Complete recovery in plasma of enzymes lost from the heart after permanent coronary artery occlusion in the dog

W T HermensR S Reneman


Plasma activities of creatine kinase (CK) and alpha-hydroxybutyrate dehydrogenase (HBD) were measured after permanent coronary artery occlusion in the dog. Cumulative release of enzymes in plasma was calculated from these data by using a previously validated two-compartment model for circulating enzymes. Regional myocardial ischemia was measured by injection of radiolabeled microspheres. After 48 hours, the dogs were killed, and a detailed map of left ventricular enzyme activity was obtained from 108 tissue samples. Cumulative release into plasma of CK and HBD was 96 +/- 20% and 112 +/- 26%, respectively, of the total activities depleted from the heart (mean +/- SD, n = 11). The scatter in these values is inherent to the calculations, and it is concluded that both enzymes are recovered completely in plasma and, thus, can be used as quantitative markers of injury. Discrepancies between this result and earlier reports on the recovery of CK are only partly apparent and can be explained partly by underestimation of the elimination rate of CK from plasma, irregardless of tissue edema and incomplete extraction of enzyme activity from tissue.


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