A 72-year-old man with chronic kidney disease stage 4 (eGFR 22 mL/min/1.73 m²) presents with hyperkalaemia (serum potassium 6.7 mmol/L), tall peaked T waves on ECG and mild weakness. What is the most appropriate immediate treatment?AAdminister intravenous calcium gluconate and urgent measures to shift and remove potassiumBGive oral sodium polystyrene sulfonate onlyCObserve and repeat blood tests in 6 hoursDStop ACE inhibitor onlyEStart spironolactoneCheck my answer