A heart attack, also known as a myocardial infarction (MI), occurs when the blood flow to a part of the heart is blocked, depriving the heart muscle of oxygen and nutrients. This blockage is usually caused by the buildup of plaque (atherosclerosis) in the coronary arteries, which supply blood to the heart muscle. When the blood flow is reduced or completely blocked, the affected part of the heart muscle begins to die, leading to a heart attack.
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