Review Question - QID 216517

A 4-year-old boy presents to the emergency department with a cough. His mother describes him as having a hoarse, deep-sounding cough that has worsened over the past 12 hours. He now appears to be struggling to breathe and his voice is very hoarse and hard to understand. The patient is otherwise healthy and does not take any medications at baseline. His temperature is 99.3°F (37.4°C), blood pressure is 92/58 mmHg, pulse is 107/min, respirations are 29/min, and oxygen saturation is 92% on room air. A hoarse cough is noted on physical exam. Inspiratory stridor is noted at rest. The patient is administered a dose of dexamethasone as well as IV fluids. Which of the following is the most appropriate next step in management?