According to the 2015 American Red Cross Guidelines for CPR, what is the recommended compression depth for adults?

The recommended compression depth for adult CPR, as stated in the 2015 American Red Cross Guidelines, is at least 2 inches. This depth is crucial because it allows for adequate blood circulation to the heart and brain during cardiac arrest. Compressions that are too shallow may not be effective in generating sufficient pressure to circulate blood, which can lead to decreased chances of survival and recovery.

When performing CPR, it's important to ensure the compressions are both deep and at a consistent rate, which contributes to the overall efficacy of the resuscitation effort. The guideline of at least 2 inches reflects medical research that has shown this is an optimal depth for creating the necessary blood flow.

Other options suggest depths that do not meet this minimum standard, hence they are not aligned with the recommended practices for effective CPR.