If you have someone with you, send them to dial 999 (or 112) for an ambulance immediately.
If you are alone dial 999 (or 112) for an ambulance immediately and then return to help the casualty.
Give 30 chest compressions
Place heel of your hand in the centre of the chest.
Place other hand on top and interlock fingers.
Keeping your arms straight and your fingers off the chest, press down by 5-6 cm. then release the pressure, keeping your hands in place.
Repeat the compressions 30 times, at a rate of between 100 and 120 per minute.
Give 2 rescue breaths.
Ensure the airway is open.
Pinch nose firmly closed.
Take a deep breath and seal your lips around the casualty’s mouth.
Blow into the mouth until the chest rises.
Remove your mouth and allow the chest to fall.
Repeat once more.
Continue resuscitation, 30 compressions to 2 Rescue Breaths.
Do not stop unless:
Emergency help arrives and takes over.
The casualty breathes normally, or you become so exhausted that you cannot carry on.
If you are alone, call an ambulance as soon as you know the casualty is not breathing - unless unconsciousness is due to drowning.
If two rescuers with the knowledge of CPR are available, change every 2 minutes with minimal disruption.
If you are unable or unwilling to give rescue breaths, give chest compressions only. Continue at a rate of between 100 and 120 per minute.