Which therapy is typically reserved for moderate to severe croup rather than mild?

• A. Humidified air.
• B. Dexamethasone single dose.
• C. Supportive care.
• D. Nebulized epinephrine.

Answer: (D)

Nebulized epinephrine is used in moderate to severe croup because it delivers rapid, short-term relief by constricting the swollen mucosa in the upper airway, which quickly reduces subglottic edema and improves stridor and breathing. This quick action is crucial when there is significant distress, but its effect wears off within a couple of hours, so it is followed by systemic steroids (like dexamethasone) to provide longer-lasting anti-inflammatory relief and to prevent rebound swelling. In mild croup, such rapid decongestion isn’t typically needed; management focuses on comfort, hydration, and simpler measures, with dexamethasone given to reduce inflammation even in mild cases. Humidified air hasn’t shown consistent benefit in modern practice, so it’s not the go-to treatment for preventing progression.