Abstract
Serum levels of creatine kinase (CK) isoenzymes (MM, MB, and BB) were measured by sensitive enzyme immunoassay (EIA) methods in 50 patients with Duchenne muscular dystrophy (DMD) and in 39 controls. MM, MB, and BB levels in DMD patients were higher than in controls, and these three levels decreased with advancing age of DMD patients. Serum MB levels showed a good correlation with serum levels of carbonic anhydrase III (CA-III), but correlated poorly with electrocardiographic findings, suggesting that the main origin of serum MB in DMD is skeletal muscle rather than cardiac muscle.
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