When to Use an AED
Learn when to use an AED, how it works, and how CPR and defibrillation can save a life. This guide explains sudden cardiac arrest response and AED use in workplaces and community settings across Australia.
An Automated External Defibrillator (AED) is used when a person is experiencing sudden cardiac arrest. This occurs when the heart stops beating effectively, and the person becomes unresponsive and is not breathing normally.
An AED should be used immediately in this situation. Early defibrillation, combined with CPR, significantly improves the chances of survival.
AEDs are designed to be safe, simple, and easy to use. The device provides clear voice instructions and will only deliver a shock if it is required, making it suitable for use by members of the public.
If someone collapses, call emergency services immediately, begin CPR, and ask someone to locate an AED. Turn the device on and follow the prompts while continuing chest compressions.
How to Use an AED
Ensure the scene is safe
Check the person is unresponsive and not breathing normally
Call emergency services immediately
Begin CPR
Turn on the AED
Attach the pads to the chest as shown
Follow the voice prompts
Deliver a shock if advised
Continue CPR until help arrives
Signs of Sudden Cardiac Arrest
A person may be experiencing sudden cardiac arrest if they:
• Collapse suddenly
• Are unresponsive
• Are not breathing or not breathing normally
• Show occasional gasping
If these signs are present, start CPR and use an AED as soon as possible.
Where Can You Find an AED in Australia
Automated External Defibrillators (AEDs) are widely available across workplaces and public spaces in Australia, including Melbourne and surrounding areas. They are installed in locations where people gather so they can be accessed quickly in an emergency.
AEDs are commonly found in workplaces, schools, universities, gyms, sporting facilities, shopping centres, airports, and community buildings. Many organisations include AEDs as part of their workplace health and safety planning.
Devices are usually stored in clearly marked cabinets or wall mounted units with visible signage, making them easy to locate when needed.
Knowing where your nearest AED is located before an emergency can save valuable time and significantly improve outcomes.
When Not to Use an AED
An AED should not be used if the person is conscious, responsive, or breathing normally.
If a person is unresponsive and not breathing normally, it is appropriate to use an AED. The device will automatically assess the heart rhythm and will only deliver a shock if it is required.
AEDs include built in safety features that prevent unnecessary shocks. If a shock is not needed, the device will instruct you to continue CPR.
In an emergency, it is safer to apply the AED and follow the prompts than to delay treatment.
Can Anyone Use an AED
AEDs are designed for public use and can be safely used by anyone, even without prior training.
Once turned on, the device provides clear step by step instructions on pad placement, rhythm analysis, and when to stand clear. It will only deliver a shock if it is safe and required.
This makes AED use simple, guided, and safe in high pressure situations.
Using an AED early, together with CPR, can make a critical difference before emergency services arrive.
Why Early Action Matters
When sudden cardiac arrest occurs, every minute without CPR and defibrillation reduces the chance of survival.
CPR helps maintain blood flow to the brain and heart, while an AED can restore a normal heart rhythm. Acting quickly in the first few minutes can significantly improve survival outcomes.
Emergency services are essential, but immediate action by people on scene is often the most important factor.
First Aid and CPR Training in Victoria
Victorian Institute of Health is a not for profit organisation committed to improving community safety through accessible first aid and CPR training across Victoria.
Our nationally recognised courses are designed for workplaces and community organisations, with a focus on practical skills and real world application. Training can be delivered on site or at arranged venues, including Melbourne and surrounding areas, with flexible options such as blended learning.
Learn These Skills with Confidence
Want to learn how to use an AED with confidence?
Victorian Institute of Health provides first aid and CPR training for workplaces and community organisations across Victoria. Explore our training options or submit a request to organise a session for your team.
Frequently Asked Questions
Do you need training to use an AED?
No. AEDs are designed for public use and provide clear step by step instructions.
Is using an AED safe?
Yes. The device will only deliver a shock if it is required.