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The left main coronary artery arises from above the left portion of the aortic valve and then usually divides into two branches, known as the left anterior descending (LAD) and the circumflex (Circ) coronary arteries. In some patients, a third branch arises in between the LAD and the Circ.
Overview. Coronary ostial stenosis refers to the narrowing of the ostium part of the coronary arteries. An ostial lesion is defined as a lesion which begins within 3-5 mm of the origin of a major epicardial artery. key issue in the treatment of an ostial lesion is to assure that the stent is inserted proximal enough to fully cover the aorto-ostial junction (particularly in the right coronary artery). Essentially the operator must realize that the aortic wall is being stented as well.