Paediatricsmiddle twist
A 2-year-old boy is brought to a regional emergency department at 3 am with two days of runny nose and a harsh barking cough. Forty minutes ago he was given dexamethasone 0.15 mg/kg orally. He now sits upright on his mother's lap, unwilling to lie down, with a continuous harsh noise on breathing in that does not settle when he is quiet, and indrawing above the sternum and between the ribs. He is alert and pink, respiratory rate 48/min, oxygen saturation 96% in air. Which one of the following should be given next?