Related Experiment Videos
Annular remodeling in chronic ischemic mitral regurgitation: ring selection implications.
Frederick A Tibayan1, Filiberto Rodriguez, Frank Langer
1Department of Cardiovascular and Thoracic Surgery, Stanford University School of Medicine, Stanford, California, USA.
The Annals of Thoracic Surgery
|November 7, 2003
Summary
Chronic ischemic mitral regurgitation causes significant annular remodeling, increasing diameters and perimeters while decreasing annular height. These findings guide mitral repair strategies for better leaflet coaptation.
Area of Science:
- Cardiovascular Research
- Medical Engineering
- Cardiac Surgery
Background:
- Understanding annular remodeling in chronic ischemic mitral regurgitation is crucial for improving annuloplasty techniques.
- Current three-dimensional (3D) in vivo data on these geometric changes are limited.
- This study investigates 3D mitral annular distortions in a chronic myocardial infarction model.
Purpose of the Study:
- To determine the 3D distortions of the mitral annulus in chronic ischemic mitral regurgitation.
- To provide data for optimizing annuloplasty ring selection and design of new repair techniques.
Main Methods:
- Utilized an ovine model of chronic myocardial infarction.
- Implanted radiopaque markers on the left ventricle and mitral annulus.
- Used biplane cinefluoroscopy for 3D marker data acquisition before and after infarction induction.
Main Results:
- Mitral regurgitation severity increased significantly.
- Septal-lateral and commissure-commissure annular diameters and annular perimeters (muscular and fibrous) increased.
- Annular saddle horn height decreased, indicating flattening.
Conclusions:
- The study provides 3D in vivo data on annular remodeling in chronic ischemic mitral regurgitation.
- Mitral repair should focus on preventing intertrigonal distance lengthening.
- Strategies should aim to reduce septal-lateral diameter and restore annular saddle shape for improved leaflet coaptation.