Health Outcomes Prospective Evaluation for Heart Failure With Ejection Fraction (EF) ≥ 40%

The initial trial design randomized subjects in a 2:1 ratio to receive a Rheos system plus medical management (Device Arm) or to receive medical management alone (Medical Management Arm). On March 24, 2011, the study closed to enrollment before adequate endpoint data was collected and before enrollment was completed; 19 subjects had been randomized, 10 device and 9 medical management. Medical management subjects were withdrawn from the study and subjects who had been implanted with the device were given the opportunity to continue in the study under long-term follow-up; 8 of the 10 device subjects continued in the study. Long-term follow-up visits occurred at 15 and 18 months post-randomization; visits occur semi-annually until study closure.

The study was not stopped for safety or futility, but for business/strategic reasons due to production of a new generation of the device.