Fisch EEG Primer Chapter 2 Flashcards

Recording Electrodes

1
Q

Most common electrode types used

A

metallic discs or cups typically 4-10mm in diameter - same electrodes should be used for all recording locations

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2
Q

Needle scalp electrodes

A

no longer recommended for routine clinical use

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3
Q

Purpose of nasopharyngeal and transphenoidal electrodes

A

attempt to records activity from inferior temporal lobe - usually placed by physician since it often requires anesthetic sprays
NOTE: epileptiform discharges produced ONLY at nasopharygeal leads are artifact until proven otherwise

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4
Q

Materials used for recording electrodes

A

coated with gold, Chlorided silver, tin, platinum or any substance which does not react electrically with the electrolytes of the scalp

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5
Q

Typical electrical impendences should be in the range of

A

100 - 5000 ohms

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6
Q

EEG impendence greater than 5000 ohms can

A

attenuate the EEG and cause a 60Hz interference

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7
Q

EEG impedence less than 100 ohms often results from

A

accidental short circuits between electrodes

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8
Q

placement of electrodes should follow

A

the international 10-20 (21 recording sites) or modified 10-20 systems - these use bony landmarks for reproducible recordings

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9
Q

What is the purpose of recording non-cerebral potentials

A

detecting and identifying articats that contaminate the EEG of for monitoring other bodily functions

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10
Q

Electrocorticographic ball or wick electrodes

A

used during neurosurgical procedures, usually excision of epilptogenic foci

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11
Q

Subdural or Epidural Electrodes

A

used to localize epileptiform activity and to map cortical function - subdural grids can also be used stimulate underlying cortex

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12
Q

Depth Electrodes

A

used for EEG recording of deep structures, to define targets for surgical destruction, and for placement of stimulating electrodes for treatment of movement disorders

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13
Q

international 10-20 abbreviation “Fp”

A

Prefrontal/Frotopolar

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14
Q

international 10-20 abbreviation “F”

A

Frontal

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15
Q

international 10-20 abbreviation “C”

A

Central

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16
Q

international 10-20 abbreviation “P”

A

Parietal

17
Q

international 10-20 abbreviation “O”

A

Occipital

18
Q

international 10-20 abbreviation “A”

A

Auricular

19
Q

international 10-20 “odd numbers”

A

left sided

20
Q

international 10-20 “even numbers”

A

right sided

21
Q

international 10-20 subscript “z”

A

zero or midsaggital placement

22
Q

international 10-20 bony landmarks (4)

A

inion, nasion, left/right preauricular