valve

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valve

 [valv]
a membranous fold in a canal or passage that prevents backward flow of material passing through it.
aortic valve a semilunar valve that separates the left ventricle and the aorta; it opens with end diastole, causing the second heart sound.
atrioventricular v's the cardiac valves between the right atrium and right ventricle (tricuspid valve) and the left atrium and left ventricle (mitral valve).
bicuspid valve mitral valve.
bicuspid aortic valve a congenital anomaly of the aortic valve, caused by incomplete separation of two of the three cusps; it is generally asymptomatic early in life but is predisposed to calcification and stenosis later on.
Braschi valve a one-way valve put into the inspiratory limb of a ventilator circuit in order to measure the intrinsic positive end-expiratory pressure.
cardiac v's valves that control flow of blood through and from the heart.
coronary valve a valve at the entrance of the coronary sinus into the right atrium.
flail mitral valve a mitral valve having a cusp that has lost its normal support (as in ruptured chordae tendineae) and flutters in the blood stream.
heart v's cardiac valves.
Heimlich valve a small one-way valve used for chest drainage, emptying into a flexible collection device; the valve prevents return of gases or fluids into the pleural space. The Heimlich valve is less than 13 cm (5 inches) long and facilitates patient ambulation; it can be used in many patients instead of a traditional water seal drainage system.
ileocecal valve (ileocolic valve) the valve guarding the opening between the ileum and cecum.
mitral valve the cardiac valve between the left atrium and left ventricle, usually having two cusps (anterior and posterior). Called also bicuspid valve.
Valves of the heart. The right heart pumps the venous blood into the lungs. The oxygenated blood returns from the lungs into the left atrium and is propelled by the left ventricle into the aorta. The insets show closed valves: the tricuspid valve has three leaflets, whereas the mitral valve has two leaflets. The aortic and pulmonary artery valves have three leaflets and resemble one another except for the fact that the coronary arteries originate from behind the cusps in the aorta. From Damjanov, 1996.
posterior urethral valve any of various types of congenital folds across the proximal part of the male urethra near the seminal colliculus, the most common cause of urethral obstruction in male infants.
pulmonary valve (pulmonic valve) the pocketlike cardiac valve that protects the orifice between the right ventricle and the pulmonary artery.
pyloric valve a prominent fold of mucous membrane at the pyloric orifice of the stomach.
semilunar v's the cardiac valves that have semilunar cusps; see aortic valve and pulmonary valve.
thebesian valve coronary valve.
tricuspid valve the cardiac valve guarding the opening between the right atrium and right ventricle.
valve of vein (venous v's) any of the small cusps or folds found in the tunica intima of many veins, serving to prevent backflow of blood.

valve

(valv), [TA]
1. A fold of the lining membrane of a canal or other hollow organ that serves to retard or prevent a reflux of fluid.
See also: valvule, plica.
2. Any formation or reduplication of tissue, or flaplike structure, resembling or functioning as a valve.
See also: valvule, plica.
Synonym(s): valva [TA]
[L. valva]

valve

(valv) a membranous fold in a canal or passage that prevents backward flow of material passing through it.
Enlarge picture
Valves of the heart.

aortic valve  that guarding the entrance to the aorta from the left ventricle.
artificial cardiac valve  a substitute, mechanical or composed of tissue, for a cardiac valve.
atrioventricular valves  the valves between the right atrium and right ventricle (tricuspid v. ) and the left atrium and left ventricle (mitral v. ).
Béraud's valve  a fold of mucous membrane sometimes occurring at the beginning of the nasolacrimal duct.
bicuspid valve  mitral v.
bileaflet valve  a heart valve prosthesis consisting of a circular sewing ring to which are attached two semicircular occluding disks that swing open and closed to regulate blood flow.
bioprosthetic valve  an artificial cardiac valve composed of biological tissue, usually porcine.
caged-ball valve  a heart valve prosthesis comprising a sewing ring attached to a cage composed of curved struts that contains a free-floating ball.
cardiac valves  those controlling the flow of blood through and from the heart.
coronary valve  that at the entrance of the coronary sinus into the right atrium.
flail mitral valve  a cardiac valve having a cusp that has lost its normal support (as in ruptured chordae tendineae) and flutters in the blood stream.
Houston's valves  permanent transverse folds, usually numbering three, in the rectum.
ileocecal valve , ileocolic valve that guarding the opening between the ileum and cecum.
mitral valve  that between the left atrium and left ventricle, usually having two cusps (anterior and posterior).
pulmonary valve  that at the entrance of the pulmonary trunk from the right ventricle.
pyloric valve  a prominent fold of mucous membrane at the pyloric orifice of the stomach.
semilunar valve  one having semilunar cusps, i.e., the aortic and pulmonary valves; sometimes used to designate the semilunar cusps composing these valves.
thebesian valve  coronary v.
tilting-disk valve  a heart valve prosthesis consisting of a sewing ring and a valve housing containing a suspended disk that swings between open and closed positions.
tricuspid valve  that guarding the opening between the right atrium and right ventricle.
ureteral valve  a congenital transverse fold across the lumen of the ureter, composed of redundant mucosa made prominent by circular muscle fibers; it usually disappears in time but may rarely cause urinary obstruction.

