Metabolic control of the circulation. Effects of acetate and pyruvate

The Journal of Clinical Investigation
C S Liang, J M Lowenstein


Chloralose-anesthetized dogs were infused intravenously with either Tris-acetate or Tris-pyruvate at 0.0375, 0.075, and 0.15 mmol/kg per min successively, each for 20 min. Acetate infusion increased cardiac output, left ventricular dP/dt and dP/dt/P, and coronary blood flow, while pyruvate infusion did not. Infusions of either substance increased arterial blood and skeletal muscle concentrations of citrate and malate, but only acetate infusion increased the tissue AMP content and decreased the ATP:AMP ratio. The increase in cardiac output produced by acetate was accompanied by an increase in total body oxygen consumption and a decrease in the difference between arterial and mixed venous blood oxygen. Myocardial oxygen consumption increased during acetate infusion, but the decrease in myocardial oxygen extraction and the increase in coronary sinus blood oxygen saturation suggest that an active coronary vasodilation which was not a result of the increased cardiac work, occurred. The concentration of hypoxanthine in the coronary sinus and the content of myocardial adenosine increased, which suggests that the increase in coronary blood flow was caused by the vasodilator action of adenosine released from the myocardium, and that ade...Continue Reading


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