Ventricular tachycardia Quiz: Ace Your Exams

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A 40-year-old man is brought to the emergency department in cardiac arrest. He has no known medical history. CPR is in progress, and the cardiac monitor demonstrates polymorphic ventricular tachycardia. Defibrillation is successful, and there is return of spontaneous circulation. Temperature is 37 °C (98.6 °F), pulse is 70/min, blood pressure is 100/72 mmHg, respiratory rate is 16/min, and oxygen saturation is 100% on the ventilator. His examination and laboratory studies are unremarkable, including cardiac enzymes. Echocardiography shows no significant structural heart disease. An ECG shows ST changes in V1-3 without reciprocal changes. A portion of his ECG is shown below. Which of the following is the next best step in management?
 
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