A 58-year-old man with CKD stage 4 (eGFR 22 mL/min/1.73m²) and type 2 diabetes presents to the emergency department with palpitations and muscle weakness. ECG shows peaked T waves and prolonged PR interval. Serum potassium is 7.2 mEq/L. He is haemodynamically stable with normal sinus rhythm. What is the most appropriate immediate next step in management?

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