If someone near you collapses from sudden cardiac arrest, would you know what to do? In these moments, a defibrillator—or AED (Automated External Defibrillator)—can mean the difference between life and death. This beginner’s guide will teach you how to find, access, and use a defibrillator, whether in public or at home, with no medical training required.
We’ll walk you through how to use an AED on adults and children, what’s included in an AED pack, which brands to trust, and answer the most common question: “Are defibrillators safe to use?”
What Is a Defibrillator (AED)?
A defibrillator is a medical device that sends a controlled electric shock to the heart to restore a normal rhythm. AEDs are specifically designed for public use during sudden cardiac arrest (SCA)—a condition where the heart suddenly stops beating properly. Unlike a heart attack, SCA requires immediate intervention with CPR and a defibrillator.
Types of Defibrillators:
- Automated External Defibrillators (AEDs): Publicly accessible, beginner-friendly, with voice instructions.
- Manual Defibrillators: For hospital or ambulance staff.
- Implantable Defibrillators (ICDs): Surgically placed in high-risk patients.
This guide focuses on AEDs, as they’re found in public spaces and can be used by anyone.
Where to Find a Defibrillator (AED) Near You
Knowing where to find an AED can save precious time. In many cities, AEDs are legally required in public buildings, transportation hubs, and workplaces.
Typical AED Locations:
- Airports, train stations, and public transit centres
- Schools, universities, and childcare centres
- Gyms, sports facilities, and swimming pools
- Hotels, shopping malls, and supermarkets
- Office buildings and factories
- Community centres, libraries, and places of worship
Look for a green sign with a heart and lightning bolt—this universally identifies an AED station. If unsure, ask a staff member or security guard for help.
Pro tip: Some regions use AED apps or registries (like GoodSAM or PulsePoint) to map AEDs near you.
How to Access a Defibrillator in an Emergency
When someone collapses, call emergency services (999 or 911) immediately. While CPR begins, locate the nearest AED. Many are stored in wall cabinets.
If the AED cabinet is unlocked:
- Open the door and remove the device.
- Ignore any alarm—this alerts nearby responders, not the police.
If locked:
- Call emergency services. The dispatcher will give you the access code.
- Follow the instructions and stay on the line until help arrives.
Top AED Brands and What Makes Them Different
While all AEDs serve the same purpose, some have extra features that make them easier or more advanced for lay responders. Here are the most popular defibrillator brands:
- Zoll AED Plus: Offers real-time CPR coaching and compression depth feedback.
- Philips HeartStart: Lightweight and beginner-friendly with audio and visual prompts.
- Physio-Control LIFEPAK: Durable and used by professionals, but intuitive enough for public use.
- Defibtech Lifeline: Simple two-button operation and long battery life.
- Cardiac Science Powerheart: Daily self-checks and clear instructions for rescuers.
Some models offer child mode or separate pediatric electrode pads, which are crucial when treating young children.
What’s Inside an AED Pack?
An AED kit usually includes several tools to assist in a cardiac emergency:
- The AED device itself
- Adult electrode pads (and pediatric pads, if included)
- CPR face shield or mask
- Scissors (to cut through clothing)
- Razor (to shave the chest if needed)
- Gloves and antiseptic wipes
- A small towel or gauze to dry the chest
Always follow the diagram on the pads to place them correctly.
Step-by-Step: How to Use a Defibrillator (AED)
If you’re wondering how to use an AED for the first time, follow these simple steps. The device gives clear voice prompts, and it’s designed for people with zero training.
- Call emergency services.
- Begin CPR. Push hard and fast in the centre of the chest.
- Turn on the AED. Press the power button or open the lid.
- Expose the chest and attach pads. Follow the diagram on the packaging.
- Let the AED analyse. Don’t touch the person during analysis.
- Deliver shock (if advised). Stand clear and press the shock button if told to.
- Continue CPR. Follow prompts until help arrives or the person revives.
How to Use a Defibrillator on Children and Infants
Children (1–8 years old):
- Use pediatric pads if available.
- Enable “child mode” on the AED if applicable.
- Apply pads on the front and back of the chest (if the chest is too small).
Infants (under 1 year):
Use pediatric pads if available. If not, adult pads can be used, placed front and back. Always consult emergency services and follow their instructions.
Adults (8+ years):
Use standard adult pads. Place one pad on the upper right chest and the other on the lower left rib cage.
Are Defibrillators Safe to Use?
Yes, AEDs are extremely safe. They are programmed to only deliver a shock if it’s needed and guide you through every step.
Why You Don’t Need to Worry:
- You can’t harm someone by using an AED incorrectly. It won’t shock unless the rhythm is shockable.
- Good Samaritan laws protect people who assist in emergencies in most countries.
- Clear voice instructions walk you through everything.
What to Do After Using a Defibrillator
- Leave the pads in place until emergency services take over.
- Report the incident to the site or AED program coordinator.
- Replace used pads and check the battery.
- Wipe down and sanitise the unit.
- Log the event, especially if the AED is part of a tracked registry.
Conclusion: Anyone Can Use a Defibrillator
Now that you know how to find and use a defibrillator, you are better prepared to save a life. AEDs are made for the public—no medical degree required. They’re smart, safe, and shockingly simple to use.
We encourage you to take a few minutes today to find the nearest AED in your home, office, or gym. It could save a loved one tomorrow.
