| Completed | N/A | 185 | Europe | Comprehensive Cardiovascular magnetic resonance (CMR), Blood sampling, TTE (EchoErgo), Invasive pressure-volume (PV) Loops, Left ventricular (LV) biopsy | Goethe University, Deutsches Zentrum für Herz-Kreislauf-Forschung (DZHK) | Heart Failure With Normal Ejection Fraction | 12/22 | 12/22 | | |