Search Results
Results 451 - 500 of 1039
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Saran B R - - 2001
BACKGROUND: Familial primary pulmonary hypertension (PPH) is a rare, fatal, autosomal dominant disease that results in right heart failure from idiopathic obliteration of the pulmonary arteries. Patients develop stagnation of venous blood flow and elevated venous pressure. METHODS: The authors retrospectively reviewed the clinical records of three patients diagnosed with ...
Gerriets T - - 2000
Neurologic injury subsequent to decompression from diving may be due to paradoxical arterialization of venous gas emboli. Of 40 divers who performed 53 open water dives after being tested for a patent foramen ovale (PFO), arterial gas emboli were detected in 7 of 13 dives, which resulted in venous bubbles. ...
Fritsche R - - 2000
We used a newly developed digital motion analysis video technique to study the effects of nitric oxide (NO) and epinephrine on the early larval arterial and venous vasculature of zebrafish. Application of the NO donor sodium nitroprusside resulted in a significant increase in both the venous and arterial vessel diameters, ...
Robert J H - - 2000
During lung transplantation, the venous anastomosis is performed between the atrial cuffs of the donor and the receiver. In certain rare circumstances, however, the surgeon may find two veins and no possibility to reposition the clamp more proximally. A simple technique can be used in this case: both veins are ...
Mohr D N DN Division of Area General Internal Medicine, Mayo Clinic, 200 First St SW, Rochester, MN 55905, - - 2000
To estimate the incidence and determine predictors of venous stasis syndrome and venous ulcers after deep venous thrombosis and pulmonary embolism. This population-based retrospective cohort study reviewed medical records of 1527 patients with incident deep venous thrombosis or pulmonary embolism between 1966 and 1990. We recorded baseline characteristics, event type ...
Piatt J H - - 2000
The infratentorial supracerebellar approach is a popular technique for exposure of lesions of the superior vermis and pineal region. The cerebellomedullary fissure approach is enjoying increasing application as a technique for exposure of the fourth ventricle. Occasionally, a tumor that arises in the quadrigeminal plate or the superior vermis grows ...
Battistini B - - 2000
Upregulation of the endothelin (ET) system, following coronary ischemia-reperfusion injury, may contribute to coronary vasospasm and congestive heart failure. Because endothelin-1 (ET-1) is rapidly cleared from the circulation, the levels of its inactive precursor big ET-1 and the ET-1/big ET-1 ratio may constitute better ways to assess the activation of ...
Lapietra A - - 2000
OBJECTIVES: The proliferation of minimally invasive cardiac surgery has increased dependence on augmented venous return techniques for cardiopulmonary bypass. Such augmented techniques have the potential to introduce venous air emboli, which can pass to the patient. We examined the potential for the transmission of air emboli with different augmented venous ...
Wladis A R - - 2000
Angioaccess for hemodialysis in an extremity with disadvantaged venous outflow has reduced long-term patency. We hypothesized that arteriovenous bridge graft patency could be improved in patients with disadvantaged venous outflow by preoperative venous duplex mapping. The charts of 114 patients who underwent 115 prosthetic arteriovenous bridge grafts were reviewed. Disadvantaged ...
Min J Y - - 2000
BACKGROUND: The morphological definition of atrial chambers, and the determination of atrial laterality, are based on analysis of the structure of the atrial appendages. The systemic and pulmonary venous connections to the heart, nonetheless, are important in the management of patients having isomeric appendages. In this study, therefore, we analysed ...
Wakefield T W - - 2000
Prophylaxis for venous thromboembolism is an area that has received intense study in certain conditions, but less than adequate coverage in other areas. In considering who needs prophylaxis, patients are categorized into levels of risk. Clinical venous thromboembolism can be correlated to these levels of risk. Methods of prophylaxis include ...
Takase S - - 2000
The objective of this study was to assess the relationship of signaling molecules to monocyte/ macrophages as a precursor to venous valve and venous wall dysfunction in patients with varicose veins. One of the hallmarks of venous dysfunction is destruction of venous valves with subsequent reflux and elevation of distal ...
