An examination of 400 coronary patients demonstrated a relationship between increased serum CPK, AST, LDH and LDH-1, and the spread and severity of myocardial infarction (MI). In transmural and large-focal MI, CPK activity peak observed on Day 1-2 of the disease was increased 4-12-fold, and that of AST, 5-fold, as compared to the upper limit of the normal range. In small-focal and subendocardial MIs, the increase was 1.5-8-fold and 3-fold, respectively. In angina pectoris, serum CPK activity also showed an increase, although a less manifest one. A CPK activity level of 175 IU is proposed as a discriminative level to be used in the diagnosis of large-focal myocardial infarctions.
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