Mitral valve replacement after closed mitral commissurotomy

Area of Science:

• Cardiology
• Cardiac Surgery
• Valvular Heart Disease

Background:

• Acquired isolated mitral stenosis is a significant valvular heart disease.
• Closed mitral commissurotomy (CMC) has been a historical treatment option.
• Long-term outcomes and predictors of reintervention after CMC require evaluation.

Purpose of the Study:

• To evaluate the long-term efficacy and outcomes of closed mitral commissurotomy (CMC) for acquired isolated mitral stenosis.
• To identify factors associated with the need for subsequent mitral valve replacement (MVR).
• To assess the outcomes of MVR in patients who previously underwent CMC.

Main Methods:

• Retrospective analysis of 303 patients who underwent CMC between 1954 and 1980.
• Assessment of hemodynamic parameters (mitral valve gradient, valve area index) and functional class before and after CMC.
• Actuarial survival analysis and identification of predictors for late MVR.

Main Results:

• CMC significantly reduced mitral valve gradient and increased valve area index (p < 0.001).
• 92% of patients improved functional class post-CMC, with 5, 10, and 15-year survival rates of 95%, 82%, and 70%.
• 18% of patients required MVR due to restenosis or residual stenosis; MVR also provided significant clinical improvement and survival benefits.

Conclusions:

• Closed mitral commissurotomy (CMC) offers excellent long-term hemodynamic and clinical benefits for selected patients with mitral stenosis.
• Preoperative and early postoperative factors predict the need for late mitral valve replacement (MVR).
• Mitral valve replacement (MVR) is an effective option for patients experiencing symptomatic deterioration after CMC.