What are focal interictal epileptiform discharges (IEDs) on EEG?

Updated: Oct 09, 2019
  • Author: Alexis D Boro, MD; Chief Editor: Selim R Benbadis, MD  more...
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Focal interictal epileptiform discharges (IEDs) are sharply contoured transients that are distinct from and usually interrupt background activities. IEDs are almost always of negative polarity at the scalp surface. IEDs usually occur sporadically. When they occur periodically or nearly so, they are referred to as pseudoperiodic epileptic discharges. IEDs are discussed in detail in Epileptiform Discharges. Some of their clinical implications are briefly reviewed here.

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