A December 2007 PubMed search of English-language epidemiologic studies and their citations regarding dioxin exposure and CVD mortality provided the basis for the systemic review. The authors, researchers at the Harvard School of Public Health and the U.S. Environmental Protection Agency, selected studies on original mortality data from all cases of CVD or IHD.
They excluded studies of leather, flavor, and fragrance workers, whose occupational exposures typically include not only dioxin but also cardiotoxic methylmercury, arsenic and xylene. Finally, they grouped the studies by their quality, according to two well-recognized criteria. The studies considered to be of the highest quality found consistent and significant dose-related associations with IHD mortality and more modest associations with all-CVD mortality.
Although a number of epidemiologic studies have examined the association of dioxin exposure with CVD morbidity or mortality, the authors found no published systematic reviews on this topic. This is possibly because dioxin epidemiology research has focused primarily on the association with various cancers.
The authors wrote that future studies in both animals and humans should assess whether cardiovascular effects are present at environmentally relevant doses of dioxin.
EHP editor-in-chief Hugh A. Tilson, PhD, said, “With cardiovascular disease a leading cause of death in many countries, the potential role of dioxin exposure as a preventable risk factor could be of substantial interest.”
Authors include Olivier Humblet, Eric Rimm, Murray A. Mittleman, Russ Hauser, and Linda Birnbaum.
The article is available free of charge at http://www.ehponline.org/members/2008/11579/11579.html.
EHP is published by the National Institute of Environmental Health Sciences (NIEHS), part of the U.S. Department of Health and Human Services. EHP is an Open Access journal. More information is available online at http://www.ehponline.org/. Brogan & Partners Convergence Marketing handles marketing and public relations for the publication, and is responsible for creation and distribution of this press release.
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