Lower Respiratory Tract Infection (LRTI) such bronciolitis is the most common cause of infant hospitalization regarding 
almost 60% infant disease hospitalization. Most medical therapies that are given to children with bronchiolitis, specifically bronchodilators and corticosteroids, have limited to no evidence supporting their effectiveness or demonstrate only preliminary effectiveness in specific patient populations according to an article of AAP Journal on this month publication.
However, many recomendations suggested that children with asthma exacerbations should be treated with bronchodilators and corticosteroids. Thus, accordingly, there is no standardized method for clinicians to decide in the acute setting which children who are younger than 2 years and have lower respiratory tract symptoms should be given the diagnostic label of bronchiolitis or reactive airways disease (RAD).
Then some researchers conducted prospective cohort study of patients who were younger than 2 years, who received a final attending physician diagnosis of bronchiolitis in order to identify patterns of specific diagnoses and treatments with lower respiratory tract infection in US academic emergency departments.
Jonathan M. Mansbach, MD from Department of Medicine, Children’s Hospital Boston, Harvard Medical School, Boston, Massachusetts and his colleagues collected on all children who were aged <2 years and had lower respiratory tract infection symptoms during a similar 2- to 3-week winter period at 4 pairs of emergency departments from the same state or region. They diagnosed by using relevant International Classification of Diseases, Ninth Revision, Clinical Modification codes in the primary diagnosis field.
Find full report about Variability in The Management of Bronchiolitis here in 301 Kb Pdf filetype available (source: pediatrics.aappublications.org). See also another Pediatrics Journal you may look for.
