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Imaging fat layer around heart can help predict disease
Date:3/15/2010

Imaging epicardial adipose tissue, or the layer of fat around the heart, can provide extra information compared with standard diagnostic techniques such as coronary artery calcium scoring, according to research by cardiologists at Emory University School of Medicine. The size of the layer of fat around the heart can be measured by X-ray imaging techniques such as CT or MRI.

"This information may be used as a 'gate keeper', in that it could help a cardiologist decide whether a patient should go on to have a nuclear stress test," says Paolo Raggi, MD, professor of medicine (cardiology) and radiology and director of Emory's cardiac imaging center.

Results from two studies were presented at the American College of Cardiology meeting in Atlanta on Sunday, March 14.

The first study, presented by cardiology fellow Nikolaos Alexopoulos, MD, now at the University of Athens, Greece, shows that patients with a larger volume of epicardial adipose tissue tend to have the types of atherosclerotic plaques cardiologists deem most dangerous: non-calcified plaques.

Calcium tends to build up in atherosclerotic plaques. Even though the heart's overall coronary calcium burden is a good predictor of heart disease, calcium in an individual plaque doesn't necessarily mean imminent trouble, Raggi says. Researchers have been learning that non-calcified plaques indicate active buildup in that coronary artery, and studies suggest that the fat around the heart secretes more inflammatory hormones, compared to the fat just under the skin.

"Release of inflammatory factors from epicardial adipose tissue may be promoting an active atherosclerotic process, and this is indicated by the presence of non-calcified plaques," Raggi says.

Emory researchers examined 214 patients through cardiac CT, and performed coronary artery scoring as well as assessing the patients' epicardial adipose tissue volume and the plaque in their coronary arteries. The
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Contact: Jennifer Johnson
jrjohn9@emory.edu
404-227-3683
Emory University
Source:Eurekalert

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