Prenatal Exposure to PM2.5 Oxidative Potential and Lung Function in Infants and Preschool- Age Children: A Prospective Study.

BACKGROUND: Fine particulate matter (PM2.5) has been found to be detrimental to respiratory health of children, but few studies have examined the effects of prenatal PM2.5 oxidative potential (OP) on lung function in infants and preschool children. OBJECTIVES: We estimated the associations of personal exposure to PM2.5  and OP during pregnancy on offspring objective lung function parameters and compared the strengths of associations between both exposure metrics. METHODS: We used data from 356 mother–child pairs from the SEPAGES cohort. PM filters collected twice during a week were analyzed for OP, using the dithiothreitol (DTT) and the ascorbic acid (AA) assays, quantifying the exposure of each pregnant woman. Lung function was assessed with tidal breathing analysis (TBFVL) and nitrogen multiple-breath washout (N2MBW) test, performed at 6 wk, and airwave oscillometry (AOS) performed at 3 y. Associations of prenatal PM2.5  mass and OP with lung function parameters were estimated using multiple linear regressions. RESULTS: In neonates, an interquartile (IQR) increase in OPDTTv (0.89nmol/min/m³) was associated with a decrease in functional residual capacity (FRC) measured by N2MBW  [β = -2.26 mL ; 95% confidence interval (CI): -4.68, 0.15]. Associations with PM2.5  showed similar patterns in comparison with OPDTTv  but of smaller magnitude. Lung clearance index (LCI) and TBFVL parameters did not show any clear association with the exposures considered. At 3 y, increased frequency-dependent resistance of the lungs (Rrs7-19) from AOS tended to be associated with higher OPDTTv  (β = 0.09hPa×s/L ; 95% CI: -0.06, 0.24) and OPAAv  (IQR = 1.14nmol/min/m³ ; β = 0.12hPa×s/L ; 95% CI: -0.04, 0.27) but not with PM2.5  (IQR = 6.9µg/m³ ; β = 0.02hPa×s/L ; 95% CI: -0.13, 0.16). Results for FRC and Rrs7-19 remained similar in OP models adjusted on PM2.5. DISCUSSION: Prenatal exposure to OPDTTv was associated with several offspring lung function parameters over time, all related to lung volumes. [ABSTRACT FROM AUTHOR]

Copyright of Environmental Health Perspectives is the property of National Institute of Environmental Health Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)