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Rhythmic movement disorder: polysomnographic study and summary of reported cases
Jun Kohyama1, Fumie Matsukura, Kaku Kimura
1Human Ontogeny and Childhood Development, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Tokyo 113-8519, Japan. jkohyama.ped@tmd.ac.jp
Brain & Development
|December 26, 2001
Summary
Rhythmic movement disorder (RMD) can occur during all sleep stages, including REM sleep. This suggests RMD may have multiple underlying causes, requiring further investigation into distinct patient subgroups.
Area of Science:
- Neurology
- Sleep Medicine
- Movement Disorders
Background:
- Rhythmic movement disorder (RMD) is typically classified as a sleep-wake transition disorder.
- However, RMD episodes have been observed during rapid-eye-movement (REM) sleep, a stage characterized by muscle atonia.
Observation:
- This study investigated RMD in two children using polysomnography.
- Rhythmic movements were observed across all sleep stages, including REM sleep, in both patients.
- Analysis of polysomnographic reports from 33 RMD patients revealed varied occurrences during REM sleep.
Findings:
- While RMD can occur during REM sleep, it is not exclusive to this stage.
- Some RMD patients experience episodes solely during REM sleep, while others do not.
- Normal REM sleep atonia indices and gross movement patterns were observed in the studied patients.
Implications:
- The findings suggest RMD may comprise distinct subgroups with different underlying neurobiological mechanisms.
- Further research is needed to differentiate these subgroups based on sleep stage involvement and underlying pathophysiology.
- This could lead to more targeted diagnostic and therapeutic approaches for RMD patients.