin pregnancy following invitro fertilization cycle complicated with hemoperitoneum at third trimester. Case. A 26-year-old nulliparous pregnant woman at 32 weeks of gestation with twin pregnancy following invitro fertilization cycle complained of abdominal pain. After 48 hours of admission, laparotomy was performed with indications of aggravated abdominal pain and decreased hemoglobin levels. Utero-ovarian vein branch rupture was detected on the right posterior side of uterus and bleeding was stopped by suturing the vein. Etiopathogenesis of the present case still remains unclear. Conclusion. Spontaneous rupture of the uterine vessels during pregnancy is a rare complication and may lead to maternal and fetal morbidity and mortality. Diagnosis and treatment are based on the clinical symptoms of acute abdominal pain and laboratory tests of hypovolemic shock signs. PMID:24455353

Doger, Emek; Cakiroglu, Yigit; Yildirim Kopuk, Sule; Akar, Bertan; Caliskan, Eray; Yucesoy, Gulseren

2013-01-01

297

Spontaneous rupture of uterine vein in twin pregnancy.  

PubMed

Objective. Aim of our study is to present a case of a twin pregnancy following invitro fertilization cycle complicated with hemoperitoneum at third trimester. Case. A 26-year-old nulliparous pregnant woman at 32 weeks of gestation with twin pregnancy following invitro fertilization cycle complained of abdominal pain. After 48 hours of admission, laparotomy was performed with indications of aggravated abdominal pain and decreased hemoglobin levels. Utero-ovarian vein branch rupture was detected on the right posterior side of uterus and bleeding was stopped by suturing the vein. Etiopathogenesis of the present case still remains unclear. Conclusion. Spontaneous rupture of the uterine vessels during pregnancy is a rare complication and may lead to maternal and fetal morbidity and mortality. Diagnosis and treatment are based on the clinical symptoms of acute abdominal pain and laboratory tests of hypovolemic shock signs. PMID:24455353

Doger, Emek; Cakiroglu, Yigit; Yildirim Kopuk, Sule; Akar, Bertan; Caliskan, Eray; Yucesoy, Gulseren

2013-01-01

298

Inferior Vena Cava Anomaly: A Risk for Deep Vein Thrombosis  

PubMed Central

Context: Inferior vena cava (IVC) anomalies have a 0.5% incidence rate and could be associated with other congenital abnormalities. In later stage of the disease, trophic ulcers with or without deep vein thrombosis (DVT) is consistent finding. Case Report: A 29-year-old male patient presented with recurrent lower extremity ulcers. Further workup revealed an absent infrahepatic inferior vena cava, prominently dilated azygos and hemiazygos veins with enlarged retroperitoneal collaterals without DVT. Conclusion: IVC anomaly should be suspected in a young patient presenting with unexplained venous thrombosis and recurrent ulcers of a lower extremity. IVC anomaly would inherently lead to blood flow stasis and endothelial injury. Thus per Virchow's triad, other risk factors for hypercoagulability such as physical inactivity, smoking tobacco, oral contraceptive pills should be avoided and when hereditary thrombophilias or other irreversible risk factors are present, lifelong anticoagulation should be considered. PMID:25535612

Sitwala, Puja S; Ladia, Vatsal M; Brahmbhatt, Parag B; Jain, Vinay; Bajaj, Kailash

2014-01-01

299

Isolated rupture of the superficial vein of the penis  

PubMed Central

Penile emergencies are rare but when they do occur, prompt diagnosis and treatment are warranted. Emergent conditions of the male genitalia are mainly traumatic, vascular or infectious. Penile emergencies are usually caused by trauma to the penis, during sexual intercourse or manipulation of an erect penis during masturbation. One of the traumatic vascular penile emergencies is superficial penile dorsal vein rupture. This is a rare condition, with just a few reported cases. It is usually taken into differential diagnosis with the other acute penile injuries that present, such as acute penile edema or ecchymosis. We report a case of 59-year-old male with a superficial penile dorsal vein rupture which occurred during manipulation of the erect penis. PMID:24940469

Eken, Alper; Acil, Meltem; Arpaci, Taner

2014-01-01

300

Right atrial thrombus due to internal jugular vein catheter.  

PubMed

Right atrial thrombus is rare complication of hemodialysis central venous catheter. Literature survey revealed 49 documentations of right atrial thrombus due to a central venous catheter. We report a 58-year-old type 2 diabetic, hypertensive, end-stage renal disease patient, who 2 months after initiation of hemodialysis through a right internal jugular vein catheter, developed clinical features suggestive of pulmonary thromboembolism. An echocardiography revealed presence of a serpentine thrombus in right atrium. The internal jugular vein catheter was removed and unfractionated heparin was initiated. At the end of 6 weeks he was symptom free. We compared conservative treatment with surgery for RAT. Conservative management with central venous catheter removal and anticoagulation therapy is not inferior to the surgery. PMID:19614782

Ram, Rapur; Swarnalatha, Gudithi; Rakesh, Yarlagadda; Jyostna, Maddury; Prasad, Neela; Dakshinamurty, Kaligotla Venkata

2009-07-01

301

Characterization of the promoter of Grapevine vein clearing virus.  

PubMed

Grapevine vein clearing virus (GVCV) is a recently discovered DNA virus in grapevine that is closely associated with the grapevine vein clearing syndrome observed in vineyards in Missouri and surrounding states. The genome sequence of GVCV indicates that it belongs to the genus Badnavirus in the family Caulimoviridae. To identify the GVCV promoter, we cloned portions of the GVCV large intergenic region in front of a GFP gene present in an Agrobacterium tumefaciens binary vector. GFP expression was assessed by ELISA 3 days after agroinfiltration of Nicotiana benthamiana leaves. We found that the GVCV DNA segment between nts 7332 and 7672 directed expression of GFP and this expression was stronger than expression using the Cauliflower mosaic virus 35S promoter. It was revealed by 5' and 3' RACE that transcription was initiated predominantly at nt 7571 and terminated at nt 7676. PMID:25281563

Zhang, Y; Angel, C A; Valdes, S; Qiu, W; Schoelz, J E

2015-01-01

302

Interposition vein graft for giant coronary aneurysm repair  

NASA Technical Reports Server (NTRS)

Coronary aneurysms in adults are rare. Surgical treatment is often concomitant to treating obstructing coronary lesions. However, the ideal treatment strategy is poorly defined. We present a case of successful treatment of a large coronary artery aneurysm with a reverse saphenous interposition vein graft. This modality offers important benefits over other current surgical and percutaneous techniques and should be considered as an option for patients requiring treatment for coronary aneurysms.

Firstenberg, M. S.; Azoury, F.; Lytle, B. W.; Thomas, J. D.

2000-01-01

303

Preoperative portal vein embolization using an amplatzer vascular plug  

Microsoft Academic Search

The purpose was to evaluate the safety and efficacy of preoperative portal vein embolization (PVE) using an Amplatzer vascular\\u000a plug (AVP). Forty-one patients who underwent PVE using gelatin sponge particles and the AVP were enrolled. The right portal\\u000a branches were embolized using gelatin sponges (1–8 mm3) through a 5-F catheter, and the AVP was deployed at the first- or second-order right

Hyunkyung Yoo; Gi-Young Ko; Dong Il Gwon; Jin-Hyoung Kim; Hyun-Ki Yoon; Kyu-Bo Sung; Namguk Kim; Jeongjin Lee

2009-01-01

304

The fine structure of the human ovarian vein.  

PubMed Central

The human ovarian vein is of particular interest as an adult vessel which changes with the different phases of reproductive life. At the ultrastructural level we have characterised the endothelium, vascular smooth muscle and autonomic innervation of the human ovarian vein. Transmission electron micrographs were prepared from surgical specimens of the human ovarian vein (n = 11) to demonstrate the features of the vessel wall. The pattern of innervation was investigated using an image analysis system which was also used with high-magnification micrographs to count and measure axonal vesicle types. Possible relationships between ultrastructural features and age and reproductive history were investigated. Endothelial cells contained Weibel-Palade bodies and numerous microfilaments. There were 3 muscle coats: no elastic lamina separated the endothelium from an inner layer of smooth muscle; a middle smooth muscle layer consisted of cells orientated in a circular fashion; an outer smooth muscle layer was made up of longitudinally arranged smooth muscle bundles with collagen and nerves penetrating throughout. The percentage of the vessel thickness occupied by the middle circular smooth muscle layer ranged from 0 to 33% and fell with increasing age (r = -0.67, P < 0.05). Penetration of nerves into the circular layer was observed only in 2 of 9 specimens. The observed ultrastructural features are consistent with the ability of the ovarian vein to distend substantially in response to changing circulatory demands. The vascular endothelium may have a role in the local control of haemostasis via the synthesis and storage of von Willebrand factor.(ABSTRACT TRUNCATED AT 250 WORDS) Images Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 PMID:7961135

Stones, R W; Turmaine, M; Beard, R W; Burnstock, G

1994-01-01

305

Varicose veins in a Finnish population aged 40-60  

Microsoft Academic Search

STUDY OBJECTIVE--To assess the prevalence and the extent of treatment of varicose veins in a Finnish population. DESIGN--A prevalence study in a defined cohort was performed by using a mailed questionnaire. The method's validity was tested in a random sample of 166 individuals who were studied clinically. SUBJECTS--In 1989 a questionnaire was mailed to every resident born in 1929, 1939,

J Laurikka; T Sisto; O Auvinen; M Tarkka; E Läärä; M Hakama

1993-01-01

306

Arterialization of the portal vein in pediatric liver transplantation  

Microsoft Academic Search

Portal vein arterialization (PVA) is an acquired concept in shunt surgery for portal hypertension. This technique, recently\\u000a described as both a temporary and permanent procedure in adult liver transplantation, is reported by the authors in two cases\\u000a of pediatric transplantation. The indication was low portal blood flow after reperfusion with poor graft function due to persistence\\u000a of spontaneous retroperitoneal venous

Roberto Troisi; Ilse Kerremans; Eric Mortier; Luc Defreyne; Uwe J. Hesse; Bernard de Hemptinne

1998-01-01

307

Radial Optic Neurotomy in Central Retinal Vein Occlusion: Preliminary Results  

Microsoft Academic Search

Background: To investigate the efficacy of radial optic neurotomy (RON) on visual prognosis and clinical findings in central retinal vein occlusion (CRVO). Methods: Prospective, non-randomised, self-controlled comparative trial. Six patients with ischemic CRVO who had visual acuity (VA) less than or equal to 0.1 and duration of CRVO at least 1 month, and 6 patients with non-ischemic CRVO who maintained

Berkant Kaderli; Remzi Avci; Oner Gelisken

2004-01-01

308

Lipoma causing upper extremity deep vein thrombosis: a case report.  

PubMed

We report a case of lipoma in the right infraclavicular and axillary area compressing subclavian vein there by presenting with upper extremity deep venous thrombosis (UEDVT) and persistent symptoms of venous congestion. Patient was also found to be a heterozygous carrier of prothrombin 20210 gene mutation. Surgical excision of lipomatous tissue performed after 6 months of anticoagulation resulted in a complete resolution of symptoms. PMID:19728038

Palamari, Balavani; Breen, Jerome F; Wysokinski, Waldemar E

2010-07-01

309

Spectral Doppler of the Hepatic Veins in Tricuspid Valve Disease.  

PubMed

Spectral Doppler recording of the hepatic veins (HV) provides a semiquantitative assessment of tricuspid regurgitation (TR) severity. It complements findings on two-dimensional echocardiography and color Doppler imaging and helps to discriminate between hemodynamically significant and nonsignificant degree of regurgitation. In this manuscript, we discuss the usefulness of the HV Doppler for the diagnosis of tricuspid valve (TV) disease and provide examples of the various spectral Doppler patterns that assist in the quantification of TR. PMID:25250676

Fadel, Bahaa M; Almulla, Khaled; Husain, Aysha; Dahdouh, Ziad; Di Salvo, Giovanni; Mohty, Dania

2014-09-23

310

Idiopathic azygos vein aneurysm: a rare cause of mediastinal mass  

PubMed Central

Venous aneurysm of the azygos arch is a very rare cause of mediastinal mass and is usually an incidental finding on chest radiography. Nowadays the diagnosis is made by non-invasive tests such as thoracic CT scanning and/or magnetic resonance imaging. The case is described of an asymptomatic woman in whom a mediastinal mass due to an azygos vein aneurysm was diagnosed by non-invasive procedures, the aetiology of which, in all probability, was idiopathic.?? PMID:10377213

Gallego, M.; Mirapeix, R.; Castaner, E.; Domingo, C.; Mata, J.; Marin, A.

1999-01-01

311

Cyclic variation in onset of central retinal vein occlusion.  

PubMed Central

We studied the seasonal incidence of onset of symptoms of central retinal vein occlusion (CRVO) in 105 patients over a 5-year period. Their onset showed a significant cyclic variation (p less than 0.01), being most frequent in the months September through to February. We believe this seasonal variation may in part reflect seasonal changes in haemostasis and retinal perfusion, though other unidentified factors play a significant role. PMID:3814564

Lavin, M J; Dhillon, B J

1987-01-01

312

[Acute renal vein thrombosis in infancy (author's transl)].  

PubMed

Two cases of acute renal vein thrombosis are presented. Instead of angiography, sonography was used to perform the diagnosis. After short discription of the etiology, clinic and roentgensymptomatology, the sonographic semiology is emphasized. In the discussion the sonographic differentialdiagnosis is reviewed and the possible therapeutic proceedings are mentioned. The value of sonography as non-invasive method, especially in newborn is therefore established. PMID:159230

Schmoller, H; Engels, M; Rücker, J

1979-10-01

313

Temperature regulates the arrhythmogenic activity of pulmonary vein cardiomyocytes  

Microsoft Academic Search

Temperature plays an important role in the electrophysiology of cardiomyocytes. Pulmonary veins (PVs) are known to initiate paroxysmal atrial fibrillation. The effects of temperature on the arrhythmogenic activity of rabbit single PV and atrial cardiomyocytes were assessed using the whole-cell clamp technique. PV cardiomyocytes had different beating rates at low (22–25°C), normal (38–39°C) and high (40–41°C) temperatures (0.9±0.1, 3.2±0.4, 6.4±0.6

Yi-Jen Chen; Yao-Chang Chen; Paul Chan; Cheng-I. Lin; Shih-Ann Chen

2003-01-01

314

Reentry Anchoring at a Pair of Pulmonary Vein Ostia  

Microsoft Academic Search

\\u000a Recent findings in a sheep model of atrial fibrillation support the hypothesis that an organized micro-reentry could be the\\u000a maintaining mechanism of the arrhythmia (mother wavelet). According to these studies we constructed a two dimensional computer\\u000a model of tissue in the region around a pair of pulmonary vein ostia and investigated anchoring of a reentry wave at these\\u000a ostia. We

L. Wieser; Gerald Fischer; Florian Hintringer; S. Y. Ho; Bernhard Tilg

2005-01-01

315

Blood vessel classification into arteries and veins in retinal images  

NASA Astrophysics Data System (ADS)

The prevalence of diabetes is expected to increase dramatically in coming years; already today it accounts for a major proportion of the health care budget in many countries. Diabetic Retinopathy (DR), a micro vascular complication very often seen in diabetes patients, is the most common cause of visual loss in working age population of developed countries today. Since the possibility of slowing or even stopping the progress of this disease depends on the early detection of DR, an automatic analysis of fundus images would be of great help to the ophthalmologist due to the small size of the symptoms and the large number of patients. An important symptom for DR are abnormally wide veins leading to an unusually low ratio of the average diameter of arteries to veins (AVR). There are also other diseases like high blood pressure or diseases of the pancreas with one symptom being an abnormal AVR value. To determine it, a classification of vessels as arteries or veins is indispensable. As to our knowledge despite the importance there have only been two approaches to vessel classification yet. Therefore we propose an improved method. We compare two feature extraction methods and two classification methods based on support vector machines and neural networks. Given a hand-segmentation of vessels our approach achieves 95.32% correctly classified vessel pixels. This value decreases by 10% on average, if the result of a segmentation algorithm is used as basis for the classification.

Kondermann, Claudia; Kondermann, Daniel; Yan, Michelle

2007-03-01

316

Force-Sensing Microneedle for Assisted Retinal Vein Cannulation*  

PubMed Central

Retinal vein cannulation (RVC) is a challenging procedure proposed for drug delivery into the very small retinal veins. The available glass cannulas for this procedure are both hard to visualize and fragile thereby limiting the feasibility of both robot-assisted and manual RVC approaches. In this study, we develop and test a new force-sensing RVC instrument that can be easily integrated with the existing manual and robotic devices. The tool enables (1) the measurement of the forces required for puncturing retinal veins in vivo and (2) an assistive method to inform the operator of the needle piercing the vessel wall. The fiber Bragg grating based sensor can be inserted into the eye through a small (? 0.9 mm) opening and provides a quantitative assessment at the tool tip with a resolution smaller than 0.25 mN. Assessment of forces during vessel penetration in the chorioallantoic membranes of chicken embryos have revealed a consistent sharp drop in tool tip force upon vessel puncture that has been used as a signature to provide auditory feedback to the user to stop needle advancement and begin drug delivery. PMID:25580178

Gonenc, Berk; Gehlbach, Peter; Handa, James; Taylor, Russell H.; Iordachita, Iulian

2014-01-01

317

Potential Risk Factors for Varicose Veins with Superficial Venous Reflux  

PubMed Central

The objective of the study is to evaluate a range of potential risk factors in the etiology of varicose veins with superficial venous reflux. Forty-nine patients attending a cardiovascular surgery clinic for the management of varicose disease between 2009 and 2010 were enrolled for the study. The age range of the patient group was 44,04 ± 15,05 years and female/male (F/M) ratio was 30/19. Twenty-six normal, healthy volunteers with the age of 40,94 ± 13,60 years and with the female/male ratio of 15/11 acted as control subjects. We investigated several parameters including body mass index, age, birth number > 1, standing for a long time (standing for 8 or more hours without taking a break), systemic diseases, family history, venous Doppler f?ndings, the levels of homocysteine, ferritin, vitamin B12, and hemoglobin, sedimentation rate, mean corpuscular volume, low density lipoprotein, and rheumatoid factor of the patient group and the control group. We also determined the contribution of the methylene tetrahydrofolate reductase 677 C>T and 1298 A>C gene polymorphisms and FV Leiden in both groups. In this small study, there appears to be no association between varicose veins and body mass index, smoking, type 2 DM, hypertension, family history, and birth number. A history of increased standing duration period (>8 hours) and rheumatoid factor positivity have association with varicose veins with superficial venous reflux. PMID:25302121

Uzun Kulao?lu, Tülin; Fen, Turgay; Kap?s?z, Hasan Fahri

2014-01-01

318

Responsiveness of the SF36 and a condition-specific measure of health for patients with varicose veins  

Microsoft Academic Search

Approaches to measuring patient perceptions of outcome for varicose veins were tested using a postal questionnaire incorporating a clinically derived specific measure of varicose veins severity and the SF-36 health survey. The questionnaire was administered to 373 patients with varicose veins, 287 of whom had been referred to hospital for their varicose veins and 86 who had just consulted a

A. M. Garratt; D. A. Ruta; M. I. Abdalla; I. T. Russell

1996-01-01

319

Randomized clinical trial comparing endovenous laser ablation with surgery for the treatment of primary great saphenous varicose veins  

Microsoft Academic Search

Background: Endovenous laser ablation (EVLA) is a minimally invasive technique for treating varicose veins due to truncal vein incompetence. This randomized trial compared EVLA with conventional surgery in patients with primary saphenofemoral and great saphenous vein (GSV) reflux. Methods: Consecutive consenting patients with symptomatic varicose veins were randomized to EVLA 1 (stepwise laser withdrawal), EVLA 2 (continuous laser withdrawal) or

R. J. Darwood; N. Theivacumar; D. Dellagrammaticas; A. I. D. Mavor; M. J. Gough

2008-01-01

320

A patient with branch retinal vein occlusion accompanied by superior ophthalmic vein thrombosis due to severe superior ophthalmic vein enlargement in a patient with graves ophthalmopathy.  

