Creatine kinase isoenzymes in sera and muscle biopsies obtained from 50 controls, 72 patients with progressive muscular dystrophy (PMD), 68 patients with other neuromuscular disorders, 17 carriers of Duchenne-type PMD and 15 patients with myocardial infarction were studied. MB isoenzyme was detected in the sera of 58 patients with PMD and 56 out of 61 muscle biopsies. The MB activity varied between 4 and 400IU/1 or 3.4—22% of total activity. The MB activity was demonstrated in a considerably smaller number of cases with polymyositis, dystrophic myotonia and Kugelberg-Welander disease. The MB isoenzyme in sera of PMD persisted for many years. It is admitted that the MB isoenzyme in the serum of patients with PMD originates chiefly from skeletal muscle.

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