What is the first action you should take when confirming the absence of breathing and pulse in a patient receiving compression-only CPR?

The first action in this scenario should be to apply the AED and allow it to analyze the rhythm, following its prompts. This action is essential because the AED (Automated External Defibrillator) is designed to assess a patient's heart rhythm and determine if a shock is advised. When a patient is found to be unresponsive and lacking both breathing and a pulse, rapid defibrillation is critical.

By using the AED as soon as possible, you can provide the necessary intervention for a potentially life-threatening condition such as cardiac arrest. The device guides the rescuer through the process, which is vital in emergency situations where time is of the essence.

In the context of CPR, while high-quality chest compressions are important, defibrillation can significantly improve the chances of survival in cases of certain arrhythmias. Therefore, the priority is to use the AED, making it the appropriate first step when the absence of breathing and pulse has been confirmed.