PubMed

We report a patient with branch retinal vein occlusion (BRVO) accompanied by superior ophthalmic vein (SOV) thrombosis resulting from severe SOV enlargement in a patient with Graves ophthalmopathy (GO). A 78-year-old woman diagnosed with BRVO presented with reduced vision. She had a more than 20-year history of unilateral GO. Fluorescein angiography and spectralis optical coherence tomography revealed BRVO with cystoid macular edema. Approximately 5 months later, she complained of advanced left proptosis. A computed tomography scan at that time revealed dilated SOV with high internal attenuation due to SOV thrombosis of the left orbit. Because of the uncertain onset of SOV thrombosis and minimal signs of acute orbital congestion, we prescribed prophylactic daily aspirin to improve blood flow rather than a heparin-based treatment. In addition, she was treated with lubricants for exposure keratopathy and a dorzolamide/timolol eyedrops to prevent increases in intraocular pressure. This is the first clinical report of BRVO accompanied by SOV thrombosis due to SOV enlargement in chronic severe GO. It should be recognized that SOV thrombosis can lead to an increase in proptosis even in chronic GO. PMID:24978681

Park, Han Seok; Gye, Hyo Jeong; Kim, Joon Mo; Lee, Young Ji

2014-07-01

321

A comparison of outcomes and complications of totally implantable access port through the internal jugular vein versus the subclavian vein.  

PubMed

Totally implantable access ports (TIAPs) are generally used in oncology. Few studies have addressed complications associated with the insertion site. A total of 233 consecutive oncology patients were enrolled to receive TIAP inserts via internal jugular vein (IJV) or subclavian vein (SV). Data on clinicopathologic parameters and early/late complications were retrospectively collected. No differences were found early and late complication rates. Catheter injury was observed more frequently in the IJV group (2.9%) than in the SV group (1.0%) without statistical significance. Multivariate logistic regression analysis showed that age, switch to palliative use of TIAP, and the distribution of diseases (low risk in patients with colorectal cancer) were independent risk factors for determining complications. In conclusion, TIAP insertion site showed no impact on the early and late complication rates. Catheter injury appears to occur at the same frequency with both approaches. Therefore, medical doctors may choose their preferred puncture site when performing TIAP insertion. PMID:24670030

Nagasawa, Yoshinobu; Shimizu, Tomoharu; Sonoda, Hiromichi; Mekata, Eiji; Wakabayashi, Masato; Ohta, Hiroyuki; Murata, Satoshi; Mori, Tsuyoshi; Naka, Shigeyuki; Tani, Tohru

2014-01-01

322

Left renal vein ligation: a technique to mitigate low portal flow from splenic vein siphon during liver transplantation.  

PubMed

Low portal vein flows in liver transplant have been associated with poor allograft survival. Identifying and ameliorating causes of inadequate portal flow is paramount. We describe successful reversal of significant splenic vein siphon from a spontaneous splenorenal shunt during liver transplant. The patient is a 43-year-old male with cirrhosis from hepatitis C and Budd-Chiari syndrome, who had a variceal hemorrhage necessitating an emergent splenorenal shunt with 8 mm PTFE graft. Imaging in 2006 revealed thrombosis of the splenorenal shunt and evidence of a new spontaneous splenorenal shunt. The patient developed hepatocellular carcinoma and underwent transplant in 2009. After reperfusion, portal flows were low (150-200 mL/min). A mesenteric varix was ligated without improvement. Due to adhesions, direct collateral ligation was not attempted. In order to redirect the splenic siphon, the left renal vein was stapled at its confluence with the inferior vena cava. Portal flows subsequently increased to 1.28 L/min. Postoperatively, the patient had stable renal and liver function. We conclude that spontaneous splenorenal shunts can cause low portal flows. A diligent search for shunts with understanding of flow patterns is critical; ligation or rerouting of splanchnic flow may be necessary to improve portal flows and allograft outcomes. PMID:21668639

Slater, R R; Jabbour, N; Abbass, A Abou; Patil, V; Hundley, J; Kazimi, M; Kim, D; Yoshida, A; Abouljoud, M

2011-08-01

323

Embolization of Incompetent Pelvic Veins for the Treatment of Recurrent Varicose Veins in Lower Limbs and Pelvic Congestion Syndrome  

SciTech Connect

We present our experience with embolization of incompetent pelvic veins (IPV) in women with recurrence of varicose veins (VV) in lower limbs, as well as symptoms of pelvic congestion syndrome (PCS), after first surgery. In addition, we evaluated the effects of embolization in decreasing the symptoms of VV before surgery as well as its effects on PCS symptoms. We included 10 women who had consulted a vascular surgeon because of recurrent VV in lower limbs after surgery. All of these patients were included in the study because they also had symptoms of PCS, probably due to IPV. In patients who had confirmed IPV, we performed embolization before a second surgery. VV and PCS were assessed before and at 3 months after embolization (before the second surgery) using a venous clinical severity score (VCSS) and a visual analog pain scale (VAS), respectively. Patients were controlled between 3 and 6 months after embolization. Paired Student t test analysis was used for comparing data before and after embolization. Fifteen vein segments in 10 women were suitable for embolization. There was a significant (p < 0.001) decrease of VCSS after embolization, and recurrence of VV was not detected within a period of 6 months. There was also significant (p < 0.01) relief of chronic pelvic pain related to PCS evaluated using VAS at 3 months after embolization. Embolization decreases the risk of VV recurrence after surgery and also improves PCS symptoms in women with VV in lower limbs and IPV.

Meneses, Luis, E-mail: lmeneseq@gmail.com; Fava, Mario; Diaz, Pia; Andia, Marcelo [Pontificia Universidad Catolica de Chile, Radiology Department and Biomedical Imaging Center (Chile)] [Pontificia Universidad Catolica de Chile, Radiology Department and Biomedical Imaging Center (Chile); Tejos, Cristian; Irarrazabal, Pablo [Pontificia Universidad Catolica de Chile, Biomedical Imaging Center (Chile)] [Pontificia Universidad Catolica de Chile, Biomedical Imaging Center (Chile); Uribe, Sergio, E-mail: suribe@med.puc.cl [Pontificia Universidad Catolica de Chile, Radiology Department and Biomedical Imaging Center (Chile)] [Pontificia Universidad Catolica de Chile, Radiology Department and Biomedical Imaging Center (Chile)

2013-02-15

324

The posterior intercostal vein: a thermoregulatory gateway to the internal vertebral venous plexus.  

PubMed

The internal vertebral venous plexus (IVVP) plays a putative role in thermoregulation of the spinal cord. Cold cutaneous venous blood may cool, while warm venous blood from muscles and brown fat areas may warm the spinal cord. The regulating mechanisms for both cooling and warming are still unknown. Warm venous blood mainly enters the IVVP via the intervertebral veins. In the thoracic area these veins are connected to the posterior intercostal veins. In this study, anatomical structures were investigated that might support the mechanisms by which warmed venous blood from the intercostal muscles and the recently described paravertebral patches of brown adipose tissue are able to drain into the vertebral venous plexus. Therefore, tissue samples from human cadavers (n?=?21) containing the posterior intercostal vein and its connections to the IVVP and the azygos veins were removed and processed for histology. Serial sections revealed that the proximal parts of the posterior intercostal veins contained abundant smooth muscle fibers at their opening into the azygos vein. Furthermore, the walls of the proximal parts of the posterior intercostal veins contain plicae that allow the vessel to dilate, thereby allowing it to serve as a pressure chamber. It is suggested that a cold induced closure of the intercostal/azygos opening can result in retrograde blood flow from the proximal posterior intercostal vein towards the IVVP. This blood flow would be composed of warm blood from the paravertebral brown adipose tissue and blood containing metabolic heat from the muscles draining into the intercostal veins. PMID:23813753

Hoogland, P V; Wessels, Q; Vorster, W; Groen, R J M; Wettstein, R; Greyling, L M; Kotzé, S H

2013-09-01

325

Direct evidence for vein melting from Arctic MORB and peridotite  

NASA Astrophysics Data System (ADS)

The presence of enriched components in the mid-ocean ridge mantle is one of the “best known facts” of mantle petrology and geochemistry. Considerable debate however has been devoted to the storage of these components. On the one hand, many have argued that the mantle stores basaltic components primarily or exclusively as regions of increased fertility (ie cpx content). This camp argues that simple diffusion in the presence of a melt layer is sufficient to homogenize any steep chemical gradients in the mantle (e.g. Hofmann and Hart 1978) and that the mantle is well-stirred. Another point of view is based on the ubiquity of cpx-rich veins in the upper mantle of ophiolites (Wood, 1979) and argues that these are the primary carrier of enriched components in the upper mantle. Both models suffer from weaknesses. The first, more traditional view has difficulty reconciling with basalt compositions showing strong source effects, and garnet as an inferred residual phase in MORB with low partial melting degree. The vein hypothesis suffers from the fact that no vein melt has ever been found as more than a component in a trace element plot, and where such components have been found (e.g. SWIR Narrowgate and Macquarie Island) they appear to be local effects that do not exert a regional, much less global, influence on MORB composition. Our recent results from Lena Trough and Gakkel Ridge remove both of these objections. Lena trough basalts (3 dredge stations) show characteristics that cannot be produced by the low-degree partial melting of a peridotite source. They are a unique high-Si,Al ne-normative Hawaiite composition with up to 2% K2O and Ba > 200 ppm that has not before been dredged from mid-ocean ridges. Though their low iron content is indicative of shallow melting, they have strongly depleted HREE, clearly indicating a garnet bearing source. This apparent contradiction can be resolved by inferring direct derivation from a garnet eclogite source for these melts, with little or no contribution from peridotite-derived melting. Lena Trough peridotites dredged from nearby show evidence of having been residues of garnet-field melting (Hellebrand, et al., 2003), and may be related to this process. The basalts dredged from Lena Trough are composed of pure garnet eclogite vein melt, and not an inferred component in a trace element diagram. A high-SiO2, Al2O3, K, LREE component with low FeO exerts a considerable influence on basalt compositions from the Western Gakkel Ridge and northern Lena Trough. In particular the N. Lena basalts collected in 2004 show a strong component that is identical to the Lena Trough basalts. On its continuation into Gakkel Ridge, the influence of this Lena component provides the major source of enriched components in what is essentially 2-component mixing between veined and peridotite sources. This influence extends as far as the 3 degrees east discontinuity, showing that vein-derived enriched components play an important role in the petrogenesis, not only of a single locality, but of an entire region of ridge extending over many magmatic segments.

Snow, J. E.; Nauret, F.; Hellebrand, E.; Handt, A. V.

2006-12-01

326

Anatomical differences in responsiveness to vasoconstrictors in the mesenteric veins from normal and portal hypertensive rats  

Microsoft Academic Search

The present study evaluates the effects of pre-hepatic portal hypertension, induced in rats by partial portal vein ligation, on the responsiveness of rostral (proximal) and caudal (distal) rings from the mesenteric vein. The anatomical origin of the sample influenced the response to vasoconstrictors in sham-operated animals, and this pattern of reactivity was specifically modified in portal-ligated rats. In veins from

Lucrecia Moreno; M. A. Angeles Martínez-Cuesta; Jose M. Piqué; Jaume Bosch; Juan V. Esplugues

1996-01-01

327

Powered Phlebectomy (TriVexTM) in Treatment of Varicose Veins  

Microsoft Academic Search

  This study assesses the operation of transilluminated powered phlebectomy for removal of varicose veins. It was a prospective,\\u000a noncomparative, multicenter, pilot study designed to evaluate the safety and efficacy of the powered varicose vein extractor\\u000a for ablation of primary varicose veins. A total of 114 patients (117 limbs) were recruited from four centers in Europe and\\u000a four centers in the

Nick Cheshire; Steven M. Elias; Blair Keagy; R. Kolvenbach; Austin L. Leahy; W. Marston; F. Pannier-Fischer; Eberhard Rabe; Gregory A. Spitz

2002-01-01

328

Efficient gene transfer and durable transgene expression in grafted rabbit veins.  

PubMed

Venous bypass grafts are useful treatments for obstructive coronary artery disease. However, their usefulness is limited by accelerated atherosclerosis. Genetic engineering of venous bypass grafts that prevented atherosclerosis could improve long-term graft patency and clinical outcomes. We used a rabbit model of jugular vein-to-carotid interposition grafting to develop gene therapy for vein-graft atherosclerosis. Rabbit veins were easily transduced in situ with a first-generation adenoviral vector; however, most transgene expression (?80%) was lost within 3 days after arterial grafting. This rapid loss of transgene expression was not prevented by transducing veins after grafting or by prolonged ex vivo transduction. However, delaying vein-graft transduction for 28 days (after the vein had adapted to the arterial circulation) prevented this early loss of transgene expression. We used the delayed transduction approach to test the durability of expression of a therapeutic transgene (apolipoprotein A-I) expressed from a helper-dependent adenoviral (HDAd) vector. HDAd DNA and apolipoprotein A-I mRNA were easily detectable in transduced vein grafts. Vector DNA and mRNA declined by 4 weeks, and then persisted stably for at least 6 months. Delaying transduction for 28 days after grafting permitted initiation of vein-graft neointimal growth and medial thickening before gene transfer. However, vein-graft lumen diameter was not compromised, because of gradual outward remodeling of grafted veins. Our data highlight the promise of HDAd-mediated gene therapy, delivered to arterialized vein grafts, for preventing vein-graft atherosclerosis. PMID:25383597

Du, Liang; Zhang, Jingwan; Clowes, Alexander W; Dichek, David A

2015-01-01

329

Alkali-feldspathic material entrained in Fe,S-rich veins in a monomict ureilite  

Microsoft Academic Search

The Elephant Moraine (EET) 96001 ureilite contains a remarkable diversity of feldspars, which occur as tiny (no more than 60 mum maximum dimension) grains within a few Fe,S-rich (now weathered to mostly Fe oxide) veins. Molar S:Fe ratio in the veins averages 0.08 ± 0.02. The veins meander and feature large fluctuations in apparent width; they appear to have entered

Paul H. Warren; Heinz Huber; Finn Ulff-Møller

2006-01-01

330

Novel Balloon Catheter Technologies for Pulmonary Vein\\/Antrum Isolation  

Microsoft Academic Search

\\u000a We describe novel balloon catheter technologies for pulmonary vein (PV)\\/antrum isolation using three different energy sources\\u000a (high-intensity focused ultrasound, laser energy and cryothermia). 1) A High-intensity focused ultrasound (HIFU) balloon catheter\\u000a is designed to focus HIFU energy circumferentially outside the PV (PV antrum). The catheter has two non-compliant balloons\\u000a and a 9MHz ultrasound crystal is located with the distal bal

Hiroshi Nakagawa; Katsuaki Yokoyama; Hiroshi Aoyama; Sara Foresti; Jan V. Pitha; Ralph Lazzara; Andrea Natale; Warren M. Jackman

331

Treatment of symptomatic pelvic varices by ovarian vein embolization  

Microsoft Academic Search

Purpose  Pelvic congestion syndrome is a common cause of chronic pelvic pain in women and its association with venous congestion has\\u000a been described in the literature. We evaluated the potential benefits of lumboovarian vein embolization in the treatment of\\u000a lower abdominal pain in patients presenting with pelvic varicosities.\\u000a \\u000a \\u000a \\u000a Methods  Nineteen patients were treated. There were 13 unilateral embolizations, 6 initial bilateral treatments

Patrizio Capasso; Christine Simons; Geneviève Trotteur; Robert F. Dondelinger; Denis Henroteaux; Ulysse Gaspard

1997-01-01

332

Occlusion of both caval veins by an endovascular occluder.  

PubMed

Minimally invasive surgery (MIS) for redo mitral/tricuspidal surgery is going to increase, offering good results for early and late mortality and morbidity. In a case of redo surgery through a right thoracotomy (RT), when tricuspid surgery is planned, the superior (SVC) and inferior caval veins (IVC) are usually isolated and snared in order to prevent air embolism and significant blood regurgitation. We describe our experience in eight redo patients, operated for combined mitral/tricuspid or isolated tricuspid surgery, where the endovascular occlusion of the SVC and IVC was obtained by means of an endovascular occluder (Equalizer). PMID:22465589

Sansone, Fabrizio; Barbero, Cristina; Rinaldi, Mauro

2012-05-01

333

Proximal lower limb vein thrombosis following vipera berus hand bite.  

