The Chain of Survival is the sequence of events that connects a victim of abrupt cardiac arrest with survival. The first link in this chain emphasizes the significance of identifying those who are at risk for cardiac arrest and calling for assistance in the hopes that prompt care will avert arrest. The major links show the combination of cardiopulmonary resuscitation (CPR) and defibrillation as the essential elements of early resuscitation to recover life. Immediate CPR can increase survival from VF by two to three times. Giving merely chest compressions during CPR is preferable to not doing it at all. Cardiopulmonary resuscitation and defibrillation administered within 3 to 5 minutes of collapse after VF can result in survival rates of 49 to 75 percent. 10–12% fewer people will survive to be discharged for every minute they wait before receiving defibrillation. Effective post-resuscitation care, the last in the Chain of Survival, aims to preserve function, especially of the heart ...