tricuspid valve: Definition from Answers.com

Tricuspid valve

Anterior (frontal) view of the opened heart. White arrows indicate normal blood flow. (Tricuspid valve labeled at bottom left.)

Base of ventricles exposed by removal of the atria. (Tricuspid valve visible at bottom right.)
Latin	valva atrioventricularis dextra, valvula tricuspidalis
Gray's	subject #138 531
MeSH	Tricuspid+Valve

The tricuspid valve, or right atrioventricular valve, is on the right dorsal side of the mammalian heart, between the right atrium and the right ventricle. The normal tricuspid valve usually has three leaflets and three papillary muscles. They are connected to the papillary muscles by the chordae tendineae, which lie in the right ventricle. Tricuspid valves will not always consist of three leaflets and may also occur with two or four leaflets; the number may change during one's lifetime.^[1]

Diseases

Tricuspid regurgitation is not uncommon in the tricuspid valve.

It is a common valve to be infected (endocarditis) in IV drug users.^[2]^[3] Patients who inject narcotics or other drugs intravenously may introduce infection, which will travel to the right side of the heart, most often caused by S. aureus.^[4] In other patients without a history of intravenous exposure, endocarditis is more frequently left-sided.^[4]

The tricuspid valve can be affected by rheumatic fever, which can cause tricuspid stenosis or tricuspid insufficiency (also called tricuspid regurgitation).^[5] Some patients are born with congenital abnormalities of the tricuspid valve. Congenital apical displacement of the tricuspid valve is called Ebstein's anomaly and typically causes significant tricuspid regurgitation.

The first endovascular tricuspid valve implant was performed by surgeons at the Cleveland Clinic.^[6]

Front of thorax, showing surface relations of bones, lungs (purple), pleura (blue), and heart (red outline). Heart valves are labeled with "B", "T", "A", and "P".
Apical view of valves

References

^ Richard Van Pragh: Cardiac anatomy in A. C. Chang et al.: Pediatric Cardiac Intensive Care, Philadelphia 1998.
^ Demin AA, Drobysheva VP, Vel'ter OIu (2000). "[Infectious endocarditis in intravenous drug abusers]" (in Russian). Klinicheskaia meditsina 78 (8): 47–51. PMID 11019526.
^ Butany J, Dev V, Leong SW, Soor GS, Thangaroopan M, Borger MA (2006). "Infective endocarditis of the tricuspid valve". Journal of cardiac surgery 21 (6): 603–4. doi:10.1111/j.1540-8191.2006.00313.x. PMID 17073968.
^ ^a ^b Mitchell RS, Kumar V, Robbins SL, Abbas AK, Fausto N (2007). Robbins Basic Pathology(8th ed.). Saunders/Elsevier.. pp. 406–8. ISBN 1-4160-2973-7.
^ Tricuspid valve disease Mount Sinai Hospital, New York
^ University Circle Inc

External links

SUNY Figs 20:07-04
Photo of model at Waynesburg College circulation/tricuspidvalve04
Cardiac Valve Animations - Perioperative Interactive Education Group - Cardiac Valve Animations

Anatomy of torso, cardiovascular system: heart (TA A12.1, TH H3.09.01, GA 5.524)

General

Surface	base · apex · grooves (coronary/atrioventricular, interatrial, anterior interventricula, posterior interventricular) · surfaces (sternocostal, diaphragmatic) · borders (right, left) · Openings of smallest cardiac veins

Internal	atria (interatrial septum, musculi pectinati, sulcus terminalis) · ventricles (interventricular septum, trabeculae carneae, chordae tendineae, papillary muscle) · valves · cusps · Atrioventricular septum cardiac skeleton Intervenous tubercle

Chambers

Right heart	(venae cavae, coronary sinus) → right atrium (atrial appendage, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve of inferior vena cava, valve of coronary sinus) → tricuspid valve → right ventricle (conus arteriosus, moderator band/septomarginal trabecula) → pulmonary valve → (pulmonary artery and pulmonary circulation)

Left heart	(pulmonary veins) → left atrium (atrial appendage) → mitral valve → left ventricle → aortic valve (aortic sinus) → (aorta and systemic circulation)

Layers

Endocardium	Heart valves

Myocardium	Conduction system: Cardiac pacemaker · SA node · AV node · bundle of His · Purkinje fibers

Pericardial cavity	Pericardial sinus

Pericardium	fibrous pericardium (Sternopericardiac ligaments) · serous pericardium (epicardium/visceral layer) · Fold of the left vena cava

M: HRT

anat/phys/devp

noco/cong/tumr, sysi/epon, injr

proc, drug (C1A/1B/1C/1D), blte

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