TR Velocity / Pulmonary Artery Systolic Pressure
The peak velocity of the tricuspid regurgitation jet, used to estimate pulmonary artery systolic pressure. The non-invasive screening parameter for pulmonary hypertension.
Continuous-wave Doppler measures the peak velocity of a regurgitant jet across the tricuspid valve (TR velocity). The Bernoulli equation converts this velocity into a peak systolic pressure gradient between the right ventricle and right atrium, which (with an estimated right-atrial pressure) gives PASP.
A TR peak velocity >2.8 m/s (or estimated PASP >35 mmHg) is the echocardiographic screening threshold for pulmonary hypertension under ESC / ERS guidelines.
TR velocity measurement requires a clearly defined jet envelope and Bernoulli-compatible alignment; AI-assisted contour tracing reduces the variability typical of manual envelope tracing.