What Is an AED and How Does It Save Lives?
An automated external defibrillator (AED) is a lifesaving device that can help restore a normal heart rhythm during certain types of cardiac arrest.
Knowing how to use an AED alongside CPR can significantly improve a person's chance of survival during an emergency. Modern AEDs are designed to be simple to operate, meaning even people without medical backgrounds can use them with confidence.
What Does AED Stand For?
AED stands for Automated External Defibrillator. It is a portable electronic device that analyses the heart's electrical activity and, when appropriate, delivers a controlled electrical shock.
This shock may help the heart return to a normal rhythm when someone is experiencing certain types of cardiac arrest.
How Does an AED Work?
During cardiac arrest, the heart may stop pumping blood effectively. In some cases, the heart enters an abnormal rhythm that can be corrected with an electrical shock.
An AED works by:
- Analysing the person's heart rhythm
- Determining whether a shock is needed
- Delivering a shock if appropriate
- Providing instructions to continue CPR
When Should an AED Be Used?
An AED should be used when a person is:
- Unconscious
- Not responding
- Not breathing normally
An AED should be used as soon as possible alongside CPR. Every minute without CPR and defibrillation can reduce the chance of survival during cardiac arrest.
How to Use an AED: Step-by-Step
Step 1: Check the Situation
Ensure the area is safe before approaching the person. Check whether they are responsive and breathing normally.
Step 2: Call Emergency Services
Call 000 in Australia or ask someone nearby to make the call. Request an AED if one is available.
Step 3: Begin CPR
Start chest compressions immediately while another person retrieves the AED. Do not delay CPR while waiting for the device.
Step 4: Turn On the AED
Follow the AED's voice prompts. The device will guide you through each step.
Step 5: Attach the Pads
Place the AED pads on the person's bare chest as shown in the diagrams on the device. Ensure nobody is touching the person while the AED analyses their heart rhythm.
Step 6: Follow the AED Instructions
If the AED advises a shock, make sure everyone is clear before delivering it. Continue CPR when instructed until emergency services arrive.
Can Anyone Use an AED?
Yes. AEDs are designed for use by members of the public, including people who have not completed medical training.
The device provides step-by-step instructions and will not deliver a shock unless it detects a heart rhythm where defibrillation may help.
Do AEDs Replace CPR?
No. CPR and AED use work together.
- CPR helps maintain blood circulation and oxygen delivery
- An AED helps restore a normal heart rhythm when appropriate
- Both should be used as quickly as possible during cardiac arrest
Where Can You Find AEDs?
AEDs are increasingly available in public locations and workplaces, including:
- Shopping centres
- Schools and universities
- Sports facilities
- Community buildings
- Workplaces
- Airports and transport hubs
Why AED Training Matters
Although AEDs are designed to be easy to use, many people hesitate during an emergency because they lack confidence.
CPR and AED training provides hands-on experience so people know what to do, where to place pads, and how to respond calmly when every second matters.
Common AED Questions
Can an AED shock someone who does not need it?
No. AEDs analyse the heart rhythm and will only advise a shock when it is appropriate.
Can AEDs be used on children?
Some AEDs can be used on children with appropriate paediatric settings or pads. Training helps you understand how to respond safely in different situations.
Do I need CPR training to use an AED?
No, but CPR training is strongly recommended because CPR and AED use are most effective when performed together.
Heart Restart provides practical CPR and first aid training in Melbourne, delivered by experienced healthcare professionals.
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