Friday, March 25th, 2011 7:03 am
Cardiac health: looking for puzzle pieces that fit
By Mary Jane Dittmar, Firelink.com
That there may be a connection between air pollution and sudden cardiac death is not news. What is news, however, is that at least one study has found that “pollution-related cardiac arrests occurred when particulate levels were high but still below the current Environmental Protection Agency (EPA) safety threshold of 35 micrograms per cubic meter of air,” according to a study published in the September 20 online American Journal of Epidemiology. The research was conducted by the North Shore-Long Island Jewish Health System. In a previous column, for example, it was reported that exposure to ultrafine particles during fire suppression should be considered a potential contributing factor for coronary heart disease in firefighters. The study was published in the Journal of Occupational and Environmental Medicine, Aug. 2010.
The North Shore-Long Island Jewish Health System study looked at more than 8,000 people who suffered out-of-hospital cardiac arrests in New York City between 2002 and 2006 in relation to air pollution levels during that time. The number of out-of-hospital cardiac arrests rose four to 10 percent with each 10 microgram per cubic meter of air increase in small-particle air pollution. The eye-opening finding here, as cited above, was that these cardiac arrests occurred when particulate levels were still below the EPA safety threshold. This study adds to the growing body of research that suggests air pollution is bad for the heart. Earlier this year, the American Heart Association issued a statement noting that evidence is growing that air pollution is a risk factor in heart attack, stroke, and cardiovascular death.
The National Institute of Environmental Health Sciences (NIEHS), National Institutes of Health, has funded a number of studies on the association between airborne particles, such as sulfur dioxide and other fossil fuel emissions, and the risk of early death from cardiovascular disease. The studies found a strong relationship. One of these studies was the Six Cities Study, conducted in 1974, at Harvard University. It initiated a long-term study on residents of the cities to assess the effects of common air pollutants on respiratory and cardiovascular health. More than 8,000 subjects were studied over a period of 14 to 16 years. The focus was on the health effects of gaseous pollutants, such as sulfur dioxide (the result of coal burning), and fine particle air pollution (that comes from motor vehicle exhaust and power plant emissions). Subjects living in the more polluted cities were found to have a higher risk of hospitalization and early death from pulmonary and heart diseases as compared with those living in the less polluted cities. Fine particle pollution was proven to have a stronger association with mortality than the gaseous pollutants.








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