RPSGT RPSGT Sleep Staging & Scoring 3

Question 1

What is the minimum preceding sleep duration required before an EEG frequency shift can be scored as an arousal per AASM rules?

Accepted Answer

10 seconds

Answer

5 seconds

Answer

15 seconds

Answer

30 seconds

Question 2

Vertex sharp waves are most characteristic of which sleep stage?

Accepted Answer

N1

Answer

N2

Answer

N3

Answer

REM

Question 3

According to AASM guidelines, which combination of features is required to score an epoch as Stage REM?

Accepted Answer

Low-amplitude mixed-frequency EEG + rapid eye movements + low chin EMG

Answer

Alpha EEG + rapid eye movements + high chin EMG

Answer

Sleep spindles + rapid eye movements + low chin EMG

Answer

Slow wave activity + sawtooth waves + low chin EMG

Question 4

When should an epoch be scored Stage N3 rather than N2 even if sleep spindles are present?

Accepted Answer

When ≥20% of the epoch consists of slow wave activity

Answer

When K-complexes are absent from the epoch

Answer

When the patient is having central apneas

Answer

When chin EMG atonia is detected

Question 5

If N2 features appear early in an epoch and are followed by an arousal that does not reach Wake criteria, how is the epoch scored?

Accepted Answer

Score as N2 because N2 features were present

Answer

Score as N1 because the arousal disrupted N2

Answer

Score the first half N2 and the second half N1

Answer

Score as Wake because of the arousal

Question 6

What is the frequency range of slow wave activity (delta waves) as defined by the AASM Scoring Manual for N3 scoring?

Accepted Answer

0.5–2 Hz

Answer

2–4 Hz

Answer

4–6 Hz

Answer

6–8 Hz

Question 7

Which AASM scoring rule applies when an epoch contains only a single sleep spindle and no other N2 features but otherwise resembles N1?

Accepted Answer

Score as N2 because a single spindle meets N2 criteria

Answer

Score as N1 because insufficient N2 features are present

Answer

Score as N3 if the spindle exceeds 1 second in duration

Answer

Score as REM if chin EMG is low