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Abstract

Deep brain stimulation (DBS) of the anterior nucleus of the thalamus (ANT) DBS is a novel treatment option for refractory focal epilepsy, which is approved by the US food and drug administration (FDA) and the European authorities. This therapy is based on the hypothesis that seizures are propagated via neuronal pathways, either directly or indirectly, involving the anterior nucleus of the thalamus, and eventually cause disruption in consciousness. High-frequency stimulation of this network is expected to inhibit or prevent seizure spread. This hypothesis was supported by experimental data, as well as pilot studies. The antiepileptic effect of ANT-DBS was shown by the SANTE trial, where greater seizure reduction was observed after 3 months of active stimulation compared to sham stimulation. Long-term open-label stimulation demonstrated a clear treatment benefit with 56% and 69% median seizure reduction at 2 and 5 years, respectively. The reported response rate, defined as the percentage of patients with a greater than 50% reduction of seizures, seems somewhat better after ANT-DBS than after vagus nerve stimulation (VNS), but direct comparison trials are not available. The main patient population that showed therapeutic benefit in the published trials had frontal and temporal epilepsies with focal seizures with impaired awareness as the main seizure type. A precise lead location in the ANT seems to be critical for a favorable outcome, and stimulation of deeper structures has been associated with psychiatric side effects. From a surgical perspective, the ANT is a challenging target due to its variable location with respect to common stereotactic landmarks and nearby CSF spaces. Therefore, direct targeting of the ANT using designed MRI methods is recommended.

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Lehtimäki, K., Peltola, J. (2020). Epilepsy. In: Temel, Y., Leentjens, A., de Bie, R., Chabardes, S., Fasano, A. (eds) Fundamentals and Clinics of Deep Brain Stimulation. Springer, Cham. https://doi.org/10.1007/978-3-030-36346-8_15

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  • DOI: https://doi.org/10.1007/978-3-030-36346-8_15

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