From: Utility of carotid duplex ultrasonography in a general inner-city hospital
Stenosis
PSV (cm/s)
N(%)
50-69%
228.9
62 (7.5%)
70-99%
556.1
11 (1.3%)
Near occlusion
Undetectable
3 (0.4%)
Total occlusion
10 (1.2%)
Vertebral
-
2 (0.2%)