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Diagnosing rhythmic movement disorder with video-polysomnography
M E Dyken1, D C Lin-Dyken, T Yamada
1Department of Neurology, University of Iowa College of Medicine, Iowa City 52242, USA.
Insights
Accurate clinical and electrophysiologic assessment aids in diagnosing rhythmic movement disorder in children. Video-polysomnography during sleep reveals characteristic movements linked to specific sleep stages.
Area of Science:
- Neurology
- Sleep Medicine
- Pediatrics
Background:
- Rhythmic movement disorder involves unusual nocturnal behaviors.
- Differential diagnoses include seizures and other parasomnias.
- Accurate diagnosis is crucial for appropriate management.
Purpose of the Study:
- To evaluate the utility of clinical and electrophysiologic characterization in diagnosing rhythmic movement disorder.
- To differentiate rhythmic movement disorder from other nocturnal movement disorders.
Main Methods:
- Seven children (age 1-12) with nocturnal behaviors underwent split-screen video-polysomnography.
- Clinical assessment and electrophysiologic sleep staging were performed during movement episodes.
- Movements were characterized, and patient responsiveness/amnesia were assessed.
Main Results:
- Thirty-seven episodes of headbanging, body rocking, and leg banging were observed.
- These movements were strongly associated with stage 2 non-rapid eye movement sleep and K-complexes.
- Patients were unresponsive during and amnesic for the events.
Conclusions:
- Accurate clinical and electrophysiologic characterization is vital for diagnosing rhythmic movement disorder.
- Video-polysomnography is essential for differentiating it from other disorders with similar nocturnal movements.
- Diagnosis is enhanced by documenting movements during sleep studies.
Abstract:
We evaluated the utility of accurate clinical and electrophysiologic characterization in the diagnosis of the rhythmic movement disorder. Seven children with an age range of 1-12 years, referred for evaluation of relatively violent nocturnal behaviors, were clinically assessed during split-screen, video-polysomnographic monitoring sessions, as they experienced unusual nocturnus movements. Differential diagnoses included self-injurious waking behaviors, seizures, and parasomnias such as somnambulism (sleepwalking), pavor nocturnus (night terrors), and the rhythmic movement disorder (headbanging, bodyrocking, and legbanging). The character of movements, level of responsiveness, and electrophysiologic stage of sleep was determined during typical spells. In all the subjects experienced 37 periods of headbanging, bodyrocking, and legbanging that were strongly associated with stage 2 non-rapid eye movement sleep and K-complexes. The patients were unresponsive during and amnestic for the events. Because the differential for the rhythmic movement disorder includes a large number of disorders associated with abnormal and at times violent nocturnal movements, diagnosis can be greatly enhanced by documenting suspected nocturnal behaviors with thorough clinical assessment during split-screen, video-polysomnographic analysis.