Grading

Percentage of arterial stenosis in lower limb

Doppler ultrasound

finding

Number of patients N = 36

Normal

-

Normal triphasic flow

9

Grade 1

1% to 19% stenosis

Normal triphasic flow

12

Grade 2

20% to 49% stenosis

Triphasic waveform with an increase in peak systolic velocity ≥30% with respect to the proximal recording site

9

Grade 3

50% to 99% stenosis:

Monophasic waveform with an increase in peak systolic velocity ≥100% and marked spectral broadening. Distal waveform is abnormal

4

Grade 4

100% stenosis:

2