Defibrillators are devices that restore a normal heartbeat by sending an electrical pulse or shock to the heart. They are used to prevent or correct an arrhythmia, a heartbeat that is irregular or that is too slow or too fast. Defibrillators can also restore the heart's heartbeat if the heart stops suddenly.

Different types of defibrillators work in different ways. Automated external defibrillators (AEDs), which are used in many public areas, are designed to save the lives of people in sudden cardiac arrest. Even untrained bystanders can use these devices in an emergency.

Other defibrillators can prevent sudden death in people who are at high risk for a life-threatening arrhythmia. They include implantable cardioverter defibrillators (ICDs), which are surgically placed in your body, and portable cardioverter defibrillators (WCDs), which rest on the body. It can take time and effort to get used to living with a defibrillator, and it is important to be aware of potential risks and complications.