What Is A Heart Attack? What Causes A Heart Attack?

If the heart muscle does not have enough blood (and consequently oxygen) it dies and a heart attack occurs. Another name for a heart attack is myocardial infarction, cardiac infarction and coronary thrombosis. According to Medilexicon's medical dictionary, a heart attack is "infarction of a segment of heart muscle, usually due to occlusion of a coronary artery".