Abstract:
BACKGROUND:Although patients with heart failure (HF) have been identified as particularly susceptible to the acute effects of air pollution, the effects of long-term exposure to air pollution on patients with this increasingly prevalent disease are largely unknown. OBJECTIVE:This study was designed to examine the mortality risk associated with residential exposure to traffic-related air pollution among HF patients. METHODS:A total of 1,389 patients hospitalized with acute HF in greater Worcester, Massachusetts, during 2000 were followed for survival through December 2005. We used daily traffic within 100 and 300 m of residence as well as the distance from residence to major roadways and to bus routes as proxies for residential exposure to traffic-related air pollution. We assessed mortality risks for each exposure variable using Cox proportional hazards models adjusted for prognostic factors. RESULTS:After the 5-year follow-up, only 334 (24%) subjects were still alive. An interquartile range increase in daily traffic within 100 m of home was associated with a mortality hazard ratio (HR) of 1.15 [95% confidence interval (CI), 1.05-1.25], whereas for traffic within 300 m this association was 1.09 (95% CI, 1.01-1.19). The mortality risk decreased with increasing distance to bus routes (HR = 0.88; 95% CI, 0.81-0.96) and was larger for those living within 100 m of a major roadway or 50 m of a bus route (HR = 1.30; 95% CI, 1.13-1.49). Adjustment for area-based income and educational level slightly attenuated these associations. CONCLUSIONS:Residential exposure to traffic-related air pollution increases the mortality risk after hospitalization with acute HF. Reducing exposure to traffic-related emissions may improve the long-term prognosis of HF patients.
journal_name
Environ Health Perspectjournal_title
Environmental health perspectivesauthors
Medina-Ramón M,Goldberg R,Melly S,Mittleman MA,Schwartz Jdoi
10.1289/ehp.10918subject
Has Abstractpub_date
2008-04-01 00:00:00pages
481-5issue
4eissn
0091-6765issn
1552-9924journal_volume
116pub_type
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