Transcranial Doppler Flashcards

1
Q

Why do TCD?

A
  • assessment of pt w/suspicion of brain death (cerebral circulatory arrest)
  • collateral circulation patterns
  • documentation of subclavian steal*
  • evaluation of the vertbrobasilar system*
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2
Q

Limitations with TCD

A
  • recent eye surgery
  • hyperostosis of the temporal bone
  • non- imaging, inaccurate due to lack of anatomic landmarks
  • absent windows
  • anatomic anomalies
  • pt movement
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3
Q

doubling of the mean is only ___% diameter reduction

A

30

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4
Q

MCA

A
  • start at 50 depth
  • antegrade flow, 60 plus or minus 12 cm/sec
  • follow to a depth of 35-40mm (up to 65)
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5
Q

at what depth would you see the ‘butterfly’?

A

55-65mm

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6
Q

ACA

A
  • retrograde flow, 60-75mm
  • mean velocity 50 plus or minus 12
  • following the ACA to 80mm bidirectional flow noted
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7
Q

PCA

A
  • antegrade flow
  • depth 60-70; 39 plus or minus 10
  • flow can be antegrade or retrograde depending on what segment you are on
  • closing eyes will decrease flow
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8
Q

VA

A
  • suboccipital
  • depth 60-85mm; retrograde
  • 38 plus or minus 10
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9
Q

BA

A
  • suboccipital
  • retrograde, 85-120 depth
  • 41 plus or minus 10
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10
Q

OA

A
  • decrease power 10-20%
  • transorbital approach
  • 21 plus or minus 5
  • first branch of ICA
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11
Q

Carotid Siphon

A
  • transorbital
  • antegrade/retrograde flow 60-80mm
  • 47 plus or minus 14
  • plused doppler is important because of ability to control power (decreased 10-20%)
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12
Q

Submandibular Window

A
  • ICA is retrograde

- depth 50mm, 24-28cm

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