During 6 year period from January, 1987 through December, 1992, a total of 17 valvular reoperations [14 mitral and 3 aortic valve reoperations] were performed in 15 patients with previously implanted prosthetic valves. There were 7 men and 8 women, mean age was 35.4 years. Mean time interval was 80 months. Causes for reoperations were prosthetic valve failure, prosthetic valve endocarditis, and periprosthetic leak.3 patients died in hospital. The cause of death were low cardiac output and acute renal failure.