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1

Combined Transabdominal and Transjugular Recanalization of Thrombosed TIPS, Portal and Proximal Splenic Veins  

SciTech Connect

We present a case of TIPS occlusion in which a small caliber transhepatic safety or anchoring wire in combination witha standard transjugular approach were utilized to recanalize the TIPS,portal and splenic veins. This technique may be a useful adjunct to the typical methods used for recanalization of thrombosed TIPS, portal and splenic veins without the need of large caliber transhepatic sheath access.

Bloss, M.F. [DartmouthHitchcock Medical Center, One Medical Center Dr, Lebanon, NH03756, Department of Radiology (United States); Lenz, J. [Veterans Administration Hospital, White RiverJunction, VT 05001, Department ofRadiology (United States); Gemery, J. [DartmouthHitchcock Medical Center, One Medical Center Dr, Lebanon, NH03756, Department of Radiology (United States)

2003-04-15

2

Mid-term follow-up after retrograde recanalization of chronically occluded saphenous vein graft.  

PubMed

We reported a case of 55-year-old male with an ostial chronically occluded saphenous vein graft which was recanalized by retrograde approach through an epicardial collateral channel with implantation of three drug eluting stents. Six-month coronary angiography showed the patency of graft and distal native vessel diameter enhancement. PMID:20151140

Galassi, Alfredo R; Tomasello, Salvatore D; Costanzo, Luca; Tamburino, Corrado

2010-04-01

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

Paraumbilical hernia repair during cesarean delivery  

PubMed Central

BACKGROUND AND OBJECTIVES: Pregnant women with paraumbilical hernia usually postpone hernia repair until after delivery, but some patients request that it be done during cesarean delivery. Therefore, we evaluated the outcome of combined cesarean delivery and paraumbilical hernia repair in a prospective study at a tertiary referral university hospital. PATIENTS AND METHODS: In a prospective study, we compared the outcome of 48 patients undergoing cesarean delivery combined with paraumbilical hernia repair versus 100 low-risk patients undergoing cesarean delivery alone. The main outcome measures were operation time, blood loss, severity of pain, peripartum complications, hospital stay, hernia recurrence, and patient satisfaction. RESULTS: The combined procedure took significantly longer than cesarean delivery alone (75.2 minutes versus 60.5 minutes, P<.001)). There were no major complications. Wound infection occurred in 6 patients (4.1%). Hospital stay did not differ significantly from those of controls. Pain at the hernia site repair occurred in two patients, and one hernia recurred in the hernia repair group during a mean follow-up period of 22 months (range, 6-36 months). All hernia patients reported that they preferred the combined operation. CONCLUSIONS: Combined cesarean delivery and paraumbilical hernia repair had the advantage of a single incision, single anesthesia, and a single hospital stay while avoiding re-hospitalization for a separate hernia repair. Our results indicate that the combination approach is safe, effective, and well accepted. PMID:19318752

Ghnnam, Wagih M.; Helal, Adel S.; Fawzy, Muhammad; Ragab, Ahmed; Shalaby, Hend; Elrefaay, Ehsan

2009-01-01

5

Successful recanalization of late portal vein thrombosis after liver transplantation using systemic low-dose recombinant tissue plasminogen activator  

Microsoft Academic Search

Portal vein thrombosis (PVT) is an infrequent complication following hepatic transplantation. However, deterioration of liver\\u000a function and accompanying complications may be life threatening. Several attempts of surgical or percutaneous transhepatic\\u000a procedures have been described. In some cases high dose fibrinolytic regimens have been successful. We describe the case of\\u000a a male liver recipient with recurrent liver fibrosis due to hepatitis

Olaf Guckelberger; Wolf O. Bechstein; Jan M. Langrehr; Bernd Kratschmer; Juergen Loeffel; Utz Settmacher; Ruth Neuhaus; Enrique Lopez Haenninen; Stephan Venz; Thomas J. Vogl; Peter Neuhaus

1999-01-01

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

Novel treatment techniques for recanalization of femoral-popliteal deep venous occlusion from chronic thrombosis.  

PubMed

Patients with postthrombotic syndrome due to previous femoral-popliteal deep venous thrombosis often experience lifestyle-limiting lower-extremity pain and swelling. Conservative treatment options include compression stockings and lymphedema massage, but in many cases these treatments only temporarily and partially improve symptoms. Ultrasound and venography in patients with postthrombotic syndrome often show only partial recanalization of the femoral vein with significant collateral vein formation. These abnormal veins are insufficient for adequate venous drainage from the lower extremity as evidenced by the patient's continued symptoms. Recanalization of the occluded or partially occluded femoral vein using prolonged venoplasty, with or without chemical thrombolysis, combined with optimizing anticoagulation and conservative treatment measures, results in lasting improvement in symptoms for a high percentage of patients. PMID:24840967

Spencer, Elizabeth Brooke; Stratil, Peter; Mizones, Heidi

2014-06-01

8

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

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

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

11

Transjugular approach for successful recanalization and stenting for inferior vena cava stenosis.  

PubMed

Budd-Chiari syndrome is a rare disease characterized by obstruction of outflow in the hepatic vein and/or the inferior vena cava (IVC). Percutaneous transluminal angioplasty and stent placement is nowadays considered to be the first-line treatment for central venous disease because of its minimal-invasive approach. IVC reconstruction by surgical approach is not preferred due to increased morbidity and disappointing patency rates. We describe a case of a long-segment, thrombotic, chronic total occlusion of the IVC that was dilated and stented using a recanalization technique involving the use of Brokenborough septal puncture needle, Mullin dilator and Accura balloon from the jugular approach. PMID:23435836

Srinivas, Budanur Chikkaswamy; Singh, Ajit Pal; Nagesh, C M; Reddy, Babu; Manjunath, C Nanjappa

2013-07-01

12

Recanalization and Reperfusion Therapies for Acute Ischemic Stroke  

Microsoft Academic Search

Arterial recanalization and subsequent reperfusion have extensively demonstrated the ability to restore the brain function when performed shortly after acute ischemic stroke. Experimental and human studies have consistently demonstrated that early tissue reperfusion may limit ischemic tissue enlargement, leading to a reduced infarct size and favorable clinical outcome. However, arterial recanalization does not necessarily lead to brain tissue reperfusion. Lack

Carlos A. Molina; José Alvarez-Sabín

2009-01-01

13

Spider Veins  

MedlinePLUS

... damaged Skin Unwanted Hair Unwanted Tattoos Varicose Veins Vitiligo Wrinkled Skin Treatments and Procedures Ambulatory Phlebectomy Blepharoplasty ... damaged Skin Unwanted Hair Unwanted Tattoos Varicose Veins Vitiligo Wrinkled Skin Treatments and Procedures Ambulatory Phlebectomy Blepharoplasty ...

14

Vein Problems Related to Varicose Veins  

MedlinePLUS

... varicose veins include venous lakes, reticular veins, and hemorrhoids. Venous lakes are varicose veins that appear on ... flat blue veins often seen behind the knees. Hemorrhoids are varicose veins in and around the anus. ...

15

Patterns of recurrent disease after recanalization of femoropopliteal artery occlusions  

Microsoft Academic Search

Purpose  In this prospective study we investigated the site, occurrence, and development of stenoses and occlusions following recanalization\\u000a of superficial femoral artery occlusions.\\u000a \\u000a \\u000a \\u000a Methods  Recanalization of an occluded femoropopliteal artery was attempted in 62 patients. Follow-up examinations included clinical\\u000a examination and color-flow duplex scanning at regular intervals. Arteriography was used to determine the localization of the\\u000a recurrent disease relative to the initially

Dammis Vroegindeweij; Alexander V. Tielbeek; Jaap Buth; Louwerens D. Vos; Harrie C. M. van den Bosch

1997-01-01

16

Endovascular Sharp Recanalization for Calcified Femoropopliteal Artery Occlusion  

PubMed Central

Endovascular intervention of peripheral chronic total occlusion (CTO) is technically challenging and time consuming. Various techniques and devices are used to facilitate lesion crossing and improve the success rate of the procedure. However, these new devices are quite expensive and not readily available. We report 2 cases of peripheral CTO wherein the occlusions were successfully crossed by using stiff end of Terumo glidewire. This sharp recanalization may be a useful technique for the recanalization of calcified peripheral CTOs when conventional techniques fail and new devices are not readily available, but it is accompanied by the risk of distal atheroembolism. PMID:24826257

Huang, Hsuan-Li; Chou, Hsin-Hua; Wu, Tien-Yu

2012-01-01

17

Deep vein thrombosis detection by 99m TC-MDP scanning  

SciTech Connect

A new observation is reported wherein 99m Tc-MDP is incorporated into recanalizing thrombophlebitis. In one patient with subacute disease, inflammatory vascularity is appreciated during the first one to two minutes after injection. Both patients showed evidence of late phosphate uptake in their greater saphenous veins two hours later. Intravenous isotope injections may be given in an arm vein: foot injections are not required.

Moallem, A.; Lichsztral, R.

1984-08-01

18

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

PubMed

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

2014-07-27

19

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

20

Transvaginal fluoroscopic recanalization of a proximally occluded oviduct  

Microsoft Academic Search

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.

M. P. Platia; A. G. Krudy

1985-01-01

21

Clinical Outcome after Mechanical Recanalization as Mono or Adjunctive Therapy in Acute Stroke: Importance of Time to Recanalization  

Microsoft Academic Search

Background: The clinical benefit of mechanical recanalization procedures for acute stroke is still a matter of debate. We report the clinical and imaging results of 34 consecutive patients, focusing on time aspects (i.e. vessel occlusion time and procedure duration). Methods: During a 3-year period, 34 stroke patients with large-vessel occlusion (anterior circulation, n = 19; posterior circulation, n = 15)

Jos S. Becktepe; Se-Jong You; Joachim Berkefeld; Tobias Neumann-Haefelin; Oliver C. Singer

2011-01-01

22

Varicose veins  

PubMed Central

Introduction Varicose veins are caused by poorly functioning valves in the veins, and decreased elasticity of the vein wall, allowing pooling of blood within the veins, and their subsequent enlargement. Varicose veins affect up to 40% of adults, and are more common in obese people, and in women who have had more than two pregnancies. Methods and outcomes We conducted a systematic review and aimed to answer the following clinical question: What are the effects of treatments in adults with varicose veins? We searched: Medline, Embase, The Cochrane Library and other important databases up to January 2010 (Clinical Evidence reviews are updated periodically, please check our website for the most up-to-date version of this review). We included harms alerts from relevant organisations such as the US Food and Drug Administration (FDA) and the UK Medicines and Healthcare products Regulatory Agency (MHRA). Results We found 39 systematic reviews, RCTs, or observational studies that met our inclusion criteria. We performed a GRADE evaluation of the quality of evidence for interventions. Conclusions In this systematic review we present information relating to the effectiveness and safety of the following interventions: compression stockings, endovenous laser, injection sclerotherapy, radiofrequency ablation, self-help (advice, avoidance of tight clothing, diet, elevation of legs, exercise), and surgery (stripping, avulsion, powered phlebectomy). PMID:21477400

2011-01-01

23

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.

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

2014-01-01

24

Pull-through technique for recanalization of occluded portosystemic shunts (TIPS): technical note and review of the literature.  

PubMed

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. PMID:20440498

Tanaka, Toshihiro; Günther, Rolf W; Isfort, Peter; Kichikawa, Kimihiko; Mahnken, Andreas H

2011-04-01

25

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

26

Radiographic fallopian tube recanalization: absorbed ovarian radiation dose.  

PubMed

Absorbed radiation dose to the ovaries during radiographic fallopian tube recanalization was estimated in 29 patients with use of thermoluminescent dosimeters placed in the vaginal fornix. With an average fluoroscopic time of 8.5 minutes +/- 5.5 and an average of 14 +/- 5 105-mm spot radiographs obtained, the average absorbed dose to the ovaries was 8.5 mGy +/- 5.6 (0.85 rad +/- 0.56). Technical guidelines for keeping patient radiation exposure to a minimum during this new interventional procedure are suggested. PMID:2052677

Hedgpeth, P L; Thurmond, A S; Fry, R; Schmidgall, J R; Rösch, J

1991-07-01

27

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

28

Duplex scans before subclavian vein catheterization predict unsuccessful catheter placement.  

PubMed

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

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

1992-02-01

29

Successful Endovascular Treatment of Iliac Vein Compression (May-Thurner) Syndrome in a Pediatric Patient  

SciTech Connect

A 10-year-old boy presented to our clinic with left lower extremity swelling present for 1 year with deterioration of symptoms during the prior month. Laboratory investigation for deep vein thrombosis was negative. Venography and computed tomography scan of the pelvis showed compression of the left common iliac vein by the right common iliac artery. A diagnosis of iliac vein compression syndrome was made. After venography, endovascular treatment was planned. The stenosis did not respond to balloon dilatation and a 12 mm Wallstent was placed with successful outcome. The patient's symptoms improved but did not resolve completely, probably due to a chronically occluded left superficial femoral vein that did not respond to endovascular recanalization. To the best of our knowledge, this is the first case of successful endovascular treatment of iliac vein compression syndrome with stent placement in a pediatric patient.

Oguzkurt, Levent, E-mail: loguzkurt@yahoo.com; Tercan, Fahri [Baskent University, Adana Teaching and Medical Research Center, Department of Radiology (Turkey); Sener, Mesut [Baskent University, Adana Teaching and Medical Research Center, Department of Anesthesiology and Reanimation (Turkey)

2006-06-15

30

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

31

Unilateral Thrombosis of a Deep Cerebral Vein Associated with Transient Unilateral Thalamic Edema  

PubMed Central

Symptoms of deep cerebral vein thrombosis (DCVT) are variable and nonspecific. Radiologic findings are essential for the diagnoses. In the majority of cases of deep internal cerebral venous thrombosis, the thalamus is affected bilaterally, and venous hypertension by thrombosis causes parenchymal edema or venous infarction and may sometimes cause venous hemorrhage. Intravenous injections of mannitol can be administered or decompressive craniectomy can be performed for reduction of intracranial pressure. The objectives of antithrombotic treatment in DCVT include recanalization of the sinus or vein, and prevention of propagation of the thrombus. Herein, the authors report DCVT which was successfully treated by low molecular weight heparin. PMID:23210053

Chung, Sang Won; Min, Byoung Kook; Kwon, Jeong Taik; Nam, Taek Kyun; Lee, Byoung Hoon

2012-01-01

32

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

33

Relief of Buttock Claudication by Percutaneous Recanalization of an Occluded Superior Gluteal Artery  

SciTech Connect

We report a case of a woman presenting with right severe buttock claudication and normal neurological and osteoarticular examination, in whom a guidewire recanalization and percutaneous transluminal angioplasty (PTA) of an occluded right superior gluteal artery (SGA) has provided relief of her symptoms. To our knowledge, this is the first report of percutaneous recanalization of the SGA. PTA can be considered the treatment of choice for buttock claudication caused by SGA stenosis or occlusion.

Senechal, Quentin; Auguste, Mario C.; Louail, Bertrand; Lagneau, Pierre; Pernes, Jean Marc [Service de Radiologie Cardio-Vasculaire, Hopital prive la Providence, 25 avenue Providence, F-92160 Antony (France)

2000-03-15

34

Thrombolytic Therapy of Acute Ischemic Stroke: Correlation of Angiographic Recanalization with Clinical Outcome  

Microsoft Academic Search

BACKGROUND AND PURPOSE: The effect of vessel patency, following recombinant tissue plasminogen activator (rtPA) administration, on clinical outcome in acute ischemic stroke (AIS) has been controversial. We studied the effect of recanalization following intraarterial (IA) and intravenous\\/IA (IV\\/IA) rtPA on clinical outcome in AIS. METHODS: Recanalization was classified angiographically as complete (as compared with unoccluded vessel, thrombolysis in myocardial infarction

Osama O. Zaidat; Jose I. Suarez; Jeffrey L. Sunshine; Robert W. Tarr; Michael J. Alexander; Tony P. Smith; David S. Enterline; Warren R. Selman; Dennis M. D. Landis

35

Distal neuroprotection system as option for right subclavian artery ostial recanalization  

PubMed Central

We present the case of a 49-year-old woman with neurological symptoms and severe atherosclerosis of aortic arch branches affecting subclavian and carotid arteries. Our patient has a history of transient ischemic attack and recurrent paresthesias of her right arm. We present a double access intervention using a distal embolic neuroprotection device during ostial right subclavian artery recanalization. We recommend that use of an embolic protection device in right subclavian artery ostial recanalization should be considered. PMID:24570750

Pieniazek, Piotr; Zasada, Jakub; Brzychczy, Andrzej; Nessler, Jadwiga; Zmudka, Krzysztof

2013-01-01

36

Effect of coronary artery recanalization on right ventricular function in patients with acute myocardial infarction  

SciTech Connect

The effects of coronary artery recanalization by intracoronary administration of streptokinase on left ventricular function during acute myocardial infarction have received increasing attention in recent years. Although myocardial dysfunction is often more pronounced in the right ventricle than in the left ventricle in patients with acute inferior wall myocardial infarction, the effect of coronary artery recanalization on right ventricular dysfunction has not been previously addressed. Accordingly, in this investigation, 54 patients who participated in a prospective, controlled, randomized trial of recanalization during acute myocardial infarction were studied. Among 30 patients with inferior wall infarction, 19 had right ventricular dysfunction on admission; 11 of these 19 had positive uptake of technetium-99m pyrophosphate in the right ventricle, indicative of right ventricular infarction. Patients with successful recanalization exhibited improved right ventricular ejection fraction from admission to day 10. However, control patients and patients who did not undergo recanalization also exhibited improvement. These data indicate that the right ventricular dysfunction commonly associated with inferior wall infarction is often transient, and improvement is the rule, irrespective of early recanalization of the infarct vessel.

Verani, M.S.; Tortoledo, F.E.; Batty, J.W.; Raizner, A.E.

1985-05-01

37

Portal vein thrombosis; risk factors, clinical presentation and treatment  

PubMed Central

Background Portal vein thrombosis (PVT) is increasingly frequently being diagnosed, but systematic descriptions of the natural history and clinical handling of the condition are sparse. The aim of this retrospective study was to describe risk factors, clinical presentation, complications and treatment of portal vein thrombosis in a single-centre. Methods Sixty-seven patients were identified in the electronic records from 1992 to 2005. All data were obtained from the patient records. Results One or more risk factors (e.g. prothrombotic disorder or abdominal inflammation) were present in 87%. Symptoms were abdominalia, splenomegaly, fever, ascites, haematemesis, and weight loss. Abdominalia and fever occurred more frequently in patients with acute PVT. Frequent complications were splenomegaly, oesophageal- and gastric varices with or without bleeding, portal hypertensive gastropathy and ascites. Varices and bleeding were more frequent in patients with chronic PVT. Patients who received anticoagulant therapy more frequently achieved partial/complete recanalization. Patients with varices who were treated endoscopically in combination with ?-blockade had regression of the varices. The overall mortality was 13% in one year, and was dependent on underlying causes. Conclusion Most patients had a combination of local and systemic risk factors for PVT. We observed that partial/complete recanalization was more frequent in patients treated with anticoagulation therapy, and that regression of varices was more pronounced in patients who where treated with active endoscopy combined with pharmacological treatment. PMID:17697371

Sogaard, Kirstine K; Astrup, Lone B; Vilstrup, Hendrik; Gronbaek, Henning

2007-01-01

38

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

39

Percutaneous Recanalization of Acute Internal Carotid Artery Occlusions in Patients with Severe Stroke  

SciTech Connect

Background. Sudden symptomatic occlusions of the proximal internal carotid artery (ICA) resulting in severe middle cerebral artery (MCA) ischemia and stroke are usually not accessible by rt-PA thrombolysis and the prognosis is usually very poor. Mechanical recanalization of the proximal ICA combined with intravenous and intra-arterial thrombolysis was therefore used as a rescue procedure. Methods. Ten patients (9 men, 1 woman; mean age 56.1 years) were treated with emergency recanalization of the proximal carotid artery by using stents and/or balloon angioplasty as a rescue procedure. Three patients showed dissection, and 7 had atherothrombotic occlusions. Nine of 10 presented with an initial modified Rankin Scale (mRS) of 5, the remaining patient with mRS 4 (average NIHSS 21.4). After sonographic confirmation of ICA with associated MCA/distal ICA occlusion and bridging with rt-PA (without abciximab) an emergency angiography was performed with subsequent mechanical recanalization by percutaneous transluminal angioplasty (PTA) (n = 1) or primary stenting (n = 9) using self-expanding stents. Distal protection was used in 1 of 10 patients. Results. Recanalization of the proximal ICA was achieved in all. At least partial recanalization of the intracerebral arteries was achieved in all, and complete recanalization in 5. In 4 of 10 patients limited hemorrhage was detected during CT controls. Major complications included 2 patients who had to undergo hemicraniectomy. One patient died from malignant infarction. At the time of discharge from the stroke unit 9 of 10 patients had improved markedly, 5 patients having an mRS of {<=}2, and 3 patients a mRS of 3. At control after a mean of 20 weeks, 7 of 8 (88%) patients had a mRS {<=}2, and 1 a mRS of 3. Conclusions. Primary mechanical recanalization of ICA occlusions by stent and PTA combined with fibrinolysis and/or GPIIb/IIIa-receptor antagonists seems to be feasible to improve patient outcome significantly.

Dabitz, Rainer [Klinikum Ingolstadt, Department of Neurology (Germany); Triebe, Stefan [Klinikum Ingolstadt, Department of Diagnostic and Interventional Radiology (Germany); Leppmeier, Ullrich; Ochs, Guenther [Klinikum Ingolstadt, Department of Neurology (Germany); Vorwerk, Dierk [Klinikum Ingolstadt, Department of Diagnostic and Interventional Radiology (Germany)], E-mail: dierk.vorwerk@klinikum-ingolstadt.de

2007-02-15

40

Deep Vein versus Pseudo Deep Vein Thrombosis  

PubMed Central

An acutely swollen, painful calf is usually caused by deep vein thrombosis or pseudo deep vein thrombosis; however, the differential diagnosis and management of these 2 entities can prove difficult and even hazardous unless a careful, systematic approach is used. This article describes the use of 2 invasive techniques (ascending venography and arthrography) and several noninvasive methods (magnetic resonance imaging, computerized axial tomography, and non-Doppler ultrasound) to differentiate between deep vein thrombosis and pseudo deep vein thrombosis. The author discusses a practical, cost-effective approach to diagnosing and managing the acutely swollen, painful calf. (Texas Heart Institute Journal 1989;16:280-6) Images PMID:15227382

Ansari, Azam

1989-01-01

41

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.

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

2014-01-01

42

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

43

Optociliary veins and central retinal vein occlusion  

Microsoft Academic Search

In a follow up of 94 patients with central retinal vein occlusion (CRVO) whose onset had taken place less than 1 year earlier, optociliary veins (OCVs) were found in 7.4% at first examination. Among the 79 eyes in which the fundus of the eye was very visible after a follow up of more than 1 year OCVs were found in

G Giuffrè; C Palumbo; G Randazzo-Papa

1993-01-01

44

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

45

Balloon Occlusion of the Contralateral Iliac Artery to Assist Recanalization of the Ipsilateral Iliac Artery in Total Aortoiliac Occlusion: A Technical Note  

PubMed Central

Endovascular recanalization of chronic total aortoiliac occlusion is technically challenging. Inability to reenter the true aortic lumen, following retrograde iliac recanalization, is one of the most common causes of failure. We describe a case of a total aortoiliac occlusion where balloon occlusion of the right common iliac artery, following its recanalization from a brachial approach, was used to facilitate antegrade recanalization of the occluded contralateral left common iliac artery. PMID:23762730

Jaffan, Abdel Aziz A.

2013-01-01

46

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

47

Subacute Recanalization and Reocclusion in Patients with Acute Ischemic Stroke Following Endovascular Treatment  

Microsoft Academic Search

Objective  To determine the rate of subacute recanalization and reocclusion and its effect on clinical outcomes among patients with ischemic\\u000a stroke treated with endovascular treatment. Subacute recanalization and reocclusion occurring hours after completion of the\\u000a intravenous or intra-arterial thrombolysis for acute ischemic stroke has been reported in anecdotal cases.\\u000a \\u000a \\u000a \\u000a Methods  We performed cerebral angiography at 24 h to determine the status of occlusion

Adnan I. Qureshi; Haitham M. Hussein; Mohamed Abdelmoula; Alexandros L. Georgiadis; Nazli Janjua

2009-01-01

48

What Are Varicose Veins?  

MedlinePLUS

... Gets Them? Varicose veins are more common in women, and people are more likely to get them as they get older. These veins can be genetic (say: juh-NEH-tik). That means that if your mom or your sister ... veins. Sometimes women who are pregnant get them, too. If someone ...

49

Deep vein thrombosis and pulmonary embolism in a patient affected by uterine fibroids: clinical case.  

PubMed

A 51 year old woman was admitted for night dyspneic attacks and fainting. When hospitalised the patient reported in the previous 10 days dry cough, edema and pain (left leg). The woman's medical history did not show any risk factors for vein thromboembolism, d-dimer dosage appeared increased and arterial blood gas showed hypoxemia and hypocapnia. ECG and chest X-Rays were within normal limits; a chest CT diagnosed pulmonary embolism that was treated with thrombolytic therapy. Venous lower extremity ultrasound detected ilio-femoral and popliteal venous thrombosis and an abdominal CT showed a swollen and fibromatous uterus, obstructing the left iliac vein system. Thrombolytic therapy was effective to for pulmonary embolism and to begin recanalization of the iliac, femoral, and popliteal veins. The patients was sent home in good clinical conditions, with anticoagulant therapy; later the uterine fibroma was treated with hysterectomy. PMID:23241942

Ippolito, E; Buora, A; Belcaro, G; Alari, G; Arpaia, G; Ciammaichella, G

2012-12-01

50

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

51

Effect of Early and Delayed Recanalization on Infarct Pattern in Proximal Middle Cerebral Artery Occlusion  

Microsoft Academic Search

Background: To investigate the effect of early (<6 h) versus delayed (>6 h) recanalization on infarct pattern in acute middle cerebral artery (MCA) occlusion. Methods: 35 patients with acute MCA occlusion (M1 segment; symptom onset <6 h) were analyzed. Stroke MRI was performed immediately after admission (day 0), and on days 1 and 7. In addition, vessel status was assessed

Marek Humpich; Oliver C. Singer; Richard du Mesnil de Rochemont; Christian Foerch; Heiner Lanfermann; Tobias Neumann-Haefelin

2006-01-01

52

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

SciTech Connect

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

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

1996-05-15

53

Major Neurologic Improvement following Endovascular Recanalization Therapy for Acute Ischemic Stroke  

Microsoft Academic Search

Background: We aimed to identify the rate of major neurologic improvement (MNI) at 24 h following endovascular recanalization therapy (ERT) for acute ischemic stroke and its association with short-term outcome. Methods: We retrospectively reviewed consecutive acute ischemic stroke patients presenting to our institution over 4 years and undergoing ERT. Angiograms were independently reviewed. Data on demographics, medical history, initial NIHSS

Shyam Prabhakaran; Michael Chen; Jae H. Choi; Sundeep Mangla; Sean D. Lavine; John Pile-Spellman; Philip M. Meyers; Ji Y Chong

2008-01-01

54

Spontaneous Recanalization after Complete Occlusion of the Common Carotid Artery with Subsequent Embolic Ischemic Stroke  

PubMed Central

Introduction: Acute carotid artery occlusion carries a high morbidity and mortality. Acute angioplasty and stenting is a feasible option with little known about the long term outcome. Limiting factor for this approach is hyperperfusion syndrome or hemorrhagic infarction. Spontaneous early or late recanalization for extracranial vessel is in the range of 5% –30%, with no well defined clinical outcome data. We describe a case of spontaneous common carotid recanalization. Case Report: An 88 year old man presented with right sided weakness, global aphasia and visual field loss and was discovered to have common carotid occlusion at its origin. Within 12 hours of symptom onset patient improved neurologically to his baseline exam and repeat imaging demonstrated spontaneous recanalization. This was followed symptomatic occlusion of left middle cerebral artery The patient was treated with multimodality approach resulting in complete revascularization of the middle cerebral artery and angioplasty and stent placement of the internal carotid artery. Patient had a good neurological outcome at 3 months followup. Conclusion: The present case report demonstrates the risk of spontaneous recanalization acutely in patients presenting with common carotid artery occlusion and associated risk of embolic strokes. In such a patient, concomitant treatment for intracranial occlusion and extracranial high grade stenosis may be performed safely after 30 hours from the initial symptom onset. PMID:22518244

Shah, Qaisar A.

2009-01-01

55

Less Invasive Ultrasonography-Guided High Ligation of Great Saphenous Vein in Endovenous Laser Ablation  

PubMed Central

Endovenous laser ablation (EVLA) has two pitfalls: endovenous heat-induced thrombosis (EHIT) and great saphenous vein (GSV) recanalization. To eliminate these complications, we developed ultrasonographyguided high ligation (UGHL) using a puncture-sized incision as an adjunct treatment to EVLA. UGHL combined with EVLA was used in 20 patients. The GSV was encircled with 2-0 silk thread at 2 cm distal to the saphenofemoral junction through two incisions of 2–3 mm by using a Deschamps aneurysm needle under ultrasonographic guidance. UGHL was technically feasible in all cases, and no case presented with complications. UGHL may be used in addition to EVLA. PMID:23825509

2013-01-01

56

Limitations of Percutaneous Techniques in the Treatment of Portal Vein Thrombosis  

SciTech Connect

New therapeutic alternatives to portal vein thrombosis (PVT) include the percutaneous, transhepatic infusion of fibrinolytic agents, balloon dilatation, and stenting. These maneuvers have proven to be effective in some cases with acute, recent PVT. We have treated two patients with acute PVT via transhepatic or transjugular approaches and by using pharmacologic and mechanical thrombolysis and thrombectomy. Although both patients clinically improved, morphologic results were only fair and partial rethrombosis was observed. The limitations of percutaneous procedures in the recanalization of acute PVT in noncirrhotic patients are discussed.

Bilbao, Jose I.; Vivas, Isabel; Elduayen, Beatriz; Alonso, Carlos; Gonzalez-Crespo, Inaki; Benito, Alberto; Martinez-Cuesta, Antonio [Department of Radiology, Clinica Universitaria de Navarra, Facultad de Medicina, Universidad de Navarra, Avenida Pio XII no. 36, E-31008 Pamplona (Spain)

1999-09-15

57

Vein of Galen Aneurysms  

PubMed Central

Summary Eleven patients with so-called “vein of Galen aneurysms ” are reported, six of whom presented with vein of Galen aneurysmal malformations (four with choroidal type and two with mural type malformations). The remaining five patients presented with vein of Galen aneurysmal dilatations secondarily due to an arteriovenous malformation in one patient, an arteriovenous fistula in another, dural arteriovenous fistulas in two patients, and a varix in another. Treatments for these patients were individualised with consideration given to the clinical manifestations and the angioarchitecture of their lesions. Endovascular intervention played a critical role in the treatment of these vein of Galen aneurysms. PMID:20663385

Komiyama, M.; Nakajima, H.; Nishikawa, M.; Yamanaka, K.; Iwai, Y.; Yasui, T.; Morikawa, T.; Kitano, S.; Sakamoto, H.; Nishio, A.

2001-01-01

58

Preventing Deep Vein Thrombosis  

MedlinePLUS

... birth control methods that contain estrogen or hormone therapy for menopause symptoms • Certain illnesses, including heart failure, inflammatory bowel disease, and some kidney disorders • Obesity • Smoking • Varicose veins • ...

59

Endovenous Laser Ablation of the Small Saphenous Vein Sparing the Saphenopopliteal Junction  

SciTech Connect

To assess outcomes after endovenous laser ablation (EVLA) of the small saphenous vein (SSV). Retrospective review was performed of all consecutive EVLA procedures performed over a 39-month period at three neighboring vein practices for symptomatic, duplex ultrasound-proven incompetence of the SSV. EVLA was performed under ultrasound guidance with an 810- or 980-nm diode laser in continuous mode using the pullback method while sparing the deep, most cephalad segment of the SSV near the saphenopopliteal junction. Follow-up after EVLA included patient symptoms, physical examination, and duplex ultrasound. Pretreatment variables were similar across all three practices. EVLA was performed to treat 67 incompetent SSVs in 63 patients (86% women; mean age and 95% confidence interval, 50 {+-} 3 years; range, 20-82 years). Average energy delivered was 92 J/cm. Immediate technical success and occlusion of the treated vein at 1-2 weeks was 100%. Imaging follow-up length was 243 {+-} 65 days (range, 3-893 days). Clinical follow-up (243 {+-} 66 days) showed symptomatic improvement in 66 (99%) of 67 patients; one patient had recanalization with recurrent reflux by ultrasound (2%). Complications included one case of paresthesias lasting beyond 1 month of follow-up (2%) and three cases of superficial phlebitis (4%), but no deep vein thrombosis, skin burns, or other complications. Although ablation involved only the superficial portion of the SSV and spared its deep segment in the popliteal fossa, SSV occlusion typically extended up to the saphenopopliteal junction or to a gastrocnemial collateral, without popliteal vein involvement. EVLA of the SSV is safe and effective when the saphenopopliteal junction and popliteal fossa are avoided. This approach may help reduce the risk of paresthesias or other complications while maintaining low recanalization rates.

Janne d'Othee, Bertrand, E-mail: bjannedothee@umm.edu; Walker, T. Gregory; Kalva, Sanjeeva P.; Ganguli, Suvranu; Davison, Brian [Massachusetts General Hospital-Harvard Medical School, Department of Imaging, Division of Vascular Imaging and Intervention (United States)

2010-08-15

60

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

61

Complete spontaneous thrombosis and recanalization of a ruptured posterior cerebral artery aneurysm.  

PubMed

Complete spontaneous thrombosis followed by recanalization of non-giant aneurysms is a rare event that can be discovered incidentally on advanced neural images. In this case report, the authors described a woman who presented with subarachnoid hemorrhage (SAH) and left posterior cerebral artery (PCA) territory ischemic stroke. Cerebral angiography revealed a left PCA aneurysm at the P1-P2 junction. The patient received conservative treatment and repeated cerebral angiography 4 weeks later demonstrated the disappeared aneurysm. Subsequent magnetic resonance imaging (MRI) and contrast-enhanced computed tomography (CT) demonstrated the totally thrombosed aneurysm with hydrocephalus. Ventriculo-peritoneal shunt surgery for hydrocephalus was performed and the patient noted a great improvement of the neurological deficit. Follow-up contrast-enhanced CT after 10 weeks revealed recurrence of the aneurysm. This case provides insight into the natural dynamic process of intracranial aneurysm, and a complete thrombosed aneurysm has the potential for recanalization. PMID:24848183

Wei, Du; Jingru, Zhou; Cungang, Fan; Yake, Xue; Dongliang, Wang; Zhengmao, Wei; Xinting, Wei; Qingjun, Zhang

2014-01-01

62

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

63

Do Bubble Characteristics Affect Recanalization in Stroke Patients Treated with Microbubble-Enhanced Sonothrombolysis?  

Microsoft Academic Search

Administration of microbubbles (MB) may augment the effect of ultrasound-enhanced systemic thrombolysis in acute stroke. Bubble structural characteristics may influence the effect of MB on sonothrombolysis. We aimed to compare the effects of galactose-based air-filled MB (Levovist) and sulphur hexafluoride-filled MB (Sonovue) on recanalization and clinical outcome. One hundred thirty-eight i.v. recombinant tissue plasminogen activator-(tPA-) treated patients with middle cerebral

Marta Rubiera; Marc Ribo; Raquel Delgado-Mederos; Estevo Santamarina; Olga Maisterra; Pilar Delgado; Joan Montaner; José Alvarez-Sabín; Carlos A. Molina

2008-01-01

64

Percutaneous recanalization of arteries: Status and prospects of laser angioplasty with modified fibre tips  

Microsoft Academic Search

Percutaneous balloon dilatation of arterial stenoses is a firmly established non-surgical treatment of ischaemic disease.\\u000a The number of percutaneous transluminal coronary angioplasties performed per year in the USA approaches the number of coronary\\u000a artery bypass graft operations. A great number of novel percutaneous recanalization schemes address the major problems of\\u000a balloon angioplasty: failure to cross the stenosis (occlusion), failure to

Cornelius Borst

1987-01-01

65

Recanalization therapy for acute ischemic stroke, part 1: surgical embolectomy and chemical thrombolysis  

Microsoft Academic Search

Cerebral revascularization approaches for acute ischemic stroke greatly expanded during the past decade. Many new revascularization\\u000a strategies are currently being assessed, while others continue to gain in popularity, offering hope to those with an otherwise\\u000a refractory disease. We discuss historical and current progress toward successful recanalization, as well as the efforts being\\u000a made to develop a safe and efficacious method

Saeed Ansari; Maryam Rahman; Michael F. Waters; Brian L. Hoh; J Mocco

2011-01-01

66

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

67

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

68

Spontaneous Recanalization of Superior Mesenteric Artery Occlusion Following Angioplasty and Stenting of Inferior Mesenteric Artery  

SciTech Connect

An 84-year-old woman with a history of hypertension and coronary artery disease was admitted with a progressively worsening diffuse abdominal pain. Computed tomography scan of the abdomen and angiography revealed occlusion of the origin and proximal portion of superior mesenteric artery. Aortography also showed severe origin stenosis of inferior mesenteric artery and that the distal part of the superior mesenteric artery was supplied by a prominent marginal artery of Drummond. Patient was effectively treated with percutaneous transluminal angioplasty and stenting of the inferior mesenteric artery. Follow-up imaging studies demonstrated patency of the stent and spontaneous recanalization of superior mesenteric artery occlusion.

Akpinar, Erhan, E-mail: eakp0@Lycos.com; Cil, Barbaros E.; Arat, Anil [Hacettepe University, Departments of Radiology (Turkey); Baykal, Atac; Karaman, Kerem [Hacettepe University, Departments of General Surgery (Turkey); Balkanci, Ferhun [Hacettepe University, Departments of Radiology (Turkey)

2006-02-15

69

The Outback Catheter: A New Device for True Lumen Re-entry After Dissection During Recanalization of Arterial Occlusions  

SciTech Connect

To report the initial experience with a new catheter system (The Outback catheter) designed to allow fluoroscopically controlled re-entry of the true arterial lumen after subintimal guidewire passage during recanalization procedures of arterial occlusions. The catheter was used in 10 patients with intermittent claudication caused by chronic segmental occlusions of the superficial femoral or popliteal arteries. In all patients, conventional guidewire recanalization had failed. In 8 patients, successful true lumen re-entry was achieved with the Outback catheter. Percutaneous transluminal angioplasty was successfully performed in these patients without complications. Two technical failures occurred in heavily calcified arteries. The Outback catheter was safe and effective when used in complicated recanalization procedures in the superficial femoral and popliteal artery and the tibial trunk.

Hausegger, Klaus A., E-mail: klaus.hausegger@lkh-klu.at; Georgieva, Borjana; Portugaller, Horst; Tauss, Josef [University Hospital Graz, Auenbruggerplatz 9, 8036 Graz, Department of Radiology (Austria); Stark, Gerhard [University Hospital Graz, Graz, Department of Internal Medicine, Angiology (Austria)

2004-01-15

70

Multimodal CT Imaging and Recanalizing Therapy in Acute Ischemic Stroke: Retrospective Analysis of a One-Year Single-Center Experience  

Microsoft Academic Search

Background: Recanalizing therapy in ischemic stroke is restricted to thrombolysis within 3 h. Multimodal imaging of vessel and parenchymal perfusion status may allow the extension of this time window. Aim: To retrospectively analyze treatment results of any recanalizing therapy in clinical practice. Methods: Patients comprised three groups: ‘standard’ intravenous thrombolysis within 3 h; ‘off-label’ intravenous thrombolysis, and off-label interventional therapy.

