A heart attack, or acute myocardial infarction, happens when the blood supply to part of the heart muscle is severely reduced or stopped. The loss of blood or oxygen causes damage and potential death of heart tissue. Coronary Artery Disease (CAD) is the main cause of heart attack. A less common cause is a severe spasm of a coronary artery which also can prevent blood supply from reaching the heart.
According to the American Heart Association, about 785,000 Americans have an initial heart attack and another 470,000 have a recurrent heart attack each year.
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