Goetz, W. A. and Lim, H. S. and Lansac, E. and Weber, P. A. and Birnbaum, D. E. and Duran, C. M. G. (2003) The aortomitral angle is suspended by the anterior mitral basal "stay" chords. THORACIC AND CARDIOVASCULAR SURGEON, 51 (4). pp. 190-195. ISSN 0171-6425
Full text not available from this repository. (Request a copy)Abstract
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 in-crease of distance M1-T1 and M2-T2. Consequently, the AMA narrowed at end systole by -3.26+/-0.85degrees (p<0.05) and at end diastole by -4.16+/-1.28degrees, (p<0.05). A force of 1.8+/-0.2N 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 FF and-constitute the center of the LV base. Transection of SC narrows AMA and increases the risk of SAM.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | VALVE REPLACEMENT; MORPHOLOGY; DYNAMICS; ANATOMY; aortomitral angle; mitral valve; anterior basal chordae tendinae; stay chords; sonomicrometry |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Herz-, Thorax- und herznahe Gefäßchirurgie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 06 Sep 2021 08:18 |
| Last Modified: | 06 Sep 2021 08:18 |
| URI: | https://pred.uni-regensburg.de/id/eprint/38802 |
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