Mitral Valve Repair for Functional Mitral Regurgitation in End-Stage Dilated Cardiomyopathy

Abstract

Background— The aim of this study was to assess the results of mitral valve (MV) repair in functional mitral regurgitation because of end-stage dilated cardiomyopathy (DCM). Methods and Results— Seventy-seven patients with end-stage idiopathic (26 patients) or ischemic (51 patients) DCM underwent MV repair for functional mitral regurgitation (3 to 4+/4+). Fifty-eight patients (75.3%) were in New York Heart Association class III, and 19 (24.6%) were in IV. In 23 patients (29.8%) with a coaptation depth <1 cm, an isolated undersized annuloplasty was used. In the remaining 54 (70.1%), with a coaptation depth ≥1 cm, the “edge-to-edge” technique was associated with the annuloplasty. In most of the cases (88.3%), a complete rigid/semirigid ring was used. Concomitant coronary artery bypass graft was performed in 39 patients (50.6%). Hospital mortality was 3.8% (3 of 77). Actuarial survival was 90.7±3.64%, and freedom from cardiac events was 81.8±7.96% at 2.7 years. At a mean follow-up of 18.4±9.8 months (range, 1 month to 5 years) New York Heart Association class improved from 3.4±0.4 to 1.4±0.6 ( P <0.0001). Mitral repair failure (recurrence of MR ≥3+/4+) was documented in 7 patients (9%): 2 in the edge-to-edge (2 of 54, 3.7%) and 5 in the isolated annuloplasty group (5 of 23, 21.7%) ( P =0.03). Freedom from repair failure at 1.5 years was 95.0±3.4% and 77±12.1%, respectively ( P =0.04). The absence of the edge-to-edge was the only predictor of repair failure ( P =0.03). When residual MR was absent or mild, a reverse left ventricular remodeling was clearly documented. Conclusions— In patients with end-stage DCM, MV repair is feasible with low hospital mortality and important symptomatic improvement. The association of the edge-to-edge technique to the undersized annuloplasty can significantly improve the durability of the repair.