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Mechanism of Myocardial Infarction Due to Ruptured Coronary Artery. Shows clot movement within the left anterior descending (LAD) artery resulting in a myocardial infarction, or heart attack. Depicts two plaque-lined coronary arteries, one with a normal vessel lumen, or opening, and one with a greatly thinned out, dilated vessel opening. The latter graphic depicts the dilated blood vessel rupturing, releasing a large amount of plaque into the bloodstream.  .