During adult CPR, what is the recommended chest compression rate and depth?

• A. 60-80 per minute; depth 1 inch
• B. 100-120 per minute; depth 1.5 inches
• C. 100-120 per minute; depth about 2 inches
• D. 120-140 per minute; depth 2 inches

Answer: (C)

The key idea is delivering high-quality chest compressions that maximize blood flow during CPR. For adults, the recommended pace is 100–120 compressions per minute, and the depth should be about 2 inches (roughly 5 cm). This combination provides enough forward pressure to generate circulation while allowing the chest to recoil fully between compressions. Pushing faster than 120 can shorten the refill time, reducing stroke volume, and compressing only about 1.5 inches is too shallow to generate adequate perfusion. Similarly, a rate of 120–140 per minute may be too fast to maintain effective chest compressions, even though the depth is appropriate. Keeping compressions within this rate and depth supports better chances of perfusion to the heart and brain.