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Unstable wide complex tachycardia is a life-threatening arrhythmia that requires prompt intervention. Immediate defibrillation is the correct treatment in such cases because the patient is typically experiencing severe symptoms that may lead to deteriorating hemodynamics, potentially causing cardiac arrest. Defibrillation aims to reset the heart's electrical activity, interrupting the abnormal rhythm and allowing the normal conduction system to regain control.

In unstable cases, time is of the essence, and non-invasive treatments or medications are not sufficient to stabilize the patient due to the immediacy of the situation. Therefore, defibrillation is prioritized to quickly restore a normal rhythm and maintain adequate blood flow.