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Results 351 - 400 of 1017
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Ichinose Akihiro - - 2004
Whether or not multiple venous anastomoses reduce the risk of free-flap failure is a subject of controversy. We report here, for the first time, on the importance of selecting 2 separate venous systems of the flap for dual anastomoses. The efficacy of multiple anastomoses was verified through a retrospective review ...
Duroure F - - 2004
Lip amputations are rare, and microsurgical replantation must be systematically tried to restore form and function in one step. The authors present a series of three cases. Revascularization of the amputated segment was obtained by arterial anastomosis with the corresponding labial coronary artery. No venous anastomosis was carried out, because ...
Kwei Stephanie - - 2004
Venous arterialization occurs when a vein segment is transposed as a bypass graft into the arterial circulation, resulting in a structural and functional reorganization of the vascular wall in response to the new local biomechanical environment. Although the anatomical changes of venous arterialization have been well characterized, the molecular mechanisms ...
le Noble Ferdinand - - 2004
Formation of the yolk sac vascular system and its connection to the embryonic circulation is crucial for embryo survival in both mammals and birds. Most mice with mutations in genes involved in vascular development die because of a failure to establish this circulatory loop. Surprisingly, formation of yolk sac arteries ...
Linkins Lori-Ann - - 2003
The limitations of heparin and warfarin have prompted the search for new anticoagulants for the prevention and treatment of venous and arterial thromboembolism. Although many such agents are in development, only a few have reached phase II or higher levels of clinical testing. This article reviews venous and arterial thrombogenesis, ...
Linkins Lori-Ann - - 2003
A variety of new anticoagulants for the prevention and treatment of venous and arterial thromboembolism are under development. Designed to overcome the limitations of heparin and vitamin K antagonists, these new agents are at various stages of clinical testing. This paper reviews venous and arterial thrombogenesis, discusses the regulation of ...
Kahle B - - 2003
The ratio of volume flow in the common femoral vein and artery denoted as venous-arterial Flowindex (VAFI) is significantly increased in venous insufficiency according the clinical grade of the disease. This study was done to investigate the reliability and reproducibility of VAFI as quantitative pattern. In 43 patients with varicose ...
Makariou Erini - - 2003
Venous anomalies are rarely seen with cystic hygromas. We describe an unusual case of cystic hygroma of the neck associated with a saccular venous aneurysm that was increasing in size. A multi-modality examination of the neck-including CT, Doppler sonography, and MR imaging-revealed multiloculated cystic lesions bilaterally with predominance on the ...
Min Robert J - - 2003
Physicians unfamiliar with venous insufficiency, particularly disorders of the superficial venous system, often underestimate the complexity of the problem and the importance of proper evaluation before initiating treatment. In addition to a directed history evaluation and physical examination, additional evaluation with use of a variety of noninvasive diagnostic instruments, including ...
van Bemmel Cornelis M - - 2003
Blood pool agents (BPAs) for contrast-enhanced (CE) magnetic-resonance angiography (MRA) allow prolonged imaging times for higher contrast and resolution. Imaging is performed during the steady state when the contrast agent is distributed through the complete vascular system. However, simultaneous venous and arterial enhancement in this steady state hampers interpretation. In ...
Torres-Vázquez Jesús - - 2003
The vertebrate vascular system is essential for the delivery and exchange of gases, hormones, metabolic wastes and immunity factors. These essential functions are carried out in large part by two types of anatomically distinct blood vessels, namely arteries and veins. Previously, circulatory dynamics were thought to play a major role ...
Ray Joel G - - 2003
The optimal drug for the prevention of venous thromboembolism is one that is efficacious, associated with minimal bleeding risk, and easy to administer. Statins fulfill the latter two criteria, but their efficacy remains unproved. By examining the association between dyslipidemia and venous thromboembolism, as well as the evidence that statins ...
Khilnani Neil M - - 2003
The most important part of effectively treating a patient with superficial venous insufficiency is making an accurate diagnosis of its cause and creating a map of the incompetent pathways. A history and physical examination can provide a great deal of information; however, a duplex ultrasound examination can definitively identify the ...
