Vagus nerve stimulation in pediatric patients with Lennox-Gastaut syndrome: a systematic review.

In 30 seconds

This systematic review assessed the efficacy and safety of vagus nerve stimulation (VNS) for refractory Lennox-Gastaut syndrome in pediatric patients, drawing on observational studies and case series. Across the combined sample of 527 patients, 375 had a reduction in seizure frequency greater than 50% after VNS; some cases reported complete remission. Responses appeared strongest for atonic seizures, followed by tonic and absence seizures. Qualitative improvements in alertness, attention, and sleep were also reported. The authors noted substantial risk of bias in outcome measurement and concluded that VNS may have utility, while emphasizing the need for cautious, individualized decisions.

Key findings

• Among 527 patients, 375 achieved a reduction greater than 50% in seizure frequency after VNS.
• Some cases reported complete seizure remission; responses appeared greatest for atonic seizures, followed by tonic and absence seizures.
• Studies reported qualitative improvements in alertness, attention, and sleep quality.
• Outcome measurement had high risk of bias, partly because blinding was impractical and caregiver-reported outcomes were subjective.

Why it matters

The review brings together evidence on VNS for a difficult-to-treat pediatric epilepsy syndrome and suggests that seizure reductions and broader qualitative benefits may occur. However, the evidence comes from observational studies and case series, with important measurement bias and variable responses. These findings can inform clinical discussions while underscoring uncertainty about the size and consistency of benefit.

What to keep in mind

The evidence was based on observational studies and case series, with high risk of bias in outcome measurement. Clinical responses varied alongside differences in stimulation parameters and baseline conditions.