What does a deeper compression depth in CPR contribute to?

A deeper compression depth in CPR contributes to increased effectiveness of resuscitation because it allows for better blood flow during cardiac arrest. The primary goal of CPR is to maintain adequate circulation to vital organs, especially the brain and heart, until advanced medical help can take over. When compressions are deeper, they generate a greater pressure differential that facilitates blood being effectively pumped out of the heart and into the circulation. This improved blood flow increases the chances of restoring a normal heart rhythm and achieving successful outcomes.

While deeper compressions may also have implications for rescuer fatigue and the risk of complications like rib fractures, the main focus of effective CPR is centered on maximizing circulatory support. Therefore, the relationship between compression depth and the overall success of the resuscitation effort is why option A is the most accurate choice. The other options do not directly highlight the primary objective of CPR, which is delivering effective chest compressions to support circulation and improve survival outcomes.