[Myoglobin test in the diagnosis of focal changes in the myocardium of patients with unstable angina].

Increased serum myoglobin levels were detected by radioimmunoassay in 57 (71.8%) of 80 patients with unstable angina. Transitory hypermyoglobinemia is an earlier and more informative test, as compared to ECG records or enzyme assays, for the diagnosis of focal myocardial changes resulting from a prolonged anginal attack in patients with unstable angina.