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4th May 2025

A 40-year-old man is admitted with palpitations but is otherwise well.

A 40-year-old man is admitted with palpitations but is otherwise well. His ECG shows a regular narrow complex tachycardia with a rate of 140 bpm. There is no evidence of a bundle branch block or delta waves. The blood pressure is 135/70mmHg and there are no adverse features. Vagal manoeuvres are not successful in cardioverting him. Which medication would be next in treating him?

Select the SINGLE most appropriate option from the list below. Select ONE option only.

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