During CPR, how deep should compressions be on an adult?

During CPR on an adult, chest compressions should be at least 2 inches deep. This depth is vital because it allows for effective blood circulation during cardiac arrest. Proper compression depth helps to create enough pressure in the chest cavity to push blood out of the heart and into the vital organs, which is essential for survival until advanced medical help arrives. Compressions that are too shallow may not adequately perfuse the heart and brain, reducing the chances of a successful outcome.

While the full depth of the chest is important to consider, the standard guideline specifies at least 2 inches to ensure a balance between effective compressions and the ability to allow the chest to fully recoil between compressions, which is also crucial for optimal blood flow.