What are myoclonic seizures?

Updated: May 30, 2019
  • Author: David Y Ko, MD; Chief Editor: Selim R Benbadis, MD  more...
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Myoclonic seizures consist of brief arrhythmic jerking motor movements that last less than 1 second and often cluster within a few minutes. If the seizures evolve into rhythmic jerking movements, they are classified as evolving into a clonic seizure. Myoclonus is not always epileptic in origin. For example, the myoclonic jerks during phase I of sleep are normal release phenomena. The classic ictal correlate of myoclonic seizures on the EEG consists of fast polyspike-and–slow wave complexes.

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