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Out of hospital cardiac arrest is a catastrophic event, which is equivalent to demise unless prompt cardiopulmonary resuscitation and follow up care are available.
Majority of the cardiac arrests occur at home (80%) and some of them at public places (20%). Only one fifth of them are in a shockable rhythm when the emergency medical services (EMS) arrive. There is a 10% decrease in survival on each passing minute after cardiac arrest.
Bystander initiated CPR improves the chance of survival as it buys time till the arrival of EMS. The chance of receiving bystander CPR varies widely between countries and locations, with 43% in certain countries.