Final answer:
An AED is a portable electronic device used in cardiac emergencies to correct abnormal heart rhythm. It automatically diagnoses the heart condition and applies the appropriate shock. CPR is often recommended before using an AED.
Step-by-step explanation:
An AED, or automated external defibrillator, is a portable electronic device used in cardiac emergencies to deliver a large charge to a person's heart to correct abnormal heart rhythm. AEDs are commonly found in ambulances and public places and are designed to be used by laypersons. The device automatically diagnoses the patient's heart condition and applies the appropriate shock. CPR (cardiopulmonary resuscitation) is often recommended before using a defibrillator. CPR helps circulate blood to vital organs until the AED can be used. In cases of ventricular fibrillation or other life-threatening cardiac arrhythmias, using an AED as soon as possible is crucial in saving the victim's life.