Sleep Study Terms

 

AHI (apnea-hypopnea index):

measurement of overall severity of sleep apnea.

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Apnea:

a pause in breathing during sleep that lasts at least 10 seconds.

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Central sleep apnea:

Sleep disorder that occurs when the brain briefly fails to tell the heart and lungs to breathe. It is unrelated to obstructive sleep apnea.

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Hypopnea:

a partial reduction in breathing of at least 30% that lasts at least 10 seconds during sleep—associated with a drop in oxygen levels.

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PAP:

Positive airway pressure. Most common and effective treatment for obstructive sleep apnea. It provides a stream of air through a mask that you wear during sleep. The air keeps airway open and prevents pauses in breathing and restores normal blood oxygen saturation.

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Polysomnogram (PSG):

standard method of detecting sleep disorders and evaluating treatment in children and adults. As you sleep, electrodes and sensors collect information such as airflow, brain activity, respiratory effort, eye movement, leg movement, blood oxygen saturation level, and unusual behavior.

 

Respiratory effort:

breathing effort, measured by movements of the chest and stomach.

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Sleep latency:

length of time from when the lights are turned out to sleep onset

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Sleep onset:

the moment when you fall asleep

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Sleep stages:

four unique periods that make up one sleep cycle. The nature of your sleep is different in each stage. Mainly consisting of Non-REM and REM sleep. Non-REM sleep consists of light sleep, stage 2, deep sleep.

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Sleep technologist:

a health care professional who assists in the evaluation and follow up care of patients with sleep disorders.

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Split-night study:

Doing an overnight sleep study and a CPAP study in the same night. This may occur if you are showing signs of severe obstructive sleep apnea.

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Titration:

The process of setting the air-pressure level of a PAP device so that it eliminates episodes of apnea and hypopnea. A sleep technologist raises and lowers the air pressure to find the best setting for you.

CPAP RELATED TERMS

APAP (Auto CPAP):

auto-titrating positive-airway pressure. PAP machine with a self-adjusting mode that raises and lowers pressure as needed

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BPAP:

bi-level positive airway pressure: provides 2 levels of air pressure; a higher level during inhalation and lower level during exhalation.

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CPAP:

continuous positive airway pressure. Provides one fixed level of air pressure.

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PAP:

Positive airway pressure. Most common and effective treatment for obstructive sleep apnea. It provides a stream of air through a mask that you wear during sleep. The air keeps airway open and prevents pauses in breathing and restores normal blood oxygen saturation.