Jens Eyding; Reinhard Wiebringhaus; Frauke G. Klein; Sabine Skodda; Uwe Schlegel; Andriy Alekseyev; Lothar Heuser

2012-01-01

71

Intravascular ultrasound-guided recanalization of a coronary chronic total occlusion located in a stent implanted subintimally: a case report.  

PubMed

Successful percutaneous recanalization of coronary chronic total occlusion (CTO) results in improved survival, as well as enhanced left ventricular function, reduction of angina, and improved exercise tolerance. The procedural success rate has increased over time, but CTO recanalization does still fail in about 20% of cases. Different strategies and specific devices for CTOs have been developed with various degrees of success. We report the case of CTO after a first unsuccessful treatment attempt during which subintimal wire positioning without reentry into the distal lumen, and stent implantation were done. At the second revascularization, intravascular ultrasound guidance allowed reentry of the distal true lumen through the stent, restoring normal flow. PMID:16948452

Surmely, Jean-Francois; Suzuki, Takahiko

2006-08-01

72

[Sclerosis in varicose veins].  

PubMed

The authors report their experience in the sclerotherapy of varicose veins. They have used the technique of French school: with the patient half sitting, direct puncture not far from the gulf of saphena without tourniquet, on a weekly basis. PMID:9835187

Perilli, G; Scioscia, P; Ferretti, L

1998-10-01

73

Thrombolysis in anterior versus posterior circulation strokes: timing of recanalization, ischemic tolerance, and other differences.  

PubMed

Previous studies have suggested a greater ischemic tolerance in posterior circulation as compared to anterior cerebral circulation. We aimed to investigate whether a differential response exists between anterior and posterior circulation strokes. Two hundred and four middle cerebral artery (MCA) patients and 28 basilar artery occlusion (BAO) patients treated with intravenous recombinant tissue plasminogen activator were included. Transcranial Doppler assessed recanalization at different time points. Patients were divided in three groups: total time of ischemia (TTI)<6, 6-24, or>24 hours. We calculated the percentage of recovery (admission National Institutes of Health Stroke Scale [NIHSS]- discharge NIHSS/admission NIHSS)×100. Mean time to treatment was longer in BAO patients (P=.031). Early recanalization was more frequent among MCA occlusions (41% vs 29%; P=.039); the rate of persisting occlusion at 24 hours was similar (P=.933). Clinical recovery according to TTI was similar in each group: <6 hours: BAO 84%/MCA 69%; 6-24 hours: BAO 63%/MCA 61%; >24 hours: BAO -44%/MCA 11% (P=.23). For each hour of ischemia MCA patients worsened 1.78% (P=.035) and BAO 1.76% (P=.421). MCA occlusions compared to BAO were independently associated with hemorrhagic transformation (OR: 8.2; P=.043). Our data do not support the theory of increased ischemic tolerance in posterior circulation. Despite longer time-to-treatment, BAO were more resistant to hemorrhagic transformations. PMID:20040010

Pagola, Jorge; Ribo, Marc; Alvarez-Sabin, José; Rubiera, Marta; Santamarina, Estevo; Maisterra, Olga; Delgado-Mederos, Raquel; Ortega, Gemma; Quintana, Manuel; Molina, Carlos A

2011-04-01

74

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

75

Sublingual vein injection in rodents  

Microsoft Academic Search

SUMMARY A simple and rapid technique for intravenous IllJection into the sub- lingual veins of common laboratory rodents is described. No prior pre- paration other than light anaesthesia is required and repeated injections can be made into the same vein. 35 The major problem associated with intravenous administration in common laboratory rodents is the inaccessibility of the veins. In most

H. B. Waynforth; R. Parkin

1969-01-01

76

Extrahepatic portal vein aneurysm.  

PubMed

Portal vein aneurysms (PVAs) are usually incidental on imaging and asymptomatic. If it is symptomatic or associated with a pathologic finding, a treatment is recommended. We report a case of a 75-year-old Caucasian man presenting with symptomatic and size-increasing portosplenomesenteric aneurysms. Interventional radiology was not indicated because of the large size. A surgical approach was chosen for the patient. Surgical technique consists of an aneurysmorrhaphy in the first time and in the second time, a Goretex prosthesis placement involving the vein. Early complication was treated with a radiologic approach. Six months after surgery, patient had no more symptoms. PVA management remains a surgical challenge for surgeon, for timing and type of treatment. PMID:24456867

Levi Sandri, Giovanni Battista; Sulpice, Laurent; Rayar, Michel; Bosquet, Elise; Boudjema, Karim; Meunier, Bernard

2014-07-01

77

Portal vein thrombosis  

Microsoft Academic Search

Opinion statement  Portal vein thrombosis (PVT) can be a difficult clinical problem to assess and manage. A high index of suspicion is needed\\u000a for a PVT diagnosis given the subtle presentation and potentially serious long-term complications. It should be considered\\u000a a clue to the presence of one or several underlying disorders, including prothrombotic disorders, whether or not a local precipitating\\u000a factor

Hector Rodriguez-Luna; Hugo E. Vargas

2007-01-01

78

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.

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

2014-01-01

79

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

2014-07-01

80

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

81

Successful pregnancy by direct intraperitoneal insemination in an infertile patient with failure of recanalization of isthmic stenosis after laparoscopic radical trachelectomy  

PubMed Central

Radical trachelectomy is a promising fertility-sparing treatment for patients with early stage cervical cancer who want to preserve their fertility. However, isthmic stenosis occurs frequently in patients who received radical trachelectomy and it is one of the causes of infertility following radical trachelectomy. Moreover, despite the treatment for recanalization of isthmic stenosis, recanalization can fail or isthmic stenosis can recur. Herein we report a successful pregnancy and birth by direct intraperitoneal insemination in an infertile woman with failure of recanalization of isthmic stenosis after laparoscopic radical trachelectomy. PMID:24596824

Choi, Sun-Young; Lee, Kyung-Hee; Suk, Hye-Jin; Chae, Hee-Dong; Kang, Byung-Moon

2014-01-01

82

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

83

[Lower limb vein thrombosis in dynamics of acute impairments of cerebral circulation].  

PubMed

The present work was aimed at studying the state of the inferior vena cava system according to the findings of duplex scanning in dynamics of acute cerebral circulation impairments (ACCI). Amongst 100 patients with ACCI, lower limb vein deep thrombosis (LLVDT) was revealed in 57% of cases. The incidence of LLVDT in patients with intracerebral haemorrhage was higher than in those with ischaemic stroke, however there were no statistically significant differences between the type of ACCI (p=0.06) and subtypes of ischaemic stroke (atherothrombotic, ceardioembolic) (p = 0.68). The main risk factors for LLVDT are the presence of pronounced motion deficit in the extremities, induced by the underlying disease (p=0.02) and immobilization. In the overwhelming majority of patients (81%) thrombosis localized isolatedly in the crural veins. Ascending thrombosis and the development of a floating thrombus were represented mainly on the side of motility deficit in the extremities. We have confirmed a strong association between positive dynamics in the neurological status of patients and frequency of recanalization of thrombi (p=0.043). Ultrasonographic examination of lower limb veins in dynamics of ACCI is an important component of preventive and therapeutic process. PMID:22929675

Kuntsevich, G I; Maksimova, M Iu; Popova, L A; Riabinkina, Iu V; Gnedovskaia, E V; Piradov, M A

2012-01-01

84

Reperfusion Is a More Accurate Predictor of Follow-Up Infarct Volume than Recanalization: A Proof of Concept using CT in Acute Ischemic Stroke Patients  

PubMed Central

PURPOSE To compare recanalization and reperfusion in terms of their predictive value for imaging outcomes (follow-up infarct volume, infarct growth, salvaged penumbra) and clinical outcome in acute ischemic stroke patients. MATERIAL AND METHODS Twenty-two patients admitted within 6 hours of stroke onset were retrospectively included in this study. These patients underwent a first stroke CT protocol including CT-angiography (CTA) and perfusion-CT (PCT) upon admission, and similar imaging after treatment, typically around 24 hours, to assess recanalization and reperfusion. Recanalization was assessed by comparing arterial patency on admission and post-treatment CTAs; reperfusion, by comparing the volumes of CBV, CBF and MTT abnormality on admission and post-treatment PCTs. Collateral flow was graded on the admission CTA. Follow-up infarct volume was measured on the discharge noncontrast CT. The groups of patients with reperfusion, no reperfusion, recanalization, and no recanalization were compared in terms of imaging and clinical outcomes. RESULTS Reperfusion (using an MTT reperfusion index > 75%) was a more accurate predictor of follow-up infarct volume than recanalization. Collateral flow and recanalization were not accurate predictors of follow-up infarct volume. An interaction term was found between reperfusion and the volume of the admission penumbra > 50 mL. CONCLUSION Our study provides evidence that reperfusion is a more accurate predictor of follow-up infarct volume in acute ischemic stroke patients than recanalization. We recommend an MTT reperfusion index > 75% to assess therapy efficacy in future acute ischemic stroke trials that use perfusion-CT. PMID:19910542

Soares, Bruno P.; Tong, Elizabeth; Hom, Jason; Su-Chun, Cheng; Bredno, Joerg; Boussel, Loic; Smith, Wade S.; Wintermark, Max

2009-01-01

85

JAMA Patient Page: Treatment of Varicose Veins  

MedlinePLUS

... removal of varicose veins just below the skin’s surface. • Sclerotherapy —a solution is injected into the vein causing it to scar down and visibly fade. This therapy is recommended for telangiectasias, reticular veins, or small ...

86

Fluoroscopically Guided Transcervical Fallopian Tube Recanalization of Post-Sterilization Reversal Mid-Tubal Obstructions  

SciTech Connect

Purpose: To assess the technical success and early outcome of fluoroscopically guided transcervical fallopian tube recanalization (FTR) in mid-tubal occlusion following sterilization reversal surgery.Methods: From July 1995 to January 1998, patients with greater than 12 months secondary infertility underwent hysterosalpingography (HSG). FTR was performed in proximal or mid-tubal occlusion. Cases of FTR in mid-tubal occlusion were included in this study. Technical success (defined as complete tubal patency) using a standard guidewire and hydrophilic glidewire, the number of patients with at least one patent tube, and the intrauterine and ectopic pregnancy rates were determined.Results: Twenty-six infertile patients with previous sterilization reversal underwent HSG. Eight of 26 (31%) patients (mean age 32 years, range 23-37 years), had attempted FTR for mid-tubal occlusion at the site of surgical anastomosis. Fourteen tubes were attempted as there were two previous salpingectomies. Technical success was achieved in eight of 14 (57%) tubes attempted, resulting in five of eight (62%) patients having at least one patent tube. At follow-up (mean 18 months, range 12-28 months) in these five patients there was one intrauterine pregnancy. There were no ectopic pregnancies.Conclusions: FTR in mid-tubal obstruction in infertile patients following sterilization reversal surgery is technically feasible and may result in intrauterine pregnancy. In this small group there was a lower technical success rate and lower pregnancy rate than in unselected proximal tubal occlusion.

Houston, J. Graeme [Department of Radiology, Ninewells Hospital and Medical School, Tayside University Hospitals NHS Trust, Dundee DD1 9SY, Scotland (United Kingdom); Anderson, David; Mills, John; Harrold, Anthony [Assisted Conception Unit, Ninewells Hospital and Medical School, Tayside University Hospitals NHS Trust, Dundee DD1 9SY, Scotland (United Kingdom)

2000-03-15

87

Mechanical Recanalization of Subacute Vessel Occlusion in Peripheral Arterial Disease with a Directional Atherectomy Catheter  

SciTech Connect

Purpose: To retrospectively examine the technical feasibility and safety of directional atherectomy for treatment of subacute infrainguinal arterial vessel occlusions. Methods: Five patients (one woman, four men, age range 51-81 years) with peripheral arterial disease who experienced sudden worsening of their peripheral arterial disease-related symptoms during the last 2-6 weeks underwent digital subtraction angiography, which revealed vessel occlusion in native popliteal artery (n = 4) and in-stent occlusion of the superficial femoral artery (n = 1). Subsequently, all patients were treated by atherectomy with the SilverHawk (ev3 Endovascular, USA) device. Results: The mean diameter of treated vessels was 5.1 {+-} 1.0 mm. The length of the occlusion ranged 2-14 cm. The primary technical success rate was 100%. One patient experienced a reocclusion during hospitalization due to heparin-induced thrombocytopenia. There were no further periprocedural complications, in particular no peripheral embolizations, until hospital discharge or during the follow-up period of 1 year. Conclusion: The recanalization of infrainguinal arterial vessel occlusions by atherectomy with the SilverHawk device is technically feasible and safe. In our limited retrospective study, it was associated with a high technical success rate and a low procedure-related complication rate.

Massmann, Alexander, E-mail: Alexander.Massmann@uks.eu; Katoh, Marcus [Saarland University Hospital, Department of Diagnostic and Interventional Radiology (Germany); Shayesteh-Kheslat, Roushanak [Saarland University Hospital, Department of General Surgery, Visceral, Vascular, and Pediatric Surgery (Germany); Buecker, Arno [Saarland University Hospital, Department of Diagnostic and Interventional Radiology (Germany)

2012-10-15

88

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

89

Varicose Veins and Venous Insufficiency  

MedlinePLUS

... flowing toward the heart—against the force of gravity. When the valves do not perform their function, ... the vein, an interventional radiologist inserts a thin tube known as a catheter, about the size of ...

90

Inflammation in Retinal Vein Occlusion  

PubMed Central

Retinal vein occlusion is a common, vision-threatening vascular disorder. The role of inflammation in the pathogenesis and clinical consequences of retinal vein occlusion is a topic of growing interest. It has long been recognized that systemic inflammatory disorders, such as autoimmune disease, are a significant risk factor for this condition. A number of more recent laboratory and clinical studies have begun to elucidate the role inflammation may play in the molecular pathways responsible for the vision-impairing consequences of retinal vein occlusion, such as macular edema. This improved understanding of the role of inflammation in retinal vein occlusion has allowed the development of new treatments for the disorder, with additional therapeutic targets and strategies to be identified as our understanding of the topic increases. PMID:23653882

Deobhakta, Avnish; Chang, Louis K.

2013-01-01

91

Benefits of Endoscopic Vein Harvesting  

Microsoft Academic Search

.   The purpose of this study was to evaluate and compare the benefits of endoscopic saphenous vein harvesting (EVH) with the\\u000a traditional incision technique (TIT) for coronary artery bypass grafting (CABG) in respect to the technical procedure and\\u000a clinical outcome. In a prospective nonrandomized, case-matched study the greater saphenous vein was harvested for CABG in\\u000a 22 patients using the endoscopic

Bettina Marty; Ludwig Karl von Segesser; Piergiorgio Tozzi; Juan Guzmann; Philippe Frascarolo; Xavier Muller; Daniel Hayoz

2000-01-01

92

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

93

Recanalization and Clinical Outcome of Occlusion Sites at Baseline CT Angiography in the Interventional Management of Stroke III Trial.  

PubMed

Purpose To use baseline computed tomographic (CT) angiography to analyze imaging and clinical end points in an Interventional Management of Stroke III cohort to identify patients who would benefit from endovascular stroke therapy. Materials and Methods The primary clinical end point was 90-day dichotomized modified Rankin Scale (mRS) score. Secondary end points were 90-day mRS score distribution and 24-hour recanalization. Prespecified subgroup was baseline proximal occlusions (internal carotid, M1, or basilar arteries). Exploratory analyses were subsets with any occlusion and specific sites of occlusion (two-sided ? = .01). Results Of 656 subjects, 306 (47%) underwent baseline CT angiography or magnetic resonance angiography. Of 306, 282 (92%) had arterial occlusions. At baseline CT angiography, proximal occlusions (n = 220) demonstrated no difference in primary outcome (41.3% [62 of 150] endovascular vs 38% [27 of 70] intravenous [IV] tissue-plasminogen activator [tPA]; relative risk, 1.07 [99% confidence interval: 0.67, 1.70]; P = .70); however, 24-hour recanalization rate was higher for endovascular treatment (n = 167; 84.3% [97 of 115] endovascular vs 56% [29 of 52] IV tPA; P < .001). Exploratory subgroup analysis for any occlusion at baseline CT angiography did not demonstrate significant differences between endovascular and IV tPA arms for primary outcome (44.7% [85 of 190] vs 38% [35 of 92], P = .29), although ordinal shift analysis of full mRS distribution demonstrated a trend toward more favorable outcome (P = .011). Carotid T- or L-type occlusion (terminal internal carotid artery [ICA] with M1 middle cerebral artery and/or A1 anterior cerebral artery involvement) or tandem (extracranial or intracranial) ICA and M1 occlusion subgroup also showed a trend favoring endovascular treatment over IV tPA alone for primary outcome (26% [12 of 46] vs 4% [one of 23], P = .047). Conclusion Significant differences were identified between treatment arms for 24-hour recanalization in proximal occlusions; carotid T- or L-type and tandem ICA and M1 occlusions showed greater recanalization and a trend toward better outcome with endovascular treatment. Vascular imaging should be mandated in future endovascular trials to identify such occlusions. © RSNA, 2014 Online supplemental material is available for this article. PMID:24895878

Demchuk, Andrew M; Goyal, Mayank; Yeatts, Sharon D; Carrozzella, Janice; Foster, Lydia D; Qazi, Emmad; Hill, Michael D; Jovin, Tudor G; Ribo, Marc; Yan, Bernard; Zaidat, Osama O; Frei, Donald; von Kummer, Rüdiger; Cockroft, Kevin M; Khatri, Pooja; Liebeskind, David S; Tomsick, Thomas A; Palesch, Yuko Y; Broderick, Joseph P

2014-10-01

94

Endovascular recanalization of infrapopliteal occlusions in patients with critical limb ischemia  

PubMed Central

Background Endovascular therapies are increasingly used for treatment of critical limb ischemia (CLI). Infrapopliteal (IP) occlusions are common in CLI, and successful limb salvage may require restoration of arterial flow in the distribution of a chronically occluded vessel. We sought to describe the procedural characteristics and outcomes of patients with IP occlusions who underwent endovascular intervention for treatment of CLI. Methods All patients with IP interventions for treatment of CLI from 2006 to 2012 were included. Angiographic and procedural data were compared between patients who underwent intervention for IP occlusions vs IP stenosis. Restenosis was determined by Doppler ultrasound imaging. Limb salvage was the primary end point of the study. Additional end points included primary patency, primary assisted patency, secondary patency, occlusion crossing success, procedural success, and amputation-free survival. Results A total of 187 patients with CLI underwent interventions for 356 IP lesions, and 77 patients (41%) had interventions for an IP occlusion. Patients with an intervention for IP occlusion were more likely to have zero to one vessel runoff (83% vs 56%; P < .001) compared with interventions for stenosis. Compared with IP stenoses, IP occlusions were longer (118 ± 86 vs 73 ± 67 mm; P < .001) and had a smaller vessel diameter (2.5 ± 0.8 vs 2.7 ± 0.5 mm; P =.02). Wire crossing was achieved in 83% of IP occlusions, and the overall procedural success for IP occlusions was 79%. The overall 1-year limb salvage rate was 84%. Limb salvage was highest in the stenosis group, slightly lower in the successful occlusion group, and lowest in the failed occlusion group (92% vs 75% vs 58%, respectively; P = .02). Unsuccessfully treated IP occlusions were associated with a significantly higher likelihood of major amputation (hazard ratio, 5.79; 95% confidence interval, 1.89–17.7) and major amputation or death (hazard ratio, 2.69; 95% confidence interval, 1.09–6.63). Conclusions Successful endovascular recanalization of IP occlusions can be achieved with guidewire and support catheter techniques in most patients. In patients selected for an endovascular-first approach for IP occlusions in CLI, this strategy can be successfully implemented with favorable rates of limb salvage. PMID:24393279

Singh, Gagan D.; Armstrong, Ehrin J.; Yeo, Khung-Keong; Singh, Satinder; Westin, Gregory G.; Pevec, William C.; Dawson, David L.; Laird, John R.

2014-01-01

95

Pharmacological and Non-Pharmacological Recanalization Strategies in Acute Ischemic Stroke  

PubMed Central

According to the guidelines of the European Stroke Organization (ESO) and the American Stroke Association (ASA), acute stroke patients should be managed at stroke units that include well organized pre- and in-hospital care. In ischemic stroke the restoration of blood flow has to occur within a limited time window that is accomplished by fibrinolytic therapy. Newer generation thrombolytic agents (alteplase, pro-urokinase, reteplase, tenecteplase, desmoteplase) have shorter half-life and are more fibrin-specific. Only alteplase has Food and Drug Administration (FDA) approval for the treatment of acute stroke (1996). The National Institute of Neurological Disorders and Stroke (NINDS) trial proved that alteplase was effective in all subtypes of ischemic strokes within the first 3?h. In the European cooperative acute stroke study III trial, intravenous (IV) alteplase therapy was found to be safe and effective (with some restrictions) if applied within the first 3–4.5?h. In middle cerebral artery (MCA) occlusion additional transcranial Doppler insonication may improve the breakdown of the blood clot. According to the ESO and ASA guidelines, intra-arterial (IA) thrombolysis is an option for recanalization within 6?h of MCA occlusion. Further trials on the IA therapy are needed, as previous studies have involved relatively small number of patients (compared to IV trials) and the optimal IA dose of alteplase has not been determined (20–30?mg is used most commonly in 2?h). Patients undergoing combined (IV?+?IA) thrombolysis had significantly better outcome than the placebo group or the IV therapy alone in the NINDS trial (Interventional Management of Stroke trials). If thrombolysis fails or it is contraindicated, mechanical devices [e.g., mechanical embolus removal in cerebral ischemia (MERCI)- approved in 2004] might be used to remove the occluding clot. Stenting can also be an option in case of acute internal carotid artery occlusion in the future. An intra-aortic balloon was used to increase the collateral blood flow in the Safety and Efficacy of NeuroFlo™ Technology in Ischemic Stroke trial (results are under evaluation). Currently, there is no approved effective neuroprotective drug. PMID:21660098

Frendl, Anita; Csiba, László

2011-01-01

96

Surgical Access to Jejunal Veins for Local Thrombolysis and Stent Placement in Portal Vein Thrombosis  

SciTech Connect

Portal vein thrombosis is an infrequent entity, which may cause high morbidity and mortality. We report a case of portal vein thrombosis due to benign stenosis following partial pancreatoduodenectomy with segmental replacement of the portal vein by a Gore-tex graft. Using a surgical access to jenunal veins, local thrombolysis, mechanical fragmentation of thrombus, and stent placement were successfully performed.

Schellhammer, Frank, E-mail: frank.schellhammer@med.uni-duesseldorf.d [University Hospital Duesseldorf, Institute of Diagnostic Radiology (Germany); Esch, Jan Schulte am [University Hospital Duesseldorf, Department of General, Visceral and Pediatric Surgery (Germany); Hammerschlag, Sascha [University Hospital Duesseldorf, Institute of Diagnostic Radiology (Germany); Knoefel, Wolfram Trudo [University Hospital Duesseldorf, Department of General, Visceral and Pediatric Surgery (Germany); Fuerst, Guenter [University Hospital Duesseldorf, Institute of Diagnostic Radiology (Germany)

2008-07-15

97

TAIL VEIN INJECTION (SOP-7) INTRODUCTION  

E-print Network

TAIL VEIN INJECTION (SOP-7) INTRODUCTION Several techniques can be employed which allow within the vein. If the injection is placed subcutaneously, the tail may also blanch but the resistance, the tail can be warmed under a heat lamp. Warming the tail causes the veins to dilate. 3. Locate the right

Kleinfeld, David

98

Hemodilution therapy in central retinal vein occlusion  

Microsoft Academic Search

Systemic hemorheologic abnormalities may play a part in the pathogenesis of central retinal vein occlusions. A statistically significant elevation of plasma viscosity was found in patients with acute central retinal vein occlusion compared with control patients. Local retinal blood flow parameters including arteriovenous passage time and mean arterial dye bolus velocity were significantly altered in the central retinal vein occlusion

Sebastian Wolf; Oliver Arend; Bernd Bertram; Andreas Remky; Karin Schulte; Kenneth J. Wald; Martin Reim

1994-01-01

99

Does Current Oral Antiplatelet Agent or Subtherapeutic Anticoagulation Use Have an Effect on Tissue-Plasminogen-Activator-Mediated Recanalization Rate in Patients with Acute Ischemic Stroke?  

Microsoft Academic Search

Objective: Our goal is to assess if current antiplatelet (AP) use has an effect on recanalization rate and outcome in acute stroke patients. Methods: We conducted a retrospective analysis of acute stroke patients who received intravenous (IV) recombinant tissue plasminogen activator (rt-PA) and had transcranial Doppler examination within 3 h of symptom onset. The TCD findings were interpreted using the

Mohamed M. Ibrahim; Joseph Sebastian; Muhammad Hussain; Fawaz Al-Hussain; Ken Uchino; Carlos Molina; Khurshid Khan; Andrew M. Demchuk; Andrei V. Alexandrov; Maher Saqqur

2010-01-01

100

Posterolateral cervical vein as a recipient vein in reconstructive microvascular surgery of the head and neck.  

PubMed

Free flaps are becoming the preferred method of choice for head and neck reconstruction. However, many patients who have undergone radiotherapy and radical neck dissection or who require treatment for recurrent tumor, often present difficulty in choosing recipient vessels. The authors have noted a potential recipient vein coursing vertically along the anterior ridge of the trapezius muscle. They used this vein as the recipient vein in two patients; the two free flaps were transferred successfully without complications. This vein, which they provisionally named the posterolateral cervical vein (PLCV), is considered an important option as a recipient vein in head and neck reconstruction when more commonly used recipient cervical veins are unavailable. PMID:17230316

Yagi, Shunjiro; Nakayama, Bin; Kamei, Yuzuru; Takahashi, Masakathu; Torii, Shuhei

2007-01-01

101

The superficial femoral vein: a valuable conduit for a short renal vein in kidney transplantation.  

PubMed

A variety of techniques have been developed to improve the problem with a short renal vein in kidney transplantation. Those techniques range from thorough mobilization of the recipient common and external iliac veins (iliac vein transposition) to donor vein elongation with a saphenous or gonadal vein or a polytetrafluoroethylene graft. Right renal vein extension using the inferior vena cava represents an excellent option for cadaveric kidney transplantation; however, for kidneys from living donors, that is not a suitable alternative. We present two cases where the superficial femoral vein was used as a conduit with good results; there was no additional morbidity for the patient. Although uncommon, renal vein extensions are sometimes needed in kidney transplantation. The superficial femoral vein comes close to representing the ideal conduit for a short renal vein when compared with a synthetic or an autologous graft due to its diameter and harvesting technique. PMID:19545768

Alcocer, F; Zazueta, E; Montes de Oca, J

2009-06-01

102

Immunohistochemistry comparing endoscopic vein harvesting vs. open vein harvesting on saphenous vein endothelium  

PubMed Central

Objective The present study attempts to compare the immunohistochemistry (IHC) of von Willebrand factor (vWf) , endothelial cadherin, Caveolin and endothelial Nitric Oxide Synthase (eNOS) in VasoView Endoscopic Vein Harvesting (EVH) versus traditional Open Vein Harvesting (OVH) techniques for Coronary Artery Bypass Graft (CABG) Surgery performed in Javad al Aemeh Hospital of Mashhad, Iran in 2013,. Methods and materials Forty-seven patients were scheduled for CABG (30 EVH and 17 OVH) among whom patients with relatively same gender and similar age were selected. Three separate two cm vein samples were harvested from each patient’s saphenous vein. Each portion was collected from distal, middle and proximal zones of the saphenous vein. The tissues were deparaffinized, and antigen retrieval was done using EZ-retriever followed by an immunohistochemistry evaluation with vWf, e-cadherin, Caveolin and eNOS. In addition, demographic questioner as of Lipid profile, FBS, BMI, and cardiovascular risk factors were collected. Data analyses, including parametric and nonparametric tests were undertaken using the SPSS 16 software. A P value??0.05). Qualitative report of vWf, e-cadherin, Caveolin and eNOS reveals no significant difference between the EVH and OVH (P?>?0.05). Conclusion This study indicates that VasoView EVH technique causes no endothelial damage in comparison with OVH. This study could be a molecular confirmation for the innocuous of EVH technique. PMID:24938544

2014-01-01

103

Surgical Recanalization of Distal Middle Cerebral Artery Occlusion Due to a Coil Migration During Endovascular Coil Embolization: A Case Report  

PubMed Central

Coil migration into the parent artery during endovascular coil embolization is a rare, but life-threatening complication, which can induce thromboembolism and result in poor outcome. A 63-year-old man was referred to Chonbuk National University Hospital emergency center due to migration of a coil for a left middle cerebral artery bifurcation unruptured aneurysm. We performed an emergency craniectomy to remove the coil migrated to the distal M2 branch and thrombus, and aneurysmal neck clipping for his aneurysm. Fortunately, at the six month follow-up, the patient did not show any noticeable neurological sequela. In case of parent artery occlusion due to coil migration an immediate recanalization should be performed by a neurovascular specialist who can provide both surgical treatment and endovascular management in order to prevent severe sequela or even death. PMID:25340033

Lee, Jong-Myong; Koh, Eun-Jeong; Choi, Ha-Young

2014-01-01

104

Familial central retinal vein occlusion  

Microsoft Academic Search

AimTo report four cases of central retinal vein occlusion (CRVO) in a French family.Patients and methodsOphthalmological examination and medical work-up of seven members of the family.ResultsThere were four cases of CRVO in two consecutive generations. Three of them had CRVO in both eyes. Arterial hypertension was present in two, associated to glaucoma in one. Medical work-up did not reveal additional

J-F Girmens; S Scheer; E Héron; J-A Sahel; E Tournier-Lasserve; M Paques

2008-01-01

105

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

PubMed

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

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

2011-06-01

106

Recanalization of Acute and Subacute Femoropopliteal Artery Occlusions with the Rotarex Catheter: One Year Follow-up, Single Center Experience  

SciTech Connect

Purpose:To assess the efficacy and safety of a new rotational catheter for percutaneous removal of fresh and organized thrombi in the femoropopliteal artery.Methods:Forty-one limbs in 38 patients (age 56-90 years, mean 75.6 years) with acute, subacute or chronic femoropopliteal occlusions of 1-180 days' duration (mean 31.6 days) were treated with the Rotarex device. The Fontaine stage was mainly IIB (Rutherford 2-3, 22 patients) or III (Rutherford 4, 14 patients). The length of occlusion varied from 2 to 35 cm (mean 13.1 cm). After recanalization percutaneous transluminal angioplasty (PTA) was performed if there was a residual stenosis of >25%. Patients were followed up with color Doppler ultrasound at 48 hr and clinically with Doppler pressures and oscillometry at 3, 6, and 12 months.Results:After an average of two passages with the Rotarex catheter all but two limbs required PTA for residual stenosis >25%. Five patients needed additional stenting. Major complications were one groin hematoma requiring blood transfusion and one arteriovenous fistula spontaneously thrombosing after unsuccessful primary prolonged balloon dilation. Distal embolizations occurred in 10 patients; 6 clinically relevant emboli were aspirated. All occlusions were technically successfully recanalised there were 2 early reocclusions after 1 day and two at 2 weeks. Brachial-ankle indices improved from an average of 0.41 before to 0.93 after recanalization. Primary and secondary patency rates were 62% / 84% after 6 months and 39% / 68% after 1 year. The amputation-free survival at 12 months was 100%.Conclusion:The Rotarex mechanical thrombectomy device is an efficient, quick, easy to handle, and safe tool for the treatment of acute, subacute or even chronic peripheral arterial thromboembolic occlusions. It can be used for short or long occlusions with equal success, provided the obstruction is not heavily calcified and has been safely passed with a guidewire first.

Duc, Sylvain R., E-mail: Sylvain.duc@balgrist.ch; Schoch, Eric [Kantonsspital Winterthur, Department of Radiology (Switzerland); Pfyffer, Markus; Jenelten, Regula [Section of Angiology, Kantonsspital Winterthur, Department of Internal Medicine (Switzerland); Zollikofer, Christoph L. [Kantonsspital Winterthur, Department of Radiology (Switzerland)

2005-06-15

107

Central vein stenosis: a nephrologist's perspective.  

PubMed

Central vein stenosis is commonly associated with placement of central venous catheters and devices. Central vein stenosis can jeopardize the future of arteriovenous fistula and arteriovenous graft in the ipsilateral extremity. Occurrence of central vein stenosis in association with indwelling intravascular devices including short-term, small-diameter catheters such as peripherally inserted central catheters, long-term hemodialysis catheters, as well as pacemaker wires, has been recognized for over two decades. Placement of multiple catheters, longer duration, location in subclavian vein, and placement on the left-hand side of neck seem to predispose to the development of central vein stenosis. Endothelial injury with subsequent changes in the vessel wall results in development of microthrombi, smooth muscle proliferation, and central vein stenosis. Central vein stenosis is often asymptomatic in nondialysis patients, but can result in edema of ipsilateral extremity and breast when challenged by increased flow from an arteriovenous fistula or arteriovenous graft. Bilateral central vein stenosis or superior vena cava stenosis can produce a clinical picture of superior vena cava syndrome, associated with engorgement of face and neck. Endovascular interventions are the mainstay of management of central vein stenosis. Percutaneous angioplasty and stent placement for elastic and recurring lesions can restore the functionality of the vascular access, at least temporarily. Frequent or multiple interventions are usually required. In recalcitrant cases, surgical bypass of the obstruction is an option. In resistant cases with severe symptoms, occlusion of the functioning vascular access will usually provide relief of symptoms. Further study of mechanisms of development of central vein stenosis and search for a targeted therapy is likely to lead to better ways of managing central vein stenosis. Prevention of central vein stenosis is the key to avoid access failure and other complications from central vein stenosis and relies upon avoidance of central vein stenosis placement and timely placement of arteriovenous fistula in prospective dialysis patient. PMID:17244123

Agarwal, Anil K; Patel, Bhairavi M; Haddad, Nabil J

2007-01-01

108

Bigeminal pulmonary vein ectopy suppressed by pulmonary vein isolation.  

PubMed

A 58-year-old man with atrial fibrillation underwent pulmonary vein (PV) isolation (PVI). Bigeminal atrial premature beats persisted from the beginning of the PVI. The cardiac recordings from a basket catheter (BC) revealed the PV ectopic origin in the distal right superior PV. Successful PVI with the guidance of BC was confirmed by the appearance of concealed ectopy. Surprisingly, the PV ectopy completely disappeared immediately after the successful PVI. The findings suggest that the generation of PV trigger is sometimes dependent on left atrial input and that the underlying mechanism of the PV trigger may have been triggered activity or reentry. PMID:18360071

Yamada, Takumi; Murakami, Yoshimasa; Toyama, Junji; Murohara, Toyoaki

2008-01-01

109

The angiosome concept in clinical practice: implications for patient-specific recanalization procedures.  

PubMed

Below-the-knee (BTK) disease with the clinical presentation of critical limb ischemia is associated with a high rate of limb loss due to minor and major amputations. The main problem is to find a way to optimize blood flow to the critical limb area. BTK joint the down-stream diverges into 3 arms which supply different areas. Different concepts exist how optimal blood flow to the critical ischemic areas BTK can be achieved, either by treating as many vessels as can be reopened by an endovascular procedure, or by going for the two main BTK vessels, or in an outstanding situation also to treat the inflow of collaterals to achieve as much blood flow down the foot as possible. Derived from plastic surgery for the purpose of healing of flaps, the angiosome concept has been developed. An angiosome is an anatomic unit of tissue (consisting of skin, subcutaneous tissue, fascia, muscle and bone) fed by a source artery and drained by specific veins. From that point of view it can be presumed that revascularization of the source artery to the angiosome might result in better wound healing and limb salvage rates. The angiosome treatment concept of BTK disease refers to the concept in cardiology, where discrimination of reversible ischemia areas is made and respective vessels leading to these areas are treated in a distinctive way. PMID:24002385

Brodmann, M

2013-10-01

110

Eversion thromboendovenectomy in organized portal vein thrombosis during liver transplantation.  

PubMed

Portal thrombosis is no longer considered a contraindication for transplantation because of the technical experience acquired in the field of liver transplantation and the development of various surgical techniques. All the same, the results obtained in portal thrombosis patients are at times suboptimal, and the surgical technique used (thromboendovenectomy or veno-venous bypass) is also controversial. Between May 1988 and December 2001, 455 liver transplants were performed, of which 32 (7%) presented portal vein thrombosis. Of these, eight belonged to the first 227 transplants (group I), and 24 to the other 228 (group II). Of the 32 cases with portal thrombosis, 20 (62%) were type Ib, seven (22%) type II/III and five (16%) type IV. Twenty-two were males (69%), with a mean age of 50 yr (range: 30-70 yr); the thrombosis in all cases developed over a cirrhotic liver: 15 cases of an ethanolic origin, 11 because of hepatitis C virus, two cases of autoimmune aetiology, one case of primary biliary cirrhosis, one case because of hepatitis B virus and two cases of a cryptogenic origin. Five cases had a history of surgical treatment for portal hypertension. The surgical method in all cases consisted of an eversion thromboendovenectomy (ETEV) under direct visual guidance, with occlusion of the portal flow using a Fogarty balloon. Once re-canalization was achieved, we performed local heparinization and end-to-end portal anastomosis. In no case was systemic post-operative heparinization performed. In the 32 cases in which thrombectomy was attempted it was achieved in 31 of them (96%), failing only in a case of type IV thrombosis, which was resolved by portal arterialization. Of the 31 successful cases, only one with type IV thrombosis re-thrombosed. The 5-yr survival rate of the patients in the series was 69%, with 10 patients dying, of whom only two from causes related to the thrombosis and the thrombosis treatment, both with type IV thrombosis. The ideal treatment for portal thrombosis during liver transplantation is controversial and depends on its extension and the experience of the surgeon. In our experience, ETEV resolves most thromboses (types I, II and III), but management of type IV, which occasionally can be treated with this technique, may require more complex procedures such as bypass, portal arterialization or cavoportal haemitransposition. PMID:15108774

Robles, Ricardo; Fernandez, Juan Angel; Hernández, Quiteria; Marín, Caridad; Ramírez, Pablo; Sánchez-Bueno, Francisco; Luján, Juan Antonio; Rodríguez, José Manuel; Acosta, Francisco; Parrilla, Pascual

2004-02-01

111

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

112

Treatment of central retinal vein occlusion by injection of tissue plasminogen activator into a retinal vein  

Microsoft Academic Search

Purpose: To report the injection of tissue plasminogen activator into a retinal vein to treat central retinal vein occlusion.Methods: An 81-year-old woman with visual loss of the right eye secondary to central retinal vein occlusion developed central retinal vein occlusion and visual loss in her left eye. Treatment of her left eye with topical ocular hypotensive medications, pentoxifylline, and laser

Jeffrey N. Weiss

1998-01-01

113

[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

114

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

115

Facial vein draining into external jugular vein in humans: its variations, phylogenetic retention and clinical relevance  

Microsoft Academic Search

The superficial veins, especially the external jugular vein (EJV), are increasingly being utilized for cannulation to conduct diagnostic procedures or intravenous therapies. Ultrasound-guided venipuncture is a viable possibility in cases of variations in the patterns of superficial veins, and their knowledge is also important for surgeons doing reconstructive surgery. This study was done on 89 dissected adult cadavers (178 sides)

V. Gupta; A. Tuli; R. Choudhry; S. Agarwal; A. Mangal

2003-01-01

116

Magnetic Resonance Angiography of Thromboembolic Stroke in Rats: Indicator of Recanalization Probability and Tissue Survival After Recombinant Tissue Plasminogen Activator Treatment  

Microsoft Academic Search

Magnetic resonance angiography (MRA) was performed in a thromboembolic stroke model of the rat to characterize intracranial vessel occlusion patterns and to test its predictive power for tissue recovery after recombinant tissue plasminogen activator (rt-PA) treatment. After rt-PA–treated selective middle cerebral artery (MCA) occlusion, full recanalization was observed in two of three animals, whereas additional occlusion of the circle of

Thomas Hilger; Frank Niessen; Michael Diedenhofen; Konstantin-Alexander Hossmann; Mathias Hoehn

2002-01-01

117

21 CFR 880.6980 - Vein stabilizer.  

Code of Federal Regulations, 2010 CFR

...prongs. The device is placed on the skin so that the prongs are on either side of a vein and hold it stable while a hypodermic needle is inserted into the vein. (b) Classification. Class I (general controls). The device is exempt from the...

