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Investigators evaluated the effects of treatment with 70% helium/30% oxygen compared with 100% oxygen in a randomized trial of 69 infants aged 2 to 12 months with bronchiolitis who presented to a pediatric emergency department (ED) and were predicted to require hospital admission by two validated clinical severity scales (Modified Wood's Clinical Asthma Score and Respiratory Distress Assessment Instrument). Infants received nebulized albuterol, per ED protocol, before randomization, and then received nebulized racemic epinephrine via face mask along with the assigned gas. At 1 hour, infants with scores reflecting persistent symptoms received a second delivery of nebulized epinephrine with the assigned gas. When epinephrine was not being adm…