Which is larger the basilar or MCA?
The basilar is 2x the size of the MCA
What is entry to the skull called?
Magnum foramen
The VA unite to form what?
The basilar artery
What is the flow direction in the VA?
Away
What is the flow direction of the BA?
Away.
How does the VA and BA flow relate?
The flow is kind of equal but the BA is higher.
What window can the VA be obtained in?
Transforamenal (suboccipital) window.
How should you move the probe while trying in insonate the VA?
Start at the midline at the nape of the neck groove and move towards the nose and sweep laterally.
What is the segment depth for the VA?
60-80 mm
What is the flow direction of the VA?
Away from the transducer
Where can the basilar artery be insonated?
Transformenal (suboccpital) window.
How should you move the probe while insonating the BA?
Start at the nape of the neck groove and angle the probe towards the nose.
What is the segment depth for the BA?
60-100
WHat is the flow direction of the BA?
Away from the transducer.
What type of waveform would a stenosis present?
A parvus tardus waveform.
What does a high-resistance flow and no diastolic flow indicate?
Distal obstruction
What is subclavian steal phenomenon?
It is a steno-occlusive disease of proximal subclavian artery with retrograde flow in the ipsilateral vertebral artery.
What are the two synonyms for subclavian steal syndrome?
- Subclavian steal phenomenon
- Subclavian steal steno-occlusive disease
What side of subclavian steal is most common and why?
The left side is most common because the BCA doesn’t stenois as quick.
What are the ymptoms of subclavian steal if the RT PCoM isnt opened?
Vertigo and balance issues.
What is the diagnostic test for subclavian steal?
Reactive hyperemia.
What are the two provocative maneuvers in steal syndrome?
- Inflation of pressure cuff on arm for 3 minues and rapid deflation.
- Exercising the diseased limb.
