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Region Hovedstaden - en del af Københavns Universitetshospital
Udgivet

Effect of medication withdrawal on the interictal epileptiform EEG discharges in presurgical evaluation

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Medication withdrawal (MW) is an important method of provoking seizures and activating epileptiform EEG activity during the diagnostic work-up of patients evaluated for epilepsy surgery. Previously it was suggested that MW might influence the seizure-type and activate cortical areas otherwise not producing epileptiform discharges, leading to a false localization of the irritative zone. In order to investigate this we reviewed 42 consecutive cases of MW, of 36 patients, during a 3-year period. We compared seizure frequency, seizure-types and the localization of interictal epileptiform discharges before and after MW. Seizure frequency was significantly higher after MW. In the whole group we found an increase in seizure propagation: the proportion of the complex partial seizures and secondarily generalised seizures increased, while the proportion of the simple partial seizures decreased following MW. In one-third of the patients the interictal EEGs after the MW were different from those recorded before the MW. However, in these discordant cases the EEG findings after the MW (and not before the MW) were concordant with the seizure onset zone and the lesional zone. We conclude that MW is an effective and reliable seizure provoking method, and it does not lead to false localization of the irritative zone. (C) 2010 British Epilepsy Association. Published by Elsevier Ltd. All rights reserved
OriginalsprogEngelsk
TidsskriftSeizure - European Journal of Epilepsy
Vol/bind19
Udgave nummer3
Sider (fra-til)137-139
Antal sider3
ISSN1059-1311
StatusUdgivet - 2010

ID: 32337548