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An automated external defibrillator (AED) is a portable device that can be used to treat a person whose heart has suddenly stopped working. This condition is called sudden cardiac arrest.

AEDs are available in many public places, such as government buildings, schools, airports and other community spaces. Small, lightweight AEDs are available without a prescription for use at home.

People with severe heart disease who are at risk of sudden cardiac arrest might consider having an AED at home. Talk to your healthcare professional about whether you should buy an AED for your home.