During chest compressions, what depth relative to chest width is recommended?

During chest compressions, what depth relative to chest width is recommended?

• A. 1/2 - 1/3
• B. 1/4
• C. 2/3
• D. 3/4

Answer: (A)

The key idea is that chest compressions need to be deep enough to generate adequate blood flow without causing excessive injury. When measured as a fraction of the chest’s width, the recommended depth is about one-third to one-half of the chest width. This range provides enough compression to help circulate blood to the heart and brain while avoiding the higher risk of rib or sternal injury that comes with deeper presses. In adults, this typically translates to roughly 5 cm (about 2 inches), though the exact depth varies with chest size. Compressing less than one-third reduces perfusion and delays return of spontaneous circulation. Compressing more than about one-half the chest width increases the risk of injury and may not significantly improve blood flow.

The key idea is that chest compressions need to be deep enough to generate adequate blood flow without causing excessive injury. When measured as a fraction of the chest’s width, the recommended depth is about one-third to one-half of the chest width. This range provides enough compression to help circulate blood to the heart and brain while avoiding the higher risk of rib or sternal injury that comes with deeper presses. In adults, this typically translates to roughly 5 cm (about 2 inches), though the exact depth varies with chest size.

Compressing less than one-third reduces perfusion and delays return of spontaneous circulation. Compressing more than about one-half the chest width increases the risk of injury and may not significantly improve blood flow.