HFNC Versus NCPAP/ NPPV in Infants With Severe Bronchiolitis

Inclusion Criteria: * Clinical diagnosis of bronchiolitis defined as the first viral episode of respiratory distress before 2 years of aging, presenting with rhinitis, tachypnea, cough, wheezing, prolonged expiratory time, crackles and use of accessory muscles, with or without fever, with or without infiltrate on the chest X ray * bronchiolitis severity Wang modified score ≥ 10 Exclusion Criteria: * recurrent wheezing * heart disease * chronic lung disease * neuromuscular disease * primary diagnosis was not bronchiolitis (pneumonia, pertussis) * critically ill infants who had an immediate need of intubation