When giving CPR to an adult, what is the first step?

The correct first step when providing CPR to an adult is to ensure the person is lying flat on their back. This positioning is crucial because it allows for proper access to the chest during chest compressions and facilitates more effective ventilation when rescue breaths are administered. Lying flat also helps prevent any potential obstruction of the airway, which is vital in an emergency situation.

Before starting chest compressions, it's important to confirm that the surface is firm and flat, as a soft or uneven surface could hinder effective compressions. Ensuring the correct position also helps prepare the area for potential rescuers or for emergency medical services to take over once they arrive.

Additionally, while calling for help and checking for a pulse are essential parts of the overall CPR process, they follow the immediate action of positioning the individual properly. Administering rescue breaths is also not the first step, as it comes after establishing an effective rhythm of chest compressions. By beginning with the individual in the correct position, you set the foundation for effective CPR and increase the chances of a positive outcome.