2010-04-01

118

Duplex ultrasonography in portal vein thrombosis  

Microsoft Academic Search

Duplex ultrasonography (US) was performed in 23 patients with portal vein thrombosis. In 7 children and 16 adults, duplex US demonstrated intraluminal thrombi (4 cases), thrombus and periportal collaterals (2 cases), and cavernomatous transformation of the portal vein (17 cases). Real-time US is a suitable means of demonstrating the anatomy of the portal venous system; pulsed Doppler provided information on

Z. Harkányi; M. Temesi; G. Varga; V. Weszelits

1989-01-01

119

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

120

21 CFR 880.6970 - Liquid crystal vein locator.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 2010-04-01 false Liquid crystal vein locator. 880.6970 Section 880...Miscellaneous Devices § 880.6970 Liquid crystal vein locator. (a) Identification. A liquid crystal vein locator is a device used to...

2010-04-01

121

21 CFR 880.6970 - Liquid crystal vein locator.  

Code of Federal Regulations, 2012 CFR

...2012-04-01 2012-04-01 false Liquid crystal vein locator. 880.6970 Section 880...Miscellaneous Devices § 880.6970 Liquid crystal vein locator. (a) Identification. A liquid crystal vein locator is a device used to...

2012-04-01

122

21 CFR 880.6970 - Liquid crystal vein locator.  

Code of Federal Regulations, 2013 CFR

...2013-04-01 2013-04-01 false Liquid crystal vein locator. 880.6970 Section 880...Miscellaneous Devices § 880.6970 Liquid crystal vein locator. (a) Identification. A liquid crystal vein locator is a device used to...

2013-04-01

123

21 CFR 880.6970 - Liquid crystal vein locator.  

...2014-04-01 2014-04-01 false Liquid crystal vein locator. 880.6970 Section 880...Miscellaneous Devices § 880.6970 Liquid crystal vein locator. (a) Identification. A liquid crystal vein locator is a device used to...

2014-04-01

124

21 CFR 880.6970 - Liquid crystal vein locator.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 2011-04-01 false Liquid crystal vein locator. 880.6970 Section 880...Miscellaneous Devices § 880.6970 Liquid crystal vein locator. (a) Identification. A liquid crystal vein locator is a device used to...

2011-04-01

125

Enhancing the contrast of subcutaneous veins  

NASA Astrophysics Data System (ADS)

A technique for enhancing the contrast of subcutaneous veins has been demonstrated. This technique uses a near infrared light source and one or more infrared sensitive CCD TV cameras to produce a contrast enhanced image of the subcutaneous veins. This video image of the veins is projected back onto the patient's skin using an LCD vein projector. The use of an infrared transmitting filter in front of the video cameras prevents any positive feedback from the visible light from the video projector from causing instabilities in the projected image. The demonstration contrast enhancing illuminator has been tested on adults, both Caucasian and African-American, and it enhances veins quite well in most cases. Preliminary studies on a 9 month old girl indicate promise for pediatric use.

Zeman, Herbert D.; Lovhoiden, Gunnar

1999-07-01

126

[News in the lower extremity veins morphology].  

PubMed

This comprehensive article notifies on the latest information concerning the morphology of the lower extremity veins, including their anatomical terminology. As a consequence of vehement development of the diagnostic and therapeutic techniques, the more detailed knowledge of anatomy, terminology, venous system variants and venous wall structure is necessary both for the phlebologists, sonographists and for the surgeons and cardiosurgeons. The histological part brings information about the content of collagen and elastin fibers in all layers of the superficial veins wall and about the arrangement of the vasa vasorum in both normal and varicose vena saphena magna. The anatomical-terminological part enlightens the variability of the superficial venous system of the lower extremity and the completion of the terminology of some superficial and deep veins, veins of the pelvis and perforating veins. The simple and clear anatomical terminology is the base for easy and non-problematic communication and discussion between inland and foreign specialists. PMID:19110951

Riedlová, J; Smrzová, T

2008-10-01

127

[Causes of postoperative recurrent varicose veins of lower extremities].  

PubMed

We analysed venograms of recurrent varicose veins in 180 cases (206 lower limbs). Deep vein valvular insufficiency resulted in varicose veins in 52.9% cases, and post-thrombotic syndrome in 18.9%. The causes of postoperative recurrent varicose veins varied: blindly performed single superficial veins operation, low ligation of the long saphenous trunk, incomplete stripping of varicose veins, missing of the short varicose saphena or incomplete ligation of the perforating veins and failure of deep vein valvular repairs. Venography is of value in making correct diagnosis and choosing appropriate operations. PMID:7553147

Gu, X; Yang, Z; Chen, J

1995-06-01

128

A Reappraisal of Saphenous Vein Grafting  

PubMed Central

Autologous saphenous vein grafting has been broadly used as a bypass conduit, interposition graft, and patch graft in a variety of operations in cardiac, thoracic, neurovascular, general vascular, vascular access, and urology surgeries, since they are superior to prosthetic veins. Modified saphenous vein grafts (SVG), including spiral and cylindrical grafts, and vein cuffs or patches, are employed in vascular revascularization to satisfy the large size of the receipt vessels or to obtain a better patency. A loop SVG helps flap survival in a muscle flap transfer in plastic and reconstructive surgery. For dialysis or transfusion purposes, a straight or loop arteriovenous fistula created in the forearm or the thigh with an SVG has acceptable patency. The saphenous vein has even been used as a stent cover to minimize the potential complications of standard angioplasty technique. However, the use of saphenous vein grafting is now largely diminished in treating cerebrovascular disorders, superior vena cava syndrome, and visceral revascularization due to the introduction of angioplasty and stenting techniques. The SVG remains the preferable biomaterial in coronary artery bypass, coronary ostioplasty, free flap transfer, and surgical treatment of Peyronie disease. Implications associated with saphenous vein grafting in vascular access surgery for the purpose of dialysis and chemotherapy are considerable. Vascular cuffs and patches have been developed as an important and effective means of enhancing the patency rates of the grafts by linking the synthetic material to the receipt vessel. In addition, saphenous veins can be a cell source for tissue engineering. We review the versatile roles that saphenous vein grafting has played as well as its current status in therapy. PMID:21245602

Yuan, Shi-Min; Jing, Hua

2011-01-01

129

MAPping Out Arteries and Veins  

NSDL National Science Digital Library

Growing evidence suggests that a genetic program specifies the identity of arteries and veins before the onset of circulation. A signaling cascade involving sonic hedgehog (Shh), vascular endothelial growth factor (VEGF), the VEGF receptor 2 (VEGFR2), homeobox proteins Foxc1 and Foxc2, the Notch receptor, and the downstream transcription factor gridlock is required for expression of arterial markers, whereas only a single transcription factor, COUP-TFII (chicken ovalbumin upstream promoter–transcription factor II), has previously been implicated in maintaining venous fate. Recent work has now implicated two competing pathways downstream of VEGFR2 in arterial versus venous specification: Activation of the phospholipase C–γ (PLC-γ)–mitogen-activated protein kinase (MAPK) pathway acts in arterial specification, whereas the phosphoinositide 3-kinase (PI3K)–Akt pathway acts to allow a venous fate by inhibition of the PLC-γ–MAPK pathway. Here, we review this work and discuss how activation of the MAPK signaling cascade could stimulate an arterial fate.

Ryan E. Lamont (Canada;University of Calgary, Calgary AB REV); Sarah Childs (Canada;University of Calgary, Calgary AB REV)

2006-10-03

130

Epithelioid hemangioendothelioma encasing the left brachiocephalic vein  

PubMed Central

Epithelioid hemangioendotheliomas are rare vascular tumors, often arising from medium to large veins in the extremities. Symptoms of these tumors vary depending upon location. Rarely, tumors may arise in chest and involve large vessels in the mediastinum. We present a case of a 17-year-old male presenting with compressive symptoms of the left upper extremity who was found to have a large epithelioid hemangioendothelioma encasing the left brachiocephalic vein. PMID:24898409

Long, Kristin; Skinner, Sean; Martin, Jeremiah

2014-01-01

131

Gross anatomy of primary varicose veins observed in endoscopic surgery.  

PubMed

The gross anatomy of varicose veins is one of the most important factors in the study of varicosity. Because of wide variations in the extent of involvement and degree of severity of varicose veins, it is difficult to obtain live and intact specimens of varicose veins. With good illumination and magnified monitor viewing, the varicositic main channel, its tributaries, and the incompetent perforating veins can be dissected and visualized clearly during endoscopic surgery. Thus, the whole range of varicosities can be observed directly in situ. Characteristic features of the varicosities of 350 limbs have been recorded by video and photographs for study and classification. These features include: 1) poor contractility of varicose veins; 2) dilated and tortuous changes of varicose veins; 3) saccular or lateral bulging deformities of vein walls, or both; 4) uniformly dilated and tortuous deformities of a long vein; 5) varicositic changes of the accessory vein; 6) anatomic abnormalities of varicose veins, such as supernumerary tributaries, varicositic clusters, and a crowded relationship among the long saphenous vein, perforating vein and tributaries; 7) various conditions of the perforating veins; and 8) the close relationship among the long saphenous vein, perforating veins, and the saphenous nerve. These data provide valuable information for the study and management of primary varicose veins. PMID:12461435

Lin, Sin-Daw; Chang, Kao-Ping; Yang, Yu-Li; Lee, Su-Shin; Lin, Tsai-Ming; Tsai, Chih-Cheng; Lai, Chung-Sheng

2002-12-01

132

Veins improve fracture toughness of insect wings.  

PubMed

During the lifetime of a flying insect, its wings are subjected to mechanical forces and deformations for millions of cycles. Defects in the micrometre thin membranes or veins may reduce the insect's flight performance. How do insects prevent crack related material failure in their wings and what role does the characteristic vein pattern play? Fracture toughness is a parameter, which characterises a material's resistance to crack propagation. Our results show that, compared to other body parts, the hind wing membrane of the migratory locust S. gregaria itself is not exceptionally tough (1.04±0.25 MPa?m). However, the cross veins increase the wing's toughness by 50% by acting as barriers to crack propagation. Using fracture mechanics, we show that the morphological spacing of most wing veins matches the critical crack length of the material (1132 µm). This finding directly demonstrates how the biomechanical properties and the morphology of locust wings are functionally correlated in locusts, providing a mechanically 'optimal' solution with high toughness and low weight. The vein pattern found in insect wings thus might inspire the design of more durable and lightweight artificial 'venous' wings for micro-air-vehicles. Using the vein spacing as indicator, our approach might also provide a basis to estimate the wing properties of endangered or extinct insect species. PMID:22927966

Dirks, Jan-Henning; Taylor, David

2012-01-01

133

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

134

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

135

Outcome of patients with pre-existing portal vein thrombosis undergoing arterialization of the portal vein during liver transplantation  

Microsoft Academic Search

Arterialization of the portal vein is being propagated as a technical possibility in liver transplant recipients with pre-existing portal vein thrombosis. In our own small series, portal vein arterialization (PVA) was carried out in four patients undergoing orthotopic liver transplantation. In three of these cases, the portal vein was anastomosed to the aorta via an interposed iliac artery, and in

Rudolf Ott; Cathrin Böhner; Susanna Müller; Thomas Aigner; Michaela Bussenius-Kammerer; Suleyman Yedibela; Hermann Kissler; Werner Hohenberger; Thomas Reck; Volker Müller

2003-01-01

136

Minor vein structure and sugar transport in Arabidopsis thaliana  

Microsoft Academic Search

.   Leaf and minor vein structure were studied in Arabidopsis thaliana (L.) Heynh. to gain insight into the mechanism(s) of phloem loading. Vein density (length of veins per unit leaf area) is\\u000a extremely low. Almost all veins are intimately associated with the mesophyll and are probably involved in loading. In transverse\\u000a sections of veins there are, on average, two companion

Edith Haritatos; Richard Medville; Robert Turgeon

2000-01-01

137

Cephalic Vein Transposition versus Vein Grafts for Venous Outflow in Free-flap Breast Reconstruction  

PubMed Central

Introduction: When recipient veins for free-flap breast reconstruction are unavailable or inadequate, vein grafts or cephalic vein transposition (CVT) an option to provide alternate venous outflow. There are no comparative data to elucidate the indications and outcomes for each. We hypothesize that the CVT is as reliable as vein grafts when indicated. Methods: All consecutive cases where a CVT or venous vein grafts were used for free-flap breast reconstruction between 2000 and 2012 were reviewed. Patient demographics, operative notes, indications, and flap survival were compared between the 2 groups. Results: Ten patients underwent a CVT and 38 patients received a vein graft for insufficient venous outflow. There were no differences in average age, body mass index, or comorbid conditions between the groups. Similarly, there was no difference in previous radiotherapy, timing of reconstruction, or side of reconstruction. A CVT was used for salvage following venous thrombosis in 7 patients (70.0%) and for primary venous outflow in the remaining patients due to inability to use the internal mammary vein. Vein grafts were performed primarily in 31 patients, 22 for augmenting venous drainage (supercharge), 9 for the dominant venous outflow, and 7 for salvage of a thrombosis. One patient in each group suffered a complete loss of the free flap (cephalic: 10.0% vs vein graft: 14.3%, P = 0.36). Conclusions: The CVT is a reliable alternate venous outflow that can be used as a primary recipient vein or as a salvage option following venous thrombosis. Surgeons should consider a CVT when primary recipient veins are compromised or unavailable. PMID:25289334

Chang, Edward I.; Fearmonti, Regina M.; Chang, David W.

2014-01-01

138

Batroxobin mobilizes circulating endothelial progenitor cells in patients with deep vein thrombosis.  

PubMed

Batroxobin, a thrombin-like enzyme from Bothrops atrox moojeni venom, is associated with the reduction of fibrinogen levels in plasma and the enhancement of anticoagulation and fibrinolysis. In this study, 15 patients with deep vein thrombosis (DVT) achieved successful limb salvage after the administration of batroxobin. We found that the levels of CD34+, CD31+, CD34+/CD31+, and vascular endothelial cadherin (VE-cadherin+) cells had increased in the peripheral blood of patients at 7 days and 14 days after treatment. At 0 day, 7 days, and 14 days, the percentages of CD34+ cells, which are assumed to be hematopoietic stem cells, are 0.39% ± 0.43%, 0.71% ± 0.50%, and 1.11% ± 0.66%, respectively. The levels of CD34+ cells at 14 days are significantly higher than the levels on the first day (P = .004). The levels of CD31+ cells and VE-cadherin+ cells, which represent mature endothelial cells, at 7 days (34.15% ± 11.32%, P = .013; 1.25% ± 1.39%, P = .014) and 14 days (35.21% ± 7.66%, P = .071; 1.85% ± 2.60%, P = .117) were slightly elevated compared with those at 0 day (27.55% ± 8.65%; 0.25 ± 0.39%). The double positive of CD34 and CD31 cells are assumed to be endothelial progenitor cells (EPCs). The levels of CD34+/CD31+ cells at 7 days (0.69% ± 0.50%, P = .001) and 14 days (1.07% ± 0.66%, P = .006) are significantly higher than that on the initial day (0.28% ± 0.30%). The number of CD34+/CD31+ cells significantly increased, indicating that in addition to its role in anticoagulation and fibrinolysis, treatment with batroxobin might simultaneously activate circulating EPCs that might promote the recanalization of the damaged vessel wall. PMID:19825915

Lei Zhang; Shi Hong Lu; Li Li; Tao, Yu-Guo; Yong Ling Wan; Senga, Hirobumi; Renchi Yang; Zhong Chao Han

2011-02-01

139

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

140

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

PubMed Central

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. PMID:5032782

Burkitt, Denis P.

1972-01-01

141

Animal Model of Acute Deep Vein Thrombosis  

SciTech Connect

Purpose: To develop an animal model of acute deep vein thrombosis (DVT). Methods: In part I of the study nine juvenile domestic pigs were used. Each external iliac vein was transluminally occluded with a balloon catheter. Thrombin was infused through a microcatheter in one leg according to one of the following protocols: (1) intraarterial (IA): 1250 U at 25 U/min in the common femoral artery (n= 3); (2) intravenous (IV): 5000 U in the popliteal vein at 500 U/min (n= 3), or at 100 U/min (n= 3). Saline was administered in the opposite leg. After the animals were killed, the mass of thrombus in the iliofemoral veins was measured. The pudendoepiploic (PEV), profunda femoris (PF), and popliteal veins (PV) were examined. Thrombosis in the tributaries of the superficial femoral vein (SFVt) was graded according to a three-point scale (0, +, ++). In part II of the study IV administration was further investigated in nine pigs using the following three regimens with 1000 U at 25 U/min serving as the control: (1) 1000 U at 100 U/min, (2) 250 U at 25 U/min, (3) 250 U at 6.25 U/min. Results: All animals survived. In part I median thrombus mass in the test limbs was 1.40 g as compared with 0.25 g in the controls (p= 0.01). PEV, PFV and PV were thrombosed in all limbs infused with thrombin. IV infusion was more effective in inducing thrombosis in both the parent veins (mass 1.32-1.78 g) and SVFt (++ in 4 of 6 legs), as compared with IA infusion (mass 0.0-1.16 g; SFVt ++ in 1 of 3 legs). In part II thrombus mass in axial veins ranged from 1.23 to 2.86 g, and showed no relationship with the dose of thrombin or the rate of infusion. Tributary thrombosis was less extensive with 250 U at 25 U/min than with the other regimens. Conclusion: Slow distal intravenous thrombin infusion in the hind legs of pigs combined with proximal venous occlusion induces thrombosis in the leg veins that closely resembles clinical DVT in distribution.

Roy, Sumit; Laerum, Frode [Institute for Surgical Research, National Hospital, N-0027 Oslo (Norway); Brosstad, Frank [Research Institute for Internal Medicine, National Hospital, N-0027 Oslo (Norway); Kvernebo, Knut [Department of Surgery, Ulleval Hospital, Kirkevien 166, N-0407 Oslo (Norway); Sakariassen, Kjell S. [Nycomed Bioreg A/S, Forskningsparken, Gaustadalleen 21, N-0371 Oslo (Norway)

1998-07-15

142

Optimization of subcutaneous vein contrast enhancement  

NASA Astrophysics Data System (ADS)

A technique for enhancing the contrast of subcutaneous veins has been demonstrated. This techniques uses a near IR light source and one or more IR sensitive CCD TV cameras to produce a contrast enhanced image of the subcutaneous veins. This video image of the veins is projected back onto the patient's skin using a n LCD video projector. The use of an IR transmitting filter in front of the video cameras prevents any positive feedback from the visible light from the video projector from causing instabilities in the projected image. The demonstration contrast enhancing illuminator has been tested on adults and children, both Caucasian and African-American, and it enhances veins quite well in all cases. The most difficult cases are those where significant deposits of subcutaneous fat are present which make the veins invisible under normal room illumination. Recent attempts to see through fat using different IR wavelength bands and both linearly and circularly polarized light were unsuccessful. The key to seeing through fat turns out to be a very diffuse source of RI light. Results on adult and pediatric subjects are shown with this new IR light source.

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

2000-05-01

143

A new approach for sclera vein recognition  

NASA Astrophysics Data System (ADS)

The vein structure in the sclera is stable over time, unique to each person, and well suited for human identification. A few researchers have performed sclera vein pattern recognition and reported promising initial results. Sclera recognition poses several challenges: the vein structure moves and deforms with the movement of the eye; images of sclera patterns are often defocused and/or saturated; and, most importantly, the vein structure in the sclera is multi-layered and has complex non-linear deformation. In this paper, we proposed a new method for sclera recognition: First, we developed a color-based sclera region estimation scheme for sclera segmentation. Second, we designed a Gabor wavelet-based sclera pattern enhancement method, and an adaptive thresholding method to emphasize and binarize the sclera vein patterns. Third, we proposed a line descriptor-based feature extraction, registration, and matching method that is illumination-, scale-, orientation-, and deformation-invariant, and can mitigate the multi-layered deformation effects exhibited in the sclera and tolerate segmentation error. It is empirically verified using the UBIRIS database that the proposed method can perform accurate sclera recognition.

Thomas, N. L.; Du, Yingzi; Zhou, Zhi

2010-04-01

144

Inadvertent Self-Detachment of Solitaire AB Stent during the Mechanical Thrombectomy for Recanalization of Acute Ischemic Stroke: Lessons Learned from the Removal of Stent via Surgical Embolectomy.  

PubMed

We recently experienced self-detachment of the Solitaire stent during mechanical thrombectomy of acute ischemic stroke. Then, we tried to remove the detached stent and to recanalize the occlusion, but failed with endovascular means. The following diffusion weighted image MRI revealed no significant increase in infarction size, therefore, we performed surgical removal of the stent to rescue the patient and to elucidate the reason why the self-detachment occurred. Based upon the operative findings, the stent grabbed the main thrombi but inadvertently detached at a severely tortuous, acutely angled, and circumferentially calcified segment of the internal carotid artery. Postoperative angiography demonstrated complete recanalization of the internal carotid artery. The patient's neurological deficits gradually improved, and the modified Rankin scale score was 2 at three months after surgery. In the retrospective case review, bone window images of the baseline computed tomography (CT) scan corresponded to the operative findings. According to this finding, we hypothesized that bone window images of a baseline CT scan can play a role in terms of anticipating difficult stent retrieval before the procedure. PMID:24003371

Kang, Dong-Hun; Park, Jaechan; Hwang, Yang-Ha; Kim, Yong-Sun

2013-06-01

145

Atrioesophageal fistula after cryoballoon pulmonary vein isolation.  

PubMed

The risk of atrioesophageal fistula after cryoballoon pulmonary vein isolation is thought to be much lower than after radiofrequency ablation, seeing that no data exist on this complication so far. We report for the first time on the occurrence of an atrioesophageal fistula 4 weeks after cryoballoon ablation at the site of the left inferior pulmonary vein. We suggest that even when using cryothermal ablation technique, an imaging modality to assess the proximity of esophagus and left atrium should be routinely performed to avoid this fatal complication. PMID:22486804

Stöckigt, Florian; Schrickel, Jan W; Andrié, René; Lickfett, Lars

2012-11-01

146

[Spontaneous recanalization after vasectomy].  

PubMed

Two cases of spontaneous recanalisation could be reoperated. The recanalisation was proved histologically. The reasons were analysed. The own technique is presented: resection of at least two centimeters of the vas, ligature, electrocoagulation, proximally turning-up fixation of the end, distally immersing the end in a tobacco-pouch. PMID:8119817

Pestalozzi, D M; Bannwart, F; Knönagel, H

1993-12-01

147

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

148

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 smoking obesity swine flu high blood pressure parkinson's stress depression muscle stiffness heart attack arthritis prostate disease bladder infection incontinence cancer varicose veins smoking obesity swine flu

Diggle, Peter J.

149

Why Do Some Pregnant Women Get Varicose Veins?  

MedlinePLUS

... Social Media: Connect With Us Why Do Some Pregnant Women Get Varicose Veins? KidsHealth > Parents > Q&A > Pregnancy and Infants > Why Do Some Pregnant Women Get Varicose Veins? Print A A A Text ...

150

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

E-print Network

these fractures initiate where they do and how the vein evolves once started. We studied veins from the Lower Ordovician Mazarn Formation in the Arkansas’ Ouachitas combining textural observations, stable isotopes, fluid inclusions, SEM-based cathodoluminescence...

Cervantes, Pablo

2009-05-15

151

Portal vein embolization before major hepatectomy  

Microsoft Academic Search

Abstract Abstract Abstract Abstract To discuss the rationale, techniques and the unsolved issues regarding preoperative portal vein embolization (PVE) before major hepatectomy. After a systematic search of Pubmed, we reviewed and retrieved literature related to PVE. Preoperative PVE is an approach that is gaining increasing acceptance in the preoperative treatment of selected patients prior to major hepatic resection. Induction of

Hai Liu; Yong Fu

152

Deep vein thrombosis: related to anemophilous pollen?  

PubMed

The etiology of deep vein thrombosis (DVT) is still not elucidated nowadays. Based on the accordance between DVT incidence and the anemophilous pollen concentration in the air, we proposed the hypothesis that allergic reaction induced by anemophilous pollen may cause "idiopathic" DVT, and proinflammatory factors may play an important role in the thrombosis process. PMID:21823027

Zhou, Bin; Li, Yiqing; Shang, Dan; Dang, Yiping; Wang, Weici; Sheng, Shi; Kong, Xianghai; Jin, Bi

2011-08-01

153

Thoracic Outlet Decompression for Subclavian Vein Thrombosis  

Microsoft Academic Search

Hypothesis:Thereisadifferenceinoutcomeswhenpa- tients have neurogenic thoracic outlet syndrome in ad- dition to subclavian vein thrombosis. Methods: Analysis of a prospectively developed data- base, medical record review, and a patient question- naire were used to summarize clinical experience from December 1990 to December 2001 on the basis of the patient's original evaluation. Patients were stratified on the presence (group 1) or absence

Vasu Divi; Mary C. Proctor; David A. Axelrod; Lazar J. Greenfield

2005-01-01

154

Endoscopic vein harvesting: technique, outcomes, concerns & controversies  

PubMed Central

The choice of the graft conduit for coronary artery bypass grafting (CABG) has significant implications both in the short- and long-term. The patency of a coronary conduit is closely associated with an uneventful postoperative course, better long-term patient survival and superior freedom from re-intervention. The internal mammary artery is regarded as the primary conduit for CABG patients, given its association with long-term patency and survival. However, long saphenous vein (LSV) continues to be utilized universally as patients presenting for CABG often have multiple coronary territories requiring revascularization. Traditionally, the LSV has been harvested by creating incisions from the ankle up to the groin termed open vein harvesting (OVH). However, such harvesting methods are associated with incisional pain and leg wound infections. In addition, patients find such large incisions to be cosmetically unappealing. These concerns regarding wound morbidity and patient satisfaction led to the emergence of endoscopic vein harvesting (EVH). Published experience comparing OVH with EVH suggests decreased wound related complications, improved patient satisfaction, shorter hospital stay, and reduced postoperative pain at the harvest site following EVH. Despite these reported advantages concerns regarding risk of injury at the time of harvest with its potential detrimental effect on vein graft patency and clinical outcomes have prevented universal adoption of EVH. This review article provides a detailed insight into the technical aspects, outcomes, concerns, and controversies associated with EVH. PMID:24251019

Sarang, Zubair

2013-01-01

155

Central retinal vein occlusion in young people  

Microsoft Academic Search

In a study performed on 20 subjects with central retinal vein occlusion (CRVO) aged 40 years or less we found the ischemic form in 20%. Disc edema was a common finding at the onset, while macular edema was less frequently seen. Systemic or ocular disorders that could be related with the development of the CRVO were often found; a patient

Giuseppe Giuffré; Gaetano Randazzo-Papa; Carlo Palumbo

1992-01-01

156

Management of Central Retinal Vein Occlusion  

Microsoft Academic Search

The management of central retinal vein occlusion (CRVO) is discussed briefly. Since the prognosis, complications, visual outcome and management of nonischemic and ischemic CRVO are very different, the first essential step in the management of CRVO is to determine which type of CRVO one is dealing with. The various parameters which help to differentiate the two types reliably are described

Sohan Singh Hayreh

2003-01-01

157

Progression of Nonischemic Central Retinal Vein Occlusion  

Microsoft Academic Search

Progression of nonischemic central retinal vein occlusion (CRVO) to ischemic CRVO occurs in up to 5–20 % of patients with nonischemic CRVO. Eyes presenting with nonischemic CRVO and exhibiting an increase in intraretinal hemorrhages together with angiographic findings of aggravation of venule wall staining were assumed to be showing early signs of progression. Eight eyes of 7 patients were followed

A. Pollack; H. Leiba; M. Oliver

1997-01-01

158

Central retinal vein occlusion and thrombophilia  

Microsoft Academic Search

Central retinal vein occlusion is one of the commonest vascular diseases of the eye. The pathogenesis is multifactorial with both local factors and systemic diseases being aetiologically important. Many thrombophilic conditions have recently been identified and studies looking at their potential role in CRVO have been undertaken. The aim of this review is to critically appraise these studies as to

C D Fegan

2002-01-01

159

Preoperative portal vein embolization for hepatocellular carcinoma  

Microsoft Academic Search

As a countermeasure to portal tumor thrombi, which are a serious danger in liver cancer, we did portal vein embolization (PVE) during percutaneous transhepatic portography. Our 21 patients later underwent hepatic resection. After PVE, portal pressure increased and there was slight liver function damage, but this procedure was safer than transarterial embolization (TAE). We examined the pathologic specimens to view

Hiroaki Kinoshita; Katsuji Sakai; Kazuhiro Hirohashi; Sumito Igawa; Osamu Yamasaki; Shoji Kubo

1986-01-01

160

Omental vein catheter thrombolysis for acute porto-mesenteric vein thrombosis.  

PubMed

Mesenteric venous thrombosis (MVT) is an uncommon clinical condition with potential high morbidity. We report here a patient who presented with acute-onset MVT and bowel infarction, which was successfully ameliorated with intramesenteric vein thrombolytic therapy. PMID:23566871

Fonseca, Annabelle L; Cleary, Muriel A; Cholewczynski, Walter; Sumpio, Bauer E; Atweh, Nabil A

2013-05-01

161

Hepatopetal collaterals after portal vein thrombosis following liver transplantation  

Microsoft Academic Search

Two liver transplant patients with hepatopetal collaterals after portal vein thrombosis are described. Angiographically, the\\u000a appearance is similar to cavernous transformation of the portal vein. The demonstration of hepatopetal collaterals is diagnosic\\u000a of portal vein occlusion from whatever cause. After portal vein occlusion, collaterals develop from preexisting periportal\\u000a vessels which undergo compensatory enlargement and reconstitute the intraheptic portal vessels. In

Albert B. Zajko; Klaus M. Bron

1986-01-01

162

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

163

Portal vein absence and nodular regenerative hyperplasiaof the liver with giant inferior mesenteric vein  

Microsoft Academic Search

.   We present a patient with nodular regenerative hyperplasia of the liver (NRH) and portal vein absence studied with CT, MR\\u000a imaging, and MR angiography. The most striking feature was exuberant hemorrhoids due to a giant hepatofugal inferior mesenteric\\u000a vein. A relationship between unbalanced portal blood flow and nodular regenerative transformation of the liver is suggested\\u000a in this patient.

E. Arana; L. Martí-Bonmatí; V. Martínez; M. Hoyos; H. Montes

1997-01-01

164

Pulsed Doppler duplex sonography and CT of portal vein thrombosis  

Microsoft Academic Search

Five patients with partial or complete portal vein thrombosis were examined by both computed tomography (CT) and pulsed Doppler duplex scanning. Duplex scanning correctly identified portal vein thrombosis in all five. Duplex sonography may be the preferred technique to detect and follow portal vein thrombosis because of lower cost, lack of need for intravenous contrast material, and easier availability for

Valerie E. Miller; Lincoln L. Berland

1985-01-01

165

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

166

Axial Length and Refraction in Retinal Vein Occlusions  

Microsoft Academic Search

To assess whether axial length and refraction are risk factors for retinal vein occlusion, we measured these parameters in 88 consecutive patients with unilateral branch retinal vein occlusion (BRVO), in 58 consecutive patients with unilateral central retinal vein occlusion (CRVO) and in 50 patients selected as a control group. Patients and controls were free or affected by systemic or local

Francesco Bandello; Alessandra Tavola; Luisa Pierro; Giulio Modorati; Claudio Azzolini; Rosario Brancato

1998-01-01

167

Systemic diseases associated with various types of retinal vein occlusion  

Microsoft Academic Search

PURPOSE: To investigate systemic diseases associated with various types of retinal vein occlusion.METHODS: We investigated prospectively in 1090 consecutive patients with retinal vein occlusion, almost all Caucasian (consistent with the racial pattern here), the prevalence of associated systemic disorders before or at the onset of various types of retinal vein occlusion. The patients were categorized into six types of retinal

Sohan Singh Hayreh; Bridget Zimmerman; Mark J. McCarthy; Patricia Podhajsky

2001-01-01

168

Isolated Left-sided Scimitar Vein Connecting All Left Pulmonary Veins to the Right Inferior Vena Cava  

Microsoft Academic Search

When the common pulmonary vein fails to develop, the embryonic connections of the pulmonary veins to one or more of the systemic\\u000a veins almost always persist. Anomalous pulmonary venous connections to the inferior vena cava (IVC) are typically characterized\\u000a by hypoplasia of the involved pulmonary veins and pulmonary artery, as well as abnormal parenchyma of the involved lung. Such\\u000a cases

A. L. Juraszek; H. Cohn; R. Van Praagh; S. Van Praagh

2005-01-01

169

Ophthalmodynamometric assessment of the central retinal vein collapse pressure in eyes with retinal vein stasis or occlusion  

Microsoft Academic Search

Purpose. Using a new Goldmann contact lens associated ophthalmodynamometric device, it was the purpose of the present study to determine the central retinal vein collapse pressure in eyes with retinal vein occlusions or retinal venous stasis.Methods. The prospective clinical non-interventional comparative study included 19 patients with central retinal vein occlusion (n=8), branch retinal vein occlusion (n=4), or retinal venous stasis

Jost B. Jonas

2003-01-01

170

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

171

Transcutaneous laser treatment of leg veins.  

PubMed

Leg telangiectasias and reticular veins are a common complaint affecting more than 80% of the population to some extent. To date, the gold standard remains sclerotherapy for most patients. However, there may be some specific situations, where sclerotherapy is contraindicated such as needle phobia, allergy to certain sclerosing agents, and the presence of vessels smaller than the diameter of a 30-gauge needle (including telangiectatic matting). In these cases, transcutaneous laser therapy is a valuable alternative. Currently, different laser modalities have been proposed for the management of leg veins. The aim of this article is to present an overview of the basic principles of transcutaneous laser therapy of leg veins and to review the existing literature on this subject, including the most recent developments. The 532-nm potassium titanyl phosphate (KTP) laser, the 585-600-nm pulsed dye laser, the 755-nm alexandrite laser, various 800-983-nm diode lasers, and the 1,064-nm neodymium yttrium-aluminum-garnet (Nd:YAG) laser and various intense pulsed light sources have been investigated for this indication. The KTP and pulsed dye laser are an effective treatment option for small vessels (<1 mm). The side effect profile is usually favorable to that of longer wavelength modalities. For larger veins, the use of a longer wavelength is required. According to the scarce evidence available, the Nd:YAG laser produces better clinical results than the alexandrite and diode laser. Penetration depth is high, whereas absorption by melanin is low, making the Nd:YAG laser suitable for the treatment of larger and deeply located veins and for the treatment of patients with dark skin types. Clinical outcome of Nd:YAG laser therapy approximates that of sclerotherapy, although the latter is associated with less pain. New developments include (1) the use of a nonuniform pulse sequence or a dual-wavelength modality, inducing methemoglobin formation and enhancing the optical absorption properties of the target structure, (2) pulse stacking and multiple pass laser treatment, (3) combination of laser therapy with sclerotherapy or radiofrequency, and (4) indocyanin green enhanced laser therapy. Future studies will have to confirm the role of these developments in the treatment of leg veins. The literature still lacks double-blind controlled clinical trials comparing the different laser modalities with each other and with sclerotherapy. Such trials should be the focus of future research. PMID:24220848

Meesters, Arne A; Pitassi, Luiza H U; Campos, Valeria; Wolkerstorfer, Albert; Dierickx, Christine C

2014-03-01

172

Comprehensive Management of Subclavian Vein Effort Thrombosis  

PubMed Central

Subclavian vein (SCV) effort thrombosis, also known as the Paget-Schroetter syndrome, is a relatively uncommon condition that affects young, active, otherwise healthy individuals. It is considered a form of thoracic outlet syndrome, arising as a consequence of compression and repetitive injury of the SCV between the first rib and the overlying clavicle, as well as the anterior scalene muscle, subclavius muscle, and costoclavicular ligament. Effort thrombosis is distinct from other forms of deep vein thrombosis with respect to pathophysiology, clinical presentation, and functional consequences, and it requires treatment considerations unique to effective management of thoracic outlet compression as well as the obstructed SCV. In this review the comprehensive management of SCV effort thrombosis is addressed, with an emphasis on current interventional radiology techniques used in conjunction with definitive surgical treatment, based on early catheter-based venography, thrombolytic therapy, and prompt paraclavicular thoracic outlet decompression with direct SCV reconstruction. PMID:23448848

Thompson, Robert W.

2012-01-01

173

Electroretinography in central retinal vein occlusion  

Microsoft Academic Search

In 149 eyes with central retinal vein occlusion (CRVO), we prospectively investigated the role of routine, clinical electroretinography (ERG) in differentiating ischemic (60 eyes) from nonischemic CRVO (89 eyes). Single-flash photopic and scotopic ERGs were recorded. Data for the amplitudes and implicit times of a- and b-waves and for the b-\\/a-wave amplitude ratio were analyzed in detail. The study revealed

Sohan Singh Hayreh; Marie R. Klugman; Patricia Podhajsky; Hansjoerg E. Kolder

1989-01-01

174

Retrospective Comparison of Clinical Outcomes between Endovenous Laser and Saphenous Vein-sparing Surgery for Treatment of Varicose Veins  

Microsoft Academic Search

Background  The purpose of the present study was to compare management of varicose veins by endovenous laser ablation (EVL) and a vein-sparing\\u000a procedure (CHIVA: Conservatrice et Hémodynamique de l’Insuffisance Veineuse en Ambulatoire) for management of varicose veins.\\u000a \\u000a \\u000a \\u000a \\u000a Methods  Data from 82 consecutive patients with great saphenous vein (GSV) reflux and primary varicose veins presenting to the vascular\\u000a clinic at the Far Eastern

Chih-Yang Chan; Tzu-Chun Chen; Yung-Kun Hsieh; Jih-Hsin Huang

175

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

176

Metabolic effects of portal vein sensing.  

PubMed

The extrinsic gastrointestinal nerves are crucial in the sensing of nutrients and hormones and its translation in terms of control of food intake. Major macronutrients like glucose and protein are sensed by the extrinsic nerves located in the portal vein walls, which signal to the brain and account for the satiety phenomenon they promote. Glucose is sensed in the portal vein by neurons expressing the glucose receptor SGLT3, which activate the main regions of the brain involved in the control of food intake. Proteins indirectly act on food intake by inducing intestinal gluconeogenesis and its sensing by the portal glucose sensor. The mechanism involves a prior antagonism by peptides of the ?-opioid receptors present in the portal vein nervous system and a reflex arc with the brain inducing intestinal gluconeogenesis. In a comparable manner, short-chain fatty acids produced from soluble fibre act via intestinal gluconeogenesis to exert anti-obesity and anti-diabetic effects. In the case of propionate, the mechanism involves a prior activation of the free fatty acid receptor FFAR3 present in the portal nerves and a reflex arc initiating intestinal gluconeogenesis. PMID:25200297

Mithieux, G

2014-09-01

177

[Recurrent varicose veins. Surgical procedure--results].  

