Long-term (up to 18 years) clinical and echocardiographic results of mitral balloon valvuloplasty in 531 consecutive patients and predictors of outcome.

Objectives: The study aim was to assess the long-term results (up to 18 years) of mitral balloon valvuloplasty (MBV) and to identify predictors of restenosis and event-free survival.

Methods: The immediate and long-term results for 531 consecutive patients (mean age 31 +/- 11 years) who underwent successful MBV and were followed up for a mean of 8.5 +/- 4.8 years (range: 1.5-18 years) are reported.

Results: The mitral valve area (MVA) increased from 0.92 +/- 0.17 to 1.95 +/- 0.29 cm(2) (p < 0.0001). Restenosis was 31 and 19% in patients with mitral echocardiographic score (MES) < or =8. Actuarial freedom from restenosis at 10, 15 and 18 years was 77 +/- 2, 46 +/- 3 and 18 +/- 4% and 86 +/- 2, 62 +/- 4 and 31 +/- 7% for MES < or =8, respectively (p < 0.001). Event-free survival (death, redo MBV, mitral valve replacement, NYHA class III or IV) at 10, 15 and 18 years was 88 +/- 1, 53 +/- 4, and 21 +/- 5% and 93 +/- 2, 65 +/- 5 and 38 +/- 8% for MES < or =8, respectively (p < 0.001). Multivariable Cox regression analysis identified MES >8 (p < 0.0001) and previous surgery (p = 0.043) as predictors of restenosis, and MES >8 (p < 0.0001) and baseline atrial fibrillation (p = 0.03) as predictors of combined events.

Conclusion: MBV provides excellent long-term results. The baseline clinical and MES characteristics are predictors of outcome.