Certified Polysomnographic Technician Certification Equipment Setup & Calibration Flashcards

What is the standard high-frequency filter (low-pass filter) setting for chin EMG channels in PSG?

Answer: 70 Hz

The standard high-frequency filter for chin EMG in PSG is 70 Hz, which removes high-frequency noise while preserving the EMG signal.

The reference electrode for EEG derivations in PSG is typically placed at which location?

Answer: Mastoid process (A1 or A2)

The mastoid processes (A1 for left, A2 for right) are the standard reference electrode sites for EEG derivations in PSG recording.

Which respiratory effort monitoring device measures thoracic and abdominal movement using inductive plethysmography?

Answer: Respiratory inductance plethysmography (RIP) belt

Respiratory inductance plethysmography (RIP) belts measure cross-sectional area changes of the thorax and abdomen to assess respiratory effort.

During CPAP titration, what does a technologist do when the patient continues to have obstructive apneas at the current pressure?

Answer: Increase pressure by 1–2 cm H₂O

When persistent obstructive apneas occur during CPAP titration, the technologist increases pressure by 1–2 cm H₂O per AASM titration protocols.

What is the purpose of the body position sensor in a PSG recording?

Answer: To document position-dependent respiratory events (e.g., supine vs. non-supine)

The body position sensor tracks patient position throughout the night to correlate respiratory events and sleep quality with body position, identifying positional OSA.

Which artifact in the EEG channel appears as a regular, large-amplitude deflection at ~1 Hz and is caused by cardiac electrical activity?

Answer: ECG artifact

ECG artifact appears as regular QRS-like deflections in EEG channels, caused by volume conduction of cardiac electrical signals through body tissue.