What action should be taken if a trained bystander arrives during CPR?

When a trained bystander arrives during CPR, it is vital that they take over chest compressions. This is because chest compressions are critically important in maintaining blood circulation to vital organs, particularly the heart and brain, during a cardiac arrest. If the bystander is trained and ready to take over, they can maintain the effectiveness of the CPR being performed.

Assigning a trained bystander to take over compressions allows the rescuer who has been performing CPR to rest briefly, which is especially important if the first responder is fatigued. Continuous chest compressions are essential, as even short interruptions can decrease the chances of survival and increase the risk of brain damage.

While assigning other roles like providing rescue breaths or calling for additional help are important, the most immediate need during CPR is to ensure that strong and uninterrupted chest compressions continue. This action maximizes the chances of restoring a normal heart rhythm and ensuring blood flow is maintained until emergency medical services arrive.