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Ischemic mitral regurgitation: when and how should it be corrected?
1Department of Thoracic and Cardio-Vascular Surgery, Cliniques Universitaires Saint Luc, Universitè Catholique de Louvain, Brussels, Belgium.
The Journal of Heart Valve Disease
|September 1, 1993
Summary
Ischemic mitral regurgitation, affecting 4% of bypass surgery patients, significantly impacts survival if uncorrected. Annuloplasty can correct it, preserving papillary muscle continuity is key if replacement is needed.
Area of Science:
- Cardiovascular Surgery
- Cardiac Surgery
- Valvular Heart Disease
Background:
- Ischemic mitral regurgitation (IMR) affects approximately 4% of patients undergoing coronary bypass surgery.
- Significant IMR negatively impacts hospital mortality and long-term survival, even with successful revascularization.
- IMR is often associated with right coronary and/or circumflex artery disease.
Purpose of the Study:
- To investigate the mechanisms, diagnostic indicators, and management strategies for ischemic mitral regurgitation.
- To highlight the prognostic implications of uncorrected IMR in patients undergoing coronary bypass surgery.
Main Methods:
- Analysis of patient data from coronary bypass surgery.
- Assessment of IMR mechanisms including leaflet motion restriction and mitral annulus dilatation.
- Utilizing heart catheterization, transesophageal echocardiography, and LV volume loading tests for diagnosis and decision-making.
Main Results:
- Mitral annulus dilatation is a universal finding in IMR, serving as the sole mechanism in 50% of cases.
- Restricted leaflet motion is more common than prolapse as a cause of IMR.
- Transesophageal echocardiography and LV volume loading tests refine surgical indications for moderate or intermittent IMR.
Conclusions:
- Prompt recognition and management of IMR are crucial for improving patient outcomes after coronary bypass surgery.
- Mitral valve annuloplasty is an effective treatment for the majority of IMR cases.
- In cases requiring mitral valve replacement, preserving papillary muscle-annulus continuity is recommended.