PubMed

We report 96 patients (107 legs) with recurrence after varicose vein surgery. We define a recurrent varicose vein as a new transfascial insufficiency after incomplete interruption of the saphenofemoral as well as popliteal junction with reflux in the epifascial venous system. 92 patients underwent external primary surgery. Morphologically an insufficient high ligation of the V. saphena magna (Moszkowicz's operation) led in 30 cases to a recurrent varicose vein. In 47 cases an incomplete isolated, in 29 cases an incomplete saphenofemoral ligation during a Babcock procedure and in one case an incomplete saphenopopliteal ligation for V. saphena parva insufficiency were the reasons for the recurrence. As recurrent surgery we performed 106 ligations of the saphenofemoral junction. In 38 of these cases an isolated saphenofemoral ligation and in 68 cases an additional stage-adjusted ligation of the V. saphena magna were carried out. In one case of recurrent saphenopopliteal insufficiency a repeated ligation of the V. saphena parva was performed. The recurrence is an avoidable complication of a not perfect primary surgery. The main cause is an inadequate access with incomplete saphenofemoral or -popliteal ligation. PMID:11503464

Pourhassan, S; Zarras, K; Mackrodt, H G; Stock, W

2001-07-01

178

Hepatectomy With Portal Vein Resection for Hilar Cholangiocarcinoma  

PubMed Central

Objective: To better determine the role of portal vein resection and its effect on survival, as well as to appreciate the impact of portal vein invasion on prognosis in hilar cholangiocarcinoma. Summary Background Data: Hepatectomy with portal vein resection is sometimes performed for locally advanced hilar cholangiocarcinoma. However, the significance of microscopic invasion of the portal vein has not been determined. Methods: Medical records of 160 patients with hilar cholangiocarcinoma who underwent macroscopically curative hepatectomy with (n = 52) or without portal vein resection (n = 108) were reviewed. Invasion of the portal vein was assessed histologically on the surgical specimen, and results were correlated with clinicopathologic features and survival. Results: Surgical mortality, including all hospital deaths, was similar in patients who did and did not undergo portal vein resection (9.6% vs. 9.3%), but the primary tumor was more advanced in patients who underwent portal vein resection. Histologically, no invasion was found in 16 (30.8%) of resected portal veins. However, dense fibrosis adjacent to the portal vein was common, and the mean distance between the leading edge of cancer cells and the adventitia of the portal vein was 437 ± 431 ?m. The prognosis was worse in patients with than without portal vein resection (5-year survival, 9.9% vs. 36.8%; P < 0.0001). The presence or absence of microscopic invasion of the resected portal vein did not influence survival (16.6 months in patients with microscopic invasion vs. 19.4 months in those without; P = 0.1506). Multivariate analysis identified histologic differentiation, lymph node metastasis, and macroscopic portal vein invasion as independent prognostic factors. Conclusions: Microscopic invasion of the portal vein may be misdiagnosed clinically in patients with hilar cholangiocarcinoma. However, the distance between tumor and adventitia is so narrow that curative resection without portal vein resection is unlikely to be possible. Gross portal vein invasion has a negative impact on survival, and hepatectomy with portal vein resection can offer long-term survival in some patients with advanced hilar cholangiocarcinoma. PMID:14578735

Ebata, Tomoki; Nagino, Masato; Kamiya, Junichi; Uesaka, Katsuhiko; Nagasaka, Tetsuro; Nimura, Yuji

2003-01-01

179

Occlusion of azygos vein via direct percutaneous puncture of innominate vein following cavopulmonary anastomosis.  

PubMed

A 2-year-10-month-old boy was diagnosed with a complex congenital heart disease: right atrial isomerism, left superior vena cava (LSVC), complete atrioventricular septal defect, secundum type atrial septal defect, transposition of the great arteries with pulmonary atresia, patent ductus arteriosus, absence of a right superior vena cava (RSVC), and dextrocardia. He had received a left Blalock-Taussig (BT) shunt at the age of 3 months and a left bidirectional Glenn shunt one year after BT shunt. Progressive cyanosis was noted after the second operation and cardiac catheterization showed a functional Glenn shunt with an engorged azygos vein, which was inadvertently skipped for ligation. Because of the absence of RSVC, transcatheter occlusion of the azygos vein was performed successfully via direct puncture of the innominate vein. PMID:10850539

Chen, M R; Yang, F S

2000-03-01

180

Anomalous formation of external jugular vein and its clinical implication  

PubMed Central

Introduction: The superficial veins, especially the external jugular vein (EJV), are increasingly being utilized for cannulation to conduct diagnostic procedures or intravenous therapies. EJV is also used in microsurgical procedures,used as a recipient for the free flaps. Materials and Methods: During routine dissection a variation was observed in the formation of EJV unilaterally on the left side. Result: In the anterior triangle of the neck submandibular vein joined with the anterior jugular vein to form a large venous trunk (V1). Facial vein joined this venous trunk (V1) to form another common channel (V2). The retromandibular vein divided into unusually long anterior and posterior divisions. Anterior division did not join the facial vein but drained into the common channel V2.The posterior division of retromandibular vein also drained into V2 which further continued as EJV and drained into the subclavian vein. Conclusion: The knowledge of variations in the patterns of superficial veins is important for the surgeons to avoid any intraoperative error which might lead to unnecessary bleeding. PMID:22442610

Chauhan, Navneet Kumar; Rani, Archana; Chopra, Jyoti; Rani, Anita; Srivastava, A. K.; Kumar, Vijay

2011-01-01

181

Bedding parallel veins and their relationship to folding  

NASA Astrophysics Data System (ADS)

Laminated bedding parallel veins hosted in turbiditic sandstone shale sequences from central Victoria, Australia, consist of stacked, millimetre thick, sub-parallel sheets of quartz separated by micaceous layers, wall rock slivers and pressure solution seams. They have very high length to thickness ratios, are laterally continuous over tens to hundreds of metres, and have relatively uniform thickness compared to other vein types. They are intimately associated with and folded by chevron folds, and the quartz grain shape elongation lineation is commonly orthogonal to mesoscopic and macroscopic fold hinge lines. The bedding parallel veins have two morphological forms. Type I are thin (commonly 5-10 cm) laminated veins which have complex microstructures dominated by phyllosilicate inclusion surfaces, related to oblique opening along bedding with varying rates of deposition (opening) relative to shear displacement (slip) along the bedding surfaces. More common are Type II, thicker (generally <20 cm), banded veins of alternating milky-white quartz with wall rock inclusion laminae (formerly fragments) bounded by stylolitic partings parallel to both bedding and the vein margins. The inclusion surfaces in Type I veins track the opening direction during vein formation. Vein opening-sense criteria suggest cyclical pore fluid pressure fluctuations which predate the amplification and propagation of the host chevron folds; i.e. prior to attainment of significant limb dip. Different layer parallel shortening and amplification rates for individual layers within the sedimentary sequence may lead to bedding parallel veins with an opening sense unrelated to the flexural slip folds which eventually follow.

Jessell, M. W.; Willman, C. E.; Gray, D. R.

1994-06-01

182

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.

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

2014-01-01

183

Deep vein thrombosis chemoprophylaxis in plastic surgery.  

PubMed

The practice of plastic surgery is a unique mixture of art and science, and both must be carefully balanced to provide the best possible care for patients. To do that, clinicians should be practicing evidence-based medicine. This article discusses the prevalence and risks associated with deep vein thrombosis and the reasons and options for its possible chemoprophylaxis. Until evidence-based medicine best-practice recommendations can be developed, it would be prudent for clinicians to empirically select and consistently apply a risk stratification system and prophylaxis regimen of their choice for the benefit of their patients. PMID:23830748

Gold, Alan

2013-07-01

184

Prognostic Evaluation Based on Cortical Vein Score Difference in Stroke  

PubMed Central

Background and Purpose Multimodal imaging in acute ischemic stroke defines the extent of arterial collaterals, resultant penumbra, and associated infarct core, yet limitations abound. We identified superficial and deep venous drainage patterns that predict outcomes in patients with a proximal arterial occlusion of the anterior circulation. Methods An observational study that used computed tomography (CT) angiography to detail venous drainage in a consecutive series of patients with a proximal anterior circulation arterial occlusion. The principal veins that drain the cortex (superficial middle cerebral, vein of Trolard, vein of Labbé, and basal vein of Rosenthal) and deep structures were scored with a categorical scale on the basis of degree of contrast enhancement. The Prognostic Evaluation based on Cortical vein score difference In Stroke score encompassing the interhemispheric difference of the composite scores of the veins draining the cortices (superficial middle cerebral+vein of Trolard+vein of Labbé+basal vein of Rosenthal) was analyzed with respect to 90-day modified Rankin Scale outcomes. Results Thirty-nine patients were included in the study. A Prognostic Evaluation based on Cortical vein score difference In Stroke score of 4 to 8 accurately predicted poor outcomes (modified Rankin Scale, 3–6; odds ratio, 20.53; P<0.001). On stepwise logistic regression analyses adjusted for CT Alberta stroke program early CT score, CT angiography collateral grading and National Institutes of Health Stroke Scale score, a Prognostic Evaluation based on Cortical vein score difference In Stroke score of 4 to 8 (odds ratio, 23.598; P=0.009) and an elevated admission National Institutes of Health Stroke Scale (odds ratio, 1.423; P=0.023) were independent predictors of poor outcome. Conclusions The Prognostic Evaluation based on Cortical vein score difference In Stroke score, a novel measure of venous enhancement on CT angiography, accurately predicts clinical outcomes. Venous features on computed tomography angiography provide additional characterization of collateral perfusion and prognostication in acute ischemic stroke. PMID:23887836

Parthasarathy, Rajsrinivas; Kate, Mahesh; Rempel, Jeremy L.; Liebeskind, David S.; Jeerakathil, Thomas; Butcher, Kenneth S.; Shuaib, Ashfaq

2014-01-01

185

Kinematics of crystal growth in syntectonic fibrous veins  

Microsoft Academic Search

Abstract--Detaded observations of a set of fibrous antitaxial calcite veins in a slate reveal that some,of the calcite fibres do not connect material markers,on both sides of the vein and can therefore not have tracked the full opening trajectory dunng,vein growth. Thts calls for a better understanding,of the mechanisms,of fibre formation and reliable criteria to test the tracking hypothesis. Based

J. L. Urai; P. F. Williams; H VANROERMUND

1991-01-01

186

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

187

Auxin Is Required for Leaf Vein Pattern in Arabidopsis  

Microsoft Academic Search

To investigate possible roles of polar auxin transport in vein patterning, cotyledon and leaf vein patterns were compared for plants grown in medium containing polar auxin transport inhibitors (N-1-naphthylphthalamic acid, 9-hydroxyfluorene-9-carboxylic acid, and 2,3,5-triiodobenzoic acid) and in medium containing a less well-characterized inhibitor of auxin-mediated processes, 2-(p- chlorophynoxy)-2-methylpropionic acid. Cotyledon vein pattern was not affected by any inhibitor treatments, although

Leslie E. Sieburth

1999-01-01

188

An idiopathic azygos vein aneurysm mimicking a mediastinal mass.  

PubMed

Azygos vein aneurysms are very rare causes of mediastinal masses and are usually accidental findings on chest roentgenography. Most are detected in patients with portal hypertension or venous malformations. An idiopathic azygos vein aneurysm is assumed to be congenital and is much more exceptional. We present the case of a 76-year-old man who underwent excision of an idiopathic azygos vein aneurysm by video-assisted thoracoscopic surgery (VATS). PMID:24996721

Ichiki, Yoshinobu; Hamatsu, Takayuki; Suehiro, Taketoshi; Koike, Makiko; Tanaka, Fumihiro; Sugimachi, Keizo

2014-07-01

189

Pulsed Doppler duplex sonography and CT of portal vein thrombosis  

SciTech Connect

Five patients with partial or complete portal vein thrombosis were examined by both computed tomography (CT) and pulsed Doppler duplex scanning. Duplex scanning correctly identified portal vein thrombosis in all five. Duplex sonography may be the preferred technique to detect and follow portal vein thrombosis because of lower cost, lack of need for intravenous contrast material, and easier availability for multiple follow-up examinations.

Miller, V.E.; Berland, L.L.

1985-07-01

190

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

191

Computed tomography findings in pseudothrombosis of the iliofemoral vein.  

PubMed

Computed tomography findings in 3 patients with apparent thrombosis of an iliofemoral vein due to mixing artifact related to venous collateral formation are presented, 1 with portosystemic collaterals and 2 with collaterals secondary to subclavian vein thrombosis. Mixing artifact or asymmetric enhancement related to collateral formation should be considered for an apparent thrombus in the iliofemoral vein. Examination of axial and reformatted images may facilitate recognition and help avoid an erroneous diagnosis of deep venous thrombosis. PMID:20118738

Desai, Gaurav; Poder, Liina; Wang, Zhen J; Yeh, Benjamin M; Webb, Emily M; Coakley, Fergus V

2010-01-01

192

[Video endoscopy-assisted saphenous vein occlusion--minimal invasive concept for treatment of varicose veins].  

PubMed

Videoendoscopy-assisted saphena occlusion (VASO) is an minimally invasive technique for the treatment of varicosis with crossectomy, dissection of perforating veins and occlusion of the saphena by endoscopic control. The advantages are lower level of pain, remobilisation without problems, and fewer complications of wound healing. Early results correspond to stripping. PMID:9102018

Klose, G; Weber, B

1996-01-01

193

Advantages of using volar vein repair in finger replantations.  

PubMed

Providing adequate venous outflow is essential in finger replantation surgeries. For a successful result, the quality and quantity of venous repairs should be adequate to drain arterial inflow. The digital dorsal venous plexus is a reliable source of material for venous repairs. Classically, volar digital veins have been used only when no other alternative was available. However, repairing volar veins to augment venous outflow has a number of technical advantages and gives a greater chance of survival. Increasing the repaired vein:artery ratio also increases the success of replantation. The volar skin, covering the volar vein, is less likely to be avulsed during injury and is also less likely to turn necrotic, than dorsal skin, after the replantation surgery. Primary repair of dorsal veins can be difficult due to tightness ensuing from arthrodesis of the underlying joint in flexion. In multiple finger replantations, repairing the volar veins after arterial repair and continuing to do so for each finger in the same way without changing the position of the hand and surgeon save time. In amputations with tissue loss, the size discrepancy is less for volar veins than for dorsal veins. We present the results of 366 finger replantations after volar vein repairs. PMID:23982066

Mersa, Berkan; Kabakas, Fatih; Pürisa, Hüsrev; Özçelik, Ismail Bülent; Ye?ilo?lu, Nebil; Sezer, Ilker; Tunçer, Serdar

2014-01-01

194

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

195

Can deep vein thrombosis be predicted after varicose vein operation in women in rural areas?  

PubMed

Introduction. Chronic venous disease is a group of symptoms caused by functional and structural defects of the venous vessels. One of the most common aspects of this disease is the occurrence of varicose veins. There are many ways of prevention and treatment of varicose veins, but in Poland the leading one is still surgery. As in every medical procedure there is the possibility of some complications. One of them is deep vein thrombosis (DVT). The diagnosis of DVT can be difficult, especially when access to a specialist is limited, such as in case of rural patients. The aim of the study. The aim of the study was estimation of the influence of LMWH primary prophylaxis on the formation of postoperative DVT, as well as sensitivity and specificity of clinical examination and D-dimer value in diagnosis of postoperative DVT in women. Materials and methods. The study was conducted in a group of 93 women operated on in the Department of General, Vascular Surgery and Angiology at the Karol Marcinkowski University of Medical Sciences in Pozna?, Poland. The patients had undergone a varicose vein operation and were randomly divided into two groups: A - 48 women receiving LMWH during two days of the perioperative period, B - 45 women receiving LMWH during seven days of the perioperative period. Results. There was no significant difference in the postoperative DVT complications in both groups. The value of D-dimer > 0.987 mcg/ml and swelling > 1.5 cm of shin (in comparison to the preoperative period) plays a significant role in diagnosis of DVT. Conclusions. The extended primary prophylaxis with LMWH does not affect the amount or quality of thrombotic complications after varicose vein operation. If the DVT occurs, the evaluation of the D - dimer and careful clinical examination can be a useful method for its diagnosis. PMID:25292137

Warot, Marcin; Synowiec, Tomasz; Wencel-Warot, Agnieszka; Daroszewski, Przemys?aw; Bojar, Iwona; Micker, Maciej; Ch?ci?ski, Pawe?

2014-09-01

196

Percutaneous transhepatic portal vein stenting in a patient with benign non-transplant postoperative portal vein stenosis: A case report  

PubMed Central

Extrahepatic portal vein stenosis is caused by a variety of benign and malignant diseases and results in development of symptoms due to portal hypertension. Benign post-surgical adhesions causing portal vein stenosis in non-transplant population is an uncommon etiology of portal hypertension. Endovascular treatment of such patients with angioplasty and stenting is uncommonly reported in literature. We report a case of portal hypertension caused by benign postoperative portal vein fibrosis, successfully treated by self-expandable metallic stent. PMID:24604941

Madhusudhan, KS; Agrawal, Nikhil; Srivastava, Deep N; Pal, Sujoy; Gupta, Arun K

2013-01-01

197

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

198

Preventing intimal thickening of vein grafts in vein artery bypass using STAT-3 siRNA  

PubMed Central

Background Proliferation and migration of vascular smooth muscle cells (VSMCs) play a key role in neointimal formation which leads to restenosis of vein graft in venous bypass. STAT-3 is a transcription factor associated with cell proliferation. We hypothesized that silencing of STAT-3 by siRNA will inhibit proliferation of VSMCs and attenuate intimal thickening. Methods Rat VSMCs were isolated and cultured in vitro by applying tissue piece inoculation methods. VSMCs were transfected with STAT 3 siRNA using lipofectamine 2000. In vitro proliferation of VSMC was quantified by the MTT assay, while in vivo assessment was performed in a venous transplantation model. In vivo delivery of STAT-3 siRNA plasmid or scramble plasmid was performed by admixing with liposomes 2000 and transfected into the vein graft by bioprotein gel applied onto the adventitia. Rat jugular vein-carotid artery bypass was performed. On day 3 and7 after grafting, the vein grafts were extracted, and analyzed morphologically by haematoxylin eosin (H&E), and assessed by immunohistochemistry for expression of Ki-67 and proliferating cell nuclear antigen (PCNA). Western-blot and reverse transcriptase polymerase chain reaction (RT-PCR) were used to detect the protein and mRNA expression in vivo and in vitro. Cell apoptosis in vein grafts was detected by TUNEL assay. Results MTT assay shows that the proliferation of VSMCs in the STAT-3 siRNA treated group was inhibited. On day 7 after operation, a reduced number of Ki-67 and PCNA positive cells were observed in the neointima of the vein graft in the STAT-3 siRNA treated group as compared to the scramble control. The PCNA index in the control group (31.3 ± 4.7) was higher than that in the STAT-3 siRNA treated group (23.3 ± 2.8) (P < 0.05) on 7d. The neointima in the experimental group(0.45 ± 0.04 ?m) was thinner than that in the control group(0.86 ± 0.05 ?m) (P < 0.05).Compared with the control group, the protein and mRNA levels in the experimental group in vivo and in vitro decreased significantly. Down regulation of STAT-3 with siRNA resulted in a reduced expression of Bcl-2 and cyclin D1. However, apoptotic cells were not obviously found in all grafts on day 3 and 7 post surgery. Conclusions The STAT-3 siRNA can inhibit the proliferation of VSMCs in vivo and in vitro and attenuate neointimal formation. PMID:22216901

2012-01-01

199

Early results of a prospective randomized trial of spliced vein versus polytetrafluoroethylene graft with a distal vein cuff for limb-threatening ischemia  

Microsoft Academic Search

Objective: Single-piece vein remains the conduit of choice in patients who need bypass grafting for limb salvage. When this option is not available, two of the remaining options are prosthetic bypass graft or several segments of vein spliced together. In this study, we compare spliced vein bypass grafting versus polytetrafluoroethylene grafting with a distal vein cuff in patients with limb-threatening

Paul B. Kreienberg; R. Clement Darling; Benjamin B. Chang; Bradley J. Champagne; Philip S. K. Paty; Sean P. Roddy; William E. Lloyd; Kathleen J. Ozsvath; Dhiraj M. Shah

2002-01-01

200

Pulmonary Vein Stenosis After Catheter Ablation of Atrial Fibrillation  

Microsoft Academic Search

Background—This report describes the complication of pulmonary vein stenosis with resultant severe pulmonary hypertension that developed in 2 patients after successful catheter ablation of chronic atrial fibrillation. Methods and Results—Three months after successful catheter ablation of atrial fibrillation, both patients developed progressive dyspnea and pulmonary hypertension. Both were found to have severe stenosis of all 4 pulmonary veins near the

Ivan M. Robbins; Edward V. Colvin; Thomas P. Doyle; W. Evans Kemp; James E. Loyd; William S. McMahon; G. Neal Kay

201

Calcite veins in northeastern Puente Hills, southern California  

Microsoft Academic Search

Calcite vein fillings are locally exposed in the northeastern Puente Hills, 2 mi southwest of Pomona on the northeast margin of the Los Angeles basin. They occur within northeast- and northwest-trending faults in the middle Miocene Glendora Volcanics and in the Soquel Member of the upper Miocene Puente Formation. The veins range in width from 1 in. to 15 ft,

M. O. Spira; D. H. Zenger

1986-01-01

202

Splenic Vein Thrombosis and Gastrointestinal Bleeding in Chronic Pancreatitis  

Microsoft Academic Search

The most common cause of isolated thrombosis of the splenic vein is chronic pancreatitis caused by perivenous inflammation. Although splenic vein thrombosis (SVT) has been reported in up to 45% of patients with chronic pancreatitis, most patients with SVT remain asymptomatic. In those patients with gastrointestinal bleeding secondary to esophageal or gastric varices, the diagnostic test of choice to assess

Sharon M. Weber; Layton F. Rikkers

2003-01-01

203

[Crossectomy in ascending superficial thrombophlebitis of the leg veins].  

PubMed

Ascending thrombophlebitis of the superficial leg veins is known to propagate into the deep leg veins and to embolize. In a prospective study we followed up 44 patients with sonographically diagnosed ascending thrombophlebitis into the deep veins (V. saphena magna n = 40, V. saphena parva n = 4). In 15 of 44 cases (34%) thrombosis of the crossing veins was found intraoperatively and 6 of 44 crossings were filled with floating thrombi into the deep vein lumina (14%). Among complications of treatment (11.4%) recurrence of thrombi in the ligated superficial residual vein stump was seen in 2 of 44 cases. One of these patients suffered a symptomatic, non-fulminant pulmonary embolism. The other patient developed a femoral vein thrombosis. 1 patient had an abscess and 1 a seroma of the groin. In 11% of all cases ascending thrombophlebitis diagnosed duplex sonographically was not effective in preventing propagation of thrombi into the deep veins thromboembolism remains a complication of ascending thrombophlebitis. PMID:9454490

Kock, H J; Krause, U; Albrecht, K H; van der Laan, E; Rudofsky, G; Eigler, F W

1997-01-01

204

Tissue Fibrinolytic Activity in Different Types of Varicose Veins  

Microsoft Academic Search

The fibrinolytic activity of the venous wall was investigated by using Todd's technique 1 in 92 patients with different types of varicosis.A control group consisted of 19 patients with apparently normal superficial veins who had had a saphenectomy prior to an aortocoronary bypass operation. Fibrinolytic activity was mainly localized in the adventitia of varicose and nor mal veins. It significantly

Viola Hach; Monika Fink; Norbert Blees; Inge Scharrer

1986-01-01

205

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

206

Green Veining: Landscape Determinants of Biodiversity in European Agricultural Landscapes  

Microsoft Academic Search

Many semi-natural landscape elements, the so-called green veining, are disappearing from the intensively used agricultural landscapes of Europe. In order to develop or restore biodiversity in these networks, it is necessary to quantify the relation between biodiversity and amount, spatial arrangement and management intensity of green veining elements. In this review, we investigate whether biodiversity increases with the amount of

Carla J. Grashof-Bokdam; Frank van Langevelde

2005-01-01

207

Exercise-Induced Deep Vein Thrombosis of the Upper Extremity  

Microsoft Academic Search

Paget-Schroetter syndrome or effort-related upper extremity deep vein thrombosis is a rare condition that usually afflicts young healthy individuals, most commonly males. The cause is multifactorial but almost always involves extrinsic compression of the subclavian vein at the thoracic inlet, causing venous stenosis from repetitive trauma. The diagnosis of this condition may be difficult, and its delay may contribute to

Leonardo R. Brandão; Suzan Williams; Walter H. A. Kahr; Clodagh Ryan; Michael Temple; Anthony K.C. Chan

2006-01-01

208

Cellular repopulation of human vein allograft bypass grafts  

Microsoft Academic Search

Purpose: Vein allografts are an alternative conduit for patients lacking available autogenous vein. The ability to develop a neoendothelium is a potential advantage of allografts over other nonautogenous grafts, because endothelial cells have been shown to play numerous essential roles in vessel survival. However, repopulation by endothelial cells has not previously been demonstrated or characterized in human subjects. Methods: In

Todd R Johnson; John E Tomaszewski; Jeffrey P Carpenter

2000-01-01

209

Gender does not impact infrainguinal vein bypass graft outcome  

Microsoft Academic Search

Background: The percentage of women requiring infrainguinal bypass graft operations continues to increase, whereas the effect of gender on postoperative outcome remains unclear. The purpose of this study was to assess the influence of gender on patient selection and outcome in patients requiring infrainguinal vein bypass grafting procedures. Methods: This retrospective study reviewed 217 infrainguinal vein bypass grafts performed over

Spiros G Frangos; Suzanne Karimi; Morris D Kerstein; Mona Harpavat; Bauer Sumpio; Andrew B Roberts; Vivian Gahtan

2000-01-01

210

Relation between retinal vein occlusions and axial length  

Microsoft Academic Search

AIMS: To evaluate the ocular axial length as a risk factor for development of central retinal vein occlusion (CRVO) and branch retinal vein occlusion (BRVO). METHODS: Ocular axial lengths were measured, by A-scan ultrasonography, in 17 patients with CRVO and 41 patients with BRVO and compared with those of contralateral unaffected eyes and 66 age matched controls. RESULTS: In 17

N. Aritürk; Y. Oge; D. Erkan; Y. Süllü; F. Mohajerý

1996-01-01

211

Pseudoexfoliation and glaucoma in eyes with retinal vein occlusion  

Microsoft Academic Search

Purpose: To evaluate pseudoexfoliation (PE) and pre-existent glaucoma in eyes with branch retinal vein occlusion (BRVO) and central retinal vein occlusion (CRVO). Methods: Consecutive eyes with a diagnosis of BRVO (73 eyes of 70 patients) and CRVO (53 eyes of 49 patients) examined between July and December 1998 comprised the study eyes. Age-matched control group consisted of 384 eyes of

Osman A. Saatci; Sevgi Tongal Ferliel; Murat Ferliel; Süleyman Kaynak; Mehmet H. Ergin

1999-01-01

212

Plasma Homocysteine and Cysteine Levels in Retinal Vein Occlusion  

Microsoft Academic Search

PURPOSE. To determine plasma homocysteine and cysteine lev- els in patients with retinal vein occlusion (RVO) and in healthy subjects and to ascertain whether there are statistically signif- icant differences between patients and control subjects. METHODS. In this case- control study, the study group consisted of 75 consecutive patients with RVO: 33 had central retinal vein occlusion (CRVO), and 42

Antonio Pinna; Ciriaco Carru; Angelo Zinellu; Stefano Dore; Luca Deiana; Francesco Carta

2006-01-01

213

Cardiovascular and thrombophilic risk factors for central retinal vein occlusion  

Microsoft Academic Search

Retinal vein occlusion (RVO) is a relatively common disease that is often associated with a variety of systemic disorders including arterial hypertension, diabetes mellitus, dyslipidemia, and systemic vasculitis. There are various types of RVO, categorized on the basis of the site of occlusion and on the type of consequent vascular damage. Central retinal vein occlusion (CRVO) is the most frequently

Domenico Prisco; Rossella Marcucci; Laura Bertini; Anna Maria Gori

2002-01-01

214

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

215

Endoscopic versus traditional saphenous vein harvesting: a prospective, randomized trial  

Microsoft Academic Search

Background. Saphenous vein harvested with a traditional longitudinal technique often results in leg wound complications. An alternative endoscopic harvest technique may decrease these complications.Methods. One hundred twelve patients scheduled for elective coronary artery bypass grafting were prospectively randomized to have vein harvested using either an endoscopic (group A, n = 54) or traditional technique (group B, n = 58). Groups

Keith B Allen; Gary L Griffith; David A Heimansohn; Robert J Robison; Robert G Matheny; John J Schier; Edward B Fitzgerald; Carl J Shaar

1998-01-01

216

Deep Vein Thrombosis: Symptoms, Diagnosis, Treatment and Latest NIH Research | NIH MedlinePlus the Magazine  

MedlinePLUS

... Feature: Deep Vein Thrombosis Deep Vein Thrombosis: Symptoms, Diagnosis, Treatment and Latest NIH Research Past Issues / Spring ... pain Red or discolored skin on the leg Diagnosis Your doctor will diagnose deep vein thrombosis (DVT) ...

217

Computational Phlebology: The Simulation of a Vein Valve  

NASA Astrophysics Data System (ADS)

We present a three-dimensional computer simulation of the dynamics of a vein valve. In particular, we couple the solid mechanics of the vein wall and valve leaflets with the fluid dynamics of the blood flow in the valve. Our model captures the unidirectional nature of blood flow in vein valves; blood is allowed to flow proximally back to the heart, while retrograde blood flow is prohibited through the occlusion of the vein by the valve cusps. Furthermore, we investigate the dynamics of the valve opening area and the blood flow rate through the valve, gaining interesting insights into the physics of vein valve operation. It is anticipated that through computer simulations we can help raise our understanding of venous hemodynamics and various forms of venous dysfunction.

Buxton, Gavin; Clarke, Nigel

2007-03-01

218

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

219

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

220

Vein quality in infrainguinal revascularisation: assessment by angioscopy and histology.  

PubMed Central

The concept of vein quality has been slow to gain widespread acceptance, but an increasing body of evidence suggests that vein quality is relevant to the success of bypass grafting for peripheral vascular disease. The angioscope represents an additional tool for monitoring and preparing vein grafts during infrainguinal revascularisation. Within the overall theme of vein quality, this paper presents the cumulative experience with vascular endoscopy at Bristol Royal Infirmary. In clinical studies, the diagnostic role of angioscopy in quality control was evaluated by grafting preexisting, angioscopically detected, intraluminal abnormalities and correlating them with histological appearances. There were significant associations between angioscopy/histology grades and graft patency. To enable quantification of images, an innovative computerised video image processing method has been developed and validated against simultaneous ultrasound measurements of segments of saphenous vein. The therapeutic applications of angioscopy in vein graft preparation were studied prospectively in patients undergoing in situ femoropopliteal/distal bypasses by randomisation to full angioscopic or conventional preparation. There was a significant reduction in wound morbidity. Completion angioscopy and arteriography were complementary in the detection of technical defects. Harvested vein was maintained in organ culture to assess further the influence of pre-existing pathology and the potentially traumatic effects of angioscopy on development of neointimal hyperplasia. There was a significant correlation between the extent of pre-existing abnormality and smooth muscle cell proliferative activity in culture and although angioscopy caused endothelial cell loss, this did not stimulate neointimal hyperplasia in vitro. This work confirms that vein quality can be evaluated prospectively by angioscopy and that substandard vein is associated with inferior patency rates. Angioscopic and histological evaluation, together with vein organ culture studies, have definite application in helping to elucidate the mechanisms underlying graft failure. Images Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 8 PMID:9579121

Wilson, Y. G.

1998-01-01

221

Visual disturbance following sclerotherapy for varicose veins, reticular veins and telangiectasias: a systematic literature review.  

PubMed

The objective of the study was to review the literature reporting visual disturbance (VD) following sclerotherapy for varicose veins. Underlying mechanisms will be discussed. A literature search of the databases Medline and Google Scholar was performed. Original articles including randomized trials, case series and case reports reporting VD in humans following sclerotherapy for varicose veins were included. Additional references were also obtained if they had been referenced in related publications. The search yielded 4948 results of which 25 reports were found to meet the inclusion criteria. In larger series with at least 500 included patients the prevalence of VD following sclerotherapy ranges from 0.09% to 2%. In most reports foam sclerotherapy was associated with VD (19); exclusive use of liquid sclerosant was reported in two cases, some reports included foam and liquid sclerosant (4). There were no persistent visual disorders reported. VD occurred with polidocanol and sodium tetradecyl sulphate in different concentrations (0.25-3%). Various forms of foam preparation including various ways of foam production and the liquid - air ratio (1 or 2 parts of liquid mixed with 3, 4 or 5 parts of air) were reported in association with the occurrence of VD. VDs following sclerotherapy for varicose veins are rare and all reported events were transient. Bubble embolism or any kind of embolism seems unlikely to be the only underlying mechanism. A systemic inflammatory response following sclerotherapy has been suggested. Further research to clarify the mechanism of action of sclerosants is required. PMID:23202140

Willenberg, T; Smith, P C; Shepherd, A; Davies, A H

2012-11-30

222

Visual disturbance following sclerotherapy for varicose veins, reticular veins and telangiectasias: a systematic literature review.  

PubMed

The objective of the study was to review the literature reporting visual disturbance (VD)following sclerotherapy for varicose veins. Underlying mechanisms will be discussed. A literature search of the databases Medline and Google Scholar was performed. Original articles including randomized trials, case series and case reports reporting VD in humans following sclerotherapy for varicose veins were included. Additional references were also obtained if they had been referenced in related publications. The search yielded 4948 results of which 25 reports were found to meet the inclusion criteria. In larger series with at least 500 included patients the prevalence of VD following sclerotherapy ranges from 0.09% to 2%. In most reports foam sclerotherapy was associated with VD (19); exclusive use of liquid sclerosant was reported in two cases, some reports included foam and liquid sclerosant (4). There were no persistent visual disorders reported. VD occurred with polidocanol and sodium tetradecyl sulphate in different concentrations (0.25–3%). Various forms of foam preparation including various ways of foam production and the liquid –air ratio (1 or 2 parts of liquid mixed with 3, 4 or 5 parts of air) were reported in association with the occurrence of VD. VDs following sclerotherapy for varicose veins are rare and all reported events were transient. Bubble embolism or any kind of embolism seems unlikely to be the only underlying mechanism. A systemic inflammatory response following sclerotherapy has been suggested. Further research to clarify the mechanism of action of sclerosants is required. PMID:23761921

Willenberg, T; Smith, P C; Shepherd, A; Davies, A H

2013-04-01

223

Perivascular innate immune events modulate early murine vein graft adaptations  

PubMed Central

Objective Innate immunity drives numerous cardiovascular pathologies. Vein bypass grafting procedures are frequently accompanied by low-grade wound contamination. We hypothesized that a peri-graft innate immune challenge, via an outside-in route, augments inflammatory responses, which subsequently drive a component of negative vein graft wall adaptations; moreover, adipose tissue mediates this immune response. Methods The inferior vena cava from a donor mouse was implanted into the common carotid artery of a recipient mouse utilizing a validated cuff technique (9-week-old male C57BL/6J mice). Slow-release low-dose (5 ?g) lipopolysaccharide (LPS) (n = 9) or vehicle (n = 9) was applied peri-graft; morphologic analysis was completed (day 28). In parallel, vein-grafted mice received peri-graft LPS (n = 12), distant subcutaneous LPS (n = 6), or vehicle (n = 12), then day-1 and -3 harvest of grafts and adipose tissue for cytokines and toll-like receptor (TLR) signaling mRNA expression (qRT-PCR). Results All recipient mice survived, and all vein grafts were patent. Acute low-dose local LPS challenge enhanced vein graft lumen loss (P = .04) and tended to augment intimal hyperplasia (P = .06). The surgical trauma of vein grafting universally upregulated key pro- and anti-inflammatory mediators within the day-1 graft wall, but varied on TLR signaling gene expression. Local and distant LPS accentuated these patterns until at least postoperative day 3. LPS challenge enhanced the inflammatory response in adipose tissue (locally > distantly); local LPS upregulated adipose TLR-4 dramatically. Conclusions Perivascular and distant inflammatory challenges potentiate the magnitude and duration of inflammatory responses in the early vein graft wall, negatively modulating wall adaptations, and thus, potentially contribute to vein graft failure. Furthermore, surgery activates innate immunity in adipose tissue, which is augmented (regionally > systemically) by LPS. Modulation of these local and distant inflammatory signaling networks stands as a potential strategy to enhance the durability of vascular interventions such as vein grafts. (J Vasc Surg 2013;57:486-92.) Clinical Relevance Vein graft failure is traditionally considered as a process driven by luminal hemodynamic forces and endothelial injury. We report that the “outside-in” mechanism of local perivascular and distant inflammatory challenges potentiate the magnitude and duration of inflammatory responses in the early vein graft wall, negatively modulating wall adaptations, and thus potentially contribute to vein graft failure. Modulation of these inflammatory signaling networks (eg, extension of antibiotic administration beyond standard wound prophylaxis regimens) stands as a potential strategy to enhance the durability of vascular interventions such as vein grafts. PMID:23127978

Nguyen, Binh T.; Yu, Peng; Tao, Ming; Hao, Shuai; Jiang, Tianyu; Ozaki, C. Keith

2013-01-01

224

Influence of vein fabric on strain distribution and fold kinematics  

NASA Astrophysics Data System (ADS)

Abundant pre-folding, bedding-parallel fibrous dolomite veins in shale are found associated with the Nkana-Mindola stratiform Cu-Co deposit in the Central African Copperbelt, Zambia. These monomineralic veins extend for several meters along strike, with a fibrous infill orthogonal to low-tortuosity vein walls. Growth morphologies vary from antitaxial with a pronounced median surface to asymmetric syntaxial, always with small but quantifiable growth competition. Subsequently, these veins were folded. In this study, we aim to constrain the kinematic fold mechanism by which strain is accommodated in these veins, estimate paleorheology at time of deformation and investigate the influence of vein fabric on deformation during folding. Finally, the influence of the deformation on known metallogenetic stages is assessed. Various deformation styles are observed, ultimately related to vein attitude across tight to close lower-order, hectometre-scale folds. In fold hinges, at low to average dips, veins are (poly-)harmonically to disharmonically folded as parasitic folds in single or multilayer systems. With increasing distance from the fold hinge, parasitic fold amplitude decreases and asymmetry increases. At high dips in the limbs, low-displacement duplication thrusts of veins at low angles to bedding are abundant. Slickenfibres and slickenlines are sub-perpendicular to fold hinges and shallow-dipping slickenfibre-step lineations are parallel to local fold hinge lines. A dip isogon analysis of reconstructed fold geometries prior to homogeneous shortening reveals type 1B parallel folds for the veins and type 1C for the matrix. Two main deformation mechanisms are identified in folded veins. Firstly, undulatory extinction, subgrains and fluid inclusions planes parallel the fibre long axis, with deformation intensity increasing away from the fold hinges, indicate intracrystalline strain accumulation. Secondly, intergranular deformation through bookshelf rotation of fibres, via collective parallel rotation of fibres and shearing along fibre grain boundaries, is clearly observed under cathodoluminescence. We analysed the internal strain distribution by quantifying simple shear strain caused by deflection of the initially orthogonal fibres relative to layer inclination at a given position across the fold. Shear angle, and thus shear strain, steadily increases towards the limbs away from the fold hinge. Comparison of observed shear strain to theoretical distribution for kinematic mechanisms, amongst other lines of evidence, clearly points to pure flexural flow followed by homogeneous shortening. As flexural flow is not the expected kinematic folding mechanism for competent layers in an incompetent shale matrix, our analysis shows that the internal vein fabric in these dolomite veins can exhibit a first-order influence on folding mechanisms. In addition, quantitative analysis shows that these veins acted as rigid objects with high viscosity contrast relative to the incompetent carbonaceous shale, rather than as semi-passive markers. Later folding-related syn-orogenic veins, intensely mineralised with Cu-Co sulphides, are strongly related to deformation of these pre-folding veins. The high viscosity contrast created by the pre-folding fibrous dolomite veins was therefore essential in creating transient permeability for subsequent mineralising stages in the veining history.

