The Grey Zone in Multiple Sleep Latency Test for Diagnosis of Narcolepsy: A Survey of Korean Neurologist

Objectives: Clinicians often depend on the results of the the multiple sleep latency test (MSLT) for diagnosing narcolepsy, but the diagnosis can be confusing when there is a co-existence of obstructive sleep apnea (OSA). This study is aimed to address the diagnostic tendency and the strategies of treatment for narcolepsy and other hypersomnia in the grey zone.Methods: We performed a web-based survey of Korean neurologists who were interested in narcolepsy and had experience with sleep studies.Results: The results of this survey present their concerns according to the severity of comorbid OSA in analyzing the results of the MSLT.Conclusions: This study also might help by providing the opinions of experienced Korean neurologists for the assessment and management of excessive daytime sleepiness.