Inclusion Criteria:  Age >18 years Heart failure, clinical or echo confirmed (HFrEF); patients with AF will be included provided the EF can be determined NYHA class II to IV Serum potassium 5.0-5.5 mmol/L Adequate blood pressure (>90 mm Hg systolic and without postural hypotension; drop of Systolic Blood Pressure >20 or feeling dizzy with change in posture; exclude patients with symptomatic hypotension due to high doses of ACEi/ARB or MRA unless the clinical condition has improved) CKD with stable eGFR <60 ml/min/1.73m2 None or submaximal dose of ACEi/ARB and/or MRA or both  Exclusion Criteria:  • Pregnancy  Active malignancy or infection BMI>35 kg/m2 Poorly controlled sugar HBA1C> 70 mmol/mmol Recent ACS Potassium therapy Prolonged QT>550msec, congenital QT syndrome and history of prolong QT requiring drug discontinuation