A 28-year-old man complains of heart racing

A 28-year-old man complains of heart racing. He is completely conscious throughout. He has a pulse of 132 beats/minute, a blood pressure of 120/70 mmHg and a respiratory rate of 21 breaths/minute. An ECG was taken which shows supraventricular tachycardia. What is the SINGLE most appropriate immediate management?

A.Amiodarone
B.Adenosine
C.Lidocaine
D.Verapamil
E.Metoprolol

Ans: B.Adenosine