Document Detail


Influence of ambient air pollutant sources on clinical encounters for infant bronchiolitis.
MedLine Citation:
PMID:  19713450     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
RATIONALE: Data regarding the influence of ambient air pollution on infant bronchiolitis are few. OBJECTIVES: We evaluated the impact of several air pollutants and their sources on infant bronchiolitis. METHODS: Infants in the Georgia Air Basin of British Columbia with an inpatient or outpatient clinical encounter for bronchiolitis (n = 11,675) were matched on day of birth to as many as 10 control subjects. Exposure to particulate matter with a diameter of 2.5 mum or less (PM(2.5)), PM(10), NO(2)/NO, SO(2), CO, and O(3) were assessed on the basis of a regional monitoring network. Traffic exposure was assessed using regionally developed land use regression (LUR) models of NO(2), NO, PM(2.5), and black carbon as well as proximity to highways. Exposure to wood smoke and industrial emissions was also evaluated. Risk estimates were derived using conditional logistic regression and adjusted for infant sex and First Nations (Canadian government term for recognized aboriginal groups) status and for maternal education, age, income-level, parity, smoking during pregnancy, and initiation of breastfeeding. MEASUREMENTS AND MAIN RESULTS: An interquartile increase in lifetime exposure to NO(2), NO, SO(2), CO, wood-smoke exposure days, and point source emissions score was associated with increased risk of bronchiolitis (e.g., adjusted odds ratio [OR(adj)] NO(2), 95% confidence interval [CI], 1.12, 1.09-1.16; OR(adj) wood smoke, 95% CI, 1.08, 1.04-1.11). Infants who lived within 50 meters of a major highway had a 6% higher risk (1.06, 0.97-1.17). No adverse effect of increased exposure to PM(10), PM(2.5), or black carbon, was observed. Ozone exposure was negatively correlated with the other pollutants and negatively associated with the risk of bronchiolitis. CONCLUSIONS: Air pollutants from several sources may increase infant bronchiolitis requiring clinical care. Traffic, local point source emissions, and wood smoke may contribute to this disease.
Authors:
Catherine J Karr; Paul A Demers; Mieke W Koehoorn; Cornel C Lencar; Lillian Tamburic; Michael Brauer
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-08-27
Journal Detail:
Title:  American journal of respiratory and critical care medicine     Volume:  180     ISSN:  1535-4970     ISO Abbreviation:  Am. J. Respir. Crit. Care Med.     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-11-09     Completed Date:  2009-11-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9421642     Medline TA:  Am J Respir Crit Care Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  995-1001     Citation Subset:  AIM; IM    
Affiliation:
Department of Pediatrics, University of Washington, 401 Broadway, Box 359739, Seattle, WA 98104, USA. ckarr@u.washington.edu
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MeSH Terms
Descriptor/Qualifier:
Acute Disease
Air Pollutants / toxicity*
British Columbia
Bronchiolitis / chemically induced*
Female
Humans
Industrial Waste / adverse effects
Infant
Male
Particulate Matter / toxicity
Smoke / adverse effects
Vehicle Emissions / toxicity
Wood
Chemical
Reg. No./Substance:
0/Air Pollutants; 0/Industrial Waste; 0/Particulate Matter; 0/Smoke; 0/Vehicle Emissions

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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