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BACKGROUND: Biventricular endocardial pacing (BiV ENDO) is a therapy for heart failure patients who cannot receive transvenous epicardial cardiac resynchronization therapy (CRT) or have not responded adequately to CRT. BiV ENDO CRT can be delivered by a new wireless LV ENDO pacing system (WiSE-CRT system; EBR Systems, Sunnyvale, CA), without the requirement for lifelong anticoagulation. OBJECTIVE: The purpose of this study was to assess the safety and efficacy of the WiSE-CRT system during real-world clinical use in an international registry. METHODS: Data were prospectively collected from 14 centers implanting the WiSE-CRT system as part of the WiCS-LV Post Market Surveillance Registry. ( Identifier: NCT02610673). RESULTS: Ninety patients from 14 European centers underwent implantation with the WiSE-CRT system. Patients were predominantly male, age 68.2 ± 10.5 years, left ventricular ejection fraction 30.6% ± 8.9%, mean QRS duration 180.7 ± 27.0 ms, and 40% with ischemic etiology. Successful implantation and delivery of BiV ENDO pacing was achieved in 94.4% of patients. Acute (<24 hours), 1- to 30-day, and 1- to 6-month complications rates were 4.4%, 18.8%, and 6.7%, respectively. Five deaths (5.6%) occurred within 6 months (3 procedure related). Seventy percent of patients had improvement in heart failure symptoms. CONCLUSION: BiV ENDO pacing with the WiSE-CRT system seems to be technically feasible, with a high success rate. Three procedural deaths occurred during the study. Procedural complications mandate adequate operator training and implantation at centers with immediately available cardiothoracic and vascular surgical support.

Original publication




Journal article


Heart Rhythm

Publication Date





1291 - 1297


Cardiac resynchronization therapy, Endocardial pacing, Heart failure, Leadless pacing, Nonresponder, Aged, Cardiac Resynchronization Therapy, Cardiac Resynchronization Therapy Devices, Endocardium, Equipment Design, Female, Heart Failure, Heart Ventricles, Humans, Male, Prospective Studies, Registries, Stroke Volume, Treatment Outcome, Ventricular Function, Left