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Venous return (VR) is the flow of blood back to the heart. Under steady-state conditions, venous return must equal cardiac output (CO) when averaged over time because the cardiovascular system is essentially a closed loop.
if systemic venous return is suddenly decreased, right ventricular preload decreases leading to an decrease in stroke volume and pulmonary blood flow.
Decreased pulmonary venous return to the left atrium leads to decreased filling (preload) of the left ventricle, which in turn decreases left ventricular stroke volume by the Frank-Starling mechanism.

In this way, a decrease in venous return to the heart leads to an equivalent decrease in cardiac output to the systemic circulation.

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