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Ann Thorac Surg 1988;46:331-336
© 1988 The Society of Thoracic Surgeons

Articles

In Vitro Analysis of Performance of Porcine Xenografts with Inward Bending of Stent Posts: Real-time Measurement of Valve Orifice Area Using an Area Meter

Kazuya Akiyama, M.D.*, Osamu Sawatani, M.D., Eisaburo Imamura, M.D., Hitoshi Koyanagi, M.D., Masafumi Higashidate, M.D., Kouichi Tamiya, M.D.

From the Departments of Cardiovascular Surgery, Pediatric Cardiovascular Surgery, and Surgical Science, The Heart Institute of Japan, Tokyo Women's Medical College, Tokyo, Japan

Accepted for publication March 31, 1988.

* Address reprint requests to Dr. Akiyama, Department of Cardiovascular Surgery, The Heart Institute of Japan, Tokyo Women's Medical College, 8-1 Kawada-cho, Shinjuku-ku, Tokyo 162, Japan.

The influence of inward bending of the stent posts on bioprosthetic valve function was assessed in a hydromechanical simulation of the left heart. A Carpentier-Edwards mitral xenograft (31 mm) and an aortic xenograft (27 mm) were used. Valve function was evaluated before and after the stent posts were bent inward 15 degrees by suture constriction of the tops of the three posts. To evaluate the effects of the stent-post deformity on valve performance, the mean transvalvular pressure drop during steady flow, the bioprosthetic valve orifice area, and the maximum valve opening and closing speeds during pulsatile flow were measured using an area meter. Steady-flow data showed identical transvalvular pressure drops, and no significant difference in valve performance was detected in the pulsatile-flow study under the two experimental conditions (i.e., normal valve and deformed valve). We conclude that a 15-degree inward bending of the stent posts does not appreciably affect valve function in vitro.






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