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Diagnostic ultrasound ( PDFDrive )

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CHAPTER 27 Peripheral Vessels 1007

A

B

D

C

E

F

G

FIG. 27.66 Arteriovenous Fistula (AVF) Juxta-

Anastomotic Stenosis. (A) Peak systolic velocity (PSV)

measurement in the feeding artery 2 cm upstream (cranial)

to the anastomosis. PSV, 2.4 m/sec. (B) PSV measurement

at anastomosis is 7.5 m/sec, for a PSV ratio of >3 : 1,

consistent with juxta-anastomotic stenosis. (C)-(F) In

another patient, (C) juxta-anastomotic stenosis (arrow)

with vein narrowing approximately 1 cm from anastomosis.

*, Anastomosis; A, feeding artery. (D) Poststenotic draining

vein dilation (arrows) downstream from the stenosis. (E)

Color Doppler shows marked aliasing at the stenosis. (F)

Spectral Doppler measurement of stenosis is 6.7 m/sec.

(G) Spectral Doppler measurement 2 cm upstream in the

brachial artery measures 1.24 m/sec, for a PSV gradient

of >3 : 1, concordant with visual assessment of a high-grade

stenosis.

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