Abdominal Ultrasound Flashcards Preview

Vascular Surgery > Abdominal Ultrasound > Flashcards

Flashcards in Abdominal Ultrasound Deck (12):
1

How does the normal aortic doppler signal appear superior and inferior to the renal arteries?

monophasic/biphasic flow
triphasic flow

2

What are normal size measurements of the visceral vessels?

aorta 2-2.5
celiac 0.7
SMA 0.6
IMA 0.3
Renal 0.4-0.5

3

What is normal length of the kidneys?
what is the normal size of the parenchyma?
which kidney is usually bigger?

>9cm >13 large
>1 cm
L>R

4

What are velocities for aorta and renals?

aorta 60-120cm/s
renal artery 160-180

5

What criteria suggest stenosis in the renal artery?

RA/Aorta velocity (RAR)> 3.5 suggest >60% stenosis

need to correct for angle

6

What doppler criteria suggest RAS?

Main renal artery: RAR >3.5
dampening of doppler waveform in segmental arteries
acceleration index 70m/s

7

What are the RAS criteria?

% stenosis RAR PSV PSturbu
N 180 no
>60% >3.5 >180 yes
occluded N/A N/A N/A

8

What indicates portal hypertension?

MPV >13mm
absent variation in portal/splenic vein
deminished portal flow
hepato-fugal flow
varices
ascites/splenomeg
PVobstruction
turbulent hepatic artery flow

9

How do you know if a TIPS is malfunctioning?

no flow
shunt PSV 190 cm/s
change in shunt PSV by decrease of >40cm.s or increase in >60cm/s
MPV PSV <30cm/s
reversal of flow in hepatic veins
hepatopedal intrahepatic portal venous flow

10

what is the resistive index? and waht is abnormal?

RI=PSV-EDV/PSV
0.6 (with 0.7 upper limit of normal)

11

what is abnormal MPV size?

>13mm

12

what is abnormal spleen size?

>15mm