Orientation to Polysomnography

Understanding the PSG Interface00:00:00

Introduction to the standard three-panel interface used for sleep studies, including the hypnogram for sleep architecture, the 30-second epoch sleep staging panel, and the longer time-scale panel for respiratory and limb movement events.

Sleep Staging: EEG, EOG, and EMG00:04:11

Overview of the 10-20 system for EEG recording, the 'DITAB' mnemonic for identifying brain wave frequencies (Delta, Theta, Alpha, Beta), and how EOG leads track eye movements using dipole charges.

Identifying Sleep Stages00:13:57

A detailed look at identifying Wake, N1 (drowsiness), N2 (spindles and K-complexes), N3 (slow-wave/delta), and REM sleep, emphasizing the role of muscle tone and specific waveforms in accurate staging.

Arousals and Respiratory Scoring00:19:20

Explanation of scoring arousals, followed by a breakdown of respiratory equipment (nasal cannula and thermistor) to identify apneas and hypopneas, and the importance of checking effort channels to distinguish between obstructive and central events.

Limb Movement Scoring00:27:37

Introduction to detecting periodic limb movements using EMG electrodes on the anterior tibialis and the role of concurrent video monitoring to confirm movement and exclude artifacts.