A 58-year-old man with a history of hypertension and left ventricular hypertrophy presents to the emergency department with palpitations and dyspnea. His ECG shows a regular narrow-complex tachycardia at 180 bpm with a visible P wave buried in the T wave of the preceding beat. Blood pressure is 140/90 mmHg, and he is conscious and alert. Carotid massage produces no effect. What is the most appropriate next step in management?

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