Juvenile Myoclonic Epilepsy

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  • Juvenile myoclonic epilepsy also known as JME or Janz syndrome
  • Most common generalized epilepsy syndromes in adolescents
  • 1 in 1000 children
  • Seizures start between 5 and 16 years old
  • Sleep deprivation and stress are two very common triggers of myoclonic jerks and tonic clonic seizures.
  • Sometimes triggered by flickering light


  • Typically myoclonic jerks that occur after sleep.
  • Sometimes the myoclonic jerks are only in the fingers causing the patient dropping things.
  • During the myoclonic jerks the patients are normally awake.
  • Most of the patients have generalized tonic-clonic seizures
  • Absence seizures in around 30-40% of the patients


Generalized (poly)spike slow wave in a 15 year old male with JME (source)

Juvenile myoclonic epilepsy in a 15 year old male (source) EEGpedia.png