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How Do You Use the Chain of Survival?

The concept of the Chain of Survival can help a bystander help someone who suffers from an out-of-a-hospital cardiac arrest. Written in the American Heart Association’s Heart Disease and Stroke Statistics - 2018 Update, there are more than 356,000 cases of out-of-hospital cardiac arrests and nearly 90% of them are fatal.  The Chain of Survival is a four-step, interlocking method that reduces a patient fatality to the disease.