Tricuspid valve

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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
Dorlands/Elsevier v_02/12843894

The tricuspid valve is on the right side of the 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. Tricuspid valves may also occur with two or four leaflets, and the number may change during life.[1]

Contents

  • The largest cusp is interposed between the atrioventricular orifice and the conus arteriosus and is termed the anterior or infundibular cusp.
  • A second, the posterior or marginal cusp, is in relation to the right margin of the ventricle.
  • A third, the medial or septal cusp, to the ventricular septum.
  • The tricuspid valve prevents the blood from returning to the right atrium when the right ventricle contracts

A small amount of leakage or regurgitation is not uncommon in the tricuspid valve. It is a common valve to be infected (endocarditis) in IV drug users.[2][3] Although it is not a common site of endocarditis, patients with a small VSD usually develop endocarditis of the tricuspid valve.[citation needed]

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

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 physicians at the Cleveland Clinic. [4]

  1. ^ Richard Van Pragh: Cardiac anatomy in A. C. Chang et al.: Pediatric Cardiac Intensive Care, Philadelphia 1998.
  2. ^ Demin AA, Drobysheva VP, Vel'ter OIu (2000). "[Infectious endocarditis in intravenous drug abusers]" (in Russian). Klinicheskaia meditsina 78 (8): 47-51. PMID 11019526. 
  3. ^ 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. PMID 17073968. 
  4. ^ http://www.universitycircle.org/content/healthcare.asp

v • d • e
Anatomy of torso, cardiovascular system: heart
Structures atria (interatrial septum, musculi pectinati) • ventricles (interventricular septum, trabeculae carneae, chordae tendinae, papillary muscle) • valves • cusps
Regions base • apex • grooves (coronary/atrioventricular, interatrial, anterior interventricula, posterior interventricular) • surfaces (sternocostal, diaphragmatic) • borders (right, left)
Right heart (vena cavae, coronary sinus) → right atrium (auricle, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve of the inferior vena cava, valve of the 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 (auricle) → mitral valve → left ventricle → aortic valve (aortic sinus) → (aorta and systemic circulation)
Layers pericardium: fibrous pericardium • serous pericardium (pericardial cavity, epicardium/visceral layer) • pericardial sinus
myocardium • endocardium • cardiac skeleton (fibrous trigone, fibrous rings)
Conduction system Cardiac pacemaker • SA node • AV node• bundle of His • Purkinje fibers


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