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What Is An Automated External Defibrillator?

An automated external defibrillator, or AED, is a portable device used during sudden cardiac arrest. It analyzes the heart rhythm and delivers an electrical shock when a shockable rhythm is detected. The shock can help the heart return to a more organized rhythm. AEDs are made for public and professional use, with prompts that guide the rescuer.

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What Is An Automated External Defibrillator?

An automated external defibrillator, or AED, is a portable device used during sudden cardiac arrest. It analyzes the heart rhythm and delivers an electrical shock when a shockable rhythm is detected. The shock can help the heart return to a more organized rhythm. AEDs are made for public and professional use, with prompts that guide the rescuer.

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How Does An Automated External Defibrillator Work?

AED pads are placed on the person's bare chest so the device can read the heart rhythm. The AED checks whether a shock is needed and gives voice or screen instructions. Some models ask the rescuer to press a shock button, while others deliver the shock automatically after warning everyone to stand clear. CPR should continue when the AED prompts you to resume compressions.

When Should An AED Be Used?

An AED should be used when a person suddenly collapses, does not respond, and is not breathing normally. Call emergency services right away and start CPR while someone gets the AED. The device will analyze the rhythm before advising a shock. Do not wait for a trained rescuer if an AED is available and the person appears to be in cardiac arrest.

Where Are AEDs Found?

AEDs can be found in airports, schools, gyms, offices, malls, sports facilities, and other public spaces. Some workplaces and community sites keep them in clearly marked cabinets. Pads and batteries expire, so AED programs need routine checks. A ready device should have charged batteries, usable pads, and a status indicator that shows it is working.

AED Safety Basics

No one should touch the person while the AED analyzes the rhythm or delivers a shock. The chest should be bare and as dry as possible before pads are placed. Medication patches should be removed if they are in the pad placement area. After a shock or no-shock message, follow the AED prompts and continue CPR as directed.

Frequently Asked Questions About Automated External Defibrillators

Can Anyone Use An AED?

Yes. AEDs are built with prompts that guide users through each step. Calling emergency services and starting CPR still matter while the AED is being set up.

Will An AED Shock Someone Who Does Not Need It?

The AED analyzes the rhythm before advising a shock. If the rhythm is not shockable, the device will tell you not to shock and will prompt the next step.

Is An AED The Same As A Defibrillator?

An AED is one type of defibrillator. It is designed to analyze the rhythm and guide rescuers with prompts, while hospital defibrillators give clinicians more control.

Should You Stop CPR When The AED Arrives?

Pause CPR only when the AED tells you to stop for rhythm analysis or shock delivery. Resume compressions as soon as the device tells you to continue.

References

Automated External Defibrillators (AEDs). U.S. Food & Drug Administration. https://www.fda.gov/medical-devices/cardiovascular-devices/automated-external-defibrillators-aeds. Date Accessed May 26, 2026.

Treatment of Cardiac Arrest. American Heart Association. https://www.heart.org/en/health-topics/cardiac-arrest/emergency-treatment-of-cardiac-arrest. Date Accessed May 26, 2026.

What Is an AED? American Red Cross. https://www.redcross.org/take-a-class/aed/using-an-aed/what-is-aed. Date Accessed May 26, 2026.

AED Steps. American Red Cross. https://www.redcross.org/take-a-class/aed/using-an-aed/aed-steps. Date Accessed May 26, 2026.

Automated External Defibrillators: Do You Need an AED? Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/heart-arrhythmia/in-depth/automated-external-defibrillators/art-20043909. Date Accessed May 26, 2026.