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11 Cards in this Set

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What is the minimal amount of recording time acceptable when performing clinical EEG?
The baseline record should contain at least 20 minutes of technically satisfactory recording.
What is the minumum number of scalp electrodes required when performing clinical EEG?
All 21 electrodes and placements following the International 10-20 System should be used.
What are the appropriate filter settings when performing clinical EEG?
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.
Why is the use of 60 Hz filter discouraged when performing EEG?
The 60 Hz filter can distort or attenuate spikes and should therefore only be used when other measure against 60 Hz interference fail.
What are the interelectrode impedance requirements when performing a clincal EEG?
electrode impedance should not exceed 5000 ohms (5 Kohms)
What is the correct documentation a clinical EEG record should contain?
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.
State three reasons it is important to have periods of eye opening and eye closing during the performance of a clincial EEG.
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.
What is the minimum number of scalp electrodes required when performing an EEG to determine electrocerebral silence (ECS)/electrocerebral in activity (ECI)?
A full set of scalp electrodes should be utilized when ever possible.
What are the interelectrode impedance requirements when performing an EEG to determine electrocerebral silence (ECS)/electrocerebral inactivity (ECI)?
Interelectrode impedances should be under 10,000 ohms but over 100 ohms.
What is the interelectrode distance requirement when perorming an EEG to determine electrocerebral silence (ECS)/electrocerebral inactivity (ECI)?
Interelectrode distance should be at least 10 centimeters.
What are the appropriate filter settings when performing an EEG to determine electrocerebral silence (ECS)/ electrocerebral inactivity (ECI)?
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.