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Ann Thorac Surg 2001;71:S261-S264
© 2001 The Society of Thoracic Surgeons
a Cardiac Surgery Service, CHU Timone, Marseille, France
Address reprint requests to Dr Caus, Cardiac Surgery Service, CHU Timone, Bd Jean Moulin, 13385 Marseille, France
e-mail: tcaus{at}ap-hm.fr
Presented at the VIII International Symposium on Cardiac Bioprostheses, Cancun, Mexico, Nov 35, 2000.
Background. We previously showed that the risk of reoperation for structural degeneration of bioprostheses was higher in cases involving patients older than 65 years (p = 0.003) and double-valve replacement (p = 0.02). The purpose of this study was to compare late outcome of mitral-aortic valve replacement using bioprostheses or mechanical valves.
Methods. The bioprosthesis group included all mainland France residents (n = 48) between 55 and 65 years old operated on between 1980 and 1995 for mitral-aortic valve replacement using bioprostheses. The mechanical valve group was obtained by matching each of these patients with a patient operated on using mechanical valves at approximately the same time during the study.
Results. In the bioprosthesis group, 10-year survival was 45% ± 8% versus 62% ± 7% in the mechanical valve group (not significant). The linearized reoperation rate was 6.8 per patient-year versus 1.1 per patient-year (p = 0.001), and the linearized reoperative mortality rate was 1.8 per patient-year and 0.7 per patient-year (not significant), respectively.
Conclusions. The reoperative mortality risk after mitral-aortic valve replacement using two bioprostheses does not significantly decrease overall survival after age 65 years.
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