Table 1.
Criteria for grading the severity of AS by AHA/ACC30 and European Association of Echocardiography/American Society of Echocardiography guidelines.29
| MILD | MODERATE | SEVERE | VERY SEVERE | |
|---|---|---|---|---|
| Peak aortic jet velocity (m/s) | 2.0–2.9 | 3.0–3.9 | ≥4.0 | ≥5.0 |
| Mean pressure gradient (mmHg) | <20 | 20–39 | ≥40 | ≥60 |
| Aortic valve area (cm2) | >1.5 | 1.0–1.5 | ≤1.0 | − |
| Indexed aortic valve area (cm2/m2) | >0.85 | 0.60–0.85 | <0.60 | − |
| Dimensionless index* | >0.50 | 0.25–0.50 | <0.25 | − |
Note:
*
The dimensionless index is defined as VTIAV/VTILVOT or VAV/VLVOT, where VTI is the velocity–time integral and V is the peak velocity.