Frequency of bitemporal independent interictal epileptiform discharges in temporal lobe epilepsy

Erhan Ergene, Jerry J. Shih, David E. Blum, Norman K. So

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


Purpose: Bitemporal interictal epileptiform discharges (IEDs) occur in ≤42% of scalp EEGs in patients with temporal lobe epilepsy (TLE) studied with routine EEGs or partial analysis of long-term recordings. Methods: Twenty-eight patients with TLE demonstrating exclusively unilateral temporal IEDs on routine EEGs underwent 24-h continuous recording. The entire record was visually inspected for epileptiform discharges. We used continuous EEG to assess the significance of long-term recording in detecting bilateral IEDs. Results: Twenty-two patients had left temporal IEDs; 21 had right temporal IEDs. Seventeen (61%) patients had IEDs originating from both the right and left temporal lobes. The probability of detecting bilateral independent IEDs was correlated with the duration of continuous EEG recording. There was no correlation between the number of IEDs originating from one side and the probability of detecting independent IEDs on the other side. The frequencies of IEDs were not correlated with the length of time since onset of epilepsy. Conclusions: The findings suggest that when long-term recordings are performed, the incidence of bilateral discharges in TLE is higher than previously reported in the literature and supports the view that TLE is commonly a bilateral disease.

Original languageEnglish (US)
Pages (from-to)213-218
Number of pages6
Issue number2
StatePublished - 2000


  • Bitemporal
  • Epileptiform discharges
  • Temporal lobe epilepsy

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology


Dive into the research topics of 'Frequency of bitemporal independent interictal epileptiform discharges in temporal lobe epilepsy'. Together they form a unique fingerprint.

Cite this