Table 14 Parameters by method and severity grading recommended by the British Society of Echocardiography
Method | Mild | Moderate | Severe |
|---|---|---|---|
Continuous wave (CW) jet density | Incomplete or faint | Dense | Dense |
Colour flow convergence (CFC) | None/very small | Â | Large |
Pressure half time (PHT) (ms) |  > 500 | 200–500 |  < 200 |
Jet width/LVOTd (%) |  < 25 | 25–65 |  > 65 |
Diastolic flow reversal in the DAo (cm/s) | Brief / none | Intermediate | Prominent holodiastolic ≥ 20cm/s velocity |
Vena contract width (cm) |  < 0.3 | 0.3–0.6 |  > 0.6 |
Effective regurgitant orifice area (EROA) (cm2) |  < 0.10 | 0.10–0.30 |  > 0.30 |
Regurgitant volume (RVol) (mL) |  < 30 | 30–60 |  > 60 |
Regurgitant fraction (RF) (%) |  < 30 | 30–50 |  > 50 |
Left ventricular (LV) size | Normal | Â | Dilated |