Which rhythm is regarded as a shockable rhythm during defibrillation?

Ventricular Fibrillation is recognized as a shockable rhythm during defibrillation due to its chaotic electrical activity within the heart. This disorganized rhythm prevents the heart from effectively pumping blood, leading to a lack of adequate circulation and oxygen delivery to vital organs. Defibrillation aims to deliver an electrical shock that interrupts this dysrhythmia and allows the heart's natural pacemaker to restore a normal rhythm.

In contrast, asystole represents a flatline state with no electrical activity and is not suitable for defibrillation, as there is nothing for the shock to reset. Similarly, Pulseless Electrical Activity may show electrical activity on the monitor, but it does not result in effective heart contractions and, thus, also does not respond to defibrillation. Bradycardia, which involves a slow heart rate, is generally not an indication for defibrillation unless it progresses to a more critical state that is not addressed through other means.