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Techniques and results of mitral valve repair for ischemic mitral regurgitation
1Division of Cardiovascular Surgery, Toronto Hospital, Ontario, Canada.
Abstract:
Mitral regurgitation (MR) may start during the acute phase of myocardial infarction and it may increase, decrease, or remain unchanged as the necrotic muscle is replaced by fibrous tissue and remodeling of the ventricle takes place. Acute infarction can cause MR because of rupture of papillary muscle (PM) head or dysfunction of the PM and underlying ventricular wall. When MR is due to rupture of a single PM head and the surrounding muscle is not extensively infarcted, it is possible to suture the PM head in place with pledget sutures or to use other techniques of repair of flair leaflets such as chordal transfer or chordal replacement. When MR is due to extensive necrosis of the PM and the ventricular wall, it is safer to replace the mitral valve with preservation of the chordae tendineae. Correction of MR by means of valve repair in patients with healed myocardial infarction is frequently possible when the cause of MR is determined by Doppler echocardiography. The most common cause of MR is incomplete closure of the mitral valve due to apical displacement of the PM. Prolapse of the leaflets is rare in patients with healed myocardial infarction. Mitral annuloplasty decreases or abolishes MR in most cases when lack of coaptation of the leaflets is the problem. Transient ischemia can also cause MR. Successful myocardial revascularization either by angioplasty or coronary artery bypass often cures episodic ischemic MR.
Insights
Mitral regurgitation (MR) following myocardial infarction can be treated. Surgical repair or valve replacement, guided by echocardiography, offers effective management for MR caused by heart attack complications.
Area of Science:
- Cardiology
- Cardiac Surgery
- Echocardiography
Background:
- Mitral regurgitation (MR) can develop during acute myocardial infarction (MI) due to papillary muscle (PM) rupture or dysfunction.
- Ventricular remodeling and fibrous tissue replacement following MI can alter the severity of MR.
- Acute MR may result from PM head rupture or PM/ventricular wall dysfunction.
Purpose of the Study:
- To explore the causes and management strategies for mitral regurgitation in the context of myocardial infarction.
- To evaluate the efficacy of different interventions for MR based on its underlying cause post-MI.
Main Methods:
- Review of cases involving mitral regurgitation and myocardial infarction.
- Utilizing Doppler echocardiography to diagnose the specific cause of MR.
- Analysis of surgical techniques including PM repair, valve replacement, and mitral annuloplasty.
Main Results:
- MR due to single PM head rupture can be repaired by suturing or chordal techniques.
- Extensive PM/ventricular necrosis necessitates mitral valve replacement, potentially preserving chordae tendineae.
- Doppler echocardiography guides successful valve repair in healed MI patients, often addressing incomplete leaflet closure due to PM displacement.
Conclusions:
- Mitral regurgitation management post-MI depends on the specific etiology and extent of cardiac damage.
- Valve repair is often feasible for MR in healed MI, particularly when caused by leaflet coaptation issues.
- Myocardial revascularization can resolve transient ischemic MR.