Venous return

這是什麼

Venous return is the blood flow returning from the systemic veins to the heart.^[1]

為什麼重要

The heart can only pump what returns to it over time, so venous return is a major input-side constraint on cardiac output.^[1,2]

發生異常的根本原因

• Return-flow relation: Venous return rises when more blood volume and venous tone push blood back toward the heart; it falls when circulating volume is low, venous pooling is high, or return is obstructed.^[1,3,2]
  Circulating blood volumeVascular tone / vasodilationCardiac preloadCardiac output

它會影響哪些判斷

• It connects circulating volume, venous tone, preload, stroke volume, and cardiac output.^[1,2]

解讀陷阱

• Venous return is a system-flow concept and usually requires clinical context to evaluate.^[1]

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