Certified Polysomnographic Technician Certification Equipment Setup & Calibration Flashcards

What is the purpose of performing a biocalibration at the start of a PSG study?

Answer: To verify electrode and sensor function by having the patient perform specific maneuvers

Biocalibration involves having the patient perform specific maneuvers (eyes open/closed, looking left/right, breathing tasks) to confirm all electrode and sensor signals are accurate before sleep.

Which electrode impedance value is considered acceptable for PSG EEG recordings per AASM standards?

Answer: Less than 5 kΩ

AASM standards require electrode impedance to be less than 5 kΩ (ideally ≤5 kΩ) to ensure adequate signal quality for EEG recording.

What does a 60 Hz (or 50 Hz) notch filter remove from the PSG signal?

Answer: Electrical line noise interference

The notch filter eliminates power line frequency interference (60 Hz in the US, 50 Hz in Europe) that can contaminate biological signals.

For proper nasal airflow monitoring in PSG, which sensor is preferred for detecting hypopneas per AASM guidelines?

Answer: Nasal pressure transducer

AASM recommends a nasal pressure transducer as the preferred sensor for detecting hypopneas because it is more sensitive to partial airflow reductions than a thermocouple.

Where is the recommended placement site for the pulse oximetry probe to obtain the most reliable SpO2 readings during PSG?

Answer: Finger (index or middle)

The finger (typically index or middle finger) is the standard placement site for pulse oximetry during PSG due to reliable perfusion and signal stability.

Which conductive medium is used to lower electrode impedance and ensure good electrical contact between scalp electrodes and the skin?

Answer: Electrode gel or paste

Electrode gel or conductive paste is applied to scalp electrodes to reduce impedance and ensure stable, low-noise electrical contact between the electrode and skin.