Acute outcomes of MitraClip therapy for mitral regurgitation in high-surgical-risk patients: emphasis on adverse valve morphology and severe left ventricular dysfunction

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Abstract
We sought to assess the feasibility of catheter-based mitral valve repair using the MitraClip system in high-surgical-risk patients with mitral regurgitation (MR) ≥grade 3+. MitraClip therapy was performed in 51 consecutive patients [73 ± 10 years; 34 (67%) men] with symptomatic functional [n = 35 (69%)] or organic MR [n = 16 (31%)]. Mean logistic EuroSCORE was 29 ± 22%; Society of Thoracic Surgeons score was 15 ± 11. Left ventricular (LV) ejection fraction was 36 ± 17%. In 35 patients (69%), adverse mitral valve morphology and/or severe LV dysfunction were present. MitraClip implantation was successful in 49 patients (96%). Most patients [n = 34/49 (69%)] were treated with a single clip, whereas 14 patients (29%) received two clips and one patient received three clips. Mean device and fluoroscopy times were 105 ± 65 min and 44 ± 28 min, respectively. Procedure-related reduction in MR severity was one grade in 16 patients (31%), two grades in 24 patients (47%), and three grades in 9 patients (18%). Forty-four of the 49 successfully treated patients (90%) showed clinical improvement at discharge [NYHA functional class ≥III in 48 patients (98%) before and 16 patients (33%) after the procedure (P < 0.0001)]. There were no procedure-related major adverse events and no in-hospital mortality. Mitral valve repair using the MitraClip system was shown to be feasible in patients at high surgical risk primarily determined by an adverse mitral valve morphology and/or severe LV dysfunction.

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