A 72 year old man with known chronic kidney disease stage 3 presents with serum potassium 6.5 mmol/L, ECG showing peaked T waves. He is otherwise haemodynamically stable. What is the most appropriate immediate treatment?AAdminister intravenous calcium gluconate to stabilise the myocardiumBStart oral sodium polystyrene sulfonate onlyCStop his ACE inhibitor and recheck potassium in a weekDObserve without intervention because he is stableEGive loop diuretic onlyCheck my answer