Search Results
Results 451 - 500 of 1023
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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 ...
Hallock G G - - 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 ...
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 ...
Karamürsel S - - 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. ...
Jacob S - - 1999
BACKGROUND: Despite advances in vascular surgical and interventional radiological techniques, 14-20 per cent of patients with critical lower limb ischaemia will not be suitable for distal arterial reconstruction owing to occlusion of crural and pedal vessels. Following investigation into the venous anatomy of the foot, the disease-free venous bed was ...
Takahashi K - - 1999
PURPOSE: To evaluate the indication and advantages of venous sac embolization of pulmonary arteriovenous malformations (PAVMs) using interlocking detachable coils (IDCs). METHODS: We performed percutaneous embolization in 12 PAVMs in four patients using IDCs, initially placed in the venous sac or at the feeding artery to prevent systemic migration of ...
Loubser P G - - 1999
OBJECTIVE: This study examined arterial and venous blood flow during retrograde cerebral perfusion (RCP) to quantify what proportion of arterial inflow is not recovered as venous outflow. DESIGN: Prospective. SETTING: Community hospital, university setting, single institution. PARTICIPANTS: Twelve patients undergoing reconstructive aortic arch surgery with profound hypothermic circulatory arrest and ...
Uematsu M - - 1999
Venous aneurysms are rare lesions that may be the source of pulmonary emboli and can result in death. The authors have recently treated several patients who had venous aneurysms of the upper extremity, lower extremity, and jugular system. Venous aneurysms usually appear to have a safe natural history in these ...
Akiyama K - - 1999
The dual-stage venous cannula is widely used but can obstruct the surgeon's view and interfere with operative procedures in the aortic root. We designed a new stainless steel sheath for a dual-stage venous cannula that enables the cannula to bend and maintain the appropriate angle for the surgical procedures. We ...
Hardman J G - - 1999
Estimation of venous admixture in patients with impaired gas exchange allows monitoring of disease progression, efficacy of interventions and assessment of the optimal inspired oxygen fraction. A pulmonary artery catheter allows accurate measurement, although the associated risks preclude its use solely for estimation of venous admixture. Non-invasive methods require assumed ...
Malanin K - - 1999
In an attempt to clarify the pathophysiology of haemodynamics in legs with venous ulcer we investigated the effect of a single intermittent pneumatic compression treatment on the peripheral resistance of leg arteries and the cutaneous laser Doppler flux in the leg. Eight patients with venous leg ulcers and 10 subjects ...
Zimmet S E - - 1999
BACKGROUND: Venous leg ulcers are common in the adult population and cause a significant social economic burden. Despite their prevalence, venous leg ulcers are often managed inadequately. OBJECTIVE: To provide an overview of venous ulceration, including a review of the current understanding of the pathophysiology of venous ulceration and the ...
Zeevi B - - 1999
Studies in adult patients undergoing percutaneous coronary angioplasty have demonstrated differences in measured activated clotting time (ACT) in venous vs. arterial blood samples. Ninety-two patients with congenital heart disease undergoing cardiac catheterization were prospectively evaluated to compare venous vs. arterial ACT values in monitoring heparin effect in this population. Simultaneous ...
Mérida-Velasco J R - - 1999
PURPOSE: The aim of this work was to clarify the vascular relationships between the middle ear and the temporomandibular joint region during human fetal development. MATERIALS AND METHODS: Light microscopic studies were done on 40 human fetuses from 72 mm crown-rump length (C-R) to 150 mm C-R, which were stained ...
Siauve N - - 1999
Our purpose was to study the capillary leakage of MR contrast media using a pure capillary model, the rete mirabile of the eel. The rete is a countercurrent-exchange organ composed of an arterial and a venous capillary system that can be catheterized and perfused. Substances are introduced at the arterial ...
Bérard, Anick.
Objective. In order to prevent the last stages of chronic venous insufficiency of the lower limbs, a case-control study was performed to identify and quantify demographic and clinical risk factors for venous ulcer disease. A particular attention was given to history of superficial as well as deep vein thrombosis.
Anderson R H - - 1999
Knowledge of development is of crucial importance and can help clarify mechanisms of maldevelopment, but it must be properly validated. Concepts of development must be consistent with the anatomy seen in postnatal life. Such consistency is not always achieved. We have reviewed new and old accounts of cardiac embryology with ...
Kupersmith M J - - 1999
OBJECTIVE: To determine the cause of the visual dysfunction and effect of treatment on dural arteriovenous malformations (DAVMs) that secondarily involve the occipital lobe. BACKGROUND: DAVMs are an infrequent cause of visual dysfunction that should be amenable to treatment if diagnosed before permanent visual field loss. METHODS: The records of ...
Hundt W - - 1999
The purpose of our study was to evaluate the capability of a subsecond spiral-CT scanner using two contrast medium phases in staging of colorectal cancer. In our study we included 37 patients with proven rectum or colon carcinoma. Spiral CT was performed following tap-water enema of the colon in the ...
Galla T J - - 1999
In abdominal cutaneous island flaps of rats (n = 16), either the artery or the vein was clamped, while flap perfusion was simultaneously monitored with laser Doppler flowmetry (LDF) and photoplethysmography (PPG) to identify the occluded vessel responsible for insufficient perfusion. The LDF signal decreased promptly after arterial clamping. After ...
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