• Kai Lehtimäki, Volker A Coenen, Antonio Gonçalves Ferreira, Paul Boon, Christian Elger, Rod S Taylor, Philippe Ryvlin, Antonio Gil-Nagel, Frans Gielen, Thomas C Brionne, Abdallah Abouihia, Grégory Beth, and MORE investigators.
• Department of Neurosciences and Rehabilitation, Tampere University Hospital, Tampere, Finland.
• Neurosurgery. 2019 Jan 1; 84 (1): 141-150.

BackgroundThe Medtronic Registry for Epilepsy (MORE; Medtronic Inc, Dublin, Ireland) is an open label observational study evaluating the long-term effectiveness, safety, and performance of deep brain stimulation (DBS) of the anterior nucleus of thalamus (ANT) for the treatment of refractory epilepsy.ObjectiveTo compare the difference in success rate of placing contacts at ANT-target region (ANT-TR) between transventricular (TV) and extraventricular (EV) lead trajectories in 73 ANT-DBS implants in 17 European centers participating in the MORE registry.MethodsThe success rate of placing contacts at ANT-TR was evaluated using a screening method combining both individual patient imaging information and stereotactic atlas information to identify contacts at ANT-TR.ResultsEV lead trajectory was used in 53% of the trajectories. Approximately, 90% of the TV lead trajectories had at least 1 contact at ANT-TR, vs only 71% of the EV lead trajectories. The success rate for placing at least 1 contact at ANT-TR bilaterally was 84% for TV implants and 58% for EV implants (P < .05; Fisher's exact). No intracranial bleedings were observed, but 1 cortical infarct was reported following EV lead trajectory.ConclusionThe results of this registry support the use of TV lead trajectories for ANT-DBS as they have a higher probability in placing contacts at ANT-TR, without appearing to compromise procedural safety. Follow-up data collection is continuing in the MORE registry. These data will provide outcomes associated with TV and EV trajectories.

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