PubMed

Vipera berus has a wide geographical distribution throughout Central and Northern Europe. The symptoms after a bite usually are mild, life threatening symptoms are mainly described in children. We describe a case of popliteal vein thrombosis of the right leg after systemic envenoming with Vipera berus venom after a bite in the right hand by a female Vipera berus in the alpine region of Styria, Austria. Changes of the plasmatic coagulation system were obvious in our patient. These changes were due to an activation of the coagulation system and might be the reason for the thrombotic event in this usually healthy young male person. PMID:20464679

Gary, T; Prüller, F; Froehlich, H; Werner, S; Hafner, F; Brodmann, M

2010-05-01

334

Divided Saphenectomy for Varicose Vein in Ambulatory Surgery  

PubMed Central

We performed divided saphenectomy (DS) for varicose vein in ambulatory surgery with minimal incisions. Under tumescent local anesthesia, this procedure ligates all perforators in the thigh, preserving a route of venous drainage, and reduces bruising by ligating all tributaries. Also, DS does not need any special surgical instrument. Subcutaneous inguinal hemorrhage was observed in 4.9% (3/61), mild bruises were observed in 19.7% (12/61), and saphenous nerve neuralgia was 1.6% (1/61). Wound infection, deep venous thrombosis, and edema were not observed. DS is a minimally invasive, simple, and cost-effective procedure. PMID:24995071

2014-01-01

335

Alteration and vein mineralization, Schwartzwalder uranium deposit, Front Range, Colorado  

USGS Publications Warehouse

The Schwartzwalder uranium deposit, in the Front Range west of Denver, Colorado, is the largest vein-type uranium deposit in the United States. The deposit is situated in a steeply dipping fault system that cuts Proterozoic metamorphic rocks. The host rocks represent a submarine volcanic system with associated chert and iron- and sulfide-rich pelitic rocks. Where faulted, the more competent garnetiferous and quartzitic units behaved brittlely and created a deep, narrow conduit. The ores formed 70-72 m.y. ago beneath 3 km of Phanerozoic sedimentary rocks. Mineralization included two episodes of alteration and three stages of vein-mineralization. Early carbonate-sericite alteration pseudomorphically replaced mafic minerals, whereas the ensuing hematite-adularia episode replaced only the earlier alteration assemblage. Early vein mineralization produced a minor sulfide-adularia-carbonate assemblage. Later vein mineralization generated the uranium ores in two successive stages. Carbonates, sulfides, and adularia filled the remaining voids. Clastic dikes composed of fault gouge and, locally, ore were injected into new and existing fractures. Geologic and chemical evidence suggest that virtually all components of the deposit were derived from major hornblende gneiss units and related rocks. The initial fluids were evolved connate/metamorphic water that infiltrated and resided along the extensive fault zones. Complex fault movements in the frontal zone of the eastern Front Range caused the fluids to migrate to the most permeable segments of the fault zones. Heat was supplied by increased crustal heat flow related to igneous activity in the nearby Colorado mineral belt. Temperatures decreased from 225?C to 125?C during later mineralization, and the pressure episodically dropped from 1000 bars. The CO2 fugacity was initially near 100 bars, and uranium was carried as a dicarbonate complex. Sudden decreases in confining pressure during fault movement caused evolution of CO2 and a consequent increase in pH. Uranium was released with destruction of the uranyl complexes; it was subsequently reduced by aqueous sulfur species, thereby leading to the precipitation of pitchblende.

Wallace, Alan R.

1983-01-01

336

[Radiographic anatomy of the inferior azygos system, the ovarian and spermatic veins].  

PubMed

The spermatic vein is tributary at the right of the infra-renal cava mainstem and at the left of the renal vein. It is fitted with an ostium or pre-ostium valvula which is normally tight. In the broad ligament of the uterus, the ovarian vein exchanges plexiform anastomosi with the homolateral or contralateral uterine vein through pre- or retro-uterine arches. The spermatic or ovarian reflux is more frequent on the left. Retrograde venography under cava occlusion is a good means to explore these vessels. The big Azygous vein joins the sub-renal vena cava by two roots. The internal root, which is often slender, perforates vertically the dialitic membrane. The external root, bigger, is the vein in L2; the lateral part of its track takes place in the psoas where it gains veins proceeding from the foramina of the adjacent conjugations. On the left side, the roots of the hemi-Azygos appear most frequently in the left-renal vein. There may be a single root: the external root is the Lejars' arch. The variations of the derivative cavo-cava system represented by the Azygos veins are studied on the anatomical plan. Pathological literature complements this study. PMID:8248303

Gillot, C

1993-01-01

337

Association of a distinct strain of hollyhock yellow vein mosaic virus and Ludwigia leaf distortion betasatellite with yellow vein mosaic disease of hollyhock (Alcea rosea) in India.  

PubMed

A distinct strain of hollyhock yellow vein mosaic virus (HoYVMV) and Ludwigia leaf distortion betasatellite (LuLDB) were associated with yellow vein mosaic of hollyhock. The viral DNA genome (JQ911766) and betasatellite (JQ408216) shared highest nucleotide sequence identity (89.2 %) with HoYVMV (the only available sequence in GenBank) and 92 % identity with LuLDB. Agroinfiltration of HoYVMV and LuLDB induced yellow vein mosaic symptoms on hollyhock, thereby demonstrating causality of the disease. PMID:24810100

Srivastava, A; Kumar, S; Raj, S K; Pande, S S

2014-10-01

338

Arteries are formed by vein-derived endothelial tip cells.  

PubMed

Tissue vascularization entails the formation of a blood vessel plexus, which remodels into arteries and veins. Here we show, by using time-lapse imaging of zebrafish fin regeneration and genetic lineage tracing of endothelial cells in the mouse retina, that vein-derived endothelial tip cells contribute to emerging arteries. Our movies uncover that arterial-fated tip cells change migration direction and migrate backwards within the expanding vascular plexus. This behaviour critically depends on chemokine receptor cxcr4a function. We show that the relevant Cxcr4a ligand Cxcl12a selectively accumulates in newly forming bone tissue even when ubiquitously overexpressed, pointing towards a tissue-intrinsic mode of chemokine gradient formation. Furthermore, we find that cxcr4a mutant cells can contribute to developing arteries when in association with wild-type cells, suggesting collective migration of endothelial cells. Together, our findings reveal specific cell migratory behaviours in the developing blood vessel plexus and uncover a conserved mode of artery formation. PMID:25502622

Xu, Cong; Hasan, Sana S; Schmidt, Inga; Rocha, Susana F; Pitulescu, Mara E; Bussmann, Jeroen; Meyen, Dana; Raz, Erez; Adams, Ralf H; Siekmann, Arndt F

2014-01-01

339

Inorganic phosphate inhibits sympathetic neurotransmission in canine saphenous veins  

SciTech Connect

Inorganic phosphate has been proposed as the initiator of metabolic vasodilatation in active skeletal muscle. The present study was primarily designed to determine if this substance has an inhibitory effect on adrenergic neurotransmission. Rings of canine saphenous veins were suspended for isometric tension recording in organ chambers. A comparison was made of the ability of inorganic phosphate (3 to 14 mM) to relax rings contracted to the same degree by electrical stimulation, exogenous norepinephrine, and prostaglandin F/sub 2..cap alpha../. The relaxation during electrical stimulation was significantly greater at all concentrations of phosphate. In strips of saphenous veins previously incubated with (/sup 3/H)norepinephrine, the depression of the contractile response caused by phosphate during electrical stimulated was accompanied by a significant reduction in the overflow of labeled neurotransmitter. Thus inorganic phosphate inhibits sympathetic neurotransmission and hence may have a key role in the sympatholysis in the active skeletal muscles during exercise. By contrast, in this preparation, it has a modest direct relaxing action on the vascular smooth muscle.

Edoute, Y.; Vanhoutte, P.M.; Shepherd, J.T.

1987-01-01

340

Canalization-based vein formation in a growing leaf.  

PubMed

Vein formation is an important process in plant leaf development. The phytohormone auxin is known as the most important molecule for the control of venation patterning; and the canalization model, in which cells experiencing higher auxin flux differentiate into specific cells for auxin transportation, is widely accepted. To date, several mathematical models based on the canalization hypothesis have been proposed that have succeeded in reproducing vein patterns similar to those observed in actual leaves. However, most previous studies focused on patterning in fixed domains, and, in a few exceptional studies, limited tissue growth - such as cell proliferation at leaf margins and small deformations without large changes in cell number - were dealt with. Considering that, in actual leaf development, venation patterning occurs in an exponentially growing tissue, whether the canalization hypothesis still applies is an important issue to be addressed. In this study, we first show through a pilot simulation that the coupling of chemical dynamics for canalization and tissue growth as independent models cannot reproduce normal venation patterning. We then examine conditions sufficient for achieving normal patterning in a growing leaf by introducing various constraints on chemical dynamics, tissue growth, and cell mechanics; in doing so, we found that auxin flux- or differentiation-dependent modification of the cell cycle and elasticity of cell edges are essential. The predictions given by our simulation study will serve as guideposts in experiments aimed at finding the key factors for achieving normal venation patterning in developing plant leaves. PMID:24632445

Lee, Sang-Woo; Feugier, Francois Gabriel; Morishita, Yoshihiro

2014-07-21

341

Glass Veins in the Unequilibrated Eucrite Yamato 82202  

NASA Technical Reports Server (NTRS)

The unequilibrated eucrite Yamato 82202 (Y82202) contains a network of glass veins, which are relatively thick (up to 1 mm in width) and are not devitrified. The host of the meteorite represents volcanic rock that crystallized >4.3 Gyr ago, probably as a lava flow on the surface of 4 Vesta. The impact event that formed the glass veins occurred at approx. 3.9 Gyr under conditions of low effective fo2 and very rapid cooling. A S-rich vapor probably was generated by impact vaporization of sulfides. The impact melt was not superheated and it retains some disordered structural characteristics of the original pyroxene and feldspar of the eucritic target lithology. The unequilibrated pyroxenes of this eucrite and the pristine character of the glass indicate that the meteorite experienced no significant metamorphism after initial crystallization. Hence, it was not buried to a significant depth or covered by a lava flow or hot layer of impact ejecta. The meteorite resided at a shallow level (though not at the surface) on 4 Vesta or on one of the vestoids until it was ejected and traveled to Earth, probably with other HED materials that have Ar-36 exposure ages of approx. 13 Myr.

Bogard, Donald; Buchanan, Paul; Noguchi, T.; Katavama, Ikuo

2004-01-01

342

Arteries are formed by vein-derived endothelial tip cells  

PubMed Central

Tissue vascularization entails the formation of a blood vessel plexus, which remodels into arteries and veins. Here we show, by using time-lapse imaging of zebrafish fin regeneration and genetic lineage tracing of endothelial cells in the mouse retina, that vein-derived endothelial tip cells contribute to emerging arteries. Our movies uncover that arterial-fated tip cells change migration direction and migrate backwards within the expanding vascular plexus. This behaviour critically depends on chemokine receptor cxcr4a function. We show that the relevant Cxcr4a ligand Cxcl12a selectively accumulates in newly forming bone tissue even when ubiquitously overexpressed, pointing towards a tissue-intrinsic mode of chemokine gradient formation. Furthermore, we find that cxcr4a mutant cells can contribute to developing arteries when in association with wild-type cells, suggesting collective migration of endothelial cells. Together, our findings reveal specific cell migratory behaviours in the developing blood vessel plexus and uncover a conserved mode of artery formation. PMID:25502622

Xu, Cong; Hasan, Sana S.; Schmidt, Inga; Rocha, Susana F.; Pitulescu, Mara E.; Bussmann, Jeroen; Meyen, Dana; Raz, Erez; Adams, Ralf H.; Siekmann, Arndt F.

2014-01-01

343

Diameter, pressure and compliance relationships in dorsal hand veins.  

PubMed

The diameter-pressure characteristics of dorsal hand veins previously have not been characterized. In this study, the effects of distending pressure with and without infused norepinephrine on diameter and compliance were observed. The elevation needed for venous collapse was measured, and the effects of baseline constriction on venous reactivity were assessed. In seven supine subjects, a brachial cuff on an elevated arm was used to generate distending pressures while a linear variable displacement transformer (LVDT) measured changes in venous diameter. Arctangent functions of distending pressure were fitted to the normalized diameter, then compliance functions were calculated. In supine subjects, 5-15 cm of elevation emptied dorsal hand veins. Norepinephrine decreased the venous diameter at any distending pressure by increasing the P50 without significantly changing the midpoint slope. Compliance was a nearly single-valued function of the normalized diameter with a maximum value at about 60% distention. Reactivity depends on distending pressure and baseline P50. Percentage constriction is a function of initial and final P50 and of distending pressure. PMID:11530971

Shykoff, B E; Hawari, F I; Izzo, J L

2001-01-01

344

Effective management of acute deep vein thrombosis: direct oral anticoagulants.  

PubMed

Deep vein thrombosis (DVT) is a manifestation of venous thromboembolism (VTE) and accounts for most venous thromboembolic events. Although DVT is not directly life-threatening, thrombi in the proximal veins of the leg can embolize to the lungs to form a pulmonary embolism, which may prove rapidly fatal. If untreated, DVT can also lead to significant morbidity, including development of post-thrombotic syndrome. Among many risk factors, surgery, hospitalization, older age and active cancer increase the risk of VTE, and a previous event increases the risk of recurrence. Early detection and effective clot resolution are vital in managing DVT. Conventional approaches to acute treatment of VTE involve initial fast-acting parenteral heparin overlapping with and followed by vitamin K antagonist therapy. However, vitamin K antagonists have a narrow therapeutic window, require regular monitoring, and have multiple food and drug interactions. Results from phase III clinical studies involving direct Factor Xa and IIa inhibitors suggest that these agents provide an alternative therapeutic option that overcomes some of the complications associated with conventional treatment with predictable pharmacological properties and convenient dosing schedules. Analysis of data from the rivaroxaban EINSTEIN studies also suggests that these agents have the potential to improve patient-reported treatment satisfaction and reduce the length of hospital stay compared with conventional therapy. This review considers these treatment options, suitable treatment durations to prevent recurrence, and the management of DVT treatment in challenging patient groups. PMID:24927023

Roussin, A

2015-02-01

345

A method for quickly and exactly extracting hepatic vein  

NASA Astrophysics Data System (ADS)

It is of vital importance that providing detailed and accurate information about hepatic vein (HV) for liver surgery planning, such as pre-operative planning of living donor liver transplantation (LDLT). Due to the different blood flow rate of intra-hepatic vascular systems and the restrictions of CT scan, it is common that HV and hepatic portal vein (HPV) are both filled with contrast medium during the scan and in high intensity in the hepatic venous phase images. As a result, the HV segmentation result obtained from the hepatic venous phase images is always contaminated by HPV which makes accurate HV modeling difficult. In this paper, we proposed a method for quick and accurate HV extraction. Based on the topological structure of intra-hepatic vessels, we analyzed the anatomical features of HV and HPV. According to the analysis, three conditions were presented to identify the nodes that connect HV with HPV in the topological structure, and thus to distinguish HV from HPV. The method costs less than one minute to extract HV and provides a correct and detailed HV model even with variations in vessels. Evaluated by two experienced radiologists, the accuracy of the HV model obtained from our method is over 97%. In the following work, we will extend our work to a comprehensive clinical evaluation and apply this method to actual LDLT surgical planning.

Xiong, Qing; Yuan, Rong; Wang, Luyao; Wang, Yanchun; Li, Zhen; Hu, Daoyu; Xie, Qingguo

2013-02-01

346

Technique of pulmonary vein isolation by catheter ablation  

PubMed Central

In selected patients with atrial fibrillation, the fibrillation episodes may be initiated by single or short bursts of ectopy often originating from one or more pulmonary veins (PVs). Therefore, electrical isolation of these veins by catheter ablation is currently being explored as a treatment modality for patients with paroxysmal and even more permanent types of atrial fibrillation. At present, two different techniques are used: 1) selective ablation of electrical connections between left atrium and myocardial sleeves inside the PVs; and 2) contiguous encircling lesions around and outside the PV ostia. With both techniques, moderate to high success rates have been reported with a limited follow-up duration. Both types of procedure are very complex and require a highly skilful team. With the variable anatomy of the PVs, non-invasively acquired angiographic images may serve as a roadmap for catheter manipulation. Modern three-dimensional catheter navigation techniques can be applied to facilitate accurate catheter positioning with limited fluoroscopic exposure. Experimental and clinical research is needed to define patient selection criteria. ImagesFigure 2Figures 3 and 4Figure 5

Wittkampf, F.H.M.; Derksen, R.; Wever, E.F.D.; Simmers, T.A.; Boersma, L.V.A.; Vonken, E.P.A.; Velthuis, B.K.; Sreeram, N.; Rensing, B.J.; Cramer, M.J.

2002-01-01

347

Numerical modelling of the formation of fibrous bedding-parallel veins  

NASA Astrophysics Data System (ADS)

Bedding-parallel veins with a fibrous infill oriented orthogonal to the vein wall, are often observed in fine-grained metasedimentary sequences. Several mechanisms have been proposed for their formation, mostly with respect to effects of fluid overpressures and anisotropy of the host-rock fabric in order to explain the inferred extensional failure with sub-vertical opening. Abundant pre-folding, bedding-parallel fibrous dolomite veins are found associated with the Nkana-Mindola stratiform Cu-Co deposit in Zambia. The goal of this study is to better understand the formation mechanisms of these veins and to explain their particular spatial and thickness distribution, with respect to failure of transversely isotropic rocks. The spatial distribution and thickness variation of these veins was quantified during a field campaign in thirteen line transects perpendicular to undeformed veins in underground crosscuts. The fibrous dolomite veins studied are not related to lithological contrasts, but to a strong bedding-parallel shaly fabric, typical for the black shale facies of the Copperbelt Orebody Member. The host rock can hence be considered as transversely isotropic. Growth morphologies vary from antitaxial with a pronounced median surface to asymmetric syntaxial, always with small but quantifiable growth competition. A microstructural fabric study reveals that the undeformed dolomite veins show low-tortuosity vein walls and quantifiable growth competition. Here, we use a Discrete Element Method numerical modelling approach with ESyS-Particle (http://launchpad.net/esys-particle) to simulate the observed properties of the veins. Calibrated numerical specimens with a transversely isotropic matrix are repeatedly brought to failure under constant strain rates by changing the effective strain rates at model boundaries. After each fracture event, fractures in the numerical model are filled with cohesive vein material and the experiment is repeated. By systematically varying stress states, fluid pressures and mechanical properties of materials (host rock, vein infill and interface), we attempt to reproduce the characteristics of spatial distribution and thickness variation of the veins. Four parameter sets of mechanical micro-properties are defined in the models, essentially yielding (1) a competent and (2) incompetent matrix, (3) a vein material and (4) a vein-matrix interface. Each combination of parameters and particle packings is calibrated to fit a predetermined Mohr-Coulomb type failure envelope, via an automated calibration procedure. Preliminary tests already show that by varying these parameters, we are able to simulate realistically distributed cracking through crack-seal processes. Different types of veins and vein generations can be modelled, ranging from single veins, over crack-seal veins to anastomosing veins, by varying the mechanical strength of competent and incompetent matrix, vein and interface material. Further results of this approach will be presented. We will discuss our results with respect to mechanisms proposed in the literature for bedding-parallel, fibrous veins in metasedimentary rock sequences.

Torremans, Koen; Muchez, Philippe; Sintubin, Manuel

2014-05-01

348

Uranium-series age determination of calcite veins, VC-1 drill core, Valles Caldera, New Mexico  

NASA Astrophysics Data System (ADS)

Uranium-series analysis (238U-234U-230Th) of 13 calcite veins from the hydrothermally altered Madera Limestone in the VC-1 drill core was performed to determine the ages of the veins and their relation to the Valles hydrothermal system. Thermal water from VC-1 and two hot springs in San Diego Canyon was analyzed for U and (234U/238U) to help evaluate the constancy of initial (234U/238U). The (230Th/234U) age of one of the veins is ˜95 kyr, and those of two other veins are ˜230 and ˜250 kyr. Five of the veins have near equilibrium (230Th/234U) and are probably older than ˜0.3 m.y. Uranium concentrations in the remaining veins are too low for analysis by the ?-spectrometry techniques employed in this study. Of the five veins near (230Th/234U) equilibrium, four are also near (234U/238U) equilibrium, suggesting ages greater than ˜1.0 m.y., but one has (234U/238U) = 1.15, suggesting an age between ˜0.3 and ˜1.0 m.y. Calculated initial (234U/238U) of the veins yielding relatively young ages are neither equal to each other nor to (234U/238U) in thermal water from VC-1, indicating inconstancy of initial (234U/238U) that may be related to variations in groundwater mixing proportions. Three of the four veins that yield relatively young ages consist of coarse, sparry, vuggy calcite, suggesting that this may be the type of calcite vein which forms under conditions resembling those encountered presently in VC-1. The analytical data are consistent with closed-system behavior of U and Th in the VC-1 calcite veins.

