What depth should chest compressions be for adult CPR?

• A. 1.5 inches
• B. 2-2.4 inches
• C. 3-3.5 inches
• D. 4 inches

Answer: (B)

Chest compression depth determines how much blood you can push out of the heart with each squeeze, driving perfusion to the brain and vital organs. For adults, aim for about five to six centimeters (roughly 2 to 2.4 inches). This range strikes a balance: it’s deep enough to generate the forward blood flow needed for adequate perfusion, but not so deep as to excessively risk rib or sternal injury. A shallower compression, around 1.5 inches, often falls short in producing enough blood flow. Deeper compressions beyond about 2.4 inches increase injury risk without providing meaningful extra benefit to perfusion. Maintain full chest recoil between compressions and a rate about 100–120 per minute to support effective circulation.