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Restenosis and adverse clinical events after successful percutaneous mitral valvuloplasty: immediate post-procedural mitral valve area as an important prognosticator.

AIMS: We sought to investigate the factors associated with restenosis and its potential association with late clinical deterioration after successful percutaneous mitral valvuloplasty (PMV).

METHODS AND RESULTS: We analysed echocardiographic (median 74 months) and clinical (median 109 months) follow-up data of 329 patients who achieved procedural success, defined as mitral valve area (MVA) > or =1.5 cm(2) and mitral regurgitation (MR) < or =2/4, between 1995 and 2000. Clinical events included cardiovascular death, mitral valve surgery, and repeat PMV. The 1, 3, 5, 7, and 9 year rates of restenosis-free survival were 99 +/- 1%, 97 +/- 1%, 95 +/- 1%, 86 +/- 3%, and 72 +/- 4%, respectively. The 1, 3, 5, 7, and 9 year rates of event-free survival were 99.7 +/- 0.3%, 96.4 +/- 1.0%, 94.5 +/- 1.3%, 90.8 +/- 1.6%, and 90.0 +/- 1.7%, respectively. Immediate post-PMV MVA and commissural MR or splitting, indicators of procedural adequacy, were independent predictors of both restenosis and clinical events. The best immediate post-PMV MVA cut-off value for predicting both restenosis and clinical events within 5 years after successful PMV were 1.8 cm(2) [95% confidence interval (CI) = 1.7-1.9] and 1.9 cm(2) (95% CI = 1.7-2.0), respectively. Patients with immediate post-PMV MVA <1.8 cm(2) showed significantly lower event-free survival rate than those with post-PMV MVA > or =1.8 cm(2) (P < 0.001).

CONCLUSION: Immediate post-PMV MVA> or =1.8 cm(2) was an important predictor of both restenosis- and clinical event-free survival and this value should be considered as a component of optimal result.

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