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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.
Aortic stenosis (AS) is the narrowing of the exit of the left ventricle of the heart such that problems result.It may occur at the aortic valve as well as above and below this level. It typically gets worse over time.Symptoms often come on gradually with a decreased ability to exercise often occurring first.ortic stenosis (AS) is the narrowing of the exit of the left ventricle of the heart such that problems result.