Relationships between Venous Return and Blood Pressure in Caval Veins and Right Atrium During Pressor Stimulation

Abstract

The dynamics of changes in blood flow and pressure in the superior and inferior vena cava, total venous return, and right atrial pressure in response to pressor stimuli were studied in acute experiments on cats. It was shown that blood flow and pressure in caval veins changed synchronously and unidirectionally, while shifts in the right atrial pressure did not depend on direction and magnitude of changes in caval flow and pressure and total venous return. Our results suggest that right atrial pressure does not play a role in the regulation of venous return.