A 66-year-old woman had a myocardial infarction. Laboratory testing performed 12 hours after the onset of symptoms disclosed elevated blood concentrations of
A. cytochrome oxidase
B. catalase
C. superoxide dismutase
D. xanthine oxidase
E. creatine kinase
E
Creatine kinase, an enzyme found in muscle cells, is released from injured muscle cells. It occurs in two isoforms: isoenzyme creatine kinase MB is found in the myocardial cells and is useful for diagnosing myocardial infarcts. The isoenzyme MM is found in the skeletal muscle cells and is elevated in blood after muscle injury or in patients who have myositis.
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