This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiopulmonary Cerebral Resuscitation, Subject name: Anaesthesia
Defibrillation with what energy level is appropriate for ventricular fibrillations: 
Select and explain. 
A. 120J, B. 250J, C. 300J, D. 400J
B: 250J
Answer: B: 250J 
Explanation: The management of ventricular fibrillation and pulseless ventricular tachycardia is the same. Immediate chest compression is to be staed. It is ofutmost necessity to defibrillate at the earliestbecause of the chances of survival decreases by 7-10% every minute without defibrillation. Cardiac arrest - 200 J AC shock only given in ventricular fib & pulseless VT Defibrillation involves delivering an electrical current between two pads placed on the chest so to interrupt disorganized cardiac activity and restore an organized cardiac rhythm or asystole for at least 5 seconds. The energy that must be applied is Monophasic defibrillator- 360 J Biphasic defibrillator- 120 J