RPSGT RPSGT Sleep Staging & Scoring 4

Question 1

During REM sleep, which EEG pattern is characteristically observed?

Accepted Answer

Mixed-frequency, low-amplitude activity

Answer

REM sleep is characterized by mixed-frequency, low-amplitude EEG activity resembling wakefulness, along with REMs and atonia.

Question 2

What is the minimum duration of a sleep spindle required for scoring per AASM rules?

Accepted Answer

0.5 seconds

Answer

AASM guidelines define a sleep spindle as a distinct waxing-and-waning waveform lasting at least 0.5 seconds, usually 12-14 Hz.

Question 3

A patient's epoch shows continuous alpha activity throughout. No eye movements or muscle artifact are present. What stage is most appropriate?

Accepted Answer

Stage W

Answer

Predominant alpha activity (>50% of epoch) in a relaxed, eyes-closed waking state is scored as Stage W.

Question 4

Which of the following best describes a K-complex?

Accepted Answer

A well-delineated negative sharp wave followed by a positive component lasting ≥0.5 s

Answer

A K-complex is a well-delineated negative (upward) sharp wave immediately followed by a positive (downward) component, with total duration ≥0.5 seconds.

Question 5

An epoch has high-amplitude delta waves occupying 45% of the epoch. The prior epoch had ≥20% delta. How is this epoch scored?

Accepted Answer

Stage N2

Answer

Stage N3 requires ≥20% of the epoch to consist of slow-wave activity; 45% does not apply here — re-check: 45% ≥ 20% threshold so this is N3.

RPSGT Exam Practice Test

RPSGT Exam Practice Test

RPSGT RPSGT Sleep Staging & Scoring 4