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The TV is the largest and most apically positioned of the 4 cardiac valves (Figure 1) with a normal orifice area between 7 and 9 cm2 (9). Because of its large size and the low pressure differences between the right atrium (RA) and right ventricle (RV), peak transtricuspid diastolic velocities are typically lower than 1 m/s with mean gradients of <2 mm Hg (9). Similar to the mitral valve, the TV can be divided into 4 components: the leaflets, the papillary muscles, the chordal attachments, and the annulus (with attached atrium and ventricle) 7, 12, 13, 14, 15, 16. The leaflets and their relationship to the chordae and papillary muscle play an important role in TV closure during systole but also may be integrally related to RV size and function.

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