What is the role of the classic ictal EEG in the diagnosis of absence seizures?

Updated: May 30, 2019
  • Author: David Y Ko, MD; Chief Editor: Selim R Benbadis, MD  more...
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The classic ictal EEG correlate of absence seizures consists of 3-Hz generalized spike-and–slow wave complexes that may be induced by activation during EEG by hyperventilation and sometimes photic stimulation. EEG abnormalities may persist into adulthood despite the absence of clinical seizures. However, compared with the EEG discharges in children, those in adults occur less often, are less well formed, and are of lesser amplitude.

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