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. When used alongside CPR, an AED can significantly improve a person's chance of survival.
Modern AEDs are designed to be simple to operate, meaning members of the public can use them confidently even without medical training. The device provides clear instructions and will only deliver a shock when it detects a rhythm where defibrillation may help.
AED: Key Things to Know
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 delivers an electrical shock when appropriate.
During certain types of cardiac arrest, the heart may enter an abnormal rhythm that prevents it from pumping blood effectively. An AED can analyse this rhythm and determine whether defibrillation may help.
How Does an AED Work?
An AED is designed to guide users through the process of responding to cardiac arrest. Once switched on, the device provides voice instructions and analyses the person's heart rhythm.
- Analyses the heart rhythm
- Determines whether a shock is required
- Delivers a shock if appropriate
- Provides instructions to continue CPR
- Supports the responder throughout the emergency
Heart Restart Tip
Do not wait for perfect conditions before using an AED. The device is designed to guide you. The most important actions are calling Triple Zero (000), starting CPR and applying the AED as soon as possible.
When Should an AED Be Used?
An AED should be used when someone is:
- Unconscious
- Not responding
- Not breathing normally
An AED should be used as soon as possible alongside CPR. In a cardiac arrest, every minute without CPR and defibrillation can reduce the likelihood of survival.
How to Use an AED: Step-by-Step
AEDs are designed to be simple to operate. The following steps provide a general overview of how an AED is used during an emergency.
Step 1: Check Safety and Assess the Person
Make sure the area is safe before approaching. Check whether the person responds and whether they are breathing normally.
Step 2: Call Emergency Services
Call Triple Zero (000) 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 stop CPR while waiting for the device.
Step 4: Turn On the AED
Switch on the AED and follow the voice prompts. The device will guide you through each stage.
Step 5: Attach the Pads
Place the AED pads on the person's bare chest as shown on the device diagrams. Ensure nobody is touching the person while the AED analyses their heart rhythm.
Step 6: Follow AED Instructions
If the AED advises a shock, ensure everyone is clear before delivery. Continue CPR when instructed until emergency services arrive.
Can Anyone Use an AED?
Yes. AEDs are designed to be used by members of the public, including people who do not have a medical background.
The device provides clear voice instructions and analyses the heart rhythm automatically. It will only recommend a shock when it detects a rhythm where defibrillation may be beneficial.
Do AEDs Replace CPR?
No. CPR and AED use are most effective when used together during a cardiac emergency.
- CPR helps maintain blood circulation and oxygen delivery
- An AED helps correct certain abnormal heart rhythms
- Both actions should begin as quickly as possible
Where Can You Find AEDs?
AEDs are becoming increasingly common in public places, workplaces and community facilities. Knowing where an AED is located can save valuable time during an emergency.
- Workplaces and offices
- Schools and universities
- Shopping centres
- Sports clubs and recreation facilities
- Community centres
- Transport hubs and public spaces
Why AED Training Matters
Although AEDs are designed to be simple, many people hesitate during emergencies because they lack confidence or have never used one before.
Practical CPR and AED training helps participants understand how to respond, where AED pads are placed, and how to work through a stressful emergency situation.
Learn CPR and AED Skills With Confidence
Heart Restart provides practical CPR and first aid training throughout Melbourne, delivered by experienced healthcare professionals. Our courses combine essential knowledge with hands-on practice to help participants respond confidently during emergencies.
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Book an AppointmentThis information is intended as general guidance only and should not replace accredited CPR training or professional medical advice. Always call Triple Zero (000) in a medical emergency.