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Effect of valproate and carbamazepine on visual evoked potentials in epileptic children
A Yüksel1, O Sarslan, K Devranoğlu
1Department of Pediatric Neurology, Cerrahpaşa Faculty of Medicine, Istanbul University, Turkey.
Insights
Carbamazepine (CBZ) monotherapy in epileptic children significantly prolonged visual evoked potential (VEP) P-100 latencies, indicating slowed central nervous system conduction. Sodium valproate (SV) showed no significant VEP changes.
Area of Science:
- Neuroscience
- Clinical Neurology
- Pharmacology
Background:
- Epilepsy treatment often involves antiepileptic drugs (AEDs).
- Carbamazepine (CBZ) and sodium valproate (SV) are common AEDs.
- Assessing the central nervous system (CNS) effects of AEDs is crucial.
Purpose of the Study:
- To investigate the impact of CBZ and SV monotherapy on visual evoked potentials (VEP) in epileptic children.
- To evaluate the utility of VEP in monitoring AED effects on CNS conduction.
Main Methods:
- A study involving 18 epileptic children on CBZ and 9 on SV.
- Pattern reversal VEP measurements were taken before and after 1 year of AED treatment.
- Analysis focused on VEP amplitude and P-100 latency changes.
Main Results:
- No consistent changes in VEP amplitude were observed after 1 year of CBZ or SV therapy.
- VEP P-100 latencies were significantly prolonged in children treated with CBZ for 1 year.
- No significant latency changes were noted in the SV group.
Conclusions:
- CBZ monotherapy can lead to a slowing of central impulse conduction in epileptic children.
- VEP is a valuable tool for assessing the neurophysiological effects of AEDs within the CNS.
- Further research may explore long-term VEP changes with various AEDs.
Abstract:
The effects of carbamazepine (CBZ) and sodium valproate (SV) monotherapy on visual evoked potentials (VEP) were studied in 18 epileptic children receiving CBZ and nine epileptic children receiving SV. Pattern reversal VEP were determined before the administration of antiepileptic drugs (AED) and 1 year later during which time the patients had received AED. The VEP amplitude showed no consistent changes after 1 year of CBZ and SV therapy, but VEP P-100 latencies were significantly prolonged after 1 year of CBZ therapy. We conclude that CBZ causes a slowing down of central impulse conduction and that VEP is useful to evaluate the effects of AED within the central nervous system.