Venous return

これは何か

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

なぜ重要か

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]

異常値が生じる根本原因

• 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

どの判断に影響するか

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

解釈上の注意

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

関連疾患