Torremans, Koen; Muchez, Philippe; Sintubin, Manuel

2014-05-01

225

Angiosperm leaf vein evolution was physiologically and environmentally transformative  

PubMed Central

The veins that irrigate leaves during photosynthesis are demonstrated to be strikingly more abundant in flowering plants than in any other vascular plant lineage. Angiosperm vein densities average 8?mm of vein per mm2 of leaf area and can reach 25?mm?mm?2, whereas such high densities are absent from all other plants, living or extinct. Leaves of non-angiosperms have consistently averaged close to 2?mm?mm?2 throughout 380 million years of evolution despite a complex history that has involved four or more independent origins of laminate leaves with many veins and dramatic changes in climate and atmospheric composition. We further demonstrate that the high leaf vein densities unique to the angiosperms enable unparalleled transpiration rates, extending previous work indicating a strong correlation between vein density and assimilation rates. Because vein density is directly measurable in fossils, these correlations provide new access to the physiology of extinct plants and how they may have impacted their environments. First, the high assimilation rates currently confined to the angiosperms among living plants are likely to have been unique throughout evolutionary history. Second, the transpiration-driven recycling of water that is important for bolstering precipitation in modern tropical rainforests might have been significantly less in a world before the angiosperms. PMID:19324775

Boyce, C. Kevin; Brodribb, Tim J.; Feild, Taylor S.; Zwieniecki, Maciej A.

2009-01-01

226

Palm vein verification using multiple features and locality preserving projections.  

PubMed

Biometrics is defined as identifying people by their physiological characteristic, such as iris pattern, fingerprint, and face, or by some aspects of their behavior, such as voice, signature, and gesture. Considerable attention has been drawn on these issues during the last several decades. And many biometric systems for commercial applications have been successfully developed. Recently, the vein pattern biometric becomes increasingly attractive for its uniqueness, stability, and noninvasiveness. A vein pattern is the physical distribution structure of the blood vessels underneath a person's skin. The palm vein pattern is very ganglion and it shows a huge number of vessels. The attitude of the palm vein vessels stays in the same location for the whole life and its pattern is definitely unique. In our work, the matching filter method is proposed for the palm vein image enhancement. New palm vein features extraction methods, global feature extracted based on wavelet coefficients and locality preserving projections (WLPP), and local feature based on local binary pattern variance and locality preserving projections (LBPV_LPP) have been proposed. Finally, the nearest neighbour matching method has been proposed that verified the test palm vein images. The experimental result shows that the EER to the proposed method is 0.1378%. PMID:24693230

Al-Juboori, Ali Mohsin; Bu, Wei; Wu, Xiangqian; Zhao, Qiushi

2014-01-01

227

Common facial vein: an alternative patch material in carotid angioplasty.  

PubMed

Patch angioplasty is a popular adjunct to carotid endarterectomy to facilitate arteriotomy closure. The long saphenous vein is the common autogenous patch in use. We tested the feasibility of using the ipsilateral common facial vein (CFV), which is usually sacrificed during exposure of the carotid bifurcation. A consecutive series of 17 patients undergoing carotid endarterectomy was examined to show the use of CFV patch in arteriotomy closure in 18 procedures. During exposure of the carotid bifurcation, the facial vein was harvested and distended with heparinized saline to assess the size of the vein. If the vein had an adequate diameter, it was everted and used as a double-layered patch. Patients were followed up postoperatively with serial duplex scanning at 3, 6 and 12 months, and yearly thereafter. The median (range) age of the patients in the series was 66 years (52-72 years). Of the 18 CFV harvested, 2 were rejected because of small calibre. The median (range) length of the vein harvested was 5 cm (4-6 cm). The average diameter of harvested vein was 5 mm. The median (range) time taken for harvesting, distending and everting the vein was 10 min (8-12 min). There were no perioperative deaths or strokes. There was no significant re-stenosis during the follow up of 24 months (18-36 months), with a mean peak velocity of 0.86 m/s (0.58-1.29 ). The use of everted CFV patch in carotid angioplasty is safe, quick, convenient and durable, whereas saphenous veins are spared and lower limb incisions avoided. PMID:18269485

Abeysekara, Abeywardana M S; Siriwardana, H P Priyantha; Prabaharan, Balasingham; Tiwari, Alok; Madipolagedara, Nissanka; Jacob, Sabu

2008-03-01

228

Portal Vein Aneurysms: A Case Series with Literature Review  

PubMed Central

Portal vein aneurysms are a relatively uncommon entity and often an incidental, asymptomatic finding. Recognition of this finding can help to avoid potential confusion with abdominal masses of other etiologies. We would like to present four cases of portal vein aneurysms, and discuss the natural history, imaging findings, and treatment of this condition. One of the cases of portal vein aneurysm presented occurred after liver transplantation, which, to the best of our knowledge, has only been described once in the English-language literature. PMID:22470738

Schwope, Ryan B.; Margolis, Daniel J.; Raman, Steven S.; Kadell, Barbara M.

2010-01-01

229

Varicose veins: optimum compression after surgery and sclerotherapy.  

PubMed Central

Graduated compression stockings are used in both surgical and non-surgical treatment of varicose veins. In a trial of high versus low compression stockings (40 mmHg vs 15 mmHg at ankle) after varicose vein surgery, both were equally effective in controlling bruising and thrombophlebitis, but low compression stockings proved to be more comfortable. In a further trial after sclerotherapy, high compression stockings alone produced comparable results to Elastocrepe bandages with stockings. It is concluded that after varicose vein surgery low compression stockings provide adequate support for the leg and that after sclerotherapy, bandaging is not required if a high compression stocking is used. PMID:2690721

Shouler, P. J.; Runchman, P. C.

1989-01-01

230

Total Anomalous Pulmonary Venous Connection to the Portal Vein  

SciTech Connect

Anomalous pulmonary venous return represents a rare congenital anomaly with wide anatomic and physiologic variability. We report a case of a newborn with a rare form of total infracardiac anomalous pulmonary venous connection (TAPVC). The pulmonary veins draining both lungs formed two vertical veins, which joined to a common pulmonary trunk below the diaphragm. This venous channel connected to the portal vein through the esophageal hiatus. The diagnosis was suggested by color Doppler sonography and confirmed by intravenous digital subtraction angiography, which allowed definition of the anatomy.

Wyttenbach, Marina [Department of Diagnostic Radiology, Division of Children's Radiology, University Hospital, Inselspital, CH-3010 Bern (Switzerland); Carrel, Thierry; Schuepbach, Peter [Department of Thoracic and Cardiovascular Surgery, University Hospital, Inselspital, CH-3010 Bern (Switzerland); Tschaeppeler, Heinz; Triller, Juergen [Department of Diagnostic Radiology, Division of Children's Radiology, University Hospital, Inselspital, CH-3010 Bern (Switzerland)

1996-03-15

231

Pylephlebitis of a variant mesenteric vein complicating sigmoid diverticulitis  

PubMed Central

Pylephlebitis - suppurative thrombophlebitis of the portal and/or mesenteric veins - is a rare complication of abdominal infections, especially diverticulitis. It can lead to severe complications such as hepatic abscess, sepsis, peritonitis, bowel ischemia, etc., which increase the mortality rate. Here we present a case of suppurative thrombophlebitis of the inferior mesenteric vein, as a complication of sigmoid diverticulitis. The epidemiology, clinical and radiological features as well as treatment strategies are discussed. We also review the anatomy of the mesenteric vein given its anatomic variation in the present case and how this anatomic knowledge might influence the operative approach should surgery be necessary. PMID:24967018

Falkowski, Anna L.; Cathomas, Gieri; Zerz, Andreas; Rasch, Helmut; Tarr, Philip E.

2014-01-01

232

Duodenal obstruction due to a preduodenal portal vein.  

PubMed

An infant presented with clinical signs and symptoms suggestive of a pyloric stenosis. On abdominal ultrasound, pyloric stenosis was excluded, and other causes for proximal duodenal obstruction, such as a duodenal web or annular pancreas, were suspected. At surgery, the cause was found to be due to an anterior portal vein or preduodenal portal vein, compressing the duodenum. There were no associated findings such as midgut malrotation, duodenal web and congenital anomalies. The treatment was a diamond-shaped duodeno-duodenostomy anterior to the portal vein. The patient improved after surgery. PMID:25323190

Vilakazi, Mnc; Ismail, F; Swanepoel, H M; Muller, E W; Lockhat, Z I

2014-01-01

233

[Vasa vasorum of subcutaneous veins and lymph vessels].  

PubMed

After intraarterial ink-injection the vasa vasorum of veins and lymphatic vessels in adults, dead born children and fetuses were demonstrated micropreparatorily. In their walls the larger veins of the saphena system possess a capillary network corresponding to the connective tissue and muscle structures/patterns in the vessel wall. No vasa vasorum could be found in the subcutaneous veins less than 1 mm in diameter. The lymphatic vessels of the inner prefascial bundle show a one-dimensional capillary network in the outer layers of the wall. Like the vasa vasorum of the saphena system it develops in the second half of fetal life. PMID:2238819

Schäfer, K

1990-01-01

234

[Acute thrombophlebitis in the territory of saphena magna vein].  

PubMed

Problems of strategy and policy of surgical treatment of acute thrombophlebitis in the territory of saphena magna vein are discussed. Results of urgent radical combined venectomy in 76 patients are presented. A gas technique of subfascial dissection of perforant veins (SEPS) was used in 52 patients for the first time both for diagnosis and adequate treatment of thrombosed perforants. Spread of thrombosis from superficial veins to perforants was revealed in 14.3% patients with C3-C5 class of venous dysfunction (CEAP classification). Isolated and local forms of crus varicothrombophlebitis that must be urgently operated are distinguished. The mean hospital stay was 8.7 bed-days. PMID:15111959

Beburishvili, A G; Shatalov, A V; Shatalov, A A

2004-01-01

235

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

236

Deep vein thrombosis following laparoscopic hysterectomy in a nulliparous woman.  

PubMed

A nulliparous woman aged 45 years was referred to us with painful swelling in left lower limb. She underwent laparoscopic hysterectomy for menorrhagia 12 days prior to the admission. The laparoscopic surgery was completed in 90 min without blood loss and blood transfusion. The size of the uterus was approximately 12 weeks. Duplex scan of the left lower limb confirmed thrombosis of the left external iliac vein, femoral vein, popliteal vein and tibial veins. On examination the laparoscopic puncture wounds healed well. She was hospitalized for initial anticoagulation with low molecular weight heparin (Enoxapain 1 mg/kg body weight twice daily) and compression bandages. Histological examination of the hysterectomy specimen was noted to be benign (Adenomyosis and cervical Leiomyoma). She responded to anticoagulation therapy and was discharged with an advice to attend the follow up clinic for long term anticoagulation advice for the next 6 months to prevent recurrent thromboembolic episodes. PMID:22851832

Pinjala, Ramakrishna; Lankala, Ramachandra Reddy; Pulipati, V N L S Vani

2011-08-01

237

Extracorporeal shock waves as curative therapy for varicose veins?  

PubMed

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

238

Technical options in reconstruction of large mediastinal veins.  

PubMed

Twelve patients who underwent graft replacement of the large mediastinal veins were reviewed. A preoperative superior vena caval (SVC) syndrome was present in seven patients. The most frequent diagnosis was a primary thoracic malignant neoplasm (10 patients). Reconstruction was performed with a pericardial tube in four patients, venae saphena magna in three patients, umbilical vein in three patients, and Dacron grafts in two patients. A temporary bypass was used in three patients. All the patients survived the operation. Eight patients died within 15 months of the surgery. Four patients are long-term survivors without signs of an SVC syndrome. Based on our experience and a review of the literature, we recommend the use of two autogenous vein grafts or a ringed polytetrafluoroethylene graft with a diameter of about one half that of the normal SVC to replace the large mediastinal veins. PMID:1542856

Larsson, S; Lepore, V

1992-03-01

239

CT of superior mesenteric vein thrombosis complicating periappendiceal abscess.  

PubMed

Acute mesenteric vein thrombosis is a rare complication of appendicitis. In this report we describe the clinical association of these entities and emphasize how early diagnosis by CT can expedite treatment. PMID:8454761

Yu, J S; Bennett, W F; Bova, J G

1993-01-01

240

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

241

The persistent embryonic vein in Klippel-Trenaunay syndrome.  

PubMed

Klippel-Trenaunay syndrome (KTS) is a congenital malformation syndrome with prominent vascular anomalies. A persistent embryonic vein (PEV) may be located on the affected leg(s) of patients with KTS. Our understanding of PEVs of the legs is limited and their nomenclature is confusing. The objective of this study was to obtain further insight in the prevalence, nomenclature and etiology of PEVs of the legs in KTS and to propose a standardized description of anomalous leg veins in KTS. We investigated 70 KTS patients for the presence of PEVs (lateral marginal vein, LMV) of the legs by duplex ultrasonography. We performed histopathological analysis of a surgically excised PEV (LMV) of a typical KTS patient, and we conducted an extensive literature study. Duplex ultrasonography showed LMVs in 12/70 (17.1%) patients. The terms used to describe PEVs in the leg are quite variable, while indicating only two types: lateral marginal vein (LMV) and persistent sciatic vein (PSV). The histology of the excised LMV showed remarkable similarity with that of varicose veins found in the general population. In conclusion, the prevalence of LMVs in our KTS cohort is 17.1%. Two PEVs can be found in the legs and we propose nomenclature based on anatomical criteria, thereby using only the terms persistent lateral marginal vein and persistent sciatic vein, combined with the patency of the deep venous system. We hypothesize that PEVs are most likely caused by a genetic defect leading to abnormal venous pattern formation, which is further supported by our histopathological findings. PMID:23966121

Oduber, Charlène E U; Young-Afat, Danny A; van der Wal, Allard C; van Steensel, Maurice A M; Hennekam, Raoul C M; van der Horst, Chantal M A M

2013-08-01

242

Altered Liver Morphology After Portal Vein Thrombosis: Not Always Cirrhosis  

Microsoft Academic Search

The macroscopic appearance of the liver after primary portal vein thrombosis often mimics cirrhosis, despite the absence of\\u000a bridging fibrosis at histology. The purpose of this study was to describe unique morphologic changes of the liver after portal\\u000a venous thrombosis. A retrospective review was performed to find patients with portal vein thrombosis and a corresponding noncirrhotic\\u000a liver biopsy. The CT

Mitchell E. Tublin; Alexander J. Towbin; Michael P. Federle; Michael A. Nalesnik

2008-01-01

243

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

244

Hypercoagulable States in Primary Upper-Extremity Deep Vein Thrombosis  

Microsoft Academic Search

Background: There are very few data on the preva- lence of coagulation abnormalities in primary deep vein thrombosis of the upper limbs. Objective: To determine if coagulation abnormalities play a role in effort-related and\\/or idiopathic (non-effort- related) upper-extremity deep vein thrombosis (UEDVT). Methods: Fifty-one consecutive patients (21 men and 30 women) who had effort-related (n = 20) or idiopathic (n

Emmanuel Heron; Olivier Lozinguez; Martine Alhenc-Gelas; Joseph Emmerich; Jean-Noel Fiessinger

2000-01-01

245

Hyperhomocysteinemia: a risk factor for central retinal vein occlusion  

Microsoft Academic Search

PURPOSE:Previous studies have documented that elevated plasma homocysteine level is a risk factor for vascular disease. This study was performed to determine whether hyperhomocysteinemia is a risk factor for central retinal vein occlusion.METHODS:In a case-control study, data from 74 patients with documented central retinal vein occlusion were reassessed. Control subjects consisted of individuals referred to the same clinic for assessment

Andrew K Vine

2000-01-01

246

Calcite veins in northeastern Puente Hills, southern California  

SciTech Connect

Calcite vein fillings are locally exposed in the northeastern Puente Hills, 2 mi southwest of Pomona on the northeast margin of the Los Angeles basin. They occur within northeast- and northwest-trending faults in the middle Miocene Glendora Volcanics and in the Soquel Member of the upper Miocene Puente Formation. The veins range in width from 1 in. to 15 ft, and several can be traced hundreds of feet. The veins exhibit complex banded and brecciated textures and emit a strong hydrocarbon odor when broken. The carbon isotopic composition is light (delta/sup 13/C = -22.1 to -45.6 per thousand PDB). The range of the oxygen isotopic composition (delta/sup 18/O = +21.3 to +31.1 per thousand SMOW) generally compares with those reported for diagenetic carbonates in marine Miocene shales of California and Oregon. Dissolution of unusual local Soquel marine carbonates, now primarily dolomite, and diagenetic cements seems to be the most likely source of the calcite that was deposited incrementally along faults to form the calcite-filled veins. The extremely depleted carbon isotope values represent the addition of carbon derived from the chemical and/or biological oxidation of methane; a petroleum source of the methane is suggested by the presence of solid hydrocarbon inclusions in the vein calcite. The formation temperature of the vein calcite was probably below hydrothermal.

Spira, M.O.; Zenger, D.H.

1986-04-01

247

Vein graft adaptation and fistula maturation in the arterial environment.  

PubMed

Veins are exposed to the arterial environment during two common surgical procedures, creation of vein grafts and arteriovenous fistulae (AVF). In both cases, veins adapt to the arterial environment that is characterized by different hemodynamic conditions and increased oxygen tension compared with the venous environment. Successful venous adaptation to the arterial environment is critical for long-term success of the vein graft or AVF and, in both cases, is generally characterized by venous dilation and wall thickening. However, AVF are exposed to a high flow, high shear stress, low-pressure arterial environment and adapt mainly via outward dilation with less intimal thickening. Vein grafts are exposed to a moderate flow, moderate shear stress, high-pressure arterial environment and adapt mainly via increased wall thickening with less outward dilation. We review the data that describe these differences, as well as the underlying molecular mechanisms that mediate these processes. Despite extensive research, there are few differences in the molecular pathways that regulate cell proliferation and migration or matrix synthesis, secretion, or degradation currently identified between vein graft adaptation and AVF maturation that account for the different types of venous adaptation to arterial environments. PMID:24582063

Lu, Daniel Y; Chen, Elizabeth Y; Wong, Daniel J; Yamamoto, Kota; Protack, Clinton D; Williams, Willis T; Assi, Roland; Hall, Michael R; Sadaghianloo, Nirvana; Dardik, Alan

2014-05-01

248

Intimal proliferation in an organ culture of human saphenous vein.  

PubMed Central

This study investigated whether intimal proliferation, the characteristic feature of the response of human saphenous vein to arterial implantation, also occurs in organ culture. Vein segments were maintained for 14 days in medium supplemented with 30% fetal bovine serum. Tissue viability (measured by adenosine triphosphate [ATP] concentration) decreased only 20% from 280 +/- 20 to 220 +/- 20 nmol/g wet weight. In veins prepared for culturing, endothelial loss (approximately 20%) was confined to near the cut edges. Cultured veins retained an endothelial layer in the initially undamaged areas, while the initially injured areas became covered by a mixture of endothelial and vascular smooth muscle cells. Autoradiography in conjunction with scanning electron microscopy showed the presence of proliferating cells on the intimal surface. Transverse sections of cultured veins showed the development of a new intima containing vascular smooth muscle cells identified by immunocytochemistry with anti-alpha-actin. There were also endothelial cells identified with Ulex europaeus lectin arranged in capillarylike structures. Pulse or continuous labeling of cultures with [3H]thymidine showed that proliferating cells were confined to the new intima and suggested that the smooth muscle cells in this layer arose from both immigration and proliferation. The results demonstrate that intimal proliferation occurs in organ culture of human saphenous veins. Images Figure 1 Figure 2 Figure 3 PMID:2260628

Soyombo, A. A.; Angelini, G. D.; Bryan, A. J.; Jasani, B.; Newby, A. C.

1990-01-01

249

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

250

Morphological changes in rabbit's veins following laser therapy  

NASA Astrophysics Data System (ADS)

The authors present the results of recorded changes in the endothelium in rabbit's veins following photocoagulation by laser diode. In our study we concentrate mainly on the detailed description of individual changes in the rabbit's venous system in the area of the pelvis following laser therapy. The aim of our experiments was to reach the obliteration of rabbits' v. saphena lateralis using 980 nm laser diode with 200 micron fibre. The intensity of discharge was 3,5,6 and 7 watts. We examined the relationship between changes and the amount of joules that affect the endothelium of the rabbit's veins. The operation was conducted under general anaesthetic. All the animals survived treatment and were returned to breeders. Within the time span of one, three, six and eight weeks the laser treated veins were removed. They were fixated in formaldehyde and sent for microscopic examination. We were interested in how long it will take for fibrous changes to occur in the endothelium of the vein and thus also the subsequent occlusion of the vein depending on the amount of joules applied per one centimetre of the vein.

Veverkov, L.; Kala?, J.; ?apov, I.; Wechsler, J.; Pá?, L.; Svíženska, I.; Pitr, V.

2005-11-01

251

Traumatic Disruption of Saphenous Vein Graft Bypassed to the Dorsalis Pedis Artery  

PubMed Central

We describe a rare case of traumatic disruption of saphenous vein graft bypassed to the dorsalis pedis artery. The vein graft was disrupted at the level of ankle joint by blunt trauma and symptoms of acute foot ischemia were recognized. The injured vein graft was reconstructed with cephalic vein graft interposition. He has been free from any events of foot ischemia at 10 months follow-up with patent vein graft to the dorsalis pedis artery. PMID:25298838

Kitano, Ikuro; Tsuji, Yoriko; Sawada, Katsuhiro

2014-01-01

252

Management of macular edema secondary to central retinal vein occlusion: an evidence-based  

Microsoft Academic Search

Retinal vein occlusions are common retinal vascular disorders with the potential for significant vision-related morbidity.\\u000a Retinal vein occlusions are classified as either branch retinal vein occlusion (BRVO), central retinal vein occlusion (CRVO),\\u000a or hemiretinal vein occlusion (HRVO) based on the specific occlusion site. Decreased vision in patients afflicted with CRVO\\u000a may result from retinal ischemia and\\/or the accumulation of fluid

Ahmad A. Aref; Ingrid U. Scott

2011-01-01

253

Atherogenic effect of barotrauma on in situ saphenous veins in monkeys.  

PubMed

The objectives of this study were to determine whether veins subjected to barotrauma in situ undergo lipid uptake and morphologic changes to the same extent as veins grafted into the arterial circulation. Saphenous veins in seven stump-tailed macaque monkeys were exposed bilaterally and were circumferentially dissected free from surrounding tissue only at isolated sites. Segments of the veins were distended for 1 minute at hydrostatic pressures of 125 or 350 mm Hg. An undistended segment served as control. A cephalic vein graft was interposed in the femoral artery for comparison with in situ veins. The animals were fed a diet that sustains plasma cholesterol levels of approximately 225 mg/dl. Saphenous veins and the cephalic vein grafts were explanted at 3 months for biochemical and histologic analyses. Cholesterol content in undistended saphenous veins was similar to that in veins distended at 125 or 350 mm Hg--105 +/- 15, 122 +/- 14, and 109 +/- 30 micrograms/100 mg wet tissue weight, respectively. Cholesterol content in cephalic vein grafts, 473 +/- 122 micrograms/100 mg, was greater (p less than 0.001) than in saphenous veins at all distention pressures studied. There was no difference among the distention pressures in the intimal fraction of saphenous vein wall, with the pooled value being 20% +/- 12%. This contrasted with the value of 59% +/- 11% in cephalic vein grafts (p less than 0.01). Endothelial coverage of the luminal surface in saphenous veins was similar among the levels of barotrauma, with the pooled value being 83% +/- 15%. Less of the lumen was covered with endothelium in cephalic vein grafts, 46% +/- 18% (p less than 0.01). Slightly more medial fibrosis was observed in cephalic vein grafts as compared with saphenous veins (p less than 0.05). These data demonstrate that barotrauma alone does not cause veins that remain in the venous system to undergo the lipid uptake or morphologic changes that occur in veins grafted into the arterial circulation in nonhuman primates. PMID:1881183

Boerboom, L E; Olinger, G N; Rodriguez, E R; Ferrans, V J; Kissebah, A H

1991-09-01

254

[Medicamentous protection of lower limb veins in a subacute period of varicophlebitis of the great saphenous vein].  

PubMed

The study was aimed at determining the dynamics of saphenous veins in patients with varicophlebitis of the great saphenous vein (GSV) in a subacute period (during compression therapy) and at assessing efficacy of 4-month medicamentous protection thereof. We examined a total of 32 patients presenting with the first episode of non-embolic varicophlebitis of the great saphenous vein. The comparison group comprised 16 patients undergoing 4-month compression (degree 2) therapy alone, and the study group patients (n = 16) were subjected to compression therapy combined with a 4-month course of micronized diosmin (1 tablet twice a day). The patients were included into the groups alternately as they attended our medical facility. Duplex scanning before and after the treatment course was used to measure the following parameters: 1) the evening diameter of veins and 2) an increase in the vein's diameter measured overnight as compared to the morning measures - the orthostatic gradient. The obtained results showed that the subacute period of varicophlebitis of the GSV is accompanied and followed by an increase in the diameter of the GSV and SSV and that of their orthostatic gradient, caused by imparted tonicity and viscoelastic properties. Compression therapy alone in the subacute period of varicophlebitis does not provide complete safety of saphenous veins from secondary lesions. Compression therapy combined with a 4-month-long course of taking micronized diosmin increases the efficacy of treatment. PMID:23324634

Tsukanov, Iu T; Tsukanov, A Iu; Nikola?chuk, A I

2012-01-01

255

Dual Balloon-Occluded Retrograde Transvenous Obliteration of Gastric Varix Draining into the Left Adrenal Vein and Left Inferior Phrenic Vein  

SciTech Connect

A 66-year-old woman with a gastric varix, draining into a dilated left adrenal vein and a left inferior phrenic vein, was treated with dual balloon-occluded retrograde transvenous obliteration (B-RTO). Under balloon occlusion of the left adrenal vein and the left inferior phrenic vein, retrograde injection of a sclerosant (5% ethanolamine oleate) into the gastric varix was performed. Two weeks later, disappearance of flow in the gastric varix was confirmed on endoscopic ultrasound examination.

Nishida, Norifumi, E-mail: norifumin@med.osaka-cu.ac.jp; Ninoi, Teruhisa; Kitayama, Toshiaki; Yamamoto, Akira; Sakai, Yukimasa; Sato, Kimihiko; Hamuro, Masao; Nakamura, Kenji; Inoue, Yuichi; Yamada, Ryusaku [Osaka City University Medical School 1-4-3, Asahi-machi, Department of Radiology (Japan)

2004-09-15

256

Transradial Approach for Transcatheter Selective Superior Mesenteric Artery Urokinase Infusion Therapy in Patients with Acute Extensive Portal and Superior Mesenteric Vein Thrombosis  

SciTech Connect

The purpose of this investigation was to assess the feasibility and effectiveness of transradial approach for transcatheter superior mesenteric artery (SMA) urokinase infusion therapy in patients with acute extensive portal and superior mesenteric venous thrombosis. During a period of 7 years, 16 patients with acute extensive thrombosis of the portal (PV) and superior mesenteric veins (SMV) were treated by transcatheter selective SMA urokinase infusion therapy by way of the radial artery. The mean age of the patients was 39.5 years. Through the radial sheath, a 5F Cobra catheter was inserted into the SMA, and continuous infusion of urokinase was performed for 5-11 days (7.1 {+-} 2.5 days). Adequate anticoagulation was given during treatment, throughout hospitalization, and after discharge. Technical success was achieved in all 16 patients. Substantial clinical improvement was seen in these 16 patients after the procedure. Minor complications at the radial puncture site were observed in 5 patients, but trans-SMA infusion therapy was not interrupted. Follow-up computed tomography scan before discharge demonstrated nearly complete disappearance of PV-SMV thrombosis in 9 patients and partial recanalization of PV-SMV thrombosis in 7 patients. The 16 patients were discharged 9-19 days (12 {+-} 6.0 days) after admission. Mean duration of follow-up after hospital discharge was 44 {+-} 18.5 months, and no recurrent episodes of PV-SMV thrombosis developed during that time period. Transradial approach for transcatheter selective SMA urokinase infusion therapy in addition to anticoagulation is a safe and effective therapy for the management of patients with acute extensive PV-SMV thrombosis.

Wang Maoqiang, E-mail: wangmq@vip.sina.com; Guo Liping; Lin Hanying; Liu Fengyong; Duan Feng; Wang Zhijun [Chinese PLA General Hospital, Department of Interventional Radiology (China)

2010-02-15

257

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

258

Mouse Vein Graft Hemodynamic Manipulations to Enhance Experimental Utility  

PubMed Central

Mouse models serve as a tool to study vein graft failure. However, in wild-type mice, there is limited intimal hyperplasia, hampering efforts to identify anti–intimal hyperplasia therapies. Furthermore, vein graft wall remodeling has not been well quantified in mice. We hypothesized that simple hemodynamic manipulations can reproducibly augment intimal hyperplasia and remodeling end points in mouse vein grafts, thereby enhancing their experimental utility. Mouse inferior vena cava–to-carotid interposition isografts were completed using an anastomotic cuff technique. Three flow restriction manipulations were executed by ligating outflow carotid branches, creating an outflow common carotid stenosis, and constructing a midgraft stenosis. Flowmetry and ultrasonography were used perioperatively and at day 28. All ligation strategies decreased the graft flow rate and wall shear stress. Morphometry showed that intimal thickness increased by 26% via carotid branch ligation and by 80% via common carotid stenosis. Despite similar mean flow rates and shear stresses among the three manipulations, the flow waveform amplitudes were lowest with common carotid stenosis. The disordered flow of the midgraft stenosis yielded poststenotic dilatation. The creation of an outflow common carotid stenosis generates clinically relevant (poor runoff) vein graft low wall shear stress and offers a technically flexible method for enhancing the intimal hyperplasia response. Midgraft stenosis exhibits poststenotic positive wall remodeling. These reproducible approaches offer novel strategies for increasing the utility of mouse vein graft models. PMID:21641408

Yu, Peng; Nguyen, Binh T.; Tao, Ming; Bai, Yingnan; Ozaki, C. Keith

2011-01-01

259

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

260

Finger vein recognition based on personalized weight maps.  

PubMed

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

261

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

262

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

263

Portal vein thrombosis with renal cell carcinoma: a case report.  

PubMed

Portal vein thrombosis refers to an obstruction of blood flow in the portal vein; this rare disease can be both local and systemic. Local risk factors, accounting for about 70% of cases, can be abdominal cancers, inflammatory of infective diseases, surgical procedures or cirrhosis. A 62-year-old man, affected by hypertension and taking acetylsalicylic acid after a myocardial infarction in 1994, developed deep venous thrombosis on the right leg. Six months later the patient was admitted to the emergency unit due to abdominal pain. A CT scan revealed the presence of a complete splanchnic vein thrombosis and a primary tumor on the right kidney. The patient was treated with total parenteral nutrition and intravenous solution of heparin sodium first and then, because of occurrence of allergy, fondaparinux, with improvement of the abdominal pain. Subsequently he underwent right radical nephrectomy. PMID:23796464

D'Elia, Carolina; Cerruto, Maria Angela; Molinari, Alberto; Piovesan, Raffaella; Cavicchioli, Francesca; Minja, Anila; Novella, Giovanni; Artibani, Walter

2014-01-01

264

[Deep vein thrombosis revealing myeloproliferative syndrome in two adolescents].  

PubMed

Deep vein thrombosis occurs in 30% of patients with essential thrombocythemia, but rarely at initial diagnosis. We report two pediatric patients with essential thrombocythemia revealed by atypical deep vein thrombosis. First, a 16-year-old girl presented Budd-Chiari syndrome revealed by a hemorrhagic shock. Clinical exam revealed isolated splenomegaly. A search for thrombophilia found a factor V Leiden homozygous mutation and a Jak2 mutation. Bone marrow biopsy confirmed the diagnosis of a myeloproliferative disorder. The second case, a 17-year-old girl, had a routine examination by her physician that revealed splenomegaly. Ultrasonography displayed thrombus in the splenic and portal vein. An isolated Jak2 mutation was found and a myeloproliferative disorder was confirmed by bone marrow biopsy. The diagnosis of myeloproliferative disorder was made in both patients presenting atypical venous thrombosis with a Jak2 mutation and confirmed by bone marrow biopsy. These initial presentations of myeloproliferative disorders are rare in childhood and possibly underdiagnosed. PMID:24709317

Bertrand, A; Heissat, S; Caron, N; Viremouneix, L; Pracros, J-P; Javouhey, E; Lachaux, A; Mialou, V

2014-05-01

265

Treatment of macular edema due to retinal vein occlusions  

PubMed Central

Retinal vein occlusion (RVO) is a prevalent retinal vascular disease, second only to diabetic retinopathy. Previously there was no treatment for central retinal vein occlusion (CRVO) and patients were simply observed for the development of severe complications, generally resulting in poor visual outcomes. The only treatment for branch vein occlusion (BRVO) was grid laser photocoagulation, which reduces edema very slowly and provides benefit in some, but not all patients. Within the past year, clinical trials have demonstrated the effects of three new pharmacologic treatments, ranibizumab, triamcinolone acetonide, and dexamethasone implants. The benefit/risk ratio is best for intraocular injections of ranibizumab, making this first-line therapy for most patients with CRVO or BRVO, while intraocular steroids are likely to play adjunctive roles. Standard care for patients with RVO has changed and will continue to evolve as results with other new agents are revealed. PMID:21629578

Channa, Roomasa; Smith, Michael; Campochiaro, Peter A

2011-01-01

266

Use of bovine mesenteric vein in rescue vascular access surgery.  

PubMed

We describe a technique for rescue surgery of autologous arterovenous fistula (AVF), using bovine mesenteric vein (BMV), which may be used in patients with autologous AVF malfunction caused by steno-occlusion on the arterial side or by fibrosis of the first portion of the vein. To preserve the autologous AVF, we replaced the diseased portion of the artery, or the first centimeters of the vein, by a segment of BMV, with the aim of saving the patency and functionality of the access. We used this technique in 16 cases. All patients underwent hemodialysis treatment immediately after the procedure. Infection or aneurismal dilatation of the graft in implanted BMV was never observed. PMID:20175071

Benedetto, Filippo; Carella, Giuseppe; Lentini, Salvatore; Barillà, David; Stilo, Francesco; De Caridi, Giovanni; Spinelli, Francesco

2010-01-01

267

[Pulmonary vein ablation in atrial fibrillation. Initial experience].  

PubMed

Despite the progress in the knowledge of the pathophysiology of the atrial fibrillation (AF), the pharmacologic and non pharmacologic approach to prevent and control this arrhythmia has been shown to be discouraging. In the past few years a new type of AF has been described, of which the focal mechanism -especially bound to the pulmonary veins- allows ablation treatment through the radiofrequency (RF) with a catheter. We present our initial experience with this type of method, in two young patients who suffered from multiples episodes of AF and resistance to the conventional treatment. In both patients the RF ablation was done in the left superior pulmonary vein. One of them received an ablation in only one focus, and the other needed a veno-atrial disconnection through the elimination of the pulmonary venous potential from this vein. After three month of follow-up, patients remain asymptomatic with no relapse. PMID:12015937

Velarde, José Luis; Martellotto, Ricardo; Scanavacca, Mauricio; Arévalo, Aldo; Colque, Roberto; Jiménez, Marcelo

2002-05-01

268

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

269

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

270

Congenital Systemic-Pulmonary Collateral Vein Unexpectedly Noticed after Central Venous Catheter Insertion  

PubMed Central

Congenital systemic-pulmonary collateral vein (i.e. levoatriocardinal vein) is an uncommon cardiac anomaly. We report a rare case of congenital systemic-pulmonary collateral vein incidentally noticed after accidental migration of a central venous catheter. Cardiac CT showed the vertical vein connected to the left upper pulmonary vein (LUPV) and another thin abnormal vessel was shown running caudally from the LUPV, connecting to the coronary sinus. Furthermore, the normal connection between the LUPV and the left atrium remained. There were two levoatriocardinal veins from the LUPV without atrial egress failure. To our knowledge, this might be the first report of such a case. PMID:23555514

Yamagami, Takuji; Yoshimatsu, Rika; Matsumoto, Tomohiro; Nishimura, Tsunehiko

2012-01-01

271

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

272

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

273

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

PubMed

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

Sahoo, Ranjan Kumar; Kumar Panda, Sitansu; Bahinipati, Pravakar

2014-09-01

274

Composite vein graft reconstruction for infected descending aortic prosthesis.  

PubMed

We report a case of successful in situ replacement with a superficial femoropopliteal vein panel graft for Dacron graft infection of the thoracic aorta. A 75-year-old man presented with septicemia and pseudoaneurysm caused by methicillin resistant staphylococcus aureus 2 years after Dacron graft replacement of the mid-descending aortic aneurysm. The patient underwent in situ replacement with a panel graft constructed of 3 deep vein panels after excision of the infected Dacron graft. The patient is free of infection and doing well over 2 years after surgery. PMID:22632507

Okamoto, Hiroshi; Tamenishi, Akinori; Matsumura, Yasumoto; Niimi, Takao

2012-06-01

275

[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

276

Pericytes from human veins for treatment of myocardial ischemia  

PubMed Central

Stem cell therapies promise to regenerate the infarcted heart through the replacement of dead cardiac cells and stimulation of neovascularization. New research from our laboratory shows the transplantation of stem cells from human veins helps heart healing after an acute ischemic insult. Using a mouse model, we demonstrated that pericytes expanded from redundant human leg veins relocate around the vessels of the peri-infarct zone and release factors that promote reparative angiogenesis and cardiomyocyte survival and inhibit interstitial fibrosis. We plan to perform a first-in-man clinical trial with human pericytes in patients with refractory myocardial ischemia in the next 5 years. PMID:23313330

Katare, Rajesh G.; Madeddu, Paolo

2013-01-01

277

Early Vein Reconstruction and Right-to-Left Dissection for Left-Sided Pancreatic Tumors with Portal Vein Occlusion.  

PubMed

Large left-sided pancreatic tumors are frequently associated with portal vein (PV) and/or superior mesenteric vein (SMV) occlusion. Traditionally, vein reconstruction is deferred until after removal of the tumor. However, division of venous collaterals, as is done in a typical left-to-right fashion, leads to progressive portal hypertension and increased risk of variceal hemorrhage during the dissection. Conversely, early PV/SMV resection and reconstruction restores mesenteric-portal flow and decompresses varices, thereby enabling a safer and easier right-to-left pancreatic resection. This "How I Do It" report describes the technique and advantages of a "reconstruction-first" approach for large left-sided pancreatic tumors with venous involvement and left-sided portal hypertension. PMID:25091848

Cloyd, Jordan M; Dua, Monica M; Visser, Brendan C

2014-11-01

278

The distinct morphological and petrological features of shock melt veins in the Suizhou L6 chondrite  

NASA Astrophysics Data System (ADS)

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 1900-02000 °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.

Xie, Xiande; Sun, Zhenya; Chen, Ming

2011-03-01

279

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

280

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

281

Varicose Vein Treatments All Work, but Aren't Quite Equal  

MedlinePLUS

... this page, please enable JavaScript. Varicose Vein Treatments All Work, but Aren't Quite Equal Study found ... News) -- Three common treatments for painful varicose veins all ease symptoms, though there may be small differences ...

282

Genetics Home Reference: Alveolar capillary dysplasia with misalignment of pulmonary veins  

MedlinePLUS

... literature OMIM Genetic disorder catalog Conditions > Alveolar capillary dysplasia with misalignment of pulmonary veins (often shortened to ... May 2010 What is ACD/MPV? Alveolar capillary dysplasia with misalignment of pulmonary veins (ACD/MPV) is ...

283

Shock Veins in the Central Uplift of the Manicouagan Impact Structure  

NASA Astrophysics Data System (ADS)

We report our investigations of target rocks located in the central uplift of the Manicouagan impact structure of Quebec. Thin white veins there appear to be shock derived features similar to shock veins observed in lunar and martian meteorites.

Biren, M. B.; Spray, J. G.

2010-03-01

284

Stem cell infusion into the vein of Marshall.  

