Data Analysis & Reporting Flashcards

Which AASM-defined arousal criterion requires a minimum duration of EEG frequency shift?

Answer: 3 seconds

AASM rules require an EEG frequency shift lasting at least 3 seconds to qualify as an arousal.

During NREM sleep, a respiratory event with ≥30% reduction in airflow lasting ≥10 seconds associated with 3% oxygen desaturation should be scored as:

Answer: Hypopnea

A ≥30% airflow reduction ≥10 seconds with ≥3% desaturation meets AASM criteria for a hypopnea.

What is the recommended low-frequency filter setting for scoring EEG in polysomnography?

Answer: 0.3 Hz

AASM recommends a 0.3 Hz low-frequency filter for EEG channels to preserve slow-wave activity.

A patient's PSG shows an AHI of 18 events/hour with most events in REM sleep. What severity category does this represent?

Answer: Moderate OSA

An AHI of 15–30 events/hour is classified as moderate obstructive sleep apnea regardless of sleep stage distribution.

When scoring a split-night PSG, titration data should begin after how many hours of diagnostic recording according to AASM guidelines?

Answer: 2 hours

AASM guidelines recommend at least 2 hours of diagnostic recording before initiating CPAP titration on a split-night study.

Leg movements during sleep are considered periodic (PLMs) when they occur in groups of at least how many consecutive movements?

Answer: 4

AASM criteria require a minimum of 4 consecutive qualifying leg movements to score a PLM series.

What EEG characteristic distinguishes Stage N3 sleep from Stage N2 sleep?

Answer: High-amplitude slow waves occupying ≥20% of epoch

N3 is defined by slow-wave activity (≥75 µV, 0.5–2 Hz) occupying ≥20% of the scoring epoch.