Sturchio, Neil C.; Binz, Carl M.

1988-06-01

349

Genetic variation for big-vein symptom expression and resistance to Mirafiori lettuce big-vein virus in Lactuca virosa L., a wild relative of cultivated lettuce  

Microsoft Academic Search

Lactuca virosa L. is a wild relative of lettuce that is potentially an important source of resistance to big-vein disease, an economically\\u000a damaging disease of lettuce. Identification of L. virosa accessions with resistance to Mirafiori lettuce big-vein virus (MLBVV), the disease causing agent, may be useful for lettuce breeding. The objectives of this research were to determine\\u000a the genetic variation

Ryan J. Hayes; Edward J. Ryder; William M. Wintermantel

2008-01-01

350

Creation of secondary AV fistulas from failed hemodialysis grafts: the role of routine vein mapping  

Microsoft Academic Search

Pre-existing forearm grafts lead to dilatation of upper arm veins of the ipsilateral arm that greatly fa- cilitates the creation of secondary arteriovenous fistulas (AVF). In this retrospective review of 18 patients, the routine and periodical revision of failed grafts were discontinued. Vein mapping by physical examination or Du- plex studies was performed prior to graft failure and a secondary

V. D. NGUYEN; L. TREAT; C. GRIFFITH; K. ROBINSON

351

Squash vein yellowing virus, a novel ipomovirus, isolated from squash and watermelon in Florida  

Technology Transfer Automated Retrieval System (TEKTRAN)

A novel whitefly-transmitted member of the family Potyviridae was isolated from a squash plant (Cucurbita pepo) with vein yellowing symptoms in Florida. The virus, for which the name Squash vein yellowing virus (SqVYV) is proposed, has flexuous rod-shaped particles of ~840 nm in length. SqVYV was ...

352

Pancreatitis-associated splenic vein thrombosis with intrasplenic venous thrombosis: a case report  

Microsoft Academic Search

Splenic vein thrombosis most often results from pancreatic disease and can result in gastrointestinal bleeding due to gastric\\u000a varices. The diagnosis is becoming more frequent with the increasing utilization of imaging. This case report will review\\u000a the imaging findings of splenic vein thrombosis with an illustration of the involvement of intrasplenic segmental venous branches.

Stephanie A. Schwartz; Alana Y. Stubbs; Mihra S. Taljanovic; Stephen H. Smyth

2008-01-01

353

Two-Stage Portal Vein Ligation Facilitates Liver Regeneration in Rats  

Microsoft Academic Search

Background\\/Aims: Recent reports have demonstrated that some patients are unable to undergo scheduled liver resection after preoperative portal vein embolization due to insufficient hypertrophy of the future remnant liver. The present study examined whether two-stage portal vein ligation (PVL) increases hypertrophy of the future remnant liver compared to conventional PVL in rats. Methods: Rats were divided into 3 groups: group

T. Sugimoto; T. Yamada; H. Iwata; T. Sekino; S. Matsumoto; N. Ishida; H. Manabe; M. Kimura; H. Takemura

2009-01-01

354

Expression and significance of NELIN and SM22? in varicose vein tissue  

PubMed Central

The aim of the present study was to investigate the expression of NELIN and SM22? in lower extremity varicose vein tissue, and their association with varicose veins. Tissue samples were collected from 18 patients with lower extremity varicose veins for the experimental group, while normal great saphenous vein tissue was reserved during coronary artery bypass surgery from 14 patients for the controls. Reverse transcription polymerase chain reaction (RT-PCR) analysis was applied to detect the mRNA expression levels of NELIN and SM22?, while immunohistochemical techniques were used to detect the protein expression levels in the normal and abnormal veins. RT-PCR results revealed that the mRNA expression levels of NELIN and SM22? in the experimental group decreased significantly when compared with the control group (P<0.01). In the two groups, immunohistochemical staining demonstrated that NELIN and SM22? were primarily expressed in the cytoplasm of smooth muscle cells, and the expression quantity decreased significantly in the experimental group when compared with the control group (P<0.05). The low expression of SM22? in the primary lower limb varicose vein tissue indicated that the vascular smooth muscle cell layer had transformed from a contractile to a secretory phenotype, which may have resulted in the remodeling of the vein walls and the occurrence of varicose veins. Therefore, NELIN and SM22? were demonstrated to play a key role in the development of varicosity.

CHEN, SHIHUI; QIN, SHIYONG; WANG, MINGHAI; ZHANG, SHUGUANG

2015-01-01

355

Duplex-derived Evidence of Reflux After Varicose Vein Surgery: Neoreflux or Neovascularisation?  

Microsoft Academic Search

Backgroundrecurrent varicose veins remain a problem in surgical practice despite improvements to the preoperative investigation of, and surgery for varicose veins. Neovascularisation accounts for some cases of recurrence within a few years of surgery, but other factors relating to disease progression must also play a part. We investigated whether new venous reflux (neoreflux) could occur in the early postoperative period

E. P. L Turton; D. J. A Scott; S. P Richards; M. J Weston; D. C Berridge; P. J Kent; R. C Kester

1999-01-01

356

Expansive remodeling in venous bypass grafts: Novel implications for vein graft disease  

Microsoft Academic Search

ObjectiveTo date, intimal hyperplasia has been regarded as the principle mechanism responsible for subsequent vein graft disease. Lumen remodeling has not been previously considered as an additional mechanism. The objectives of this study were to determine changes in lumen remodeling in arterialized vein grafts, the accompanying cellular and extracellular matrix events contributing to remodeling, and the effects of a high

Amy P. Wong; Nafiseh Nili; Zane S. Jackson; Beiping Qiang; Howard Leong-Poi; Ronen Jaffe; Ehud Raanani; Philip W. Connelly; John D. Sparkes; Bradley H. Strauss

2008-01-01

357

Early Effects of Arterial Hemodynamic Conditions on Human Saphenous Veins Perfused Ex Vivo  

E-print Network

to promote vein graft remodeling are surgical preparation injury and exposure to the arterial hemodynamicEarly Effects of Arterial Hemodynamic Conditions on Human Saphenous Veins Perfused Ex Vivo Kreton--Exposure to the arterial hemodynamic environment is thought to be a potential trigger for the pathological remodeling

Chesler, Naomi C.

358

The Investigation on Fibrous Veins and Their Host from Mt. Ida, Ouachita Mountains, Arkansas  

E-print Network

I have studied syntectonic veins from shales and coarse calcareous sands of the Ordovician Womble Shale, Benton uplift, Arkansas. All veins are composed of calcite with minor quartz and trace feldspar and dolomite or high-Mg calcite in the coarser...

Chung, Jae Won

2004-09-30

359

Transjugular intrahepatic portosystemic shunt for palliative treatment of portal hypertension secondary to portal vein tumor thrombosis  

Microsoft Academic Search

AIM: To evaluate the palliative therapeutic effects of transjugular intrahepatic portosystemic shunt (TIPS) in portal vein tumor thrombosis (PVTT) complicated by portal hypertension. METHODS: We performed TIPS for 14 patients with PVTT due to hepatocellular carcinoma (HCC). Of the 14 patients, 8 patients had complete occlusion of the main portal vein, 6 patients had incomplete thrombosis, and 5 patients had

Zai-Bo Jiang; Hong Shan; Xin-Ying Shen; Ming-Sheng Huang; Zheng-Ran Li; Kang-Shun Zhu; Shou-Hai Guan

360

Duplex Ultrasonography for the Detection of Deep Vein Thrombi After Total Hip or Knee Arthroplasty  

Microsoft Academic Search

The usefulness of real-time duplex ultrasonography (DU) as a screening test for deep vein thrombosis (DVT) in high-risk patients remains uncertain. To determine the sensitivity and specificity of DU for the detection of DVT, the authors prospectively studied 178 consecutive patients after total hip (n=113) or total knee (n = 66) arthroplasty. The deep veins from the inguinal ligament to

C. Gregory Elliott; Mary Suchyta; Steven C. Rose; Steve Talbot; Clynn Ford; Gary Raskob; Russell Hull; Bruce Davidson

1993-01-01

361

Radioembolization After Portal Vein Embolization in a Patient with Multifocal Hepatocellular Carcinoma  

SciTech Connect

Radioembolization is an effective locoregional therapy for patients with intermediate or advanced stage hepatocellular carcinoma (HCC). It has been shown that radioembolization is safe in patients with portal vein thrombosis. This case report describes safe radioembolization after portal vein embolization in a patient with multifocal HCC.

Burgmans, Mark C., E-mail: mburgmans@hotmail.com; Irani, Farah G., E-mail: farah.gillan.irani@sgh.com.sg; Chan, Wan Ying, E-mail: chanwanying01@gmail.com; Teo, Terence K., E-mail: teo.kiat.beng@sgh.com.sg [Singapore General Hospital, Department of Diagnostic Radiology, Interventional Radiology Center (Singapore); Kao, Yung Hsiang, E-mail: yung.h.kao@gmail.com; Goh, Anthony S.W., E-mail: anthony.goh.s.w@sgh.com.sg [Singapore General Hospital, Department of Nuclear Medicine and PET (Singapore); Chow, Pierce K., E-mail: pierce.chow@duke-nus.edu.sg [Singapore General Hospital, Department of General Surgery (Singapore); Lo, Richard H., E-mail: richard.lo.h.g@sgh.com.sg [Singapore General Hospital, Department of Diagnostic Radiology, Interventional Radiology Center (Singapore)

2012-12-15

362

Rex shunt for portal vein thrombosis after adult living donor liver transplantation.  

PubMed

Portal vein thrombosis (PVT) after liver transplantation is a relatively common but serious complication which could lead to portal hypertension or a direct graft loss. A "Rex" shunt created between the superior mesenteric vein (SMV) and the umbilical portion of the left portal vein can be a useful option to treat PVT after pediatric liver transplantation, however, its application to adult patients has not been reported so far because appropriate vein grafts are hardly available. Herein we present a case of PVT after left lobe living donor liver transplantation (LDLT) who underwent the procedure using the own inferior jugular vein and the gonadal vein as a shunt graft. The shunt was patent immediately after the procedure but was thrombosed 2 days after probably due to the insufficient inflow from the SMV and the absence of anticoagulation therapy, for which emergent thrombectomy and ligation of the significant hepatofugal collateral veins followed by full anti-coagulation therapy were performed. The shunt remains open at 8 month after the procedure with a normal anmonia level and liver function. In conclusion, the Rex shunt using recipient's autologous vein grafts is a feasible and valuable option for adult patients to treat PVT after LDLT. PMID:24620643

Soejima, Yuji; Shirabe, Ken; Yoshizumi, Tomoharu; Uchiyama, Hideaki; Ikegami, Toru; Yamashita, Yo-Ichi; Ikeda, Tetsuo; Kawanaka, Hirofumi; Sugimachi, Keishi; Mimori, Koshi; Watanabe, Masayuki; Morita, Masaru; Oki, Eiji; Saeki, Hiroshi; Maehara, Yoshihiko

2013-11-01

363

Hydrothermal Alteration and Mineralization Zoning in Iron-Oxide(-Cu-Au) Vein Deposits, near Copiap, Chile  

E-print Network

as a function of structural levels. Two vein systems hosted in La Brea diorite phase of the Copiapó batholith vein formed near the upper contact of the host La Brea diorite. Few IOCG systems have well documented and Sollner, 2006; M.D. Barton et al., unpubl. data). The plutons are broadly dioritic in composition

Barton, Mark D.

364

An extremely rare complication of varicose vein surgery: retained foreign body.  

PubMed

Foreign body is among complications of surgery. But as a complication of varicose vein surgery it was reported extremely rarely and, to our knowledge, there is only one paper in the literature. A case with retained sponge which was detected five months after varicose vein surgery was presented. PMID:25431729

F?nd?k, Orhan; Ayd?n, Ufuk; Düzyol, Ca?r?; Bar??, Ozgür; Koço?ullar?, Cevdet U?ur

2014-01-01

365

An Extremely Rare Complication of Varicose Vein Surgery: Retained Foreign Body  

PubMed Central

Foreign body is among complications of surgery. But as a complication of varicose vein surgery it was reported extremely rarely and, to our knowledge, there is only one paper in the literature. A case with retained sponge which was detected five months after varicose vein surgery was presented. PMID:25431729

F?nd?k, Orhan; Ayd?n, Ufuk; Düzyol, Ça?r?; Bar??, Özgür; Koço?ullar?, Cevdet U?ur

2014-01-01

366

Role of the Calpain System in Pulmonary Vein Connexin Remodeling in Dogs with Atrial Fibrillation  

Microsoft Academic Search

Objectives: Changes in connexins and calpains of the myocardial sleeve of the pulmonary vein and the left atrium were investigated in chronic atrial fibrillation (AF) animal models. Background: There are no reports of changes in the calpain system and connexins in the pulmonary vein where AF is initiated. Methods: An AF animal model was prepared by rapid pacing of the

Wei Zhang; Xiao Ma; Ming Zhong; Zhaotong Zheng; Li Li; Zhihao Wang; Yun Zhang

2009-01-01

367

Heterogeneity of propagation of excitation in epicardium of pulmonary veins ostia in rabbit during cooling  

Microsoft Academic Search

O Obbjjeeccttiivvee:: The purpose of this research was to study the propagation of the excitation wave along epicardium in the area of the pulmonary veins ostia in rabbit in normal conditions and while cooling. M Meetthhooddss:: The excitation wave spreading along epicardium in the area of pulmonary veins ostia in the left atrium at 36-37 o C and when cooling

Svetlana L. Chudorodova; Irina M. Roshchevskaya; Mikhail P. Roshchevsky; Yao-Chang Chen; Yu-Jun Lai; Chen-I Lin

368

Gas Embolism Caused by Portal Vein Gas: Case Report and Literature Review  

Microsoft Academic Search

Introduction: We describe a case of pulmonary gas embolism caused by portal vein gas (PVG) observed using echocardiography. Echography revealed gas flowing through the hepatic vein, inferior vena cava, right atrium, and right ventricle, as well as pulmonary hypertension. The patient was diagnosed as having pulmonary gas embolism caused by PVG. Objective: We consider PVG routes to pulmonary circulation, diagnosis

Chiaki Kamikado; Shinjiro Nagano; Kouji Takumi; Terutoshi Senokuchi; Masaaki Kubo; Shinji Mitsue; Toshitaka Fukumoto; Shouji Natugoe; Takashi Aikou

2008-01-01

369

Current status of endoscopic vein harvest in cardiac and peripheral vascular surgery.  

PubMed

Endoscopic harvesting of the saphenous vein (EVH) has been shown to minimize the morbidity associated with saphenous vein harvest for either coronary artery bypass or lower extremity bypass. However, the long-term benefit of a bypass procedure is predicated on conduit patency. Several studies suggest decreased patency with EVH compared with open vein harvest. Possible reasons for this discrepancy have been investigated by microscopic, electron microscopic, and functional studies of venous endothelium and contractile function of harvested veins with conflicting results. This review details the results of these studies. In addition, the clinical results of coronary bypass graft and lower extremity bypass with open vein harvest and EVH are described in regard to early wound complications and short- and long-term patency. PMID:22418247

Dao, Kimberly; Malgor, Rafael D; Montecalvo, JoAnn; Hines, George

2012-01-01

370

Renal failure due to renal vein thrombosis in a fetus with growth restriction and thrombophilia.  

PubMed

We report a case of renal vein thrombosis diagnosed at 27 weeks of gestation in a dichorionic twin pregnancy. The left kidney of one fetus was hyperechoic and enlarged with echoic streaks following the direction of interlobular veins and the loss of corticomedullary differentiation. In the following weeks, left kidney became smaller and echoic, and Doppler examination showed no flow in both artery and vein. The right kidney had totally normal appearance in the beginning, but it became enlarged and hyperechoic, and progressed into a small echoic kidney with no flow in artery and vein. In the postnatal ultrasound examination, both kidneys appeared hyperechoic with no vascularization in the hilum region. There was thrombosis in arteries and veins of both kidneys, as well as in the inferior vena cava. The investigation for thrombophilia resulted with the combined presence of heterozygote mutation in factor V Leiden and prothrombin 20210 genes. PMID:24612313

Has, Recep; Corbacioglu Esmer, Aytul; Kalelioglu, Ibrahim H; Yumru, Harika; Yüksel, Atil; Ziylan, Orhan

2014-04-01

371

Finger-vein and fingerprint recognition based on a feature-level fusion method  

NASA Astrophysics Data System (ADS)

Multimodal biometrics based on the finger identification is a hot topic in recent years. In this paper, a novel fingerprint-vein based biometric method is proposed to improve the reliability and accuracy of the finger recognition system. First, the second order steerable filters are used here to enhance and extract the minutiae features of the fingerprint (FP) and finger-vein (FV). Second, the texture features of fingerprint and finger-vein are extracted by a bank of Gabor filter. Third, a new triangle-region fusion method is proposed to integrate all the fingerprint and finger-vein features in feature-level. Thus, the fusion features contain both the finger texture-information and the minutiae triangular geometry structure. Finally, experimental results performed on the self-constructed finger-vein and fingerprint databases are shown that the proposed method is reliable and precise in personal identification.

Yang, Jinfeng; Hong, Bofeng

2013-07-01

372

[The jugular vein system and its homologies in Latimeria chalmunae (Pisces, Crossopterygii, Coelacanthidae)].  

