Canadian Red Cross Basic Life Support (BLS) Practice Test

The recommended compression depth for adult CPR is about 2 inches (5 cm). This depth is crucial because it ensures that adequate blood flow is generated to vital organs, particularly the brain and heart, during chest compressions. The goal of CPR is to mimic the heart's pumping action and restore circulation, and compressions that are too shallow may not create enough pressure to achieve this.

The 2-inch depth is based on studies that show this level provides effective blood flow while minimizing the risk of injury to the patient's ribcage or organs. Compressions performed at this depth also maintain a balance between effectiveness and safety, allowing an adequate rhythm and rate that can be sustained over time during resuscitation efforts. Therefore, following this guideline is essential for maximizing the chances of survival in an adult who has suffered a cardiac arrest.