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Etomidate activates epileptic high frequency oscillations.

S Rampp1, H J Schmitt2, M Heers3

  • 1Epilepsy Center, Department of Neurology, University Hospital Erlangen, Erlangen, Germany.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|August 6, 2013
PubMed
Summary
This summary is machine-generated.

Etomidate, an anesthetic, effectively provokes epileptic spikes and high-frequency oscillations (HFOs) in patients undergoing epilepsy monitoring. This activation is safe and helps identify the seizure onset zone (SOZ).

Keywords:
ActivationEpilepsyEtomidateHigh frequency oscillationsPresurgical workup

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Area of Science:

  • Neuroscience
  • Epileptology
  • Anesthesiology

Background:

  • Etomidate is a short-acting anesthetic known to induce epileptic spikes and seizures.
  • The effect of etomidate on high-frequency oscillations (HFOs), a potential biomarker for epileptogenicity, remains uninvestigated.
  • Understanding etomidate's influence on HFOs could validate its use in presurgical epilepsy evaluation and elucidate mechanisms of epileptic activity generation.

Purpose of the Study:

  • To investigate the effect of etomidate administration on the occurrence of epileptic spikes and HFOs.
  • To determine if etomidate-induced HFOs and spikes can help identify the seizure onset zone (SOZ).
  • To assess the safety and utility of etomidate as a provocation measure in invasive EEG monitoring.

Main Methods:

  • Retrospective analysis of invasive video-EEG monitoring data from four patients who received etomidate.
  • Subdural strip electrodes were used for EEG recording.
  • Spikes were manually identified in raw EEG data, and HFOs (80-250Hz) were identified in filtered data. Rates and spatial distributions were compared before and after etomidate administration, during sleep, and while awake.

Main Results:

  • Etomidate administration significantly increased the rates of both spikes (from ~10/min to 61.4/min) and HFOs (from ~9/min to 24.4/min) (p<0.001).
  • The spatial distribution of etomidate-induced spikes and HFOs was consistent with the seizure onset zone (SOZ) and/or the resection area in most patients.
  • No new foci of spikes or HFOs were observed beyond those present without etomidate activation.

Conclusions:

  • Etomidate administration is a safe and effective method to provoke epileptic spikes and HFOs during invasive EEG monitoring.
  • The spatial localization of etomidate-induced HFOs and spikes aligns with the epileptic network, particularly the SOZ.
  • Etomidate-induced HFOs demonstrate high specificity for the SOZ, supporting its role as a valuable provocation tool in epilepsy presurgical evaluation.