PubMed

The jugular vein of Latimeria is derived, as in actinopterygians and dipnoans, from two embryonic veins: the vena capitis medialis anteriorly and the vena capitalis lateralis posteriorly. It is continued caudally, until the Cuvieran duct, by the vena cardinalis anterior. With the enormous difference of growth between cranial box and brain, the cerebral veins have undergone important modifications. A very long antero-posterior shift exists between the origin and the ending of the anterior cerebral vein. In addition, the mid and posterior cerebral veins are transformed into big venous sinuses, which have lost, in the adult, almost any contact with the brain, impressed as they are against the wall of the posterior cranial cavity. PMID:810261

Robineau, D

1975-07-01

373

Portal Vein Delivery of Viral Vectors for Gene Therapy for Hemophilia  

PubMed Central

The liver is a very complex organ with a large variety of functions, making it an attractive organ for gene replacement therapy. Many genetic disorders can be corrected by delivering gene products directly into the liver using viral vectors. In this chapter, we will describe gene delivery via portal vein administration in mice and dogs to correct the blood coagulation disorder hemophilia B. Although there are multiple delivery routes for both viral and non-viral vectors in animals, portal vein administration delivers vectors directly and efficiently into the liver. Complete correction of murine hemophilia B and multi-year near-correction of canine hemophilia B have been achieved following portal vein delivery of adeno-associated viral (AAV) vectors expressing factor IX from hepatocyte-specific promoters. Peripheral vein injection can lead to increased vector dissemination to off-target organ such as the lung and spleen. Below, we will describe portal vein injection delivery route via laparotomy. PMID:24557919

Sherman, Alexandra; Schlachterman, Alexander; Cooper, Mario; Merricks, Elizabeth P.; Raymer, Robin A.; Bellinger, Dwight A.; Herzog, Roland W.; Nichols, Timothy C.

2014-01-01

374

Computational simulation of the adaptive capacity of vein grafts in response to increased pressure.  

PubMed

Vein maladaptation, leading to poor long-term patency, is a serious clinical problem in patients receiving coronary artery bypass grafts (CABGs) or undergoing related clinical procedures that subject veins to elevated blood flow and pressure. We propose a computational model of venous adaptation to altered pressure based on a constrained mixture theory of growth and remodeling (G&R). We identify constitutive parameters that optimally match biaxial data from a mouse vena cava, then numerically subject the vein to altered pressure conditions and quantify the extent of adaptation for a biologically reasonable set of bounds for G&R parameters. We identify conditions under which a vein graft can adapt optimally and explore physiological constraints that lead to maladaptation. Finally, we test the hypothesis that a gradual, rather than a step, change in pressure will reduce maladaptation. Optimization is used to accelerate parameter identification and numerically evaluate hypotheses of vein remodeling. PMID:25376151

Ramachandra, Abhay B; Sankaran, Sethuraman; Humphrey, Jay D; Marsden, Alison L

2015-03-01

375

Radiotherapeutic Options for Hepatocellular Carcinoma with Portal Vein Tumor Thrombosis  

PubMed Central

Portal vein tumor thrombosis (PVTT) is a common paraneoplastic condition in advanced primary hepatocellular carcinoma or hepatobiliary tract malignancies. Tumors with PVTT are frequently associated with adverse and aggressive features such as intrahepatic tumor dissemination, early treatment failure, or deterioration of hepatic function. Therefore, the treatment outcomes for PVTT in historical series are often dismal and discouraging. More recently, beneficial effects and excellent outcomes of external beam radiation therapy (EBRT) for treating this disease have been reported, and the use of EBRT is becoming more common because of the non-invasive nature of RT and rapid advances in RT technology. We hope to be able to cure this devastating condition in the near future with more advanced and efficacious disease management strategies. The current status and clinical trial results for EBRT as a promising treatment option for managing PVTT will be discussed here. PMID:24804174

Lee, Dong Soo; Seong, Jinsil

2014-01-01

376

Deep Vein Thrombosis: Diagnosis of a Comon Clinical Problem  

PubMed Central

Ultrasound is recognized as a very accurate first line diagnostic tool when a patient presents with a symptomatic lower extremity suggesting acute venous thrombus. Advantages of ultrasound are that it does not involve using radiation or contrast and can be performed portably, generally with no complications. In many patients, other abnormalities such as Baker's cysts, arterial aneurysms, or hematomas can be detected and can explain the symptoms. Some limitations are that ultrasound is dependent on the skills of the sonographer and is very limited in visualization of iliac and abdominal veins. We are currently investigating computed tomography (CT) venography, which appears to be an accurate alternative, particularly for obese patients or when pelvic or abdominal thrombus is suspected. PMID:22822309

DiVittorio, Roy; Bluth, Edward I.; Sullivan, Michael A.

2002-01-01

377

Respiratory Hemodynamics in the Hepatic Veins-Abnormal Patterns.  

PubMed

The flow pattern in the hepatic veins (HVs) is dependent on the cardiac cycle and right heart hemodynamics and influenced by the respiratory cycle and the liver parenchyma. Most disease states that affect the right heart alter the HV Doppler in a manner independent of the respiratory cycle. Some diseases that typically involve the pericardium, right ventricular myocardium, or respiratory system confer characteristic changes to the HV flow in a manner dependent on the respiratory cycle. Analysis of the HV Doppler with assessment of the respiratory changes in flow and their timing helps to distinguish among the various disease states. In this manuscript, we discuss the effect of respiration on HV flow in patients with abnormal right heart function and illustrate the use of the respiratory changes in the HV Doppler as a tool for diagnosis. PMID:25252115

Fadel, Bahaa M; Alkalbani, Ahmad; Husain, Aysha; Dahdouh, Ziad; Di Salvo, Giovanni

2014-09-24

378

Respiratory Hemodynamics in the Hepatic Veins-Normal Pattern.  

PubMed

Doppler interrogation of blood flow in the hepatic veins (HVs) is a part of any comprehensive echocardiographic examination. Data derived from the HV Doppler provide a useful tool for the assessment of right heart function. Beyond its dependence on the cardiac cycle, right heart hemodynamics, and compliance of the liver parenchyma, blood flow in the HVs is influenced by the respiratory cycle. Systematic analysis of the behavior of the HV Doppler during respiration allows one to recognize normal and abnormal flow-patterns and distinguish among various disease states that involve the right heart. In this manuscript we discuss the effect of respiration on the HV Doppler in individuals with normal right heart function. PMID:25220604

Fadel, Bahaa M; Alkalbani, Ahmad; Husain, Aysha; Dahdouh, Ziad; Di Salvo, Giovanno

2014-09-15

379

Acute scrotum in a neonate caused by renal vein thrombosis.  

PubMed

The authors report on a rare case of neonatal scrotal oedema occurring concurrently with pain upon palpation of the spermatic cord on the first day of life. An ultrasound examination showed poor perfusion of the left testicle and a thrombosis of the left renal vein; intraoperative exploration indicated necrosis of the left testicle without signs of torsion. Gorged vessels with paravasal bleeding were found in the spermatic cord. The authors hypothesise that necrosis of the testicle may result from haemorrhagic infarction caused by renal venous thrombosis. Acute scrotal discolouration with pain upon palpation in neonates is usually attributed to testicular torsion. The authors report a case where these symptoms had a different cause. PMID:20921154

Maas, C; Müller-Hansen, I; Flechsig, H; Poets, C F

2011-03-01

380

A new technique for recording compliance of human hand veins.  

PubMed

1 A new technique for determining venous compliance at a standardized congestion pressure has been developed based on the optical method described by Nachev, Collier & Robinson (1971). It uses a linear variable differential transformer for a direct and continuous recording of venous compliance. 2 This method has been used to establish dose-response curves for the constrictor effects of noradrenaline, adrenaline, 5-hydroxytryptamine and dihydroergotamine after direct local infusion. 3 A parallel shift to the right of the noradrenaline dose-response curves was observed after local infusion of phentolamine, showing that the method can be used also to study interactions between agonists and antagonists on human veins in vivo. The usefulness of this technique for investigating the effects of orally administered drugs has also been established. The venoconstrictor action of dihydroergotamine reached its maximum after 1.5 h and remained almost constant for the period of observation (8 h). PMID:7213525

Aellig, W H

1981-03-01

381

The anatomy of the arteries and veins of the breast.  

PubMed

Textbook accounts of this subject are inadequate. This review considers the work of Cooper and Salmon and reproduces some of their figures. Applications in the diagnosis and treatment of cancer are discussed. The largest mammary arteries are the lateral (from the axillary) and the anterior medial and posterior medial (from the internal thoracis). The branches of these arteries do not follow the duct system, but instead form a plexus in the anterior fat layer. Normally there are no hypervascular or hypovascular areas. The contribution of the mammary branches of the posterior (aortic) intercostal arteries is minor. There are superficial and deep sets of veins, the latter associated with arteries. Mammary vessels of living women are demonstrated by infrared photography, thermography, and mammography. In the diagnostic use of these methods there is a tendency to rely upon the concept of normal vascular symmetry, but this is a fallacy. PMID:839798

Cunningham, L

1977-01-01

382

Venous Ulcers: New Options in Treatment: Minimally Invasive Vein Surgery  

PubMed Central

Venous disease has a spectrum of presentations. The most advanced state of chronic venous insufficiency (CVI) managed by wound care specialists being ulceration of the lower extremity. The goal of all treatments for advanced venous disease is to decrease ambulatory venous hypertension. Treatment can be divided into exogenous and endogenous methods. Exogenous methods include those applied externally such as compression, elevation, debridement and wound dressings. Endogenous methods treat the underlying venous pathology either due to venous valvular dysfunction or venous obstruction leading to venous hypertension. Recently, significant advances in endogenous methods have evolved. The development of a new concept, minimally invasive vein surgery (MIVS), has improved upon traditional, open, invasive treatments of venous disease. MIVS techniques are performed percutaneously, with minimal anesthesia, no incisions and rarely require hospital admission. This article summarizes the concept of MIVS, describes each method of MIVS and its complementary role in the management of venous leg ulcers patients. PMID:24527103

Poblete, Honesto; Elias, Steven

2009-01-01

383

How metalliferous brines line Mexican epithermal veins with silver  

PubMed Central

We determined the composition of ~30-m.y.-old solutions extracted from fluid inclusions in one of the world's largest and richest silver ore deposits at Fresnillo, Mexico. Silver concentrations average 14 ppm and have a maximum of 27 ppm. The highest silver, lead and zinc concentrations correlate with salinity, consistent with transport by chloro-complexes and confirming the importance of brines in ore formation. The temporal distribution of these fluids within the veins suggests mineralization occurred episodically when they were injected into a fracture system dominated by low salinity, metal-poor fluids. Mass balance shows that a modest volume of brine, most likely of magmatic origin, is sufficient to supply the metal found in large Mexican silver deposits. The results suggest that ancient epithermal ore-forming events may involve fluid packets not captured in modern geothermal sampling and that giant ore deposits can form rapidly from small volumes of metal-rich fluid. PMID:23792776

Wilkinson, Jamie J.; Simmons, Stuart F.; Stoffell, Barry

2013-01-01

384

Classification of recipient veins in microsurgical flap reconstructions of the lower extremities.  

PubMed

It is difficult to cure severe open fractures of the lower extremities due to the frequent occurrence of severe damage to soft tissues or blood vessels, as well as bone defects, and concomitant infection, such as osteomyelitis. If appropriate treatment is not performed, long-term complications, such as nonunion of the bone, intractable ulcers, or other disorders, may arise. Between 1993 and 2010, we reviewed the records of 27 patients, and 28 limbs were treated. A total of 31 free-tissue transfers were performed on these 28 limbs. In this study, we classified the degree of damage based on the operative appearance of the condition of the recipient vein. A state that was normal or near-normal was described as type I-normal. A vein that was buried under a scar, but was comparatively easy to detach and retained a moderate adventitia was classified as type II-moderate. A vein with close adhesion between the wall and the scar that was not easy to detach was described as type III-severe. We also examined the relationships between recipient vein type and each of the following: (1) concomitant injury, (2) bone reconstruction, (3) preoperative infection, (4) length of time from injury to reconstruction, (5) eventual reoperation, and (6) flap necrosis. The results showed that there was a statistically significant relationship between recipient vein type and each of the following: bone reconstruction, preoperative infection, eventual reoperation, and flap necrosis. The selection of recipient vein is a factor that greatly affects the outcome of reconstruction of open fractures of the lower extremities. It is important to preoperatively estimate the condition of recipient vein even though it is difficult to preoperatively assess the condition. In some cases, only recipient veins in poor condition can be found intraoperatively on the affected leg. Under such circumstances, a cross-leg flap or a vein graft should be performed without hesitation to use recipient veins in a better condition. PMID:21629066

Kusano, Taro; Kimura, Naohiro; Saito, Masami; Fujimura, Taijyu; Kuwahara, Hiroki; Yokoyama, Toshiya; Hosaka, Yoshiaki; Yoshimoto, Shinya

2012-11-01

385

Toward an Optimal Position for IVC Filters: Computational Modeling of the Impact of Renal Vein Inflow  

SciTech Connect

The purpose of this report is to evaluate the hemodynamic effects of renal vein inflow and filter position on unoccluded and partially occluded IVC filters using three-dimensional computational fluid dynamics. Three-dimensional models of the TrapEase and Gunther Celect IVC filters, spherical thrombi, and an IVC with renal veins were constructed. Hemodynamics of steady-state flow was examined for unoccluded and partially occluded TrapEase and Gunther Celect IVC filters in varying proximity to the renal veins. Flow past the unoccluded filters demonstrated minimal disruption. Natural regions of stagnant/recirculating flow in the IVC are observed superior to the bilateral renal vein inflows, and high flow velocities and elevated shear stresses are observed in the vicinity of renal inflow. Spherical thrombi induce stagnant and/or recirculating flow downstream of the thrombus. Placement of the TrapEase filter in the suprarenal vein position resulted in a large area of low shear stress/stagnant flow within the filter just downstream of thrombus trapped in the upstream trapping position. Filter position with respect to renal vein inflow influences the hemodynamics of filter trapping. Placement of the TrapEase filter in a suprarenal location may be thrombogenic with redundant areas of stagnant/recirculating flow and low shear stress along the caval wall due to the upstream trapping position and the naturally occurring region of stagnant flow from the renal veins. Infrarenal vein placement of IVC filters in a near juxtarenal position with the downstream cone near the renal vein inflow likely confers increased levels of mechanical lysis of trapped thrombi due to increased shear stress from renal vein inflow.

Wang, S L; Singer, M A

2009-07-13

386

MR Venography of Deep Veins: Changes with Uterine Fibroid Embolization  

SciTech Connect

Deep veins (DVs) can be compressed by a uterus enlarged with fibroids. The purpose of this study was to assess the degree of luminal narrowing of DVs caused by a myomatous uterus, and the change in DV narrowing in women with symptomatic fibroids after embolization using time-of-flight (TOF)-magnetic resonance venography (MRV). Twenty-nine consecutive women with symptomatic uterine fibroids underwent TOF-MRV and pelvic MRI before and 4 months after embolization. Based on the TOF-MRV, we evaluated the luminal narrowing of three DVs, including the inferior vena cava, and the bilateral common and external iliac veins, and divided the findings into three grades. The scores for each DV were added for each patient (lowest, 0; highest, 6). DV scores and symptom severity (SS) scores were compared between the baseline and 4 months after embolization using the paired t-test. The relationship between DV scores and uterine volume was investigated using Pearson's test. DV scores decreased significantly, from 1.52 {+-} 1.70 at baseline to 0.93 {+-} 1.56 at 4 months after embolization (p = 0.004). The uterine volume decreased from 948 {+-} 647 mL at baseline to 617 {+-} 417 mL at 4 months after embolization (p < 0.001). DV score correlated with uterine volume (r = 0.856, p < 0.001). SS scores decreased from 54.5 {+-} 14.6 at baseline to 26.8 {+-} 15.4 at 4 months after embolization (p < 0.001). In conclusion, the degree of luminal narrowing of DVs caused by a uterus with fibroids is correlated with the uterine volume. Uterine artery embolization may induce an improvement of luminal narrowing of DVs due to a reduction of the myomatous uterus volume.

Katsumori, Tetsuya, E-mail: katsumo@eurus.dti.ne.jp; Kasahara, Toshiyuki; Tsuchida, Yoko; Nara, Yoshinori [Saiseikai Shiga Hospital, Department of Radiology (Japan)

2009-03-15

387

Manual pressure distension of the human saphenous vein changes its biomechanical properties—implication for coronary artery bypass grafting  

Microsoft Academic Search

Patency rates of saphenous vein grafts following coronary artery bypass grafting (CABG) depend on multiple factors. Information regarding the impact of biomechanical properties of vein grafts on patency rates is not available. The objective of the present study was to evaluate whether uncontrolled manual pressure distension during routine preparation of the saphenous vein in CABG-induced changes in the biomechanical properties

Jingbo Zhao; Jan Jesper Andreasen; Jian Yang; Bodil Steen Rasmussen; Donghua Liao; Hans Gregersen

2007-01-01

388

Blood Vessel Classification into Arteries and Veins in Retinal Claudia Kondermann and Daniel Kondermanna and Michelle Yanb  

E-print Network

Blood Vessel Classification into Arteries and Veins in Retinal Images Claudia Kondermann and Daniel for DR are abnormally wide veins leading to an unusually low ratio of the average diameter of arteries symptom being an abnormal AVR value. To determine it, a classification of vessels as arteries or veins

Cremers, Daniel

389

Early electrical remodeling in rabbit pulmonary vein results from trafficking of intracellular SK2 channels to membrane sites  

Microsoft Academic Search

Objective: Atrial fibrillation is often initiated by bursts of ectopic activity arising in the pulmonary veins. We have previously shown that a 3- h intermittent burst pacing protocol (BPP), mimicking ectopic pulmonary vein foci, shortens action potential duration (APD) locally at the pulmonary vein-atrial interface (PV) while having no effect elsewhere in rabbit atrium. This shortening is Ca2+ dependent and

Nazira Özgen; Wen Dun; Eugene A. Sosunov; Evgeny P. Anyukhovsky; Masanori Hirose; Heather S. Duffy; Penelope A. Boyden; Michael R. Rosen

2007-01-01

390

A structural analysis of the Minas da Panasqueira vein network and related fracture generations  

NASA Astrophysics Data System (ADS)

The Minas da Panasqueira is a world-class W-Cu-Sn vein-type deposit, situated within the Central Iberian Zone of the Palaeozoic Iberian Massif (Portugal). The deposit consists of a network of subhorizontal, sill-like massive quartz veins situated above the southwestern extremity of a greisen cupola, within regionally metamorphosed, isoclinally folded, lower-greenschist slates and greywackes. The greisen cupola is part of a larger intrusive complex, emplaced during the late- to post-tectonic stage of the Variscan orogeny. The late-Variscan granitoid(s) underlying the Panasqueira deposit is considered to have served as a major metal source. The structure of the network of subhorizontal extension veins, consists of numerous planar vein lobes that are separated by host-rock bridges and merge at branch-points. A structural analysis demonstrates that not only within the Panasqueira mine, but also on a more regional scale, one or more generations of flat-lying fractures are present. The veins clearly exploited these pre-existing discontinuities, as confirmed by (1) the vein geometry being directly influenced by variations in the orientation of the initial fracture sets and (2) the geometry of the rock bridges and overlapping vein morphologies, consistently showing straight-line propagating crack tips. If veining is governed by a preferential, strongly developed anisotropy in the host rock, the hypothesis of vein lobes and rock bridges forming during propagation of the parent crack by tip-line bifurcation and confinement processes (Foxford et al., 2000) does not seem plausible. Instead, we propose that the rock bridges formed from several, initially separate and small veinlets that eventually overlapped in an en echelon arrangement during progressive propagation and inflation. Bending of the rock bridges and incipient vein rotation indicate that veining occurred near the brittle-ductile transition. Using a quantitative analysis of bridge orientations, vein aspect ratios and tip lines, we try to sort out if a dominant ?2 propagation direction, typical for hydrofractures, exists within the vein network. By doing so, we can evaluate whether the subhorizontal vein network formed under a compressive stress regime, or was mainly dictated by the strength anisotropy of the rocks under near-isotropic stress conditions of ?hmax ? ?hmin. The regional dominance of subhorizontal aplites, pegmatites and hydrothermal veins, exploiting subhorizontal fracture networks, occurs over a wide area of more than 100 km2 along the Serra de Estrela granitic massif (Derré et al., 1986). This orientation contrasts with the more common vertical attitude of granite-related hydrothermal veins, observed throughout the Iberian massif. A detailed orientation analysis of the fracture sets should allow to explore the possible causes of this particular late orogenic, flat-lying fracture network related to the granitic intrusion. References Derré, C., Lecolle, M., Roger, G., Tavares de Freitas Carvalho, J., 1986. Tectonics, magmatism, hydrothermalism and sets of flat joints locally filled by Sn-W, aplite-pegmatite and quartz veins, southeastern border of the Serra de Estrela granitic massif (Beira Baixa, Portugal). Ore Geology Reviews 1, 43-56. Foxford, K. A., Nicholson, R., Polya, D. A., and Hebblethwaite, R. P. B., 2000. Extensional failure and hydraulic valving at Minas da Panasqueira, Portugal; evidence from vein spatial distributions, displacements and geometries. Journal of Structural Geology 22, 1065-1086.

