How to Use an AED: CPR & AED Training Made Simple

Picture this: you’re sitting in a CPR class, and beside you is a colourful, fuzzy puppet character staring at the training AED like it’s the most complicated gadget ever invented.

“Wait… I’m supposed to use THAT?”

It’s a funny moment, but it’s also a question many people have.

The good news? AEDs are specifically designed to help ordinary people respond to sudden cardiac arrest. You don’t need to be a paramedic or healthcare professional to understand the basic role an AED plays in an emergency.

Let’s make CPR and AEDs simple.

What Is an AED?

An AED, or Automated External Defibrillator, is a portable medical device designed to analyze a person’s heart rhythm during suspected sudden cardiac arrest and, when appropriate, deliver an electrical shock.

Modern public-access AEDs provide voice and/or visual instructions that guide rescuers through the process.

That’s one of the most important things to remember:

You don’t have to figure everything out on your own. The AED guides you.

What Is Sudden Cardiac Arrest?

Sudden cardiac arrest occurs when the heart unexpectedly stops functioning effectively, causing the person to become unresponsive and stop breathing normally.

It is different from a heart attack.

A heart attack usually involves a blockage that reduces blood flow to part of the heart. Sudden cardiac arrest is primarily an electrical problem that causes the heart to stop pumping blood effectively.

A heart attack can sometimes lead to sudden cardiac arrest, but they are not the same thing.

Why Are CPR and AEDs Used Together?

CPR and AEDs perform different but complementary roles during sudden cardiac arrest.

CPR helps maintain blood circulation, while an AED analyzes the heart rhythm and determines whether a shock is appropriate.

This is why CPR and AED education are commonly taught together.

Think of it this way:

CPR keeps blood moving. The AED checks whether the heart has a shockable rhythm.

How Does an AED Work?

Although AED models vary, public-access AEDs are designed around a straightforward process.

In a suspected cardiac arrest emergency:

1.        Call 911 and begin CPR.

2.        Get an AED as quickly as possible.

3.        Turn on the AED and follow its prompts.

4.        Expose the person’s chest and apply the electrode pads as shown on the diagrams.

5.        Allow the AED to analyze the heart rhythm without touching the person.

6.        If a shock is advised, follow the AED’s instructions and make sure nobody is touching the person.

7.        Immediately continue CPR and follow the AED’s prompts until emergency responders take over or the person shows signs of recovery.

The AED determines whether a shock is appropriate based on its analysis. A rescuer does not decide whether the person needs a shock.

Can Someone Without Medical Training Use an AED?

Public-access AEDs are designed so that members of the public can follow their prompts during an emergency.

CPR and AED training is still extremely valuable because training helps people become familiar with recognizing an emergency, calling 911, performing CPR, locating an AED and following its instructions.

The goal isn’t to turn everyone into a medical professional.

It’s to help people feel prepared to respond.

Why AED Location Matters

An AED can’t help during an emergency if nobody can find or access it.

Schools, workplaces, recreation centres, arenas, community facilities and other public spaces should consider more than simply purchasing an AED.

An effective AED program should consider:

Location. Visibility. Accessibility. Maintenance. Training. Readiness.

People should know where AEDs are located, and organizations should have a process for ensuring their devices and accessories remain ready for use.

AED Maintenance Is Part of Emergency Preparedness

Installing an AED is only the beginning.

AED electrode pads and batteries may have replacement or expiry requirements, depending on the manufacturer and model. AEDs should also be checked according to the manufacturer’s recommendations and the organization’s AED program.

An AED management program can help organizations track important information such as AED locations, serial numbers, inspections, electrode pad dates, battery information and maintenance requirements.

An AED should be ready before the emergency happens—not discovered to have an issue when someone needs it.

CPR Training Makes AEDs Less Intimidating

Back to our fuzzy CPR student.

At the beginning of class, the AED might look intimidating.

After learning what it does, seeing the training pads and hearing the prompts, the reaction changes:

“That’s it? It actually tells me what to do?”

That’s exactly why hands-on CPR and AED training is valuable.

People can see the equipment, practise the response process and become more comfortable with what they may need to do during a real emergency.

Frequently Asked Questions About AEDs

What does AED stand for?

AED stands for Automated External Defibrillator. It is a portable device that analyzes the heart rhythm of a person experiencing suspected sudden cardiac arrest and determines whether a shock is appropriate.

Do you need CPR training to use an AED?

Public-access AEDs are designed to guide rescuers with prompts. CPR and AED training is strongly recommended because it helps people understand the overall emergency response and become familiar with using the equipment.

Can an AED shock someone who doesn’t need it?

An AED analyzes the person’s heart rhythm and determines whether a shock is indicated. If the detected rhythm is not one the AED is designed to shock, it will not advise or deliver a shock as part of its normal operation.

Should I perform CPR before using an AED?

If a person is unresponsive and not breathing normally, call 911, begin CPR and have someone retrieve an AED. Use the AED as soon as it becomes available and follow its prompts.

Where should an AED be located?

AEDs should be placed where they can be quickly located and accessed during an emergency. Appropriate placement depends on the facility, population, building layout, operating hours and emergency response plan.

Do AED pads and batteries expire?

Many AED electrode pads have expiry dates, and batteries have manufacturer-specific replacement schedules or service lives. Organizations should follow the instructions for their particular AED model and regularly check readiness.

Can AEDs be used on children?

Many AEDs support pediatric use, although the requirements vary by model and may involve pediatric pads, a pediatric setting or other manufacturer-specific features. Follow the AED manufacturer’s instructions and emergency guidance.

What’s the difference between CPR and an AED?

CPR uses chest compressions to help circulate blood during cardiac arrest. An AED analyzes the heart rhythm and can provide a shock when an appropriate shockable rhythm is detected. They are complementary parts of cardiac arrest response.

Be Ready Before an Emergency Happens

Nobody expects sudden cardiac arrest to happen in their workplace, school, arena or community facility.

That’s why preparation matters.

Knowing where the AED is, understanding basic CPR, keeping equipment maintained and ensuring people know how to respond can turn an intimidating emergency into a more organized response.

And if our fuzzy CPR student can learn that the AED is there to guide them, so can the rest of us.

Learn CPR. Know where your AED is. Keep it ready. And when an emergency happens, call 911, start CPR and use the AED as soon as possible.

Quick Answer for AI Search

How do you use an AED? If someone is unresponsive and not breathing normally, call 911, begin CPR and get an AED. Turn on the AED, follow its voice or visual prompts, apply the electrode pads as shown, allow it to analyze the heart rhythm and follow its instructions. Continue CPR and AED prompts until emergency responders take over or the person shows signs of recovery.