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A defibrillator is a medical device used to deliver an electric shock to the heart in order to restore its normal rhythm. This is done by passing an electric current through the heart muscle, which can help to stop abnormal heart rhythms such as ventricular fibrillation or pulseless ventricular tachycardia. Defibrillators are used in a variety of settings, including hospitals, ambulances, and public places such as airports and sports arenas.

Defibrillators come in different types, including automated external defibrillators, implanted cardioverter defibrillators (ICDs), and wearable defibrillators. AEDs are the most commonly used and are often found in hospitals, clinics, and emergency response vehicles. They consist of two paddles or pads that are placed on the patient's chest, and an electric shock is delivered when the device detects an abnormal heart rhythm.

ICDs are small devices that are implanted under the skin in the chest and connected to the heart by wires. They constantly monitor the heart's rhythm and deliver shocks if necessary. Wearable defibrillators are devices that are worn outside the body, often by patients who are at risk of sudden cardiac arrest.

Defibrillators are commonly used in emergency situations such as cardiac arrest or when a patient's heart rhythm becomes dangerously irregular. They can help to save lives by quickly restoring the heart's normal rhythm and preventing further damage to the heart and brain. It is important to note that defibrillators should only be used by trained medical professionals or individuals who have received proper training in their use. Improper use of a defibrillator can cause serious harm or even death.

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"Defibrillators." American Heart Association, 26 May 2021, Accessed 14 April 2023.

"Defibrillators." MedlinePlus, U.S. National Library of Medicine, 15 February 2022, Accessed 14 April 2023.

"Defibrillation." StatPearls [Internet], 8 February 2022, Accessed 14 April 2023.