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

Table 4

Comparison of modified criteria for ISR after CAS.

Modified criteria for ISR after CAS
Stenosis (%)^a	PSV^b (cm/s)	ICA/CCA ratio
Lal et al. (2008) [29]
0–19	<150	<2.15
20–49	150–219
50–79	220–339	≥2.7
80–99	>340	≥4.15
AbuRahma et al. (2008) [28]
0–29	<154	<1.5
30–49	154–223
50–79	224–324	≥3.4
80–99	>325	≥4.5

^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.