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Author Spotlight: Studying Clinical Characters and Epilepsy Outcomes After Frontal Disconnection in Patients with MOGHE
Published on: August 16, 2024
Nocturnal frontal lobe epilepsy in mucopolysaccharidosis
Paolo Bonanni1, Anna Volzone1, Giovanna Randazzo1
1Epilepsy and Clinical Neurophysiology Unit, IRCCS "E. Medea", Conegliano, TV, Italy.
Insights
Nocturnal frontal lobe epilepsy (NFLE) can occur in children with mucopolysaccharidosis (MPS), presenting as sleep disturbances. Periodic monitoring is recommended for early detection of these seizures in MPS patients.
Area of Science:
- Neurology
- Genetics
- Sleep Medicine
Background:
- Mucopolysaccharidosis (MPS) is a group of rare genetic disorders.
- Sleep disturbances are common in individuals with MPS.
- Nocturnal frontal lobe epilepsy (NFLE) is characterized by seizures during sleep.
Observation:
- Two children with MPS presented with significant sleep disturbances.
- Long-term video-EEG monitoring (LT-VEEGM) revealed sleep-related hypermotor seizures consistent with NFLE.
- This represents the first reported instance of NFLE in MPS patients.
Findings:
- The high frequency of frontal lobe seizures in MPS can lead to sleep fragmentation and disturbances.
- NFLE can occur in the context of lysosomal storage diseases like MPS.
- Differential diagnosis between NFLE and parasomnias is crucial in MPS patients with sleep issues.
Implications:
- Periodic LT-VEEGM is recommended for MPS patients, especially those with sleep disorders.
- These findings expand the known causes of NFLE.
- Highlights the importance of considering neurological comorbidities in rare genetic disorders.
Abstract:
Nocturnal frontal lobe epilepsy (NFLE) is an epileptic syndrome that is primarily characterized by seizures with motor signs occurring almost exclusively during sleep. We describe 2 children with mucopolysaccharidosis (MPS) who were referred for significant sleep disturbance. Long term video-EEG monitoring (LT-VEEGM) demonstrated sleep-related hypermotor seizures consistent with NFLE. No case of sleep-related hypermotor seizures has ever been reported to date in MPS. However, differential diagnosis with parasomnias has been previously discussed. The high frequency of frontal lobe seizures causes sleep fragmentation, which may result in sleep disturbances observed in at least a small percentage of MPS patients. We suggest monitoring individuals with MPS using periodic LT-VEEGM, particularly when sleep disorder is present. Moreover, our cases confirm that NFLE in lysosomal storage diseases may occur, and this finding extends the etiologic spectrum of NFLE.
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