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- Sonnenschein-van der Voort, Agnes M. M, et al.
(författare)
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Preterm birth, infant weight gain, and childhood asthma risk: A meta-analysis of 147,000 European children
- 2014
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Ingår i: Journal of Allergy and Clinical Immunology. - : Elsevier. - 0091-6749 .- 1097-6825. ; 133:5, s. 1317-1329
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Tidskriftsartikel (refereegranskat)abstract
- Background: Preterm birth, low birth weight, and infant catch-up growth seem associated with an increased risk of respiratory diseases in later life, but individual studies showed conflicting results. Objectives: We performed an individual participant data meta-analysis for 147,252 children of 31 birth cohort studies to determine the associations of birth and infant growth characteristics with the risks of preschool wheezing (1-4 years) and school-age asthma (5-10 years). Methods: First, we performed an adjusted 1-stage random-effect meta-analysis to assess the combined associations of gestational age, birth weight, and infant weight gain with childhood asthma. Second, we performed an adjusted 2-stage random-effect meta-analysis to assess the associations of preterm birth (gestational age less than 37 weeks) and low birth weight (less than 2500 g) with childhood asthma outcomes. Results: Younger gestational age at birth and higher infant weight gain were independently associated with higher risks of preschool wheezing and school-age asthma (P less than. 05). The inverse associations of birth weight with childhood asthma were explained by gestational age at birth. Compared with term-born children with normal infant weight gain, we observed the highest risks of school-age asthma in children born preterm with high infant weight gain (odds ratio [OR], 4.47; 95% CI, 2.58-7.76). Preterm birth was positively associated with an increased risk of preschool wheezing (pooled odds ratio [pOR], 1.34; 95% CI, 1.25-1.43) and school-age asthma (pOR, 1.40; 95% CI, 1.18-1.67) independent of birth weight. Weaker effect estimates were observed for the associations of low birth weight adjusted for gestational age at birth with preschool wheezing (pOR, 1.10; 95% CI, 1.00-1.21) and school-age asthma (pOR, 1.13; 95% CI, 1.01-1.27). Conclusion: Younger gestational age at birth and higher infant weight gain were associated with childhood asthma outcomes. The associations of lower birth weight with childhood asthma were largely explained by gestational age at birth.
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| 2. |
- Bolger, Claire, et al.
(författare)
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Hyperpnea-Induced Bronchoconstriction and Urinary CC16 Levels in Athletes
- 2011
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Ingår i: Medicine & Science in Sports & Exercise. - 1530-0315. ; 43:7, s. 1207-1213
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Tidskriftsartikel (refereegranskat)abstract
- BOLGER, C., E. TUFVESSON, M. SUE-CHU, G. DEVEREUX, J. G. AYRES, L. BJERMER, and P. KIPPELEN. Hyperpnea-Induced Bronchoconstriction and Urinary CC16 Levels in Athletes. Med. Sci. Sports Exerc., Vol. 43, No. 7, pp. 1207-1213, 2011. Purpose: Exercise-induced bronchoconstriction (EIB) is a common condition in both individuals with asthma and otherwise healthy elite athletes. Although excessive water loss by peripheral airways during hyperpnea is regarded as the initial trigger for EIB, the cascade of events that follows remains unclear. Our goal was to establish whether transient disruption of the airway epithelial barrier occurs after a short period of hyperpnea of dry air in athletes with EIB. Methods: Urinary concentration of the pneumoprotein Clara cell (CC16) was used as an assumed biomarker of lung epithelial cell damage or dysfunction. Samples were collected at baseline and for 90 min after an 8-min eucapnic voluntary hyperpnea (EVH) test in 50 female individuals (28 athletes and 22 untrained). Results: Nineteen subjects (10 athletes) demonstrated a sustained bronchoconstriction after EVH (mean +/- SE forced expiratory volume in the first second (FEV1) fall from baseline = 23.4% +/- 2.6%). The remaining subjects had a negative challenge result with an FEV1 fall of 5.9% +/- 0.6%. An increase (P < 0.001) in urinary CC16 concentration was noticed after EVH in all but one subject, with no group difference (median CC16 increase before to after challenge: athletes EVH- 0.083 ng.mu mol(-1), athletes EVH+ 0.223 ng.mu mol(-1), untrained EVH- 0.074 ng.mu mol(-1), untrained EVH+ 0.571 ng.mu mol(-1); P > 0.05). Conclusions: Urinary levels of CC16 are increased after EVH in all individuals (trained and untrained, with and without EIB) suggestive of dehydration-induced perturbation of the distal respiratory epithelium during episodes of hyperventilation.
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