Santa Clara County Emergency Medical Services (EMS) Practice Exam

The recommended depth of chest compressions for adults during CPR is between 2 and 2.4 inches. This specific range is crucial for effective chest compressions, as it allows for adequate blood flow to the heart and brain during cardiac arrest. Compressions within this depth range ensure that the heart is sufficiently compressed to help restore circulation, while also minimizing the risk of injury to the ribs and internal organs. Research shows that compressions deeper than 2.4 inches can increase trauma risk without significantly improving blood flow, while compressions shallower than 2 inches are less effective in generating the necessary pressure to pump blood. Thus, adhering to the guideline of 2 to 2.4 inches maximizes the chances of survival and recovery for a patient in cardiac arrest.