Transcranial Doppler 2

Question 1

Name the branches of the Ophthalmic artery

Answer 1

nasal, frontal, supraorbital

Question 2

Name the periorbital branches of the ECA

Answer 2

facial, superficial temporal

Question 3

Which intracranial vessel carries 80% of the cerebral hemispheres’ blood supplies?

Answer 3

MCA

Question 4

Upper limit of normal for MCA velocities

Answer 4

less than or equal to 90 cm/s

Question 5

average depth to midline of skull

Answer 5

8 cm

Question 6

normal resistance of the ophthalmic artery

Answer 6

high resistance

Question 7

Which vessel is responsible for contralateral CoW collateralization?

Answer 7

ACCA

Question 8

What would you notice in the recipient side ACA during contralateral CoW collateralization?

Answer 8

antegrade/reversed flow

Question 9

What would you notice in the donor side ACA during contralateral CoW collateralization?

Answer 9

greater than 150% increase in flow

Question 10

Which vessel is responsible for posterior to anterior CoW collateralization?

Answer 10

PCCA

Question 11

What would you notice during posterior to anterior CoW collateralization?

Answer 11

increased velocities in the PCA and PCCA

Question 12

What would you notice between the PCA and MCA during posterior to anterior CoW collateralization?

Answer 12

PCA velocities 125% higher than MCA velocities

Question 13

What would you notice during External to Internal collateralization?

Answer 13

retrograde/reversed flow in the ophthalmic artery

low resistance waveform in the ophthalmic artery

Question 14

Identify two signs of brain death

Answer 14

increased resistance/decreased diastolic flow and systolic flow
reversal or cessation of flow altogether

Question 15

A poor prognosis is associated with what daily increase in MCA velocities?

Answer 15

20 cm/s