Systematic Fluoroscopic-Echocardiographic Fusion Imaging Protocol for Transcatheter Edge-to-Edge Mitral Valve Repair Intraprocedural Monitoring

Background: Whether fluoroscopic-echocardiographic fusion imaging (FI) might offer added value for intraprocedural guidance during transcatheter edge-to-edge mitral valve repair is yet unknown, and few data exist regarding the safety and feasibility of this novel technology. Methods: The aim of this single-center study was to test and validate a FI protocol for intraprocedural monitoring of transcatheter edge-to-edge mitral valve repair and assess its clinical usefulness. Eighty patients underwent MitraClip implantation using FI guidance (FI+) for either degenerative (35%) or functional (65%) mitral regurgitation and were compared with the last 80 patients before FI introduction, treated using conventional echocardiography and fluoroscopic monitoring (FI−). Results: The number of patients treated for functional and degenerative mitral regurgitation was similar between the FI+ and FI− groups, as well as the number of devices implanted (1.51 ± 0.5 vs 1.58 ± 0.6, P =.46). The prevalence of complex mitral anatomy for percutaneous repair was high (32.5%, up to 39.2% in the hybrid arm). Fluoroscopy time was significantly lower in FI+ patients (37.3 ± 14.6 vs 48.3 ± 28.3 min, P =.003), but not kerma area product (91.5 ± 74.1 vs 108.8 ± 105.0 Gy · cm2, P =.23) or procedural time (92.2 ± 36.1 vs 103.1 ± 42.7 min, P =.086). After adjusting for confounding factors (MitraClip XT device and complex anatomy), FI reduced fluoroscopy time (coefficient = −10.4 min; 95% CI, −18.03 to −2.82; P =.007) and improved procedural success at the end of the procedure (odds ratio, 2.87; 95% CI, 1.00 to 8.24; P =.049) and discharge (odds ratio, 2.24; 95% CI, 1.04 to 4.80; P =.039). Rates of periprocedural complications were similar in both groups (8.9% vs 13.0%, P =.40). Conclusions: The authors describe the systematic use of an FI protocol for intraprocedural guidance during transcatheter edge-to-edge mitral valve repair, demonstrating a reduction in fluoroscopy time and an improvement in procedural success in a population with a high prevalence of challenging mitral anatomy for percutaneous repair.