Effects of acute valproic acid administration on carnitine plasma concentrations in epileptic patients

Roberto Riva, Gaetano Zaccara, Fiorenzo Albani, Giovanni Galli, Roberto Campostrini, Marco Paganini, Agostino Baruzzi

Research output: Contribution to journalArticle

Abstract

Serial plasma samples collected after an acute administration of valproic acid (VPA, 15 mg/kg as oral solution) in epileptic patients were selected for this study. The plasma samples were selected from three different groups of patients; patients on phenobarbital and phenytoin with clinical VPA intolerance (group A); patients on phenobarbital and phenytoin without clinical VPA toxicity (group B); and patients without phenobarbital and phenytoin and without clinical VPA toxicity (group C). Plasma samples from 6 patients per group were analyzed for carnitines and ammonia. Ammonia levels during acute study increased significantly (P <0.05) in patients who experienced VPA intolerance, while no changes were found in the other patients. After acute VPA administration, total carnitine was unchanged but free carnitine was decreased (P <0.05) and carnitine esters were increased (P <0.05) in all groups of patients studied. No difference in carnitine profiles was seen between patients with or without evidence of VPA toxicity or between patients with or without phenobarbital and phenytoin therapy. The data show that acute VPA administration has an important effect on carnitine metabolism. However, unlike the acute effect on ammonia metabolism, this acute effect does not seem to be correlated with any associated antiepileptic therapy, nor does it predict clinical VPA intolerance.

Original languageEnglish
Pages (from-to)149-152
Number of pages4
JournalEpilepsy Research
Volume8
Issue number2
DOIs
Publication statusPublished - 1991

Keywords

  • Ammonia
  • Anticonvulsant
  • Carnitine
  • Drug toxicity
  • Epilepsy
  • Valproic acid

ASJC Scopus subject areas

  • Clinical Neurology
  • Pediatrics, Perinatology, and Child Health
  • Neurology

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