Enzymatic indices of myocardial necrosis: influence on short- and long-term prognosis after myocardial infarction

Circulation
P L ThompsonV Katavatis

Abstract

The prognostic effect of the peak level of serum creatine kinase (CK) and aspartate transaminase (AST), estimated daily for 3--5 days after acute myocardial infarction, was studied in 560 patients who survived the first day in hospital. In a subgroup of 54 patients, peak enzyme levels correlated well with the cumulated CK release (r = 0.90 with peak CK, r = 0.74 with peak AST), thus reflecting the extent of myocardial necrosis. Total mortality within a year after infarction was not significantly different in the lower three quintiles of peak serum enzyme level, but increased from 15.5% to 27.9% (p less than 0.001) when peak CK level exceeded eight times the upper limit of normal (8 X N) and form 13.1% to 34.8% (p less than 0.001) when peak AST level exceeded five time the upper limit of normal (5 X N). The effect of high enzyme levels was more marked in patients with a prior history of myocardial infarction; mortality increased from 14.7% for first infarctions to 18.2% for recurrent infarctions, with peak CK greater than 8 X N, and from 27.0% for first infarctions to 38.0% for recurrent infarctions with peak CK greater than 8 X N. Early mortality was more significantly affected (p less than 0.0001) than late mortality (p less t...Continue Reading

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