Troponin T and histological characteristics of rat myocardial infarction induced by isoproterenol

TIn out investigation,we used Short-time model of myocardial infarction of rats induced by high close of isoproterenol (ISP). We investigated cardiac troponin T blood level (cTnT) and histological characteristics of rat myocardium. ISP, single, intraperitoneal dose 250 mg/kg was given to male, adult, Wistar rats (n - 12). Rats were distributed depending on their body weight in sugroups: ISP I (BW 260-280g) and ISP II (BW 250-400g). Control group (n = 9) was treated with intraperitoneal dose of 0.95% NaCl. Cardiac TnT was measured by electrochemiluminiscene (ECLA) sandwich immunoassay in rat serum 4 hours after ISP application. Rats hearts were dissected and examined by qualitative histological method (H F). Statistical significance was set at 0.05. There was significant difference in CTnT of ISP II (p = 0,0001) vs. control and ISP I (p < 0,05) vs. Control. Significant was between ISP I and ISP II subgroups (p < 0.001). The accent of histological changes of myocardium was on nuclei of cell. Cells showed acydophilic changes and nuclei disappearance as signs of coagulative necrosis development. Extensivity of histological changes were different between ISP I and ISP II subgroup. Used dose of ISP induced development of myocardial necrosis in rats. Subendocardial portion of myocardium was more vulnerability than subepicardial portion. Rats of ISP II had more extensive histological changes than these in ISP I. Administered doses of ISP enabled cTnT utilization as it market of myocardial necrosis.