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Whilst we are waiting for a defib to be deployed or the ambulance service to arrive on the scene, sometimes we are gonna be in a situation where there is no defib nearby. Also, we are gonna potentially be in a situation where we are not prepared to do mouth to mouth. That may be due to blood, contamination, vomit, or we are just a bit squeamish when doing mouth to mouth. What we are gonna do in these circumstances is what we call compression only. Compression only will keep the brain alive. We have talked about having six to eight minutes worth of oxygen in your blood supply, but it is not going anywhere. If we don't do compressions, that blood supply really does not go anywhere so the brain dies very quickly. You have got roughly 8 minutes to keep this brain alive and CPR is very, very important in keeping the oxygen flow to the brain.

So if you are not prepared to do mouth to mouth, if you are untrained, you do CPR, Chest compression-only CPR. If you are trained or prepared to do mouth to mouth, it is 30 compressions, two breaths. The compressions are exactly the same, central chest, 5 to 6 centimetres in depth at 120 per minute. However, there is no need to count your 30 to 2 because now all we are gonna do is continually non-stop compress the chest. What we are doing now is basically replacing or aiding the circulation that the heart supplies, keeping the brain alive until somebody else can arrive on the scene who either has an AED or an ambulance arrives on the scene. And if we do that, we keep the brain alive and give the patient a much, much better chance of survival. The brain is the target organ for CPR. If the CPR is efficient if the CPR is in the right depth and the right speed, we give that brain a chance of survival.