Which rhythm is life-threatening and requires immediate defibrillation?

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Multiple Choice

Which rhythm is life-threatening and requires immediate defibrillation?

Ventricular fibrillation is life-threatening because the ventricles beat in a rapid, chaotic, uncoordinated way with no effective contraction, so there is no meaningful cardiac output. Without perfusion, brain and organ failure occur within minutes. The only rapid way to restore a pulse and circulation is to deliver a defibrillation shock, which interrupts the chaotic electrical activity and allows the heart to resume a normal rhythm. Time matters: every moment without defibrillation dramatically lowers the chance of return of spontaneous circulation. Other rhythms described do not require immediate defibrillation. Pulseless electrical activity shows electrical activity without a palpable pulse and is treated with CPR and addressing underlying causes, not immediate shocks. A junctional rhythm or sinus bradycardia is generally not shockable and is managed with rate control or pacing and other supportive measures.

Ventricular fibrillation is life-threatening because the ventricles beat in a rapid, chaotic, uncoordinated way with no effective contraction, so there is no meaningful cardiac output. Without perfusion, brain and organ failure occur within minutes. The only rapid way to restore a pulse and circulation is to deliver a defibrillation shock, which interrupts the chaotic electrical activity and allows the heart to resume a normal rhythm.

Time matters: every moment without defibrillation dramatically lowers the chance of return of spontaneous circulation. Other rhythms described do not require immediate defibrillation. Pulseless electrical activity shows electrical activity without a palpable pulse and is treated with CPR and addressing underlying causes, not immediate shocks. A junctional rhythm or sinus bradycardia is generally not shockable and is managed with rate control or pacing and other supportive measures.

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