How are neonatal seizures classified?

Updated: Jul 31, 2019
  • Author: Raj D Sheth, MD; Chief Editor: Stephen L Nelson, Jr, MD, PhD, FAACPDM, FAAN, FAAP  more...
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Answer

Clonic seizures

These movements most commonly are associated with electrographic seizures. They often involve 1 extremity or 1 side of the body. The rhythm of the clonic movements is usually slow, at 1-3 movements per second.

Tonic seizures

These may involve 1 extremity or the whole body. Focal tonic seizures involving 1 extremity often are associated with electrographic seizures.

Generalized tonic seizures often manifest with tonic extension of the upper and lower limbs and also may involve the axial musculature in an opisthotonic fashion. Generalized tonic seizures mimic decorticate posturing; the majority are not associated with electrographic seizures. 

Myoclonic seizures

These may occur focally in 1 extremity or in several body parts (in which case they are described as multifocal myoclonic seizures).

Focal and multifocal myoclonic seizures typically are not associated with electrographic correlates.  These movements are thought to be non-epileptic in nature and a reflection of severe encephalopathy.  


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