Liu, L and Poon, R and Chen, L and Frescura, A-M and Montuschi, P and Ciabattoni, G and Wheeler, A and Dales, D, Acute Effects of Air Pollution on Pulmonary Function, Airway Inflammation, and Oxidative Stress in Asthmatic Children, Environmental Health Perspectives, 117, (4) pp. 668-674. ISSN 0091-6765 (2009) [Refereed Article]
OBJECTIVE: In this study we investigated acute effects of air pollution on pulmonary function and airway oxidative stress and inflammation in asthmatic children.
METHODS: We studied 182 children with asthma, 9-14 years of age, for 4 weeks. Daily ambient concentrations of sulfur dioxide, nitrogen dioxide, ozone, and particulate matter < or = 2.5 microm in aerodynamic diameter (PM(2.5)) were monitored from two stations. Once a week we measured spirometry and fractional exhaled nitric oxide (FeNO), and determined thiobarbituric acid reactive substances (TBARS) and 8-isoprostane--two oxidative stress markers--and interleukin-6 (IL-6) in breath condensate. We tested associations using mixed-effects regression models, adjusting for confounding variables.
RESULTS: Interquartile-range increases in 3-day average SO2 (5.4 ppb), NO2 (6.8 ppb), and PM(2.5) (5.4 microg/m3) were associated with decreases in forced expiratory flow between 25% and 75% of forced vital capacity, with changes being -3.1% [95% confidence interval (CI), -5.8 to -0.3], -2.8% (95% CI, -4.8 to -0.8), and -3.0% (95% CI, -4.7 to -1.2), respectively. SO2, NO2, and PM(2.5) were associated with increases in TBARS, with changes being 36.2% (95% CI, 15.7 to 57.2), 21.8% (95% CI, 8.2 to 36.0), and 24.8% (95% CI, 10.8 to 39.4), respectively. Risk estimates appear to be larger in children not taking corticosteroids than in children taking corticosteroids. O3 (5.3 ppb) was not associated with health end points. FeNO, 8-isoprostane, and IL-6 were not associated with air pollutants.
CONCLUSION: Air pollution may increase airway oxidative stress and decrease small airway function of asthmatic children. Inhaled corticosteroids may reduce oxidative stress and improve airway function.
|Item Type:||Refereed Article|
|Keywords:||air quality, respiratory health, children|
|Research Division:||Medical and Health Sciences|
|Research Group:||Public Health and Health Services|
|Research Field:||Environmental and Occupational Health and Safety|
|Objective Group:||Public Health (excl. Specific Population Health)|
|Objective Field:||Environmental Health|
|Author:||Wheeler, A (Dr Amanda Wheeler)|
|Web of Science® Times Cited:||147|
|Deposited By:||Menzies Institute for Medical Research|
|Downloads:||139 View Download Statistics|
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