Related Experiment Videos
An unusual case of rhythmic movement disorder
1Division of Neuropsychiatry, Ishikawa Prefectural Takamatsu Hospital, Japan. ai-y@wa2.so-net.ne.jp
Insights
Rhythmic movement disorder typically resolves in early childhood. This case highlights a rare instance of persistent rhythmic movement disorder until age 12, distinct from epileptic seizures.
Area of Science:
- Neurology
- Sleep Medicine
- Pediatric Neurology
Background:
- Rhythmic movement disorder (RMD) is classified as a sleep-wake transition disorder.
- It commonly affects infants and toddlers, usually resolving by age 4.
Observation:
- A rare case of RMD persisting until age 12 was observed.
- The patient exhibited characteristic rolling movements and electroencephalogram (EEG) spikes during sleep.
- Epileptic seizure was excluded due to movement type and symptom absence.
Findings:
- The persistent RMD was differentiated from epilepsy through clinical presentation and EEG.
- Characteristic rolling movements and sleep EEG spikes were noted in this prolonged RMD case.
- Cessation of symptoms upon blanket removal further supported the RMD diagnosis.
Implications:
- This case expands the known age range for Rhythmic Movement Disorder.
- It underscores the importance of careful differential diagnosis between RMD and nocturnal epilepsy in children.
- Further research may be needed to understand prolonged RMD and its management.
Abstract:
Rhythmic movement disorder is one of the sleep-wake transition disorders listed in the International Classification of Sleep Disorders. According to this classification, the condition commonly occurs in infants and toddlers, and persistence beyond 4 years of age is unusual. Recently, we encountered a case in which rhythmic movement disorder persisted up until the age of 12 years with spikes registering on the sleep electroencephalogram. Epileptic seizure was ruled out because of the characteristic rolling movement, absence of any other epileptic symptoms (e.g. vocalization and tonic-clonic seizure) and cessation as a result of removal of the blanket.