SUMMARY SERUM LACTIC DEHYDROGENAZE, PROGESTERONE AND TESTESTERON LEVELS IN ACUTE MYOCARDIAL INFARCTION In order to study the predisposing effects of sex hormones in acute myocardial infarction, plasma lactic dehydrogenaze (LDH), progesteron and testesteron levels were studied in 26 male patients who had acute myocardial infarction and 15 age-matched controls. Mean serum LDH level was significantly elevated in patient group (p 0.05). There was no significant difference in testesteron levels between two groups (p >0.05). Serum LDH Levels were significantly and positively correlated with serum progesteron levels in the first day of myocardial infarction (r=0.43, p 0.05). Serum testesteron düzeyleri bakımından hasta ve kontrol grubu arasında önemli farklılık bulunamadı (p>0.05). Akut miyokard infarktüsünde serum LDH düzeyi ile progesteron arasında önemli pozitif bir korelasyon varken (r=0.43). Serum LDH ile serum testesteron düzeyleri arasında önemli bir korelas¬yon yoktu (r=0.35).