Fast Induced Remodeling in Heart Failure With Preserved Ejection Fraction

After enrollment, baseline data will be collected, and subjects will then have a pacemaker implanted. After 6 weeks, subjects will have a follow up visit with a blood draw and a cardiac MRI. At this visit, subjects will be randomized 2:1 for pacing therapy or as a control (programmed into either a non-pacing mode or an exertional rate-adaptive pacing mode with no planned pacing at rest). After 3, 6 and 9 months after randomization, subjects will return for a follow up visit. At the 9-month visit therapy modifications will be made based on initial pacing randomization assignment: pacing therapy will be terminated in the original therapy group and enabled in the control group. After an additional 3-months of follow-up, subjects will return for their final visit, therapies will be disabled in all subjects and subjects will be exited. Echocardiographic, functional, and health status endpoints will be collected and analyzed to assess therapy efficacy.