Measurement of bronchial and alveolar nitric oxide production in normal children and children with asthma

American Journal of Respiratory and Critical Care Medicine
Emmanouil ParaskakisAndrew Bush

Abstract

Airway inflammation is characteristic of asthma. Distal inflammation may be particularly important. To calculate alveolar nitric oxide (NO) concentration (C(alv)) and bronchial flux NO (J(NO)) in children. We measured C(alv) and J(NO) from the fractional exhaled NO (FeNO(50)) measured at multiple exhalation flow rates in 132 children (aged 4-18 yr) with known atopic status, medication, and asthma control. Of participants, 85% (112/132) completed all measurements. In 20 of 112, the result did not fit the linear model. Thus, J(NO) and C(alv) were assessed in 92 (70%) subjects. The median (range) values of asthmatic (n = 52), normal (n = 20), and nonasthmatic atopic (n = 20) children were as follows: FeNO(50): 28.1 (4.3-190), 10.35 (3.3-29), 21.8 (8.7-69) ppb, respectively; J(NO): 1,230 (204-9,236), 480 (196-1,913), 1,225 (486-4,119) pl/s, respectively; C(alv): 2.22 (0.44-6.63), 1.63 (0.44-3), 1.21 (0.03-2.85) ppb, respectively. A reproducibility study in 18 other children gave intraclass correlation coefficients (single measures) of 0.99 (J(NO)) and 0.81 (C(alv)). J(NO) and C(alv) were higher in children with asthma than normal children (p = 0.0004 and p = 0.0002, respectively). Children with poorly controlled asthma (n = 27) had...Continue Reading

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