Weidler, 1974;Weintraub and McHenry, 1974).The lack of specificity of serum enzyme tests in confirming the myocardial damage has so far been a deterrent. Recent improvements in determination of heart type creatine kinase isoenzyme (CK MB) have made it possible to disclose myocardial damage (Roe et al., 1972;Somer and Konttinen, 1972).In a preliminary study concerning the release of brain type creatine kinase isoenzyme from brain to blood in acute cerebral disorders (Somer et al., 1975) we also found CK MB isoenzyme in the serum of many such patients. We, therefore, decided to study how often it can be found in various acute cerebral disorders, and whether its presence would have any prognostic significance. 'Present address:
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