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Related Experiment Videos

Multiple electrodes for detecting spikes in partial complex seizures.

R M Sadler1, J Goodwin

  • 1Department of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada.

The Canadian Journal of Neurological Sciences. Le Journal Canadien Des Sciences Neurologiques
|August 1, 1989
PubMed
Summary
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For anterior temporal lobe epilepsy, sphenoidal (SP) electrodes detect the highest amplitude spikes. Non-invasive mandibular notch surface (MNS) or anterior temporal (T1-2) electrodes are recommended for outpatient EEG, detecting nearly all spikes.

Area of Science:

  • Neurology
  • Neurophysiology
  • Epileptology

Background:

  • Accurate detection of epileptic spikes is crucial for diagnosing seizures.
  • Anterior temporal lobe epilepsy presents diagnostic challenges.
  • Evaluating the efficacy of different electroencephalographic (EEG) electrode placements is essential.

Purpose of the Study:

  • To compare the effectiveness of various EEG electrodes in detecting spikes from patients with suspected anterior temporal lobe seizures.
  • To identify optimal electrode configurations for improved spike detection.

Main Methods:

  • Prospective study using a standard protocol.
  • Evaluation of International Standard 10-20 positions (F7-8, A1-2), sphenoidal (SP), nasopharyngeal (NP), anterior temporal (T1-2), mandibular notch surface (MNS), and mandibular notch subdermal (MNSD) electrodes.

Related Experiment Videos

  • Analysis of spike detection rates and amplitudes in 20 patients with suspected anterior temporal origin seizures.

    • Main Results:

    • Sphenoidal (SP), MNS, MNSD, and T1-2 electrodes detected significantly more spikes than NP, F7-8, or A1-2 electrodes.
    • SP electrodes recorded spikes of the highest amplitude.
    • No significant difference in spike detection was found between SP, MNS, MNSD, and T1-2 electrodes.

    Conclusions:

    • Relying solely on the International Standard 10-20 system may lead to missed anterior temporal lobe epilepsy spikes.
    • Non-invasive MNS or T1-2 electrodes are effective alternatives to SP electrodes for outpatient EEG, detecting most spikes.
    • Nasopharyngeal (NP) electrodes offer no additional diagnostic value compared to more reliable and better-tolerated options.