424 Left ventricular function after correction of a proportionate mitral regurgitation: impact of the clipping approach

Abstract

Abstract Aims : Secondary mitral regurgitation (MR) is associated with poor outcome in systolic heart failure (HF-)patients. Percutaneous edge-to-edge mitral valve repair (PMVR) recently failed to prove any beneficial effect over optimal medical treatment (OMT). Nevertheless, little is known about the effect of PMVR on LV performance and mechanics in HF-patients with severe secondary MR. Method and results Thirty-seven patients with severe secondary MR treated by PMVR were included and compared (according to indices of LV myocardial function) to nineteen patients with treated by OMT. Both groups were clinically comparable. At 6-month follow-up, only LV constructive work improve significantly in both groups (977 vs 1101 mmHg.%, p =0,003, 967 vs 1110 mmHg.%, p = 0,002 for PMVR and OMT groups, respectively) whereas left ventricular (LV) end-systolic volume index, LV ejection fraction and global longitudinal strain were not different. Compared to MITRA-FR and COAPT studies, our population had a proportionate MR (blue point in Figure 1, panel A). Figure 1-panel B demonstrate that only five patients of PMVR group had disproportionate MR (red points). Interestingly, these patients hadn’t any major event during 6 months FU. Conclusion Echocardiographic characteristics at 6-month follow-up are not different when compare PMVR and OMT for HF- patients with a severe proportionate secondary MR. Main echocardiographic characteristics PMVR OMT Inclusion 6-month p Inclusion 6-month p NYHA 2.6 ± 0.6* 1.8 ± 0.7* <0.0001 2.3 ± 0.5* 2.2 ± 0.4* 0.43 LVESVi(ml.m-2) 76 ± 36 75 ± 35 0.6 94 ± 32 90 ± 31 0.35 LVEF (%) 33 ± 6 33 ± 13 0.78 30 ± 8 31 ± 8 0.53 GLS (%) -9.8 ± 4 -9.9 ± 3.9 0.84 -10.0 ± 4 -10.3 ± 3.3 0.62 MR grade 3.4 ± 0.5 1.3 ± 1.0* <0.0001 3.5 ± 0.5 2.8 ± 1.1* 0.007 Global work index (mmHg.%) 831 ± 370 933 ± 406 0.07 875 ± 314 939 ± 304 0.14 Constructive work (mmHg.%) 977 ± 366 1101 ± 404 0.003 967 ± 290 1110 ± 349 0.002 *symbols denote p < 0.05 between both groups Abstract 424 Figure.