Periodic limb movements during REM sleep in multiple sclerosis: a previously undescribed entity

Area of Science:

• Neurology
• Sleep Medicine
• Clinical Research

Background:

• Periodic limb movements in sleep (PLMS) are documented in various conditions but not previously in multiple sclerosis (MS).
• Investigating PLMS in REM sleep in MS patients is crucial for understanding sleep disturbances in this population.

Purpose of the Study:

• To investigate the presence of periodic limb movements (PLMs) during REM sleep in patients with multiple sclerosis (MS).
• To determine if PLMS in REM sleep is associated with patient age, sex, disability level, or specific laboratory findings.

Main Methods:

• Retrospective analysis of polysomnography data from MS patients.
• Classification of patients into two groups based on PLMs per hour of REM sleep (≥10 vs. <10).
• Univariate analysis to assess correlations between PLMS and clinical/polysomnographic variables, including the Expanded Disability Status Scale (EDSS).

Main Results:

• MS patients with ≥10 PLMs per hour of REM sleep exhibited significantly higher disability scores (EDSS).
• The presence of ≥10 PLMs per hour of REM sleep was strongly associated with increased likelihood of disability (OR 22.1).
• No significant differences were found in laboratory or other polysomnographic findings between the groups.

Conclusions:

• Periodic limb movements during REM sleep (PLMS) are identified in multiple sclerosis (MS) patients for the first time.
• PLMS in REM sleep are significantly associated with greater disability in MS patients, as indicated by EDSS scores.