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During a cardiac arrest, the heart continues to beat but in an uncoordinated way. This means it no longer pumps blood to the brain and other key organs effectively. Delivering an electronic shock to the heart can restore a normal rhythm. You should only use an Automated External Defibrillator (AED) if you've been trained to use one and can perform cardiopulmonary resuscitation (CPR). The AED is attached to the person's chest using adhesive pads. It analyses the casualty's heart rhythm automatically and advises the operator on whether an electronic shock is required. The shock is delivered by pressing a button on the AED. Actions- Call 999
- Continue with CPR while the AED is prepared and the adhesive pads are attached
- The AED will give a series of visual and verbal prompts as soon as it's switched on
- Follow the prompts until the emergency services arrive and take over
Further actionsIf the casualty starts breathing normally, place them in the recovery position. Leave the AED attached.
This article was reviewed by the British Red Cross in April 2007.
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