Acute heart failure (HF) admissions are common. They are often associated with prolonged hospitalisations and poor outcomes. One-third of chronic HF patients also suffer from chronic kidney disease (CKD). Hence, acute admissions of HF with CKD are common and are associated with longer length of stay and increased mortality. Hyperkalaemia and acute on chronic renal impairment are important challenges in the management of these cases. Cautious introduction of high-dose diuretic therapy, followed by the re-commencement of renin-angiotensin-aldosterone (RAAS) inhibitors, improves length of stay, quality of life, and prognosis. During an admission on to the medical assessment unit careful monitoring and management of the patient’s clinical condition and biochemistry is essential.