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EasyCardiologyParoxysmal supraventricular tachycardiaus-abemus-abfmus-usmle-step-2

A 28-year-old man presents with palpitations and anxiety. ECG shows narrow-complex tachycardia at 190 per minute with regular rhythm consistent with paroxysmal supraventricular tachycardia. He is hemodynamically stable. Vagal maneuvers fail to terminate the rhythm. What is the most appropriate next step?

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