Electrical brain stimulation for epilepsy

Area of Science:

• Neurology
• Neurosurgery
• Biomedical Engineering

Background:

• Neurostimulation provides adjustable and reversible modulation of disease symptoms, notably epilepsy.
• Class I evidence supports anterior thalamic deep brain stimulation and responsive neurostimulation for epilepsy.
• Numerous brain sites have been explored in smaller neurostimulation trials for seizures.

Purpose of the Study:

• To review the current state of neurostimulation for epilepsy.
• To highlight the gap in understanding the mechanisms of action for neurostimulation in seizure reduction.
• To discuss the efficacy, benefits over time, and complications associated with neurostimulation therapy.

Main Methods:

• Review of Class I evidence for specific neurostimulation techniques.
• Analysis of animal studies for potential neurostimulation sites and parameters.
• Examination of clinical trial data for various neurostimulation targets.
• Assessment of reported long-term benefits and complications.

Main Results:

• Seizure frequency reduction of approximately 40% acutely, increasing to 50-69% over several years.
• Maximal therapeutic benefits of neurostimulation are typically observed 1-2 years post-implantation.
• Complications are primarily related to surgical implantation and hardware, including infections and electrode misplacement.

Conclusions:

• Neurostimulation is an effective therapy for epilepsy, with benefits that increase over time.
• Further research is needed to elucidate the mechanisms underlying neurostimulation's anti-seizure effects.
• Improved understanding of optimal surgical candidates, sites, and parameters will enhance outcomes in neurostimulation surgery.