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Ann Thorac Surg 1980;30:230-239
© 1980 The Society of Thoracic Surgeons

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Articles

Stresses of Natural versus Prosthetic Aortic Valve Leaflets in Vivo

From the Departments of Surgery and Anatomy, University of Virginia Medical Center, Charlottesville, VA

Accepted for publication January 30, 1980.

^* Address reprint requests to Dr. Thubrikar, Box 263, Surgical Research Laboratory, University of Virginia Medical Center, Charlottesville, VA 22908

	Abstract

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During normal function of the aortic valve, the aortic leaflets undergo not only cyclic loading and unloading but also cyclic reversal of their curvature. The stresses induced in the leaflet due to these variations have been computed using a new concept based on the structure of the leaflet. Membrane stresses have been related to the pressure difference across the leaflet and bending stresses to the leaflet curvature. Total stresses were obtained by adding the two stresses. Total stresses in bioprosthetic and synthetic leaflets also were computed using the same approach. In systole, the natural leaflet is subjected to much lower total stress than a bioprosthetic or a synthetic leaflet. The natural leaflet is not subjected to compressive stresses during the cardiac cycle, whereas bioprosthetic and synthetic leaflets must sustain compressive stresses during systole. The differences in stress patterns of these leaflets indicate that there is a difference in their longevity.

	Footnotes

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Supported by Grants HL-17969 and HL-16935 from the National Institutes of Health.

Presented at the 31st Annual Conference on Engineering in Medicine and Biology, Oct 21–25, 1978, Atlanta, GA.

	References

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8. Swanson WM, Clark RE: Motion and stresses in aortic valve leaflets during systole. Am Soc Mechanical Engineers Publication No. 72-WA/BHF-5, Nov, 1972.
9. Swanson WM, Clark RE. Dimensions and geometric relationships of the human aortic valve as a function of pressure Circ Res 1974;35:871.[Abstract/Free Full Text]
10. Thubrikar M, Bosher LP, Nolan SP. The mechanism of opening of the aortic valve J Thorac Cardiovasc Surg 1979;77:863.[Abstract]
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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Personal Folders Download to citation manager Permission Requests Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Thubrikar, M. Articles by Nolan, S. P. Search for Related Content PubMed PubMed Citation Articles by Thubrikar, M. Articles by Nolan, S. P.