When performing CPR, how deep should compressions be for adults?

When performing CPR on adults, compressions should be at least 5 cm (2 inches) deep. This depth is essential because it ensures that enough pressure is applied to the chest to facilitate the effective circulation of blood, which is critical in a cardiac arrest scenario.

CPR compressions aim to mimic the heart's pumping action, and research has shown that a minimum depth of 5 cm optimally compresses the heart and promotes adequate blood flow to vital organs. Compressions less than this may not generate sufficient blood flow, reducing the effectiveness of CPR in resuscitating the individual.

Compressions deeper than 5 cm can certainly occur, but it's important to avoid excessive depth, as it might lead to injuries such as rib fractures. Therefore, the parameter of at least 5 cm balances effective resuscitation while minimizing the risk of harm.