**Question:** Treatment of choice in ventricular fibrillation is

A. Amiodarone
B. Magnesium sulfate
C. Defibrillation
D. Epinephrine

**Core Concept:**
Ventricular fibrillation is a life-threatening cardiac arrhythmia characterized by rapid, chaotic contractions of the ventricles, leading to a loss of cardiac output and circulatory collapse. The primary goal of treatment is to restore normal sinus rhythm with adequate blood flow to vital organs.

**Why the Correct Answer is Right:**
C. Defibrillation is the correct answer because it involves delivering a high-energy electrical shock to the heart, thereby interrupting the abnormal electrical activity and restoring normal heart rhythm. This intervention has a high success rate in terminating ventricular fibrillation, ensuring adequate cardiac output, and preventing cardiac arrest-related morbidity and mortality.

**Why Each Wrong Option is Incorrect:**
A. Amiodarone is an antiarrhythmic agent primarily used for the treatment of certain types of supraventricular tachyarrhythmias, such as atrial fibrillation and atrial flutter. It is less effective in ventricular arrhythmias.
B. Magnesium sulfate is primarily used to treat eclampsia and status epilepticus, not ventricular fibrillation. It does not directly restore normal heart rhythm.
D. Epinephrine (adrenaline) is a vasopressor used to increase blood pressure but does not directly terminate ventricular fibrillation.

**Clinical Pearl:**
In clinical scenarios, defibrillation should be performed promptly upon recognition of ventricular fibrillation, as survival rates increase as early defibrillation occurs. Additionally, administering appropriate pharmacological therapy (e.g., amiodarone) alongside defibrillation can further enhance its effectiveness.