The Current Role of Carotid Duplex Ultrasonography in the Management of Carotid Atherosclerosis: Foundations and Advances

Table 1

University of Washington criteria [19].

University of Washington (Strandness)
Stenosis; (%)^a	PSV^b; (cm/s)	EDV^c; (cm/s)	Flow characteristics
1–15	<125	<140	No spectral broadening
16–49	<125	<140	Minimal spectral broadening
50–79	≥125	<140	Marked spectral broadening
80–99	≥125	>140	Marked spectral broadening
Occlusion	N/A	N/A	No internal carotid flow signal

^aBased on conventional angiography using least transverse diameter at the stenosis compared to the diameter of the distal uninvolved ICA where the arterial walls become parallel, ^bpeak systolic velocity, ^cend diastolic velocity.