Gonsalves Carin F - - 2003
In 1837, Piorry, a French professor of medicine stated, "It is rather difficult to understand why the investigation of veins has been passed over almost in silence, while such a great diagnostic value has been attached to the investigation of arteries." Even today, our understanding of venous disease pales in ...
Chu Yuan-Chih - - 2003
BACKGROUND AND PURPOSE: Arterial blood gas (ABG) analysis is useful in evaluation of the clinical condition of critically ill patients; however, arterial puncture or insertion of an arterial catheter may cause many complications. This study evaluated whether pH, partial pressure of carbon dioxide (PCO2) and bicarbonate (HCO3-) values of venous ...
Oderich Gustavo S - - 2003
Klippel Trenaunay syndrome is usually managed conservatively with surgery reserved for patients with symptomatic but mild cosmetic deformity or persistent venous hypertension despite nonoperative measures. Deep venous reconstruction is necessary in a small group of patients who present with significant chronic venous insufficiency due to hypoplastic, absent, or occluded deep ...
O'Donnell Martin - - 2003
BACKGROUND: Numerous trials and meta-analyses have shown that extended out-of-hospital prophylaxis with low-molecular-weight heparin reduces asymptomatic and symptomatic venous thromboembolism after total hip arthroplasty. We hypothesized that knowledge of the results of screening tests may have resulted in overdiagnosis of symptomatic venous thromboembolism in many of these studies. The purpose ...
Ioannou C V - - 2003
AIM: To investigate the anatomic distribution of vein reflux in limbs with healed or active ulcers (CEAP V and VI). METHODS: Sixty limbs (58 patients) belonging to CEAP classes V and VI were identified from 798 limbs (519 patients) with ultrasonically proven chronic venous insufficiency (CVI). Age, gender, duration of ...
Burkart David J - - 2003
PURPOSE: To prospectively assess the feasibility, risk profile, and effect on fibrinogen levels of combination tenecteplase (TNK) and eptifibatide in transcatheter thrombolysis for peripheral arterial and venous thromboocclusive disease. MATERIALS AND METHODS: Sixteen consecutive patients (seven men, nine women) seen at our institution between March and August 2002 with arterial ...
Kirkeby-Garstad Idar - - 2003
We studied 150 adult cardiac surgery patients to assess visualization of the venous cannula and the venous system by intraoperative transesophageal echocardiography and to register the incidence of cannulation of hepatic veins. The quality of images, the dimensions of the venous system, the position of the venous cannula, and the ...
Ayarragaray Javier Eduardo Ferrari JE Center for Study and Treatment of Renal Diseases, Department of Vascular and Endovascular Surgery, Buenos Aires, Argentina. - - 2003
The most common cause of graft failure in patients undergoing hemodialysis is outflow venous stenosis. Long-term compromise of venous central trunks must be resolved. This study was undertaken to evaluate an unusual surgical option, bypass to decompress a long-term vascular graft to the femoral vein, improving venous outflow, alleviating symptoms ...
Hyers Thomas M - - 2003
Venous thromboembolism, including deep vein thrombosis and pulmonary embolism, represents a significant source of morbidity and mortality in the United States and worldwide. The pharmacologic management of venous thromboembolic disease has witnessed significant advances since oral anticoagulant and heparin therapies began to gain widespread use more than 50 years ago. ...
Golledge J - - 2003
BACKGROUND: varicose veins are present in up to 40% of the population. They may be associated with considerable morbidity. Around 70% of patients with chronic venous insufficiency have evidence of superficial venous incompetence on duplex imaging. METHODS: in this publication we review the evidence available regarding the pathogenesis of varicose ...
Cheung Ning - - 2003
PURPOSE: To define the normal and variant venous anatomy in the human orbit. METHODS: Orbital dissections, focusing on the venous system, were performed on 17 formalin-preserved human cadavers (34 orbits) and two fresh orbits. Dissections were carefully documented photographically. Results were compared with those in previous reports on the venous ...
Sato Thomas N - - 2003
Vascular development is a complex process. In the past decade, significant advances have been made in the understanding of molecular mechanisms underlying vascular system development. Most recently, a model describing a signaling pathway that governs the differentiation of arteries and veins has emerged. Furthermore, the idea that angiogenesis of arteries ...
