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Heart attack... its symptoms and signs
A heart attack occurs when blood flow to the heart is severely reduced or blocked. The blockage is often the result of the accumulation of fat, cholesterol, and other substances in the arteries of the heart (coronary arteries). These fatty deposits that contain cholesterol are called plaques. The process of plaque buildup is called atherosclerosis.
The plaque can sometimes rupture and form a clot that blocks blood flow. The lack of blood flow causes damage to part of the heart muscle or destroys it completely.