Open AccessTopography of generalized periodic epileptiform discharges in postanoxic nonconvulsive status epilepticus
Author(s) -
Sakellariou Dimitris Fotis,
Kostopoulos George Kostantinos,
Richardson Mark Philip,
Koutroumanidis Michalis
Publication year - 2017
Publication title -
epilepsia open
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.247
H-Index - 16
ISSN - 2470-9239
DOI - 10.1002/epi4.12073
Subject(s) - status epilepticus , electroencephalography , coma (optics) , anesthesia , medicine , cardiology , neuroscience , epilepsy , psychology , physics , optics
Summary We studied slow (≤2.5 Hz) nonevolving generalized periodic epileptiform discharges ( GPEDs ) in the electroencephalogram ( EEG ) of comatose patients after cardiac arrest ( CA ) in search of evidence that could assist early diagnosis of possible hypoxic nonconvulsive status epilepticus ( NCSE ) and its differentiation from terminal brain anoxia ( BA ), which can present with a similar EEG pattern. We investigated the topography of the GPEDs in the first post‐ CA EEG s of 13 patients, using voltage‐mapping, and compared findings between two patients with NCSE and GPEDs > 2.5 Hz (group 1), and 11 with GPEDs ≤ 2 Hz, of whom six had possible NCSE (group 2) and five had terminal BA (group 3). Voltage mapping showed frontal maximum for the negative phase of the GPEDs in all patients of groups 1 and 2, but not in any of the patients of group 3, who invariably showed maximization of the negative phase posteriorly. Morphology, amplitude, and duration of the GPEDs varied across the groups, without distinctive features for possible NCSE . These findings provide evidence that, in hypoxic coma after CA with slow GPEDs , anterior topography of the maximum GPED negativity on voltage mapping may be a distinctive biomarker for possible NCSE contributing to the coma.