Kin of people with heart disease have tangled clots

DALLAS, Sept. 24 Close relatives of people with severe heart disease form abnormally dense and tangled-meshed-like blood clots, making them more prone to clogged arteries, according to the first study of its kind, reported in today's rapid access issue of Circulation: Journal of the American Heart Association.

"Healthy male relatives of patients with severe premature coronary artery disease form fibrin clots that contain thicker fiber networks and are less porous than those of healthy subjects," says Robert Arins, Ph.D., a researcher from the Academic Unit of Molecular Vascular Medicine at the University of Leeds in Leeds, U.K.

Blood clots are composed of fibrin, which is an elastic, threadlike protein. Genetic and environmental factors influence the structure and function of the clot. Researchers know that fibrin clots in young heart disease patients are dense fiber networks, but no one had studied whether relatives' blood shared the characteristic.

"If relatives share this same problem, they could also be at risk for premature heart disease," says Arins.

Researchers analyzed blood from 100 healthy male first-degree relatives of patients with severe heart disease and 100 unrelated individuals of similar ages. All were 65-years-old or younger and had no personal history of heart disease. They had similar lifestyle habits, and conventional cardiovascular risk factors.

The fibrin structure, the rate at which the clot forms, and the thickness of the fibers was tested. Scanning electron microscopy, which helps visualize clot structure differences, was performed on selected samples. Under the microscope, the abnormal clots look like tightly tangled hair.

By analyzing these components, the researchers found that the family members had clots that formed quicker and were composed of thicker, dense fibers.

"The clots were also less permeable than the blood clots of the healthy controls. These characteristics make it more

Contact: Carole Bullock
American Heart Association

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