BRPT Scoring Artifacts and Troubleshooting 3

Question 1

When troubleshooting an intermittent PSG artifact, which approach is most effective?

Accepted Answer

Observe the artifact's timing, pattern, and correlation with other channels to identify its source

Answer

Replace all electrodes and restart the study immediately

Answer

Apply all available filters simultaneously to suppress it

Answer

Mark every affected epoch as unscorable and continue

Question 2

During a split-night CPAP titration, CPAP pressurized airflow most directly causes artifact on which channels?

Accepted Answer

Thermistor, nasal pressure, and respiratory effort channels

Answer

EEG channels

Answer

EOG channels

Answer

Chin EMG channels

Question 3

A 60 Hz notch filter is used in PSG recordings to:

Accepted Answer

Selectively eliminate AC power line frequency interference

Answer

Remove slow sweat artifact below 0.5 Hz

Answer

Filter muscle artifact above 70 Hz

Answer

Reduce cardiac (ECG) artifact

Question 4

Movement artifact during PSG is best identified by:

Accepted Answer

Simultaneous large-amplitude irregular deflections across multiple channel types coinciding with body movement

Answer

Its presence exclusively on EEG channels

Answer

A regular periodic pattern at the respiratory rate

Answer

Its presence only on limb EMG channels

Question 5

Reference contamination artifact in EEG is characterized by:

Accepted Answer

The same artifact pattern appearing simultaneously on all channels that share the same reference electrode

Answer

High impedance at a single active scalp electrode

Answer

Movement artifact isolated to C3 or C4

Answer

60 Hz interference from the amplifier chassis

Question 6

The correct technique to determine whether a suspect signal during scoring is a true physiological event or artifact is to:

Accepted Answer

Cross-reference the signal with other channels, check its timing, and correlate it with known physiology

Answer

Delete the epoch and rescore without it

Answer

Apply a high-pass filter and rescore the epoch

Answer

Mark it as unscorable and continue