Cardiac afterload

これは何か

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

なぜ重要か

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

異常値が生じる根本原因

• 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

どの判断に影響するか

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

解釈上の注意

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

関連疾患