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Fractional exhaled nitric oxide exchange parameters among 9‐year‐old inner‐city children
Author(s) -
Rosa Maria José,
Divjan Adnan,
Hoepner Lori,
Sheares Beverley J.,
Diaz Diurka,
GauveyKern Kevin,
Perera Frederica P.,
Miller Rachel L.,
Perzanowski Matthew S.
Publication year - 2011
Publication title -
pediatric pulmonology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.866
H-Index - 106
eISSN - 1099-0496
pISSN - 8755-6863
DOI - 10.1002/ppul.21328
Subject(s) - wheeze , medicine , exhaled nitric oxide , exhalation , asthma , cohort , confounding , quartile , population , pediatrics , cohort study , demography , anesthesia , confidence interval , spirometry , environmental health , sociology
Objectives and Hypothesis To determine the feasibility of using a multiple flow offline fractional exhaled nitric oxide (FeNO) collection method in an inner‐city cohort and determine this population's alveolar and conducting airway contributions of NO. We hypothesized that the flow independent NO parameters would be associated differentially with wheeze and seroatopy. Methods As part of a birth cohort study, 9‐year‐old children (n = 102) of African‐American and Dominican mothers living in low‐income NYC neighborhoods had FeNO samples collected offline at constant flow rates of 50, 83, and 100 ml/sec. Seroatopy was defined as having measurable (≥0.35 IU/ml) specific IgE to any of the five inhalant indoor allergens tested. Current wheeze (last 12 months) was assessed by ISAAC questionnaire. Bronchial NO flux (J NO ) and alveolar NO concentration (C alv ) were estimated by the Pietropaoli and Hogman methods. Results Valid exhalation flow rates were achieved in 96% of the children. Children with seroatopy (53%) had significantly higher median J NO (522 pl/sec vs. 161 pl/sec, P < 0.001) when compared to non‐seroatopic children; however, median C alv was not significantly different between these two groups (5.5 vs. 5.8, P = 0.644). Children with wheeze in the past year (21.6%) had significantly higher median C alv (8.4 ppb vs. 4.9 ppb, P < 0.001), but not J NO (295 pl/sec vs. 165 pl/sec, P = 0.241) when compared with children without wheeze. These associations remained stable after adjustment for known confounders/covariates. Conclusions The multiple flow method was easily implemented in this pediatric inner‐city cohort. In this study population, alveolar concentration of NO may be a better indicator of current wheeze than single flow FeNO. Pediatr Pulmonol. 2011; 46:83–91. © 2010 Wiley‐Liss, Inc.