A 68-year-old man with chronic kidney disease presents with weakness after spironolactone was added to his medicines. His serum potassium is 7.0 mmol/L (3.5–5.2), and the ECG shows broad QRS complexes with intermittent sine-wave morphology. He is conscious, with a blood pressure of 96/58 mmHg. Which one of the following is the most appropriate immediate treatment?
Keep going — a set of ten like this one, one at a time.
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