Estimate of stenosis of artery by flow velocity in peripheral arterial occlusive disease
Severity of a stenosis can be estimated by measuring of peak systolic velocity (PSV) in the stenosis and proximal to it and by the appearance of the waveform.
| Luminal narrowing | PSV stenosis / PSV proximal | Description |
|---|---|---|
| 0 - 49% | <2 | triphasic waveform, spectral broadening, increased enddiastolic flow velocity in stenosis close to 49% |
| 50 - 74% | ≥2 | biphasic or monophasic waveform, increased enddiastolice flow velocity, spectral broadening, disturbed or diminished flow distal to the stenosis |
| 75 - 99% | ≥4 | monophasic waveform with marked increase of enddiastolic flow velocity; markedly disturbed flow (turbulent flow), spectral broadening and diminished flow distal to the stenosis |
| occlusion | no flow | high-resistance flow proximal to the stenosis |
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