What action supports two-rescuer CPR during a cardiac arrest?

Alternating the compressor role every two minutes is an effective practice during two-rescuer CPR. This approach helps to prevent fatigue in the rescuers, ensuring that high-quality chest compressions are maintained throughout the resuscitation effort. When rescuers switch roles at regular intervals, it allows each rescuer to perform compressions with optimal depth and rate, maximizing blood circulation to vital organs.

Maintaining the energy and effectiveness of compressions is crucial because high-quality chest compressions are a primary factor in successfully reviving someone in cardiac arrest. This method significantly increases the chances of survival and reduces the risk of fatigue affecting the quality of CPR administered.

Other actions, while important, do not directly support the effectiveness and efficiency of compressions as much as the alternating of roles does. Operating the AED is a vital part of the resuscitation process but does not address the need for continuous, high-quality compressions. Continuous rescue breaths, while important, should be provided only as a complement to compressions rather than as a standalone action in the two-rescuer format. Additionally, using more pressure during compressions can potentially lead to complications or reduced effectiveness if not applied correctly, thus focusing on the alternating roles is the best approach to support overall CPR effectiveness.