Abstract
Myocardial function and oxygen consumption (MV̇O2) were studied during increased myocardial uptake of free fatty acids (FFA) induced by intravenous infusion of a fat emulsion (Intralipid) after heparinization in anesthetized and intact dogs. During raised myocardial uptake of FFA, MV̇O2 increased in all experiments. On the average, MV̇O2 rose from 8.6 to 10.7 ml/min·100 g, or 26% (P < 0.001). This was mainly due to elevated myocardial oxygen extraction, as myocardial blood flow was unchanged, or increased slightly. In the recovery period, MV̇O2 returned to normal. Left ventricular pressure, the maximal rate of rise of left ventricular pressure (dP/dt), heart rate, and cardiac output remained unchanged during the raised myocardial uptake of FFA.
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