Tricuspid valve

The tricuspid valve, or right atrioventricular valve, is on the right dorsal side of the mammalian heart, at the superior portion of the right ventricle. The function of the valve is to prevent back flow (regurgitation) of blood from the right ventricle into the right atrium during right ventricular contraction: systole.

"Tricuspid" redirects here. For the type of tooth, see dental anatomy.
Tricuspid valve
Anterior (frontal) view of the opened heart. White arrows indicate normal blood flow. (Tricuspid valve labeled at bottom left.)
Heart in motion: the anterior walls of the ventricles are removed. The action of the tricuspid valve, located in the right ventricle, is seen on the left portion of this illustration. The three leaflets with their attached chordae tendineae and papillary muscles can be seen.
Details
Identifiers
LatinValvula tricuspidalis,
valva atrioventricularis dextra
MeSHD014261
TA98A12.1.02.003
TA23982
FMA7234
Anatomical terminology

Structure

The tricuspid valve usually has three leaflets, named the anterior, posterior, and septal leaflets.[1] Each leaflet is connected via chordae tendineae to the anterior, posterior, and septal papillary muscles of the right ventricle, respectively. Tricuspid valves may also occur with two or four leaflets; the number may change over a lifetime.[2]

Function
See also: Heart valves

The tricuspid valve functions as a one-way valve that closes during ventricular systole to prevent regurgitation of blood from the right ventricle back into the right atrium. It opens during ventricular diastole, allowing blood to flow from the right atrium into the right ventricle. The back flow of blood is also known as regression or tricuspid regurgitation.[3] Tricuspid regurgitation can result in increased ventricular preload because the blood refluxed back into the atrium is added to the volume of blood that must be pumped back into the ventricle during the next cycle of ventricular diastole. Increased right ventricular preload over a prolonged period of time may lead to right ventricular enlargement (dilatation),[4] which can progress to right heart failure if left uncorrected.[5]

Disorders

Tricuspid regurgitation is not uncommon.

Infected valves can result in endocarditis in intravenous drug users.[6][7] Patients who inject narcotics or other drugs intravenously may introduce infection, which can travel to the right side of the heart, most often caused by the bacteria S. aureus.[8] In patients without a history of intravenous exposure, endocarditis is more frequently left-sided.[8]

The tricuspid valve can be affected by rheumatic fever, which can cause tricuspid stenosis or tricuspid regurgitation.[9] Some individuals 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.[10]

Additional images
  • Tricuspid valve. Deep dissection.

References
  1. "Anatomy of the Tricuspid Valve". e-echocardiography.com. Retrieved 2018-03-30.
  2. Richard Van Pragh: Cardiac anatomy in A. C. Chang et al.: Pediatric Cardiac Intensive Care, Philadelphia 1998.
  3. Healthline Editorial Team. "Right atrioventricular valve (Tricuspid valve)". Healthline.
  4. Reynertson, Sandra I.; Kundur, Ramesh; Mullen, G. Martin; Costanzo, Maria Rosa; McKiernan, Thomas L.; Louie, Eric K. (1999-08-03). "Asymmetry of Right Ventricular Enlargement in Response to Tricuspid Regurgitation". Circulation. 100 (5): 465–467. doi:10.1161/01.CIR.100.5.465. ISSN 0009-7322. PMID 10430758.
  5. "Enlarged heart - Symptoms and causes". Mayo Clinic. Retrieved 2018-03-30.
  6. Demin AA, Drobysheva VP, Vel'ter OIu (2000). "[Infectious endocarditis in intravenous drug abusers]". Klinicheskaia meditsina (in Russian). 78 (8): 47–51. PMID 11019526.
  7. 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.
  8. 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.
  9. Tricuspid valve disease Mount Sinai Hospital, New York
  10. University Circle Inc. Archived 2008-06-17 at the Wayback Machine


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