What is the main function of an automated external defibrillator (AED)?

An automated external defibrillator (AED) primarily functions to analyze the heart's electrical rhythms and, when necessary, provide defibrillation to restore a normal heart rhythm in individuals experiencing sudden cardiac arrest. The device is designed to detect life-threatening arrhythmias, such as ventricular fibrillation or pulseless ventricular tachycardia, and provide an electrical shock to reset the heart's rhythm. This critical action can dramatically increase a patient's chances of survival if performed promptly.

The device is user-friendly, equipped with voice prompts and visual instructions that guide the rescuer through the process, making it accessible even to those who are not medical professionals. While AEDs can sometimes be used in conjunction with CPR, their main role is focused on the rhythm analysis and defibrillation aspect rather than delivering medications, performing CPR, or providing oxygen.