This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Medicine
True about DC shock treatment in AF: 
Select and explain. 
A. Synchronized 50 Joules, B. Synchronized 250 Joules, C. Unsynchronized 50 Joules, D. Unsynchronized 250 Joules
A: Synchronized 50 Joules
Answer: A: Synchronized 50 Joules 
Explanation: Ans. A. Synchronized 50 Joulesa. In Atrial fibrillationb. Initial Monophasic = Synchronize DC shock of 50-100Joulesc. Initial Biphasic = 150J synchronized (upto 200) synchronized.