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11 Cards in this Set
- Front
- Back
What is the minimal amount of recording time acceptable when performing clinical EEG?
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The baseline record should contain at least 20 minutes of technically satisfactory recording.
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What is the minumum number of scalp electrodes required when performing clinical EEG?
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All 21 electrodes and placements following the International 10-20 System should be used.
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What are the appropriate filter settings when performing clinical EEG?
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The low frequency filter (LFF) should be no higher than 1 Hz of the high filter frequency (HFF) should be no lower than 70 Hz.
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Why is the use of 60 Hz filter discouraged when performing EEG?
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The 60 Hz filter can distort or attenuate spikes and should therefore only be used when other measure against 60 Hz interference fail.
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What are the interelectrode impedance requirements when performing a clincal EEG?
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electrode impedance should not exceed 5000 ohms (5 Kohms)
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What is the correct documentation a clinical EEG record should contain?
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As a minimum the EEG should have the name and age of the patient, the date of the recording, an ID number, and the name of the technologist.
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State three reasons it is important to have periods of eye opening and eye closing during the performance of a clincial EEG.
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1. Some rhythms can be masked by alpha activity with eyes closed;
2. to help differentiate cerebral activity from eye movement; and 3. some paroxysmal activity can only be seen with eye opening and eye closing. |
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What is the minimum number of scalp electrodes required when performing an EEG to determine electrocerebral silence (ECS)/electrocerebral in activity (ECI)?
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A full set of scalp electrodes should be utilized when ever possible.
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What are the interelectrode impedance requirements when performing an EEG to determine electrocerebral silence (ECS)/electrocerebral inactivity (ECI)?
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Interelectrode impedances should be under 10,000 ohms but over 100 ohms.
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What is the interelectrode distance requirement when perorming an EEG to determine electrocerebral silence (ECS)/electrocerebral inactivity (ECI)?
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Interelectrode distance should be at least 10 centimeters.
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What are the appropriate filter settings when performing an EEG to determine electrocerebral silence (ECS)/ electrocerebral inactivity (ECI)?
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To avoid attenuation of low voltage fast or slow activity, high frequency filter (HFF) should not be below 30 Hz and low frequency filter (LFF) should not be above 1 Hz.
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