Clinical Chemistry
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Clinical Chemistry 34: 1096-1098, 1988;
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Clinical Chemistry, Vol 34, 1096-1098, Copyright © 1988 by American Association for Clinical Chemistry

Atypical patterns of lactate dehydrogenase isoenzymes in acute myocardial infarction

Z Rotenberg, I Weinberger, E Davidson, J Fuchs, O Sperling and J Agmon
Department of Medicine A, Israel and Ione Massada Center for Heart Diseases, Tel Aviv.

Total lactate dehydrogenase (LD; EC 1.1.1.27) activity in serum and LD isoenzymes were quantified in 190 patients with acute myocardial infarction (AMI) 24, 48, and 72 h after admission. In 90% of the 570 blood specimens an LD isoenzyme pattern typical of AMI (LD-1/LD-2 greater than 0.76) was found. The other 56 blood specimens showed an LD isoenzyme pattern atypical of AMI (LD-1/LD-2 less than 0.76). They were divided into three groups: 28 specimens with isomorphic pattern (relative increase in all five LD isoenzymes); 18 with relatively increased LD-3 proportion (greater than 35%); and 10 specimens with increased LD-5 proportion (greater than 10%). No difference was found in mean total LD activity in serum between the typical isoenzyme group and the three atypical groups. The LD isomorphic pattern was found in 60% of AMI patients complicated by cardiogenic shock. Fifty percent of AMI patients admitted with pulmonary edema showed increased LD-3 proportion and half of the patients with AMI and congestive heart failure, predominant right, demonstrated increased LD-5 proportion. We conclude that although most patients with AMI present at diagnosis with a typical LD isoenzyme pattern, it is important to recognize that some may present with atypical LD isoenzyme patterns, which may be associated with specific AMI complications.




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Copyright © 1988 by the American Association for Clinical Chemistry.