INITIAL ACTIONS ON SCENE - Chain of survival  
   
The chain of survival is a sequence of four events that must occur quickly to optimise a patient's chance of surviving a heart attack. Early defibrillation is a major link in the chain.  
     
Early access It is crucial that help is sought immediately following a cardiac arrest by phoning 999  
     
Early CPR CPR provides enough circulation to temporarily keep small amounts of oxygenated blood circulating through vital organs. This keeps the heart and brain viable until the AED arrives.  
     
Early defibrillation The purpose of early defibrillation is to re-establish a normal heart rhythm. Scientific research has shown that early defibrillation greatly increases the chance of survival for someone in cardiac arrest  
     
Early ACLS Early advanced cardiac life support is the treatment provided by the paramedics when they arrive.  
     
In a first responder situation, we arrive on scene and are responsible for the second and third links.  
   
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