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Ann Thorac Surg 1979;28:274-280
© 1979 The Society of Thoracic Surgeons

Articles

Dynamic Behavior of Prosthetic Aortic Tissue Valves as Viewed by High-Speed Cinematography

W. Gerald Rainer, M.D.*, Robert A. Christopher, Ph.D., Theodore R. Sadler, Jr., M.D., Alan D. Hilgenberg, M.D.

From the Department of Research, St. Joseph Hospital, Denver, and the Department of Mechanical Engineering, University of Colorado, Boulder, CO.

* Address reprint requests to Dr. Rainer, 2005 Franklin, Suite 700, Denver, CO 80205.

Using a valve testing apparatus of our own design and with a high-speed (600 to 800 frames per second) 16 mm movie camera, films were made of Hancock porcine, Carpentier-Edwards porcine, and Ionescu-Shiley bovine pericardial valves mounted in the aortic position and cycled under physiological conditions at 72 to 100 beats per minute. Fresh and explanted valves were observed using saline or 36.5% glycerol as the pumping solution. When fresh valves were studied using saline solution as the pumping fluid, the Hancock and Carpentier-Edwards porcine valves showed high-frequency leaflet vibration, which increased in frequency with higher cycling rates. Abnormal leaflet motion was decreased when glycerol was used as the blood analogue. The Ionescu-Shiley bovine pericardial valve did not show abnormal leaflet motion under these conditions.

Conclusions drawn from tissue valve testing studies that use excessively high pulsing rates and pressures (accelerated testing) and saline or water as pumping solutions cannot be transposed to predict the fate of tissue valves in a clinical setting.




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