HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) References 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 Author home page(s): Masahiro Endo Akimasa Hashimoto Hitoshi Koyanagi Permission Requests Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Akiyama, K. Articles by Koyanagi, H. Search for Related Content PubMed PubMed Citation Articles by Akiyama, K. Articles by Koyanagi, H.

Ann Thorac Surg 1988;46:73-78
© 1988 The Society of Thoracic Surgeons

---

Articles

Stent Creep of Porcine Bioprosthesis in the Mitral Position

Department of Cardiovascular Surgery, the Heart Institute of Japan, Tokyo Women's Medical College, Tokyo, Japan

Accepted for publication January 19, 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

Stent creep, often associated with valve malfunction, is said to play an important role in the long-term performance of a porcine bioprosthesis. We have measured the angle of the stent post showing maximal inward bending (IBA) on 44 mitral porcine bioprostheses. All of them were explanted 1 to 12 years (mean explant time, 7.8 years) postoperatively at reoperation. Patients included 19 men and 25 women, ranging in age from 24 to 66 years (mean age, 47.2 years). Mean IBA was 12.7 ± 4.2 [SD] degrees in 14 valves implanted for 7 years or less and 16.4 ± 5.8 degrees in 30 valves implanted 8 years or longer (p < 0.05). There was no significant difference in IBA among valves based on type (25 Hancock valves, 15.0 ± 4.7 degrees; 10 Angell-Shiley valves, 16.2 ± 8.6 degrees; and 9 Carpentier-Edwards valves, 14.4 ± 3.7 degrees). There was a significant difference in IBA based on valve size (37 valves measuring 25–29 mm in diameter, 16.3 ± 5.1 degrees; and 7 valves measuring 31 mm in diameter, 9.9 ± 5.1 degrees; p < 0.05). IBA showed a tendency to have a large value in a heart with a small left ventricular end-systolic volume. We conclude that (1) stent creep is not related to the materials or designs of the stent post, but tends to increase with passage of time in place; and (2) compression of the left ventricular wall is one of the main causes of stent-post bending.

This article has been cited by other articles:

				D. D. Glower, W. D. White, A. C. Hatton, L. R. Smith, W. G. Young, W. G. Wolfe, and J. E. Lowe Determinants of reoperation after 960 valve replacements with Carpentier-Edwards prostheses J. Thorac. Cardiovasc. Surg., February 1, 1994; 107(2): 381 - 393. [Abstract] [Full Text]