This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ECG and Arrhythmias 1, Subject name: Medicine
Which of the following is used to prevent recurrence of this rhythm disorder? 
Select and explain. 
A. Catheter ablation, B. Adenosine, C. Synchronized Defibrillation with 120 Joules biphasic, D. Non synchronised DC Shock 200 Joules biphasic
A: Catheter ablation
Answer: A: Catheter ablation 
Explanation: ECG shows hea rate of 200/min with narrow complex tachycardia. There is global segment depression and hidden P waves which is a feature of Paroxysmal Supraventricular tachycardia. Choice A is the answer as Catheter ablation will be used to prevent recurrence of such episodes. For example, in AVN, the slow pathway is ablated, which prevents the reentry cycle Choice B is used for chemical cardioversion in case of PSVT Choice C is used for electrical cardioversion in case of PSVT Choice D is used for Ventricular fibrillation and pulseless VT.