NPPB and heart failure: Adults ≥40 years old, LVEF 45%, heart failure signs/symptoms, NT-proBNP >400 pg/ml, on diuretic therapy, SBP >140 mmHg or 160 mmHg if on ≥3 BP medications, eGFR ≥30 ml/min/1.73 m2 and K <5.2 mmol/L