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Aortic stenosis (AS or AoS) is the narrowing of the outlet of the main pumping chamber of the heart, the left ventricle (LV) (where the aorta begins). If the narrowing is severe (very tight) the extra work required from the left ventricle to pump the blood against the increased resistance of a small orifice may cause (initially adaptive) thickening of the heart muscle, followed by severe

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