EEG Routine 5

Question 1

Which montage type records the voltage difference between each electrode and a common average of all electrodes?

Accepted Answer

Common average reference montage

Answer

The common average reference montage uses the mathematical average of all scalp electrodes as the reference for every channel.

Question 2

A patient falls asleep during a routine EEG. Which feature confirms Stage N2 sleep?

Accepted Answer

Sleep spindles and K-complexes

Answer

Stage N2 sleep is defined by the presence of sleep spindles (12–14 Hz) and/or K-complexes on the EEG.

Question 3

What is the standard low-frequency filter (LFF) setting used in routine clinical EEG?

Accepted Answer

1 Hz

Answer

A low-frequency filter of 1 Hz (high-pass filter) is the standard setting for routine EEG to reduce slow baseline drift.

Question 4

During a routine EEG, the technologist notes high-amplitude, repetitive muscle artifact obscuring temporal channels. What is the best initial intervention?

Accepted Answer

Ask the patient to relax the jaw and facial muscles

Answer

Temporal muscle artifact is best reduced by instructing the patient to relax the jaw and facial muscles to reduce EMG contamination.

Question 5

Which of the following is NOT a standard activation procedure in a routine adult EEG?

Accepted Answer

Cold caloric stimulation

Answer

Cold caloric stimulation is a vestibular bedside test, not a standard EEG activation procedure; HV, photic stimulation, and sleep deprivation are standard.

EEG - Electroencephalography Practice Test

EEG - Electroencephalography Practice Test

EEG Routine 5