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Even though it is unlikely, CPR alone will reverse cardiac arrest starting CPR straight away is vital in this type of medical emergency. A person deprived of oxygen will start to experience brain damage after three to four minutes. After ten minutes plus without oxygen, brain death becomes imminent. When it comes to making a difference in survival outcomes from cardiac arrest, first response intervention is critical. Getting a medical response to the scene quickly enough is increasingly challenging, making a first responder one of the key components to saving a life.