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 It might be outdated or ideologically biased.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 ?
Hydrodynamic interaction of elastic membranes in a stenosed microchanne, Applied Mathematical Modelling 54: 361-377.
The stenosed artery is simplified into a parameterized cylindrical tube model and currently only the axisymmetric stenosis case is investigated for preliminary study.
The aim of this study is to investigate the hemodynamic parameter, the pressure distribution, and wall shear stress in a stenosed artery using Reynolds-averaged Navier-Stokes equations for turbulence fluid modelling and Newtonian equations for the translation and rotational motion of the bioparticles.
Caption: FIGURE 2: Stenosed colon segment with minimal erythema at second colonoscopy.
In the present study, the expression profiles of lncRNAs in human stenosed and nonstenotic uremic veins were examined via RNA-sequencing analysis.
Such representation of u makes continuity equation independent of geometry of symmetry, particularly in postbifurcation region, because lumen of the stenosed artery is axially nonsymmetric but radially symmetric.
Patients with anterior crossing vessel and UPJ>2 cm stenosed segment were not included in the study.
By giving input pressure 12,000pa, and 24,000pa the velocity is calculated and used as an input, u = u(t), v = 0 on inflow segment, u = v = 0, on stenosed vessel.
Many investigators have focused their attention on blood flow through stenosed arteries with single stenosis by Mekheimer [2, 3], Chakravarty and Mandal [4], Lee and Xu [5], who pointed out that the mathematical model becomes more accurate in the presence of an overlapping stenosis instead of a mild one.
To know more accurate physiologic variation in pressure drop in the stenosed arteries, a realistic model should be considered.
Degree of stenosis = (normal vessel diameter proximal to stenosis-diameter of stenosed part)/ normal vessel diameter proximal to stenosis x 100%.
The study of the fluid dynamical aspects of blood flow through a stenosed artery is useful for the fundamental understanding of circulatory disorders.