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Ann Thorac Surg 1988;45:66-70
© 1988 The Society of Thoracic Surgeons

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Articles

Incidence of Primary Tissue Valve Failure in Porcine Bioprosthetic Heart Valves

From the Servicio de Cirugia Cardiovascular and Departamento de Anatomia Patológica, Hospital Nacional Marqués de Valdecilla, Facultad de Medicina, Universidad de Cantabria, Santander, Spain

Accepted for publication August 26, 1987.

^* Address reprint requests to Dr. Gallo, P.O. Box 1054, 39080 Santander, Spain

This report provides retrospective follow-up data on 324 consecutive patients who received a Hancock-I porcine valve in the aortic or the mitral position, or in both positions, between June, 1974, and December, 1976. This analysis included 319 valves (193 mitral, 126 aortic) available for study of the incidence of primary tissue valve failure after 10 to 12.5 years of follow-up. Of the 319 prostheses at risk, 114 instances of primary tissue valve failure occurred. Seventy-three of the failed valves were in the mitral position, and 41 were in the aortic position. The calculated actuarial probability of freedom from primary tissue valve failure was 52 ± 5% for the mitral and 58 ± 6% for the aortic prostheses at 12.5 years of follow-up. For patients older than 40 years at the time of operation, the rate of freedom from primary failure was 68 ± 8% and 55 ± 6% for aortic and mitral prostheses, respectively, at 12.5 years. Comparison of both actuarial curves disclosed no meaningful difference. However, a tendency toward greater failure rate was observed in the mitral prosthesis group.

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