A 65-year-old man with known stage 3 chronic kidney disease has a serum potassium of 6.5 mmol/L on routine bloods, confirmed on repeat. ECG shows tall peaked T waves. What is the most appropriate immediate treatment?AOral Calcium resonium onlyBIntravenous Calcium Gluconate and nebulised Salbutamol, followed by intravenous insulin with glucoseCStop his ACE inhibitor and repeat potassium in 1 weekDArrange outpatient renal clinic reviewEGive intravenous Sodium bicarbonate aloneCheck my answer