What is the first step in using an AED?

The first step in using an Automated External Defibrillator (AED) is to open and turn on the device. This is crucial for several reasons. When the AED is activated, it will guide you through the subsequent steps with audible prompts and visual instructions. By opening and turning on the AED first, you ensure that it is ready to analyze the heart rhythm and provide the necessary instructions for pad placement and defibrillation if indicated.

This step, followed by applying the pads to the patient’s bare chest, allows the AED to assess the heart's electrical activity and determine whether a shock is needed. Starting chest compressions before the AED is activated could distract from the critical task of preparing the AED to assist the patient. Similarly, while calling for additional help may be important, it should be done promptly in conjunction with the other steps rather than before activating the AED, which is the immediate priority in a cardiac arrest situation.