What are subclinical rhythmic EEG discharges in adults?

Updated: Oct 09, 2019
  • Author: Roy Sucholeiki, MD; Chief Editor: Selim R Benbadis, MD  more...
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Subclinical rhythmic EEG discharges in adults

  • The typical pattern of subclinical rhythmic EEG discharges in adults (SREDA) consists of theta rhythm occurring in a widespread manner, maximal over the parietal and posterior temporal regions, and lasting for a few seconds to a minute without clinical signs or symptoms. It is described as "not evolving" and appears quite stable for its duration.

  • Another unusual variant is made up of predominantly delta frequencies as well as notched waveforms with a frontal distribution and a more prolonged duration that even includes sleep.

  • No significant clinical differences have been found between groups that had the atypical pattern and those with the typical pattern.

  • Although the mechanism of SREDA is not understood, it appears to represent a benign EEG phenomenon that should be distinguished from seizure discharges. [7]

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