**1.7 Tricuspid valve**

Tricuspid valve is a cardiac valve located in the right atrioventricular orifice, whose function is to open during diastole to allow blood to flow from the right atrium to the right ventricle and close during systole to prevent blood backing up into the right atrium.


**Figure 3.** *Left ventricle, long axis (left), and short axis (right).*

The tricuspid annulus is a fibrous ring with an average circumference of 105– 120 mm. The tricuspid annulus is very often dilated when the right ventricle is dilated (as in pulmonary hypertension) causing tricuspid regurgitation.
