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Clinical Chemistry 34: 898-901, 1988;
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Clinical Chemistry, Vol 34, 898-901, Copyright © 1988 by American Association for Clinical Chemistry

Creatine kinase MB in cases of skeletal muscle trauma

JG Schwartz, TJ Prihoda, JH Stuckey, CL Gage and ML Darnell
Department of Pathology, University of Texas Health Science Center, San Antonio 78284-7750.

Fifty-eight patients admitted through our emergency room with severe skeletal muscle injury but no obvious cardiac contusions were evaluated for creatine kinase isoenzyme MB (CK-MB). When such patients show an above-normal value for total CK, it is a question of whether or not myocardial injury has been sustained along with skeletal muscle injury when (a) there are no obvious chest contusions or (b) the patient is unconscious and unable to complain of chest pain. Whenever there is doubt concerning the cardiac status of a patient, lactate dehydrogenase (LD) isoenzymes, serial electrocardiograms, and CK isoenzymes are ordered. Our study revealed that serum of 8.6% of the trauma victims had CK-MB values exceeding 5.0 EU/L (reflecting abnormal CK-MB concentrations) as part of their increased total CK. All patients had normal electrocardiographic patterns along with negative results for LD isoenzymes; none had sustained any demonstrable myocardial injury. The CK-MB value must be interpreted together with the total CK value for appropriate diagnosis in patients with skeletal muscle trauma.


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Copyright © 1988 by the American Association for Clinical Chemistry.