Aims: To explore the characteristics and outcomes of patients undergoing transcatheter edge-to-edge repair (TEER) for primary mitral regurgitation (MR) according to the presence of left ventricular ejection fraction (LVEF) reduction post-procedure.
Methods and results: We retrospectively analyzed 317 individuals (median age 83 (IQR, 75-88) years, 197 (62.1%) males) treated with an isolated, first-time TEER that was concluded by a successful clip deployment. Stratified by LVEF change at 1-month compared to baseline, the cohort was evaluated for residual MR and heart failure (HF) indices up to 1-year, as well as all-cause mortality and HF hospitalizations at 2-years. Overall, 212 (66.9%) patients displayed LVEF reduction, which was mainly driven by lowered total stroke volume and diffuse hypocontractility. While postprocedural MR, transmitral mean pressure gradient, and functional status were comparable in the 2 study groups, patients with LVEF reduction exhibited a greater decline in filling pressures intra-procedurally; left ventricular mass index, pulmonary arterial systolic pressure, and serum natriuretic peptide level at 1-month; and walking limitation at 1-year. Also, by 2 years, they were less likely to die (13.3% vs 5.7%, p = 0.019), be readmitted for HF (17.1% vs 9.0%, p = 0.033), and experience either of the two (23.8% vs 12.7%, p = 0.012). Lastly, LVEF reduction was the only 1-month echocardiographic parameter to independently confer an attenuated risk for the composite of deaths or HF hospitalizations (HR 0.28, 95% CI 0.10-0.78, p = 0.016).
Conclusion: LVEF reduction at 1-month post-TEER for primary MR is associated with better clinical outcomes, possibly reflecting a more pronounced unloading effect of the procedure.
Keywords: Left ventricular ejection fraction; MitraClip; Mitral regurgitation; Mitral transcatheter edge-to-edge repair; Transcatheter mitral valve repair.
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