CPR stands for “Cardiopulmonary Resuscitation” and is the act of apply compressions and breaths to pump oxygenated blood flow to the victim’s vital organs so that they can maintain proper function.
Oxygen is carried from the lungs and into the bloodstream where it is then pumped by the heart to all of the vitals organs. If these organs stop received oxygen rich blood, failure, severe damage, and even death can occur.
For instance, if someone is experiencing cardiac arrest where their heart stops beating, then no longer is blood being pumped toward their organs such as the brain. Without this oxygen, the body can not live.
Additionally, if someone’s airway is obstructed and they can not breath but the heart is still beating, oxygen is no longer being pulled into the lungs and transferred to the bloodstream.
CPR is a method to continue proper heart function after it has stopped so that blood may be pumped through the body and a method to breath oxygen into the lungs so it can be absorded into the bloodstream. With these two things done properly, the chances of survival increase dramatically.