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The Chain of Survival concept is designed to show you your role in an emergency procedure. Following each link in the chain in the correct order can greatly increase the patient's chances of survival.
Remember the links in the chain are Early activation of the emergency services, Early CPR, Early Defibrillation and Early Advanced Life Support. The first aider carries out the first two links and sometimes the third AED link, but it is very important not to break the chain, for example if help is not called then the Emergency Medical Services who are the final link will not arrive.