Cardiac afterload

這是什麼

Cardiac afterload is the outlet load the ventricle must push against to eject blood into the arterial system.^[1,2]

為什麼重要

Higher afterload makes ejection harder, so the same contraction may eject less blood unless the heart compensates.^[1]

發生異常的根本原因

• Outlet-load relation: Higher arterial pressure or vascular resistance increases the load the ventricle must overcome and can lower stroke volume; lower outlet load lets the same contraction eject more easily.^[1,2,3]
  Blood pressureSystemic vascular resistanceStroke volumeCardiac output

它會影響哪些判斷

• It connects blood pressure, vascular resistance, arterial load, stroke volume, and pump reserve.^[1,3]

解讀陷阱

• Afterload is not identical to a single cuff blood-pressure reading, though arterial pressure is a major part of the load.^[2,1]

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