Hattori Yasunori - - 2003
Adequate venous outflow is the most important factor for successful fingertip replantation. The authors have attempted venous anastomosis in all cases of fingertip replantation to overcome postoperative congestion. In this article, the significance of venous repair for fingertip replantation is described from the authors' results of 64 complete fingertip amputations ...
Gori Tommaso - - 2003
This study investigated whether oral supplemental folic acid can prevent the development of nitrate tolerance and whether it has different effects on the arterial and venous systems. Twenty-four healthy male volunteers received either placebo or folic acid (10 mg/d) for 14 days. Additionally, all subjects underwent concurrent transdermal nitroglycerin therapy ...
Shukla Vershalee - - 2003
This is the second of two articles designed to provide detailed user-friendly schematics of the adult dural vascular anatomy. It supplements the first article on the intrinsic meningeal arteries and veins by describing the dural venous sinuses along with their three remaining connections: to the brain, to the diploë, and ...
Ca┼čkurlu Turhan - - 2003
OBJECTIVE: The diameters of the veins in the pampiniform plexus have been used to diagnose subclinical varicocele. But there are many cutoff points and some controversies about the diagnosis. These cause difficulty in the evaluation of the results of epidemiological and clinical studies. Our aim is to establish the reliability ...
Adams Ralf H - - 2003
Recent research has demonstrated that not only haemodynamic factors but also genetic programmes control arterial-venous cell fate and blood vessel identity. The identification of arteries and veins was previously based solely on morphological criteria and is now greatly facilitated by specific molecular markers. Moreover, signalling pathways controlling the arterial-venous decision ...
Nizankowska-Mogilnicka E - - 2003
Frequently an inherited predisposition to thrombosis remains clinically silent until an additional environmental factor intervenes. The present study aimed to assess distribution of inherited risk factors of venous thrombosis in patients with venous thromboembolism (VTE). The prevalences of factor V Leiden (FV Leiden), prothrombin factor II G20210A (FII G20210A), C677T ...
Wang Min - - 2003
1 We investigated the adrenergic mechanisms of the two venous systems that drain the nasal mucosa, thereby their exact role in eliciting nasal decongestion. The action of endogenously released noradrenaline and exogenous adrenergic agonists on different segments of the nasal venous systems, i.e. collecting (LCV, SCV) and outflow (SPV) veins ...
Nelson E A - - 2003
It is estimated that people in industrialised countries have a 1% chance of suffering from a leg ulcer at some time in their life. The majority of leg ulcers are associated with circulation problems; poor blood return in the veins causes venous ulcers (around 70% of ulcers) and poor blood ...
Gasparis Antonios P - - 2002
The reperfusion of an ischemic limb in the absence of suitable target artery remains a formidable task. The authors report a case of an ischemic limb in patient whose distal arteries were identified intraoperatively as unsuitable for conventional revascularization. A distal arteriovenous fistula was created between the already arterialized in ...
San Millán Ruíz Diego - - 2002
BACKGROUND AND PURPOSE: Passing from the supine to the upright position favors cerebral venous outflow into vertebral venous systems rather than into the internal jugular veins. We sought to determine venous connections between dural venous sinuses of the posterior cranial fossa and craniocervical vertebral venous systems. METHODS: Corrosion casts of ...
Ezzine Samia - - 2002
BACKGROUND: Mivacurium and isomers undergo rapid hydrolysis by plasma cholinesterase. As this enzyme is largely distributed, it cannot be excluded that these isomers might undergo peripheral elimination. This hypothesis was investigated in patients by measuring the difference between arterial and venous concentrations under a constant-rate continuous infusion of mivacurium. METHODS: ...
Watts R - - 2002
Fast arterial-venous transit in the carotid arteries requires accurate, reliable timing of the acquisition to the bolus transit to maximize arterial signal and minimize venous artifacts. The rising edge of the bolus is not utilized in conventional elliptical-centric view-ordering because the critical k-space center must be acquired with full arterial ...
Wang Yi - - 2002
RATIONALE AND OBJECTIVES: To investigate the phenomena and causes for undesired venous signal in the distal station of bolus chase 3D MRA. METHODS: Consecutive patients (in 8 months) undergoing peripheral MRA consisting of 2D projection MRA of the tibial trifurcation and 3D bolus chase MRA were retrospectively evaluated. Venous contamination ...
