Relatively brief changes in perfusion pressure and flow through arterioles occur in a number of conditions, such as in the flying environment and during such common everyday activities such as bending forward at the waist. Also, brief periods of negative vertical acceleration (G(z)) stress, which reduces perfusion in the lower body, has been shown to impair the regulation of arterial pressure d...

Morphological vessel injury after clamping has been an important problem in vascular surgery. Although various techniques have been employed to occlude a vessel during a surgical procedure, a complete, atraumatic occlusion method has not yet been developed. In the present study, we describe use of a novel pressure-controlled and balloon-jawed vessel clamp to provide atraumatic vessel occlusion....

Abstract Left subclavian artery occlusion is frequently treated by stent placement. The most commented on In-Stent Restenosis excessive thrombus that squeezes the and leads to vessel occlusion. In this paper, an automatic system provided segment left arteries aortic arches from chest MRI (Magnetic Resonance Imaging) images, then identify of based gray-levels extracted arch. Experimental results...

PURPOSE: Free tissue transfer requires close postoperative monitoring for vascular occlusion. Vascular compromise commonly occurs in the immediate postoperative period in association with failure of the micro-vascular anastomosis. The resiliency of tissue to hypoxia and ischemia is crucial to the success of the surgery. It is estimated that 6 percent to 25 percent of skin flaps require a second...

During reactive hyperemia following a brief coronary artery occlusion, excess arterial inflow exceeds the blood flow debt incurred during occlusion by 300-600T. The present study was performed to determine whether this marked reactive hyperemia is essential for restoration of coronary vascular tone. Coronary blood flow was measured in unanesthetized dogs with electromagnetic flowmeters and hydr...

Limb ischemia is most often associated with atherosclerosis and older age. When a younger patient without risk factors for atherosclerosis presents with symptoms of limb ischemia, vascular occlusion may not be suspected initially, thus delaying diagnosis and treatment. Delayed diagnosis can lead to a poor outcome. Here, we describe several uncommon causes of limb ischemia and their initial pres...

case presentation we reported a 2-year-old boy with pph, who presented unusual and intractable seizure which suggested the diagnosis of md. we also reviewed a few previous reports about the association of pph with moyamoya disease. discussion moyamoya disease is a kind of cerebral vasculopathy and should be considered as a differential diagnosis for patients with unusual seizure attacks who are...

Hypertensive pulmonary vascular disease is characterized by abnormal proliferation of vascular endothelial and smooth muscle cells, leading to occlusion of pulmonary arterioles, pulmonary hypertension, right ventricular failure, and death. Compounds with antiproliferative effects on vascular endothelial and smooth muscle cells, such as 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase i...

Pulmonary embolism (PE) is caused by occlusion of the pulmonary artery or its branches. CTA is a ‘gold standard’ for the diagnosis and extent determination of PE. The etiology of embolic material may influence the extent and localization of embolism. The CTA assessment of influence of PE etiology on extent of vascular occlusion and clot localization. The study group consisted of 24 patients div...

PURPOSE To determine whether MR angiography can be used to differentiate between the two vascular causes of bithalamic hyperintensity on T2-weighted MR images: "top of the basilar" artery occlusion and deep cerebral vein thrombosis. METHODS A retrospective review identified six patients with bithalamic T2 hyperintensity of vascular causes. MR angiography was performed in four patients, MR ang...