Final answer:
Do not perform the head-tilt/chin-lift or jaw-thrust maneuvers on patients with suspected spinal injury; use endotracheal intubation to maintain an open airway under general anesthesia.
Step-by-step explanation:
You should not perform the head-tilt/chin-lift or jaw-thrust maneuvers on patients with suspected spinal injury. These maneuvers are intended to open the airway in an unconscious patient, but they can be dangerous if a spinal injury is present because they may exacerbate the injury. Instead, when dealing with a patient under general anesthesia, endotracheal intubation is used to maintain an open airway and prevent complications that may arise from relaxed muscles that are important for breathing and keeping the airway unobstructed.