Bronchiolitis is a common viral illness. It is most commonly caused by respiratory syncytial virus and typically occurs over the late fall and winter months. Children less than 2 years of age are most commonly affected, with the largest burden of illness being in children less than 12 months of age.



Key studies

Key Study: High-flow warm humidified oxygen versus standard low-flow nasal cannula oxygen for moderate bronchiolitis (HFWHO RCT): An open, phase 4, randomised controlled trial


Kepreotes E, Whitehead B, Attia J, Oldmeadow C, Collison A, Searles A, Goddar...

Objectives: Bronchiolitis is the most common lung infection in infants and treatment focuses on management of respiratory distress and hypoxia. High-flow warm humidified oxygen (HFWHO) is increasingly used, but has not been rigorously studied in randomised trials. This study aimed to examine whether HFWHO provided enhanced respiratory support, thereby shortening time to weaning off oxygen

Key Study: Epinephrine and dexamethasone in children with bronchiolitis


Plint AC, Johnson DW, Patel H, Wiebe N, Correll R, Brant R, Mitton C, Gouin S...

This randomized, double-blind, placebo-controlled, clinical trial with a factorial design at multiple sites was undertaken to determine whether treatment with nebulized epinephrine, a short course of oral dexamethasone, or both resulted in a clinically important decrease in hospital admissions among infants with bronchiolitis who were seen in the emergency department.

Key Study: A multicenter, randomized, controlled trial of dexamethasone for bronchiolitis


Corneli HM, Zorc JJ, Mahajan P, Shaw KN, Holubkov R, Reeves SD, Ruddy RM, Mal...

The goal of this study was to determine the effectiveness of a single dose of oral dexamethasone in infants with moderate-to-severe bronchiolitis.

Key Study: Evaluation of the utility of radiography in acute bronchiolitis


Schuh S, Lalani A, Allen U, Manson D, Babyn P, Stephens D, MacPhee S, Mokansk...

Objectives: to determine the proportion of radiographs inconsistent with bronchiolitis in children with typical presentation of bronchiolitis and to compare rates of intended antibiotic therapy before radiography versus those given antibiotics after radiography.