Certified Polysomnographic Technician Certification Sleep Scoring & Staging Flashcards

What does an Apnea-Hypopnea Index (AHI) of 15–30 events per hour classify as?

Answer: Moderate OSA

An AHI of 15–30 events/hour is classified as moderate obstructive sleep apnea per AASM severity criteria.

Which EEG electrode placement corresponds to the left central region per the 10-20 system?

Answer: C3

C3 is the left central electrode in the 10-20 system and is a primary derivation for sleep stage scoring.

A leg movement scored during PSG must last at least how long to be counted?

Answer: 0.5 seconds

AASM criteria require a leg movement duration of 0.5 to 10 seconds to be scored as a periodic limb movement.

What is the AASM recommended minimum sampling rate for EEG channels in a digital PSG system?

Answer: 256 Hz

AASM recommends a minimum sampling rate of 256 Hz for EEG channels to accurately capture sleep-related waveforms.

During NREM sleep, which waveform appears as a high-amplitude biphasic waveform and can occur spontaneously or in response to stimuli?

Answer: K-complex

K-complexes are high-amplitude biphasic waveforms with a negative sharp deflection followed by a positive component, seen in N2 sleep.

Which parameter is used to calculate the Respiratory Disturbance Index (RDI)?

Answer: Apneas + hypopneas + RERAs

RDI includes apneas, hypopneas, AND respiratory effort-related arousals (RERAs) divided by total sleep time.