Generalized Periodic Discharges: Nonconvulsive Status Epilepticus or Diffuse Encephalopathy-A Case Comparison.
Chanawee Hirunpattarasilp, Joshua Edmondson, Daniel Wood et al.
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Case in brief
The report describes nonconvulsive status epilepticus (NCSE) with coma in a patient whose neurotoxicity was attributed to ceftriaxone. The EEG showed generalized periodic discharges (GPDs), a pattern often seen in comatose, critically ill patients with NCSE. The authors compared this presentation with NCSE without coma in a patient with chronic focal epilepsy, whose altered awareness was characterized by dialepsis: eyes open and posture retained, but unresponsive with amnesia. The comparison highlights that GPDs in coma may be an epiphenomenon, whereas dialepsis is considered a clinical manifestation of epileptiform activity.
What made this case unusual
The report contrasts ceftriaxone-associated NCSE with coma and GPDs against NCSE without coma in chronic focal epilepsy, emphasizing that similar epileptiform EEG activity may have different clinical significance.
Diagnostic / clinical pearl
Interpret GPDs in the clinical context: in comatose patients they may be an epiphenomenon rather than the direct cause of coma; dialepsis in NCSE without coma is described as a manifestation of epileptiform discharges.