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Neurostimulation therapy for epilepsy: current modalities and future directions
Aaron A Cohen-Gadol1, Jeffrey W Britton, Nicholas M Wetjen
1Department of Neurologic Surgery, Mayo Clinic, Rochester, Minn 55905, USA.
Mayo Clinic Proceedings
|February 14, 2003
Summary
Vagus nerve stimulation (VNS) offers a viable adjunctive treatment for epilepsy, reducing seizure frequency by about 30% in clinical trials. While not a cure, VNS provides an option for patients unresponsive to medication and not suitable for surgery.
Area of Science:
- Neurology
- Neurosurgery
- Biomedical Engineering
Background:
- Neurostimulation represents an emerging therapeutic modality for epilepsy management.
- Vagus nerve stimulation (VNS) is the sole FDA-approved neurostimulation therapy for epilepsy, functioning as an adjunctive treatment.
- The precise mechanisms underlying VNS efficacy remain incompletely elucidated.
Purpose of the Study:
- To review the historical development, proposed mechanisms of action, clinical trial data, adverse effects, and future prospects of VNS for epilepsy.
- To explore other neurostimulation targets currently under investigation for epilepsy treatment.
Main Methods:
- Review of randomized, double-blind clinical trials assessing VNS efficacy in epilepsy.
- Analysis of long-term follow-up data on VNS treatment outcomes.
- Survey of ongoing research into alternative neurostimulation sites for epilepsy.
Main Results:
- Two randomized trials demonstrated an approximate 30% reduction in seizure frequency after 3 months of VNS.
- Long-term studies indicate improved response over time, with 35% experiencing >=50% seizure reduction and 20% experiencing >=75% reduction at 18 months.
- A low percentage of patients achieve complete seizure freedom or become medication-free with VNS.
Conclusions:
- VNS is a valuable adjunctive therapy for epilepsy, particularly for patients unsuitable for surgery or who have persistent seizures despite optimal medical management.
- While VNS can significantly reduce seizure frequency, it is not a curative treatment.
- Ongoing research is exploring novel neurostimulation targets to enhance epilepsy treatment efficacy.