NPPB and hydrops fetalis: Stage C HF in NYHA functional class III.At least 1 hospitalization for worsening HF within the past year or elevated levels of BNP > 300 pg/mL or NT-proBNP > 1500 pg/mL.Reduced and preserved EF.Optimal medical therapy, including GDMT.Clinically stable for a minimum of 3 months prior to enrolment.