An 8–month–old female child presented to emergency with a heart rate of 220/minute and features of congestive heart failure. Her heart rate comes down to normal after administering intravenous adenosine. What is the most likely diagnosis ?: (A) Atrial fibrillation, (B) Atrial flutter, (C) Paroxysmal supraventricular tachycardia, (D) Ventricular tachycardia
Answer is C. Adenosine is the DOS for PSVT.