Before using an AED, what is the first step a rescuer should take?

The first step a rescuer should take before using an AED is to turn on the AED. This step is crucial because the AED guides the rescuer through the process with verbal and visual prompts. When the device is powered on, it begins to analyze the patient's heart rhythm and ensures that the rescuer is following the correct protocol to maximize the patient's chance of survival.

Once the AED is on, it will provide instructions on how to proceed, including when to apply the pads and when to administer a shock, if indicated. This systematic approach is designed to ensure the safety of both the rescuer and the patient.

In this context, checking for a heartbeat, starting CPR immediately, or attaching pads to the patient without first activating the AED can lead to confusion and potentially delay the delivery of lifesaving assistance. Activating the AED first ensures that the rescuer is using a tool specifically designed to assess and treat cardiac emergencies expertly.