Chapter 26: venous continuous wave doppler Flashcards Preview

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Flashcards in Chapter 26: venous continuous wave doppler Deck (9)
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1

CW of venous system is used for

evaluation of DVT and venous incompetence

2

limitations of CW of venous system

unable to differentiate abnormal flow from DVT vs extrinsic compression
normal flow can be evident with partial or well collateralized thrombus

3

sources of false positive CW studies

extrinsic compression (tumors, pregnancy, ect)
peripheral arterial disease (PAD)
COPD

4

PAD can cause

decreased venous filling

5

COPD can cause

elevated central venous pressure

6

Sources of false negatives

collateral development
bifed system (multiple deep veins)

7

patient positioning for CW venous doppler exam

supine
leg externally rotated
hip and knee flex
position should facilitate venous filling (reverse trendelenburg extremities 30 degrees lower than heart)

8

what vessels do you image

CFV femoral popliteal and posterior tibial veins
from assymptomatic side to symptomatic side

9

venous flow patters

spontaneous
phasic
augment with distal compression
augment with proximal release