Symptomatic viral infection is associated with impaired response to treatment in children with acute asthma
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Objective: To examine the influence of viral respiratory infection (VRI) on treatment response in acute asthma in children. Study design: A total of 218 children (mean age, 6.6 years) with acute asthma were recruited. Symptoms were recorded, an asthma severity score was determined, and whenever possible, a per-nasal aspirate was obtained for detection of viruses. Each child's response to inhaled ß 2-agonists was assessed after 6, 12, and 24 hours. Results: The 168 children with VRI symptoms received more treatment with inhaled ß 2-agonists after 6 hours (P = .010), 12 hours (P =.002), and 24 hours (P =.0005) compared with the 50 children without such symptoms. Asthma severity did not differ between the 2 groups. A per-nasal aspirate was obtained from 77% of the children. The most frequently identified virus was rhinovirus (61.4%). Among children with symptoms of a VRI, those with rhinovirus had an impaired response to ß 2-agonists at 6 hours (P =.032). Conclusion: Children with acute asthma and symptoms of VRI respond less effectively to ß 2-agonists after 6, 12, or 24 hours and thus may benefit from more intense therapy and monitoring. Copyright © 2012 Mosby Inc. All rights reserved.
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