Diagnostic ultrasound ( PDFDrive )

CHAPTER 26 The Extracranial Cerebral Vessels 945
A
B
C
D
FIG. 26.38 Carotid Stent. (A) Normal right carotid stent (arrow) shows complete illing on color Doppler examination. (B) Transverse image
of carotid stent (arrow) in the carotid bulb shows residual plaque (arrowhead) in the lumen. (C) and (D) Left carotid stent shows visible narrowing
on color Doppler (C) and elevated velocities (D) consistent with a greater than 70% stenosis using standard carotid velocity criteria.
TABLE 26.4 Carotid Artery Stenosis Grading After Stent
Study Degree of Stenosis PSV (cm/sec) EDV (cm/sec) ICA/CCA PSV Ratio
Setacci et al. 207 <30% ≤104
30%-50% 105-174
50%-70% 175-299
≥70% ≥300 ≥140 ≥3.8
Zhou et al. 208 >70% >300 >90 >4
Lal et al. 209 ≥20% ≥150 >2.15
≥50% ≥220 ≥2.7
≥80% >340 ≥4.15
Armstrong et al. 210 >50% >150 >2
>75% >300 >125 >4
Chi et al. 211 ≥50% 240 2.45
≥70% 450 4.3
CCA, Common carotid artery; EDV, end diastolic velocity; ICA, internal carotid artery; PSV, peak systolic velocity.
Modiied from Chahwan S, Miller MT, Pigott JP, et al. Carotid artery velocity characteristics after carotid artery angioplasty and stenting. J Vasc
Surg. 2007;45(3):523-526 206 ; Fleming SE, Bluth EI, Milburn J. Role of sonography in the evaluation of carotid artery stents. J Clin Ultrasound.
2005;33(7):321-328. 198