<prompt> An 8-month-old female child presented to emergency with a hea rate of 220minute and features of congestive hea failure. Her hea rate comes down to normal after administering intravenous adenosine. What is the most likely diagnosis?Atrial fibrillationAtrial flutterParoxysmal supraventricular tachycardiaVentricular tachycardia  <response>: Ans. is c i.e., Paroxysmal supraventricular tachycardia o Adenosine is the DOS for PSVT. 