Stenosis

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stenosis

[stə′nō·səs]
(medicine)
Constriction or narrowing, as of the heart or blood vessels.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Stenosis

 

the narrowing of a physiological opening or the lumen of a tubular organ. Examples of the former include stenosis of the left atrioventricular orifice of the heart, or mitral stenosis. Examples of the latter include stenosis of the intestine, trachea, bronchi, arteries, or pylorus of the stomach (pylorostenosis).

Stenoses may be congenital (developmental anomalies) or acquired, in which case they may be caused by a tumor or by scarring following an inflammatory process, ulcer, or trauma. Organic strictures are distinguished from functional stenoses, which result from a spasm of the musculature. Severe stenosis hampers the movement of blood, food, and air, and consequently the musculature of the organ located above the stenosis hypertrophies (compensated stenosis). Later, muscle tone decreases, the lumen of the organ above the stricture enlarges substantially, and the movement through the narrowed part becomes disrupted (decompensated stenosis).

Stenosis is treated surgically by enlarging the affected orifice, as in some cases of heart disease, by passing a bougie through the structure involved, by excising the constricted part, or by performing plastic surgery.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Results revealed significant differences in the distribution of homozygote TT genotype between patients with one and three stenotic vessels (p = 0.028), indicating the effect of this polymorphism on the severity of CAD.
Caption: Figure 2: (a) Colonoscopy identifies edematous stenotic lesion spreading over the entire circumference in the rectum at 10-18 cm from the anal verge.
Over decades, many researchers have carried out experimental models and computational simulations to explore the flow phenomena in the stenotic arteries in order to optimize medical methods of treatment.
Untreated, such aneurysms remain exposed to the high velocity jet created by the stenotic valve, and this wall stress may induce dissection or rupture.
Rigid bronchoscopy was done, and stenotic segment length was assessed.
In addition, fiberoptic or direct endoscopic examination, C T, magnetic resonance imaging, cine tracheography, and laryngotracheograms are very helpful in detecting stenotic segment width and localization in LTS diagnosis (6).
* Abnormal vascular networks in the vicinity of the occlusive or stenotic areas.
We conducted endoscopic balloon dilatation of the stenotic lesion using a 12-15 mm balloon via colonoscopy (Figure 3) and could pass the colonoscope through the stenosis.
With the advanced imaging technology and interventional hardware, Percutaneous Transluminal Angioplasty [PTA] and stenting is the treatment of choice for stenotic lesions.
It helps maintain the patency of stenotic vessels and avoid re-blockage due to blood accumulation or excessive tissue growth.