Petitou Maurice - - 2002
Fondaparinux (Arixtra), a synthetic pentasaccharide, is the first in a new class of antithrombotic agents that selectively inhibit coagulation factor Xa. In vitro experiments demonstrated that it is a selective inhibitor of factor Xa. In plasma, fondaparinux selectively binds to antithrombin, catalyzes factor Xa inhibition, and thereby inhibits thrombin generation. ...
Coughlin P A - - 2002
Unlike arterial disease, most vascular surgeons have very little experience in performing bypass procedures for venous obstruction especially when occurring in children. Given the lack of published literature when compared to arterial procedures, we report a successful venous crossover procedure following iatrogenic injury and subsequent occlusion of the right common ...
Sekhar Laligam N - - 2002
Although cerebral veins and venous sinuses are very important to the neurosurgeon, they have received adequate attention only recently. The consequences of cerebral venous occlusion are well known. When the venous outflow is compromised due to a lack of adequate collateral circulation, venous infarction follows, with swelling, haemorrhage and neuronal ...
Barton Jennifer - - 2002
PURPOSE: To evaluate the ability of PhotoPoint photodynamic therapy (PDT) to suppress venous anastomotic intimal hyperplasia (IH) in a canine prosthetic arteriovenous graft (AVG) model. METHODS AND MATERIALS: Bilateral femoral AVGs were placed in 12 mongrel dogs. PhotoPoint PDT was optimized by treating venous anastomoses with a fixed dose of ...
Johnson Sue - - 2002
Graduated compression therapy is the recognised gold standard for the treatment of venous ulcers, usually in the form of four-layer bandaging. Unfortunately with some patients the bulkiness of the bandages leads to non-compliance. An alternative to bandaging could be the use of below-knee graduated compression hosiery. This article will review ...
Brew S S National Hospital for Neurology and Neurosurgery, Queen Square, London, - - 2002
Dural arteriovenous shunts (DAVS) occur within the walls of dural venous sinuses or their tributaries. They may be related to previous episodes of sinus thrombosis. The presence of impediments to venous outflow results in venous congestion, predisposing to haemorrhage and cerebral parenchymal damage. Cerebral venous congestion is an indication for ...
Gelfand Eli V - - 2002
This venous thromboembolism guidebook incorporates evolving contemporary concepts in diagnosis and management of pulmonary embolism (PE) and deep venous thrombosis (DVT) into a user-friendly menu. The purpose of this document is to provide a literature-based review of the current clinical approach to venous thromboembolism and up-to-date references for further study ...
Lee Paul - - 2002
Deep vein thrombosis (DVT) leads to venous ulcers in later life. Venous ulcers are the majority of chronic lower extremity wounds. Recent evidence suggests that hyperhomocysteinemia is an independent risk factor for venous thrombosis. Other evidence suggests that dietary supplementation with folic acids and vitamins helps to change hyperhomocysteinemia. This ...
Peterson A M - - 2002
Detection of a venous angioma at the root entry zone is important for surgical planning, so that the neurosurgeon will be aware that both veins and arteries may require microvascular decompression. In selected cases, alternative treatment may be indicated to avoid the potential surgical complication of a venous infarct. Trigeminal ...
Kelly Anne-Maree - - 2002
This prospective study of patients with acute respiratory illness or potential ventilatory compromise compared pCO(2) and pH on an arterial and a venous blood sample with the aims of determining whether venous pH and pCO(2) can replace arterial values in the management of patients with acute respiratory disease and to ...
García-Rinaldi Raúl - - 2002
We implanted cryopreserved allograft monocusp patches made from cadaveric pulmonary arteries to correct nonthrombotic valvular insufficiency of the common femoral vein in patients with chronic venous ulcers. Thirty-eight patients with 40 ulcers of longer than 3 years' duration underwent valvular repair of the common femoral vein from September 1995 through ...
Zhong T P - - 2001
Arteries and veins are morphologically, functionally and molecularly very different, but how this distinction is established during vasculogenesis is unknown. Here we show, by lineage tracking in zebrafish embryos, that angioblast precursors for the trunk artery and vein are spatially mixed in the lateral posterior mesoderm. Progeny of each angioblast, ...
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