Benefits of Early Surgery on Clinical Outcomes After Degenerative Mitral Valve Repair.

BACKGROUND

This study aimed to evaluate the clinical trends of mitral valve repair for degenerative mitral regurgitation and the benefit of early surgical intervention on repair durability in a high-volume center.

METHODS

From January 2003 to December 2015, 1,903 consecutive patients with severe degenerative mitral regurgitation underwent mitral valve repair at our institution. The timing of surgical intervention was evaluated by guideline-related indications including symptoms, atrial fibrillation, left ventricular dysfunction, and pulmonary hypertension. Clinical outcomes and risk factors for recurrent mitral regurgitation were analyzed.

RESULTS

Over 13 years from 2003 to 2015, trends of preoperative characteristics demonstrated that the proportion of asymptomatic patients substantially increased. The 8-year overall survival, freedom from reoperation for mitral valve, and freedom from recurrent mitral regurgitation were 96%, 96%, and 85%, respectively. Ejection fraction less than 60%, left ventricular end-diastolic dimension greater than 60 mm, isolated anterior leaflet lesion, and intraoperative mild residual mitral regurgitation were independent predictive factors for recurrent mitral regurgitation. The incidence of recurrent mitral regurgitation was significantly lower in the early intervention group (3% versus 18%, p < 0.01). In subgroup analysis of asymptomatic patients, the incidence of recurrent mitral regurgitation was significantly lower in patients without guideline-related indications (3% versus 31%, p < 0.0001).

CONCLUSIONS

Early surgical intervention for severe degenerative mitral regurgitation before symptoms, atrial fibrillation, and ventricular dysfunction are associated with excellent clinical outcomes. Besides complexity of leaflet lesion and repair quality, surgical timing also significantly affects repair durability. Early surgical intervention should therefore be recommended to reduce recurrent mitral regurgitation.