Final answer:
The automated external defibrillator (AED) is used in children over 1 year of age to terminate arrhythmias like ventricular fibrillation, and it provides instructions for use. CPR is usually recommended before applying the AED.
Step-by-step explanation:
An automated external defibrillator (AED) is a device that delivers a large charge in a short burst to a person's heart during a cardiac emergency, such as a heart attack caused by ventricular fibrillation or cardiac arrhythmia. AEDs are crucial in terminating the arrhythmia and allowing the heart's natural pacemaker to resume a normal rhythm. This device is particularly designed for use by laypersons and offers verbal instructions for correct application. It uses an electrocardiogram to diagnose the patient's heart condition before applying an appropriate level of energy in the shock. In the case of children over 1 year of age, the AED can be indicated if they present with conditions that could lead to cardiac arrhythmias. Before using the AED, CPR (cardiopulmonary resuscitation) is often recommended.