A 47-year-old man with chronic kidney disease presents with palpitations and proximal muscle weakness. Serum potassium is 6.8 mmol/L, the sample is non-haemolysed, and the ECG shows peaked T waves but no QRS widening. He has already received intravenous calcium gluconate, and repeat ECG monitoring is in progress. Which additional treatment is most appropriate to shift potassium intracellularly?
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