A 58-year-old man with chronic kidney disease presents with weakness. Serum potassium is 7.1 mmol/L, and the laboratory result has been confirmed on a repeat non-haemolysed sample. His electrocardiogram shows tall peaked T waves, PR prolongation and broad QRS complexes. Blood pressure is 132/78 mmHg, and he has a patent intravenous line. Which treatment should be given immediately?
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