This study will include volunteers diagnosed with a form of heart failure that is characterized by a weakened heart muscle that appears to be pumping in a normal manner. This condition is called "heart failure with preserved ejection fraction" or HFpEF. For these individuals, it has been determined that the health problems and symptoms experienced may be due to a significant increase in the pressure of one of the chambers of the heart. This pressure build-up causes a variety of symptoms, including tiredness, difficulty breathing, and reduced ability to exercise/walk.

This study is to help evaluate a new device (the "Satera Ablation System") designed to reduce the build-up of pressure described above. The Satera Ablation system is a catheter used to ablate or destroy the splanchnic nerve on one side of the body. The Sponsor believes by destroying this nerve there may be some reduction in the symptoms caused by HFpEF. The procedure using the Satera Ablation System will be performed in the catheterization lab and does not involve surgery. Participants will stay overnight in the hospital following the procedure for observation.

The length of subject participation in the study will be approximately 24 months and includes 5 office visits, 1 phone call and 2 procedures. Participants in this research study will be randomized to either the treatment group or the control group and have a 2:1 chance of receiving the research treatment with the Satera Ablation System at the time of randomization.

This study will help us learn more about how safe and effective the Satera Ablation System is in treating the symptoms of patients with HFpEF.