Evoked Potentials Flashcards

1
Q

BAER: Abnormal I-III latency

A

Acoustic neuroma

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2
Q

BAER: Abnormal III-V

A

MS or adrenoleukodystrophy

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3
Q

Cause of bilateral P100 prolonged latency

A

Cannot localize, ON, tumor, retina, radiations or degenerative brain disease

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4
Q

Absence of waves I-V in BAER

A

No interpretation could be technical,

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5
Q

Wave I present but II-V absent

A

Brain death

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6
Q

Delayed N21 normal N21-P37

A

Conduction defect proximal to /peripheral to cauda equina

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7
Q

Abnormal N21-P37

A

Conduction defect above cauda equina but below sensory cortex

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8
Q

Absence of wave V

A

Defect rostral to pons

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9
Q

Abnormal N13-N20

A

Above medulla below thalamus

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10
Q

Delayed N21 and N21-P37

A

Peripheral to cauda equina and below sensory cortex

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11
Q

Delayed P37 absolute latency and abnormal N21-P37 latency

A

Conduction defect above cauda equina but below sensory cortex

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12
Q

During left tibial SSEP scalp recording electrodes are:

A

Cz and C3

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13
Q

Transcranial motor stimulation active electrode is

A

Anode

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14
Q

D wave in transcranial motor stimulate

A

From direct stimulation of dorsal corticospinal tracks

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15
Q

What can cause prolongation of peripheral cervical and central SSEP

A

Hypothermia

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16
Q

Etomidate does what to SSEP

A

Increase amplitude

17
Q

Inhalational agents do what to SSEP

A

Decrease amplitude

18
Q

Preferred click sensation level

A

65-70 dB

19
Q

Response fro each ear

A

2k-4K

20
Q

Filter for BAER

A

100-3000 Hz

21
Q

Age BAERs are like adult

A

2 yrs

22
Q

Difference in Baer late cites in baby

A

Increase

23
Q

Effect of latency and amp if increase click rate

A

Increase abs latency and decrease amp

24
Q

What age can you distinguish awake from sleep

A

30-34 wks

25
Q

Baer LFF

A

50-150

26
Q

Baer HFF

A

3000

27
Q

SSEP LFF

A

30

28
Q

SSEP amplification

A

100000

29
Q

SSEP HFF

A

3000

30
Q

What happens if inadequate stimulation with SSEP

A

Delayed latencies