Document Detail

The aortomitral angle is suspended by the anterior mitral basal "stay" chords.
MedLine Citation:
PMID:  14502455     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: The function of the anterior mitral basal "stay" chords (SC) is not yet known. Collagen fiber orientation of the anterior mitral leaflet (AML) suggests that local stress is directed from papillary muscles (PM) over SC and AML to fibrous trigones (FT), maintaining the aortomitral angle (AMA). It has been shown that narrowing of AMA increases risk of systolic anterior movement (SAM). METHODS: Sonomicrometry crystals were implanted in six sheep at the left ventricular (LV) apex, PM tips (M1, M2), FT (T1, T2), posterior mitral annulus (PMA), and base of aortic right coronary sinus (RCS). The retracting force of ascending aorta was measured. RESULTS: Transection of SC resulted in an increase of distance M1-T1 and M2-T2. Consequently, the AMA narrowed at end systole by -3.26+/-0.85 degrees (p<0.05) and at end diastole by -4.16+/-1.28 degrees (p<0.05). A force of 1.8+/-0.2 N was needed to pull the recoiling ascending aorta back to its original position. CONCLUSIONS: The elastic recoil of ascending aorta is balanced by SC, which connect PM to FT and constitute the center of the LV base. Transection of SC narrows AMA and increases the risk of SAM.
W A Goetz; H-S Lim; E Lansac; P A Weber; D E Birnbaum; C M G Duran
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Thoracic and cardiovascular surgeon     Volume:  51     ISSN:  0171-6425     ISO Abbreviation:  Thorac Cardiovasc Surg     Publication Date:  2003 Aug 
Date Detail:
Created Date:  2003-09-22     Completed Date:  2004-02-12     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7903387     Medline TA:  Thorac Cardiovasc Surg     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  190-5     Citation Subset:  IM    
Klinik für Herz-, Thorax- und herznahe Gefässchirurgie, Klinikum der Universität Regensburg, Germany.
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MeSH Terms
Aorta / anatomy & histology,  physiology*
Mitral Valve / anatomy & histology,  physiology*
Myocardial Contraction
Papillary Muscles / anatomy & histology,  physiology

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