• Karim Mithani, Alexandre Boutet, Jurgen Germann, Gavin J B Elias, Alexander G Weil, Ashish Shah, Magno Guillen, Byron Bernal, Justin K Achua, John Ragheb, Elizabeth Donner, Andres M Lozano, Elysa Widjaja, and George M Ibrahim.
• Faculty of Medicine, University of Toronto, Toronto, ON, Canada.
• Sci Rep. 2019 Dec 9; 9 (1): 18598.

AbstractTreatment-resistant epilepsy is a common and debilitating neurological condition, for which neurosurgical cure is possible. Despite undergoing nearly identical ablation procedures however, individuals with treatment-resistant epilepsy frequently exhibit heterogeneous outcomes. We hypothesized that treatment response may be related to the brain regions to which MR-guided laser ablation volumes are functionally connected. To test this, we mapped the resting-state functional connectivity of surgical ablations that either resulted in seizure freedom (N = 11) or did not result in seizure freedom (N = 16) in over 1,000 normative connectomes. There was no difference seizure outcome with respect to the anatomical location of the ablations, and very little overlap between ablation areas was identified using the Dice Index. Ablations that did not result in seizure-freedom were preferentially connected to a number of cortical and subcortical regions, as well as multiple canonical resting-state networks. In contrast, ablations that led to seizure-freedom were more functionally connected to prefrontal cortices. Here, we demonstrate that underlying normative neural circuitry may in part explain heterogenous outcomes following ablation procedures in different brain regions. These findings may ultimately inform target selection for ablative epilepsy surgery based on normative intrinsic connectivity of the targeted volume.

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