Steno: From 1 Different Sources
combining form denoting 1. narrow. Example: stenocephaly (narrowness of the head). 2. constricted.
Narrowing of the AORTIC VALVE in the HEART which obstructs the ?ow of blood through it, with serious effects on the heart and the circulation. The muscle in the left ventricle works harder to compensate for the obstruction and thickens as a result. Stenosis is usually caused by the deposition of calcium on the valve and is commonly associated with ATHEROMA. Untreated, the condition leads to heart failure, but nowadays the stenosis can be treated surgically.... aortic stenosis
A disorder of the HEART in which obstruction of the out?ow of blood from the right ventricle occurs. Narrowing of the pulmonary valve at the exit of the right ventricle and narrowing of the pulmonary artery may cause obstruction. The condition is usually congenital, although it may be caused by RHEUMATIC FEVER. In the congenital condition, pulmonary stenosis may occur with other heart defects and is then known as Fallot’s tetralogy. Breathlessness and enlargement of the heart and eventual heart failure may be the consequence of pulmonary stenosis. Surgery is usually necessary to remove the obstruction.... pulmonary stenosis
An unnatural narrowing in any passage or ori?ce of the body. The word is especially used in connection with the four openings of the HEART at which the valves are situated. (See HEART, DISEASES OF.)... stenosis
Narrowing of the opening between the left ATRIUM and left VENTRICLE of the HEART as a result of rigidity of, and adhesion between, the cusps of the MITRAL VALVE. It is due, almost invariably, to the infection RHEUMATIC FEVER. The atrium has to work harder to force blood through the narrowed channel. The effects are similar to those of MITRAL INCOMPETENCE. Shortness of breath and palpitations and irregular beating (?brillation) of the atrium are common consequences in adults. Drug treatment with DIGOXIN and DIURETICS helps, but surgery to dilate or replace the faulty valve may be necessary.... mitral stenosis
The normal working of the TRICUSPID VALVE in the HEART is impeded by a narrowing of the opening, often as a sequel of RHEUMATIC FEVER. As with TRICUSPID INCOMPETENCE, heart failure may result and treatment is similar, with surgery to repair or replace the faulty valve an option.... tricuspid stenosis
(carotid stenosis) narrowing of the carotid artery, which reduces the supply of blood to the brain and is a cause of strokes. It is treated by surgical excision or bypass of the narrowed segment (see also endarterectomy) or by inserting a *stent into the carotid artery.... carotid artery stenosis
adj. (in ophthalmology) describing an optical device consisting of an opaque disc punctured with a fine slit or hole (or holes), which is placed in front of the eye in the same position as glasses and enables sharper vision in cases of gross long- or short-sightedness or astigmatism. It sharpens the image formed on the retina because it confines the light reaching the eye to one or more fine beams, which pass through the centre of the lens undeviated by refractive error. The same principle is used in the pin-hole camera.... stenopaeic
(stenostomy) n. the abnormal narrowing of an opening, such as the opening of the bile duct.... stenostomia
Health Encyclopedia