TCD (transcranial Doppler) Flashcards by Patricia Lee

Q

0 degree angle

A

all TCD

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Q

C1

A

cervical

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Q

C2

C3

A

petrous

lacerum

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Q

C4

C5

A

cavernous

clinoid

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Q

C6

C7

A

supraclinoid

communicating (terminal)

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Q

collateral supratrochlear

A

superior temporal

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Q

collateral dorsal nasal

A

facial

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Q

PULSED WAVE

A

TCD

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Q

No CW

A

TCD

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Q

Color is pulsed wave

A

never CW

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Q

mean velocity

A

correlates with perfusion

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Q

MCA depth

A

30-60 mm

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Q

ACA/MCA bifurcation

A

55-65 mm bidirectional

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Q

ACA

A

60-80 mm away

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Q

ACA velocity

A

50 +/- 11 cm/sec away

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Q

P1

A

60-70 mm toward

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Q

P1 velocity

A

39 +/- 10 cm/sec

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Q

vertebral

A

60-90 mm away

Q

vertebral velocity

A

38 +/- 10 cm/sec

Q

basilar artery

A

80-120 mm away

Q

basilar velocity

A

30-57 cm/sec

Q

transorbital window : 4 levels

A

parasellar,

genu,

supraclinoid,

ophthalmic

Q

ophthalmic resistance

A

high

Q

most velocities 80 cm/sec

A

> 100 cm/sec bad

Q

siphon

A

60-80 mm

Q

terminal ICA

A

55-65 mm

ambiguous

Q

ophthalmic artery

A

40-60 mm,

toward

21 +/- 5 cm/sec

Q

M1

A

30-60 mm

toward

55 +/- 12 cm/sec

Q

P2

A

60-70 mm,

away,

40 +/- 10 cm/sec

Q

siphon (orbital window)

A

60-80 mm,

47 +/- 14 cm/sec

variable flow direction

Q

vasospasm in MCA

A

120-140 cm/sec mild (100-200)

140-200 cm/sec moderate (120-200)

> 200 cm/sec severe

43-67 cm/sec normal MCA

Q

Lindegard ratio (hemispheric index)

A

compares ICA to MCA for severity of vasospasm

Q

MCA/ICA ratio normal

(hemispheric index)

A

< 3

MCA 100-200 cm/sec

Q

MCA/ICA ratio

moderate vasospasm

A

5-7

MCA 120-200 cm/sec

Q

emboli

A

chirps or HITS

Q

brain death

A

flow reversal

Q

intraplaque hemorrhage

A

hypoechoic rim

Q

incidence fetal ICA

A

25%

Q

4 factors for vessel identification

A

depth direction

spatial

orientation

mean velocity

Q

Transorbital window: vessel direction of siphon and OA

A

parasellar and genu flow toward probe

supraclinoid flows away

ophthalmic flow toward

Q

MCA/ICA ratio

severe vasospasm

A

>7

velocity MCA > 200 cm/sec

Q

terminal ICA

A

55-65 mm

Q

ophthalmic artery collateral

A

abnormal side ACA reverses (toward)

Q

intracrancial collaterals for ACA

A

develop turbulence and reverses (toward)