stenosis
/ste·no·sis/ (stĕ-no´sis) pl.
steno´ses [Gr.] stricture; an abnormal narrowing or
contraction of a duct or canal.
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.
Dorland's Medical Dictionary for Health Consumers. ©
2007 by Saunders, an imprint of Elsevier, Inc. All
rights reserved.