valve

(vălv)
n.
1. A membranous structure in a hollow organ or passage, as in an artery, that folds or closes to prevent the return flow of the body fluid passing through it.
2. Any of various devices that regulate the flow of gases, liquids, or loose materials through piping or through apertures by opening, closing, or obstructing ports or passageways.
3. The movable control element of such a device.

valve

[valv]
Etymology: L, valva, folding door
a natural structure or artificial device in a passage or vessel that prevents reflux of the fluid contents passing through it. Valves in veins are membranous folds that prevent backflow of blood. valvular, adj.

valve

1. A flapped or flap-like structure. See Aortic valve, Bicuspid valve, Bioengineered heart valve, Bioprosthetic valve, Ileocecal valve, Mitral valve, Pulmonary valve, Ross pulmonary porcine valve, Safe-Connect valve, Shiley heart valve, Tricuspid valve.
2. A device intended to limit the flow, or prevent the reversal of flow of a liquid or gas from point A to point B.

valve

(valv) [TA]
1. A fold of the lining membrane of a canal or other hollow organ serving to retard or prevent a reflux of fluid.
2. Any reduplication of tissue or flaplike structure resembling a valve.
See also: valvule, plica
[L. valva]

valve

(valv) [L. valva, leaf of a folding door]
Any of various membranous structures in a hollow organ or passage that temporarily close to permit the flow of fluid in one direction only.

aortic valve

Abbreviation: AoV
The valve at the junction of the left ventricle and the ascending aorta. It is composed of three segments (semilunar cusps) and prevents regurgitation. See: cardiac valve for illus.

Bauhin valve

See: Bauhin valve

Béraud valve

See: Béraud valve

bicuspid valve

Mitral valve.

Bjork-Shiley heart valve

A synthetic artificial heart valve that is no longer commercially available but remains implanted in thousands of patients. The valve has been known to fracture at its struts during use, which results in death in the majority of cases.
Enlarge picture
CARDIAC VALVES: with ventricles relapsed

cardiac valve

Any of the four valves that prevent the backflow of blood as it passes into, through, and out of the heart. In order of the entry of the venous blood into the right atrium, they are the tricuspid, pulmonary, mitral, and aortic. See: illustration

Carpentier-Edwards valve

See: Carpentier-Edwards valve.

check valve

A valve that permits fluids or gases to flow in just one direction. Check valves are used in infusion sets to prohibit backflow of fluids during intravenous therapy.

coronary valve

The coronary sinus valve at the entrance of the coronary sinus into the right atrium. Synonym: thebesian valve

eustachian valve

The valve at the entrance of the inferior vena cava.

external nasal valve

The outermost opening of the nose (the alar rim).

flutter valve

A one-way valve used in chest tube drainage systems that allows fluids or gases to flow out of the chest, but does not let them reenter the body
Synonym: Heimlich flutter valve; Heimlich valve

Gerlach valve

See: Gerlach valve

high-pressure relief valve

A safety device built into a ventilator circuit that protects the patient from excessively high airway pressures by venting excess pressure into the atmosphere.

Houston valve

See: Houston valve

Huschke valve

Lacrimal plica.

ileocecal valve

A projection of two membranous folds of the ileum of the small intestine into the cecum of the colon. It prevents backup of fecal material into the small intestine.
Synonym: valvula coli

inspiratory impedance threshold valve

See: inspiratory impedance threshold valve

internal nasal valve

Nasal valve.

