What is the primary purpose of chest compressions in CPR?

The primary purpose of chest compressions in CPR is to circulate oxygenated blood through the body. During cardiac arrest, the heart stops pumping blood effectively, which leads to a decrease in blood flow to vital organs. Chest compressions help create pressure within the chest cavity, pushing blood out of the heart and into the circulatory system, thereby maintaining some level of blood flow to the brain and other essential organs. This circulation is crucial for keeping tissues alive until advanced medical help can restore the heart's function.

While other aspects like clearing the airway or assisting with breathing are important components of CPR, their roles are secondary to the primary need for circulation. The effectiveness of CPR is largely determined by the quality and depth of the chest compressions administered, which directly impacts the chance of survival for the individual in cardiac arrest.