Final answer:
In a cardiac arrest situation, team-based resuscitation involves one rescuer performing CPR, especially high-quality chest compressions, while another operates the automated external defibrillator (AED) when necessary.
Step-by-step explanation:
When a 9-year-old child suddenly collapses in a hospital, indicating a case of cardiac arrest, the immediate and correct response is crucial for the child's survival. After the nurse begins CPR and activates the emergency response team, additional nurses who arrive should perform team-based resuscitation. One rescuer should continue administering high-quality chest compressions while another prepares and operates the automated external defibrillator (AED). The focus is on high-quality chest compressions with a target depth of at least 5 cm and a rate of 100 compressions per minute. Simultaneously, the AED should be used to analyze the child's heart rhythm and, if necessary, administer shocks to correct any arrhythmias. In summary, the most appropriate action would be for two rescuers to work together with one performing chest compressions and the other managing the AED under a team-based resuscitation model. As the AED is designed to automatically diagnose and treat the patient's heart rhythm, it simplifies the process for the rescuers. If available, the third rescuer can assist by preparing for advanced life support arrival and providing other necessary aid such as managing the airway or retrieving essential equipment.