PubMed

The vein of Marshall (VOM) and related cardiac ganglia have been clearly implicated in atrial fibrillation. Electrophysiological procedures have targeted these sites of autonomic innervation. However, targeting the exact sites has proven technically challenging. Identifying the VOM and infusing stem cells may ablate related ganglia autonomic function and offer an innovative treatment for atrial fibrillation. PMID:21177278

Lyne, Jonathan C; Green, Amanda C; Alton, Eric W; Clague, Jonathan R

2011-03-01

285

Hemodynamically Driven Vein Graft Remodeling: A Systems Biology Approach  

E-print Network

to assist in the evaluation of early phase I/II clinical results, identifying those therapies most likely in an animal vein graft model, human phase I and II clinical studies were initiated.1-3 Demonstrating safety-PAAuthorManuscriptNIH-PAAuthorManuscriptNIH-PAAuthorManuscript #12;promising therapies that should move forward into clinical testing are inadequate and (2) tools

Garbey, Marc

286

Ileocolic Arteriovenous Fistula with Superior Mesenteric Vein Aneurism: Endovascular Treatment  

Microsoft Academic Search

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.

Miguel Angel De Gregorio; Maria José Gimeno; Joaquin Medrano; Caudio Schönholz; Juan Rodriguez; Horacio D’Agostino

2004-01-01

287

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

288

[Micronized purified flavonoid fraction in treatment of pelvic varicose veins].  

PubMed

Presented herein are the results of studying efficacy of micronized purified flavonoid fraction (MPFF) in treatment of pelvic varicose veins (PVV) using reference ray-tracing methods of study. We examined a total of 85 patients with PVV. Of these, 65 subjects were found to have isolated dilatation of pelvic venous plexuses (study group), and 20 were diagnosed as having combined dilation of gonadal veins and venous plexuses of the pelvis (control group). Besides clinical examination, the patients were subjected to ultrasonographic angioscanning (USAS) and emission computed tomography (ECT) of pelvic veins before treatment and 2, 6, 12, 24, 36 and 60 months after the beginning of phlebotrophic therapy. Based on the findings of the clinical and instrumental studies, it was determined that MPFF was most efficient in patients with isolated dilatation of uterine and parametrial veins. In this group of patients, pelvic pain and other symptoms of the disease disappeared completely and the clinical effect persisted for a long time (up to 6-9 months). In the control group, venotonic therapy had a positive effect which was less pronounced as compared to the control group, and pelvic pain reappeared in the nearest time (up to 3 weeks) after withdrawal of MPFF. PMID:22836331

Gavrilov, S G; Karalkin, A V; Moskalenko, E P; Beliaeva, E S; Ianina, A M; Kirienko, A I

2012-01-01

289

Hematologic abnormalities associated with various types of retinal vein occlusion  

Microsoft Academic Search

Background: The objective of this study was two-fold: (1) to investigate hematologic abnormalities associated with various types of retinal vein occlusion (RVO) and comparison of their prevalence among those various types of RVO; (2) to review the conflicting literature on the subject, to place the information in perspective. Methods: In patients with various types of RVO seen in our clinic

Sohan Singh Hayreh; Bridget M. Zimmerman; Patricia Podhajsky

2002-01-01

290

Abernethy malformation with portal vein aneurysm in a child  

PubMed Central

Abernethy malformation is an extremely rare anomaly of the splanchnic venous system. We describe multidetector computed tomography findings of an incidentally detected Abernethy malformation with portal vein aneurysm in a two-and-half-year old child. The computed tomography scan was performed for the evaluation of respiratory distress, poor growth, and loss of appetite. PMID:21430844

Chandrashekhara, Sheragaru H.; Bhalla, Ashu Seith; Gupta, Arun Kumar; Vikash, C. S.; Kabra, Susheel Kumar

2011-01-01

291

Optimal vein density in artificial and real leaves , L. Mahadevan*  

E-print Network

. Although photosynthesis, rather than water loss, is the desideratum of living leaves, the sharedOptimal vein density in artificial and real leaves X. Noblin* , L. Mahadevan*§ , I. A. Coomaraswamy. Inspired by plant leaves, we used microfluidic devices consisting of simple parallel channel networks

Mahadevan, L.

292

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

Ozturk, Muhammed Besir; Akan, Arzu; Ozkaya, Ozay; Egemen, Onur; Oreroglu, Ali R?za; Akan, Mithat

2014-01-01

293

Prevalence of true vein graft aneurysms: Implications for aneurysm pathogenesis  

Microsoft Academic Search

Background: Circumstantial evidence suggests that arterial aneurysms have a different cause than atherosclerosis and may form part of a generalized dilating diathesis. The aim of this study was to compare the rates of spontaneous aneurysm formation in vein grafts performed either for popliteal aneurysms or for occlusive disease. The hypothesis was that if arterial aneurysms form a part of a

Ian M. Loftus; Mark J. McCarthy; Andrew Lloyd; A. Ross Naylor; Peter R. F. Bell; Matthew M. Thompson

1999-01-01

294

Revascularization of the limbs using vein grafts after vascular injuries  

Microsoft Academic Search

We report on 32 patients with vascular injury of a limb undergoing a total of 41 revascularization procedures with interposition vein grafts. A combined arterial and venous injury was present in nine cases, an isolated venous injury in four, and an isolated arterial injury in 19 cases. Eighteen per cent of patients with arterial injuries had normal distal pulses on

E. Bastounis; E. Pikoulis; A. K. Leppäniemi; P. Michail; D. Alexiou

1998-01-01

295

Ischaemic central retinal vein occlusion in the young  

Microsoft Academic Search

Little is known about the behaviour of central retinal vein occlusion (CRVO) in the young. We studied the course and visual outcome in 25 patients with CRVO aged less than 40 years with special reference to the association with underlying systemic disorders. Eight patients had ischaemic CRVO while 17 had non-ischaemic CRVO. Systemic disorders associated with ischaemic CRVO included end-stage

Amod Gupta; Anita Agarwal; R K Bansal; Anupam Agarwal; K S Chugh

1993-01-01

296

Argon laser panretinal photocoagulation in ischemic central retinal vein occlusion  

Microsoft Academic Search

We conducted a prospective, planned study of argon laser panretinal photocoagulation (PRP) in ischemic central retinal vein occlusion (CRVO) over a 10-year period in 123 eyes. On comparing the lasered eyes versus the nonlasered eyes, there was no statistically significant difference between the two groups in the incidence of development of angle neovascularization (NV), neovascular glaucoma (NVG), retinal and\\/or optic

Sohan Singh Hayreh; Marie R. Klugman; Patricia Podhajsky; Gary E. Servais; Edward S. Perkins

1990-01-01

297

Retinal vein thrombosis: risk factors, pathogenesis and therapeutic approach  

Microsoft Academic Search

Retinal vein occlusion (RVO) is a relatively common dis- ease, often associated with the presence of diseases related to internal medicine. It is well known that RVO is associated with common systemic vascular disorders such as hypertension, arteriosclerosis and diabetes. Several studies using hospital-based controls have shown an increased risk of RVO in patients with arteri- opathy, or high levels

Domenico Prisco; Rossella Marcucci

2002-01-01

298

Bilateral Central Retinal Vein Occlusion Associated with Multiple Myeloma  

Microsoft Academic Search

Purpose: To report a case of simultaneous bilateral central retinal vein occlusion (CRVO) associated with multiple myeloma. Methods: A 65-year-old woman had sudden, painless loss of vision in both eyes for 20 days. Ophthalmologic examination revealed bilateral CRVO. Appropriate medical workup was conducted, and multiple myeloma was diagnosed as the underlying cause. Results: Clinical support and chemotherapy effectively controlled paraprotein

Fabio B. Aggio; Angelino J. Cariello; Manuella S. S. Almeida; Celso A. Rodrigues; Nilva S. B. de Moraes; Gisele W. B. Colleoni; Michel E. Farah

2004-01-01

299

Cilioretinal arterial circulation in central retinal vein occlusion  

Microsoft Academic Search

The hypothesis that an occlusion of the central retinal artery is an essential prerequisite for haemorrhage formation after central retinal vein obstruction has been investigated by examining the fundus changes in patients with a cilio-retinal arterial circulation; the findings are at variance with the 'combined occlusion hypothesis'. Comparisons were made between the pathological features in two retinal capillary beds with

D McLeod

1975-01-01

300

Clinical and infrared pupillometry in central retinal vein occlusion  

Microsoft Academic Search

Measurements of pupillary reactivity and size were recorded using neutral density filters and infrared pupillometry (IRP) in a prospective masked study of acute central retinal vein occlusion (CRVO) to quantify the two methods of measurement and to compare their value in the prediction of rubeosis. Thirty two patients were examined within 45 days of disease onset. The mean relative afferent

P A Bloom; D Papakostopoulos; Y Gogolitsyn; J A Leenderz; S Papakostopoulos; R H Grey

1993-01-01

301

Effect of isovolemic hemodilution in central retinal vein occlusion  

Microsoft Academic Search

Background: Hemorheologic abnormalities have recently been shown to play a role in the pathogenesis of retinal vein occlusion (RVO), and several studies have demonstrated the efficacy of isovolemic hemodilution in these eyes. This study was designed to investigate further the effects of hemodilution, with regard to the duration of symptoms before the treatment. Methods: In a prospective study, 142 eyes

Agnès Glacet-Bernard; Alain Zourdani; Myriem Milhoub; Nahed Maraqua; Gabriel Coscas; Gisèle Soubrane

2001-01-01

302

Streptokinase in central retinal vein occlusion: a controlled clinical trial  

Microsoft Academic Search

Forty patients with central retinal vein occlusion were allocated at random either to a treatment group given streptokinase followed by anticoagulatns or to a control group given no specific treatment. The two groups, which were each of 20 patients, were broadly similar in respect of clinical and laboratory values and similar in their initial visual acuity. At follow-up (\\

E M Kohner; J E Pettit; A M Hamilton; C J Bulpitt; C T Dollery

1976-01-01

303

Vein of Galen arteriovenous malformation mimicking coarctation of the aorta.  

PubMed

Arteriovenous malformation of the vein of Galen is a rare congenital intracranial anomaly lacking a capillary bed and subsequent aneurysmal enlargement of the arterial and venous system, warranting careful management due to associated morbidity and mortality. Coarctations of aorta demonstrate similar neonatal echocardiographic signs to the vein of Galen arterial malformation (VGAM). We present a boy at 37 weeks of gestation whose initial ultrasound and echocardiographic investigations showed a dominant right ventricle and isthmal hypoplasia, suggestive of coarctation of aorta. Follow-up ultrasound and echocardiography revealed an arteriovenous malformation involving middle and posterior cerebral artery branches, eliminating coarctation of aorta. VGAM was confirmed by further ultrasound and angiographic investigation, which demonstrated a tangle of cerebral and choroidal arterial branches centrally feeding into an enlarged vein of Galen. The boy's hemodynamic and neurological statuses were confirmed to be stable despite increased venous pressure. Elective embolization at 7 months of age was complicated by a cerebrovascular accident, resulting in right hemiparesis despite no residual cardiac issues. This case demonstrates that rarely, arteriovenous malformations such as the vein of Galen malformations may be the primary cause of patients presenting with coarctation of aorta. The rarity of this condition and its guarded prognosis make our case of special interest to cardiologists and the perinatal care team. PMID:25368688

Firdouse, Mohammed; Agarwal, Arnav; Mondal, Tapas

2014-12-01

304

The influence of diabetes on the vasomotor responses of saphenous vein and the development of infra-inguinal vein graft stenosis.  

PubMed

There has been a prejudice that diabetes modulates the function of saphenous vein in a manner that predisposes to bypass graft failure, although most of the evidence accrues from animal studies. We have investigated the effect of diabetes on the vasodilator responses and ultrastructure of saphenous vein harvested from patients undergoing infrainguinal bypass surgery for limb salvage and the development of stenoses within the vein grafts. Of 55 consecutive patients undergoing vein bypass surgery for critical ischemia, 16 (29%) were diabetic: diabetes was not a risk factor for graft stenosis, which occurred in 17 of 56 (30%) grafts. Endothelium-dependent relaxation by nitric oxide pathways stimulated after receptor activation (bradykinin and thrombin) was not different in vein rings from diabetic (n = 12) and nondiabetic patients (n = 12). Prostarioid-mediated vasorelaxation was absent in vein rings from diabetic patients, and the production of 6-keto prostaglandin F(1alpha) (PGF(1alpha)) from diabetic vein was only 66 +/- 27 pg x cm-2 x min-1 compared with 112 +/- 20 pg x cm-2 x min-1 from control vein (P = 0.011). Fibrinogen-mediated vasorelaxation, normally inhibited by K+ channel blockers, was negligible in vein from diabetic patients. No ultrastructural differences were observed between the endothelium of saphenous vein harvested from diabetic and nondiabetic patients. However, diabetes was associated significantly with the presence of spiraled collagen in media. The maintenance of receptor-activated stimulation of nitric oxide pathways and the damping of the response to fibrinogen in saphenous vein endothelium may provide, in part, for the good prognosis of vein graft surgery in diabetic patients: diabetes is not a risk factor for early (12 months) infrainguinal vein graft stenosis. PMID:8971090

Hicks, R C; Moss, J; Higman, D J; Greenhalgh, R M; Powell, J T

1997-01-01

305

Azygos vein aneurysm as a posterior mediastinal mass discovered after minor chest trauma.  

PubMed

Azygos vein aneurysm is a rare cause of a posterior or paratracheal mediastinal mass. Trauma or conditions causing elevated ?ow or pressure in the azygos system, such as cardiac failure or cirrhosis of the liver are secondary causes of aneurysm of the azygos vein. We report a case of asymptomatic saccular aneurysm of the azygos vein in a 45-year-old man with blunt minor chest trauma. The azygos vein aneurysm was managed by conservative treatment. PMID:24693303

Mohajeri, Gholamreza; Hekmatnia, Ali; Ahrar, Hossein; Hekmatnia, Farzane; Basiratnia, Reza

2014-01-01

306

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

307

Aberrant course of the umbilical vein in a newborn with Cornelia de Lange syndrome  

Microsoft Academic Search

Congenital anomalies of the umbilical vein are rare. We describe an aberrant course of the umbilical vein discovered by identifying\\u000a an unusual umbilical venous catheter course on abdominal radiography in a patient with Cornelia de Lange syndrome. The umbilical\\u000a vein bypassed the liver to insert directly into a right pelvic vein. Use of the lateral abdominal radiograph and sonography\\u000a were

Glen A. Toomayan; Ana Maria Gaca

2009-01-01

308

The elusive diploic veins: anthropological and anatomical perspective.  

PubMed

Diploic veins (Canales diploicae), which were identified in dogs by Dupuytren more than 200 years ago (Hecker [1845] Die anatomische Verhaltnisse und Krankheiten der Venae diploicae und Vasa emissaria. Erfahrungen und Abhandlungen im Gebiete der Chirurgie und Augenheilkunde. Erlangen), have remained inadequately understood and scantily referenced in the anatomical and anthropological literature. The tunnels formed by diploic veins are among the few known skeletal markers of soft tissue alteration. Protected by two bony laminae, diploic vein tunnels often resist postdepositional destruction and may provide a new way to assess living and extinct hominid populations. This basic research was carried out to enable future utilization of the diploic venous channels in anthropologic research. In the present study, diploic venous channels were observed radiographically in 108 human adults aged 19 years and above, 18 infants and children aged 1-18 years (Hamann-Todd Osteological Collection), eight fetuses aged 7-9 months (the Johns Hopkins Collection), and seven nonhuman primates (Hamann-Todd Osteological Collection). In addition, seven documented cases of parents and children were radiographed for genetic evaluation (Osteological Collection of The Hungarian Natural History Museum). Five distinct diploic distribution patterns were identified and described in this study. This was at variance with the impressions reported in dissection-based studies. Independence of diploic vein pattern from demographic (gender and age) and size factors and their tendency to be symmetrical make them amenable and reliable traits for skeletal population study. Diploic vein patterns appeared to be more complicated in humans than in nonhuman primates, raising the possibility of future phylogenetic applications. PMID:10096685

Hershkovitz, I; Greenwald, C; Rothschild, B M; Latimer, B; Dutour, O; Jellema, L M; Wish-Baratz, S; Pap, I; Leonetti, G

1999-03-01

309

Surgical Treatment of Varicose Veins: Effect of Rationing  

PubMed Central

INTRODUCTION A substantial part of vascular surgical workload is devoted to the treatment of varicose veins. To control demand for cosmetic venous surgery, primary care trusts in Somerset introduced clinical criteria in 2000 for the referral and treatment of varicose veins based on the presence of skin change or ulceration, a history of bleeding, or two or more episodes of thrombophlebitis. PATIENTS AND METHODS A comparison of workload and case mix for the referral and treatment of new patients presenting with varicose veins to the Taunton and Somerset Hospital was carried out over two 6-month periods, before and after the introduction of clinically based assessment criteria. RESULTS A total of 134 operations for varicose veins were carried out in 2000 and 85 such operations in 2002/03 after the introduction of new referral criteria (P = 0.001). Of these, 69% (92/134) were day-case procedures in 2000 compared to only 48% (41/85) in 2002/03 (P = 0.004). There was no significant difference in the type of cases (e.g. single, bilateral or recurrent surgery) performed as a day-case (P = 0.34) or as an in-patient (P = 0.43) over the two periods. There was, however, a significant difference (P = 0.007) in the mean ages of patients in the two periods (48.5 years in period 1; 57.8 years in period 2) and in the average ASA grade (1.15 in period 1; 1.42 in period 2; P = 0.0002). CONCLUSION The introduction of clinical criteria for the referral and treatment of varicose veins reduced workload by 37%. PMID:16460638

Re Harris, Mark; Davies, R Justin; Brown, Suki; Jones, Stephen M; Eyers, Paul S; Chester, John F

2006-01-01

310

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

311

The clinical and hemodynamic results after axillary – to – popliteal vein valve transplantation  

Microsoft Academic Search

Purpose: To evaluate the results of axillary vein to popliteal vein valve transplantation (VVTX), we reviewed the clinical, phlebographic, and noninvasive hemodynamic results in 15 patients.Methods: All patients had postthrombotic destruction of deep venous valves as determined by ascending phlebography, whereas descending phlebography demonstrated grade III or IV reflux in all patients. A segment of valve-bearing axillary vein was transplanted

John D. L. Bry; Paula A. Muto; Thomas F. O'Donnell; Lois A. Isaacson

1995-01-01

312

Bistability coordinates activation of the EGFR and DPP pathways in Drosophila vein differentiation  

E-print Network

REPORT Bistability coordinates activation of the EGFR and DPP pathways in Drosophila vein the EGFR and DPP pathways during Drosophila wing-vein differentiation. We show that simultaneous activation of both the EGFR and DPP pathways must be maintained for vein cell differentiation and that above

Shvartsman, Stanislav "Stas"

313

The durability of endoscopic saphenous vein grafts: A 5-year observational study  

Microsoft Academic Search

Background: Endoscopic saphenous vein harvest has been explored as a minimally invasive alternative to a long continuous leg incision for removal of the greater saphenous vein. The endoscopic technique uses limited incisions (2-4) with extended “skin bridges” and videoscopic equipment for the dissection and removal of the greater saphenous vein. This study was undertaken to evaluate the long-term durability of

William D. Jordan; Francisco Alcocer; David C. Voellinger; Douglas J. Wirthlin

2001-01-01

314

Taxonomical and technological characteristics of Saccharomyces spp. associated with blue veined cheese  

Microsoft Academic Search

In blue veined cheeses, the dominant yeast species in most cases is Debaryomyces hansenii. Saccharomyces spp. occurs less frequently, but they can be found in some blue veined cheeses. In the present study, the taxonomy of Saccharomyces spp. associated to blue veined cheeses was studied and comparisons made to type strains of Saccharomyces spp. and starter cultures of Saccharomyces spp.

T. K Hansen; M Jakobsen

2001-01-01

315

Pregnancy causes diminished myogenic tone and outward hypotrophic remodeling of the cerebral vein of Galen  

PubMed Central

Pregnancy increases the risk of several complications associated with the cerebral veins, including thrombosis and hemorrhage. In contrast to the cerebral arteries and arterioles, few studies have focused on the effect of pregnancy on the cerebral venous side. Here, we investigated for the first time the effect of pregnancy on the function and structure of the cerebral vein of Galen in rats. Our major finding was that cerebral veins from late-pregnant (LP, n=11) rats had larger lumen diameters and thinner walls than veins from nonpregnant (NP, n=13) rats, indicating that pregnancy caused outward hypotrophic remodeling of the vein of Galen. Moreover, veins from NP animals had a small amount of myogenic tone at 10?mm?Hg (3.9±1.0%) that was diminished in veins during pregnancy (0.8±0.3% P<0.01). However, endothelium-dependent and -independent vasodilation of the veins was unchanged during pregnancy. Using immunohistochemistry, we show that the vein of Galen receives perivascular innervation, and that serotonergic innervation of cerebral veins is significantly higher in veins from LP animals. Outward hypotrophic remodeling and diminished tone of cerebral veins during pregnancy may contribute to the development of venous pathology through elevated wall tension and wall stress, and possibly by promoting venous blood stasis. PMID:23281424

van der Wijk, Anne-Eva; Schreurs, Malou P H; Cipolla, Marilyn J

2013-01-01

316

Balloon-occluded retrograde transvenous obliteration for gastric varices via the intercostal vein  

PubMed Central

Gastric varices are usually associated with a gastro-renal (G-R) shunt. However, the gastric varices described in this case report were not associated with a G-R shunt. The inflow vessel was the posterior gastric vein and the outflow vessels were the narrow inferior phrenic vein and the dilated cardio-phrenic vein. First, percutaneous transhepatic obliteration of the posterior gastric vein was performed, but the gastric varices remained patent. Then, micro-balloon catheterization of the subphrenic vein was carried out via the jugular vein, pericardial vein and cardio-phrenic vein, however, micro-balloon-occluded inferior phrenic venography followed by micro-coil embolization of the cardio-phrenic vein revealed no delineation of gastric varices resulting in no further treatment. Thereafter, as a gastro-subphrenic-intercostal vein shunt developed, a micro-balloon catheter was advanced to the gastric varices via the intercostal vein and balloon-occluded retrograde transvenous obliteration (BRTO) was performed resulting in the eradication of gastric varices. BRTO for gastric varices via the intercostal vein has not previously been documented. PMID:22468194

Minamiguchi, Hiroki; Kawai, Nobuyuki; Sato, Morio; Ikoma, Akira; Sawa, Munehisa; Sonomura, Tetsuo; Sahara, Shinya; Nakata, Kouhei; Takasaka, Isao; Nakai, Motoki

2012-01-01

317

Natural history of infrainguinal vein graft stenosis relative to bypass grafting technique  

Microsoft Academic Search

Purpose: To determine whether the incidence of vein graft stenosis is related to bypass grafting technique and thus modification of postoperative surveillance protocols may be required.Methods: From 1991 to 1996, 338 infrainguinal vein bypasses constructed using in situ (n = 131), reversed (n = 120), nonreversed translocated (n = 48), or spliced\\/upper extremity vein (n = 39) grafting techniques were

Ashish K. Gupta; Dennis F. Bandyk; Daycha Cheanvechai; Brad L. Johnson

1997-01-01

318

Genetic variability in the coat protein genes of lettuce big-vein associated virus and Mirafiori lettuce big-vein virus  

Microsoft Academic Search

Summary. Available data suggests that lettuce big-vein disease is caused by the ophiovirus Mirafiori lettuce big-vein virus (MLBVV) but not by the varicosavirus Lettuce big-vein-associated virus (LBVaV), although the latter is frequently associated with the disease. Since the disease occurs worldwide, the putative coat protein (CP) open reading frames of geographically distinct isolates of MLBVV and LBVaV were sequenced. Comparison

J. A. Navarro; V. A. Torok; H. J. Vetten; V. Pallas

2005-01-01

319

Circulating Inflammatory Cells Are Associated with Vein Graft Stenosis  

PubMed Central

Objective Infrainguinal autogenous vein grafts are especially prone to narrowing and failure, and both inflammatory and thrombotic pathways are implicated. Platelets and monocytes are the key thrombo-inflammatory cells that arrive first at sites of vascular injury. These cells have potent interactions that recruit and activate one another, propagating thrombotic and inflammatory responses within the vessel wall. We therefore hypothesized that elevated levels of platelet-monocyte aggregates might be associated with stenosis, and could possibly discriminate between patients with or without vein graft stenosis. Design of Study Thirty-six vascular surgery patients were studied, in a stable quiescent period after infrainguinal autogenous vein graft bypasses for occlusive disease. Eighteen patients had hemodynamically significant graft stenoses confirmed by imaging, and 18 were free from stenosis. The level of platelet-monocyte aggregates (PMA) in whole blood was quantified after blood draw using 2-color flow cytometry. Three measurements were made per sample: the basal, in-vivo level of aggregates (Baseline PMA); the predisposition to spontaneously generate PMA (Spontaneous PMA); and PMA generation by the addition of exogenous thrombin receptor activating peptide (Stimulated PMA). The baseline, in-vivo level of PMA was estimated by immediate flow analysis. The predisposition to spontaneously generate PMA was measured after in-vitro incubation. Responsiveness to thrombin stimulation of the blood was quantified by the in vitro dose response to an exogenous thrombin receptor activating peptide (sfllrn). Results Baseline PMA levels were similar in patients with vein graft stenosis vs. non-stenosis (14.8% ±3.2 versus 10.1% ±1.5 respectively, mean ±sem). However, patients with stenosis showed higher Spontaneous PMA levels (58.5% ±4.5 vs. 28.3 % ±4.3, P< .01), and higher Stimulated PMA levels (P< .001, ANOVA). Covariables of smoking, diabetes, statin or antithrombotic therapy could not account for these differences. Conclusions Platelet-monocyte reactivity may play a role in the development of vein graft stenoses. Those with/without stenosis differed primarily in their threshold, or predisposition to form aggregates (Spontaneous PMA), while their basal circulating levels of PMA (Baseline PMA) were similar. These measurements may unmask pathologic differences in thrombo-inflammatory responsiveness that are not apparent in basal measurements. Understanding the causes and mechanisms leading to abnormal platelet-monocyte responses may improve approaches to predicting or preventing vein graft stenosis. PMID:21906902

Moreno, Katherine; Murray-Wijelath, Jacqui; Yagi, Mayumi; Kohler, Ted; Hatsukami, Thomas; Clowes, Alexander; Sobel, Michael

2011-01-01

320

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

321

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

322

A review of the anatomy and clinical significance of adrenal veins.  

PubMed

The adrenal veins may present with a multitude of anatomical variants, which surgeons must be aware of when performing adrenalectomies. The adrenal veins originate during the formation of the prerenal inferior vena cava (IVC) and are remnants of the caudal portion of the subcardinal veins, cranial to the subcardinal sinus in the embryo. The many communications between the posterior cardinal, supracardinal, and subcardinal veins of the primordial venous system provide an explanation for the variable anatomy. Most commonly, one central vein drains each adrenal gland. The long left adrenal vein joins the inferior phrenic vein and drains into the left renal vein, while the short right adrenal vein drains immediately into the IVC. Multiple variations exist bilaterally and may pose the risk of surgical complications. Due to the potential for collaterals and accessory adrenal vessels, great caution must be taken during an adrenalectomy. Adrenal venous sampling, the gold standard in diagnosing primary hyperaldosteronism, also requires the clinician to have a thorough knowledge of the adrenal vein anatomy to avoid iatrogenic injury. The adrenal vein acts as an important conduit in portosystemic shunts, thus the nature of the anatomy and hypercoagulable states pose the risk of thrombosis. Clin. Anat. 27:1253-1263, 2014. © 2014 Wiley Periodicals, Inc. PMID:24737134

Cesmebasi, Alper; Du Plessis, Maira; Iannatuono, Mark; Shah, Sameer; Tubbs, R Shane; Loukas, Marios

2014-11-01

323

Crystallization pressure versus “crack seal” as the mechanism for banded veins  

NASA Astrophysics Data System (ADS)

Banded fibrous veins are often pointed to as evidence for episodic crack opening driven by oscillations in fluid pressure or bulk strain. Advances in understanding the geochemistry of precipitation, data on veins, and experiments suggest that pressure due to growing crystals may be an alternate explanation for many observations on these types of veins. We propose that some veins originate at sites of precipitation and then propagate due to the pressure exerted by the crystal growth. As materials precipitate, the vein walls are pushed apart. The resulting veins have shapes typical for mode I cracks except that, mechanically, crystallization pressure replaces the role of internal fluid pressure in their propagation. A nonzero remote differential stress serves to align veins. Mechanical and geochemical considerations suggest that this process will be most important in fine-grained rocks such as greenschist-grade pelites where diffusion from sites of dissolution rather than advection is the dominant mass-transport process. Veins may owe their orientation to tectonism, but their initiation and growth are due to processes that supersaturate the pore fluid. Veins formed by this mechanism involve cracking to the extent that precipitation forces an original flaw to extend during precipitation. Cyclic quartz-mica bands may indicate geochemical self-organization at the vein wall driven by pressure-solution-enhanced supersaturation in the pore fluid and nonlinear precipitation kinetics at the vein wall.

Wiltschko, David V.; Morse, John W.

2001-01-01

324

Postpartum ovarian vein thrombosis presenting as ureteral obstruction  

PubMed Central

Ovarian vein thrombosis (OVT) is a relatively uncommon but serious postpartum complication. Although infrequent, OVT may progress to involve the inferior vena cava, the renal vein or may cause sepsis and septic pulmonary embolism, all of which are potentially life-threatening. Clinical misdiagnosis is common, and, unfortunately, most affected women undergo laparotomy for possible appendicitis. We present an interesting case of OVT presenting as ureteral obstruction in a postpartum woman who was in her early 20s. Knowledge of this entity and clinical suspicion for its occurrence, in a puerperal patient with fever and abdominal pain not responding to antibiotics, should guide clinicians to appropriate diagnosis and treatment, avoiding misdiagnosis, unnecessary laparotomy and potential complications. PMID:22767678

Kolluru, Anuradha; Lattupalli, Rakesh; Kanwar, Manreet; Behera, Deepak; Kamalakannan, Desikan; Beeai, Muhammed K

2010-01-01

325

Asymptomatic anomalous pulmonary veins in a Siberian Husky.  

PubMed

A 2-year-old, neutered male Siberian Husky presented with depression, weight loss and an inability to prehend food and water. Cerebrospinal fluid was collected under general anaesthesia prior to euthanasia. The elevated white cell count comprised mostly mononuclear cells. Histological changes within the brain were variable and multifocal. Non-suppurative meningitis secondary to lymphoma was diagnosed. At necropsy, abnormal venous drainage of the right cranial and middle lung lobes was found. A dilated major pulmonary vein from these lobes passed across the lateral aspect of the right caudal lung lobe prior to entering the heart, and subpleural veins from the affected lobes were enlarged and tortuous. These vascular abnormalities were considered incidental. There were no apparent congenital abnormalities of the heart and the animal's clinical signs were related to lymphoma of the brain. PMID:15084052

Abraham, L A; Slocombe, R F

2003-07-01

326

Isolated rupture of the superficial vein of the penis.  

PubMed

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

2014-05-01

327

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

328

[Effectiveness of laser therapy in retinal vein thrombosis].  

PubMed

The authors compared the results of treatment in a group of patients (1st group--20 persons) with a retinal vein thrombosis with a second group (24 persons--25 eyes) treated pharmacologically with a simultaneous laser photocoagulation performed by argon and crypton lasers. Improvement of the visual acuity in late observations was established in 40 per cent of eyes of the 1st group and in 64 per cent of the 2d group; worsening was observed in 55 per cent of eyes of the 1st group and in 8 per cent of the 2d group. The authors consider that an early applied laser photocoagulation is beneficial in the treatment of the retinal vein thrombosis and besides that pharmacological treatment coupled with laser photocoagulation gives much better results than the pharmacotherapy alone. PMID:2266693

Palacz, O; Sylwestrzak, Z

1990-07-01

329

Successful arterial substitution with modified human umbilical vein.  

PubMed Central

Human umbilical veins were prepared as vascular grafts by tanning with dialdehyde starch or gluteraldehyde and by structural re-inforcement with an outer polyester fiber mesh. These grafts were implanted in baboons in the aortoiliac position for periods of 3 days to 9 months. There was no aneurysm formation and there was an excellent maintenance of patency as well as function. Histologic evaluation of the graft materials showed a dense collagen layer within the encircling polyester fiber mesh. A multicellular subintimal layer formed a discrete inner capsule. The inflammatory response with the umbilical component was insignificant. There was no evidence of rejection. This study suggests that the modified umbilical vein can serve as a satisfactory blood conduit. Experience with three short-term clinical implants supports the applicability and potential for this new vascular graft. Images Fig. 1. Fig. 2. Fig. 3. Fig. 4. Fig. 5. Fig. 6. Fig. 7. Fig. 8. Fig. 9. PMID:816263

Dardik, H; Dardik, I I

1976-01-01

330

Blunt injury of the innominate artery and left innominate vein.  

PubMed

Injuries to the branches of the aortic arch are rare and may be caused by blunt, penetrating, blast or iatrogenic trauma. Innominate vascular injury is a rare entity, particularly in blunt trauma. It is estimated that 71% of patients with innominate injuries die before arrival at the hospital. We report here a successfully managed case of a combined blunt trauma of the innominate artery and transection of the left innominate vein after blunt injury to the chest. PMID:21742937

Davidovic, Lazar; Ilic, Nikola; Cvetkovic, Slobodan; Koncar, Igor; Colic, Momcilo; Vjestica, Milica

2011-08-01

331

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

332

Adularia in epithermal veins, Queensland: morphology, structural state and origin  

Microsoft Academic Search

Four types of adularia (i.e. sub-rhombic, rhombic, tabular and pseudo-acicular) are recognised from examination of samples from ten epithermal vein deposits and prospects in Queensland, based on morphology of the individual crystals. Further investigation of the structural state of adularia reveals that each group has some specific features in terms of the degree of Al\\/Si disordering, which can be related

G. Dong; G. W. Morrison

1995-01-01

333

Portal vein thrombosis after splenectomy for gastric malignant lymphoma.  

PubMed

Portal vein thrombosis (PVT) has rarely been documented in patients after splenectomy for gastric malignancy. We report a case of PVT that occurred after splenectomy as part of an en-bloc node dissection performed to treat gastric malignant lymphoma. A 38-year-old man underwent total gastrectomy and splenectomy with en-bloc D2 lymph node dissection. The spleen weighed 480 g. On postoperative day (POD) 31, the patient complained of abdominal pain in the right upper quadrant accompanied by fever. Moderate elevations of C-reactive protein (CRP), aspartate transaminase (AST), and alanine transaminase (ALT) were noted. Contrast-enhanced computed tomography (CT) and ultrasonography disclosed thrombus in the portal vein and the splenic vein. There were no abnormalities in the levels of lupus anticoagulant, protein C antigen, protein S antigen, or antithrombin III (AT III). A diagnosis of PVT was made, and prompt treatment, including intravenous heparin combined with tissue plasminogen activator (tPA) was initiated, followed by longterm warfarin. This treatment resulted in clinical improvement, but failed to achieve thrombolysis in the portal vein. At follow-up after 6 months, the patient complained of postprandial abdominal pain with persistent peripheral edema and ascites. This case indicates that splenectomy for en-bloc node dissection in gastric malignancy is a possible cause of PVT. Because both the symptoms and the laboratory data in PVT are nonspecific, a high level of clinical suspicion and a low threshold for obtaining imaging examinations are important in the early diagnosis of PVT. Surgeons should remember PVT among several other complications whenever patients treated with radical gastrectomies are symptomatic and imaging studies are considered necessary. PMID:14716520

Fujitani, Kazumasa; Nishiyama, Akiko; Tsujinaka, Toshimasa; Hirao, Motohiro; Hasuike, Yasunori; Takeda, Yutaka

2003-01-01

334

Deep vein thrombosis following prolonged kneeling: a case report.  

PubMed

This report describes a fibreglass mould maker in the yacht building industry who developed a deep vein thrombosis (DVT) after 6 weeks of working in a kneeling position. We propose that his prolonged kneeling combined with constrictive knee pad straps caused vascular compression, precipitating his DVT. A hypercoagulability diathesis was suspected but not confirmed. Operator and employer education, modified work practices and strapless knee pads are suggested as possible preventive measures. PMID:24727563

van Beeck, J Looringh; Versfeld, K; Ehrlich, R

2014-06-01

335

Drosophila Smad2 Opposes Mad Signaling during Wing Vein Development  

PubMed Central

In the vertebrates, the BMP/Smad1 and TGF-?/Smad2 signaling pathways execute antagonistic functions in different contexts of development. The differentiation of specific structures results from the balance between these two pathways. For example, the gastrula organizer/node of the vertebrates requires a region of low Smad1 and high Smad2 signaling. In Drosophila, Mad regulates tissue determination and growth in the wing, but the function of dSmad2 in wing patterning is largely unknown. In this study, we used an RNAi loss-of-function approach to investigate dSmad2 signaling during wing development. RNAi-mediated knockdown of dSmad2 caused formation of extra vein tissue, with phenotypes similar to those seen in Dpp/Mad gain-of-function. Clonal analyses revealed that the normal function of dSmad2 is to inhibit the response of wing intervein cells to the extracellular Dpp morphogen gradient that specifies vein formation, as measured by expression of the activated phospho-Mad protein. The effect of dSmad2 depletion in promoting vein differentiation was dependent on Medea, the co-factor shared by Mad and dSmad2. Furthermore, double RNAi experiments showed that Mad is epistatic to dSmad2. In other words, depletion of Smad2 had no effect in Mad-deficient wings. Our results demonstrate a novel role for dSmad2 in opposing Mad-mediated vein formation in the wing. We propose that the main function of dActivin/dSmad2 in Drosophila wing development is to antagonize Dpp/Mad signaling. Possible molecular mechanisms for the opposition between dSmad2 and Mad signaling are discussed. PMID:20442782

Sander, Veronika; Eivers, Edward; Choi, Renee H.; De Robertis, Edward M.

