Stenosis

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stenosis

[stə′nō·səs]
(medicine)
Constriction or narrowing, as of the heart or blood vessels.

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.

References in periodicals archive ?
Multiple stenoses or occlusions totalling >15 cm with or without heavy calcification
Vorwerk, "Primary stent placement in hemodialysis-related central venous stenoses: The dangers of a potential 'Radiologic Dictatorship' [4] (multiple letters)," Radiology, vol.
To identify independent risk factors for mortality, multivariable logistic regression models were constructed using the following variables: age, sex, hypertension, diabetes mellitus, alcohol consumption, ischemic heart disease, smoking, multiple stenoses, stenosis severity, and plaque instability.
Femoral and iliac vein stenoses after prolonged femoral vein catheter insertion.
These included high-grade stenoses removed through carotid endarterectomy (CEA) and nonstenotic plaques recovered at autopsy.
Naylor, "Cerebral protection during open retrograde angioplasty/stenting of common carotid and innominate artery stenoses," British Journal of Surgery, vol.
Flow disturbance in carotid artery containing stenoses was also evaluated [8].
Neuroforaminal stenoses, in particular, indicated areas of potential nerve damage and inflammation, and additional analyses revealed herniation from spinal disc avulsions, as well as other disc challenges (Figure 1).
Percutaneous transluminal angioplasty versus endovascular stent placement in the treatment of venous stenoses in patients undergoing hemodialysis: intermediate results.
Des stenoses peuvent necessiter des reinterventions, a-t-il explique.
The steno-occlusive lesions were examined primarily by visual inspection as diameter stenoses. The degree of stenosis was detected using electronic callipers.