Document Detail

Role of annulus tension in annular dilatation.
MedLine Citation:
PMID:  20099687     Owner:  NLM     Status:  MEDLINE    
BACKGROUND AND AIM OF THE STUDY: Mitral annulus mechanics are related to annular dilatation, and are not well understood. The study aim was to develop a method to measure regional annulus tension (AT) during valve closure, and to understand its role in annular dilatation. METHODS: A porcine mitral valve was harvested and mounted on a mitral valve closure test rig with the papillary muscles held in the normal position. The mitral valve annulus tissue rested on a plastic ring on which it was able to slide freely, there being no restriction in the interface between the annulus and the ring. The annulus was pulled by strings in the periphery during valve closure under a hydrostatic trans-mitral pressure. The string tensions were measured and further divided by string spacing to obtain the AT. A total of 10 mitral valves was tested. RESULTS: The AT distribution along the anterolateral annulus exhibited a concave curve. The anterior, commissural and posterior ATs were 40.0, 17.8, and 30.6 N/m, respectively, and the trans-mitral pressure 120 mmHg. The ATs in the three sections of the annulus were significantly different. CONCLUSION: A novel method to measure AT has been developed successfully. The AT was lower in the commissural section of the annulus than in the anterior or posterior sections. This finding may suggest that the potential for annular dilatation in the commissural section is high.
Shamik Bhattacharya; Zhaoming He
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of heart valve disease     Volume:  18     ISSN:  0966-8519     ISO Abbreviation:  J. Heart Valve Dis.     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2010-01-26     Completed Date:  2010-03-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9312096     Medline TA:  J Heart Valve Dis     Country:  England    
Other Details:
Languages:  eng     Pagination:  481-7     Citation Subset:  IM    
Department of Mechanical Engineering of the Texas Tech University, Lubbock, Texas, USA.
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MeSH Terms
Mitral Valve / physiology*
Models, Cardiovascular
Muscle Tonus / physiology*
Papillary Muscles / physiology
Stress, Mechanical

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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