Final answer:
Ventricular fibrillation is a critical condition where the heart beats irregularly and cannot pump blood, treated with defibrillation, often using External Automated Defibrillators in public spaces.
Step-by-step explanation:
Ventricular fibrillation (Vfib) is a severe medical emergency characterized by the heart beating in an erratic, uncontrolled manner, rendering it incapable of pumping blood effectively. In such a state, the ventricles of the heart do not pump blood, which can lead to brain death within minutes if left untreated. Defibrillation is the most common treatment for Vfib, using special paddles to deliver an electrical charge to the heart in an attempt to reset and establish a normal sinus rhythm. External Automated Defibrillators (EADs) are now common in public spaces and provide verbal instructions to enable even those without medical training to attempt lifesaving defibrillation.