Vagus nerve stimulation and Lennox-Gastaut syndrome: a review of the literature and data from the VNS patient registry.

Lennox-Gastaut syndrome (LGS) is a severe form of childhood epilepsy that is usually refractory to medical management. When medication fails, alternative therapies are considered. Among these are two surgical options: corpus callosotomy and vagus nerve stimulation (VNS). Safety and efficacy are two important factor to consider when selecting an appropriate treatment. VNS is safer than callosotomy, but its efficacy is more difficult to assess. Available studies evaluate its effectiveness using a mixed population of patients (some with prior epilepsy surgery), a multitude of VNS settings, and variable endpoints. To estimate the efficacy of VNS in patients with LGS, a review of the medical literature and the VNS Patient Registry was performed. Within the limits of this type of study, the results showed that VNS appears to be equally as effective as callosotomy. Because VNS has a lower potential for adverse effects, these results suggest that VNS should be considered first in appropriately selected patients.