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Atherosclerosis in abdominal aorta may signal future heart attack, stroke
Date:6/17/2013

OAK BROOK, Ill. In a study of more than 2,000 adults, researchers found that two MRI measurements of the abdominal aorta the amount of plaque in the vessel and the thickness of its wall are associated with future cardiovascular events, such as a heart attack or stroke. Results of the study are published online in the journal Radiology.

"This is an important study, because it demonstrates that atherosclerosis in an artery outside the heart is an independent predictor of adverse cardiovascular events," said the study's lead author, Christopher D. Maroules, M.D., a radiology resident at the University of Texas Southwestern Medical Center in Dallas and lead author. "MRI is a promising tool for quantifying atherosclerosis through plaque and arterial wall thickness measurements."

Atherosclerosis is a condition in which fat, cholesterol and other substances collect within the arteries, forming plaque. As plaque accumulates, the artery narrows, limiting blood flow. The condition can occur in any artery, including the cerebral (brain) and coronary (heart) arteries and the aorta, which carries oxygenated blood from the heart through the abdomen to the rest of body. The aorta is the largest artery body.

In the study, researchers analyzed abdominal MR images of 2,122 participants (mean age 44) in the Dallas Heart Study, a multiethnic population-based study of healthy adults from Dallas County, Texas. Two measurements were obtained from the MR images: mean abdominal aortic wall thickness, or the thickness of the vessel wall, and the amount of plaque buildup, referred to as the aortic plaque burden.

Following imaging, study participants were monitored for a period of 7.8 years. During that time, 143 participants experienced an adverse cardiovascular event in which arterial blood flow was obstructed, resulting in death or medical intervention. Researchers categorized the events as related to the heart (cardiac events) or to other
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Contact: Linda Brooks
lbrooks@rsna.org
630-590-7762
Radiological Society of North America
Source:Eurekalert

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