This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Arrhythmias, Subject name: Medicine
Asynchronous cadioversion is given in : 
Select and explain. 
A. AF, B. Ventricular fibrillation, C. Atrial flutter, D. Ventricular tachycarida
B: Ventricular fibrillation
Answer: B: Ventricular fibrillation 
Explanation: Ans. is 'b' Ventricular fibrillation Electrical cardioversion and defibrillation are the most reliable methods for termination of arrhythmias. These methods depolarize all or at least a large portion of excitable myocardium in a near homogenous fashion, the electrical shock can interrupt reentrant arrhythmias.Energy is delivered synchronously with the QRS complex for all arrhythmias except ventricular flutter and ventricular fibrillation.