Document Detail


Quantification and localization of mitral valve tenting in ischemic mitral regurgitation using real-time three-dimensional echocardiography.
MedLine Citation:
PMID:  17329114     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: Ischemic mitral regurgitation (IMR) results from a variable combination of annular dilatation and remodeling of the subvalvular apparatus. Current surgical techniques effectively treat annular dilatation, but methods for addressing subvalvular remodeling have not been standardized. An effective technique for determining the extent of subvalvular remodeling could improve surgical results by identifying patients who are unlikely to benefit from annuloplasty alone. METHODS: A well-characterized ovine model of IMR was employed. Real-time three-dimensional echocardiography was performed on each animal at baseline, immediately after infarction and 8 weeks after infarction. Intercommissural width and mitral annular area were calculated for each subject at each time point. Mitral valve tenting area and height were calculated at discrete intervals along the entire intercommissural axis. The location at which maximal tenting area and height occurred was recorded. Mitral valve tenting volume was calculated by summation. RESULTS: Both immediate and long-term increases were observed in mean intercommissural width and mean mitral annular area (from 33.2 to 36.3 to 39.7 mm and from 740 to 810 to 1020 mm(2), respectively). Both immediate and long-term increases were observed in maximum mitral valve tenting area and height (from 38.5 to 50.6 to 112.1mm(2) and from 3.9 to 4.7 to 10.1mm, respectively). Mitral valve tenting area and height at the mid-point of the intercommissural axis did not change significantly during the observation period. The position along the intercommissural axis at which maximal mitral valve tenting area and height occurred shifted progressively toward the anterior commissure (from 51.8% to 45.1% to 38.9% and from 52.9% to 45.1% to 37.8%). Both immediate and long-term increases were observed in mitral valve tenting volume (from 474.0 to 622.1 to 1483.5mm(3)). CONCLUSIONS: We have described a technique that utilizes real-time three-dimensional echocardiography to perform a comprehensive assessment of leaflet tethering on the entire mitral valve. Our methodology is not influenced by viewing plane selection, regional tenting asymmetry, or annular dilatation and, therefore, represents a potentially useful surrogate measure of subvalvular remodeling.
Authors:
Liam Ryan; Benjamin Jackson; Landi Parish; Hiroaki Sakamoto; Theodore Plappert; Martin St John Sutton; Joseph Gorman; Robert Gorman
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2007-02-27
Journal Detail:
Title:  European journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery     Volume:  31     ISSN:  1010-7940     ISO Abbreviation:  Eur J Cardiothorac Surg     Publication Date:  2007 May 
Date Detail:
Created Date:  2007-04-09     Completed Date:  2007-07-19     Revised Date:  2007-12-03    
Medline Journal Info:
Nlm Unique ID:  8804069     Medline TA:  Eur J Cardiothorac Surg     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  839-4     Citation Subset:  IM    
Affiliation:
Harrison Department of Surgical Research, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-4283, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Cardiac Surgical Procedures / methods
Dilatation, Pathologic
Disease Models, Animal
Echocardiography, Three-Dimensional / methods*
Image Processing, Computer-Assisted / methods
Male
Mitral Valve / pathology,  surgery,  ultrasonography
Mitral Valve Insufficiency / pathology,  surgery,  ultrasonography*
Myocardial Ischemia / pathology,  surgery,  ultrasonography*
Sheep
Ventricular Dysfunction, Left / ultrasonography
Ventricular Remodeling / physiology
Grant Support
ID/Acronym/Agency:
HL63954/HL/NHLBI NIH HHS; HL73021/HL/NHLBI NIH HHS; HL76560/HL/NHLBI NIH HHS

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


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