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Changes in exhaled nitric oxide levels with immunotherapy

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The mechanisms by which immunotherapy (IT) modulates allergic airway response are not entirely clear. Exhaled nitric oxide (eNO) is a sensitive marker of airway inflammation in allergic respiratory disorders. We hypothesize that eNO may serve as a barometer of the immunomodulatory changes occurring during IT. We aimed to characterize the pattern of eNO levels in children undergoing traditional IT (TradIT) and rush IT (RushIT). Off-line measurements of eNO were obtained in children electing to undergo RushIT or TradIT at a University-based Allergy/Asthma Clinic. The eNO was measured before IT (pre-IT, week 0) was initiated, and at 2, 4, 6, 8, and 12 weeks after starting IT. Nine children received TradIT and 10 children received RushIT. Pre-IT eNO in the RushIT group averaged 12.6 parts per billion (ppb). This was followed by a rise to 17.7 ppb at week 2. The elevated eNO levels persisted till week 8, and then dramatically dropped below the pre-IT values to 8.9 ppb at week 12 (p = 0.038). Similar changes in eNO were not seen in the TradIT group. The difference in eNO levels between the two groups was most marked at 4 weeks (p = 0.014). Initiation of IT produces significant immunomodulatory changes such as a rise in eNO levels. Temporally, the changes appear to be accelerated in the RushIT group compared with the TradIT group, with return to baseline as maintenance IT levels are achieved.
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Document Type: Research Article

Publication date: March 1, 2006

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  • Allergy and Asthma Proceedings is a peer reviewed publication dedicated to distributing timely scientific research regarding advancements in the knowledge and practice of allergy, asthma and immunology. Its primary readership consists of allergists and pulmonologists.

    The goal of the Proceedings is to publish articles with a predominantly clinical focus which directly impact quality of care for patients with allergic disease and asthma and by having the potential to directly impact the quality of patient care. AAP welcomes the submission of original works including peer-reviewed original research and clinical trial results. Additionally, as the official journal of the Eastern Allergy Conference (EAC), AAP will publish content from EAC poster sessions as well as review articles derived from EAC lectures.

    Featured topics include asthma, rhinitis, sinusitis, food allergies, allergic skin diseases, diagnostic techniques, allergens, and treatment modalities. Published material includes peer-reviewed original research, clinical trials and review articles.

    Articles marked "F" offer free full text for personal noncommercial use only.

    The journal is indexed in Thomson Reuters Web of Science and Science Citation Index Expanded, plus the National Library of Medicine's PubMed service.
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