A 69-year-old man with stage 4 chronic kidney disease (eGFR 18 mL/min/1.73 m²) is admitted with a serum potassium of 6.8 mmol/L and tall peaked T waves on ECG. He is haemodynamically stable. What is the most appropriate immediate treatment?AOral Sodium polystyrene sulfonateBIntravenous Calcium gluconate followed by insulin and dextroseCIncrease dietary potassium intakeDStart oral Sodium bicarbonate aloneENo specific treatment is neededCheck my answer