Intracranial disease (extra) Flashcards
where does anterior spinal artery originate
from vertebral arteries
what from does the posterior inferior cerebellar artery originate
vertebral artery
where does the anterior inferior cerebellar artery originate
basilar artery
where does the superior cerebellar artery originate from
basilar artery
where does the posterior cerebral artery originate from
basilar artery
what collateral pathways are created through opthalmic artery
1) supratrochlear with superficial temporal artery2) dorsal nasal with facial artery
what technicalities are there for transcranial doppler
0 degree anglemean velocity reported instead of peakuses pulse wave (not contiuous wave because continuous wave does not allow for depth discrimination)large sample volume (>10mm)2mHz or lower
what is the most shallow vessel on TCD
MCA
what are the values for severe MCA vasospasm
> 200 cm/sec
what does a velocity of >200cm/s in MCA indicate
severe vasospasmincreased risk of stroke with sickle cell disease
most common Circle of Willis anomaly
absence or hypoplasia of one or both communicating arteries
what are the TCD windows
transtemporal, occipital, transorbital, submandibular
what vessels can you see through the transtemporal window
MCA, ACA, PCA and terminal ICA
MCA TCD characteristics
transtemporal window
30-60 depth
towards flow
55 +/- 12 velocity
MCA/ACA TCD characteristics
transtemporal window
55-60 depth
bidirectional flow