RPSGT Technology & Tools 2

Question 1

Which filter setting is most appropriate for recording the EEG signal during a standard PSG?

Accepted Answer

High-pass 0.3 Hz, Low-pass 35 Hz

Answer

AASM recommends a high-pass filter of 0.3 Hz and low-pass filter of 35 Hz for EEG recording during PSG.

Question 2

What is the recommended paper speed (or display sweep) for standard PSG epoch scoring?

Accepted Answer

10 mm/sec (30-second epochs)

Answer

The standard PSG display speed is 10 mm/sec, yielding 30-second epochs as recommended by AASM.

Question 3

A positive occipital sharp transient of sleep (POSTS) is best identified on which EEG derivation?

Accepted Answer

O2-M1

Answer

POSTS are maximal over occipital regions and best seen on O1/O2 derivations referenced to the contralateral mastoid.

Question 4

Which electrode impedance threshold must be met before beginning a PSG recording according to best practice?

Accepted Answer

Below 10 kΩ

Answer

Electrode impedance should be below 10 kΩ (ideally ≤5 kΩ) to ensure adequate signal quality.

Question 5

In digital PSG systems, what does the term 'common mode rejection ratio' (CMRR) refer to?

Accepted Answer

The ratio of differential signal gain to common-mode signal gain

Answer

CMRR measures the amplifier's ability to reject noise common to both inputs while amplifying only the differential (brain) signal.

RPSGT Exam Practice Test