Smoking linked to higher risk of peripheral artery disease in African-Americans

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African-Americans who smoke appear to be at greater risk for peripheral artery disease, or PAD, new research has found. Additionally, the findings suggest that smoking intensity – how many cigarettes a day and for how many years – also affects the likelihood of getting the disease.

PAD affects 8 to 12 million people in the United States and 202 million worldwide, especially those age 50 and older. It develops when arteries in the legs become clogged with plaque, fatty deposits that limit blood flow to the legs. Clogged arteries in the legs can cause symptoms such as claudication, pain due to too little blood flow, and increased risk for heart attack and stroke.

The impact of cigarette smoking on PAD has been understudied in African-Americans, even though PAD is nearly three times more prevalent in African-Americans than in whites. The current study looked at the relationship between smoking and PAD in participants in the Jackson Heart Study, the largest single site cohort study investigating cardiovascular disease in African-Americans.

The new research, as well as the Jackson Heart Study, are funded by the National Heart, Lung, and Blood Institute (NHLBI), and the National Institute of Minority Health and Health Disparities (NIMHD), both part of the National Institutes of Health. The new findings appear in the January issue of the Journal of the American Heart Association.

“These findings demonstrate that smoking is associated with PAD in a dose-dependent manner,” said lead researcher Donald Clark, III, M.D., an assistant professor of medicine at the University of Mississippi Medical Center, Jackson. “This is particularly important in the African-American community and supports the evaluation of smoking-cessation efforts to reduce the impact of PAD in this population.”

Even though PAD is more prevalent in African-Americans than in whites, prior studies about the disease did not include significant numbers of African-Americans. This limited the researchers’ ability to single out the specific effects of smoking in this population from other risk factors, such as hypertension, diabetes mellitus, and obesity.

For the study, researchers divided the 5,258 participants into smokers, past smokers and never smokers. After taking into account other risk factors, they assessed smoking intensity and found a dose-dependent link between cigarette smoking and PAD. Those smoking more than a pack a day had significantly higher risk than those smoking fewer than 19 cigarettes daily. Similarly, those with a longer history of smoking had an increased likelihood of the disease.

“Current and past smokers had higher odds of peripheral artery disease than never smokers; although the odds were lower among past smokers,” Clark said. “Our findings add to the mountain of evidence of the negative effects of smoking and highlight the importance of smoking cessation, as well as prevention of smoking initiation.”

Clark noted important caveats. Despite strong associations between smoking and PAD, for example, the findings do not establish a causal link; nor can they be generalized to people of African descent from other regions or countries, since the Jackson Heart Study was conducted in a single community of African-Americans.

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Study: Cigarette Smoking and Subclinical Peripheral Arterial Disease in African Americans of the Jackson Heart Study. DOI: 10.1161/JAHA.118.010674

About the National Heart, Lung, and Blood Institute (NHLBI): NHLBI is the global leader in conducting and supporting research in heart, lung, and blood diseases and sleep disorders that advances scientific knowledge, improves public health, and saves lives. For more information, visit http://www.nhlbi.nih.gov.

National Institute on Minority Health and Health Disparities (NIMHD) is one of NIH’s 27 Institutes and Centers. It leads scientific research to improve minority health and eliminate health disparities by conducting and supporting research; planning, reviewing, coordinating, and evaluating all minority health and health disparities research at NIH; promoting and supporting the training of a diverse research workforce; translating and disseminating research information; and fostering collaborations and partnerships. For more information about NIMHD, visit https://www.nimhd.nih.gov.

About the National Institutes of Health (NIH): NIH, the nation’s medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit http://www.nih.gov.

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http://dx.doi.org/10.1161/JAHA.118.010674

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