A Typical Vascular Disorders Flashcards
This vessel is usually higher pitched.
ICA
This vessel is the most pulsatile
ECA
The vessel has the most increased flow during diastole
ICA
Helical flow is seen in the…
Bulb
Based on this vessel’s waveform morphology, it is more similar to peripheral vessels
ECA
The temporal tap causes oscillations in the …..
ECA
A narrow band of frequencies would be considered….
laminar flow
Hissing or squealing sounds in a cerebrovascular vessel would be indicative of..
Stenosis
Within a severe ICA stenosis, what do we expect to happen to the PSV and EDV?
Both increase substantially
The horizontal axis is….
Time
The brightness of the pixels corresponds with what on spectral display?
Amplitude
The sample volume used in PW Doppler is usually ..
kept as small as possible
The carotid bulb is most often located…
at the proximal internal carotid artery
A collateralized ECA (one that in feeding the brain via ICA-ECA connections) is the result of…
ipsilateral ICA occlusion
VA stenosis usually occur where?
Proximally
This view for imaging a stenosis is misleading when depended upon completely; and multiple approaches must be used in order to avoid recording inaccurate plaque formations.
transverse view
saggital, long view
Fatty Streak Plaque
Homogenous ( same throughout)
Low level echoes
Fibrous (Soft) Plaque
Homogenous
Low to medium echoes
Very dangerous
Complex Plaque
Low, medium and high level ( Heterogenous) echoes
soft and dense areas
Calcification
Very bright, highly reflective echoes
Acoustic shadows
Thrombosis
Fresh: same echogenicity of flowing blood
ICA
- higher pitched
- More Continuous than ECA
- Less Pulsatile
- Increased flow during diastole
Bulb
- Normal heliac flow will be evident proximally
- Blood flows in a spiral motion
- Flow is not traveling parallel to the walls
ECA
- Higher peripheral resistance
- More pulsatile than ICA
- More similar to peripheral vessels
CCA
Flow characteristics of both ICA and ECA
Distal to a stenosis what will your waveforms look like?
Dampened: decreased velocities
More rounded upstroke
An absent signal means what?
Occlusion
Very tight stenosis
Trickle flow
Globally elevated velocities can mean what?
Increased cardiac output
Aortic Regurgitation
Has sustained reversal of flow during diastole
