[Porcine valvular bioprosthesis. Results 6 years later].

Between January, 1977 and December, 1980, 128 porcine bioprostheses were implanted in 109 European patients hospitalized at the Boucicaut hospital, Paris: 47 were aortic valve replacements (AVR), 43 mitral valve replacements (MVR) and 19 dual valve replacements (DVR). The operative mortality rate was 11% (12 patients): MVR 21%, AVR 6.4%, DVR 0%. 3 patients were lost sight of. The mean follow-up period was 59.3 months (3-96 months). The overall survival rate at 6 years, including early deaths, was 74.4 +/- 8%: MVR 66.1 +/- 15%, AVR 84.9 +/- 10%, DVR 68.6 +/- 20%. Eighteen late deaths were reported (3.7% patient-years [PY]), 3 of which were due to the valve (0.6% PY). The probability at 6 years of escaping death due to the valve was 96.3 +/- 4%: MVR 96.9 +/- 4%, AVR 100%, DVR 87 +/- 17%. Complications associated with the valve were observed in 17 patients (3.5% PY); they were: degeneration in 2 (0.8% PY), thromboembolic accident in 2 (0.4% PY), haemorrhagic accident in 4 (0.8% PY), endocarditis in 5 (1% PY) and simple disinsertion in 2 (0.4% PY). The probability at 6 years of escaping a complication due to the valve was 80.7 +/- 10%: MVR 90.4 +/- 13%, AVR 81.8 +/- 13%, DVR 55.3 +/- 35%. The probability at 6 years of escaping death and re-operation due to the valve was 88.5 +/- 8%: MVR 96.0 +/- 6%, AVR 87.9 +/- 11%, DVR 60.2 +/- 37%. This study and those already published show that compared with mechanical prostheses, bioprostheses clearly reduce the incidence of thromboembolic and haemorrhagic accidents.(ABSTRACT TRUNCATED AT 250 WORDS)