Final answer:
Endotracheal intubation is the safest procedure to use in special circumstances, such as when a patient is under general anesthesia. It provides reliable airway access and ensures that the patient can breathe while unconscious.
Step-by-step explanation:
Endotracheal intubation provides the most reliable airway access in special circumstances, such as when a patient is under general anesthesia. During anesthesia, the muscles necessary for breathing can relax, including the tongue, which can partially or fully block the airway. By placing a tube into the trachea, doctors can maintain an open airway to the lungs and prevent complications. This procedure is commonly used in surgeries and allows the patient to breathe while unconscious.