Jacques, Dominique; Vieira, Romeu; Muchez, Philippe; Sintubin, Manuel

2014-05-01

391

Arterial Shear Stress Reduces Eph-B4 Expression in Adult Human Veins  

PubMed Central

Vein graft adaptation to the arterial environment is characterized by loss of venous identity, with reduced Ephrin type-B receptor 4 (Eph-B4) expression but without increased Ephrin-B2 expression. We examined changes of vessel identity of human saphenous veins in a flow circuit in which shear stress could be precisely controlled. Medium circulated at arterial or venous magnitudes of laminar shear stress for 24 hours; histologic, protein, and RNA analyses of vein segments were performed. Vein endothelium remained viable and functional, with platelet endothelial cell adhesion molecule (PECAM)-expressing cells on the luminal surface. Venous Eph-B4 expression diminished (p = .002), Ephrin-B2 expression was not induced (p = .268), and expression of osteopontin (p = .002) was increased with exposure to arterial magnitudes of shear stress. Similar changes were not found in veins placed under venous flow or static conditions. These data show that human saphenous veins remain viable during ex vivo application of shear stress in a bioreactor, without loss of the venous endothelium. Arterial magnitudes of shear stress cause loss of venous identity without gain of arterial identity in human veins perfused ex vivo. Shear stress alone, without immunologic or hormonal influence, is capable of inducing changes in vessel identity and, specifically, loss of venous identity. PMID:25191151

Model, Lynn S.; Hall, Michael R.; Wong, Daniel J.; Muto, Akihito; Kondo, Yuka; Ziegler, Kenneth R.; Feigel, Amanda; Quint, Clay; Niklason, Laura; Dardik, Alan

2014-01-01

392

Misinsertion of central venous catheter into the suspected vertebral vein: a case report  

PubMed Central

We experienced a case in which a central venous catheter (CVC) was misplaced into the wrong vein, which was mistaken for the internal jugular vein (IJV), identified by chest x-ray and ultrasound. The vertebral vein passes through the transverse foramina from the atlas to the 6th cervical vertebra. After exiting the transverse foramen of the 6th vertebra, the vein subsequently runs anterolateral to the vertebral artery and posterior to the IJV and drains the innominate vein. In this case, chest x-ray and ultrasound revealed that the inserted CVC had a course very similar to the vertebral vein. The misplacement of a CVC into the vertebral vein might occur from excessive rotation of the patient's head, which leads to alterations in the cervical vascular anatomy, and from deep insertion of the puncture needle. Therefore, it is advised, for safe CVC insertion, to minimize a patient's head rotation and to make use of ultrasound when the anatomical structures cannot be clearly identified. PMID:25473464

Yang, So-Hee; Jung, Sung-Mee

2014-01-01

393

Arterial shear stress reduces eph-b4 expression in adult human veins.  

PubMed

Vein graft adaptation to the arterial environment is characterized by loss of venous identity, with reduced Ephrin type-B receptor 4 (Eph-B4) expression but without increased Ephrin-B2 expression. We examined changes of vessel identity of human saphenous veins in a flow circuit in which shear stress could be precisely controlled. Medium circulated at arterial or venous magnitudes of laminar shear stress for 24 hours; histologic, protein, and RNA analyses of vein segments were performed. Vein endothelium remained viable and functional, with platelet endothelial cell adhesion molecule (PECAM)-expressing cells on the luminal surface. Venous Eph-B4 expression diminished (p = .002), Ephrin-B2 expression was not induced (p = .268), and expression of osteopontin (p = .002) was increased with exposure to arterial magnitudes of shear stress. Similar changes were not found in veins placed under venous flow or static conditions. These data show that human saphenous veins remain viable during ex vivo application of shear stress in a bioreactor, without loss of the venous endothelium. Arterial magnitudes of shear stress cause loss of venous identity without gain of arterial identity in human veins perfused ex vivo. Shear stress alone, without immunologic or hormonal influence, is capable of inducing changes in vessel identity and, specifically, loss of venous identity. PMID:25191151

Model, Lynn S; Hall, Michael R; Wong, Daniel J; Muto, Akihito; Kondo, Yuka; Ziegler, Kenneth R; Feigel, Amanda; Quint, Clay; Niklason, Laura; Dardik, Alan

2014-09-01

394

Internal Jugular Vein Blood Flow in Multiple Sclerosis Patients and Matched Controls  

PubMed Central

The aim of the study was to investigate the Internal Jugular Veins dynamics using contrast enhanced ultrasonography in Multiple Sclerosis patients, clinically isolated syndrome patients and healthy controls. Contrast enhanced ultrasonography imaging of the Internal Jugular Vein was performed in fifty-eight patients with Multiple Sclerosis, seven clinically isolated syndrome patients and in thirteen healthy controls. Time-intensity curves were quantified using a semi-automated method and compared with clinical disease outcomes. Wash-out parameters were calculated and six Time-intensity curves shapes were created. Significantly reduction of wash-out rate in Internal Jugular Veins was detected in Multiple Sclerosis patients compared to healthy controls [22.2% (2.7%–65.9%) vs. 33.4% (16.2%–76.8%); P<0.005]. Internal Jugular Vein enhancement was heterogeneous in patients with Multiple Sclerosis and consisted of slow wash-out Time-intensity curves shapes, compared with almost only one type of Time-intensity curves shape in control subjects that correspond to fast enhancement and fast wash-out. The vein wash-in parameters were similar in Multiple Sclerosis group compared with controls. A significant correlation was found between Internal Jugular Vein wash-out and level of disability (R?=??0.402, p<0.05). Contrast enhanced ultrasonography of the Internal Jugular Vein with time intensity curve analysis revealed alterations of cerebral venous outflow in Multiple Sclerosis patients, however mechanisms that determine this condition remains unclear. PMID:24675965

Mancini, Marcello; Lanzillo, Roberta; Liuzzi, Raffaele; Di Donato, Orlando; Ragucci, Monica; Monti, Serena; Salvatore, Elena; Morra, Vincenzo Brescia; Salvatore, Marco

2014-01-01

395

Sliding Window-Based Region of Interest Extraction for Finger Vein Images  

PubMed Central

Region of Interest (ROI) extraction is a crucial step in an automatic finger vein recognition system. The aim of ROI extraction is to decide which part of the image is suitable for finger vein feature extraction. This paper proposes a finger vein ROI extraction method which is robust to finger displacement and rotation. First, we determine the middle line of the finger, which will be used to correct the image skew. Then, a sliding window is used to detect the phalangeal joints and further to ascertain the height of ROI. Last, for the corrective image with certain height, we will obtain the ROI by using the internal tangents of finger edges as the left and right boundary. The experimental results show that the proposed method can extract ROI more accurately and effectively compared with other methods, and thus improve the performance of finger vein identification system. Besides, to acquire the high quality finger vein image during the capture process, we propose eight criteria for finger vein capture from different aspects and these criteria should be helpful to some extent for finger vein capture. PMID:23507824

Yang, Lu; Yang, Gongping; Yin, Yilong; Xiao, Rongyang

2013-01-01

396

Blood Flows in Tributaries of the Portal Vein: Anatomical and Angiographic Studies in Normal Beagle Dogs.  

PubMed

Liver anatomy, particularly its vascularization, has been investigated in many studies in dogs. Knowledge of blood flow from the main tributaries of the portal vein (PV) is necessary to explain the preferential sites of secondary lesions within the liver based on the site of the initial malignant lesion. How these flows come together was established in an earlier ex vivo study. Here, we highlight in vivo the blood flows from the main PV tributaries and their distribution in the liver of normal dogs. Portographs of the main PV tributaries were obtained in seven dogs after injection of an angiographic contrast medium. After euthanasia, the livers and their portal vascularization (PV and tributaries) were extracted for a comparative corrosion cast study. Flows were demonstrated in the cranial mesenteric vein, caudal mesenteric vein and splenic vein. However, no proper flow could be distinguished for the gastroduodenal and ileocolic veins. All these tributaries primarily supply the lateral liver lobes (right or left). Most of our observations indicate that the cranial mesenteric, caudal mesenteric and splenic veins primarily supply the right lateral lobe and the caudate process of the caudate lobe and secondarily the left lateral lobe, left medial lobe and the quadrate lobe. The two other tributaries (gastroduodenal and ileocolic veins) primarily supply the right lateral lobe and the caudate process of the caudate lobe. PMID:25376527

Mogicato, G; Vautravers, G; Meynaud-Collard, P; Deviers, A; Sautet, J

2014-11-01

397

Extraluminal venous interruption for free-floating thrombus in the deep veins of lower limbs.  

PubMed

The free-floating thrombus (FFT) represents a particular form of deep vein thrombosis with extremely high potential of fatal pulmonary embolism. The purpose of the study was to evaluate the early results of aggressive surgical approach to FFT. During the period 2005-2008 years FFT was diagnosed in 13 patients. Demographic characteristics of patients: medium age--54.7 years, male--76.9%, significant comorbidity--5 (38.5%) cases. Localization of FFT: superficial femoral vein (SFV)--5 (38.5%), common femoral vein (CFV)--4 (30.7%), external iliac vein (EIV)--2 (15.4%), inferior cava vein (ICV)--2 (15.4%). Manifestations of previous pulmonary embolism were documented preoperatively in 3 (23.1%) cases. The following emergency surgical procedures were performed: ligation--3 (23.1%) or plication--2 (15.4%) of SFV; plication of CFV--5 (38.5%) patients, combined in 4 cases with partial thrombectomy (free-floating part of thrombus); plication of common iliac vein--1 (7.6%); plication of ICV--2 (15.4%) cases. Primary or recurrent cases of clinically significant pulmonary embolism were not detected in the postoperative period. The accumulated experience of surgical management of patients with FFT reveals the important role of deep vein ligation/plication in prevention of fatal pulmonary embolism. PMID:20726302

Casian, D; Gutsu, E; Culiuc, V

2010-01-01

398

Petrochemical Characteristics of the Felsic Veins within the Kaman Metamorphic Rocks: Central Anatolia, Turkiye  

NASA Astrophysics Data System (ADS)

The basement metamorphic rocks which outcrops in the vicinity of Kaman-Kirsehir, in Central Anatolia are composed of gneiss, biotite schist, amphibole schist, quartzite intercalated with amphibolite lenses in the región. This metamorphic rocks are cut by felsic veins. Felsic vein rocks are mainly composed of orthoclase, quartz, plagioclase, biotite and pyroxene minerals with accessory titanite and opaque minerals. Felsic vein rocks have holocrystalline texture in general and composed of mega crystalline orthoclase, quartz and mostly euhedral mafic minerals. The felsic veins are quartz syenite in composition. They are characterised by the lack of mafic magmatic enclaves. Clay formation, chloritization and opasitization with minor amount of uralitization are the main alteration part of the unit. The felsic veins which cut the Kaman Metamorphic rocks have SiO2 % concentration vary between 57.22-70.9 %, Na2O% concentration between 1.9-2.63% and K2O% concentration between 6.34 - 9.01%. Felsic veins are enriched in LIL (large ion lithophile) elements compared to HFS (high field strength) elements. Obtained geochemical and petrographical datas suggest that the felsic veins are genetically related with Central Anatolia alkalen magmatic rocks and they may belong to the alkalen magmatic rocks which have excess crustal contamination.

Kilic, C. O.; Kadioglu, Y. K.

2012-04-01

399

Contact-Free Palm-Vein Recognition Based on Local Invariant Features  

PubMed Central

Contact-free palm-vein recognition is one of the most challenging and promising areas in hand biometrics. In view of the existing problems in contact-free palm-vein imaging, including projection transformation, uneven illumination and difficulty in extracting exact ROIs, this paper presents a novel recognition approach for contact-free palm-vein recognition that performs feature extraction and matching on all vein textures distributed over the palm surface, including finger veins and palm veins, to minimize the loss of feature information. First, a hierarchical enhancement algorithm, which combines a DOG filter and histogram equalization, is adopted to alleviate uneven illumination and to highlight vein textures. Second, RootSIFT, a more stable local invariant feature extraction method in comparison to SIFT, is adopted to overcome the projection transformation in contact-free mode. Subsequently, a novel hierarchical mismatching removal algorithm based on neighborhood searching and LBP histograms is adopted to improve the accuracy of feature matching. Finally, we rigorously evaluated the proposed approach using two different databases and obtained 0.996% and 3.112% Equal Error Rates (EERs), respectively, which demonstrate the effectiveness of the proposed approach. PMID:24866176

Kang, Wenxiong; Liu, Yang; Wu, Qiuxia; Yue, Xishun

2014-01-01

400

Early Growth Response Protein 1 Promotes Restenosis by Upregulating Intercellular Adhesion Molecule-1 in Vein Graft  

PubMed Central

Objectives. To verify the relationship between Egr-1 and vein graft restenosis and investigate the related mechanisms. Methods. Mouse vein graft models were established in Egr-1 knockout (KO) and wild-type (WT) mice. The vein grafts in the mice were taken for pathological examination and immunohistochemical analysis. The endothelial cells (ECs) were stimulated by using a computer-controlled cyclic stress unit. BrdU staining and PCR were used to detect ECs proliferation activity and Egr-1 and ICAM-1 mRNA expression, respectively. Western-blot analysis was also used to detect expression of Egr-1 and intercellular adhesion molecule-1 (ICAM-1) proteins. Results. The lumens of vein grafts in Egr-1 KO mice were wider than in WT mice. ECs proliferation after mechanical stretch stimulation was suppressed by Egr-1 knockout (P < 0.05). Both in vein grafts and ECs from WT mice after mechanical stretch stimulation, mRNA expression and protein of Egr-1 and ICAM-1 showed increases (P < 0.05). However, ICAM-1 expression was significantly suppressed in ECs from Egr-1 knockout mice (P < 0.05). Conclusions. Egr-1 may promote ECs proliferation and result in vein graft restenosis by upregulating the expression of ICAM-1. As a key factor of vein graft restenosis, it could be a target for the prevention of restenosis after CABG surgery. PMID:24386503

Zhang, Kui; Cao, Jian; Dong, Ran; Du, Jie

2013-01-01

401

Preoperative predictors of portal vein thrombosis after splenectomy with periesophagogastric devascularization  

PubMed Central

AIM: To evaluate the predictive value of preoperative predictors for portal vein thrombosis (PVT) after splenectomy with periesophagogastric devascularization. METHODS: In this prospective study, 69 continuous patients with portal hypertension caused by hepatitis B cirrhosis underwent splenectomy with periesophagogastric devascularization in West China Hospital of Sichuan University from January 2007 to August 2010. The portal vein flow velocity and the diameter of portal vein were measured by Doppler sonography. The hepatic congestion index and the ratio of velocity and diameter were calculated before operation. The prothrombin time (PT) and platelet (PLT) levels were measured before and after operation. The patients’ spleens were weighed postoperatively. RESULTS: The diameter of portal vein was negatively correlated with the portal vein flow velocity (P < 0.05). Thirty-three cases (47.83%) suffered from postoperative PVT. There was no statistically significant difference in the Child-Pugh score, the spleen weights, the PT, or PLT levels between patients with PVT and without PVT. Receiver operating characteristic curves showed four variables (portal vein flow velocity, the ratio of velocity and diameter, hepatic congestion index and diameter of portal vein) could be used as preoperative predictors of postoperative portal vein thrombosis. The respective values of the area under the curve were 0.865, 0.893, 0.884 and 0.742, and the respective cut-off values (24.45 cm/s, 19.4333/s, 0.1138 cm/s-1 and 13.5 mm) were of diagnostically efficient, generating sensitivity values of 87.9%, 93.9%, 87.9% and 81.8%, respectively, specificities of 75%, 77.8%, 86.1% and 63.9%, respectively. CONCLUSION: The ratio of velocity and diameter was the most accurate preoperative predictor of portal vein thrombosis after splenectomy with periesophagogastric devascularization in hepatitis B cirrhosis-related portal hypertension. PMID:22553410

Zhang, Yu; Wen, Tian-Fu; Yan, Lu-Nan; Yang, Hong-Ji; Deng, Xiao-Fan; Li, Chuan; Wang, Chuan; Liang, Guan-Lin

2012-01-01

402

Pretreatment with intraluminal rapamycin nanoparticle perfusion inhibits neointimal hyperplasia in a rabbit vein graft model  

PubMed Central

Purpose Poly lactic-co-glycolic acid nanoparticles (PLGA-NP) are widely used as a biodegradable biomaterial in medicine. Rapamycin-eluting stents have been used for prevention of restenosis during surgery. This study investigated the effect of pretreatment with intraluminal perfusion of carbopol-encapsulated rapamycin-loaded PLGA nanoparticles (RAP-PLGA-NP) on neointimal hyperplasia in a rabbit vein graft model. Methods A segment of common carotid artery was replaced with a segment of external jugular vein in 60 rabbits which were then separated into four treatment groups, ie, Group 1, in which vein grafts were pretreated with intraluminal RAP-PLGA-NP perfusion, Group 2 in which vein grafts underwent equivalent empty vehicle (PLGA-NP) perfusion, Group 3, in which vein grafts received no treatment, and Group 4, which served as a sham operation group receiving normal vein contrast. On postoperative day 28, the grafts and normal veins were harvested for histologic examination, flow cytometry analysis, and high-performance liquid chromatography measurement. Results Compared with Group 1, the intima of the grafts were thickened, the ratio of intimal area to vessel area increased, and the collagen volume index of the vein grafts increased significantly in Groups 2 and 3. The cell proliferation index in Group 1 (21.11 ± 3.15%) was much lower than that in Group 2 (30.35 ± 2.69%) and in Group 3 (33.86 ± 8.72%). By high-performance liquid chromatography measurement, retention of rapamycin was detected in Group 1 (11.2 ± 0.37 ?g/10 mg) 28 days after single drug perfusion. Conclusion Pretreatment with intraluminal RAP-PLGA-NP perfusion may inhibit neointimal hyperplasia in vein grafts by penetrating into local tissue and limiting cell proliferation. PMID:21042547

Liu, Kai; Cao, Guangqing; Zhang, Xiquan; Liu, Ruifang; Zou, Weiwei; Wu, Shuming

2010-01-01

403

Embryologicalic collateral venous channel on radionuclide liver/spleen study  

SciTech Connect

Obstruction of normal venous portal blood flow generally results in collateral circulation. The obstruction may be intrinsic t the vasculature (e.g., hepatic vein thrombosis, vascular anomalies) or it may be extravascular (e.g., cirrhosis, hepatic masses) and may effect blood flow by deforming and compressing the intrahepatic or splenoportal axis vessels. A technetium-99m sulfur colloid liver/spleen study demonstrates what is thought to be a functional paraumbilical or umbilical vein in a cirrhotic patient with portal hypertension.

