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Ambient air pollution and risk for ischemic stroke and transient ischemic attack
Lynda D Lisabeth1, James D Escobar, J Timothy Dvonch
1Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor, MI 48109-2029, USA. llisabet@umich.edu
Annals of Neurology
|May 30, 2008
Summary
Short-term exposure to fine particulate matter (PM2.5) and ozone (O3) was linked to increased ischemic stroke and transient ischemic attack (TIA) risk in a US community. These findings highlight the impact of air pollution on cerebrovascular events.
Area of Science:
- Environmental Health
- Neurology
- Epidemiology
Background:
- Limited data exist on the association between air pollution and cerebrovascular disease in the United States.
- Ambient air pollution is a growing public health concern with potential links to various health outcomes.
Purpose of the Study:
- To investigate the association between short-term exposure to ambient air pollution and the risk of ischemic cerebrovascular events.
- To examine the specific roles of fine particulate matter (PM2.5) and ozone (O3) in stroke and transient ischemic attack (TIA) risk within a US community.
Main Methods:
- Utilized daily ischemic stroke/TIA counts from the Brain Attack Surveillance in Corpus Christi (BASIC) Project (2001-2005).
- Acquired daily data on PM2.5, O3, and meteorological conditions.
- Employed Poisson regression models, adjusting for temperature, day of week, and temporal trends, to assess the association between PM2.5/O3 exposure and stroke/TIA risk, including lagged effects.
Main Results:
- Median PM2.5 levels were 7.0 µg/m³.
- Borderline significant associations were observed between same-day and previous-day PM2.5 exposure and increased stroke/TIA risk.
- Ozone (O3) exposure also showed similar associations with stroke/TIA risk, independent of PM2.5.
Conclusions:
- Recent exposure to PM2.5 and O3 is associated with an increased risk of ischemic stroke and TIA, even in areas with relatively low pollution levels.
- This study contributes valuable data on environmental exposures and stroke risk in the US.
- Further research into the effects of ambient air pollution on stroke incidence is warranted.
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