Durand P Y - - 2000
These authors report on validating their choice of disposable clamps in arterial and venous microsurgery in a comparative and experimental study using the scanning electron microscope. This appears to be the first evaluation of venous endothelial clamping lesions. Early intimal clamping lesions were studied using three different clamps and two ...
Weinfeld A B - - 2000
Any surgical intervention that involves the manipulation of veins, large or small, carries the risk of acute venous congestion. Venous congestion is the product of an imbalance between arterial inflow and venous outflow, and results in the stasis of blood in the tissues that are normally drained by the affected ...
Han S K - - 2000
Adequate venous repair is not always possible in fingertip replantation. We have used topical and systemic anticoagulation for fingertip replantation to overcome venous congestion in cases without venous repair or in cases in which there is obstruction of a repaired vein. Our technique consists of continuous external bleeding via a ...
Cihangiroglu M - - 2000
This report describes systemic-to-pulmonary venous connections at the pleural level resulting from superior vena cava occlusion. The interval development of new venous collaterals within a 3-year period represents an advanced manifestation of SVC occlusion in this patient with a history of pleural disease. In this case, progressive venous thrombosis caused ...
Gokel Y - - 2000
BACKGROUND/AIMS: The aim of this study was to examine a plausible correlation between venous and arterial blood gas values in acidotic patients with chronic uremia or diabetic ketoacidosis (DKA). METHODS: A total of 152 arterial and 152 venous blood samples from uremic patients (n = 100), DKA patients (n = ...
Harkin D W - - 2000
BACKGROUND: Complex limb trauma often involves combined arterial and venous injury, and the resultant ischaemia-reperfusion injury (IRI) causes both local and remote organ injury. This study assessed the influence of the timing of restoration of venous drainage on IRI. METHODS: Male New Zealand white rabbits (n = 36) were randomized ...
Lopez D M - - 2000
OBJECTIVE: This study tested the hypothesis that mixed venous carboxyhemoglobin concentrations (V-COHb) and internal jugular carboxyhemoglobin concentrations (I-COHb) accurately predict arterial carboxyhemoglobin concentrations (A-COHb). In addition, this study tested the hypothesis that there is a high correlation at low (COHb, 0% to 10%), moderate (COHb, >10% to 40%), and high ...
Hamada J - - 2000
OBJECT: Of all intracranial dural arteriovenous fistulas (DAVFs), those with cortical venous drainage associated with cortical venous ectasia or varices are predisposed to an aggressive course and produce progressive neurological symptoms or hemorrhages. The authors undertook a histological examination of venous aneurysms and arterialized veins in the proximity of these ...
Turner I C - - 2000
Strain gauge plethysmography (SGP) is a non-invasive method used in the detection of deep venous thrombosis (DVT). The technique is based on the measurement of calf volume changes in response to venous occlusion by a thigh cuff, the volume changes reflecting the rates of arterial inflow and venous outflow. A ...
Masson C - - 2000
We report two cases of cerebral venous angioma presenting as venous infarction, one in the left parietal lobe, the other in the left frontal lobe. Cerebral imaging demonstrated thrombotic occlusion of the draining vein of the venous angioma associated in the latter case with thrombosis of the anterior part of ...
Reber A - - 2000
Twenty consecutive patients undergoing cardiac surgery with cardiopulmonary bypass (CPB) were allocated at random to group 1 (n = 10, high inspired oxygen fraction (FIO2) after CPB), or group 2 (n = 10, moderate FIO2 after CPB). The effects of each FIO2 on arterial and mixed venous concentrations of endothelin-1 ...
Reed K L - - 2000
OBJECTIVE: The purpose of this study was to determine the direction of transmission of umbilical venous Doppler flow velocity changes in human fetuses. STUDY DESIGN: Strip chart recordings of simultaneously measured umbilical arterial and venous velocities were examined at two sites in the umbilical cord, one near the fetus (proximal) ...
- - 2000
Venous (gravitational) leg ulcers are unsightly, sometimes painful and often difficult to heal. They are associated with incompetence of valves in the deep leg veins and venous hypertension. The main approaches in the management of venous leg ulcers have been to reduce the 'back pressure' in the veins by surgical ...
