Partial and delayed release of troponin-I compared with the release of lactate dehydrogenase from necrotic cardiomyocytes.

Although the troponins are the serum proteins most frequently used nowadays to diagnose myocardial infarction, controversy continues about whether troponins are released later from infarcted myocardium than the cytoplasmic enzymes used previously, like lactate dehydrogenase (LDH). The present study compared the release kinetics of troponin-I (TnI) and LDH from necrotic cardiomyocytes in vitro. Cardiomyocytes prepared from neonatal rat ventricles were grown for 3 days.