The Definition of Automated External Defibrillator (AED)

Definition of Automated External Defibrillator (AED)

An automated external defibrillator (AED) is a portable, battery-powered device that analyzes a person's heart rhythm through adhesive electrode pads and, if it detects a shockable rhythm such as ventricular fibrillation, delivers or prompts the user to deliver an electric shock to restore a normal rhythm. AEDs give spoken and visual instructions so trained responders and bystanders can use them during sudden cardiac arrest, together with CPR, before emergency medical services arrive.

Key Facts About AEDs

• Chances of surviving sudden cardiac arrest fall with every minute that passes without CPR and defibrillation.
• OSHA has no general requirement for workplace AEDs but recognizes them as an important part of first aid and emergency response programs.
• Many states require AEDs in certain facilities, such as schools, health clubs and some public buildings.
• A common placement goal is that an AED can be reached and brought back to a victim within about three minutes.
• All U.S. states have Good Samaritan or AED laws that give some protection to people who use an AED in good faith.

Example of an AED

A worker collapses on a manufacturing floor and isn't breathing normally. A coworker starts CPR while another calls 911 and brings the AED from the wall cabinet near the break room. The AED advises a shock, the responders deliver it, resume CPR as instructed, and the worker regains a pulse before paramedics arrive.

How to Set Up a Workplace AED Program

1. Assess sites for cardiac arrest risk, worker numbers and EMS response times.
2. Place AEDs in visible, signed, accessible locations near high-occupancy and high-risk areas.
3. Train first aid responders in CPR and AED use, and refresh training regularly.
4. Include AEDs in emergency response plans and drills.
5. Check each AED's status indicator regularly and replace pads and batteries before they expire.
6. Register AEDs with local EMS where available, and follow state program requirements.

Related Terms

• First Aid
• Electrocution
• Muster Point
• Lone Worker

Frequently Asked Questions: AED

Are AEDs required in the workplace?

Federal OSHA does not require AEDs in most workplaces, but some states and local codes require them in specific types of facilities, and many employers include them as part of a reasonable first aid program, especially where EMS response may be slow.

Can someone without training use an AED?

Yes. AEDs are designed for lay rescuers and give step-by-step voice prompts, and they will only deliver a shock if they detect a shockable rhythm. Training still improves speed and confidence and is strongly recommended.

How should an AED be maintained?

Follow the manufacturer's instructions: check the readiness indicator on a regular schedule, keep the cabinet accessible, replace electrode pads and batteries by their expiration dates, and restock supplies such as razors and gloves after each use.