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Vascular board review (myultrasoundtutor) > Transcranial Doppler > Flashcards

Transcranial Doppler Flashcards

1
Q

What MHz transducer is used for TCD’s

A

2 MHz PW

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2
Q

What must the angle be for TCD’s

A

0

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3
Q

Why must you use PW for TCD’s

A

range resolution (depth or location)

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4
Q

Name the 4 windows used for TCD’s

A

1) transorbital
2) Transtemporal
3) Transforamenal
4) Submandibular

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5
Q

What is another name for transforamenal

A

suboccipital

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6
Q

What vessels use a transtemporal window

A

1) ACA
2)MCA
3) Terminal ICA
4) PCA

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7
Q

What is the depth for the ACA

A

60-80

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8
Q

What direction does the ACA go

A

Retrograde (away)

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9
Q

What is the depth for the MCA

A

30-60

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10
Q

What direction does the MCA go

A

Antegrade (towards)

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11
Q

What is the depth for the terminal ICA

A

55-65

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12
Q

What direction does the terminal ICA go

A

Bidirectional

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13
Q

What depth is used for the PCA

A

60-70

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14
Q

What direction does the PCA go

A

Antegrade (towards)

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15
Q

What vessels use a transorbital approach

A

1) opthalamic
2) ICA syphon

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16
Q

What is the depth for the opthalamic

A

40-60

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17
Q

What direction does the opthalamic go

A

Antegrade (towards)

18
Q

What vessel depth is used for the ICA syphon

A

60-80

19
Q

What direction does the ICA syphon go

A

Bidirectional

20
Q

What vessels use a transforamenal window

A

1) basilar
2) vertebral

21
Q

What vessel depth is used for the basilar

A

70-120

22
Q

What direction does the basilar go

A

Retrograde (away)

23
Q

What vessel depth is used for the vertebral

A

60-90

24
Q

What direction does the vertebral go

A

Retrograde (away)

25
Q

For cross over the contralateral ICA to ACA to ipsilateral ACA is through which artery

A

anterior communicating artery

26
Q

what is the normal flow direction of the basilar artery

a) away from the probe
b) bidirectional
c) towards the probe
d) positive doppler shift

A

a) away from the probe

27
Q

What is an indication of vasospasm due to cerebral hemorrhage

a) EDV>140cm/s in the ICA
b) turbulent flow in communicating vessels
c) PSV>120cm/s in MCA
d) tardus parvus in ACA

A

c) PSV > 120cm/s in MCA

28
Q

What is the best explanation for duplex findings which consist of high resistance flow patterns in the ICA and low resistance patterns in the ipsilateral ECA

a) posterior to anterior collaterization
b) collateralization via anterior communicating artery
c) collateralization via the external branches of the opthalamic artery
d) normal doppler patterns

A

c) collateralization via external branches of the opthalamic artery

29
Q

What is the normal flow direction of the MCA at the transtemporal window

a) bidirectional
b) antegrade
c) retrograde
d) variable

A

b) antegrade

30
Q

Which of the following scenarios could cause a low resistance pattern in the ECA

a) posterior to anterior collateralization
b) external to internal collateralization
c) subclavian steal
d) cross-over collateralization

A

b) external to internal collateralization

31
Q

When scanning through the transorbital window to evaluate the opthalamic artery, what should normal flow be

a) below the baseline
b) bidirectional
c) retrograde
d) antegrade

A

d) antegrade

32
Q

Upon TCD, a bidirectional signal is obtained at 57 mm depth from the temporal window. Which finding corresponds to what is being documented

a) anterior cerebral and anterior communicating artery flow
b) arteriovenous fistula
c) middle cerebral and anterior cerebral artery flow
d) mirror image artifact

A

c) middle cerebral and anterior cerebral artery flow

33
Q

Which intracranial vessel has retrograde flow scanning from the temple

a) MCA
b) ACA
c) ICA
d) PCA

A

b) ACA

34
Q

During TCD, what diagnostic finding would be consistent with left to right hemisphere collateralization

a) flow towards the transducer in the right MCA
b) flow towards the transducer in the left ACA
c) flow in the transducer in the right ACA
d) bidirectional flow in the left ICA bifurcation

A

c) flow towards the transducer in the right ACA

35
Q

A right handed patient presents with expressive aphasia and left paresis. Obstruction of which of the following vessels is most likely responsible for these symtpoms

a) left ICA
b) left vertebral
c) basilar
d) right ICA

A

d) right ICA

  • in a right handed person the left hemisphere is dominant for speech. A lesion in the left MCA would cause dysphasia or aphasia
36
Q

In TCD, with the probe placed over the right temporal bone, flow in the right ACA will be

a) oriented away from the probe
b) oriented toward the probe
c) oriented at 90 to the probe
d) the right MCA cannnot be seen from this window

A

a) oriented away from the probe

37
Q

In TCD, with the probe placed in the foramen magnum window, flow toward the probe in the vertebral artery is indicative of

a) normalcy
b) subclavian steal
c) basilar artery stenosis
d) ICA stenosis

A

b) subclavian steal

38
Q

A TIA of left amaurosis fugax is caused by a blockage in what vessel

a) Right ICA
b) Left ICA
c) Left ECA
d) Left CCA

A

b) Left ICA

-Left eye= Left ICA
amaurosis fugax always goes with the same side ICA

39
Q

The blood flow velocity parameter commonly reported in transcranial doppler is:

a) peak systolic velocity
b) flow volume
c) time-averaged peak velocity
d) time-averaged mean velocity

A

c) time-averaged peak velocity

39
Q

TCD findings of vasospasm in subarachnoid hemorrhage are

a) absent flow in the MCA
b) reversal of flow in the MCA
c) bi-directional flow in the MCA
d) greatly increased mean velocities in the MCA

A

d) greatly increased mean velocities in the MCA

40
Q

Which of the following is TCD not indicated for?

a) vasospasm
b) sickle cell disease
c) temporal arteritis
d) ophthalmic artery occlusion

A

c) temporal arteritis

Vascular board review (myultrasoundtutor) (23 decks)

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