Very long-term results (up to 17 years) with the double-orifice mitral valve repair combined with ring annuloplasty for degenerative mitral regurgitation

Abstract

The very long-term results of the double-orifice mitral valve repair are unknown. The aim of this study was to assess the late clinical and echocardiographic outcomes of this technique in patients with degenerative mitral regurgitation. From 1993 to 2000, 174 patients with severe degenerative mitral regurgitation were treated with the double-orifice technique combined with ring annuloplasty. Mean age of patients was 52 ± 12.8 years, New York Heart Association class I or II was present in 71% of the patients, atrial fibrillation in 17.2%, and preoperative left ventricular ejection fraction was 59.5% ± 7.5%. Mitral regurgitation was due to anterior leaflet prolapse in 36 patients (20.6%), bileaflet prolapse in 128 (73.5%), and posterior leaflet prolapse in 10 patients (5.7%). There were no hospital deaths. At hospital discharge, mitral regurgitation was absent or mild in 169 patients (97.1%) and moderate (2+/4+) in 5 patients (2.8%). Mitral stenosis requiring reoperation was detected in 1 patient (0.6%). Clinical and echocardiographic follow-up was 97.1% complete (mean length, 11.5 ± 2.53 years; median, 11.6 years; longest duration, 17.6 years). At 14 years, actuarial survival was 86.9% ± 3.37%, freedom from cardiac death was 95.8% ± 1.54%, and freedom from reoperation was 89.6 ± 2.51%. At the last echocardiographic examination, recurrence of mitral regurgitation ≥3+ was documented in 23 patients (23/169, 13.6%). Freedom from mitral regurgitation ≥3+ at 14 years was 83.8% ± 3.39%. The only predictor of recurrence of mitral regurgitation ≥3+ was residual mitral regurgitation greater than mild at hospital discharge (hazard ratio, 5.7; 95% confidence interval, 1.6-20.6; P=.007). The double-orifice repair combined with ring annuloplasty provides very satisfactory long-term results in patients with degenerative mitral regurgitation in the setting of bileaflet and anterior leaflet prolapse.