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Multiple Electrodes for Detecting Spikes in Partial Complex Seizures

Published online by Cambridge University Press:  18 September 2015

R. Mark Sadler  and
John Goodwin
R. Mark Sadler*
Affiliation:
Department of Medicine, Dalhousie University, Halifax, Nova Scotia and the Department of Diagnostic Neurophysiology, The General Hospital, St. John's, Newfoundland
John Goodwin
Affiliation:
Department of Medicine, Dalhousie University, Halifax, Nova Scotia and the Department of Diagnostic Neurophysiology, The General Hospital, St. John's, Newfoundland
*
Division of Neurology, Room 2150, Ambulatory Care Center, Victoria General Hospital, Halifax, Nova Scotia, Canada B3H 1Y6
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Abstract:

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The contribution of various electroencephalographic electrodes in detecting spikes from patients with seizures of suspected anterior temporal origin was prospectively studied with a standard protocol. The following electrodes were studied: International Standard 10-20 positions F7-8 and A1-2, sphenoidal (SP), nasopharyngeal (NP), anterior temporal (Tl-2), mandibular notch surface (MNS), and mandibular notch subdermal (MNSD). Twenty patients were recorded of whom 16 demonstrated anterior temporal spikes. There was no difference in the number of spikes detected by SP, MNS, MNSD, or Tl-2 electrodes (p < 0.05); however these electrodes detected significantly more spikes than NP, F7-8, or A1-2. The SP electrode recorded spikes of highest amplitude (p < 0.05). We conclude that for patients suspected of having seizures of anterior temporal origin, (1) a substantial number of spikes will be missed if only the International Standard electrode system is employed; (2) in comparison to SP electrodes the noninvasive and easily applied MNS or Tl-2 electrodes will detect almost all spikes and should be used in outpatient EEG recordings; (3) NP electrodes provide no information that cannot be obtained by more reliable and better tolerated electrodes.

Type
Original Articles
Information
Canadian Journal of Neurological Sciences , Volume 16 , Issue 3 , August 1989 , pp. 326 - 329
Copyright
Copyright © Canadian Neurological Sciences Federation 1989

References

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