Wilkinson, R.H. Jr.; Johnson, D.G.

1983-07-01

404

High-contrast subcutaneous vein detection and localization using multispectral imaging  

PubMed Central

Abstract. Multispectral imaging has shown promise in subcutaneous vein detection and localization in human subjects. While many limitations of single-wavelength methods are addressed in multispectral vein detection methods, their performance is still limited by artifacts arising from background skin reflectance and optimality of postprocessing algorithms. We propose a background removal technique that enhances the contrast and performance of multispectral vein detection. We use images acquired at visible wavelengths as reference for removing skin reflectance background from subcutaneous structures in near-infrared images. Results are validated by experiments on human subjects. PMID:23649005

Wang, Fengtao; Behrooz, Ali; Morris, Michael; Adibi, Ali

2013-01-01

405

Cerebral infarction due to carotid occlusion and carbon monoxide exposure III. Influence of neck vein occlusion.  

PubMed Central

Unilateral cerebral infarcts were produced in the rat by ligation of one common carotid artery and a subsequent exposure to carbon monoxide. In animals which had undergone an additional ligation of the external jugular veins leading to a moderate increase of the cephalic venous pressure the outcome of the procedure was ameliorated significantly. Venous pressure elevation was thought to reduce the venous vascular resistance effectively by preventing the leptomeningeal veins from collapsing. Collapse of the leptomeningeal veins probably occurred during the severe carbon monoxide-induced hypotension causing a steep increase of cerebral vascular resistance. Images PMID:6886722

Laas, R; Igloffstein, J

1983-01-01

406

Hepatic Veins and Inferior Vena Cava Thrombosis in a Child Treated by Transjugular Intrahepatic Portosystemic Shunt  

SciTech Connect

We report the case of a 9-year-old boy with portal hypertension, due to Budd-Chiari syndrome, and retrohepatic inferior vena cava thrombosis, submitted to a transjugular intrahepatic portosystemic shunt (TIPS) by connecting the suprahepatic segment of the inferior vena cava directly to the portal vein. After 3 months, the withdrawal of anticoagulants promoted the thrombosis of the TIPS. At TIPS revision, thrombosis of the TIPS and the main portal vein and clots at the splenic and the superior mesenteric veins were found. Successful angiography treatment was performed by thrombolysis and balloon angioplasty of a severe stenosis at the distal edge of the stent.

Carnevale, Francisco Cesar, E-mail: fcarnevale@uol.com.br; Santos, Aline Cristine Barbosa [Sao Paulo University Medical School, Interventional Radiology Unit, Radiology Institute, Hospital das Clinicas (Brazil); Tannuri, Uenis [Sao Paulo University Medical School, Liver Transplantation Unit, Children's Institute, Hospital das Clinicas (Brazil); Cerri, Giovanni Guido [Sao Paulo University Medical School, Interventional Radiology Unit, Radiology Institute, Hospital das Clinicas (Brazil)

2010-06-15

407

Staged approach for surgical management of external iliac vein aneurysm associated with traumatic femoral arteriovenous fistula.  

PubMed

Aneurysms of the iliac vein are rare. They can occur in association with arteriovenous fistulae located elsewhere. Here, we present a 30-year-old man who developed a large left external iliac vein aneurysm in association with a chronic traumatic arteriovenous fistula in the left thigh. Less than 25 cases of iliac vein aneurysms have been reported in the last 40 years. The presentation and treatment of this condition has been heterogeneous. We suggest that adequate surgical treatment can be offered in a staged approach: aneurysm resection with reconstruction should be done first, followed by closure of the arteriovenous fistula 6 months later. PMID:19828589

Vasquez, Julio C; Montesinos, Efrain; DeLarosa, Jacob; Leon, Juan J

2009-12-01

408

Thrombosis of a Superior Mesenteric Vein Aneurysm: Transarterial Thrombolysis and Transhepatic Aspiration Thrombectomy  

SciTech Connect

We report the case of a 31-year-old woman presenting with abdominal pain due to acute thrombosis of a superior and inferior mesenteric vein aneurysm, which was treated by a combination of arterial thrombolysis and transhepatic thrombus aspiration. At the last follow-up CT, 21 months following this procedure, there was no evidence of rethrombosis, and the patient continues to do well under oral anticoagulation. The literature regarding these uncommon mesenteric vein aneurysms without portal vein involvement, as well as their treatment options, is reviewed.

Hechelhammer, L.; Crook, D.W. [University Hospital of Zuerich, Institute of Diagnostic Radiology (Switzerland); Widmer, U. [University Hospital of Zuerich, Department of Medicine (Switzerland); Wildermuth, S.; Pfammatter, T. [University Hospital of Zuerich, Institute of Diagnostic Radiology (Switzerland)], E-mail: thomas.pfammatter@usz.ch

2004-09-15

409

Central retinal vein obstruction in a neonate occurring during laser photocoagulation treatment for retinopathy of prematurity.  

PubMed

A premature infant who developed central retinal vein obstruction in one eye during laser therapy for high-risk prethreshold retinopathy of prematurity is described. Systemic investigations were done to detect the cause of such an acute and unreported episode. Acquired deficiency of protein C levels was detected. Premature infants are at risk of thromboembolic episodes due to deranged hematological parameters. Acquired protein C deficiency possibly precipitated acute retinal vein occlusion during laser therapy in this infant. Intravitreal bevacizumab was used successfully to treat the episode of retinal venous occlusion. Retinal vein obstruction during laser treatment for retinopathy of prematurity is reported for the first time. PMID:25427339

Phalak, Devendra; Rani, Padmaja Kumari; Balakrishnan, Divya; Jalali, Subhadra

2014-01-01

410

Levoatriocardinal Vein: An Unusual Cause of Right-to-Left Shunting  

PubMed Central

We present a case demonstrating an anomalous vessel connecting the left brachiocephalic vein and the left superior pulmonary vein, found incidentally on computed tomography (CT) imaging. This pulmonary–systemic venous connection, known as a levoatriocardinal vein, is a rare anomaly. In previous descriptions, this vessel has typically been associated with left-to-right shunt. Here, we describe the magnetic resonance imaging (MRI) and CT findings in a case with right-to-left shunting through the anomalous vessel likely secondary to elevated right cardiac pressure.

Shet, Nilima; Maldjian, Pierre

2014-01-01

411

Simultaneous kissing stent in a patient with severe bifurcation pulmonary vein stenosis.  

PubMed

Pulmonary vein stenosis (PVS) is a late and rare complication of pulmonary vein isolation for the treatment of atrial fibrillation. The ideal approach to the management of PVS has not yet been established, however, corrective procedures may include both surgical and percutaneous techniques. We describe the case of a complex bifurcation lesion involving the left superior pulmonary vein. The condition required percutaneous intervention using a modified kissing stent technique with bare metal stents that resulted in an excellent post-operative course, sustained symptomatic relief, and uncomplicated 1-year follow-up. © 2014 Wiley Periodicals, Inc. PMID:24905444

Cubeddu, Roberto J; Gulati, Vishal K

2015-02-01

412

Acute Central Retinal Vein Occlusion Secondary to Reactive Thrombocytosis after Splenectomy  

PubMed Central

The diagnosis and treatment of central retinal vein occlusion was reported in a young patient. Central retinal vein occlusion was probably related to secondary to reactive thrombocytosis after splenectomy. The patient was treated with steroids for papilledema and administered coumadin and aspirin. The symptoms resolved, and the findings returned to normal within three weeks. Current paper emphasizes that, besides other well-known thrombotic events, reactive thrombocytosis after splenectomy may cause central retinal vein occlusion, which may be the principal symptom of this risky complication. Thus, it can be concluded that followup for thrombocytosis and antithrombotic treatment, when necessary, are essential for these cases. PMID:25276452

Oncel Acir, Nursen; Borazan, Mehmet

2014-01-01

413

Balloon occlusion retrograde transvenous obliteration of gastric varices in two non-cirrhotic patients with portal vein thrombosis.  

PubMed

This report describes two non-cirrhotic patients with portal vein thrombosis who underwent successful balloon occlusion retrograde transvenous obliteration (BRTO) of gastric varices with a satisfactory response and no complications. One patient was a 35-year-old female with a history of Crohn's disease, status post-total abdominal colectomy, and portal vein and mesenteric vein thrombosis. The other patient was a 51-year-old female with necrotizing pancreatitis, portal vein thrombosis, and gastric varices. The BRTO procedure was a useful treatment for gastric varices in non-cirrhotic patients with portal vein thrombosis in the presence of a gastrorenal shunt. PMID:24497799

Borghei, Peyman; Kim, Seung Kwon; Zuckerman, Darryl A

2014-01-01

414

[The lumbar vein at L2 and the reno-azygo-lumbar arch: anatomic and radiologic studies].  

PubMed

The lumbar vein at L2 was described by C. Gillot and B. Singer (1974). On the right side, after drawing off the 12th intercostal vein, it forms the lateral root of the azygos vein. Its way is as a frame, transverse going along the body of the 2nd lumbar vertebra, then upward along the spine after having integrated the veins of the L2-L3 intervertebral foramen. In its typical form, the vein is at L2 but it can be at L1 or L3. It takes the name of lateral root of the azygos vein only after receiving the 12th intercostal vein. Because of its diameter (5 mm), it forms a cavo-caval anastomosis via the azygos vein. The renal azygo-lumbar arch of Lejars is the equivalent on the left side of the right vein at L2. This arch contributes to the formation of the lateral root of the hemi-azygos vein. The right vein at L2 and the reno-azygo-lumbar arch were studied by dissections and by radiologic protocols. The radiologic studies (CT, MRI, 3D reconstructions) were carried out after injections of gelatin-gadolinium-minimum and altufix-minimum mixtures. The results showed the numerous variations of origin of the azygos system. The use of multiple and complementary technics are very helpful to describe these variations. PMID:10418002

Plaisant, O; Uhl, J F; Orvoen, G; Sarrazin, J L; Gillot, C; Verdeille, S; Martin-Bouyer, Y; Sourice, S; Mercier, P

1999-03-01

415

Mechanisms of vein graft adaptation to the arterial circulation: Insights into the neointimal algorithm and management strategies  

PubMed Central

For patients with coronary artery disease or limb ischemia, placement of a vein graft as a conduit for a bypass is an important and generally durable strategy among the options for arterial reconstructive surgery. Vein grafts adapt to the arterial environment; limited formation of intimal hyperplasia in the vein graft wall is thought to be an important component of successful vein graft adaptation. However, it is also known that abnormal, or uncontrolled, adaptation may lead to abnormal vessel wall remodeling with excessive neointimal hyperplasia, and ultimately vein graft failure and clinical complications. Therefore, understanding the venous-specific pathophysiological and molecular mechanisms of vein graft adaptation are important for clinical vein graft management. Of particular importance, it is currently unknown whether several specific distinct molecular differences in venous mechanisms of adaptation exist that are distinct from arterial post-injury responses; in particular, the participation of the venous marker Eph-B4 and the vascular protective molecule Nogo-B may be involved in mechanisms of vessel remodeling specific to the vein. In this review, we describe 1) venous biology from embryonic development to the mature quiescent state; 2) sequential pathologies of vein graft neointima formation; and 3) novel candidates for strategies of vein graft management. We believe that the scientific inquiry of venous-specific adaptation mechanisms will ultimately provide improvements in vein graft outcomes. PMID:20606326

Muto, Akihito; Model, Lynn; Ziegler, Kenneth; Eghbalieh, Sammy D.D.; Dardik, Alan

2013-01-01

416

Recanalization of a single functioning kidney.  

PubMed

For patients with renal artery stenosis, percutaneous transluminal angioplasty is generally the treatment of choice. This report describes the case of an elderly lady with type III aortoarteritis whose right renal artery was successfully recalized and stented. There was satisfactory improvement in renal function and blood pressure post-procedure, and at one-month follow-up. PMID:16521653

George, Paul V; Pati, Purendra Kumar; Chandy, Sunil Thomas; Gupta, Satya; Samuel, Viji

2005-01-01

417

THC:YAG nasolacrimal duct recanalization.  

PubMed

In an early exploration of a new technique for creating a patent nasolacrimal duct system, a chromium-sensitized and thulium- and holmium-doped YAG laser was used to canalize the nasolacrimal duct of a fresh-frozen bisected human cadaver head. The laser--long-pulsed (300 milliseconds), compact, self-contained, and solid-state--operates in the near infrared range (2.1 microns). The technique involved passing a 550-micrometer quartz fiberoptic through the dilated superior punctum and canalicular system, down through the nasolacrimal duct. The quartz fiberoptic was then withdrawn into the area of the lacrimal sac. Pulse energies of 500 mJ were used at a repetition rate of five pulses per second to ablate the duct lining. The nasolacrimal duct was then unroofed and the epithelial lining of the duct histopathologically evaluated. PMID:8290219

Silkiss, R Z

1993-11-01

418

Hand veins feature extraction using DT-CNNS  

NASA Astrophysics Data System (ADS)

As the identification process is based on the unique patterns of the users, biometrics technologies are expected to provide highly secure authentication systems. The existing systems using fingerprints or retina patterns are, however, very vulnerable. One's fingerprints are accessible as soon as the person touches a surface, while a high resolution camera easily captures the retina pattern. Thus, both patterns can easily be "stolen" and forged. Beside, technical considerations decrease the usability for these methods. Due to the direct contact with the finger, the sensor gets dirty, which decreases the authentication success ratio. Aligning the eye with a camera to capture the retina pattern gives uncomfortable feeling. On the other hand, vein patterns of either a palm of the hand or a single finger offer stable, unique and repeatable biometrics features. A fingerprint-based identification system using Cellular Neural Networks has already been proposed by Gao. His system covers all stages of a typical fingerprint verification procedure from Image Preprocessing to Feature Matching. This paper performs a critical review of the individual algorithmic steps. Notably, the operation of False Feature Elimination is applied only once instead of 3 times. Furthermore, the number of iterations is limited to 1 for all used templates. Hence, the computational need of the feedback contribution is removed. Consequently the computational effort is drastically reduced without a notable chance in quality. This allows a full integration of the detection mechanism. The system is prototyped on a Xilinx Virtex II Pro P30 FPGA.

Malki, Suleyman; Spaanenburg, Lambert

2007-05-01

419

Circulating Progenitor and Mature Endothelial Cells in Deep Vein Thrombosis  

PubMed Central

Introduction: Mature circulating endothelial cells (CEC) and circulating endothelial progenitor cells (EPC) have been described in several conditions associated with endothelial injury. Their role in deep vein thrombosis (DVT) has not been previously evaluated. Patients and Methods: In this pilot study we evaluated the time course of CEC and EPC release after vena cava experimental DVT in mice, using the FeCl3 model. We also evaluated their presence in patients with DVT at different phases of the disease (acute and chronic phase). CEC and EPC were evaluated by Flow Cytometry. Results: In mice, both CEC and EPC were increased 24 hours after DVT induction, peaking 48 hours thereafter. After 72 hours, CEC counts decreased sharply, whereas EPC counts decreased less substantially. In DVT patients we observed a significant increase in CEC counts immediately after DVT compared to healthy individuals. Patients with chronic disease also presented a significant elevation of these cell count. In a subgroup of patients for whom serial samples were available, CEC counts decreased significantly after 9-15 months of the acute event. Conclusions: Our results suggest the participation of these cells in the reparative processes that follows DVT, both at immediate and late time-points. The different kinetics of CEC and EPC release in experimental DVT suggests a heterogeneous role for these cells in the reparative events after DVT. PMID:24155660

Alessio, Aline M; Beltrame, Miriam P; Nascimento, Mariane C Flores; Vicente, Cristina P; de Godoy, Juliana AP; Silva, Junia CR Santos; Bittar, Luis Fernando; Lorand-Metze, Irene; de Paula, Erich V; Annichino-Bizzacchi, Joyce M

2013-01-01

420

Comorbidities in combined retinal artery and vein occlusions  

PubMed Central

Background Several general diseases cause blindness in patients with simultaneous combined retinal artery and vein occlusion. Methods/patients We examined 14 patients with acute unilateral visual loss due to combined retinal artery and venous occlusions. All 14 patients presented at the Polyclinic over a period of about 3 years. Fluorescein angiography was carried out in 12 patients to confirm the diagnosis. Ten patients underwent Doppler sonography and 11 echocardiography. Results Concerning systemic diseases, 11 of our 14 patients presented several cardiovascular risk factors, i.e., immunocytoma and arterial hypertension and hypercholesterolemia in one patient; another patient had chronic bronchitis, tachycardia and hypercholesterolemia. Six patients presented coagulation anomalies, and eight patients had arterial hypertension. Doppler sonography revealed normal carotid arteries in nine of ten patients. In 8 of 11 patients, echocardiography displayed no cardiac abnormalities. Ophthalmoscopy revealed no emboli in any of these patients. Conclusion Unilateral simultaneous combined incomplete retinal artery and venous occlusions should be considered as one entity. Eleven of our patients presented comorbidities reflecting several cardiovascular risk factors. Immunological diseases, malignancies and coagulopathies can cause this ocular disorder, resulting in blindness. No emboli were found in any of these patients. Patients suffering from acute visual loss must be examined for the presence of systemic diseases to enable therapy at an early stage. PMID:23947749

2013-01-01

421

Optimal vein density in artificial and real leaves  

PubMed Central

The long evolution of vascular plants has resulted in a tremendous variety of natural networks responsible for the evaporatively driven transport of water. Nevertheless, little is known about the physical principles that constrain vascular architecture. Inspired by plant leaves, we used microfluidic devices consisting of simple parallel channel networks in a polymeric material layer, permeable to water, to study the mechanisms of and the limits to evaporation-driven flow. We show that the flow rate through our biomimetic leaves increases linearly with channel density (1/d) until the distance between channels (d) is comparable with the thickness of the polymer layer (?), above which the flow rate saturates. A comparison with the plant vascular networks shows that the same optimization criterion can be used to describe the placement of veins in leaves. These scaling relations for evaporatively driven flow through simple networks reveal basic design principles for the engineering of evaporation–permeation-driven devices, and highlight the role of physical constraints on the biological design of leaves. PMID:18599446

Noblin, X.; Mahadevan, L.; Coomaraswamy, I. A.; Weitz, D. A.; Holbrook, N. M.; Zwieniecki, M. A.

