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REM Sleep Behavior Disorder01:15

REM Sleep Behavior Disorder

REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
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NREM Sleep
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Acquired cognitive dysfunction with focal sleep spiking activity.

Philippe F Paquier1, Denis Verheulpen, Xavier De Tiège

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Continuous spike-wave during slow sleep (CSWS) can present focally, not just diffusely. Unilateral CSWS in epilepsy correlated with specific neurological deficits, improving with treatment.

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Area of Science:

  • Neurology
  • Neurophysiology
  • Epileptology

Background:

  • Continuous spike-wave during slow sleep (CSWS) is an epileptic encephalopathy often linked to cognitive decline.
  • Its characteristic EEG pattern is typically diffuse and bilateral during non-REM sleep.

Purpose of the Study:

  • To investigate clinical and EEG findings in patients with non-symptomatic epilepsy and unilateral CSWS.
  • To explore the relationship between focal CSWS activity and neuropsychological deficits.

Main Methods:

  • Case study design.
  • Clinical, neuropsychological, electroencephalographic (EEG), and 18F-fluorodeoxyglucose positron emission tomography (PET-FDG) assessments.
  • Analysis of two patients with unilateral CSWS and motor neglect.

Main Results:

  • Both patients exhibited left unilateral motor neglect associated with right hemisphere unilateral CSWS, primarily centrotemporal.
  • PET-FDG showed right centrotemporal hypermetabolism during active CSWS.
  • Treatment led to CSWS regression, improved FDG patterns, and remission of motor neglect.

Conclusions:

  • CSWS in non-symptomatic epilepsy can be focal and unilateral, not exclusively diffuse.
  • Focal unilateral CSWS activity correlates with focal neuropsychological deficits.
  • These findings expand the understanding of CSWS spectrum and acquired cognitive disturbances.