MSLT
MSLT (pronounced em-es-el-tee), also known as the Multiple Sleep Latency Test, is a sleep disorder diagnostic tool.
Pronunciation
The term MSLT is pronounced as "em-es-el-tee".
Etymology
The term MSLT is an acronym derived from the words Multiple Sleep Latency Test.
Definition
The Multiple Sleep Latency Test (MSLT) is a sleep study used to measure the speed at which a person falls asleep during the day. It is used to diagnose narcolepsy and idiopathic hypersomnia, two conditions characterized by excessive daytime sleepiness.
Procedure
The MSLT is performed after a full night's polysomnography (PSG). The patient is asked to take five scheduled naps, each separated by two hours. The time it takes for the patient to fall asleep is measured in each nap. The average sleep latency (time to fall asleep) across the five naps is calculated to give the MSLT score.
Interpretation
A mean sleep latency of less than 8 minutes on the MSLT is considered abnormal and suggestive of a hypersomnia disorder. The presence of two or more sleep onset REM periods (SOREMPs) during the MSLT is suggestive of narcolepsy.
Related Terms
- Polysomnography (PSG)
- Narcolepsy
- Idiopathic hypersomnia
- Hypersomnia
- Sleep onset REM periods (SOREMPs)
External links
- Medical encyclopedia article on MSLT
- Wikipedia's article - MSLT
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