Herouy Y - - 2000
Metalloproteinase-mediated proteolysis plays an important role during the phase of venous ulcer formation and wound repair. Venous ulcers manifest as a breakdown of the collagenous stromal tissue and are highly associated to chronic venous insufficiency. A major change in our understanding of the pathogenesis of venous ulcers occurred with the ...
Haenen J H - - 2000
The purpose of the present study was to evaluate the relationship between calf muscle pump dysfunction (CMD) and the presence and location of valvular incompetence. Deep vein obstruction might influence CMD, and so venous outflow resistance (VOR) was measured. VOR and calf muscle pump function were measured in 81 patients, ...
Jiang P - - 2000
Venous function measured by air-plethysmography (APG) was compared to anatomical patterns of reflux assessed by duplex scanning and associated clinical features in 253 limbs with recurrent varicose veins following previous superficial venous surgery. The results showed that a previous history of deep venous thrombosis, previous procedure with preservation of the ...
Frick R W - - 2000
Escin, hydroxyethylrutoside (HR), and Daflon have been shown to be safe and effective for the treatment of chronic venous insufficiency (CVI). They seem to work differently than compression therapy, suggesting that they would usefully augment this therapy. All three phlebotonics attenuate the drop in adenosine triphosphate in venous endothelial cells ...
Eifert S - - 2000
The overall incidence of congenital vascular malformations in the general population is 1.5%. Approximately two thirds of them are malformations of venous predominance. Abnormalities of the deep venous trunks have been observed in association with large superficial compensatory varices in these type of malformations. Knowledge of the integrity of the ...
Smout J D - - 2000
Autologous vein should be used at all costs for infrainguinal grafting. There is, nevertheless, a need for other materials in tertiary referral centres whose practice is becoming more complex. Polytetrafluoroethylene (PTFE) has been the prosthesis of choice for most surgeons, but results were poor for grafts to crural arteries. The ...
Ageno Walter - - 2000
Venous thromboembolism is a common disease that is associated with considerable morbidity if left untreated. Recently, low-molecular-weight heparins (LMWHs) have been evaluated for use in acute treatment of deep venous thrombosis and pulmonary embolism. Randomized studies have shown that LMWHs are as effective as unfractionated heparin in the prevention of ...
Vickers M M - - 2000
Vascular erectile dysfunction (VED) is composed of penile arterial insufficiency and veno-occlusive dysfunction. Both the arterial and venous dysfunctions are associated with cellular and molecular abnormalities. The goal of this work is to provide a summary of the gross anatomical and physiological abnormalities associated with VED and a theory of ...
Reekers J A - - 2000
Mechanical thrombectomy is of growing importance for the treatment of thrombus. Although there are numerous reports about dialysis fistulae and arterial thrombosis, venous applications are currently not well known. We report that an extensive venous thrombotic occlusion can be treated with mechanical thrombectomy, without additional local lysis. This report deals ...
Moro H - - 2000
We describe herein our technique of performing complex venous reconstruction for a patient with chronic, multiple, and long segmental venous obstruction from the left iliac vein to the infrapopliteal deep veins. To improve venous outflow and prevent venous gangrene caused by graft failure, we preserved the ipsilateral saphenous vein without ...
Faioni E M - - 1999
With the aim of establishing whether the HR2 haplotype in factor V affects the risk of venous thromboembolism, a retrospective multicenter cohort study was performed in 810 family members identified through 174 probands who suffered from at least 1 episode of deep vein thrombosis and/or pulmonary embolism and had an ...
Davidson B L - - 1999
The diagnosis of venous thromboembolic disease, and pulmonary embolism in particular, remains problematic. Physicians should strongly consider empiric anticoagulation if the best available diagnostic tests are inconclusive, because treatment is usually safe and successful. Twice-daily subcutaneous low-molecular-weight heparin, dosed without monitoring, may eventually replace standard heparin for most treatment of ...