2008-01-01

422

Passive kimberlite intrusion into actively dilating dyke-fracture arrays: evidence from fibrous calcite veins and extensional fracture cleavage  

NASA Astrophysics Data System (ADS)

Calcite veins are invariably associated with en-echelon kimberlite dyke-fracture arrays. A detailed microstructural study of veining indicates four vein types. Type I stretched or ataxial veins are defined by high aspect ratio calcite fibers that are crystallographically continuous with calcite of the kimberlite matrix wall rock, by elongated phenocrystic phlogopite with sharp crystal terminations centered on contacts between adjacent calcite fibers and by phenocrystic phlogopite that grows or extends across these veins. Type I vein mineralogy indicates syn-dilational crystallization of vein minerals in local tensional areas within the kimberlite. Vein Types II (stretched to syntaxial elongate-blocky) and III (antitaxial) indicate late crystallization vein mineral growth during subsequent or repeated dilation. Calcite fibers in Type I to Type III veins are orthogonal to the contacts of their host dykes regardless of the orientation of vein margins. Type IV calcite veins, with blocky or mosaic/polycrystalline textures, are attributed to minor post-intrusion extension, which was potentially accompanied by repeated kimberlite intrusion within a given dyke array. Syn-crystallization/syn-intrusion Type I veins and an ubiquitous dyke-parallel fracture cleavage, in a zone up to 4 m on either side of dyke contacts, suggest that en-echelon kimberlite dyke-fracture arrays occupied the approximate center of zones of active dilation within the brittle carapace of the upper crust. Type II and III veins indicate that extension or dilation continued, independently of an occupying kimberlite fluid phase, after initial intrusion. Arrested mobile hydrofracturing, under low differential stress within the upper brittle or seismic carapace of the continental crust, followed by repeated dilation of the dyke-fracture system, is proposed as a mechanism for producing the features observed in this study. The conditions constrained in this study indicate passive dyke intrusion into dilating fracture arrays during crustal extension.

Basson, I. J.; Viola, G.

2004-09-01

423

Early Palma procedure after iliac vein injury in abdominal penetrating trauma.  

PubMed

Ligation for penetrating abdominal vein trauma may have better outcome than a vascular reconstruction in an unstable patient. However, symptoms of chronic venous insufficiency may appear over time. We describe our surgical experience with 4 patients who underwent iliac vein ligation followed by venous bypass with a modified Palma derivation between 48 and 240 hours after sustaining penetrating abdominal trauma with concomitant iliac vein injury. Patients were assessed for venous symptoms and conduit patency with continuous wave Doppler and duplex scanning. One graft occluded acutely and the remaining three remain patent with functioning valves. In order to preserve venous outflow after severe iliac vein injury, we think that venous ligation as a part of damage control surgery followed by a modified Palma operation may prevent chronic symptoms of venous outflow obstruction without compromising an already injured patient. PMID:18727974

Alcocer, Francisco; Aguilar, Jesus; Agraz, Salvador; Jordan, William D

2008-09-01

424

[Infra-fascial ligation of incompetent perforating veins for cure of varicose ulcer (author's transl)].  

PubMed

This is a series of 141 varicoses ulcers operated within 3 years (1971 to 1974), all with infra-fascial ligation of incompetent perforating veins (technique of Cockett-Linton). The author describes 3 combined methods used to obtain the most precise diagnosis of the venous insufficiency: A. Careful physical examination for axial or perforating imcompetence. B. Systematic phlebography for search of deep networks, of perforating veins and discovery of particular superficial venous networks. C. Ultrasonic Doppler technique for search of incompetent perforating veins. Surgical cure is described, based on this precise diagnosis, aiming at ligation of axial and of perforating veins under the fascia, level with the deep network. The results are encouraging as there were only 3 recurrences within 3 years after the 141 operations. These were reoperated after phlebographic control. PMID:1217426

Schoevaerdts, J C

1975-11-01

425

[The method of miniinvasive operation for varicosely-changed veins of gastric fundus].  

PubMed

The laparoscopic operation method was elaborated for prophylaxis arrest of hemorrhage, originated from varicosely-changed (VCH) veins of gastric fundus. Dissection and clipping of a. gastri-ca sinistra is performed and VCH gastric vein is transsected. After gastric fundus mobilization a laparoscopic suturing apparatus is applied on him and the fundus became resected. Additionally the sutures made of nonabsorbable threads are applied above the mechanical sutures line. The method was applied in 2 patients, suffering VCH gastroesophageal veins. Application of the proposed operative intervention method have permitted to reduce significantly the occurrence rate of purulent-septic complications. While follow-up prolong 24 - 30 months the hemorrhage recurrence was not revealed. Application of modem videoendoscopic methods of operation for VCH gastric veins permits to improve significantly the operation results and safety, to reduce the patients stationary treatment time. PMID:23705480

Grubnik, V Iu; Vorotyntseva, K O; Grubnik, V V

2013-02-01

426

Mineralogy and Microstructures of Shock-Induced Melt Veins in Chondrites  

NASA Technical Reports Server (NTRS)

The applicability of phase equilibrium data to the interpretation of shock-induced melt veins can only be tested by a detailed study of melt- vein mineralogy to see how high-pressure assemblages vary as a function of shock conditions inferred from other indicators. We have used transmission electron microscopy (TEM), analytical electron microscopy (AEM), scanning electron microscopy (SEM), electron microprobe analysis (EMA) and optical petrography to characterize the mineralogy, microstructures, and compositions of melt veins and associated high-pressure minerals in shocked chondrites and SNC meteorites. In the processes, we have gained a better understanding of what melt veining can tell us about shock conditions and we have discovered new mineral phases in chondritic and SNC meteorites.

Sharp, Thomas G.

2000-01-01

427

Laser-Doppler-anemometry studies of flow behavior in rigid and elastic varicose vein models.  

PubMed

Flow behavior and velocity were studied in six varicose vein models with simulated arteriovenous anastomoses (AVAs). Experiments were performed to determine whether incoming flow entering from AV-anastomoses or small feeder veins could create either small jet streams or velocity fluctuation, which might then cause veins to bulge and get tortuous. Flow was analyzed in areas of flow change. Studies were performed in rigid Plexiglas and elastic, silicon rubber models that exactly replicated the geometry and compliance of varicose veins. Flow was visualized with dyes for steady flow and with a birefringent solution for pulsatile flow studies. Local velocity was measured with a laser-Doppler-anemometer (LDA). Very low forces and shear stresses were found on the interior wall opposite the entrance of the simulated AV anastomoses. However, these values were ten times that of an idealized flow in a straight tube without added flow from simulated AV anastomoses. PMID:11673670

Schalin, L; Liepsch, D

2001-01-01

428

Research of the types of applicable people and the statistical characteristics of hand vein image  

NASA Astrophysics Data System (ADS)

Hand vein image has been widely used in biological recognition, auxiliary medical and other fields. People with age, height, weight, gender differences have distinction in fat thickness of the back of hand, so the contrast and sharpness of their hand vein images are different too, which may affect the results of applications. In this paper, a hand vein image acquisition system is given and the hand vein images of people from the age of 3 to 60 are obtained in various conditions. The effect on the images caused by ages, genders, BMI (body mass index) and FMI (fat mass index) are researched and the statistical characteristics of the images are analyzed. The types of applicable people are also proposed for applications.

Yang, Haifeng; Yang, Xiaoping; Xu, Wuchao; Yao, Shuyu; Wei, Chongchong; Qu, Huinan; Qu, Bingguang

2014-11-01

429

Suprahepatic vein oxygen tension in alcoholics with severe and mild liver damage.  

PubMed

We measured suprahepatic vein and arterial partial oxygen pressure in 35 alcoholics with severe (N = 7) or mild (N = 28) histological liver damage and without evidence of clinical liver failure. The suprahepatic vein was punctured with a fine needle, using a percutaneous approach. Suprahepatic vein partial oxygen pressure was lower and arterial-suprahepatic gradient higher in alcoholics with severe liver damage compared to those with mild damage (35.1 +/- 1.7 vs 44.1 +/- 2.1 and 58.9 +/- 3.7 vs 45.9 +/- 2.4 mm Hg, respectively; P < 0.001). Suprahepatic puncture was well tolerated and devoid of complications. It is concluded that alcoholics with severe liver damage have lower oxygen tensions in the suprahepatic vein, a phenomenon that supports the hypoxic theory of alcoholic liver disease. PMID:7781440

Bunout, D; Moya, P; de la Maza, M P; Petermann, M; Iturriaga, H; Hirsch, S

1995-06-01

430

INTERACTIONS OF HUMAN UMBILICAL VEIN ENDOTHELIAL CELLS WITH TOBACCO TREATED STREPTOCOCCUS MUTANS  

E-print Network

INTERACTIONS OF HUMAN UMBILICAL VEIN ENDOTHELIAL CELLS WITH TOBACCO TREATED STREPTOCOCCUS MUTANS Vinayak Gupta1 , L. Jack Windsor1 , Fengyu Song1 , and Richard Gregory1 Streptococcus mutans (S. mutans

Zhou, Yaoqi

431

Absence of infra-renal segment of inferior vena cava with anomalous right renal vein  

PubMed Central

Various anomalies of the inferior venacava (IVC) have been reported in the past. Amongst, the absence of IVC is one of the less frequently reported anomalies. The absence can be complete or partial, confined to the hepatic, supra-renal or infra-renal segment of IVC. It is still a controversy, whether these conditions are true embryonic anomalies or the result of perinatal IVC thrombosis. A man in his mid 30’s presented with absence of the infra-renal IVC and both common iliac veins. The right renal vein is replaced by a long tortuous vessel, similar to the appearance of collateral vessel. He presented with extensive varicose veins on the anterior abdominal wall, severe varices of right leg with ulcer. A coronal multiplanar reconstruction CT imaging was used to document the anomaly. Prior knowledge of this anomaly is vital, especially if these individuals are subjected to undergo cardiac procedures via femoral vein access. PMID:24960739

Ajay-Chandrasekar, VS; Kaliyaperumal, V; Alfred, D

2012-01-01

432

Petrogenesis of complex veins in the Chantonnay /L6f/ chondrite  

NASA Astrophysics Data System (ADS)

Two cross-cutting veins in the Chantonnay (L6f) chondrite illustrate different patterns of fractionation of total chondritic shock melts. The earlier vein, which is dark-colored and bears abundant host rock xenoliths, is strongly reduced and sodium-poor relative to the bulk meteorite. It resembles and may be cogenetic with melt pockets in Chantonnay. The later vein, which is lighter-colored and somewhat vesicular, lacks evidence of either Na loss or reduction but shows modest internal differentation. Its metal and total iron contents (26.5 wt.%) are higher than normal for L-group chondrites. The trend of chemical fractionation recorded in the earlier Chantonnay vein resembles that reported for chondrules in ordinary chondrites, suggesting that chemical variations among chondrules in part reflect variations among their parental shock melts.

Dodd, R. T.; Jarosewich, E.; Hill, B.

1982-07-01

433

Plasmodial vein networks of the slime mold Physarum polycephalum form regular graphs  

NASA Astrophysics Data System (ADS)

The morphology of a typical developing biological transportation network, the vein network of the plasmodium of the myxomycete Physarum polycephalum is analyzed during its free extension. The network forms a classical, regular graph, and has exclusively nodes of degree 3. This contrasts to most real-world transportation networks which show small-world or scale-free properties. The complexity of the vein network arises from the weighting of the lengths, widths, and areas of the vein segments. The lengths and areas follow exponential distributions, while the widths are distributed log-normally. These functional dependencies are robust during the entire evolution of the network, even though the exponents change with time due to the coarsening of the vein network.

Baumgarten, Werner; Ueda, Tetsuo; Hauser, Marcus J. B.

2010-10-01

434

Occurrence of a Begomovirus with yellow vein mosaic disease of mesta ( Hibiscus cannabinus and Hibiscus sabdariffa )  

Microsoft Academic Search

A whitefly transmitted Begomovirus (Geminiviridae: Begomovirus) with a satellite (?-DNA associated with yellow vein mosaic disease of mesta (Hibiscus cannabinus and Hibiscus sabdariffa) has been detected for the first time in mesta growing regions of India.

A. Chatterjee; A. Roy; K. V. Padmalatha; V. G. Malathi; S. K. Ghosh

2005-01-01

435

Quartz-molybdenite veins in the Priestly Lake granodiorite, north-central Maine  

USGS Publications Warehouse

Quartz-molybdenite veins up to 15 cm in width occur in fine to medium-grained porphyritic biotite-hornblende granodiorite at Priestly Lake north-central Maine. An area of about 150 m x 150 m contains quartz-molybdenite veins; a larger area is characterized by barren quartz veins. Quartz-molybdenite veins are concentrated within the most felsic variants of the intrusion as suggested by lower mafic mineral contents. The pluton has a narrow range in SiO2 (67-70 wt.%), major oxides, and in trace-element compositions. Molybdenite occurs as coarse grained clusters in pockets within the quartz veins, and fills fractures in the quartz veins and host rocks. Disseminated molybdenite in the granodiorite is relatively rare and occurs only in the area characterized by a high density of quartz veins (up to 50 veins per square meter). Alteration envelopes along the quartz veins are very thin or absent, although in some areas the granodiorite appears to be selectively and pervasively altered. Sericite, chlorite, epidote, calcite, pyrite, and quartz are concentrated near the quartz-molybdenite veins. Many of the field and geochemical characteristics of the Priestly Lake pluton are unlike those of major molybdenum-producing areas (Climax, Henderson, Urad). For example, the area of alteration seems to be of limited extent, the host rock is not intensely altered hydrothermally at the surface, the density of fractures is rather low in the mineralized area, and the amount of disseminated molybdenite appears to be small. However, the Priestly Lake pluton may be a small fraction of a concealed batholith as suggested by geophysical data. It is conceivable that the type of mineralization at the surface might be the expression of more extensive molybdenite mineralization at depth. The quartz-molybdenite veins in the Priestly Lake pluton are significant because they indicate that potential molybdenum sources for producing mineralized granites were available at depth. Future studies should be aimed at delineating the area of quartz-molybdenite mineralization, documenting hydrothermal alteration and zonation, determining fracture density, and evaluating the sulfide assemblage.

Ayuso, Robert A.; Shank, Stephen G.

1983-01-01

436

Pressure-flow characteristics and nutritional capacity of coronary veins in dogs  

Microsoft Academic Search

To examine the hemodynamic interdependence of coronary arteries and veins, great cardiac vein (GCV) and left anterior descending (LAD) coronary artery flows of dogs were measured. Although they were not different under base-line conditions, 42.9 +\\/- 4.1 and 34.9 +\\/- 5.2 ml\\/min, respectively, LAD occlusion caused only a 56% decrease in GCV flow, whereas peak GCV flow during reactive hyperemia

M. V. Cohen; T. Matsuki; J. M. Downey

1988-01-01

437

Surgical Stapler for Right Renal Vein Elongation Using the Inferior Vena Cava in Kidney Transplant.  

PubMed

Elongation of the right renal vein with the inferior vena cava (caval patch) using a vascular stapler offers a safe means of extending the deceased-donor right renal vein, while minimizing the ischemic time of the kidney during preparatory dissection. The aortic patch of the right renal artery also can be preserved, which minimize the danger of arterial stenosis, kinking, and dissection. PMID:25233447

Di Cocco, Pierpaolo; Kandilis, Apostolos; Rajagopal, Poyyamozhi; Herbert, Paul; Hassen, Yasmin; Hakim, Nadey

2014-09-17

438

The Mathematical Treatment of Leaf Venation: the Variation in Secondary Vein Length along the Midrib  

Microsoft Academic Search

d Background and Aims In some dicotyledonous leaves and leaflets, the secondary veins run more-or-less straight to the margins and have well-defined lengths. For a given half-lamina of length L, an equation, previously pro- posed, relates the lengths of these veins, p, to the distances, l, between the leaf tip and their insertions on the midrib: p=B 2 x+ylx(L -

RICHARD F. BURTON

2004-01-01

439

Endovascular Coil Embolization in a Postnephrostomy Renal Vein to Renal Pelvis Fistula  

SciTech Connect

We report the case of a 74-year-old man with post-percutaneous-nephrostomy venous hemorrhage from an iatrogenic fistula between the renal pelvis and a large tributary of the renal vein. Conservative management failed to contain the hemorrhage. Hence the fistula was occluded by coil embolization through the renal vein. This endovascular approach enabled rapid and effective stoppage of the venous bleed.There was no recurrence of the bleed or any pertinent complication at 3-month follow-up.

Anil, Gopinathan, E-mail: ivyanil10@gmail.com; Taneja, Manish [Singapore General Hospital, Department of Radiology (Singapore)

2011-02-15

440

The effect of long saphenous vein stripping on quality of life  

Microsoft Academic Search

Purpose: Long saphenous vein (LSV) stripping in the treatment of varicose veins may reduce the recurrence of varices but may also increase morbidity rates. The effect of stripping on health-related quality of life (HRQoL) is unknown. The aim of this study was to examine the effect of LSV surgery, with and without successful stripping, on HRQoL. Methods: This prospective study

R. K. MacKenzie; A. Paisley; P. L. Allan; A. J. Lee; C. V. Ruckley; A. W. Bradbury

2002-01-01

441

Effect of Image Processing of a Leaf Photograph on the Calculated Fractal Dimension of Leaf Veins  

Microsoft Academic Search

Digital photography is a promised method for estimating the fractal characteristics of leaf veins. In this study, the effects\\u000a of different threshold levels and image processing methods using Adobe Photoshop software on the fractal dimension values\\u000a were examined from a digital photo of nectarine leaf. The results showed that the nectarine leaf vein has typical fractal\\u000a characteristics and its fractal

Yun Kong; Shaohui Wang; Chengwei Ma; Baoming Li; Yuncong Yao

2007-01-01

442

Effects of adrenergic and cholinergic drugs on splenic arteries and veins from hooded seals ( Cystophora cristata)  

Microsoft Academic Search

Isolated ring preparations of arteries and veins from hooded seal spleens were subjected in vitro to adrenaline (A), noradrenaline (NA), isoprenaline (Iso), and acetylcholine (ACh), alone or in combination with the blockers phentolamine (Phe), propranolol (Pro), and atropine (A