EEG Artifact Identification 5

Question 1

A lateral eye movement artifact in a bipolar longitudinal montage will appear with opposite polarity at:

Accepted Answer

F7 and F8

Answer

Fp1 and Fp2

Answer

T7 and T8

Answer

O1 and O2

Question 2

Which of the following features best distinguishes tremor artifact from a true EEG rhythm?

Accepted Answer

Tremor artifact has a fixed frequency matching the patient's tremor rate

Answer

Tremor artifact is always frontally predominant

Answer

Tremor artifact only appears in referential montages

Answer

Tremor artifact shows phase reversal in bipolar montages

Question 3

A technologist uses a short-time constant (high-pass filter increase) to reduce which type of artifact?

Accepted Answer

Slow sweat artifact

Answer

Muscle artifact

Answer

60 Hz line noise

Answer

Electrode pop

Question 4

During sleep recording, repetitive, high-amplitude spike-like potentials appearing synchronously with each heartbeat across all leads are best identified as:

Accepted Answer

Cardiac (EKG) artifact

Answer

Vertex sharp waves

Answer

K-complexes

Answer

Frontal arousal rhythms

Question 5

Which montage change is most useful for confirming that a suspected artifact is truly artifactual rather than cerebral?

Accepted Answer

Switching between bipolar and referential montages

Answer

Switching from average to Laplacian reference

Answer

Increasing the sensitivity

Answer

Decreasing the time base

Question 6

A high-amplitude, sharply contoured discharge that appears only in a single channel and does not violate the "neighbor rule" of field spread is most likely:

Accepted Answer

An electrode artifact

Answer

A focal interictal epileptiform discharge

Answer

A breach rhythm

Answer

A vertex sharp wave

Question 7

Photomyogenic (photomyoclonic) response, which can mimic a photoparoxysmal response, differs in that it:

Accepted Answer

Is frontally predominant muscle artifact time-locked to each flash

Answer

Outlasts the stimulus train

Answer

Consists of generalized spike-wave discharges

Answer

Begins with a posterior predominance