2010-01-01

336

Multiple extra macular branch retinal vein occlusions in hyperhomocysteinemia  

PubMed Central

Hyperhomocysteinemia is a well-known modifiable risk factor for thromboembolism. Retinal vascular occlusion in patients having hyperhomocysteinemia is a known entity, particularly in young patients. However, multiple extra macular branch retinal vein occlusion (BRVO) is a rare condition, which can be a presentation of this disease. We present a patient who had multiple extra macular BRVO; on complete systemic workup, he was found to have raised homocysteine levels. PMID:24817751

Gore, Abhijit Diwakar; Rao, Girish Shiva; Gore, Mansi Abhijit; Desai, Abhishek R

2014-01-01

337

Postoperative hypercoagulability and deep-vein thrombosis after laparoscopic cholecystectomy  

Microsoft Academic Search

Patients who undergo laparoscopic cholecystectomy (LC) are operated on under general anesthesia, in a reverse Trendelenburg position, with 12–15-mmHg pneumoperitoneum. All of these factors can induce venous stasis of the legs, which may lead to postoperative deep-vein thrombosis (DVT). The objectives of this study were to assess the degree of hypercoagulability and to determine the rate of postoperative DVT in

J. A. Caprini; J. I. Arcelus; M. Laubach; K. N. Hoffman; R. W. Coats; S. Blattner

1995-01-01

338

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

339

Multifocal electroretinographic features of central retinal vein occlusion  

Microsoft Academic Search

The purpose of this research was to To determine the features of wide-field multifocal electroretinography (WF-mfERG) recorded in patients with central retinal vein occlusion (CRVO) and to compare WF-mfERG responses of the affected and fellow eyes. In addition, WF-mfERG responses were also compared by using standard electroretinography (ERG). WF-mfERG and ERG responses were recorded from both eyes of 56 patients

Fiona M. Dolan; Stuart Parks; David Keating; Gordon N. Dutton; Aled L. Evans

2003-01-01

340

Mortality and Morbidity in Patients with Central Retinal Vein Occlusion  

Microsoft Academic Search

We investigated the risk of mortality and morbidity in 78 patients with central retinal vein occlusion (CRVO) followed for more than 2 years (mean follow-up 7.2 years). Thirteen subjects died at an average of 7.0 years after CRVO. Five subjects developed myocardial infarction at an average of 2.8 years after CRVO, and 1 developed a cerebrovascular accident 3 years after

A. M. Mansour; Joseph B. Walsh; Paul Henkind

1992-01-01

341

Glucose6Phosphate Dehydrogenase Deficiency in Retinal Vein Occlusion  

Microsoft Academic Search

PURPOSE. Glucose-6-phosphate dehydrogenase (G6PD) defi- ciency is one of the most common human genetic abnormali- ties, with a high prevalence in Sardinia, Italy. Evidence indi- cates that G6PD-deficient patients are protected against ischemic heart and cerebrovascular disease. The purpose of this study was to assess the frequency of G6PD deficiency in Sardinian patients with retinal vein occlusion (RVO) and to

Antonio Pinna; Ciriaco Carru; Giuliana Solinas; Angelo Zinellu; Francesco Carta

2007-01-01

342

Radial optic neurotomy for ischaemic central vein occlusion  

Microsoft Academic Search

Background\\/aims: Ischaemic central retinal vein occlusion (CRVO) accounts for 20–50% of all CRVO. No treatment has been proved to be effective. The efficacy of radial optic neurotomy (RON) was evaluated in eyes with ischaemic CRVO.Methods: 10 patients with ischaemic CRVO underwent RON. After pars plana vitrectomy, a microvitreoretinal blade was used to incise the scleral ring, cribriform plate, and adjacent

C S Marti?nez-Jardo?n; A Meza-de Regil; J Dalma-Weiszhausz; C Leizaola-Ferna?ndez; V Morales-Canto?n; J L Guerrero-Naranjo; H Quiroz-Mercado

2005-01-01

343

Supernormal Cone Electroretinogroms in Central Retinal Vein Occlusion  

Microsoft Academic Search

In 12 successive cases of unilateral central retinal vein occlusion (CRVO), the strongly light-adapted cone electroretinogram (both a- and b-wave) was always slower and larger (supernormal) to long-wave stimuli compared with that of the unaffected eye. This supernormality became less as the level of light adaptation decreased; in the dark-adapted state, long-wave stimuli produced subnormal responses from the affected eye

P. Gouros; C. J. MacKay

1992-01-01

344

Hyperhomocysteinemia and central retinal vein occlusion in Iranian population  

Microsoft Academic Search

Purpose To evaluate total plasma homocysteine level during the acute phase of central retinal vein occlusion (CRVO) in the Iranian\\u000a population and determine whether hyperhomocysteinemia is also a risk factor for CRVO. Methods Fifty-four patients with recently diagnosed CRVO were studied. Their fasting total plasma homocysteine level was compared\\u000a with a matched control group of 51 patients evaluated in the

Sasan Moghimi; Zahra Najmi; Hooshang Faghihi; Reza Karkhaneh; Mohammad Sadegh Farahvash; Maryam Maghsoudipour

2008-01-01

345

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

346

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

347

How to implement an office-based vein program.  

PubMed

Peripheral venous disease is a highly prevalent problem affecting over 25-30 million people in the United States. Office-based treatment of superficial veins for chronic venous insufficiency is a fast-growing area with a recent surge of interest by cardiologists in this field. We describe our own experience with establishing a vein clinic in a single-specialty, cardiology-based office, and provide tips and tricks on how you can start your own vein program. A program based on the mission of providing high-quality, appropriate care to patients and with knowledgeable providers and staff is of paramount importance for the reputation and growth of the clinic. Other important factors needed for success include diligent oversight by a director and/or supervisor, an efficient precertification process, prompt billing and coding, and establishing an internal database or participation in a national venous database to track outcomes and complications. Regular meetings of all clinic participants that discuss quality, outcomes, and operational issues are essential to help standardize care and meet the recently launched Intersocietal Accreditation Commission standards. PMID:25198494

Shammas, Nicolas W; Hauber, William

2014-09-01

348

A dynamical system that describes vein graft adaptation and failure.  

PubMed

Adaptation of vein bypass grafts to the mechanical stresses imposed by the arterial circulation is thought to be the primary determinant for lesion development, yet an understanding of how the various forces dictate local wall remodeling is lacking. We develop a dynamical system that summarizes the complex interplay between the mechanical environment and cell/matrix kinetics, ultimately dictating changes in the vein graft architecture. Based on a systematic mapping of the parameter space, three general remodeling response patterns are observed: (1) shear stabilized intimal thickening, (2) tension induced wall thinning and lumen expansion, and (3) tension stabilized wall thickening. Notable is our observation that the integration of multiple feedback mechanisms leads to a variety of non-linear responses that would be unanticipated by an analysis of each system component independently. This dynamic analysis supports the clinical observation that the majority of vein grafts proceed along an adaptive trajectory, where grafts dilate and mildly thicken in response to the increased tension and shear, but a small portion of the grafts demonstrate a maladaptive phenotype, where progressive inward remodeling and accentuated wall thickening lead to graft failure. PMID:23871714

Garbey, Marc; Berceli, Scott A

2013-11-01

349

Fabrication of subcutaneous veins phantom for vessel visualization system  

NASA Astrophysics Data System (ADS)

The technique of subcutaneous veins imaging by using NIR (Near Infrared Radiation) is widely used in medical applications, such as the intravenous injection and the blood sampling. In the previous study, an automatic 3D blood vessel search and automatic blood sampling system was newly developed. In order to validate this NIR imaging system, we adopted the subcutaneous vein in the human arm and its artificial phantom, which imitate the human fat and blood vessel. The human skin and subcutaneous vein is characterized as the uncertainty object, which has the individual specificity, non-accurate depth information, non-steady state and hardly to be fixed in the examination apparatus. On the other hand, the conventional phantom was quite distinct from the human's characteristics, such as the non-multilayer structure, disagreement of optical property. In this study, we develop a multilayer phantom, which is quite similar with human skin, for improvement of NIR detection system evaluation. The phantom consists of three layers, such as the epidermis layer, the dermis layer and the subcutaneous fat layer. In subcutaneous fat layer, we built a blood vessel. We use the intralipid to imitate the optical scattering characteristics of human skin, and the hemoglobin and melanin for the optical absorption characteristics. In this study, we did two subjects. First, we decide the fabrication process of the phantom. Second, we compared newly developed phantoms with human skin by using our NIR detecting system, and confirm the availability of these phantoms.

Cheng, Kai; Narita, Kazuyuki; Morita, Yusuke; Nakamachi, Eiji; Honda, Norihiro; Awazu, Kunio

2013-09-01

350

Metachronous renal vein and artery injure after percutaneous nephrostolithotomy  

PubMed Central

Background Percutaneous nephrostolithotomy is important approach for kidney stones removal. A percutaneous nephrostomy drainage tube placement is an effective method to stop venous bleeding. Occasionally, the catheter can pierce into the renal parenchyma, and migrate into the renal vein even to the vena cava. Case presentation A 66-year-old woman underwent a percutaneous nephrostolithotomy for kidney staghorn stone complicating severe bleeding. A computed tomography angiography showed the percutaneous nephrostomy drainage tube inside the renal vein. The percutaneous nephrostomy drainage tube was withdrawn 3 cm back to the renal parenchyma/sinus/pelvis in stages with the surgical team on standby. Seven days later, the patient developed severe hematuria. Computed tomography angiography demonstrated the pseudoaneurysm located near the percutaneous nephrostomy drainage tube. Pseudoaneurysm is embolized successfully. Conclusion Our case shows intravenous misplacement of the nephrostomy tube and subsequent pseudoaneurysm after percutaneous nephrostolithotomy. To our knowledge, this seems to be the first documentation of major bleeding from the injury to both renal vein and artery. The percutaneous nephrostomy drainage tube can be withdrawn back to the renal parenchyma/sinus/pelvis in stages with the surgical team on standby, and the withdrawn distance may vary according to patient and catheter position. PMID:24304827

2013-01-01

351

Radiofrequency ablation as first-line treatment of varicose veins.  

PubMed

Endovascular radiofrequency ablation is a minimally invasive method to safely treat symptomatic refluxing varicose veins. A retrospective chart review was used to determine patient demographics, disease severity, treatment algorithm, and outcome in patients who underwent radiofrequency ablation of symptomatic refluxing veins that had failed conservative management. Statistical analysis was done using GraphPad Demo Version (San Diego, CA). Two hundred forty-one limbs in 179 patients (average age, 53 years; 73% females, 27% males) were treated. Preprocedure Clinical Etiological Anatomic and Pathologic (CEAP) scores were C2s: 236, C3s: 4, and C5s:1. Procedures were performed in the office using tumescent anesthetic; all patients could ambulate immediately after the procedure. Postprocedure total occlusion (TO) rate was seen in 93 per cent of limbs (223 limbs) at 3 months and 91 per cent of limbs (220 limbs) at 12 months posttreatment. No relationship was found between patients who did not have total occlusion and age, sex, diameter of veins, CEAP scores, preoperative reflux time, and volume of tumescent anesthetic (P > 0.05). The VNUS procedure is an in-office, minimally invasive procedure with a low complication rate and quick recovery. Total occlusion rates are high and there is improvement in disease severity after treatment. PMID:24666862

Avery, John; Kumar, Keshav; Thakur, Vijaya; Thakur, Anjani

2014-03-01

352

Intentional complete interruption of a retinal vein after vitrectomy might improve the rate of successful chorioretinal venous anastomosis formation in central retinal vein occlusion  

Microsoft Academic Search

Background. Laser or surgical chorioretinal venous anastomosis has not become widespread as suitable treatment for central retinal vein occlusion (CRVO). We report here the effectiveness of cutting off a retinal vein with vitrectomy in making a chorioretinal venous anastomosis in CRVO. Methods. We performed a vitrectomy accompanied by a chorioretinal venous anastomosis procedure for seven consecutive patients with CRVO. These

Kan Koizumi; Masatoshi Nishiura; Takami Yamamoto; Teruyo Machida; Tomiko Nakamura; Masayuki Ouchi; Shigeru Kinoshita

2002-01-01

353

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

354

Computer-assisted diagnostic tool to quantify the pulmonary veins in sickle cell associated pulmonary hypertension  

NASA Astrophysics Data System (ADS)

Pulmonary hypertension is a common cause of death among patients with sickle cell disease. This study investigates the use of pulmonary vein analysis to assist the diagnosis of pulmonary hypertension non-invasively with CT-Angiography images. The characterization of the pulmonary veins from CT presents two main challenges. Firstly, the number of pulmonary veins is unknown a priori and secondly, the contrast material is degraded when reaching the pulmonary veins, making the edges of these vessels to appear faint. Each image is first denoised and a fast marching approach is used to segment the left atrium and pulmonary veins. Afterward, a geodesic active contour is employed to isolate the left atrium. A thinning technique is then used to extract the skeleton of the atrium and the veins. The locations of the pulmonary veins ostia are determined by the intersection of the skeleton and the contour of the atrium. The diameters of the pulmonary veins are measured in each vein at fixed distances from the corresponding ostium, and for each distance, the sum of the diameters of all the veins is computed. These indicators are shown to be significantly larger in sickle-cell patients with pulmonary hypertension as compared to controls (p-values < 0.01).

Jajamovich, Guido H.; Pamulapati, Vivek; Alam, Shoaib; Mehari, Alem; Kato, Gregory J.; Wood, Bradford J.; Linguraru, Marius George

2012-03-01

355

Serratus anterior venous tributary as a second outflow vein in latissimus dorsi free flaps.  

PubMed

The latissimus dorsi (LD) flap is a large and reliable myocutaneous flap with a consistently long vascular pedicle. However, the limitation of the thoracodorsal pedicle is that it has only one draining vein for anastomosis. We describe a simple technique of recruiting the tributary vein to the serratus anterior and using it as a second draining vein to alleviate congestion in lower limb reconstruction. The serratus anterior venous tributary segment is cut back to an avalvular segment which averages 5 mm in length. Provision of an additional venous outflow to the flap enabled a second venous anastomosis to the short saphenous vein (N = 1), the long saphenous vein (N = 2), a deep vein (N= 1), and to a deep vein via a vein graft (N = 1), respectively. Five patients with degloving injury of the lower extremity of sizes 150 cm(2) (10 × 15 cm) to 260 cm(2) (10 × 26 cm) underwent successful reconstruction using the LD muscle flap with the serratus anterior tributary vein as a second outflow vein. This serratus anterior venous tributary serves as a useful second outflow channel for alleviating venous congestion during lower limb reconstructive surgery and should be routinely preserved as a lifeboat. PMID:21796583

Goh, Terence; Tan, Bien-Keem; Ong, Yee-Siang; Chew, Winston

2011-10-01

356

An unusual case of the cephalic vein with a supraclavicular course.  

PubMed

While the subclavian or axillary vein can be safely and successfully punctured in the majority of cases, some device implanters still prefer cut down to the cephalic vein as the initial approach to venous access for transvenous placement of pacemaker or defibrillator leads out of concern for the risk of pneumothorax, subclavian crush, and other possible complications. However, very occasionally, the cephalic vein crosses superficial to the clavicle to join the external jugular vein, making it rather unappealing for this purpose. Relying on a guide wire introduced through the cephalic vein to guide puncture of the subclavian vein is unlikely to be successful in such a situation and may cause accidental damage to the vital structures in the thoracic inlet region. Device implanters need to be aware of this anatomical anomaly because of the implications for transvenous lead placement. PMID:17461885

Lau, Ernest W; Liew, Reginald; Harris, Stuart

2007-05-01

357

[Positioning of hemodialysis catheters after locating the internal jugular vein by echo-Doppler].  

PubMed

Despite significant progress, vascular access remains a major concern for nephrologists. For the last 6 years we have used as temporary vascular access silastic twin catheters implanted into the internal jugular vein based on Canaud's method. We have developed in 15 patients an ultrasound-guided method using an ultrasonic Doppler to improve access to the internal jugular vein, prior to its catheterization. Ultrasound assistance was provided by a 5MHz mechanical sectorscanning transducer (Toshiba 270A). The internal jugular vein and carotid artery were visualized. The skin overlying the internal jugular vein was marked with indelebile ink. The internal jugular vein was cannulated successfully in 14 patients. The use of ultrasound guidance to cannulate the internal jugular vein improves success, and reduces complications. This method is recommended in patients with distorted cervical or subclavicular anatomic characteristics, or with bleeding tendency. PMID:8047193

Page, B; Souissi, M; Legendre, C; Moreau, J F

1994-01-01

358

Transection of left common pulmonary vein during left upper lobectomy: how should it be reconstructed?  

PubMed Central

A common trunk of the left pulmonary vein is an anatomical variation in the pulmonary vessels and may be incidentally transected during left upper lobectomy. Difficulty in reconstruction of the left inferior vein often requires completion pneumonectomy. We herein describe a patient with lung cancer in the left upper lobe of the lung. His common trunk of the left pulmonary vein was incidentally transected with a mechanical stapler during a thoracoscopic left upper lobectomy. The concomitantly transected inferior pulmonary vein was augmented with a cuff technique using an orifice of the superior vein followed by end-to-end anastomosis. The postoperative course was uneventful. This technique should also be considered in patients with lung cancer when a right upper lobe tumor is invading the right superior trunk branching pulmonary veins to the upper and middle lobes. PMID:24968424

Endo, Tetsuya; Tetsuka, Kenji; Yamamoto, Shinichi; Aizawa, Kei; Endo, Shunsuke

2012-01-01

359

Absorption of carbon dioxide during endoscopic vein harvest  

PubMed Central

OBJECTIVES Carbon dioxide (CO2) insufflation was used by some devices for endoscopic vein harvest to create a subcutaneous tunnel and facilitate the vein harvest. In the literature, some cases of CO2 micro- and macro-embolisms or hypercarbia during this procedure are described. The purpose of this study was to evaluate if the use of an open CO2 system rather than a sealed system might be associated with different CO2 absorption during the procedure. METHODS Patients were randomized into two groups: those patients in the first group were submitted to endoscopic vein harvest using a sealed CO2 insufflation; in the second group, the harvest was undertaken with an open CO2 insufflation. Partial pressure of CO2 in the arterial blood (PaCO2) and end-tidal CO2 (ETCO2) was recorded following anaesthesia induction and before the endoscopic procedure (T0), every 10 min during the endoscopic step (T1) and end after 10 min from the CO2 insufflation termination (T2). RESULTS A total of 60 patients were enrolled. PaCO2 increased significantly between T0, T1 and T2 in both groups (P = 0.0001) during the endoscopic harvest, but the PaCO2 level was significantly higher in the group that used the sealed system (44.5 ± 7.9 vs 39.7 ± 7.9 mmHg) at the end of the procedure (P = 0.01). No significant differences between end-tidal CO2 measured at the same intervals between groups were detected. CONCLUSIONS There was a constant increase in the blood gas concentration compared with the basal pre-procedure values. Sealed systems were associated with a significantly higher CO2 concentration at the end of the procedure compared with the open ones. PMID:22761115

Zingaro, Carlo; Pierri, Michele Danilo; Massi, Francesco; Matteucci, Marco Luciano Sacha; Capestro, Filippo; D'Alfonso, Alessandro; Aratari, Carlo; Torracca, Lucia

2012-01-01

360

The Middle Thyroid Vein: Anatomical and Surgical Aspects  

Microsoft Academic Search

Background  An issue that has been overlooked in medical literature concerns the prevalence and topographic relationships of the middle\\u000a thyroid vein (MTV), which have been studied, with a prospective approach, in patients with various thyroid diseases.\\u000a \\u000a \\u000a \\u000a Methods  MTV prevalence has been investigated in 394 consecutive lobes and a number of different variables (age, gender, thyroid pathology,\\u000a gland weight) have been considered. Moreover,

Gianlorenzo Dionigi; Terenzio Congiu; Francesca Rovera; Luigi Boni

2010-01-01

361

Histological Study on the Left Common Iliac Vein Spur  

PubMed Central

The spur occasionally seen in a left common iliac vein was investigated by anatomical and histological examination of cadavers so the occurrence mechanism could be discussed. Spurs were found in six cases of the 28 cadavers (21.4%) and they were classified into few different kinds of composition of endosporia, tunica media and adventitia. It is considered that there may be different formation mechanisms and stages even in cases of similar anatomical finding. (*English translation of J Jpn Coll Angiol 2013; 53: 43-47) PMID:25298827

Ohta, Takashi; Hayashi, Shogo; Yokoi, Toyoharu; Arima, Takahiro; Asamoto, Ken; Nakano, Takashi

2014-01-01

362

[Surgical treatment of the acute thrombosis of superficial veins].  

PubMed

Treatment results of 53 patients with acute thrombosis of superficial veins are presented. Carrying-out of radical one-stage cross-ectomy with combined phlebectomy in the saphena magna system at the height of inflammation period is proposed. Radical one-stage cross-ectomy with phlebectomy in case of phlebothrombosis gives good therapeutic effect, improves the status of a patient. Given treatment mode allows to reduce the period of temporary disability and rehospitalization in order to move off the trunk and inflows left after cross-ectomy. PMID:18577946

Gavrilenko, A V; Vakhrat'ian, P E; Makhambetov, B A

2008-01-01

363

Arteries and veins: making a difference with zebrafish.  

PubMed

Arteries and veins are structurally different and have long been functionally defined by the direction of blood flow that they carry. However, a growing body of evidence indicates that the identity of the endothelial cells that line these vessels is determined in the developing embryo, before circulation begins. Recent work on the zebrafish has led to the identification of signals that are responsible for arterial and venous differentiation of endothelial cells, and highlights the unique benefits of this model organism in the study of vascular development. PMID:12209142

Lawson, Nathan D; Weinstein, Brant M

2002-09-01

364

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

365

Age-Related Notch-4 Quiescence Is Associated with Altered Wall Remodeling During Vein Graft Adaptation  

PubMed Central

Background The link of aging to specific mechanisms of vascular biology is not well understood. We have previously shown that aging is associated with increased vein graft wall thickness and that this process involves the VEGF-Delta/Notch-ephrin/Eph cascade. Therefore we examined whether Dll-4 or Notch-4 are differentially expressed, according to age, during vein graft adaptation. Materials and Methods Vein grafts were performed in 6-month and 24-month Fischer 344 rats. Gene expression was analyzed by quantitative real-time PCR, and the distribution of Dll-4 and Notch-4 was observed by immunofluorescence. Results The expression of Dll-4 and Notch-4 was reduced in vein grafts performed in aged rats compared to the expression in young adult rats. Both Dll-4 and Notch-4 were distributed in vein graft endothelium as well as the outer adventitia, with reduced amounts in the outer adventitia of aged vein grafts. Aged veins had reduced eNOS membrane targeting and colocalization with caveolin-1 as well as reduced eNOS protein expression in comparison to young adult veins. In an exchange model between young and aged animals, heterogeneous vein grafts (YoAg and AgYo) showed significantly thicker neointima compared to young (YoYo) controls, and had Notch-4-positive cells, but not Dll-4-positive cells, diminished in the adventitia. Vein grafts that were air-denuded of endothelium did not show any adaptation to the arterial environment and also lacked both Dll-4 and Notch-4 expression at 3 weeks. Conclusions During vein graft adaptation to the arterial environment, both Dll-4 and Notch-4 expression are down-regulated in an aged, but not a young, background. Loss of Notch-4 is associated with loss of attenuation of neointima. The delta-Notch signaling pathway may be active during vein graft adaptation. PMID:21872265

Kondo, Yuka; Muto, Akihito; Kudo, Fabio A; Model, Lynn; Eghbalieh, Sammy; Chowdhary, Paraag; Dardik, Alan

2011-01-01

366

Congenital absence of the portal vein in a middle-aged man  

Microsoft Academic Search

Congenital absence of the portal vein with systemic diversion of mesenteric blood is extremely rare. We report a case of a\\u000a congenital absence of the portal vein, accidentally discovered in a 59-year-old man, completely asymptomatic and not associated\\u000a with other malformations or biochemical disorders. Ultrasonography imaging showed the absence of the portal vein and the distal\\u000a tract of superior mesenteric

Flavio Barchetti; Luigi Pellegrino; Najwa Al-Ansari; Valentina De Marco; Paolo Scarpato; Pasquale Ialongo

2011-01-01

367

Use of the Spiral Vein Graft as an Arterial Substitute for Secondary Access  

Microsoft Academic Search

A 30-year-old black male with end-stage renal disease of 8 years’ duration had undergone 16 prior access operations and was still without an adequate access for dialysis. A spiral saphenous vein graft conduit was constructed from the left saphenous vein and used as a straight arterial conduit graft between the superficial femoral artery at Hunter’s canal and the saphenofemoral vein

George E. Cimochowski; W. E. Rutherford; Joan Blondin; Herschel Harter

1991-01-01

368

Immunosuppression for human saphenous vein allograft bypass surgery: A prospective randomized trial  

Microsoft Academic Search

Purpose: Vein allografts are an alternative bypass conduit for patients who lack adequate autogenous vein. Animal studies have demonstrated that patency can be augmented by low-dose immunosuppression with azathioprine.Methods: In a prospective trial, 40 patients (20 men, 20 women) were randomly assigned to receive (17) or to not receive (23) azathioprine (1 mg\\/kg\\/day) after cryopreserved vein allograft bypass grafting. Patients

Jeffrey P. Carpenter; John E. Tomaszewski

1997-01-01

369

Acute posterior multifocal placoid pigment epitheliopathy with bilateral central retinal vein occlusion  

Microsoft Academic Search

PURPOSE: We examined a patient with acute posterior multifocal placoid pigment epitheliopathy and bilateral central retinal vein occlusion.METHOD: Case report. A 28-year-old woman presented with the typical findings of acute posterior multifocal placoid pigment epitheliopathy. One month after presentation, the patient developed bilateral central retinal vein occlusion.RESULT: Four months after presentation, resolution of the bilateral central retinal vein occlusion resulted

Steven D. Allee; Steven J. Marks

1998-01-01

370

Anatomical observations on the renal veins and inferior vena cava at magnetic resonance angiography  

Microsoft Academic Search

Purpose: To describe the renal vein and inferior vena cava (IVC) anatomy found at abdominal magnetic resonance (MR) angiography. Methods: Gadolinium-enhanced, three-dimensional, time-of-flight MR angiograms of 150 patients were evaluated for the number and configuration of the renal veins, and the number, configuration, and dimensions of the IVC. Data were analyzed with the Student's ttest. Results: Retroaortic left renal veins

John A. Kaufman; Arthur C. Waltman; S. Mitchell Rivitz; Stuart C. Geller

1995-01-01

371

The paracholedochal vein: a feasible option as portal inflow in living donor liver transplantation  

PubMed Central

Extensive thrombosis of the portal and splenomesenteric veins combined with cavernous transformation of the portal vein (CTPV) has been considered to be a contraindication for living donor liver transplantation (LDLT) due to technical difficulties and perioperative risks. In recent years, several surgical innovations including cavoportal hemitransposition, renoportal anastomosis, and portal arterialization have been introduced to overcome diffuse portal vein thrombosis (PVT) and CTPV, but their outcomes were unsatisfactory with significant morbidity and mortality. Herein, we report two successful cases of adult LDLT in diffuse PVT with CTPV managed using the paracholedochal vein as portal inflow to the graft. PMID:25025028

Kim, Joo Dong; Han, Young Seok

2014-01-01

372

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

373

Management of subclavian-axillary vein thrombosis: a review  

PubMed Central

Objective To study, by literature review, the management of subclavian-axillary vein thrombosis (SAVT) and to make recommendations. Data sources The MEDLINE database and cross-referenced articles. Study selection Key words subclavian-axillary vein thrombosis, venous thrombosis, Paget–Schroetter syndrome, anticoagulation, and thrombolysis were used to extract articles related to SAVT. Data extraction Independent extraction of articles by 2 observers. Data synthesis Although numerous studies are available in the literature, they vary widely in their patient selection, treatment methods, follow-up and conclusions. As such, the management of patients with SAVT remains controversial. Conclusions Anticoagulation remains the initial treatment of choice for acute SAVT although there is definitely a role for thrombolysis and surgery in selected cases. Surgical intervention should be reserved for patients in whom there is a specific indication. Since chronic symptoms depend largely on the etiology of the disease, treatment should be tailored to address the causative factors. A multicentre, prospective study is necessary to evaluate the optimum management strategies for patients with SAVT. PMID:9492744

Hicken, Gary J.; Ameli, F. Michael

1998-01-01

374

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

375

Estimates of leaf vein density are scale dependent.  

PubMed

Leaf vein density (LVD) has garnered considerable attention of late, with numerous studies linking it to the physiology, ecology, and evolution of land plants. Despite this increased attention, little consideration has been given to the effects of measurement methods on estimation of LVD. Here, we focus on the relationship between measurement methods and estimates of LVD. We examine the dependence of LVD on magnification, field of view (FOV), and image resolution. We first show that estimates of LVD increase with increasing image magnification and resolution. We then demonstrate that estimates of LVD are higher with higher variance at small FOV, approaching asymptotic values as the FOV increases. We demonstrate that these effects arise due to three primary factors: (1) the tradeoff between FOV and magnification; (2) geometric effects of lattices at small scales; and; (3) the hierarchical nature of leaf vein networks. Our results help to explain differences in previously published studies and highlight the importance of using consistent magnification and scale, when possible, when comparing LVD and other quantitative measures of venation structure across leaves. PMID:24259686

Price, Charles A; Munro, Peter R T; Weitz, Joshua S

2014-01-01

376

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

377

Plasma endothelin-1 concentrations in patients with retinal vein occlusions  

PubMed Central

AIMS—To investigate whether plasma levels of endothelin-1 (ET-1), a potent vasoconstricting peptide that is crucial in regulating retinal blood flow, were elevated in patients with retinal vein occlusion (RVO).?METHODS—ET-1 plasma concentrations were determined by radioimmunoassays in a double blind fashion in a group of 18 selected patients with RVO, in 20 healthy age matched non-smoking, normoglycaemic, normotensive control subjects, and in 15 patients with uncomplicated essential hypertension in the same age range.?RESULTS—Patients with RVO had significantly increased ET-1 plasma levels (14.22 (SD 4.6) pg/ml) compared with both normal subjects (7.90 (1.6) pg/ml; p < 0.05) and hypertensive patients (8.50 (2.9) pg/ml; p <0.05). The highest concentrations of circulating ET-1 were found in patients with RVO of the ischaemic type (16.97 (3.5) pg/ml; p < 0.01; n = 7). Systemic hypertension alone did not account for the observed increase in plasma ET-1 concentrations.?CONCLUSIONS—These findings raise the possibility that the increased circulating ET-1 levels in patients with RVO may be a marker of the occlusive event, thereby suggesting that ET-1 homeostasis may be relevant to RVO pathogenesis and retinal ischaemic manifestations.?? Keywords: endothelin-1; hypoxia; ischaemia; retinal vein occlusion; thrombogenesis; venous stasis PMID:9713055

Iannaccone, A.; Letizia, C.; Pazzaglia, S.; Vingolo, E.; Clemente, G.; Pannarale, M.

1998-01-01

378

Zero-stress states of human pulmonary arteries and veins.  

PubMed

The zero-stress states of the pulmonary arteries and veins from order 3 to order 9 were determined in six normal human lungs within 15 h postmortem. The zero-stress state of each vessel was obtained by cutting the vessel transversely into a series of short rings, then cutting each ring radially, which caused the ring to spring open into a sector. Each sector was characterized by its opening angle. The mean opening angle varied between 92 and 163 degrees in the arterial tree and between 89 and 128 degrees in the venous tree. There was a tendency for opening angles to increase as the sizes of the arteries and veins increased. We computed the residual strains based on the experimental measurements and estimated the residual stresses according to Hooke's law. We found that the inner wall of a vessel at the state in which the internal pressure, external pressure, and longitudinal stress are all zero was under compression and the outer wall was in tension, and that the magnitude of compressive stress was greater than the magnitude of tensile stress. PMID:9729559

Huang, W; Yen, R T

1998-09-01

379

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

380

The Mean Platelet Volume in Patients with Retinal Vein Occlusion  

PubMed Central

Background. The aim of this study was to investigate the mean platelet volume (MPV) of patients with retinal vein occlusion (RVO). Methods. Hundred and ninty-three patients with the diagnosis of RVO and 83 healthy control subjects were included in this retrospective study. Retinal vein occlusion was diagnosed based on clinical examination. All patients and control subjects underwent complete ocular examination. MPV, hematocrit, hemoglobin, and platelet count of the participants were recorded. The data of patients with RVO was compared with the control subjects. Results. Patients with RVO had significantly higher MPV values (8.19 ± 1.22?fL) compared with the control subjects (7.68 ± 1.11?fL) (P = 0.004). No significant difference was found in platelet counts between RVO group and the control group (275.77 ± 70.87?109/L and 261.96 ± 59.40?109/L, resp., P = 0.161), Mean platelet volume was an independent predictor of RVO (odds ratio (OR) = 1.43; 95% confidence interval (CI) = 1.09–1.89; P = 0.011). Conclusion. Our results demonstrated that the MPV values were significantly higher in patients with RVO, suggesting that larger platelets may contribute to the pathogenesis of the RVOs. PMID:23781328

Sahin, Muhammed; Yuksel, Harun; Turkcu, Fatih Mehmet; C?nar, Yasin; Cingu, Abdullah Kursat; Ar?, Seyhmus; Caca, Ihsan

2013-01-01

381

Investigation of gold-bearing veins using magnetics and TEM  

NASA Astrophysics Data System (ADS)

Gold-bearing fractures have been mined at Charters Towers, Queensland for a century. The ore occurs in quartz-sulfide veins hosted in granitoids. The gold is found in lenses within the veins. The purpose of our work was to determine if geophysical methods could be used to identify and delineate known lode-bearing veins. The study site is around the Warrior Mine immediately south of the town. Two structures are being mined at 100-300 m depth: Warrior and Sons of Freedom. While IP is typically used to locate disseminated sulfides, we used a different approach: we integrated airborne magnetic data with ground TEM data to map the geometries of the gold-bearing fracture zones. TEM is advantageous because it does not involve injection of current into the ground with the uncertainty of current flow patterns in such resistive, fractured rocks. Fixed loop TEM surveying was utilized as this approach is much faster to perform than moving loop surveys. Although TEM is commonly used for mapping layered structures and strong conductors, it is much less used for detecting weak conductors, such as those found in gold exploration, contaminant plumes, or geotechnical applications. Here the fracture zones are highly weathered and wet thus producing weak conductors. Upon mapping the vertical derivative of the RTP magnetic data, many linear anomalies were noted, including over both mined structures. These anomalies all indicate negative susceptibility, as would be expected because the structures are depleted in magnetite with respect to the granitoids. Modeling of the RTP total field and derivatives confirms a negative susceptibility. The RTP data indicate the approximate dip, which agrees with known information. Depth resolution is limited in standard 3D inversions, which utilize orthogonal grids with the normal axis in the vertical direction. In this study, we use a dipping grid which strikes and dips according to known information, and have obtained good results. TEM surveying at the Warrior site presents challenges as there is an operating mine and many other man-made features. The TEM surveys were carefully planned to minimize their impact on the response. Modeling of the TEM data indicates that the structures which include the mineralized veins are weakly conductive and are actually composed of multiple structures in close proximity. There is a strong correlation between the TEM structural interpretation and the magnetic highs, not only at the mined structures, but also over the three new structures, which are to be studied in future exploration plans including borehole TEM. The EM models were converted to magnetic models with thicknesses of 5 m and susceptibilities between -0.1 and -0.05 (SI), and the simulated magnetic response was in good agreement with the measured data. Interestingly, the rather large negative susceptibilities indicate a greater volume than can be explained by the veins alone. It is expected that this approach will be used to find potential lode-bearing structures in the Charters Towers goldfield. Areas of interest can be first identified in the magnetic data based on the RTP vertical derivative, and then TEM will be performed at these sites. We have demonstrated that, through careful modeling, TEM can be used to understand the geometry of weak conductors.

Davis, L.; Groom, R.

2012-12-01

382

CASE REPORT: Spontaneous Intrahepatic Portal—Systemic Venous Shunt in the Adult: Case Report and Review of the Literature  

Microsoft Academic Search

Intrahepatic portal–systemic venous shunt is defined as a communication between the portal and the systemic–venous circulation, measuring more than 1 mm in diameter and at least partially located inside the liver. This is a rare condition, and the etiopathogenesis is unclear. Of the various types, Type I, with patent paraumbilical veins, located in the liver, is commonly encountered in portal

Christine Pocha; Benedikt Maliakkal

2004-01-01

383

Incidence of Central Vein Stenosis and Occlusion Following Upper Extremity PICC and Port Placement  

SciTech Connect

The purpose of this study was to determine the incidence of central vein stenosis and occlusion following upper extremity placement of peripherally inserted central venous catheters(PICCs) and venous ports. One hundred fifty-four patients who underwent venography of the ipsilateral central veins prior to initial and subsequent venous access device insertion were retrospectively identified. All follow-up venograms were interpreted at the time of catheter placement by one interventional radiologist over a 5-year period and compared to the findings on initial venography. For patients with central vein abnormalities, hospital and home infusion service records and radiology reports were reviewed to determine catheter dwelltime and potential alternative etiologies of central vein stenosis or occlusion. The effect of catheter caliber and dwell time on development of central vein abnormalities was evaluated. Venography performed prior to initial catheter placement showed that 150 patients had normal central veins. Three patients had central vein stenosis, and one had central vein occlusion. Subsequent venograms (n = 154)at the time of additional venous access device placement demonstrated 8 patients with occlusions and 10 with stenoses. Three of the 18 patients with abnormal follow-up venograms were found to have potential alternative causes of central vein abnormalities. Excluding these 3 patients and the 4 patients with abnormal initial venograms, a 7% incidence of central vein stenosis or occlusion was found in patients with prior indwelling catheters and normal initial venograms. Catheter caliber showed no effect on the subsequent development of central vein abnormalities. Patients who developed new or worsened central vein stenosis or occlusion had significantly (p =0.03) longer catheter dwell times than patients without central vein abnormalities. New central vein stenosis or occlusion occurred in 7% of patients following upper arm placement of venous access devices.Patients with longer catheter dwell time were more likely to develop central vein abnormalities. In order to preserve vascular access for dialysis fistulae and grafts and adhere to Dialysis Outcomes Quality Initiative guidelines, alternative venous access sites should be considered for patients with chronic renal insufficiency and end-stage renal disease.

Gonsalves, Carin F., E-mail: Carin.Gonsalves@mail.tju.edu; Eschelman, David J.; Sullivan, Kevin L.; DuBois, Nancy; Bonn, Joseph [Jefferson MedicalCollege/Thomas Jefferson University Hospital, Suite 4200 GibbonBuilding, 111 South 11th Street, Philadelphia, PA 19107, Department of Radiology (United States)

2003-04-15

384

Shock veins in the central uplift of the Manicouagan impact structure: Context and genesis  

NASA Astrophysics Data System (ADS)

We describe the development of shock veins that penetrate the anorthositic central uplift of the Manicouagan impact structure. They occur as thin (< 2.5 mm wide), linear micro-fault systems that can be traced for several meters in length, and which predominantly trend radially from the point of impact. The shock veins are distinguished by the development of maskelynite along vein margins and stishovite in vein matrices, which are otherwise absent in non-veined regions. These phases define a shock excursion of up to 30 GPa, in contrast to bulk shock effects of ? 12 GPa defined by development of shatter cones, planar fractures and planar deformation features in various minerals. The shock veins at Manicouagan share many similarities with vein systems developed in meteorites. They also provide an in situ context with which to better understand meteoroid source and lofting conditions. In addition to containing high pressure phases, the shock veins exhibit evidence for high temperature partial melting of host silicate clasts, with the generation of flow-textured fragments and glasses. The formation of microcrystallites and dendrites from some melts indicates rapid cooling. We propose a two-stage generation mechanism comprising an initial high-pressure shock excursion (estimated to last < 0.5 s based on projectile size considerations) followed by a longer high-temperature pulse of a few seconds duration. We suggest that the shock excursion is initiated by target heterogeneities that cause distortions in the hemispherically propagating shock front. This results in radially oriented tearing and vein formation with shock amplification occurring via intra-vein shock reverberation. High-speed displacement along the veins is driven by stress release on rarefaction, which results in frictional melting via adiabatic heating.

Biren, Marc B.; Spray, John G.

2011-03-01

385

Treatment of major vein injury with the hemostatic fleece TachoSil by interposing a peritoneal patch to avoid vein thrombosis: A feasibility study in pigs  

PubMed Central

Background: Vein lacerations in awkward locations are difficult to repair and carry high mortality. The hemostatic fleece, TachoSil, is effective in preventing intraoperative bleeding in different settings, but has not been recommended for use in large vein injury. TachoSil with a peritoneal patch interposed to avoid vein thrombosis has been reported as a method to obtain hemostasis in vein laceration, but further studies of this method are needed. Materials and Methods: A 1.5 × 1 cm defect was created in the vena cava in five pigs. A 26 × 32 mm peritoneal patch was applied on the coagulant side of a 48 × 48 mm TachoSil sheet, and used to cover the defect. Light compression with a wet sponge was applied for 3 min. No vascular suturing was performed. Results: Successful hemostasis was obtained in four out of the five pigs although the minimum TachoSil gluing zone surrounding the peritoneal patch was only 0–2 mm. The fifth pig died of hemorrhage 30 min after surgery due to a 4-mm stretch with no TachoSil gluing zone outside the peritoneal patch. At six days postoperatively the peritoneal patch was well integrated into the vein wall. After 28 days, the peritoneal patch was almost indiscernible from surrounding vein endothelium. Conclusions: Vein wall defects can be repaired using TachoSil with a peritoneal patch interposed to prevent contact between the thrombogenic TachoSil sheet and the vein lumen. An adequate TachoSil gluing zone all around the patch is essential. PMID:21633573

Dregelid, Einar B; Pedersen, Gustav

2011-01-01

386

Spontaneous pancreatic pseudocyst-portal vein fistula: a rare and potentially life threatening complication of pancreatitis  

PubMed Central

Pseudocyst formation following acute and chronic pancreatitis is a well known complication. A pancreatic pseudocyst fistulating into the portal vein is a rare and potentially fatal complication. We report a case of pancreatic pseudocyst – portal vein fistula, which was managed with a conservative approach. PMID:23317711

Raza, SS; Hakeem, A; Sheridan, M

2013-01-01

387

Anomalous intracranial drainage of the nasal mucosa: a vein of the foramen caecum?  

