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Published 1 May 2025 · For Life First Aid

How to Use a Defibrillator (AED) — A Simple Guide Anyone Can Follow

If someone collapses due to cardiac arrest, using a defibrillator (AED) within minutes can dramatically increase their chances of survival. The good news? AEDs are designed for complete beginners — you do not need medical training to use one.

What Is a Defibrillator (AED)?

An Automated External Defibrillator (AED) is a portable device that:

  • Checks the heart's rhythm
  • Delivers a shock if needed
  • Helps restart the heart

It will only shock if necessary, so it is completely safe to use. See our FAQ for a full explanation of how a defibrillator works.

When Should You Use an AED?

Use an AED if someone is:

  • Unresponsive
  • Not breathing normally
  • Showing signs of cardiac arrest

Do not wait — act immediately.

Step-by-Step: How to Use an AED

1. Turn on the AED

  • Open the lid or press the power button
  • The device will begin giving voice instructions

Follow these instructions exactly.

2. Expose the Chest

  • Remove clothing from the chest
  • Dry the skin if wet

3. Attach the Pads

Place pads exactly as shown on the diagrams:

  • One pad on the upper right chest
  • One pad on the lower left side

The AED will show you where to place them.

4. Let the AED Analyse

  • The device will check the heart rhythm
  • Do not touch the person during this time

5. Deliver Shock (If Advised)

  • If prompted, press the shock button
  • Ensure no one is touching the person

The AED will only advise a shock if it is needed.

6. Resume CPR Immediately

  • Start CPR straight after the shock
  • Continue until emergency services arrive

Not sure how to perform CPR? Read our step-by-step CPR guide.

Why AEDs Are So Important

  • Survival rates drop every minute without defibrillation
  • Using an AED within 3 to 5 minutes can double or triple survival chances
  • CPR alone is often not enough — the heart needs to be restarted

Can Anyone Use a Defibrillator?

Yes — absolutely. AEDs are designed for the general public:

  • Clear voice instructions
  • Visual guides on the pads
  • Automatic rhythm analysis

You cannot accidentally harm someone by using an AED. Read more in our frequently asked questions.

Where Can You Find an AED?

AEDs are commonly located in:

  • Shopping centres
  • Gyms
  • Offices
  • Airports
  • Public buildings

Many are stored in clearly marked wall cabinets. When calling 999 or 112, the operator can also direct you to the nearest AED.

Build Confidence With Training

While AEDs are simple to use, training helps you stay calm under pressure, act quickly, and combine CPR and AED use effectively. On our Cardiac First Responder Course, you will get hands-on experience using AEDs in real-life scenarios.

  • AED training with real equipment
  • CPR practice on manikins
  • How to respond to choking, stroke, and heart attack
  • Real-life emergency scenarios
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Final Thoughts

Using a defibrillator might sound intimidating — but it is actually simple, guided, and safe.

In an emergency, you do not need to be perfect — you just need to act.

If you want to feel fully confident using an AED and performing CPR, book your Cardiac First Responder course today. Hands-on training could make all the difference when it matters most.

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