Edmonds J L - - 1999
Successful microvascular free flap reconstruction requires adequate arterial inflow and venous outflow. We report 4 cases that demonstrate the not uncommon occurrence of locating valves in veins during microvascular head and neck reconstructive procedures. Failure to recognize these valves could have compromised the venous anastomosis. The anatomical literature states that ...
Cicinelli E - - 1999
Experimental investigations suggest that a basal release of nitric oxide (NO) occurs in arterial but not in venous endothelium. We therefore decided to compare plasma levels of NO in the arterial and venous circulation. Parallel blood samples were drawn from the radial artery and brachial vein in 15 healthy drug-free ...
Houry D - - 1999
Venous thromboembolism is a significant cause of morbidity in the United States. Thrombectomy devices are not currently the standard of treatment in deep venous thromboses. The Amplatz thrombectomy device is used for arterial occlusions and pulmonary emboli, but its regular use in venous thromboses has not been documented in the ...
Hallock G G GG Division of Plastic Surgery at Lehigh Valley Hospital, Allentown, PA, - - 1999
The fibula has deservedly become a workhorse flap for vascularized bone grafts. As with most flaps, much is known regarding idiosyncrasies of its arterial supply, and the corresponding venous system has generally been assumed to be comparable. Because this donor site has become increasingly versatile, a detailed anatomic study that ...
Karamürsel S S Department of Plastic and Reconstructive Surgery, Hacettepe University Medical Faculty, Ankara, Turkey. - - 1999
Vessel anastomosis is the most critical step in free tissue transfers and replantation surgery. We report on a new microvascular anastomosis technique that uses a metallic circle around the anastomotic circumference. Sutures are first passed inside the circle and tied outside and over the circle so as to stretch open ...
Kaandorp D W - - 1999
A three-dimensional dynamic gadolinium-enhanced carotid artery imaging protocol with 10 sec per phase was evaluated with respect to the acquisition of an arterial-only phase after contrast bolus injection. Subsequently, the eigenimage filter was used to suppress any venous signal based on a difference in arterial and venous temporal enhancement patterns. ...
Yilmaz M - - 1999
Replantation of amputated digits at distal levels is difficult because the vessels are either too small or absent in the amputated part. Clinically unconventional anastomoses have been tried in such instances. Arterialization of the venous system in the amputated part was also utilized for this purpose. In this study, a ...
Belott P H - - 1999
The axillary vein has been suggested as an alternate site for venous access to avoid the "subclavian crush phenomenon. " Many techniques have been used to access this structure. They include complicated anatomical landmarks, contrast venography, Doppler, and ultrasound. A simple technique using the basic anatomical landmark of the deltopectoral ...
Hiwatashi A - - 1999
A rare case with a pseudolesion in segment II of the liver observed on computed tomography (CT) during arterial portography caused by the aberrant left gastric venous drainage is presented. Close observation of the celiac angiography was helpful in recognizing this pseudolesion. Selective catheterization of the left gastric artery and ...
Goyal M M Department of Medical Imaging, The Toronto Western Hospital, University Health Network; Toronto, Ontario, - - 1999
We report a case of dural arteriovenous fistual (DAVF) with cortical venous reflux in whom disconnection of the refluxing cortical vein was achieved by using a retrograde transcortical venous approach through the cortical vein itself.
Caruso R D - - 1999
BACKGROUND AND PURPOSE: The suboccipital cavernous sinus, a vertebral venous plexus surrounding the horizontal portion of the vertebral artery at the skull base, provides an alternative pathway of cranial venous drainage by virtue of its connections to the cranial dural sinuses, the vertebral venous plexus, and the jugular venous system. ...
Voci S L - - 1999
An appropriate Doppler response to valsalva in the common femoral veins has been described previously as excluding a more proximal venous obstruction. We describe our experience in three patients in whom an appropriate response to valsalva did not exclude a more proximal pelvic venous obstruction. Dampening of the Doppler waveforms ...
Phillips T J - - 1999
The cause of a leg ulcer should be determined before a course of treatment is undertaken, and this often can be accomplished through history taking, physical examination, and use of simple noninvasive testing. Most leg ulcers are caused by venous disease, arterial insufficiency, neuropathy, or a combination of these factors. ...
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