Croup is the most common infectious cause of acute airway obstruction in children between 1 and 6 years of age, accounting for 90% of cases of stridor. The majority of cases of croup are caused by parainfluenza and occur during the late fall and winter. Mist has been a mainstay for croup since the 19th century and, even today, many emergency departments (EDs) routinely begin cool mist therapy for patients with croup. Further therapy of croup typically includes nebulized racemic epinephrine and corticosteroids.
