Managing Congestion in Heart Failure: A Mechanistic Study in Patients With HFpEF

All patients will undergo baseline tests, including echocardiography (left ventricular ejection fraction, E/e', left atrial volume index, left atrial strain analysis, left ventricular mass index, tricuspid annular plane systolic excursion, right ventricular strain, inferior vena cava index) and blood tests (NT-proBNP, creatinine, GFR, sST2, CA 125, bio-ADM, ALAT, ASAT, complete blood count, and hsCRP). Evaluation of extracellular and total body water volumes in the arms, legs, and trunk will be conducted using the Body Water Scale InBody (South Korea) and daily monitoring of pulmonary pressure through CardioMEMSTM. Bioelectrical impedance analysis (BIA) will be used to assess volume. Additional blood tests will be conducted at weeks 2, 6, 12, and at the final visit, with a focus on NT-proBNP, creatinine, GFR, ALAT, ASAT, hemoglobin, hematocrit, hsCRP, sST2, CA 125, and bio-ADM. At the final visit, a complete set of tests will be repeated to assess overall health and response to the int