Krause valve

See: Krause, Karl

left atrioventricular valve

Mitral valve.

mitral valve

The valve that closes the orifice between the left cardiac atrium and the left ventricle during ventricular systole.
Synonym: bicuspid valve; left atrioventricular valve

nasal valve

The site of greatest obstruction to airflow through the nasal passages. It extends from the bony cave near the piriform aperture into part of the cartilaginous vestibule of the nose. Synonym: internal nasal valve

pop-off valve

A safety valve that releases gas into the atmosphere from a ventilator circuit when the pressure in the circuit exceeds a known, safe level.
Enlarge picture
TYPES OF MECHANICAL HEART VALVES: A. caged ball valve; B. monoleaflet. C. bileaflet

prosthetic heart valve

A substitute valve used to replace a diseased valve. There are two main types of prostheses: those made from biological tissues, e.g., the heart valves of animals, esp. pigs, and those made from biocompatible materials, e.g., metals or polymers. Biocompatible mechanical valves may be constructed in a variety of ways, e.g., from a ball that moves up and down in a cage; with bileaflet valves that close in the midline; or with a single leaflet (which tilts to open and close). See: illustration

pulmonary valve

The valve at the junction of the right ventricle and pulmonary artery. It is composed of three semilunar cusps and prevents regurgitation of blood from the pulmonary artery back into the right ventricle. See: cardiac valve for illus.

pyloric valve

The prominent circular membranous fold at the pyloric orifice of the stomach. Synonym: valvula pylori

reducing valve

A device to reduce the pressure of gas that has been compressed in a cylinder.

right atrioventricular valve

Tricuspid valve.

semilunar valve

The type of valve separating the heart and aorta and the heart and pulmonary artery. See: cardiac valve for illus.

thebesian valve

Coronary valve.

tricuspid valve

Abbreviation: TV
The valve that closes the orifice between the right cardiac atrium and right ventricle during ventricular systole. Synonym: right atrioventricular valve; valvula tricuspidalis See: cardiac valve for illus.

valve of Varolius

Ileocecal valve.

valve

A structure that allows movement in a predetermined direction only. There are valves in the heart, the veins, the lymphatics, the urethra and elsewhere.

valve

  1. a piece of tissue that enables the movement of a liquid (e.g. blood), in one direction only.
  2. the lid-like part of the shell of brachiopods and barnacles.
  3. either shell of a bivalve molusc.
  4. the lid of some ANTHERS.

Valve

Tissue in the passageways between the heart's upper and lower chambers that controls passage of blood and prevents regurgitation.

valve

fold/or flap in lining of a tubular structure; prevents content reflux

valve

(valv) [TA]
1. Fold of lining membrane of a canal or other hollow organ that serves to retard or prevent fluid reflux.
2. Any formation or reduplication of tissue, or flaplike structure, resembling or functioning as a valve.
[L. valva]

valve,

n a structure that controls flow of the contents of a canal or passage.
valve, exhalation,
n a valve that permits escape of exhaled gases into the atmosphere and prevents them from being rebreathed.

valve

1. a membranous fold in a canal or passage that prevents backward flow of material passing through it.
2. a mechanical device to regulate the flow of liquid or gas from an area of higher pressure to one of lower pressure.
3. automatic valve which maintains a steady vacuum in the system of a mechanical milking machine.

Adam's pressure reducing valve
see reducing valve (below).
aortic valve
see aortic valve.
atrioventricular v's
the valves between the right atrium and right ventricle (tricuspid valve) and the left atrium and left ventricle (mitral valve).
bicuspid valve
mitral valve.
cardiac v's
valves that control flow of blood through and from the heart. See also aortic valve, mitral valve, pulmonary valve, tricuspid valve.
coronary valve
a valve at entrance of the coronary sinus into right atrium.
flair valve
a cardiac valve having a cusp that has lost its normal support (as in ruptured chordae tendineae) and flutters in the bloodstream.
ileocecal valve, ileocolic valve
see ileocecal valve.
nonreturn valve
in anesthetic circuits, it prevents exhaled gas from returning to the patient.
portal valve
regulates the amount of venous blood entering the kidney.
pressure reducing valve
see reducing valve (below).
pyloric valve
a prominent fold of mucous membrane at the pyloric orifice of the stomach.
reducing valve
a special valve used on anesthetic machines and which reduces the pressure of the gas reaching the exit valve so that control of the flow is made easier. Called also regulator.
semilunar v's
valves made up of semilunar segments or cusps (valvulae semilunares), guarding the entrances into the aorta and pulmonary artery.
thebesian valve
coronary valve.
valve tube
a thermionic diode that permits the flow of electric current in an x-ray machine in only one direction.

Patient discussion about valve

Q. How does alcohol affect someone who has been diagnosed with aortic valve stenosis? My brother has been diagnosed with aortic valve stenosis and also is a smoker and does drink alcohol on the weekends. He knows that he should stop smoking but what about the effects of alcohol? Does this also contribute to his stenosis?

A. Alcohol changes blood pressure and speed of the heart- that is not a good idea if you have an Aortic stenosis. Could probably makes things worst. I would avoid alcohol… but he should ask GP.

More discussions about valve