PubMed

The existence of the vein of the foramen caecum (VFC) in humans is still controversial. We present 2 patients with intracranial drainage of the nasal mucosa by a frontal cortical vein into a superior sagittal sinus, demonstrated by digital subtraction angiography. In both, the position of the intracranial passage was found to be slightly paramedian. An analogy to the VFC is made. PMID:16418371

San Millán Ruíz, D; Gailloud, P; Rüfenacht, D A; Yilmaz, H; Fasel, J H D

2006-01-01

388

Renal vein Doppler ultrasound of maternal kidneys in normal second and third trimester pregnancy  

Microsoft Academic Search

The flow pattern in intrarenal veins depends on renal parenchymal histology and cardiac physiology. The intrarenal venous impedance index obtained by Doppler ultrasound is related to compliance in vein, and can be helpful in the assessment of renal parenchymal compliance. The purpose of this study was to determine whether normal pregnancy has a significant effect on intrarenal venous blood flow,

N Karabulut

2003-01-01

389

Does surgical correction of the superficial femoral vein valve change the course of varicose disease?  

Microsoft Academic Search

Purpose: We tested the hypothesis that the course of primary chronic venous insufficiency can be changed by correction of the incompetent valve in the superficial femoral vein. Methods: This was a prospective, randomized, controlled study. A total of 125 extremities with reflux in greater saphenous and superficial femoral veins and belonging to clinical classes C2-C4 were analyzed. During the first

Nina Petrovna Makarova; Fedor Lurie; Semen Markovich Hmelniker

2001-01-01

390

Abdominal tuberculosis—A cause of portal vein thrombosis and portal hypertension  

Microsoft Academic Search

Abdominal tuberculosis is a rare cause of portal hypertension and obstructive jaundice. We present two cases of tuberculosis with associated portal hypertension: one with segmental splenic vein occlusion caused by tuberculous lymph nodes and another with focal tuberculosis of the pancreas, causing obstructive jaundice and associated thrombosis of the portal and splenic veins. The aetiology, pathophysiology, diagnosis and management of

D. Ruttenberg; S. Graham; D. Burns; D. Solomon; P. Bornman

1991-01-01

391

Effects of sodium vanadate on the smooth muscle of the rat portal vein  

Microsoft Academic Search

The effects of vanadate on the mechanical and electrical activity of the rat portal vein were examined. Vanadate increased the height of the spontaneous contractions of the portal vein without affecting basal tension. This effect was not blocked by a-blockers or atropine. Vanadate did not exert any effect when the spontaneous contractions were abolished by high concentrations of verapamil or

K. Shimamura; S. Sunano

1988-01-01

392

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.

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

2014-01-01

393

Popliteal vein thrombosis associated with femoral osteochondroma and popliteal artery pseudoaneurysm  

Microsoft Academic Search

Deep vein thrombosis is a common condition thought to be caused by impaired venous blood flow or hypercoagulable blood states. However, often no predisposing cause can be found. We describe a deep vein thrombosis formed in association with femoral osteochondroma and popliteal artery pseudoaneurysm. It is an interesting combination that has only been described once before.

E. M. Scott; F. J. White; P. E. Jennings

1995-01-01

394

[The choice of the transplant in reconstructive surgery on the major veins of the pelvis].  

PubMed

Experimental data of topological investigation of v. saphena magna (VSM) are presented. Adequacy of venous blood outflow from lower extremity while application of VSM as a transplant was proved on the base of comparative study of iliac veins and VSM, security of application of mentioned vein for regional bloodflow was substantiated. PMID:9377260

Bezkorova?ny?, A M

1997-01-01

395

Mesenchymal stem cells can be obtained from the human saphena vein  

Microsoft Academic Search

Mesenchymal stem cells (MSC) can be isolated from many sites adults and the fetus. Cells with osteoblastic, chondrogenic, leiomiogenic and stromogenic potentials have been obtained from the bovine artery wall, and we now show that MSC can be isolated also from the adult human vein wall. Cells detached from internal surface of the saphenous vein are cultured in vitro for

Dimas T. Covas; Carlos E. Piccinato; Maristela D. Orellana; Jorge L. C. Siufi; Wilson A. Silva; Rodrigo Proto-Siqueira; Edgar G. Rizzatti; Luciano Neder; Ane R. L. Silva; Vanderson Rocha; Marco A. Zago

2005-01-01

396

Hepatic laceration because of malpositioning of the umbilical vein catheter: case report and literature review  

Microsoft Academic Search

Umbilical vein catheterization that is a common bedside procedure in the neonatal intensive care units is not without complication. The most common complications are thrombus formation, embolism, vessel perforation, hemorrhage, and infection. Complications related to the liver carry a high risk for mortality. Laceration is an ominous complication of umbilical vein catheter that is generally a result of direct injury

Murat Yi?iter; ?rfan Serdar Arda; Akgün Hiçsönmez

2008-01-01

397

Intravenous lobular capillary hemangioma occurring in the cephalic vein of a 39-year-old adult.  

PubMed

Intravenous lobular capillary hemangiomas are extremely uncommon and mostly occur in the veins of the neck and upper extremities. Here, we report the clinical and sonographic features of an intravenous lobular capillary hemangioma localized in the right cephalic vein, and we discuss its pathologic findings and differential diagnoses. PMID:24151094

Ahn, Sung Eun; Park, Ji Seon; Ryu, Kyung Nam; Jin, Wook; Park, So Young

2014-01-01

398

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

E-print Network

Email: rohan@emse.fr19 20 Keywords: Varicose veins; trans-mural pressure; Finite Element Updating between the local pressure on (the)29 soft tissues induced by wearing the compression garment and ulcers. Because experimental data on31 the mechanical properties of healthy superficial veins

Paris-Sud XI, Université de

399

Suggested treatment protocol for improving patency of femoral-infrapopliteal cryopreserved saphenous vein allografts  

Microsoft Academic Search

Purpose: Cryopreserved saphenous vein allografts are used for femoral-infrapopliteal bypass graft purposes when adequate autogenous vein is unavailable. Anticoagulation, immunosuppression therapy, or both have been suggested means for improving allograft patency. Immunosuppression has significant cost and morbidity and has produced variable results. Our successful treatment of luminal surface hypercoagulability associated with certain endovascular procedures prompted the use of an anticoagulation

C. J. Buckley; S. Abernathy; S. D. Lee; F. R. Arko; D. E. Patterson; L. G. Manning

2000-01-01

400

Treatment of a nonhealing saphenous vein harvest graft with treprostinil sodium.  

PubMed

Impaired healing of saphenous vein harvest sites is a serious but under-recognized complication of coronary artery bypass grafting surgery, particularly in the presence of peripheral arterial disease. We report the use of a continuous subcutaneous infusion of treprostinil sodium, an analog of prostacyclin, to treat a limb-threatening, nonhealing saphenous vein harvest incision site after myocardial revascularization. PMID:18355483

Zwicke, Dianne; Buggy, Brian; Lobacz, Don; Rollins, Kristan; Strootman, Deborah

2008-04-01

401

Percutaneous Manual Aspiration Embolectomy of Renal Vein Thrombosis Due to Acute Pyelonephritis  

SciTech Connect

We report the case of a 50-year-old man who presented to our institution with septic thrombosis of the renal vein which had not resolved despite several days of antibiotic therapy. Optimal restoration of renal vein flow was obtained by percutaneous manual aspiration embolectomy (PMAE) in this patient with contraindication to fibrinolytic therapy and surgery.

Novelli, Luigi, E-mail: luigi.novelli@egp.aphp.fr; Raynaud, Alain; Pellerin, Olivier; Carreres, Thierry; Sapoval, Marc [Radiologie Cardiovasculaire, HEGP (France)

2007-09-15

402

Balloon angioplasty for the the treatment of lesions in saphenous vein bypass grafts  

Microsoft Academic Search

OBJECTIVES. The purpose of this review is to assess the value and limitations of balloon angioplasty for the treatment of saphenous vein bypass graft obstructions. The potential efficacy of new interventional techniques is discussed. BACKGROUND. Treatment of ischemia due to saphenous vein bypass graft obstructions poses a difficult problem that will be encountered more often as the pool of surgically

Suylen van R-J; E. J. Topol; P. W. J. C. Serruys; Feyter de P. J; Jaegere de P

1993-01-01

403

Biomechanical response of varicose veins to elastic compression: a numerical study.  

PubMed

A patient-specific finite-element (FE) model of the human leg is developed to model the stress distribution in and around a vein wall in order to determine the biomechanical response of varicose veins to compression treatment. The aim is to investigate the relationship between the local pressure on the soft tissues induced by wearing the compression garment and the development and evolution of varicose veins and various skin-related diseases such as varicose veins and ulcers. Because experimental data on the mechanical properties of healthy superficial veins and varicose veins are scarce in literature, ultrasound images of in vivo varicose veins are acquired and analysed to extract the material constants using Finite Element Model Updating. The decrease in trans-mural pressure, which conditions the effectiveness of compressive treatments, is computed from the simulation results. This constitutes the original added value of the developed model as decrease in trans-mural pressures cannot be assessed experimentally by any other means. Results show that external compression is effective in decreasing the trans-mural pressure, thereby having a positive effect in the control and treatment of vein-related diseases. PMID:23178041

Rohan, C P-Y; Badel, P; Lun, B; Rastel, D; Avril, S

2013-02-01

404

The risk factors affecting the complications of saphenous vein graft harvesting in aortocoronary bypass surgery  

Microsoft Academic Search

Objective: Problem of wound healing is commonly observed after coronary artery bypass graft procedures. Our aim is to determine the prevalence and the predictors of saphenous vein harvesting complication after coronary revascularization procedures. Methods: After institutional ethical committee review and approval, a retrospective review was undertaken of 4029 bypass procedures with saphenous vein graft performed over a period of six

Monir ABBASZADEH; MK ARABNIA; A. RABBANI; S. VAHEDI

405

Superselective ophthalmic artery fibrinolytic therapy for the treatment of central retinal vein occlusion  

Microsoft Academic Search

AIMTo study the effect of superselective ophthalmic artery fibrinolysis as a treatment for central retinal vein occlusion (CRVO).METHODSRetrospective, university based single centre study. The charts of 26 eyes of 26 patients treated were reviewed. Among the 26 patients, there were nine cases of combined artery and vein occlusion, three cases of combined cilioretinal artery and CRVO, and 14 cases of

M Paques; J N Vallée; D Herbreteau; A Aymart; P Y Santiago; F Campinchi-Tardy; D Payen; J J Merlan; A Gaudric; P Massin

2000-01-01

406

Ranibizumab for Macular Edema Due to Retinal Vein Occlusions: Implication of VEGF as a Critical Stimulator  

Microsoft Academic Search

Macular edema is a major cause of vision loss in patients with central retinal vein occlusion (CRVO) or branch retinal vein occlusion (BRVO). It is not clear how much of the edema is due to hydrodynamic changes from the obstruction and how much is due to chemical mediators. Patients with macular edema due to CRVO (n = 20) or BRVO

Peter A Campochiaro; Gulnar Hafiz; Syed Mahmood Shah; Quan Dong Nguyen; Howard Ying; Diana V Do; Edward Quinlan; Ingrid Zimmer-Galler; Julia A Haller; Sharon D Solomon; Jennifer U Sung; Yasmin Hadi; Kashif A Janjua; Nida Jawed; David F Choy; Joseph R Arron

2008-01-01

407

A prospective study of xenon arc photocoagulation for central retinal vein occlusion  

Microsoft Academic Search

Twenty patients with central retinal vein occlusion were randomly divided into two groups in a prospective study to evaluate the effects of xenon are photocoagulation in central retinal vein occlusion. The patients in one group were treated with 360 degrees scatter xenon photocoagulation and the others received no treatment. The average follow-up was 18 months. There were no cases of

D R May; M L Klein; G A Peyman

1976-01-01

408

Activated Protein C Resistance, Factor V Leiden, and Central Retinal Vein Occlusion in Young Adults  

Microsoft Academic Search

Objective: To confirm the relationship between resistance to activated protein C (APC), factor V Leiden, and central retinal vein occlusion in young adults as reported in a recent study of patients younger than 50 years. Patients and Methods: Patients younger than 50 years with central retinal vein occlusion were identified from the medical records of the Wills Eye Hospital Retina

Justin L. Gottlieb; Jeffrey P. Blice; Bernadette Mestichelli; Barbara A. Konkle; William E. Benson

409

Viscoelastic evaluation of fetal umbilical vein for reconstruction of middle cerebral artery.  

PubMed

The transplantation of artificial blood vessels with < 6 mm inner diameter as substitutes for human arterioles or veins has not achieved satisfactory results. Umbilical vein has been substituted for ar-tery in vascular transplantation, but it remains unclear whether the stress relaxation and creep tween these vessels are consistent. In this study, we used the fetal umbilical vein and middle cere-bral artery from adult male cadavers to make specimens 15 mm in length, 0.196-0.268 mm in nica media thickness, and 2.82-2.96 mm in outer diameter. The results demonstrated that the stress decrease at 7 200 seconds was similar between the middle cerebral artery and fetal umbilical vein specimens, regardless of initial stress of 18.7 kPa or 22.5 kPa. However, the strain increase at 7 200 seconds of fetal umbilical veins was larger than that of middle cerebral arteries. Moreover, the stress relaxation experiment showed that the stress decrease at 7 200 seconds of the fetal umbilical vein and middle cerebral artery specimens under 22.5 kPa initial stress was less than the decrease in these specimens under 18.7 kPa initial stress. These results indicate that the fetal umbilical vein has appropriate stress relaxation and creep properties for transplantation. These properties are advantageous for vascular reconstruction, indicating that the fetal umbilical vein can be transplanted to repair middle cerebral artery injury. PMID:25206626

Li, Dongyuan; Xu, Donghui; Li, Peng; Wei, Jun; Yang, Kun; Zhao, Conghai

2013-11-15

410

Geometric Analysis of Vein Fracture Networks From the Awibengkok Core, Indonesia  

NASA Astrophysics Data System (ADS)

Fracture network systems within rocks are important features for the transportation and remediation of hazardous waste, oil and gas production, geothermal energy extraction and the formation of vein fillings and ore deposits. A variety of methods, including computational and laboratory modeling have been employed to further understand the dynamic nature of fractures and fracture systems (e.g. Ebel and Brown, this session). To substantiate these studies, it is also necessary to analyze the characteristics and morphology of naturally occurring vein systems. The Awibengkok core from a geothermal system in West Java, Indonesia provided an excellent opportunity to study geometric and petrologic characteristics of vein systems in volcanic rock. Vein minerals included chlorite, calcite, quartz, zeolites and sulphides. To obtain geometric data on the veins, we employed a neural net image processing technique to analyze high-resolution digital photography of the veins. We trained a neural net processor to map the extent of the vein using RGB pixel training classes. The resulting classification image was then converted to a binary image file and processed through a MatLab program that we designed to calculate vein geometric statistics, including aperture and roughness. We also performed detailed petrographic and microscopic geometric analysis on the veins to determine the history of mineralization and fracturing. We found that multi-phase mineralization due to chemical dissolution and re-precipitation as well as mechanical fracturing was a common feature in many of the veins and that it had a significant role for interpreting vein tortuosity and history of permeability. We used our micro- and macro-scale observations to construct four hypothetical permeability models that compliment the numerical and laboratory modeled data reported by Ebel and Brown. In each model, permeability changes, and in most cases fluctuates, differently over time as the tortuosity and aperture of veins are affected by the precipitation, dissolution, and re-precipitation of minerals, and also by mechanical fracturing. In all of our cases we interpret a first-phase mineral dissolution stage where permeability gradually declines as the vein is blocked by inward growing minerals. Hereafter, permeability may briefly increase with the onset of internal fracturing within the vein or by a phase of mineral dissolution opening up new pathways for fluid flow. Eventually we infer that permeability will decline again as second stage minerals are deposited in the fluid flow pathways.

Khatwa, A.; Bruhn, R. L.; Brown, S. R.

2003-12-01

411

[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

412

Obstruction of the superior vena cava or subclavian veins: Sonographic diagnosis  

SciTech Connect

The normal subclavian vein shows a respiratory rhythmicity on sonograms and responds to a sudden sniff maneuver by collapsing in a rapid, transient manner secondary to the sudden decrease in intrathoracic pressure. Of 11 patients studied using ultrasound (US) for possible superior vena cava (SVC) obstruction, five patients with proved SVC obstruction had no response of the enlarged subclavian veins to respiratory maneuvers. One patient with a partial obstruction had a minimal response on one side. Two patients with isolated subclavian vein obstructions had no response on the affected side and a normal response on the contralateral side. Three patients proved not to have SVC obstruction had normal responses. Sonography of the subclavian veins may be an effective, indirect screening technique for the presence of SVC obstruction and can also be used to evaluate the patency of the subclavian vein, although the the sensitivity and specificity of the method remain to be determined from a larger, prospective study.

Gooding, G.A.W.; Hightower, D.R.; Moore, E.H.; Dillon, W.P.; Lipton, M.J.

1986-06-01

413

Effective Endovascular Stenting of Malignant Portal Vein Obstruction in Pancreatic Cancer  

PubMed Central

We report herein the case of a patient successfully treated by transhepatic portal venous stent placement for malignant portal vein obstruction with associated gastric and small bowel varices and repeated gastrointestinal bleeding. CT angiography and portography showed severe portal vein obstruction from recurrent pancreatic cancer 15 months following pancreaticoduodenectomy with tumor encasement and dilated collateral veins throughout the gastric and proximal small bowel wall as the suspected cause of the GI bleeding. Successful transhepatic endovascular stent placement of the splenic vein at the portal vein confluence followed by balloon dilation was performed with immediate decompression of the gastric and small bowel varices and relief of GI hemorrhage in this patient until his death four months later. The treatment for patients with this dilemma can prove to be difficult, but as we have shown endovascular stenting of the portal system is an effective treatment option. PMID:19826629

Ellis, Christian M.; Shenoy, Sadashiv; Litwin, Alan; Soehnlein, Stephanie; Gibbs, John F.

2009-01-01

414

Pulmonary vein myocardium as a possible pharmacological target for the treatment of atrial fibrillation.  

PubMed

The pulmonary vein has a unique electrophysiological property showing an autonomic electrical activity, and this phenomenon has been further focused on as a source of triggers of atrial fibrillation. The pulmonary vein cardiomyocytes have shorter action potential duration, less negative resting membrane potential, and smaller maximum upstroke velocity than those in the left atrium, whose underlying cellular mechanisms may generate arrhythmogenic substrates such as abnormal automaticity and triggered activity. In diseased conditions including sustained atrial tachycardia or chronic volume overload, its arrhythmogenic profile can be further modified through abbreviation of action potential duration of the pulmonary vein myocardium, which may become a cause of reentry. Recently, antiarrhythmic effects of various drugs have been extensively investigated in isolated pulmonary vein preparations. The present review article highlights the recent advances in our understanding of electrophysiological and pharmacological profiles of the pulmonary vein. PMID:25242082

Takahara, Akira; Hagiwara, Mihoko; Namekata, Iyuki; Tanaka, Hikaru

2014-09-20

415

Control of Leaf and Vein Development by Auxin  

PubMed Central

Leaves are the main photosynthetic organs of vascular plants and show considerable diversity in their geometries, ranging from simple spoonlike forms to complex shapes with individual leaflets, as in compound leaves. Leaf vascular tissues, which act as conduits of both nutrients and signaling information, are organized in networks of different architectures that usually mirror the surrounding leaf shape. Understanding the processes that endow leaves and vein networks with ordered and closely aligned shapes has captured the attention of biologists and mathematicians since antiquity. Recent work has suggested that the growth regulator auxin has a key role in both initiation and elaboration of final morphology of both leaves and vascular networks. A key feature of auxin action is the existence of feedback loops through which auxin regulates its own transport. These feedbacks may facilitate the iterative generation of basic modules that underlies morphogenesis of both leaves and vasculature. PMID:20182604

Scarpella, Enrico; Barkoulas, Michalis; Tsiantis, Miltos

2010-01-01

416

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

417

Anomalous external jugular vein: clinical concerns in treating clavicle fractures.  

PubMed

Operative treatment of clavicle fractures has seen growing acceptance, as evidence emerges to support its use over nonoperative management. Of particular popularity, more recently, is the percutaneous intramedullary techniques for fixation of these injuries. The complex neurovascular anatomy in close proximity to the clavicle requires precision with these procedures. Anatomic variations in this region pose an even greater, and often unforeseen, danger to the operating surgeon and patient. Here, we present a case report of an anomalous external jugular vein coursing anterior to the clavicle that was encountered during an open surgical approach to a clavicle fracture. The purpose of this case presentation is to serve as a caution to surgeons treating clavicle fractures by both open and percutaneous means. Inadvertent injury to anomalous neurovascular structures can be devastating to the patient and can be avoided by the careful surgical approaches recommended. PMID:20490525

Reinhardt, Keith R; Kim, Han Jo; Lorich, Dean G

2011-01-01

418

Portal Vein Embolization: Rationale, Technique, and Current Application  

PubMed Central

Portal vein embolization (PVE) is a technique used before hepatic resection to increase the size of liver segments that will remain after surgery. This therapy redirects portal blood to segments of the future liver remnant (FLR), resulting in hypertrophy. PVE is indicated when the FLR is either too small to support essential function or marginal in size and associated with a complicated postoperative course. When appropriately applied, PVE has been shown to reduce postoperative morbidity and increase the number of patients eligible for curative intent resection. PVE is also being combined with other therapies in novel ways to improve surgical outcomes. This article reviews the rationale, technical considerations, and current use of preoperative PVE. PMID:23729977

May, Benjamin J.; Madoff, David C.

2012-01-01

419

Portal vein thrombosis: Insight into physiopathology, diagnosis, and treatment  

PubMed Central

Portal vein thrombosis (PVT) is a relatively common complication in patients with liver cirrhosis, but might also occur in absence of an overt liver disease. Several causes, either local or systemic, might play an important role in PVT pathogenesis. Frequently, more than one risk factor could be identified; however, occasionally no single factor is discernable. Clinical examination, laboratory investigations, and imaging are helpful to provide a quick diagnosis, as prompt treatment might greatly affect a patient’s outcome. In this review, we analyze the physiopathological mechanisms of PVT development, together with the hemodynamic and functional alterations related to this condition. Moreover, we describe the principal factors most frequently involved in PVT development and the recent knowledge concerning diagnostic and therapeutic procedures. Finally, we analyze the implications of PVT in the setting of liver transplantation and its possible influence on patients’ future prognoses. PMID:20066733

Ponziani, Francesca R; Zocco, Maria A; Campanale, Chiara; Rinninella, Emanuele; Tortora, Annalisa; Maurizio, Luca Di; Bombardieri, Giuseppe; Cristofaro, Raimondo De; Gaetano, Anna M De; Landolfi, Raffaele; Gasbarrini, Antonio

2010-01-01

420

Cerebral vein thrombosis after coronary artery bypass surgery.  

PubMed

A case of cerebral vein thrombosis after cardiac artery bypass grafting is presented in a patient with coronary artery disease and prolonged angina. Postoperatively he failed the weaning trials because of brain dysfunction characterized by confusion, agitation and hyperpnea. He was initially considered to represent a typical case of post cardiac surgery brain underperfusion, but as he later developed persistent signs of endocranial hypertension, imaging of the brain vessels was carried out revealing obstruction of the left transverse and the frontal half of the oblique sinus. The patient was treated with anticoagulation and cerebrospinal fluid drainage through a lumbo-peritoneal shunt. He was discharged from the ICU in good condition after 102 days of hospitalization. As magnetic resonance imaging of the brain is generally recommended in cases with post cardiac surgery brain dysfunction with normal computed tomography scan, adding magnetic resonance phlebography to the examination protocol seems rational. PMID:17669923

Zervakis, Dimitrios; Angelidakis, Panagiotis; Dedeilias, Panagiotis; Koutsoukou, Antonia

2007-08-01

421

Deep vein thrombosis in the disabled pediatric population.  

PubMed

The incidence of deep vein thrombosis (DVT) in the disabled pediatric population has rarely been studied. The purpose of our retrospective study was to define the incidence in patients younger than 18 years of age who were in a rehabilitation center. We reviewed the charts of 532 children admitted to the center from 1983 through 1987, and found a 2.2% overall incidence of DVT. The largest group of children under 18 of age with documented or suspected DVT was the group with spinal cord injuries (SCI). There were 87 SCI children, 67 of whom were between the ages of 15 and 18. Of the 67, 7 (10%) had DVT: 1 of the 20 SCI children under age 15 had DVT. There were single cases of DVT documented in children with: meningoencephalitis, arteriovenous malformation, closed head injuries, and Guillian-Barré syndrome. We studied the risk involved in treating DVT with heparin and formulated recommendations based on our findings. PMID:8129573

Radecki, R T; Gaebler-Spira, D

1994-03-01

422

Unknown bile ductuli accompanying hepatic vein tributaries (experimental study).  

PubMed

Studying Ductular reaction (DR) at early stages after common bile duct ligation (CBDL) in rats we revealed some ductular profiles (DPs) of unusual location - accompanying different caliber tributaries of hepatic veins (THV) including central and sub-lobular venules. We investigated the essence and genesis of these atypically located ductuli. 28 Wistar Rat livers were studied histologically and immunohistochemically in norm and after 6, 12 and 24 hours of CBDL. Biliary system of part of the animals was preliminary injected by Indian Ink. After CBDL the number of DPs including the ones accompanying large and small THV was increased. The diameters of DPs found immediately at central and sublobular veins were varying from 5 to 15 m?µ and of DPs located in the adventitia of the large THV are varying from 10 to 30 m?µ. The cell of these DPs were CK19, CK7 and OV6 positive, but Ki-67 negative, what confirms their belonging to cholangiocytes but denies their proliferative genesis. In the sites of crossing of different size portal tracts (PT) and THV with integration of their connective tissue sheaths were revealed some biliary ducts/ductules dislocated from PT towards the THV and situated within their adventitia. The Indian Ink injected via CBD was found in both - portal and perivenous DPs as well as in bile canaliculi, what confirms their inter-continuity. The biliary ductules dislocated from PT toward THV may accompany hepatic venous pathways reversely up to central venules. These finest ductuli having spare function are likely to communicate with bile canaliculi. PMID:25341252

Kordzaia, D; Jangavadze, M

2014-09-01

423

Anticoagulant therapy for deep vein thrombosis (DVT) in pregnancy  

PubMed Central

Background Thromboembolic complications are much higher in pregnancy due to procoagulant changes. Heparin does not cross the placenta and the use of unfractionated heparin (UFH) is the current established practice in prophylaxis and treatment for thromboembolism in pregnancy. Objectives To compare the effectiveness of anticoagulant therapies for the treatment of deep vein thrombosis in pregnancy. The anticoagulant drugs included are UFH, low molecular weight heparin (LMWH) and warfarin. Search methods We searched the Cochrane Pregnancy and Childbirth Group’s Trials Register (March 2010) and reference lists of retrieved studies. Selection criteria Randomised controlled trials comparing any combination of warfarin, UFH, LMWH and placebo in pregnant women. Data collection and analysis We used methods described in the Cochrane Handbooks for Systemic Reviews of Interventions for assessing the eligibility of studies identified by the search strategy. A minimum of two review authors independently assessed each study. Main results We did not identify any eligible studies for inclusion in the review. We identified three potential studies; after assessing eligibility, we excluded all three as they did not meet the prespecified inclusion criteria. One study compared LMWH and UFH in pregnant women with previous thromboembolic events and, for most of these women, anticoagulants were used as thromboprophylaxis. There were only three women who had a thromboembolic event during the current pregnancy and it was unclear whether the anticoagulant was used as therapy or prophylaxis. We excluded one study because it included only women undergoing caesarean birth. The third study was not a randomised trial. Authors’ conclusions There is no evidence from randomised controlled trials on the effectiveness of anticoagulation for deep vein thrombosis in pregnancy. Further studies are required. PMID:20556784

Yaakob, Che Anuar Che; Dzarr, Abdulla Abu; Ismail, Ahmad Amir; Lah, Nik Ahmad Zuky Nik; Ho, Jacqueline J

2014-01-01

424

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

425

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

426

Experimental study on enhancement of the metastatic potential of portal vein tumor thrombus-originated hepatocellular carcinoma cells using portal vein serum  

PubMed Central

Objective Portal vein metastasis of hepatocellular carcinoma (HCC) results in a poor prognosis and seriously affects the survival rate of patients. The mechanism underlying the formation of portal vein tumor thrombus (PVTT) is complex and is not yet fully understood. This study was conducted to investigate the impact of portal vein blood on the proliferation, metastasis, invasion and apoptosis of PVTT cells and to explore its possible mechanisms, which was expected to lay a foundation for ascertaining the mechanism underlying the portal vein metastasis of HCC. Methods Peripheral blood and portal vein blood were collected from patients with HCC, and the sera from these two sources were used to culture the PVTT-originated HCC cell line CSQT-2. The cells were collected after 24 h, and flow cytometry was performed to detect cell proliferation, cell cycle stages and apoptosis. Transwell migration and invasion assays were applied to detect the metastasis and invasion of the cells in each group. The changes in the expression of MMP-2 and MMP-9 in cells were detected via Western blotting. The contents of IL-12, IFN-?, IL-1?, IL-2 and TNF-? in the two groups of sera were quantified using corresponding kits. Results Compared with the group of cells cultured with peripheral serum, the cells cultured with portal vein serum showed significantly lower apoptosis (P<0.01), significantly enhanced cell metastasis and invasion (P<0.01), whereas cell proliferation and the stages of the cell cycle did not differ significantly (P>0.05). A significantly increased expression level of MMP-2 has been observed in tumor cells treated portal vein serum. In addition, compared with peripheral serum, the content of IL-12 was significantly decreased in portal vein serum (P<0.05), while the contents of IFN-?, IL-1?, IL-2, and TNF-? did not differ significantly (P>0.05). Conclusions Portal vein serum from HCC patients could inhibit the apoptosis of PVTT-originated HCC cells and promote cell metastasis and invasion. This effect may be related to the lower level of IL-12 in portal vein serum.

Tang, Yufu; Yu, Hongming; Zhang, Long; Wang, Kang; Guo, Weixing; Shi, Jie; Liu, Shupeng; Wu, Mengchao; Wang, Hongyang

2014-01-01

427

The use of arm vein in lower-extremity revascularization: Results of 520 procedures performed in eight years  

Microsoft Academic Search

Purpose: The absence of an adequate ipsilateral saphenous vein in patients requiring lower-extremity revascularization poses a difficult clinical dilemma. This study examined the results of the use of autogenous arm vein bypass grafts in these patients. Methods: Five hundred twenty lower-extremity revascularization procedures performed between 1990 and 1998 were followed prospectively with a computerized vascular registry. The arm vein conduit

Peter L. Faries; Subodh Arora; Frank B. Pomposelli; Michele C. Pulling; Paula Smakowski; Darren I. Rohan; Gary W. Gibbons; Cameron M. Akbari; David R. Campbell; Frank W. LoGerfo

2000-01-01

428

Use of arm and lesser saphenous vein compared with prosthetic grafts for infrapopliteal arterial bypass: Are they worth the effort?  

Microsoft Academic Search

Purpose: Arm and lesser saphenous veins (ALSVs) are generally considered to be the best alternative for infrapopliteal arterial bypass grafts when greater saphenous vein is not available. The need for additional incisions and repositioning of the patient, along with occasional use of general anesthesia for arm vein harvesting, led to our perception that the use of ALSVs increased operative time

Keith D. Calligaro; Jennifer R. Syrek; Matthew J. Dougherty; Ignacio Rua; Carol A. Raviola; Dominic A. DeLaurentis

1997-01-01

429

Anatomy of the veins of the dorsum pedis with regard to their suitability as vascular grafts in reconstructive microsurgery  

Microsoft Academic Search

Attempts to locate veins suitable as micro-surgical vascular grafts were carried out in 16 preparations of the subcutaneous venous network of the dorsum pedis. For this reason the length, diameter, valve distances and frequency of longitudinal veins were especially examined. Four types of veins were defined as being suitable for transplantation and it was established that they are situated in

P. Wyss; P. C. Butz; St. Kubik

1986-01-01

430

Traumatic injuries of the portal vein. The role of acute ligation.  

PubMed Central

Injuries to the portal vein are rare but have a high risk with a mortality of 50--70% secondary to exsanguinating hemorrhage. When managing injuries to the portal vein, lateral venorrhaphy, end to end anastomosis, or an interposition graft should be attempted whenever possible. However, in a hemodynamically unstable patient or when confronted with a nonreconstructable injury, acute portal vein ligation may be the procedure of choice as it is safely tolerated in some 80% of patients. Of eleven reported patients in whom the portal vein was ligated acutely for traumatic injury, six survived. Four of the nonsurvivors died of massive associated injuries. Of the six surviving patients, five tolerated acute ligation of the portal vein without complication. Should portal vein ligation be performed a "second look" operation is essential in 24 hours to examine the bowel for viability. A portosystemic shunt with its inherent complications should not be done as a primary procedure when attempts at reconstruction of the portal vein have failed. Shunting should be reserved for those few patients who develop stigmata of portal hypertension or impending infarction of the bowel. PMID:443892

Pachter, H L; Drager, S; Godfrey, N; LeFleur, R

1979-01-01

431

Categorizing the distribution of the saphenous nerve in relation to the great saphenous vein.  

PubMed

Saphenous donor site neuralgia is a cause of morbidity post-coronary artery bypass surgery. Saphenous nerve damage during harvesting of the great saphenous vein is thought to be responsible. We dissected 37 cadaveric lower limbs from the knee fold to the dorsal venous arches, to study the spatial relations of the saphenous nerve and great saphenous vein to identify its distribution within the leg. Distribution of the saphenous nerve was categorized into Type A, where the nerve traveled inferiorly and split into an anterior and posterior branch during its course between the knee fold and medial malleolus, Type B, where the nerve traveled anterior to the vein with a small caliber branch traveling posteriorly at the proximal end, Type C where two main branches originated at the knee fold, one anterior to and one posterior to the vein. Overall the vein and nerve crossed in 27 out of the 37 cases (73%), occurring between 5 and 29 cm from the malleolus (60% occurred between 16 and 26 cm). In 32 (86%) of cases, the distal part of the nerve and vein were tightly adhered to each other within a common sheath. The length of adherence ranged from 3 to 26 cm with an average of 14 cm. The saphenous nerve is highly vulnerable during harvesting of the great saphenous vein due to its close relationship and crossing branches. Knowledge of the distribution categories of the nerve can help guide the surgeon to avoid damaging nerve branches during harvesting. PMID:22997057

Wilmot, V V; Evans, D J R

2013-05-01

432

Immunomodulation of vascular endothelium: Effects of ultraviolet B irradiation on vein allograft rejection  

SciTech Connect

Prosthetic grafts of vein allografts are inadequate as small-diameter vessel substitutes. We have applied ultraviolet B (UVB) irradiation to modulate the immunogenicity of vein allografts to avoid immunologic injury. The veins of male ACI rats were irradiated with UVB (60 mJ/cm2) in situ and transplanted to male ACI rats (autografts) and female Lewis rats (allografts). Nonirradiated veins served as controls. At 4, 7, 14, and 28 days, all grafts were patent and were studied for morphologic changes by scanning electron microscopy and for immunogold labeling of major histocompatibility complex class II antigen expression. In autografts, scanning electron microscopy demonstrated minimal endothelial loss after grafting, regardless of UVB irradiation. Untreated allografts showed severe endothelial injury 4, 7, and 14 days after transplantation. UVB irradiation of veins protected allografts from injury to the endothelium and basement membrane. Major histocompatibility complex class II-positive endothelial cells were not seen in autografts but were seen in 40% of cells 4 days after transplantation in untreated allografts. UVB-treated allografts showed MHC class II antigen expression labeling of 20% of the endothelial cells. Barr body analysis demonstrated the donor origin of these endothelial cells. UVB irradiation of rat vein allografts prolongs endothelial survival while decreasing endothelial surface expression of class II antigens. These data suggest that modification of vein immunogenicity with UVB irradiation may permit functional survival of small-vessel allografts without chronic immunosuppression.

Marin, M.L.; Hardy, M.A.; Gordon, R.E.; Reemtsma, K.; Benvenisty, A.I. (Columbia Univ. College of Physicians and Surgeons, New York, NY (USA))

1990-01-01

433

Minimally invasive, endovenous laser treatment of varicose veins in patients with von Willebrand disease.  

PubMed

The presented report presents a minimally invasive approach for the treatment of varicose veins in patients with chronic venous disease and coexisting von Willebrand disease, the most common inherited bleeding disorder. Conventional stripping of an insufficient great saphenous vein and varicose vein surgery, carries a potential risk of serious bleeding complications in this specific group of patients. It is related to the extent of open surgery, significant tissue trauma, and possible post-operative bleeding of wounds. Less aggressive techniques, such as endovenous laser treatment or radiofrequency ablation, gain increasing popularity as a valuable and equally efficient alternative to conventional surgery in patients with varicose veins. Both of these endovenous techniques seem to have special indications in patients with bleeding disorders. Shortening of hospitalization, quick recovery time and return to normal daily activities, optimal cosmetic effect of the procedure, are also advantageous. The paper presents the technique and results of endovenous laser treatment of great saphenous vein insufficiency and varicose veins in a patient with type I von Willebrand disease. Available data on peri-operative care standards, optimization of the safety of procedures, and prevention of bleeding complications in surgical patients with von Willebrand disease, specifically undergoing varicose veins surgery are analysed. PMID:24364473

Terlecki, Piotr; Zubilewicz, Tomasz; Przywara, Stanis?aw; I??ecki, Marek; Karaku?a, Wac?aw; Hus, Marek; Nowaczy?ska, Aleksandra; Kuczy?ski, Maciej

2013-01-01

434

Intraosseous Venography with Carbon Dioxide in Percutaneous Vertebroplasty: Carbon Dioxide Retention in Renal Veins  

SciTech Connect

The objective of the present study was to determine the frequency of gas retention in the renal vein following carbon dioxide intraosseous venography in the prone position and, while citing references, to examine its onset mechanisms. All percutaneous vertebroplasties performed at our hospital from January to December 2005 were registered and retrospectively analyzed. Of 43 registered procedures treating 79 vertebrae, 28 procedures treating 54 vertebrae were analyzed. Vertebral intraosseous venography was performed using carbon dioxide as a contrast agent in all percutaneous vertebroplasty procedures. In preoperative and postoperative vertebral CT, gas retention in the renal vein and other areas was assessed. Preoperative CT did not show gas retention (0/28 procedures; 0%). Postoperative CT confirmed gas retention in the renal vein in 10 of the 28 procedures (35.7%). Gas retention was seen in the right renal vein in 8 procedures (28.6%), in the left renal vein in 5 procedures (17.9%), in the left and right renal veins in 3 procedures (10.7%), in vertebrae in 22 procedures (78.6%), in the soft tissue around vertebrae in 14 procedures (50.0%), in the spinal canal in 12 procedures (42.9%), and in the subcutaneous tissue in 5 procedures (17.9%). In conclusion, in our study, carbon dioxide gas injected into the vertebra frequently reached and remained in the renal vein.

Komemushi, Atsushi, E-mail: kome64@yo.rim.or.jp; Tanigawa, Noboru; Kariya, Shuji; Kojima, Hiroyuki; Shomura, Yuzo; Tokuda, Takanori; Nomura, Motoo; Terada, Jiro; Kamata, Minoru; Sawada, Satoshi [Kansai Medical University, Department of Radiology (Japan)

2008-11-15

435

Successful treatment of posttraumatic phlegmasia cerulea dolens by reconstructing the external iliac vein: a case report  

PubMed Central

Introduction Phlegmasia cerulea dolens is a rare condition caused by complete venous occlusion leading to impaired arterial flow. To prevent progression to limb gangrene, prompt diagnosis and treatment initiation are paramount. Here we report a rare case of posttraumatic phlegmasia cerulea dolens after ligation of the iliac vein to save the patient's life, with successful treatment by reconstructing the e