How are low frequency discharge patterns identified in the visual analysis of neonatal electroencephalogram (EEG)?

Updated: Aug 20, 2019
  • Author: Samuel Koszer, MD; Chief Editor: Selim R Benbadis, MD  more...
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Low-frequency discharge patterns

  • Low-frequency discharge patterns are stereotyped, repetitive, rhythmic, or quasi-rhythmic paroxysmal discharges consisting of sharp, broad-based waves that occur at low frequencies (around 0.5-1 Hz). These discharges may involve focal or multifocal areas or involve an entire hemisphere. This pattern is similar to the periodic lateralized epileptiform discharges (PLEDs) seen in older children.

  • To fit the definition of PLEDS, these discharges cannot exhibit evolution in morphology, frequency, or field and cannot be associated with ictal manifestations. Almost invariably, these discharges occur in the context of abnormal backgrounds, usually of invariant, inactive, or low-voltage patterns.

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