The purpose of the present study was to determine the effect of a spinal cord injury (SCI) on resting vascular resistance in paralyzed legs in humans. To accomplish this goal, we measured blood pressure and resting flow above and below the lesion (by using venous occlusion plethysmography) in 11 patients with SCI and in 10 healthy controls (C). Relative vascular resistance was calculated as mea...

We examined coronary pressure-flow relations after chronic coronary artery occlusion induced by placement of an ameroid occluder on the left circumflex coronary artery in swine. An acute open-chest procedure was performed in nine pigs 27 +/- 2 days (mean +/- SEM) after surgical placement of the ameroid occluder, and in eight nonoperated control pigs. Coronary vascular resistances were measured ...

We sought a noninvasive alternative method of monitoring peripheral vascular resistance continuously in humans, based on the analysis of arterial pressure waveforms. Radial arterial pressure waveforms were recorded noninvasively with a tonometer and analysed using a neural network method. To test the accuracy of this method, the peripheral vascular resistance was also determined by an invasive ...

to study the resistance to standard dosage of clopidogrel among iranian patients following percutaneous coronary intervention measured by platelet aggregation test.patients undergoing percutaneous coronary intervention in imam hussein medical center, tehran, iran, who were under treatment with aspirin, but had no history of clopidogrel usage, entered the study. patients received standard dosage...

Background—Supraspinal sympathetic control of leg vascular tone is lost in spinal cord–injured individuals, but this does not result in a reduced leg vascular tone: Leg vascular resistance is even increased. The aim of this study was to assess the -adrenergic contribution to the increased vascular tone in the lower extremity in patients without central sympathetic control of leg circulation. Me...

vascular endothelial growth factor (vegf) is a multifunctional cytokine with distinct functions in angiogenesis, lymphangiogenesis, vascular permeability, and hematopoiesis. vegf is a highly conserved, disulfide-bonded dimeric glycoprotein of 34 to 45 kda produced by several cell types including fibroblasts, neutrophils, endothelial cells, and peripheral blood mononuclear cells, particularly t ...

purpose : to determine the association between retinal vascular diameter and its branching angles with diabetic retinopathy (dr) stages in diabetic patients methods : a descriptive analytic cross-sectional study was conducted in 62 diabetic patients (120 eyes) referred to farabi eye hospital between june 2008 and december 2009. digital fundus photography pictures were imported into photoshop so...

The mechanisms by which high salt intake increases vascular resistance in hypertensive humans are not clear. This study examined the possibility that salt loading produces structural changes of the forearm resistance vessels in hypertensive patients. Seventeen patients with essential hypertension were given 7 days of 70 mEq and 345 mEq sodium diet. Patients were arbitrarily divided into two gro...

BACKGROUND Few studies have examined the time-course of localized exercise training on regional blood flow in humans. The study examined the influence of handgrip exercise training on forearm reactive hyperemic blood flow and vascular resistance in apparently healthy men. METHODS Forearm blood flow and vascular resistance were evaluated, in 17 individuals [Age: 22.6 +/- 3.5], in both arms, at...

The effect of prostaglandin I2 and two other vasodilator agents, acetylcholine and sodium nitroprusside, on systemic and renal circulation was studied in 29 adult euvolemic Sprague-Dawley rats. Intra-aortic infusion of prostaglandin I2 (3.6 micrograms/kg/hr; n = 6 rats) produced significant vasodilation (p less than 0.05), as indicated by an average reduction in total peripheral vascular resist...