A 58-year-old man with a history of myocardial infarction 6 months ago presents to the emergency department with palpitations and syncope. ECG shows a prolonged QT interval (520 ms) and polymorphic ventricular tachycardia. Serum electrolytes reveal K⁺ 3.2 mmol/L and Mg²⁺ 1.6 mg/dL. He is on amiodarone for arrhythmia prophylaxis. What is the most appropriate immediate next step in management?

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