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21 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Cavernous internal carotid artery is also called the... |
Carotid siphon |
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The vertebral arteries come together and form the... |
Basilar artery |
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What measurements are taken with the TCD alone? |
PSV,EDV,TAP-V, and PI |
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What is the fifth approach used to access cerebral vasculature? |
5th Atlas loop |
➰ |
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What is the percentage calculated for different variations of the Circle of Wills? |
50% |
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What is important with a transorbital approach? |
Power intensity must be reduced to limit direct eye exposure |
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What is Atlas approach used for? |
To evaluate the extracranial vertebral artery |
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In general, what criteria is used to identify intracranial vessels? |
MCA>ACA>PCA=BA=VA |
MAPBV |
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The VA confluence occurs at what depth? |
Approx 70mm |
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All of the following are normal findings of the ophthalmic artery except? |
Develops chronic restenosis |
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Which direction will normal flow of the carotid siphon travel? |
Flow may be forward, away, or both |
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What are the differences in flow of the P1 and P2 segments? |
P1 toward and P2 away |
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What is Lindegaard Ratio used for? |
Differentiating increased volume from decreased vessel diameter with high velocities |
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When the ECA to the ICA is reversed through the ophthalmic artery, what happens? |
Retrograde flow through OA Decreased pulsatility Diminishment of flow with compression of ECA branches |
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When scanning the submandibular approach, velocities are taken from the ICA to calculate what? |
Lindegaard Ratio |
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Conditions that produce stenosis |
Dissection, moyamoya disease, fibromuscular dysplasia (FMD) |
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What can affect intracranial velocities? |
Hematocrit, CO2, and age |
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TCD can be used to monitor emboli during procedures such as... |
Carotid endarterectomy, carotid stenting, coronary artery bypass graft (CABG), neurologic procedures |
CABG |
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Micro embolic signals detected during a TCD exam are called... |
HITS |
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Severe vasospasm is associated with.. |
MCA Mean velocities greater than 200 cm/s |
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High velocity and turbulent flow can be detected with all of the following... |
Severe stenosis, vasospasms, and hyperdynamic flow states |
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