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Ventricular fibrillation is chaotic electrical activity in the heart. It is a lethal dysrhythmia that does not produce a pulse. V-fib is the most common initial dysrhythmia in cardiac arrest, and will regress to asystole if it is not treated right away. The treatement for V-Fib is rapid defibrillation. Every minute that defibrillation is delayed, the chance of survival is reduced by 10%.