Effect of acute ketoacidosis on the myocardium in diabetes.

Abnormalities of left ventricular function are often present in patients with diabetes who are in a stable metabolic state. To determine whether acute metabolic abnormalities may contribute to pathogenesis, patients with diabetes and ketoacidosis (Group 1) or hyperglycemia without ketosis (Group 2) were studied. They were assessed noninvasively for evidence of acute injury or dysfunction of the myocardium. Left ventricular function was assessed on admission and after clinical recovery. Myocardial enzyme release was examined during the acute phase. In Group 1, plasma glucose averaged 32 mM/L and carbon dioxide content 12.4 mEq/L. On echocardiography, the initial circumferential shortening velocity of 1.85 + 0.07 circumferences per second was significantly higher than the final circumferential shortening velocity of 1.31 + 01 (P < 0.005). The systolic time interval ratio, pre-ejection period/left ventricular ejection time, was significantly lower on the initial day compared with the second study. These data are consistent with enhanced ventricular performance. In group 2, plasma glucose averaged 29 mM/L, and carbon dioxide content was normal. The initial circumferential shortening velocity of 1. 1 circumferences per second and pre-ejection period/left ventricular ejection time ratio of 0.38 were normal and remained unchanged. There was no significant alteration of heart rate or arterial pressure in either group. In both groups, total serum lactate dehydrogenase and creatinine phosphokinase levels, as well as their cardiac isoenzymes, were within normal limits. Therefore, the initial increase of myocardial performance and subsequent restoration to normal, as well as the lack of cardiac enzyme increase in plasma, support the view that shortterm ketoacidosis does not contribute to the abnormalities of ventricular function in diabetes.