mitral valve

valve (valv) a membranous fold in a canal or passage that prevents backward flow of material passing through it.

Valves of the heart.

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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.

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mitral valve

n.

A valve of the heart, composed of two triangular flaps, that is located between the left atrium and left ventricle and regulates blood flow between these chambers. Also called bicuspid valve, left atrioventricular valve.

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Mitral valve

A fold in between the left atrium and the left ventricle of the heart that directs blood that has received oxygen from the lungs to the aortic valve and the aorta.

Mentioned in: Cardiac Catheterization, Endocarditis, Heart Valve Replacement, Hypertrophic Cardiomyopathy, Pseudoxanthoma Elasticum

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mitral valve,

a bicuspid valve situated between the left atrium and the left ventricle; the only valve with two, rather than three, cusps. The mitral valve allows blood to flow from the left atrium into the left ventricle but prevents blood from flowing back into the atrium. Ventricular contraction in systole forces the blood against the valve, closing the two cusps and assuring the flow of blood from the ventricle into the aorta. The ventral cusp of the mitral valve is longer than the dorsal cusp. Also called bicuspid valve, left atrioventricular valve. Compare aortic valve, pulmonary valve, semilunar valve, tricuspid 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.

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mitral valve,

n a bicuspid valve situated between the left atrium and the left ventricle; the only valve with two, rather than three, cusps. It allows blood to flow from the left atrium into the left ventricle but prevents blood from flowing back into the atrium.

mitral valve prolapse (MVP),

n the protrusion of one or both cusps of the mitral valve back into the left atrium during ventricular systole, resulting in incomplete closure of the valve. It may or may not be associated with mitral insufficiency (regurgitation) or a “leaky valve” and cause a heart murmur. Also called
“floppy” mitral valve. In most cases, it is harmless and does not cause symptoms or need to be treated. Symptoms include sensation of feeling the heart beat (palpitations), chest pain (unrelated to coronary artery disease or a heart attack), difficulty breathing after exertion, fatigue, cough, shortness of breath when lying flat (orthopnea). Some forms seem to be hereditary. It has been associated with Marfan syndrome, Graves' disease, and other disorders.

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mitral

shaped like a miter; pertaining to the mitral valve.

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mitral area

that area of the thoracic wall through which sounds of the mitral valve can best be auscultated; generally the lower one-third of the mid- to anterior left thorax.

mitral atresia-hypoplastic left heart syndrome

defects in the development of the mitral valve, left heart and aortic valve, which occur rarely in cats.

mitral complex

includes the leaflets, annulus, chordae tendineae and papillary muscles of the mitral valve, left atrium and left ventricular muscle wall.

mitral insufficiency

a functional incompetence resulting in regurgitation of blood from the left ventricle to the left atrium during systole or from the great vessels into the left atrium during diastole.

mitral regurgitation

see mitral insufficiency (above).

mitral valve

the left atrioventricular valve, the valve between the left atrium and the left ventricle of the heart; it is composed of two cusps, anterior and posterior. Called also the bicuspid valve.

mitral valve prolapse (MVP)

a condition in which some portion of the mitral valve is pushed back too far during ventricular contraction. Often a complication of mitral endocardiosis.