The Chain of Survival is a treatment method designed by the American Heart Association to treat victims with sudden cardiac arrest (SCA). In this condition, the victim’s heart twitches irregularly, stopping the flow of blood and oxygen throughout the body. SCA is fatal unless medical intervention is provided in a timely manner. The chain of Survival’s structure gives rescuers a protocol to follow, increasing the victim’s chance for survival. Each minute that passes between the onset of symptoms and intervention increases the victim’s chance of death by up to 10%. There are five steps in the chain:
The procedures used when administering CPR depend on a few variables. The victim's age and the number rescuers are the most important. Infant CPR is used with victims under the age of one. Child CPR is used with victims between the ages of 1 and puberty. Adult CPR is used on victims who have entered puberty and older.
The protocol for CPR assumes that two rescuers are present: one to administer CPR and one to retrieve the AED.
Protocol for Two Rescuers
In many situations, a team of rescuers will be present, allowing for further delegation of tasks. Rescuer A can call 911 while Rescuer B begins compressions and Rescuer C prepares to administer ventilations. Simultaneously, Rescuer D is retrieving the AED and preparing for its use. Working as a team allows the victim to receive higher quality CPR in a timelier manner.
At the same time, a rescuer may find himself alone when dealing with an emergency. If the rescuer is alone, he should call 911 before beginning CPR unless the victim suffered an injury or drowning. In those cases, one minute of CPR should be administered before pausing to call 911. If an infant or child is found unconscious, deliver two minutes of CPR before pausing to call 911.
Administering CPR to a child or adult
Ask the victim, "are you ok?" to check for consciousness. Try tapping on the shoulders to stimulate the victim. If the victim is truly not breathing and requires CPR, continue with the sequence