Abdominal Ultrasound Flashcards
How does the normal aortic doppler signal appear superior and inferior to the renal arteries?
monophasic/biphasic flow
triphasic flow
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
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
What are velocities for aorta and renals?
aorta 60-120cm/s
renal artery 160-180
What criteria suggest stenosis in the renal artery?
RA/Aorta velocity (RAR)> 3.5 suggest >60% stenosis
need to correct for angle
What doppler criteria suggest RAS?
Main renal artery: RAR >3.5
dampening of doppler waveform in segmental arteries
acceleration index 70m/s
What are the RAS criteria?
% stenosis RAR PSV PSturbu
N 180 no
>60% >3.5 >180 yes
occluded N/A N/A N/A
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
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
what is the resistive index? and waht is abnormal?
RI=PSV-EDV/PSV
0.6 (with 0.7 upper limit of normal)
what is abnormal MPV size?
> 13mm
what is abnormal spleen size?
> 15mm
