What is the first step Joanne should take when she returns with the AED?

The first step Joanne should take when she returns with the AED is to turn on the AED and follow the prompts. This is crucial because AED devices are designed with built-in audio and visual prompts that guide the rescuer through the necessary steps to provide effective treatment. Turning on the AED engages these instructions, ensuring that the rescuer can properly assess the patient's condition and follow the recommended procedures for attaching pads, analyzing heart rhythms, and administering shocks if needed.

By activating the device first, Joanne ensures that she is utilizing the AED correctly and efficiently in a time-sensitive emergency. Following the prompts also helps to coordinate the efforts of other bystanders, if present, ensuring that everyone is on the same page regarding the resuscitation efforts. This sequential approach enhances the chances of a successful outcome for the patient.