Tricuspid and Pulmonary Valves
The tricuspid valve comprises three leaflets, and connects the right atrium to the right ventricle of the heart. The three leaflets are suspended from a ring of connective tissue. The leaflets are also connected to the right ventricle by tendons (chords). The valve regulates the flow of oxygen-poor blood from the body into the heart. Diseases of this valve are rarer than those affecting aortic or mitral valves. They are usually caused by leaking (tricuspid valve insufficiency), narrowing (tricuspid valve stenosis) or inflammation (endocarditis). Of these, tricuspid valve insufficiency is the most common disorder to affect the tricuspid valve.
The pulmonary valve connects the right ventricle of the heart to the artery leading to the lung. It regulates the flow of oxygen-poor blood between the heart and lung. Diseases of this heart valve are very rare. They are usually caused by narrowing (pulmonary valve stenosis), leaking (pulmonary valve insufficiency) or inflammation (endocarditis). If it is damaged, this valve must often be replaced.