A 58-year-old male with type 2 diabetes and chronic kidney disease (eGFR 22 mL/min) presents to the emergency department with acute dyspnea and palpitations. His serum potassium is 7.2 mEq/L. The ECG shows the pattern marked **A** in the diagram — tall, peaked, narrow-based T waves in the precordial leads, with flattened P waves and prolonged PR interval. Which of the following interventions should be administered FIRST to address the immediate life-threatening cardiac effects of this electrolyte abnormality?
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