Spike frequency is dependent on epilepsy duration and seizure frequency in temporal lobe epilepsy

Jozsef Janszky, M. Hoppe, Z. Clemens, I. Janszky, C. Gyimesi, R. Schulz, A. Ebner

Research output: Contribution to journalArticle

26 Citations (Scopus)


Objectives. We wanted to investigate factors that are associated with frequency of interictal epileptiform discharges by investigating 303 patients with temporal lobe epilepsy (TLE). Methods. We included all patients who consecutively underwent the adult presurgical evaluation program at our center and who had intractable, medial TLE with complex partial seizures due to unilateral medial temporal lobe lesions. The interictal EEG samples were automatically recorded and stored on computer. The location and frequency of interictal epileptiform discharges were assessed by visual analysis of interictal EEG samples of 2-minute duration every hour. Results. There were 303 patients (aged 16-63) who met the inclusion criteria. The median interictal epileptiform discharge frequency was 15 IED/h, the median seizure frequency was 4 seizures/month. According to univariate analyses, we found that age at monitoring, epilepsy duration, and higher seizure frequency were associated with higher interictal epileptiform discharge frequency. In the logistic regression analysis, we found that higher seizure frequency (p < 0.001) and longer epilepsy duration (p = 0.007) were independently associated with higher spike frequency, while the age at monitoring was not. Conclusions. Seizure frequency and epilepsy duration (years of patient's life with seizure activity) were independently associated with IED frequency, suggesting that IED are modulated by seizures.

Original languageEnglish
Pages (from-to)355-359
Number of pages5
JournalEpileptic Disorders
Issue number4
Publication statusPublished - Dec 1 2005


  • EEG
  • Epilepsy duration
  • Interictal discharges
  • Seizure frequency
  • Temporal lobe epilepsy

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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