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Depicts progressive coronary artery disease of the heart, showing normal blood flow throught the left main coronary artery contrasted with a blocked version with 95% occlusion. The left anterior descending (LAD) branch of the left coronary artery is called the "Artery of Sudden Death" because it supplies the left ventricle heart muscle. When the LAD is suddenly occluded, a fatal myocardial infarction, or heart attack, usually occurs.