Fisch EEG Primer Chapter 5 Flashcards

The product of the recording: the clinical EEG record

1
Q

Guidelines used in obtaining EEGs are established by

A

The American Clinical Neurophysiology Society

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2
Q

What is the minimum number of electrodes to be placed according to the international 10-20 system

A

21, electrodes should be silver chloride, gold, or equivalent and should ALL be composed of same material to avoid electrical interference from mismatch

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3
Q

What is the accepted range of electrical contact impedence at each electrode

A

100 - 5000 ohms tested at approximately 10Hz

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4
Q

The EEG recording should have what minimum number of channels?

A

8, but preferably more than 16, correctly localizing increases with number of channels

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5
Q

Amplifier sensitivity should usually be set between…

A

5-10 microV/mm and then adjusted as necessary - typically 7microV/mm

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6
Q

Low frequncy filters should initally be set to…

A

1Hz

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7
Q

High frequency filters should initally be set to…

A

70Hz

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8
Q

Routine calibration should be performed at what phase of recording?

A

Beginning and end by calibration pulses (square wave pulses), an electrode test, and from cerebral activity (biocalibration) of same elctrode pair tested in all channels.

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9
Q

Paper speed is routinely set to what speed?

A

3cm/s (30mm/s)

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10
Q

The required duration of artifact-free wakefulness that should be obtained…

A

20 minutes (each montage minimum of 2 minutes) - wakefulness should be demostrated by asking alerting questions (date, calculation, etc) and recording answers in corresponding record.

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11
Q

Activating procedures such as hyperventilation, photic stimulation and sleep should be performed in every case where…

A

seizure is suspected

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12
Q

All EEG recordings need to include which pertinent demographic data/record data?

A

name, age, date and time of recording, gestational/conceptional age (children), meds, cranial defects, instrument settings, any patient behavior that may influence recording!!

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13
Q

Newborn recordings typically require…

A

1 hours of recording to include quiet and active sleep, fewer number of elctrodes, adjusted sensitivity and filter setting for higher amplitude and slower potentials

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14
Q

Electrocerebral Inactivity (ECI)/Electrocerbral Silence (ECS) - standards for suspected cerebral brain death ()

A
  • no EEG activity over 2microV with scalp electrodes 10cm apart for at least 30 minutes, filters 1Hz/>30Hz, impendences 100 to <10,000 ohms
  • absent drugs/sedatives, hypothermia, or ciruclatory shock
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15
Q

EEG transmission by telephone requires…

A

-1 fully trained technician and1 fully equipped EEG instrument at both the transmitting and receiving sites

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16
Q

What is the preferred adhesive for EEG

A

Collodion glue, Pastes are a reasonable alternative but do not work as well for prolonged recordings

17
Q

Each EEG recording should include at least one of the following types of montage

A

Longitudinal bipolar, transverser bipolar, referential

18
Q

Changing filter settings should be a temporary maneuver and be properly documented because…

A

changing filter setting may produced misleading results

19
Q

Photic stimulation typically causes what seizure type…

A

generalized

20
Q

Develpment of seizures during photic stimulation can be avoided if…

A

photic stimulation is stopped if photoparoxysymal activity appears (epileptiform)