When using an AED, what is the first action a rescuer should take?

The first action a rescuer should take when using an AED is to power on the device. This is crucial because turning on the AED allows it to perform its self-checking functions and prepare to provide audio and visual prompts that guide the rescuer during the emergency response. Once the AED is powered on, it assists the rescuer in determining the next steps, including pad placement and whether a shock is advised. This initial step ensures that the AED is ready for use, ultimately optimizing the chances of effectively defibrillating a patient in cardiac arrest.

Other actions like attaching the pads, checking for breathing, or starting CPR are important in the chain of survival, but they are carried out after the AED is powered on. Performing these steps without first activating the AED may delay critical lifesaving interventions.