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| Parameters for Two-dimensional echo | Mild | Moderate | Severe |
|---|---|---|---|
| Leaflets | Normal | May be abnormal | Abnormal |
| RA/RV/pulmonary annulus | Normal | May be dilated | Dilated |
| Jet length by CWD (mm) | <10 | 10-20 | >20 |
| Ratio of jet width/RVOT diameter (%) | <34 | 35-74 | >75 |
| CWD signal | Soft with slow acceleration | Dense and variable | Dense, steep deceleration (PHT <100 m/s) |
RA: Right atrium, RV: Right ventricle, CWD: Continuous wave Doppler, RVOT: Right ventricular outflow tract, PHT: Pressure half-time
