where P represents the pressure gradient between the pulmonary artery and the pulmonary vein, F, the blood flow per unit time, and R. the vascular resistance. For a given pressure gradient and flow rate, R will be determined, among other things, by the physical dimensions of the chaniiels that the blood traverses. In a rigid hydraulic system this formula applies over a wide range of flow and pr...

where P represents the pressure gradient between the pulmonary artery and the pulmonary vein, F, the blood flow per unit time, and R. the vascular resistance. For a given pressure gradient and flow rate, R will be determined, among other things, by the physical dimensions of the chaniiels that the blood traverses. In a rigid hydraulic system this formula applies over a wide range of flow and pr...

Decreased vascular resistance and vasoconstrictor response during pregnancy enables an increase in cardiac output and regional blood flow to the uterine circulation. We sought to determine whether inhibition of vascular smooth muscle ATP-sensitive potassium (K+ATP) channel activity during pregnancy increased systemic and/or regional vascular resistance and resistance response to ANG II. A total...

background: angiotensin converting enzyme (ace) upregulation in stromal cells of joints affected by rheumatoid arthritis may lead to higher tissue angiotensin ii that is a vasoconstrictor and mitogen factor. to date, the role of angiotensin ii on regulating blood flow in inflamed joints has not been studied.   methods: acute and chronic joint inflammation was induced in rabbits by intra-articul...

Background: Angiotensin converting enzyme (ACE) upregulation in stromal cells of joints affected by rheumatoid arthritis may lead to higher tissue angiotensin II that is a vasoconstrictor and mitogen factor. To date, the role of angiotensin II on regulating blood flow in inflamed joints has not been studied. Methods: Acute and chronic joint inflammation was induced in rabbits by intra-articular...

Hypertension is a major risk factor for the cardiovascular diseases. One of the factors contributing to blood pressure is peripheral vascular resistance. Vascular stiffness plays a key role in developing the hypertension, leading to increased systolic blood pressure and pulse pressure. from Avicenna s perspective, the blood pressure caused by 1- Increased blood volume 2- Warm heart dystemperame...