What are the features of complex focal seizures on EEG?

Updated: May 30, 2019
  • Author: David Y Ko, MD; Chief Editor: Selim R Benbadis, MD  more...
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Answer

The great majority of complex focal seizures have an ictal correlate on the EEG. A normal alpha rhythm during behavioral impairment of consciousness is highly suggestive of nonepileptic seizures, but this should be interpreted by an experienced epileptologist, as some true seizures may not have surface EEG changes, and some true seizures can have somewhat atypical features (eg, bilateral motor activity is present, but the patient may be conscious from supplementary motor seizures).


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