A 9-year-old child has suddenly collapsed. After confirming that the scene is safe, a single rescuer
determinesthat the child is in cardiac arrest, shouts for nearby help, and activates the emergency response svstem by using his mobile device. He immediately begins performing high-quality CPR. Two additional rescuers immediately arrive to assist in the resuscitation attempt.
What actions should occur next to support a team-based resuscitation attempt?