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Urinary and exhaled biomarkers of exercise‐induced bronchoconstriction in atopic asthmatic children
Author(s) -
Barreto Mario,
Capi Matilde,
Lionetto Luana,
Caiazzo Ilaria,
Salerno Gerardo,
Cardelli Patrizia,
Simmaco Maurizio,
Villa Maria Pia
Publication year - 2019
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.24419
Subject(s) - medicine , bronchoconstriction , exhaled nitric oxide , spirometry , eosinophil , asthma , urinary system , gastroenterology , immunology
Abstract Background Exercise‐induced bronchoconstriction (EIB) reflects poor asthma control. Assessing noninvasive biomarkers associated with EIB could help to monitor patients in the pediatric age. Aims To test exhaled and urinary biomarkers for assessing EIB in atopic asthmatic children. Methods In 45 atopic patients (11.1 ± 1.8 years, 25 males) we measured the fractional exhaled nitric oxide (FE NO ), its alveolar (CaNO), and bronchial (J’awNO) components corrected for the trumpet shape of the airways and axial NO diffusion (TMAD), concentrations of urinary adenosine and 8‐hydroxy‐2'‐deoxyguanosine (8‐OxodG), blood eosinophils count, total immunoglobulin E , skin prick tests, and baseline spirometry before a treadmill exercise challenge. Forty healthy control subjects participated solely to baseline measurements. Results Patients yielded higher FE NO and urinary adenosine concentrations than healthy controls. After the challenge, 18 patients (40%) had EIB; these patients had higher levels of CaNO, CaNO TMAD, and urinary adenosine than patients without EIB. Baseline spirometry, FE NO , JawNO, JawNO TMAD, urinary 8‐OxodG, allergy, and blood eosinophil counts were found similar in both groups. In multiple linear regression, the fall in FEV 1 was explained by CaNO TMAD, urinary adenosine and blood eosinophil count, whereas the fall in FEF 25‐75 was explained by CaNO TMAD and blood eosinophil count. Both CaNO TMAD ≥10.5 ppb and urinary adenosine ≥406 nmol/mmol Cr predicted a fall in FEV 1 ≥10%, while only CaNO TMAD ≥10.5 ppb predicted a fall in FEF 25‐75 ≥26%. Conclusion Concentrations of peripheral airway NO are complementary with urinary adenosine for assessing EIB and promising tools of asthma control in pediatric patients with the atopic phenotype.