hypertrophic subaortic stenosis

stenosis /ste·no·sis/ (stĕ-no´sis) pl. steno´ses   [Gr.] stricture; an abnormal narrowing or contraction of a duct or canal.

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aortic stenosis  (AS) a narrowing of the aortic orifice of the heart or of the aorta near the valve.

hypertrophic pyloric stenosis  narrowing of the pyloric canal due to muscular hypertrophy and mucosal edema, usually in infants.

hypertrophic subaortic stenosis , idiopathic hypertrophic subaortic stenosis (IHSS) a form of hypertrophic cardiomyopathy in which the left ventricle is hypertrophied and the cavity is small; it is marked by obstruction to left ventricular outflow.

infantile hypertrophic gastric stenosis  congenital hypertrophy and hyperplasia of the musculature of the pyloric sphincter, leading to partial obstruction of the gastric outlet.

mitral stenosis  a narrowing of the left atrioventricular orifice.

pulmonary stenosis  (PS) narrowing of the opening between the pulmonary artery and the right ventricle, usually at the level of the valve leaflets.

pyloric stenosis  obstruction of the pyloric orifice of the stomach; it may be congenital or acquired.

renal artery stenosis  narrowing of one or both renal arteries, so that renal function is impaired, resulting in renal hypertension and, if stenosis is bilateral, chronic renal failure.

subaortic stenosis  aortic stenosis due to an obstructive lesion in the left ventricle below the aortic valve, causing a pressure gradient across the obstruction within the ventricle.

tricuspid stenosis  (TS) narrowing or stricture of the tricuspid orifice of the heart.

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hypertrophic subaortic stenosis,

a form of hypertrophic cardiomyopathy, in which the left ventricle is hypertrophied (commonly with disproportionate involvement of the interventricular septum), and the cavity is small. It is marked by obstruction to left ventricular outflow. Also called idiopathic hypertrophic subaortic stenosis, muscular subaortic stenosis.