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Valproic acid therapy inducing absence status evolving into generalized seizures.
Eli Shahar1, Jameel Andraus, Tally Sagie-Lerman
1Child Neurology Unit & Epilepsy Service, Rambam Medical Center, Rappaport School of Medicine, Haifa, Israel.
Pediatric Neurology
|June 12, 2002
Summary
Valproic acid can rarely trigger absence status and atonic seizures in children with epilepsy. Discontinuing the medication promptly resolves these severe seizure events and disorientation.
Area of Science:
- Neurology
- Pediatric Neurology
- Epileptology
Background:
- Absence epilepsy is a common epilepsy syndrome in children.
- Valproic acid is a widely used antiepileptic drug for various seizure types.
Observation:
- Two children with mild absence epilepsy experienced new-onset absence status epilepticus after initiating valproic acid.
- This progressed to atonic seizures, drop attacks, and disorientation, confirmed by EEG showing generalized spike-wave discharges.
Findings:
- Valproic acid, even at low doses, can induce or worsen absence seizures and atonic seizures in susceptible individuals.
- Abrupt discontinuation of valproic acid led to immediate seizure cessation and cognitive improvement.
Implications:
- Clinicians should consider valproic acid-induced absence status and atonic seizures in pediatric epilepsy management.
- Early recognition and drug withdrawal are crucial for favorable outcomes.
- This highlights the complex and sometimes paradoxical effects of antiepileptic drugs.