RPSGT RPSGT Electroencephalography & Signal Interpretation 2

Question 1

The epoch length recommended by AASM for adult PSG sleep scoring is:

Accepted Answer

30 seconds

Answer

AASM guidelines specify 30-second epochs as the standard unit for adult polysomnographic sleep staging, retained from the original Rechtschaffen and Kales manual.

Question 2

Vertex sharp waves (V waves) are associated with which sleep stage?

Accepted Answer

N1 sleep

Answer

Vertex sharp waves are high-amplitude biphasic waveforms maximal at the central (Cz) electrode that appear during N1 sleep, often in response to external stimuli.

Question 3

An EEG arousal during PSG is scored when there is an abrupt EEG frequency shift lasting at least:

Accepted Answer

3 seconds

Answer

AASM defines an EEG arousal as an abrupt shift to alpha, theta, or >16 Hz activity lasting ≥3 seconds, preceded by ≥10 seconds of stable sleep.

Question 4

Positive occipital sharp transients of sleep (POSTS) are normal EEG variants that occur during which stages?

Accepted Answer

N1 and N2 sleep

Answer

POSTS are triangular, surface-positive sharp waves at occipital electrodes that are benign normal variants occurring during N1 and N2 NREM sleep.

Question 5

Mixed frequency low-amplitude EEG combined with low chin EMG tone defines which sleep stage?

Accepted Answer

REM

Answer

REM sleep is identified by mixed frequency low-amplitude EEG resembling wakefulness, combined with low chin EMG tone and often rapid eye movements.

RPSGT Exam Practice Test

RPSGT Exam Practice Test

RPSGT RPSGT Electroencephalography & Signal Interpretation 2