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Poirier, Anne, Amélie Basso, Sarah Bonnet-Ducrot, Ellen Katranji, Sophia Cherif-Alami, Sophie Chateigner-Coelsch, Manon Navarre, Cécile Ricard, and Corentin Tanné. Clinical effect of descent in infants with bronchiolitis diagnosed at altitude: a prospective multicenter study. 26:134-139, 2025. This study aims to assess the clinical impact of descending to a lower altitude in infants with bronchiolitis diagnosed at an altitude above 1,000 m. We performed a prospective, observational, multicenter study during two consecutive winters (2022-2023 and 2023-2024). The diagnosis was made by local general practitioners (GPs) who then sent the patients who were younger than 1 year and had a Wang respiratory score (WRS) ≥4 to any of the five emergency departments (EDs) located at lower altitudes. The WRS, peripheral oxygen saturation (SpO), and respiratory rate (RR) recorded by the GPs and at the EDs were compared. We included 74 infants (59% females, median age 5.4 [3.6-8.0] months). Compared with the median values recorded by the GPs at altitudes above 1,000 m, the median values at the lower-altitude EDs were significantly better for the WRS (5.0 vs. 6.0, = 0.002), RR (50/min vs. 60/min, = 0.001), and SpO (97.0% vs. 91.5%, < 0.001). Descending to a lower altitude significantly improved respiratory function in infants younger than 1 year with bronchiolitis diagnosed at altitudes above 1,000 m.
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