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Updated: Aug 10 2021

Absence (Petit Mal)

  • Snapshot
    • A 6-year-old boy is brought to the pediatrician by his parent’s due to episodes of “staring into space.” This occurs several times a day and lasts only a few seconds. During these episodes, the boy is unresponsive to the parents and does not fall down or shake. After the episode, the boy returns to his normal activity and is not confused. The parent’s deny any history of head trauma, medications, or infection. Neurological exam is normal. An EEG is performed, which shows 3-Hz spike and wave form.
  • Introduction
    • Generalized epilepsy syndrome
      • in an otherwise healthy child
      • leads to loss of conciousness without losing muscle tone
        • no postictal confusion
      • eletroencephalogram (EEG) shows
        • 3-Hz spike waves
      • can have many seizure episodes per day
    • Precipitating factors include
      • hyperventilation
      • emotions (e.g., anger, fear)
  • Epidemiology
    • Most commonly seen in children ages 4 - 12
    • Family history is a likely risk factor
  • Presentation
    • Symptoms
      • periods of impaired consciousness
        • behavioral arrest, unresponsive
        • after seizure event, patients return to activity
        • short (~4 - 20 seconds long)
      • may have automatisms, tonic-clonic, or myoclonus
        • myoclonus may involve the eyelids
  • Evaluation
    • EEG
      • 3-Hz spike and wave discharge
  • Differential
    • Juvenile myoclonic epilepsy
      • recurrent spasms shortly after waking or when sleep-deprived
    • Lennox-Gastaut syndrome
    • Attention-deficit hyperactive disorder (ADHD)
    • Day dreaming
  • Treatment
    • Medications
      • ethosuximide
        • first-line
      • valproate
        • also effective initial therapy
        • may be first-line in concomitant generalized clonic-tonic seizures
      • lamotrigine
        • not as effective as ethosuximide or valproate
  • Complications
    • May have impairments in neuropsychological or cognitive development
      • most are neurologically and intellectually fine
  • Prognosis
    • May be self-limiting
      • however, there is variable seizure outcome
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