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Why is an atheromatous plaque dangerous ?

By Cityz | January 11, 2007

An atheroma initially forms in the inner lining of the artery -
a layer called the tunica intima. Over a period of time, it
grows and begins to encroach upon the lumen or cavity of the
artery. It thus makes the artery narrow.

Since the volume of blood flow across a tube like an artery
depends closely on the cross-sectional area of the tube, this
narrowing causes a decrease in blood flow in the diseased
artery. As a consequence, the part of the body supplied by that
artery gets less blood and oxygen and nutrients than usual.

For example, if a coronary artery is affected, the heart muscle
gets less nourishment, and cannot perform it’s work normally.

On the other hand, if the plaque grows outwards away from the
cavity of the artery, it weakens the wall of the artery by
destroying the muscle layer in it. As a result, the artery wall
cannot withstand the high pressure inside it, and it starts to
dilate and become thin and stretched out – a condition called
“aneurysm”.

This is dangerous because beyond a certain limit, the aneurysm
will rupture due to the high pressure inside it.

Dr. Robb is the Newsdesk Publisher of http://cityz.net/ ,
providing news and information about this and other subjects.
You can read more at: http://health.cityz.net/heart-disease-3.php

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