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Constriction or narrowing, as of the heart or blood vessels.



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 ?
Coronary calcium score was found to have a significant correlation with the presence of coronary artery stenosis (r= 0.
Thus, Gai's score appears to offer a feasible way to indicate physiological ischemia in significant coronary artery stenosis.
Long-term patency of internal thoracic artery grafts for coronary artery stenosis due to Kawasaki disease: comparison of early with recent results in small children.
Quantification of coronary artery stenosis with 16-slice MSCT in patients before CABG surgery: comparison to standard invasive coronary angiography.
5) Coronary angiography is used to establish the presence or absence of coronary artery stenosis due to CAD.
guide for measuring pressure coronary artery stenosis / 200-222-873
On comparison of the two risk scores, the discriminatory accuracy of the latter was significantly superior to the former in predicting 2vessel, 3vessel and left main diseases (p65 years, >3 risk factors for CAD, use of aspirin within the past 7 days, known coronary artery stenosis >50%, >2 episodes of angina within the past 24 hours, ST-segment deviation >0.
This technique is used in coronary catheterization to measure pressure difference across a coronary artery stenosis to determine the likelihood that the stenosis impedes blood flow, and thus oxygen delivery to the heart muscle causing myocardial ischemia.
We used Folts' model of critical coronary artery stenosis with endothelial damage, which measures platelet-rich thrombus accumulation from cyclic flow reductions (CFRs).
Washington, December 2 (ANI): A large study performed by Dutch researchers suggests that Cardiac CT can effectively assess coronary artery stenosis.
Patients treated with drug-eluting stents for coronary artery stenosis represent a challenging group of patients for subsequent perioperative management.
Our results show that dipyridamole stress-rest multidetector CT can evaluate both myocardial ischemia induced by dipyridamole and coronary artery stenosis," said Dr.

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