Narrowing of the AORTIC VALVE in the HEART which obstructs the ﬂow of blood through it, with serious eﬀects on the heart and the circulation. The muscle in the left ventricle works harder to compensate for the obstruction and thickens as a result. Stenosis is usually caused by the deposition of calcium on the valve and is commonly associated with ATHEROMA. Untreated, the condition leads to heart failure, but nowadays the stenosis can be treated surgically.
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