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Ann Thorac Surg 1984;37:398-403
© 1984 The Society of Thoracic Surgeons

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Articles

Early Results of Valve Replacement with the Björk-Shiley Convexoconcave Prosthesis

Departments of Surgery and Biostatistics, School of Medicine, the University of Alabama in Birmingham, Birmingham, AL

Accepted for publication September 15, 1983.

^* Address reprint requests to Dr. Kouchoukos, 1318 19th St S, Birmingham, AL 35205

The Björk-Shiley convexoconcave prosthetic valve has design characteristics that may result in a lower incidence of thromboembolic complications than the conventional spherical Björk-Shiley prosthesis. We evaluated the results of valve replacement with the convexoconcave prosthesis in 248 patients receiving 301 prosthetic valves between March, 1979, and June, 1981. One hundred thirteen patients had aortic valve replacement (AVR), 73 had mitral valve replacement (MVR), and 62 had multiple valve replacement. Two hundred nine (84%) were in New York Heart Association Class III or IV. The median duration of follow-up was 13 months, and follow-up information was available for 246 (99%) of the patients. The actuarial incidence of freedom from thromboembolism at two years was 98% in the AVR group, 97% in the MVR group, and 87% in the group having multiple valve replacement. There were no documented episodes of valve thrombosis or mechanical failure and no fatal thromboembolic complications. The absence of valve thrombosis is in marked contrast to the results reported with the spherical disc valve. Although longer follow-up is necessary, it appears that the convexoconcave design represents a major improvement in the Björk-Shiley prosthesis.

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