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Circulation, Vol 56, 199-205, Copyright © 1977 by American Heart Association

ARTICLES

Correlation of angiographic estimates of myocardial infarct size and accumulated release of creatine kinase MB isoenzyme in man

WJ Rogers, HG McDaniel, LR Smith, JA Mantle, RO Russel Jr and CE Rackley

Accumulated creatine kinase MB isoenzyme release (sigma CK-MB) during acute myocardial infarction was correlated with biplane left ventricular (LV) angiographic estimates of percent abnormally contracting segment (%ACS) and ejection fraction (EF) in 35 patients who underwent diagnostic angiography at a mean of 33 +/- 4 days post myocardial infarction (MI). Of the 35 patients, 18 had no evidence of prior MI and their sigma CK-MB showed good correlation with %ACS (r = 0.84) and with EF (r = - 0.78). An additional two patients with first (inferior) infarct secondary to stenosis of the right coronary artery proximal to the origin of the right ventricular arterial blood supply had disproportionately large sigma CK-MB, suggesting a combination of LV and RV necrosis. In the 15 patients with prior infarct, there was no significant correlation between sigma CK-MB and %ACS or EF. However, in the subgroup of patients with anterior MI, %ACS correlated with sigma CK-MB, both in patients with no prior MI (r = 0.88, N = 12) and in patients with prior MI (r = 0.69, N = 9). These independent angiographic and enzymatic data suggest that enzymatic infarct size estimates utilizing accumulated CK-MB release may be a valid and reliable clinical measure for assessing the extent of LV necrosis in the setting of acute anterior myocardial infarction. However, limitations may exists in certain cases of inferior MI, probably because of concomitant right and left ventricle necrosis.

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