FREE BRPT AASM Scoring of Sleep Stages and Arousals Questions and Answers

Question 1

According to AASM guidelines, an epoch is scored as Stage N2 sleep upon the first occurrence of which of the following?

Accepted Answer

A K-complex or a sleep spindle.

Answer

Low-amplitude, mixed-frequency EEG activity for more than 50% of the epoch.

Answer

Slow wave activity comprising 20% of the epoch.

Answer

An EEG arousal.

Question 2

To score a 30-second epoch as Stage N3, what percentage of the epoch must contain slow wave activity?

Accepted Answer

20% or more

Answer

Greater than 50%

Answer

At least 75%

Answer

Less than 10%

Question 3

Which combination of features is required to score an epoch as Stage R (REM) sleep?

Accepted Answer

Low-amplitude mixed-frequency EEG, low chin EMG, and rapid eye movements.

Answer

High-amplitude slow waves, high chin EMG, and no eye movements.

Answer

Sleep spindles, low chin EMG, and slow rolling eye movements.

Answer

Vertex sharp waves, high chin EMG, and rapid eye movements.

Question 4

What is the minimum duration for an abrupt shift in EEG frequency to be scored as an arousal during NREM sleep?

Accepted Answer

3 seconds

Answer

1.5 seconds

Answer

10 seconds

Answer

0.5 seconds

Question 5

When scoring an arousal during Stage R sleep, what additional criterion must be met besides the 3-second EEG frequency shift?

Accepted Answer

A concurrent increase in submental EMG for at least 1 second.

Answer

A concurrent oxygen desaturation of at least 3%.

Answer

A concurrent leg movement.

Answer

No additional criteria are needed.

Question 6

A 30-second epoch contains a single sleep spindle but is otherwise composed of low-amplitude, mixed-frequency activity consistent with Stage N1. How should this epoch be scored?

Accepted Answer

Stage N2

Answer

Stage W (Wake)

Answer

Stage N1

Answer

Stage N3