A 70-year-old man with CKD stage 4 presents to the emergency department with weakness. ECG shows peaked T waves. Laboratories: potassium 6.8 mmol/L, creatinine 380 µmol/L, bicarbonate 18 mmol/L. What is the most appropriate immediate management?AAdminister IV calcium gluconate, IV insulin with dextrose and initiate measures to lower potassiumBStart oral sodium polystyrene sulfonate aloneCObserve and repeat potassium in 6 hoursDStart an ACE inhibitor to improve long-term outcomesEGive a large bolus of normal saline and no other therapyCheck my answer