Polysomnography

Polysomnography (PSG) is a comprehensive sleep study that involves monitoring various physiological parameters during sleep to evaluate sleep architecture, identify sleep disorders, and assess overall sleep quality. Here is an overview of polysomnography and its key components:

1. Definition and Purpose:

oPolysomnography is a diagnostic test that records multiple physiological variables during sleep, including brain activity (EEG), eye movements (EOG), muscle activity (EMG), heart rhythm (ECG), and respiratory parameters.

oThe primary purpose of polysomnography is to assess sleep patterns, stages of sleep, and detect abnormalities such as sleep apnea, periodic limb movements, parasomnias, and other sleep disorders.

2. Sleep Architecture:

oSleep architecture refers to the organization and distribution of sleep stages throughout the night. Polysomnography allows for the detailed analysis of sleep architecture by monitoring EEG, EOG, and EMG activity.

oSleep is divided into non-rapid eye movement (NREM) and rapid eye movement (REM) stages, each characterized by specific EEG patterns and physiological changes.

3. Key Terminology:

oLights out: The start of the polysomnogram recording when the patient goes to bed.

oLights on: The end of the polysomnogram recording when the patient wakes up.

oTIB (Time in Bed): Total time the patient spends in bed during the sleep study, including periods of wakefulness.

oTST (Total Sleep Time): Total time the patient spends in any stage of sleep while in bed.

oSleep Efficiency: The ratio of total sleep time to time in bed, expressed as a percentage.

o WASO (Wakefulness After Sleep Onset): Time spent awake after the first epoch of sleep and before final awakening.

oSleep Latency: Time from lights out to the onset of the first sleep stage.

oREM Latency: Time from the onset of the first sleep stage to the first epoch of REM sleep.

o% Stages I, II, III, IV, REM: Percentage of time spent in each sleep stage relative to total sleep time.

4. Sleep Cycles and Monitoring:

oPolysomnography allows for the assessment of sleep cycles, which typically consist of alternating NREM and REM stages throughout the night.

o Monitoring parameters such as EEG, EOG, EMG, respiratory function, and cardiac activity during polysomnography provides a comprehensive evaluation of sleep architecture, respiratory events, and nocturnal behaviors.

5. Clinical Applications:

oPolysomnography is commonly used in the diagnosis and management of sleep disorders such as obstructive sleep apnea, insomnia, narcolepsy, and parasomnias.

o Multiple sleep latency testing (MSLT) and maintenance of wakefulness testing (MWT) are additional techniques that can be performed in conjunction with polysomnography to assess daytime sleepiness and vigilance.

In summary, polysomnography is a valuable tool for evaluating sleep patterns, diagnosing sleep disorders, and monitoring physiological parameters during sleep. By providing detailed information on sleep architecture and abnormalities, polysomnography plays a crucial role in the assessment and management of various sleep-related conditions.

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