RPSGT RPSGT Sleep Staging & Scoring 2

Question 1

What distinguishes Stage N1 from Stage Wake in a subject who generates occipital alpha rhythm?

Accepted Answer

Alpha activity present for <50% of the epoch

Answer

Presence of K-complexes

Answer

Presence of sleep spindles

Answer

Absence of chin EMG activity

Question 2

Sawtooth waves during polysomnography are most commonly associated with which sleep stage?

Accepted Answer

REM

Answer

N1

Answer

N2

Answer

N3

Question 3

An EEG frequency shift qualifies as an arousal in AASM scoring if it lasts a minimum of how many seconds?

Accepted Answer

3 seconds

Answer

1 second

Answer

5 seconds

Answer

10 seconds

Question 4

Which of the following correctly states the amplitude criterion for slow wave activity in N3 scoring?

Accepted Answer

Peak-to-peak >75 µV in frontal leads

Answer

Peak-to-peak >50 µV in occipital leads

Answer

Peak-to-peak >100 µV in central leads

Answer

Peak-to-peak >150 µV in temporal leads

Question 5

What frequency range defines the theta activity that predominates in Stage N1 sleep?

Accepted Answer

4–7 Hz

Answer

0.5–2 Hz

Answer

8–12 Hz

Answer

13–30 Hz

Question 6

In subjects who do not generate occipital alpha activity, which criterion is used to distinguish Stage Wake from Stage N1?

Accepted Answer

Presence of irregular conjugate eye movements and/or eye blinks

Answer

Presence of sleep spindles

Answer

Eye blink rate exceeding 3 per minute

Answer

Chin EMG amplitude exceeding a set threshold

Question 7

How is a sleep cycle most accurately defined in standard PSG scoring?

Accepted Answer

One NREM period followed by one REM period

Answer

90 minutes of consecutive sleep

Answer

A period from sleep onset to the first arousal

Answer

A period from N1 onset to the next Stage Wake