• J. Allergy Clin. Immunol. · Nov 2016

    Exhaled nitric oxide: Not associated with asthma, symptoms, or spirometry in children with sickle cell anemia.

    • Robyn T Cohen, Mark Rodeghier, Fenella J Kirkham, Carol L Rosen, Jane Kirkby, Michael R DeBaun, and Robert C Strunk.
    • Department of Pediatrics, Boston University School of Medicine, Boston, Mass. Electronic address: robyn.cohen@bmc.org.
    • J. Allergy Clin. Immunol. 2016 Nov 1; 138 (5): 1338-1343.e4.

    BackgroundThe significance of fractional exhaled nitric oxide (Feno) levels in children with sickle cell anemia (SCA) is unclear, but increased levels can be associated with features of asthma and thus increased morbidity.ObjectivesWe sought to determine factors associated with Feno and whether Feno levels are associated with increased rates of acute chest syndrome (ACS) and pain.MethodsAll participants had SCA, were part of the prospective observational Sleep and Asthma Cohort study, and had the following assessments: Feno levels, spirometry, blood samples analyzed for hemoglobin, white blood cell counts, eosinophil counts and total serum IgE levels, questionnaires about child medical and family history, and review of medical records.ResultsThe analytic sample included 131 children with SCA (median age, 11.2 years; age range, 6-18 years) followed for a mean of 16.2 years, including a mean of 5.1 years after baseline Feno data measurements. In multivariable analyses higher Feno levels were associated with ln(IgE) levels (P < .001) and the highest quartile of peripheral eosinophil counts (P = .03) but not wheezing symptoms, baseline spirometric indices, or response to bronchodilator. Multivariable analyses identified that the incident rate of ACS was associated with ln(Feno) levels (P = .03), as well as male sex (P = .025), wheezing causing shortness of breath (P = .002), and ACS at less than 4 years of age (P < .001). Feno levels were not associated with future pain episodes.ConclusionsSteady-state Feno levels were not associated with an asthma diagnosis, wheezing symptoms, lung function measures, or prior sickle cell morbidity but were associated with markers of atopy and increased risk of future ACS events.Copyright © 2016 American Academy of Allergy, Asthma & Immunology. Published by Elsevier Inc. All rights reserved.

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