1.2 Normal Flow Characteristics Flashcards
Proximal (suprarenal) Aorta has what waveform?
Low resistance
Low resistance waveforms have what characteristics?
Sharp systolic upstroke
Forward slow thru diastole
Typical velocity of Aorta Proximal to renals?
80-100 cm/s
Aorta Distal to renals has what waveform?
High resistance with reverse flow component
What type of waveform does the Main renal artery (MRA) have?
Low resistance
Typical velocity of MRA?
74-127 cm/sec
Velocites greater than ________ are abnormal and suggest a stenosis of > _________%
180 cm/s; >60%
Renal artery PSV to Aortic PSV ratio (RAR) is?
< 3.5
What area can cause velocity measurements to be very high?
Doppler angle at the renal oriface
Which artery has multiple branches and waveform similar to distal renal artery but with lower velocities?
Segmental artery
What does a normal segmental artery waveform look like?
Sharp systolic upstroke (ESP) early systolic peak
Diacrotic notch
What does a abnormal segmental artery waveform look like?
delayed acceleration time and rounded peak
What is the normal acceleration time of a segmental artery ?
< 0.07 seconds
What is the normal RI of a segmental artery?
< 0.75
What is the ABNORMAL acceleration time of a segmental artery ?
> 0.1 seconds
What is the grey zone for acceleration time of a segmental artery ?
> 0.07 - 0.1
What does an ABNORMAL segmental artery waveform look like?
Tardus parvus (dampened) waveform
What does a Tardus Parvus waveform look like
Loss of ESP (early systolic peak)
Flattened systolic upslope
Reduced color flow in kidney, unilaterally
What is the medullary artery called?
InterloBAR artery
What is the corticol artery called?
Arcuate artery
What is the parenchymal artery called?
interlobULAR artery
Where are the interloBAR ateries found?
Between the collecting system calyces
Where are the interlobar artery doppler signals obtained?
UP, Mid, LP
Interlobar artery waveforms are similar to segmental waveforms but the velocities are?
30-40cm/s
The corticol region of the kidneys are called the ____________arteries
Parenchymal arteries
What are the parenchymal/corticol arteries called?
Arcuate and Interlobular arteries
What is the End Diastolic ratio?
EDV/PSV
What is the End Diastolic ratio used for ?
to determine an increase in resistance
What is the normal End Diastolic ratio?
> 0.33
What is an ABNORMAL End Diastolic ratio?
< 0.23
What is the normal waveform for the renal veins near the IVC?
Pulsatile (close to heart)
What is the normal waveform for the renal veins distally?
Phasic (change with respiration)
