Using an AED is straightforward. The device is designed for bystanders with no medical training and gives clear spoken and visual instructions at every step.
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Switch the AED on. Most devices power on when you open the lid or press a button.
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Follow the spoken instructions. The AED will tell you exactly what to do.
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Attach the pads. Remove or cut through clothing to expose the bare chest. Peel the pads from their backing and attach them in the positions shown in the pictures on the pads themselves \u2014 one below the right collarbone, one on the left side below the armpit.
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Let the AED analyse the heart rhythm. Stay still and make sure no one is touching the person while the AED analyses. It will tell you not to touch.
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Deliver a shock if advised. If a shock is needed, the AED will charge and tell you to press the shock button (or, on fully automatic devices, will deliver the shock itself). Make sure no one is touching the person before pressing the button.
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Resume CPR immediately. As soon as the shock is delivered, restart chest compressions. The AED will prompt you to continue CPR and will analyse the rhythm again after two minutes.
If the AED advises no shock is needed, continue CPR. The AED will reassess regularly and advise if a shock becomes appropriate.
You cannot accidentally shock someone who does not need it \u2014 the AED will only allow a shock if the rhythm requires it.