In randomized controlled trials, the use of nebulized hypertonic saline in acute
bronchiolitis has been reported to improve respiratory distress scores, to reduce length of
hospital stay and to show a trend towards lower hospitalization rates.
The investigators aim to verify by an observational study if the rate of hospital admission
and the length of hospital stay of infants presenting to the emergency department (ED) with
bronchiolitis decreases after the inclusion of 5.85% nebulized hypertonic saline in the
treatment strategy of the ED and hospitalization wards.
The investigators will assess the evolution of hospital admission rates and the length of
hospital stay in two hospitals that use 5.85% nebulized hypertonic saline for the treatment
of bronchiolitis and in two hospital that do not use these nebulizations. If nebulized
hypertonic saline is effective in this setting, then the hospitalization rates and length of
stay should be lower during the year of hypertonic saline use compared to two previous years
when this therapy was not used. These parameters would not be modified in centers that do not
use hypertonic saline.