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Cardiac Power Output Revisited.

The heart is a pump, supplying hydraulic energy to maintain the circulation. The rate of energy output is termed cardiac power output (CPO). The subanalysis of the SHOCK trial (Should We Emergently Revascularize Occluded Coronaries for Cardiogenic Shock) by Fincke et al1 described CPO as the strongest hemodynamic correlate of outcome in cardiogenic shock, bringing this hemodynamic parameter into prominence as a measure of cardiac pumping ability. This seminal subanalysis of the SHOCK trial used the following equation to calculate CPO: