Chapter 27: Duplex/color flow imaging Venous Flashcards Preview

Vascular Boards > Chapter 27: Duplex/color flow imaging Venous > Flashcards

Flashcards in Chapter 27: Duplex/color flow imaging Venous Deck (34):
1

Duplex of the venous system is used to

identify thrombosis
detect calf lesions
extrinsic compression vs intrinsic obstruction
eval soft tissue masses
detect venous incompetence
document re canalized channels of collaterals

2

to improve imaging for venous structures

adjust color scale to detect slower velocities
change wall filters
increase color gains

3

with chronic venous insufficiency what do you normally see

flow reversal with valsalva which indicates venous reflux

4

evaluation of chronic venous insufficiency

may use cuff inflation technique while scanning
with patient standing and bearing weight on the contralateral leg

5

cuff sizes for venous insufficiency testing

thigh - 19 x 40cm
calf 12 x 40cm
foot 12 x 40cm

6

rapid cuff inflator inflates

80 mmHg thigh
100 mmHg calf
120 mmHg foot

7

with cuff at thigh, doppler flow direction and peak velocities are assessed

cfv and saphenofemoral junction

8

with cuff at calf, doppler flow direction and peak velocities are assessed

PV and GSV

9

with cuff at foot

PTV evaluated

10

methods to identify venous reflux include

spectral analysis
color flow imaging

11

spectral analysis with chronic venous insufficiency

reversed venous flow lasting more than 30 seconds to 1 minute

12

color flow imaging and chronic venous insufficiency

color changed noted during prox compression maneuver or cuff deflation

13

ivc and pelvic vein eval begins at

level of umbilicus in transverse

14

eval of other abdominal vessels begins at

xiphoid process in transverse

15

normal lower extremity doppler venous signals

spontaneity- signal heard at all sites except PTVs
Phasisity varies with respiration

16

lower extremity phasicity

increase with expiration
decrease with inspiration

17

upper extremity phasicity

decreased with expiration
increases with inspiration

18

pulsatile venous flow can indicate

CHF

19

pulsatile flow is normal in which vessels

subclavian and innominate veins

20

with deep inspiration what happens to abdominal vessels

dilation

21

what vessels in abdomen have bi-directional pulsatile doppler signals

ivc
renal veins
hepatic veins

22

what vessels are minimally phasic with continuous doppler signals

portal vein
splenic vein
mesenteric vein

23

if flow is not spontaneous at the CFV FV and /or pop veins

an obstruction distal to or at that site is suggested

24

if flow is not phasic, but continuous

a proximal obstruction should be considered

25

if no augmentation with distal compression is seen

obstruction between where you are compressing and where you are listening

26

if flow increases during proximal compression

venous reflux

27

rouleau formation is

sluggish flow seen as heterogenous material moving through vein with respiration and augment maneuvers

28

rouleau formation may suggest

could be normal or could suggest prox obstruction

29

acute thrombosis

non compressible
spongy thrombus of low level echoes
dilation of vessel
no filling on color flow

30

chronic thrombosis

echogenic
collaterals
vessel not dilated

31

flow characteristics of chronic venous thrombosis

abnormal doppler
continuous or decreases phasicity
venous reflux lasting longer than 30 seconds or longer than 1 minute

32

color flow doppler of venous reflux

appears as a shift in color from flow away from probe to flow towards probe during valsalva or compression distal to transducer

33

budd chiari syndrome

thrombosis of Hepatic veins, sinuosoids, or ivc

34

clinical findings of budd chiari may include

hepatomegaly
abdominal pain
sudden ascites