Today's News / Health

Air pollution raises stroke risks, study finds

Risk rises within hours of exposure

February 20, 2012
/ Print / Reprints /
ShareMore
/ Text Size+

air pollutionsAir pollution, even at levels generally considered safe by federal regulations, increases the risk of stroke by 34 percent, Beth Israel Deaconess Medical Center researchers have found.

Writing in the Feb. 14, 2012 issue of the Archives of Internal Medicine, researchers who studied more than 1,700 stroke patients in the Boston area over a 10-year period found exposure to ambient fine particulate matter, generally from vehicle traffic, was associated with a significantly higher risk of ischemic strokes on days when the EPA’s air quality index for particulate matter was yellow instead of green.

Researchers focused on particles with a diameter of 2.5 millionths of a meter, referred to as PM2.5. These particles come from a variety of sources, including power plants, factories, trucks and automobiles and the burning of wood. They can travel deeply into the lungs and have been associated in other studies with increased numbers of hospital visits for cardiovascular diseases such as heart attacks.

“The link between increased stroke risk and these particulates can be observed within hours of exposure and are most strongly associated with pollution from local or transported traffic emissions,” says Murray A. Mittleman, MD, DrPH, the study’s senior author, a physician in the CardioVascular Institute at Beth Israel Deaconess Medical Center and an Associate Professor of Medicine at Harvard Medical School. “Any proposed changes in regulated pollution levels must consider the impact of lower levels on public health.”

“Considering that almost everyone is exposed to air pollution and is at risk for stroke, that’s actually a pretty large effect,” adds Gregory Wellenius, ScD, the study’s lead author and an Assistant Professor of Community Health at Brown University.

Researchers analyzed the medical records of more than 1,700 patients who went to the hospital for treatment of confirmed strokes between 1999 and 2008. They matched the onset of stroke symptoms in each patient to hourly measurements of particulate air pollution taken at the nearby Harvard School of Public Health’s environmental monitoring station.

The team was able to estimate the hour the stroke symptoms first occurred, rather than relying on the more coarse measure of when patients were admitted to the hospital. They also included only strokes confirmed by attending neurologists, rather than relying on more vague insurance billing codes.

Meanwhile, Harvard’s hourly measurements of pollution within 13 miles of 90 percent of the stroke patients’ homes allowed for close matching in time of exposure and stroke onset.

“We think that this study is novel in that it has high-quality data on both air pollution exposure and stroke diagnosis,” Wellenius says.

The team was able to calculate that the peak risk to patients from pollution exposure occurs 12-14 hours before a stroke. That information may be useful to researchers who want to trace how PM2.5 might be working in the body to increase the likelihood of stroke.

They also found that black carbon and nitrogen dioxide, two pollutants associated with vehicle traffic, were closely linked with stroke risk, suggesting that pollution from cars and trucks may be particularly important.

Stroke is a leading cause of long-term disability and the third leading cause of death in the United States. An estimated 795,000 Americans suffer a new or recurrent stroke every year, resulting in more than 135,000 deaths and 829,000 hospital admissions.

The finding that days of moderate air quality substantially elevate stroke risk compared to days of good air quality suggest that the Environmental Protection Agency may need to strengthen the language it uses to describe the health consequences of moderate air quality, researchers say.

“In partnership with NIEHS, EPA funded this research advancing our understanding of air pollution and health effects,” said Dan Costa, ScD, DABT, Interim National Program Director for Air Climate & Energy Research in U.S. Environmental Protection Agency Office of Research and Development Research.

“In 2009, EPA published an Integrated Science Assessment concluding a causal relationship exists between PM2.5 and cardiovascular impacts, including strokes. Dr. Wellenius and colleagues’ study is the first to show that the onset of stroke can occur with less than a day's exposure to fine PM. Highly relevant research such as this informs the PM2.5 standards and protects human health.”

Researchers estimate reducing PM2.5 pollution by about 20 percent could have prevented 6,100 of the 184,000 stroke hospitalizations in the northeastern United States in 2007.

While researchers acknowledge results need to be replicated in other cities, they note that Boston is considered to have relatively clean air.

“The levels of PM2.5 in Boston are lower than those seen in many in other parts of the country, yet we still find that within these moderate levels the risk of stroke is higher on days with more particles in the air,” Mittleman says.

In addition to Wellenius and Mittleman, co-authors include Mary R. Burger, MD, and Gottfried Schlaug, MD, MPH of BIDMC, Brent A. Coull. PhD, Joel Schwartz, PhD, Helen Suh, ScD, Petros Koutrakis, PhD, of the Harvard School of Public Health and Diane R. Gold, MD, of Brigham an d Women’s Hospital.

The study was supported by National Institute of Environmental Health Sciences and the Environmental Protection Agency. One or more of the authors are currently receiving or have received funding from the Health Effects Institute of Boston; the Electric Power Research Institute of Palo Alto, CA; the EPA and the National Institutes of Health.

Beth Israel Deaconess Medical Center is a major patient care, teaching and research affiliate of Harvard Medical School, currently ranks third in National Institutes of Health funding among independent hospitals nationwide. The medical center is clinically affiliated with the Joslin Diabetes Center and is a founding member of the Dana-Farber/Harvard Cancer Center. BIDMC is the official hospital of the Boston Red Sox. For more information, visit www.bidmc.org.

Did you enjoy this article? Click here to subscribe to ISHN.

You must login or register in order to post a comment.

Multimedia

Videos

Image Galleries

Scenes from the World of Safety

Sights, signs & symbols from the National Safety Congress & Expo held in San Diego, CA, September 15-18

12/11/14 11:00 am EST

Why Flame Resistant Workwear? Understanding Workplace Hazards and OSHA Compliance

By defining the leading causes of flash fires, electric arc and molten metal splatter, we will address the ways in which companies can better protect their employees from such hazards through proper staff outfitting. In the topic, we will discuss the benefits of – and recent developments to – flame-resistant workwear and what to consider when creating a program for your employees.

ISHN Magazine

ISHN1214_cover.jpg

2014 December

Check out ISHN's last issue of the year, which features articles about distance learning, foot protection and confined space.

Table Of Contents Subscribe

THE ISHN STORE

M:\General Shared\__AEC Store Katie Z\AEC Store\Images\ISHN\safetyfourth.jpg
Safety Engineering, 4th Edition

A practical, solutions-driven reference, Safety Engineering, 4th edition, has been completely revised and updated to reflect many of today’s issues in safety.

More Products

For Distributors Only - SEPTEMBER 2014

ISHN FDO SEPTEMBER 2014For Distributors Only is ISHN's niche brand standard-sized magazine supplement aimed at an audience of 2,000 U.S. distributors that sell safety products. Circulation only goes to distributors. CHECK OUT THE SEPTEMBER 2014 ISSUE OF FDO HERE

STAY CONNECTED

Facebook logo Twitter YouTubeLinkedIn Google + icon

ishn infographics

2012 US workplace deathsCheck out ISHN's new Infographic page! Learn more about worker safety through these interactive images. CLICK HERE to view the page.