JOURNAL ARTICLE
OBSERVATIONAL STUDY
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Immediate and 12-Month Outcomes of Ischemic Versus Nonischemic Functional Mitral Regurgitation in Patients Treated With MitraClip (from the 2011 to 2012 Pilot Sentinel Registry of Percutaneous Edge-To-Edge Mitral Valve Repair of the European Society of Cardiology).

In literature, there are limited data comparing ischemic mitral regurgitation (I-MR) versus nonischemic MR regarding outcomes after percutaneous "edge-to-edge" repair. We aimed to describe the early and 12-month results after MitraClip device implantation regarding the 2 etiologies. From January 2011 to December 2012, the Transcatheter Valve Treatment Sentinel Pilot Registry included 452 patients with MR who underwent MitraClip procedure in 25 centers across Europe. The prevalent etiology was I-MR (235 patients, 52.0%). I-MR group had a significantly higher proportion of men (74.9 vs 59.9%, p <0.001) and surgical risk (logistic EuroSCORE 24.8 ± 18.2 vs 18.8 ± 16.3, p <0.001). Acute procedural success was high (96%) and similar between groups (p = 0.48). Patients with I-MR required a higher, albeit not significant, number of clips to reduce MR (p = 0.08). Inhospital mortality was low (2.0%) without significant differences between etiologies. The estimated 1-year mortality and rehospitalization rates were 15.0% and 25.8%, respectively, without significant differences between groups. Paired echocardiographic data showed a persistent improvement of MR at 1 year in both etiologies. Despite a significant overall reverse atrial remodeling after clip, there were no significant changes in left ventricular volumes. In conclusion, this large independent cohort showed that percutaneous "edge-to-edge" therapy was associated with early- and long-term improvement of MR severity and functional condition both in patients with I-MR and nonischemic MR. There were no significant differences between the 2 etiologies regarding survival and freedom from rehospitalization due to heart failure at the 1-year follow-up.

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