Am J Epidemiol 2003; 157:501-509.
Copyright © 2003 by Johns
Hopkins Bloomberg School of Public Health
ORIGINAL CONTRIBUTIONS |
Exposure to Ambient Fine Particulate Matter and Primary Cardiac Arrest among Persons With and Without Clinically Recognized Heart Disease
1 Department of Environmental Health, School of Public Health, University of Washington, Seattle, WA.
2 Department of Biostatistics, School of Public Health, University of Washington, Seattle, WA.
3 Department of Epidemiology, School of Public Health, University of Washington, Seattle, WA.
4 Department of Medicine, School of Medicine, University of Washington, Seattle, WA.
The authors studied the association between incidence of primary cardiac arrest and daily measures of fine particulate matter (
2.5 µm) using a case-crossover study of 1,206 Washington State out-of-hospital cardiac arrests (1985–1994) among persons with (n = 774) and without (n = 432) clinically recognized heart disease. The authors compared particulate matter levels on the day of the cardiac event and the 2 days preceding the event with levels from matched reference days. The estimated relative risk for a 13.8-µg/m3 increase in fine particulate matter (nephelometry: 0.54 x 10–1 km–1 bsp) on the day prior to cardiac arrest was 0.94 (95% confidence interval: 0.88, 1.02). Pollutant levels measured on the same day as the event and on the 2 days preceding the event demonstrated similar results. No increased risk was found among all cases with preexisting cardiac disease (odds ratio = 0.97, 95% confidence interval: 0.89, 1.07); however, an unexpected association appeared between current smokers with preexisting heart disease and increased particulate matter levels 2 days prior to the event (odds ratio = 1.29, 95% confidence interval: 1.06, 1.55). This association was not present in the 0- or 1-day lag analyses or in persons with other diseases. There was no consistent association between increased levels of fine particulate matter and risk of primary cardiac arrest.
air pollutants; air pollution; heart arrest; heart diseases; environmental exposure
Abbreviations:
Abbreviations: CI, confidence interval; PM1.0, particulate matter 1.0 µm in aerodynamic diameter; PM2.5, particulate matter 2.5 µm in aerodynamic diameter; PM10, particulate matter 10 µm in aerodynamic diameter.
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