| Parameter . | Normal . | Possible stenosis . | Significant stenosis . |
|---|---|---|---|
| Peak velocity (m/s)b | <3 | 3–4 | >4 |
| Mean gradient (mmHg)b | <20 | 20–35 | >35 |
| Doppler velocity index | ≥0.30 | 0.29–0.25 | <0.25 |
| Effective orifice area (cm2) | >1.2 | 1.2–0.8 | <0.80 |
| Contour of the jet velocity through the prosthetic valve | Triangular, early peaking | Triangular to intermediate | Rounded, symmetrical contour |
| Acceleration time (ms) | <80 | 80–100 | >100 |
| Parameter . | Normal . | Possible stenosis . | Significant stenosis . |
|---|---|---|---|
| Peak velocity (m/s)b | <3 | 3–4 | >4 |
| Mean gradient (mmHg)b | <20 | 20–35 | >35 |
| Doppler velocity index | ≥0.30 | 0.29–0.25 | <0.25 |
| Effective orifice area (cm2) | >1.2 | 1.2–0.8 | <0.80 |
| Contour of the jet velocity through the prosthetic valve | Triangular, early peaking | Triangular to intermediate | Rounded, symmetrical contour |
| Acceleration time (ms) | <80 | 80–100 | >100 |
aIn conditions of normal or near normal stroke volume (50–70 mL).
bThese parameters are more affected by flow, including concomitant aortic regurgitation.
| Parameter . | Normal . | Possible stenosis . | Significant stenosis . |
|---|---|---|---|
| Peak velocity (m/s)b | <3 | 3–4 | >4 |
| Mean gradient (mmHg)b | <20 | 20–35 | >35 |
| Doppler velocity index | ≥0.30 | 0.29–0.25 | <0.25 |
| Effective orifice area (cm2) | >1.2 | 1.2–0.8 | <0.80 |
| Contour of the jet velocity through the prosthetic valve | Triangular, early peaking | Triangular to intermediate | Rounded, symmetrical contour |
| Acceleration time (ms) | <80 | 80–100 | >100 |
| Parameter . | Normal . | Possible stenosis . | Significant stenosis . |
|---|---|---|---|
| Peak velocity (m/s)b | <3 | 3–4 | >4 |
| Mean gradient (mmHg)b | <20 | 20–35 | >35 |
| Doppler velocity index | ≥0.30 | 0.29–0.25 | <0.25 |
| Effective orifice area (cm2) | >1.2 | 1.2–0.8 | <0.80 |
| Contour of the jet velocity through the prosthetic valve | Triangular, early peaking | Triangular to intermediate | Rounded, symmetrical contour |
| Acceleration time (ms) | <80 | 80–100 | >100 |
aIn conditions of normal or near normal stroke volume (50–70 mL).
bThese parameters are more affected by flow, including concomitant aortic regurgitation.
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