Vagus nerve stimulation for refractory epilepsy: long term efficacy and side-effects

Area of Science:

• Neurology
• Neurosurgery
• Epileptology

Background:

• Vagus nerve stimulation (VNS) is an adjunctive therapy for refractory partial-onset seizures.
• Long-term efficacy and safety of VNS in Chinese patients with refractory epilepsy were evaluated.

Purpose of the Study:

• To assess the long-term effectiveness and safety of VNS in a Chinese cohort with refractory epilepsy.
• To determine the sustained impact of VNS on seizure frequency and patient outcomes.

Main Methods:

• 13 patients ineligible for surgery received the Cyberonics VNS system.
• Seizure frequency, physical exams, and side effects were monitored for at least 18 months.

Main Results:

• Mean treatment duration was 47.4 months; longest follow-up was 71 months.
• Mean baseline seizure frequency was 26.6 per month, with reductions of 33.2%, 47.1%, and 40.0% at 6, 12, and 18 months.
• One patient achieved seizure freedom; 46% had ≥50% seizure reduction, while 39% showed poor response (<20% reduction).

Conclusions:

• VNS demonstrated sustained effectiveness and good tolerability in this patient group.
• VNS benefited a subgroup of patients with intractable convulsions, indicating personalized treatment responses.