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Defibrillation is critical for treating pulseless ventricular tachycardia because it involves delivering an electrical shock to the heart to restore a normal rhythm. When a patient experiences pulseless ventricular tachycardia, the heart is in a state of rapid, ineffective electrical activity, which can lead to cardiac arrest if not addressed immediately.

Defibrillation works by depolarizing a critical mass of the heart muscle, allowing the heart’s natural pacemaker to regain control and reestablish a normal heartbeat. This action is part of the emergency response for a patient in cardiac arrest, making it an essential component of the advanced life support protocols.

In the context of the adult out-of-hospital chain of survival, this step is crucial and must be performed as soon as possible to increase the victim's chances of survival and recovery, demonstrating the importance of timely defibrillation in emergency situations. Other aspects of care, such as post-cardiac arrest care or prevention, while important in the broader scope of emergency response, do not directly address the immediate need for rhythm control in the case of pulseless ventricular tachycardia.