BRPT Scoring Artifacts and Troubleshooting

Question 1

A 60 Hz artifact appearing simultaneously on ALL EEG channels most likely indicates a problem with which electrode?

Accepted Answer

The ground or reference electrode

Answer

An active scalp electrode (e.g., C3)

Answer

The chin EMG electrode

Answer

The leg EMG electrode

Question 2

ECG (cardiogenic) artifact in EEG channels is identified by:

Accepted Answer

Regular sharp deflections that align with QRS complexes on the ECG channel

Answer

Slow undulating baseline drift

Answer

High-frequency irregular bursts unrelated to heart rate

Answer

A sudden flat isoelectric segment

Question 3

Sweat artifact in a PSG EEG recording is characterized by:

Accepted Answer

Very slow, large-amplitude undulating baseline shifts below 0.5 Hz

Answer

High-frequency irregular activity above 100 Hz

Answer

Regular 60 Hz sinusoidal waves

Answer

Sudden sharp electrode-pop deflections

Question 4

An electrode pop artifact is best identified by:

Accepted Answer

A sudden sharp deflection or step change isolated to a single channel

Answer

Slow undulating waves on all channels

Answer

Regular 60 Hz sine waves on one channel

Answer

High-frequency muscle activity on all channels

Question 5

Muscle (EMG) artifact in EEG channels is characterized by:

Accepted Answer

High-frequency irregular activity typically above 100 Hz that obscures the EEG signal

Answer

Regular 60 Hz sine waves

Answer

Slow 0.5–2 Hz waves

Answer

Sharp K-complex-like deflections at irregular intervals

Question 6

When an electrode shows high impedance during PSG, what is the correct first troubleshooting step?

Accepted Answer

Re-prep the skin, reapply conductive gel, and re-seat the electrode

Answer

Replace the entire electrode set

Answer

Increase the amplifier sensitivity setting

Answer

Apply a 60 Hz notch filter