Chain of Survival

In 1991, the American Heart Association (AHA) published a paper titled:

“Improving Survival from Sudden Cardiac Arrest: The Chain of Survival Concept.” 

This paper identified the idea that all communities should adopt the principle of early defibrillation and that all personnel who are expected, as part of their professional duties, to perform basic CPR, should be equipped with an AED and be trained to operate it.

Since then, ILCOR (International Liaison Committee on Resuscitation) and the AHA have advocated that health professionals who have a duty to respond to a person in cardiac arrest should have a defibrillator available either immediately or within 1 to 2 minutes.

The Chain of Survival depicts the critical actions required to treat life-threatening emergencies, including heart attack, cardiac arrest, stroke, and foreign body airway obstruction. The links within this Chain of Survival include:

Early Access to the emergency response system

It includes early recognition of the cardiac emergency and early notification of rescue personnel via a universal 1-1-2 telephone system as well as an internal alert system within specific facilities to trigger a response by designated trained and equipped personnel.

Early CPR

to support circulation to the heart and brain until normal heart activity is restored.

It is a set of actions that the rescuer performs in sequence to assess and support airway, breathing and circulation.

Early Defibrillation

to treat cardiac arrest caused by Ventricular Fibrillation.

It is the delivery of a shock to the heart to convert the heart's rhythm from Ventricular Fibrillation back to a normal heart rhythm.

Early Advanced Care

relates to the response of highly trained and equipped pre-hospital EMS personnel (paramedics) who can respond to the patient and provide for the administration of drugs, advanced airway procedures, and other interventions and protocols, prior to the arrival of the patient at an advanced care facility.

However, in order for the patient to have the best chance of surviving an out-of-hospital cardiac arrest, CPR and early defibrillation must be provided within the first 4 minutes of the cardiac arrest (the European Resuscitation Council/American Heart Association recommends 3 minutes), followed by Advanced Life Support within the first 8 minutes of the arrest.