title: Absence seizures aggravated by valproic acid.
abstract: OBJECTIVE
  To report on pediatric patients with absence epilepsy who experienced absence seizure aggravation while receiving valproic acid (VPA).
  
  
  METHODS
  The charts of all children from four pediatric epilepsy clinics receiving VPA for absence epilepsy were reviewed. Patients were evaluated and followed up between 1994 and 2000.
  
  
  RESULTS
  Eight cases (six boys) of absence seizure aggravation were detected. Mean age at seizure onset was 5.8 years (range, 3-12 years). Six patients had simple absence seizures, one had myoclonic absences, and one had absences with automatisms. The electroencephalogram in all cases depicted generalized 3-Hz spike-and-wave activities. All eight patients experienced an increase in the frequency of absence seizures within days of VPA introduction. Dose increments resulted in further seizure aggravation. Serum levels of VPA were within therapeutic range in all patients. No case was attributed to VPA-induced encephalopathy. All patients improved on VPA discontinuation. In five children, VPA was reintroduced, resulting in further seizure aggravation.
  
  
  CONCLUSIONS
  VPA can occasionally provoke absence seizure aggravation in patients with absence epilepsy.
authors.affiliation: Pediatric Neurology Unit, Wolfson Medical Center, Holon, Israel. asagie@ccsg.tau.il
authors.forename: T
authors.initials: T
authors.lastname: Lerman-Sagie
authors.forename: N
authors.initials: N
authors.lastname: Watemberg
authors.forename: U
authors.initials: U
authors.lastname: Kramer
authors.forename: E
authors.initials: E
authors.lastname: Shahar
authors.forename: P
authors.initials: P
authors.lastname: Lerman
mesh_terms: D000208:Acute Disease; D000927:Anticonvulsants / Q000009:adverse effects* / Q000627:therapeutic use; D002648:Child; D004832:Epilepsy, Absence / Q000139:chemically induced* / Q000175:diagnosis / Q000188:drug therapy; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D012720:Severity of Illness Index; D014055:Tomography, Emission-Computed / Q000706:statistics & numerical data; D015899:Tomography, Emission-Computed, Single-Photon / Q000706:statistics & numerical data; D014635:Valproic Acid / Q000009:adverse effects* / Q000627:therapeutic use
chemical_list: D000927:Anticonvulsants; D014635:Valproic Acid