A Three-Arm, Observational, Pilot Study of 68Ga-Fibroblast Activation Protein Inhibitor (FAPI) Positron Emission Tomography in Heart Failure

HFpEF Group Inclusion: * Patients aged ≥ 30 years old with exertional dyspnea (NYHA II and III) and LVEF ≥50% * BMI ≥ 30 * New diagnosis of HFpEF based on RHC at baseline (elevated PCWP at rest and/or during exercise) HFpEF Group Exclusion: * Primary cardiomyopathy or pericardial disease or ≥ moderate valvular disease * Dyspnea due to lung disease or CAD * Severe anemia, liver, or renal disease * Active cancer * Systemic active inflammatory or autoimmune disease (e.g. rheumatoid arthritis, SLE, etc.) * Recent hospitalization (\< 30 days) or coronary revascularization (\< 90 days) * Patients…