Rationale and Design of a Randomized Clinical Trial to Assess the Safety and Efficacy of Multipoint Pacing Therapy: MOre REsponse on Cardiac Resynchronization Therapy with MultiPoint Pacing (MORE-CRT MPP–PHASE II)

Background Although cardiac resynchronization therapy (CRT) is beneficial in most heart failure patients, up to 40% do not respond to CRT. Data from the MultiPoint Pacing (MPP) IDE trial and MORE-CRT MPP-PHASE I study suggest improved response in subjects in the MPP arm-programmed with wide left ventricular (LV) electrode anatomical separation (>= 30 mm) and shortest timing delays of 5 milliseconds (MPP-AS)-compared with quadripolar biventricular (BiV) pacing. Study design The MORE-CRT MPP-PHASE II trial is a prospective, randomized, multicenter study to assess the 6-month impact of MPP programmed to mandated MPP-AS settings in subjects who do not respond to 6 months of BiV pacing (MPP OFF). Approximately 5,000 subjects with a standard CRT indication will be enrolled and implanted with a quadripolar CRT system (Abbott) capable of delivering MPP. Only BiV pacing is activated at implant. At 6 months, subjects classified as CRT nonresponders (<15% reduction in LV end-systolic volume) are randomized (1:1) to MPP or continued BiV pacing. The mandated MPP parameters (eg, MPP-AS) are programmed to subjects randomized to the MPP arm. At 12 months, the 2 groups will be compared to determine if there is a difference in CRT response rate. Conclusions This trial will evaluate whether MPP programmed to mandated MPP-AS settings improves LV reverse remodeling and clinical response to CRT in patients who fail to respond to 6 months of BiV pacing.