After calling 911 for a child in cardiac arrest, what should the rescuer do upon returning?

Using an Automated External Defibrillator (AED) and beginning CPR is the best action after calling 911 for a child in cardiac arrest. An AED is a critical tool that can assess the heart rhythm and, if necessary, deliver an electrical shock to restore a normal heartbeat. In cases of cardiac arrest, initiating CPR immediately is vital, as it helps maintain blood flow to vital organs until professional help arrives.

The combination of using the AED and performing CPR maximizes the child's chances of survival. Immediate CPR keeps the blood circulating, providing oxygen to the brain and other vital organs, while the AED prepares to potentially correct any shockable arrhythmias.

In contrast, other responses like checking for a pulse or waiting for emergency services can delay critical interventions. Each moment without effective cardiovascular support reduces the likelihood of a favorable outcome, making prompt action essential when faced with cardiac arrest situations.