| Comparison of radial deformability of stent posts of different aortic bioprostheses. | |
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MedLine Citation:
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PMID: 23117234 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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OBJECTIVESLittle is known about the stent deformability required for optimal stented heart valve bioprosthesis design. Therefore, two bioprosthetic valves with known good long-term clinical results were tested. The strain in the radial direction of the stent posts of these valves was compared with contemporary bioprosthetic valves and a native porcine aortic root.METHODSMedtronic Intact and Carpentier-Edwards Standard (CES), and four contemporary bioprostheses, including one self-expanding prosthesis, were tested with three sonomicrometry probes per valve fixed at commissure attachment points. The mean values from 2400 data points from three measurements of the interprobe distances were used to calculate the radius of the circle circumscribed around the three probes. Changes in the radius of the aortic root at pressures 70-90 and 120-140 mmHg (pressure during diastole and systole) and that of the stent posts at 70-90 and 0-10 mmHg (transvalvular pressure gradient during diastole and systole) were compared.RESULTSAn increase in radius by 7.3 ± 2.6, 8.7 ± 0.0 and 3.9 ± 0.0% for the porcine aortic root, CES and Intact valves, respectively, was observed during transition from diastolic to systolic pressure and less for contemporary bioprostheses-mean 2.5 ± 0.9%, lowest 1.2 ± 0.0.CONCLUSIONSThe results indicate that the radial deformability of bioprosthetic valve stent posts can be as low as 1.2% for xenoaortic and 3.0% for xenopericardial prostheses with no compromise of valve durability. Although these results suggest that valve stent post-deformability might not be of critical importance, a concrete answer to the question of the significance of stent deformability for valve durability can be obtained only by acquiring long-term follow-up results for valve prostheses with rigid stents. |
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Authors:
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Martins Kalejs; Romans Lacis; Vladimir Kasyanov; Iveta Ozolanta; Philippe Abdel Sayed; Peteris Stradins; Ludwig Karl Von Segesser |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-11-1 |
Journal Detail:
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Title: Interactive cardiovascular and thoracic surgery Volume: - ISSN: 1569-9285 ISO Abbreviation: Interact Cardiovasc Thorac Surg Publication Date: 2012 Nov |
Date Detail:
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Created Date: 2012-11-2 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101158399 Medline TA: Interact Cardiovasc Thorac Surg Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Riga Stradins University, Riga, Latvia. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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