A 53-year-old woman collapses while gardening. She is unresponsive, is not breathing, and does not have a pulse. What is the first step in using an AED?

The first step in using an AED (Automated External Defibrillator) is to turn it on. This is crucial because activating the AED allows it to begin its self-checks and audibly instruct the rescuer on what to do next, ensuring that CPR protocols are followed correctly.

After the AED is powered on, it will provide prompts, including how to place the pads on the patient's chest. While it may be helpful to clear the area around the person for safety, this is typically done after turning on the AED, as the device needs to be operational to guide the rescuer effectively. Therefore, turning the AED on is the initial action that sets the response in motion and maximizes the chance of survival for the victim.