1. There was no significant difference in length of hospital stay or outcomes between children treated with racemic adrenalin and those treated with saline.
2. Regardless of the drug used, on-demand inhalation treatment resulted in shorter length of stay, less oxygen therapy, and fewer overall treatments.
Evidence Rating Level: 1 (Excellent)
Study Rundown: Bronchiolitis is a common pulmonary malady of infants most often caused by respiratory syncitial virus. Administering inhaled racemic adrenaline (RA) has become the standard of care of many providers. However, there is no guiding evidence addressing the frequency of delivery (on-demand versus scheduled) of the treatment. This study showed that regardless of the drug (RA or saline), on-demand inhalation treatment resulted in more favorable outcomes. The study included an interesting subgroup analysis showing that hospital stay was longer in younger than in older infants in the group receiving RA. This finding is contrary to those of prior studies that suggested RA is beneficial for bronchiolitis. Only one hospital in the study collected swabs for identification of the causative virus. It would be interesting to see the data stratified by virus type to determine if there was any virus-dependent treatment variation.
Relevant Reading: Pharmacologic Treatment of Bronchiolitis in infants
In-Depth [double blind randomized controlled trial]: This trial investigated the difference in clinical outcome between two drugs (inhaled racemic adrenaline (RA) and inhaled saline) and two frequencies of delivery (on demand or fixed schedule). A total of 321 children with signs of bronchiolitis completed the study and were randomized into four arms: RA on demand, RA fixed schedule, saline on demand, and saline fixed schedule. The primary outcome was length of hospital stay, while secondary outcomes included clinical change 30 minutes after first inhalation, use of oxygen and ventilatory support. There was no significant difference in length of hospital stay between children treated with RA and those with saline, nor were there differences in secondary outcomes. However, length of hospital stay was significantly shorter for children treated with on demand therapy, regardless of the drug (P=0.01).
By Akira Shishido, MD, and Mitalee Patil
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