Which statement best describes how tricuspid regurgitation severity is evaluated by echocardiography?

Which statement best describes how tricuspid regurgitation severity is evaluated by echocardiography?

• A. LV systolic function
• B. Pulmonary embolism scan
• C. Tricuspid regurgitation severity is evaluated by jet characteristics, vena contracta, and PISA
• D. Aortic dilation

Answer: (C)

Evaluating tricuspid regurgitation severity with echocardiography relies on analyzing the regurgitant jet in multiple, complementary ways. Jet characteristics from color Doppler give a quick impression of how large the backflow is, but jet size alone can be influenced by loading conditions, so it’s not definitive by itself. The vena contracta—the narrowest width of the regurgitant jet just downstream of the orifice—provides a more consistent, flow-independent indicator of how much regurgitant orifice is present—the wider it is, the more severe the regurgitation tends to be. The PISA method uses the hemispherical flow convergence region proximal to the regurgitant orifice to estimate the effective regurgitant orifice area (EROA); from this, and the velocity-time integral of the regurgitant jet, you derive a quantitative regurgitant volume. Together, jet characteristics, vena contracta, and PISA-derived measures give a comprehensive assessment of TR severity. Other findings like LV function, external imaging tests, or aortic/root measurements don’t directly grade TR severity.

Evaluating tricuspid regurgitation severity with echocardiography relies on analyzing the regurgitant jet in multiple, complementary ways. Jet characteristics from color Doppler give a quick impression of how large the backflow is, but jet size alone can be influenced by loading conditions, so it’s not definitive by itself. The vena contracta—the narrowest width of the regurgitant jet just downstream of the orifice—provides a more consistent, flow-independent indicator of how much regurgitant orifice is present—the wider it is, the more severe the regurgitation tends to be. The PISA method uses the hemispherical flow convergence region proximal to the regurgitant orifice to estimate the effective regurgitant orifice area (EROA); from this, and the velocity-time integral of the regurgitant jet, you derive a quantitative regurgitant volume. Together, jet characteristics, vena contracta, and PISA-derived measures give a comprehensive assessment of TR severity. Other findings like LV function, external imaging tests, or aortic/root measurements don’t directly grade TR severity.