You are called to a scene where a 45-year-old male has been involved in a severe motor vehicle accident. On arrival, you find the patient semi-conscious with an obvious head injury and minimal respiratory effort. Which of the following is the most appropriate initial airway management step for this patient?
Administer oxygen via a non-rebreather mask
Perform a cricothyrotomy
Insert an oropharyngeal airway and monitor
Perform endotracheal intubation