You respond to the scene of an “injured child.” When you arr…

You respond to the scene of an “injured child.” When you arrive, you find a 4-year-old male lying next to a ladder that is leaning against his house. He is semiconscious but has no external signs of trauma. As you are maintaining stabilization of his head, he begins to vomit. On the basis of this child’s age, clinical presentation, and mechanism of injury, you should be most suspicious for: