Tricuspid valve

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Tricuspid valve
Diagram of the human heart (cropped).svg
Anterior (frontal) view of the opened heart. White arrows indicate normal blood flow. (Tricuspid valve labeled at bottom left.)
File:Gray495.png
Base of ventricles exposed by removal of the atria. (Tricuspid valve visible at bottom right.)
Details
Latin Valvula tricuspidalis,
valva atrioventricularis dextra
Identifiers
MeSH A07.541.510.893
Dorlands
/Elsevier
12843894
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TH {{#property:P1694}}
TE {{#property:P1693}}
FMA {{#property:P1402}}
Anatomical terminology
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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 function of the valve is to prevent back flow of blood into the right atrium.

Structure

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]

Function

The tricuspid valve prevents back flow of blood from the right ventricle into the right atrium during ventricular systole when it closes and allows blood to flow from right atrium into right ventricle during ventricular diastole when it opens. This valve is weakened by drug abuse. The back flow of blood is also known as regression or tricuspid regurgitation.[2]

Clinical significance

Tricuspid regurgitation is not uncommon in the tricuspid valve.

It is common for a valve to be infected resulting in endocarditis, in intravenous drug users.[3][4] 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 the bacteria S. aureus.[5] In other patients without a history of intravenous exposure, endocarditis is more frequently left-sided.[5]

The tricuspid valve can be affected by rheumatic fever, which can cause tricuspid stenosis or tricuspid insufficiency (also called tricuspid regurgitation).[6] 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.

Certain carcinoid syndromes can affect the tricuspid valve by producing fibrosis due to serotonin production by those tumors.

The first endovascular tricuspid valve implant was performed by surgeons at the Cleveland Clinic.[7]

Additional Images

References

  1. Richard Van Pragh: Cardiac anatomy in A. C. Chang et al.: Pediatric Cardiac Intensive Care, Philadelphia 1998.
  2. Healthline Editorial Team. "Right atrioventricular valve (Tricuspid valve)". Healthline.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. Demin AA, Drobysheva VP, Vel'ter OIu (2000). "[Infectious endocarditis in intravenous drug abusers]". Klinicheskaia meditsina (in Russian). 78 (8): 47–51. PMID 11019526. <templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  4. Lua error in Module:Citation/CS1/Identifiers at line 47: attempt to index field 'wikibase' (a nil value).
  5. 5.0 5.1 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. <templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  6. Tricuspid valve disease Mount Sinai Hospital, New York
  7. University Circle Inc

External links