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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