Final answer:
To ensure an open airway, position the patient with a slightly tilted back head and a lifted chin to prevent the tongue from blocking the airway.
Step-by-step explanation:
To ensure an open airway, the patient should be positioned in a way that allows for the proper alignment of the head, neck, and throat. The head should be tilted back slightly, and the chin lifted up to open the airway. This position helps to prevent the tongue from blocking the airway and allows for easier breathing. It is important to avoid any compression or obstruction of the airway during the positioning.