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  • Pollution Exposure may...

Pollution Exposure may increase Stroke Risk in People with atrial fibrillation

Written By : Dr. Kamal Kant Kohli Published On 2020-09-16T20:30:10+05:30  |  Updated On 17 Sept 2020 2:34 PM IST
Pollution Exposure may increase Stroke Risk in People with atrial fibrillation
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Researchers at the UPMC Heart and Vascular Institute and University of Pittsburgh School of Medicine have found in a new study that people with atrial fibrillation who are exposed to greater levels of pollution have a 1.2-fold higher risk of stroke than their peers who live with less pollution, according to a JAMA Network Open study.

The study is the largest of its kind to include neighborhood-specific pollution data—rather than simply hospitalization data—and further emphasizes the importance of air pollution alerts in advising the activities of people with certain heart conditions.

"We measured pollution exposure at people's doorsteps by using geocoding and then determined their annual exposure to particulate matter. This approach and the sample size make our study particularly powerful," said Jared W. Magnani, M.D., M.Sc., UPMC cardiologist and associate professor of medicine at Pitt. "We can use this information to guide our patients by advising them to limit exposure to pollution. For example, we can notify those with atrial fibrillation to avoid being outside on days with unhealthy air quality, which may reduce their risk of stroke."

Magnani and his colleagues followed more than 31,000 people living in Allegheny County since 2007 with atrial fibrillation (AFib), a common heart rhythm disorder affecting at least 2.7 million Americans. Using suitcase-sized air pollution monitors mounted on telephone poles, the team was able to measure the exact levels of fine particulate pollution—soot—that the participants were breathing on a daily basis. The Pittsburgh region is ranked by the American Lung Association as one of the 10 most polluted in the U.S.

The researchers found that stroke risk steadily increased with higher daily exposure to air pollution. People with AFib already are at five times the risk of stroke, so the additional risk posed by fine particulate pollution is particularly concerning, Magnani noted.

"Our results advance the understanding of how air pollution impacts public health and strengthens the argument for continued advocacy to curb pollution," he said. "Fine particulate pollution is very small—it is able to get into our bodies through our lungs and into our blood stream where it can trigger heart events."

The team went on to examine the impact of pollution on different demographic and socioeconomic groups. They found that fine particulate exposure is 1.5-fold higher in blacks compared to whites, and 1.3-fold higher in those living below poverty versus above.

"Pollution exposure correlates with socioeconomic position, as people living closer to industrial sources tend to be lower income and minoritized. Hence, air pollution worsens racial disparities in health outcomes, due to the increased residential exposure," Magnani said. "Our study indicates the importance of modifying pollution as a risk factor for adverse health outcomes."

Magnani said future research will explore how individual factors—such as physical activity, diet, health care access and medication—might interact with pollution levels to modify stroke risk for people with AFib.

To read this release online or share it, visit https://www.upmc.com/media/news/091620-af-pollution.


PollutionStrokeheart rhythm disorderAtrial fibrillationJAMA network open
Source : JAMA Network Open
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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