blood vessel occlusion left anterior descending coronary artery occlusion 2018-05-15T16:57:52Z A surgical manipulation causing blockage of the left anterior descending coronary artery, the artery supplying blood to approximately half of the left ventricle of the heart including the anterolateral myocardium, apex, and interventricular septum. LAD blockage LAD occlusion XCO:0000549 experimental_condition_ontology interventricular artery occlusion jrsmith left anterior descending artery occlusion left coronary artery ligation widow maker occlusion