RPSGT RPSGT Sleep Staging & Scoring

Question 1

According to AASM scoring rules, what percentage of an epoch must consist of slow wave activity to score Stage N3?

Accepted Answer

≥20%

Answer

AASM rules require that ≥20% of the epoch consist of slow wave activity (0.5–2 Hz, >75 µV frontal) to score Stage N3.

Question 2

What is the typical frequency range for sleep spindles used when scoring Stage N2?

Accepted Answer

11–16 Hz

Answer

Sleep spindles are defined as 11–16 Hz (typically 12–14 Hz) waxing-and-waning activity lasting ≥0.5 seconds.

Question 3

What is the minimum duration a K-complex must meet to satisfy AASM scoring criteria?

Accepted Answer

0.5 seconds

Answer

AASM requires a K-complex to have a total duration of ≥0.5 seconds.

Question 4

According to AASM guidelines, which electrode region is used to measure slow wave activity for N3 scoring?

Accepted Answer

Frontal (F3/F4)

Answer

AASM specifies that slow wave activity amplitude and percentage are assessed over frontal derivations (F3 or F4).

Question 5

What is the standard epoch length used in polysomnography scoring per AASM guidelines?

Accepted Answer

30 seconds

Answer

The standard PSG epoch length is 30 seconds, established by Rechtschaffen & Kales and retained in AASM rules.

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