We performed pulmonary venous occlusions in order to check the validity of the pulmonary capillary pressure measurements obtained using pulmonary arterial occlusion in the intact animal. The venous and arterial postocclusion pressure profiles were recorded using balloon catheters introduced, respectively, into a left lower lobe vein and into a right pulmonary artery in the anaesthetized open-ch...

The possibility that venous blood could be withdrawn through a radial artery cannula when venous pressure is high was examined in 30 patients during cardiopulmonary bypass for coronary artery bypass operation. Progressive desaturation of radial artery blood occurred when venous pressure was equal to arterial pressure. Desaturation not only increased with duration of venous obstruction but also ...

MITZNER, WAYNE. Hepatic outJrow resistance, sinusoid pressure, and the vascular waterfall. Am. J. Physiol. 227(3): 513-519. 1974.The pressure-flow characteristics of the hepatic common outflow resistance were determined in five anesthetized dogs. These curves were shown to be nearly linear in the range of normal flows, but exhibited a moderate convexity toward the pressure axis at low flows. Th...

The intracranial venous sinus is an important component of vascular disease. Many diseases involve the venous sinus and are accompanied by venous sinus stenosis (VSS), which leads to increased venous pressure and high intracranial pressure. Recent research has focused on stenting as a treatment for VSS related to these diseases. However, a systematic understanding of venous sinus stenting (VS-S...

BACKGROUND The effects of surgical pneumoperitoneum on lower-limb venous hemodynamics have already been studied; however, the effects of intermittent compression boots are not known in such venous-stasis conditions. METHODS In 12 volunteers and 12 patients, the venous hemodynamic effects of intermittent leg compression were studied under external abdominal pressure or during laparoscopic chol...

To quantify the resistance and particularly the capacitance properties of the entire pulmonary vascular bed, isolated perfused lungs of nine dogs were studied. In each dog, with a fixed endotracheal pressure of 5 mm Hg, the arterial pressure-flow and pressure-volume relations were determined while venous pressure was fixed at constant values of 2, 5, and 8 mm Hg. In the same dogs, the venous pr...

Shen T, Baker K. Venous return and clinical hemodynamics: how the body works during acute hemorrhage. Adv Physiol Educ 39: 267–271, 2015; doi:10.1152/advan.00050.2015.—Venous return is a major determinant of cardiac output. Adjustments within the venous system are critical for maintaining venous pressure during loss in circulating volume. This article reviews two factors that are thought to ena...

The veins contain approximately 70% of total blood volume and are 30 times more compliant than arteries; therefore, changes in blood volume within the veins are associated with relatively small changes in venous pressure. The terms venous capacity, compliance, and stressed and unstressed volumes are defined. Decreases in flow into a vein are associated with decreases in intravenous pressure and...

Experiments were done to test the hypothesis that alpha receptor blockers antagonize more effectively venous than arterial responses to norepinephrine in man.Systemic arterial blood pressure, venous pressure in the forearm, blood flow through the forearm, and the volume of the forearm at a venous pressure of 30 mm Hg were measured using pressure transducers and a mercury strain-gauge plethysmog...