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Right hemihypsarrhythmia (EEG)

The asterisk marks a spasm during light slow sleep, with brief tonic discharge of the left deltoid muscle. Sleep spindles are evident on the left hemisphere before the spasm occurs. (Contributed by Dr. Tiziana Granata.)

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Associated Disorders

  • Absence of septum pellucidum
  • Cerebral palsy
  • Congenital infection
  • Epilepsy
  • Infantile spasms
  • Intracranial hemorrhage
  • Ischemic necrosis
  • Mental retardation
  • Periventricular hemorrhagic infarction
  • Polymicrogyria
  • Prematurity
  • West syndrome