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In recent years, captopril has attracted considerable clinical attention as an agent for use in treating heart failure. We administered 15 mg/kg of captopril or 1.5 mg/kg of enalapril to 5-week-old J-2-N cardiomyopathic hamsters for 10 or 15 weeks, and investigated the roles of the renin-angiotensin-aldosterone and kallikrein-kinin systems in the onset and progress of cardiomyopathy. In the untreated group, serum creatine kinase levels increased in accordance with the progression of cardiomyopathy, but this increase was markedly inhibited by the administration of captopril. The rise in serum aldolase levels was similarly inhibited. Serum malondialdehyde levels were significantly reduced by the administration of captopril. ECG findings and the ventricular myosin isoenzyme pattern were also markedly improved by captopril. The improvement in all these parameters was less with enalapril. These differences between captopril and enalapril suggest that increases in tissue bradykinin and vasodilatory prostaglandins may play an important role in the beneficial effects of captopril.

The effects of angiotensin converting enzyme inhibitors and the role of the Renin-Angiotensin-Aldosterone system in J-2-N cardiomyopathic hamsters.