How is cardiac mechanical work output related to arterial blood pressure and stroke volume per beat?
Answer and explanation
Correct answer: D. Work = Stroke Volume * Mean Arterial Pressure
- Step 1: Mechanical work done by a hydraulic pump is W = integral P dV. Step 2. For ventricular ejection, external mechanical stroke work is approximately Stroke Volume (SV) multiplied by Mean Arterial Pressure (MAP). *Answer: Work = Stroke Volume Mean Arterial Pressure. Why not the others:* Division by pressure inverts relationship; HR SV gives cardiac output, not work; Pulse pressure product is invalid.
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