How does an automated external defibrillator (AED) function?

An automated external defibrillator (AED) functions primarily by delivering an electrical shock to the heart in cases of life-threatening arrhythmias, such as ventricular fibrillation or pulseless ventricular tachycardia. The shock aims to restore the heart's normal rhythm, allowing it to resume its natural pumping action. This intervention is critical during cardiac arrest, where rapid response and defibrillation can significantly increase the chances of survival and further neurological recovery.

The functioning of the AED is based on its ability to analyze the heart's rhythm through electrode pads placed on the patient's chest. If a shockable rhythm is detected, the AED prompts the user to deliver the shock, which can halt chaotic electrical activity in the heart, potentially allowing it to reset and return to a normal rhythm.

Other methods mentioned, such as pumping blood, cooling the heart, or starting chest compressions, do not accurately describe how the AED operates. Pumping blood is related to the mechanical action of the heart or manual cardiopulmonary resuscitation (CPR). Cooling the heart may be a therapeutic measure in certain medical emergencies, and initiating chest compressions is part of CPR and not the action of an AED. Thus, the AED's unique role in delivering a corrective electrical