Heart Attack Causes
Most heart attacks are the end result of coronary heart disease, an condition that clogs coronary arteries with fatty, calcified plaques. As blood flow is gradually impeded, the body may compensate by growing a network of collateral arteries to circumvent blockages; the presence of collateral vessels may greatly reduce the amount of heart muscle damaged by a heart attack. In the early 1980s, researchers confirmed that the precipitating cause of nearly all heart attacks is not the obstructive plaque itself, but the sudden formation of a blood clot on top of plaque that cuts off blood flow in an already narrowed vessel.
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