Abstract
Background
White matter stimulation in an awake patient is currently the gold standard for identification of functional pathways. Despite the robustness and reproducibility of this method, very little is known about the electrophysiological mechanisms underlying the functional disruption. Axono-cortical evoked potentials (ACEPs) provide a reliable technique to explore these mechanisms.
Objective
To describe the shape and spatial patterns of ACEPs recorded when stimulating the white matter of the caudal part of the right superior frontal gyrus while recording in the precentral gyrus.
Methods
We report on three patients operated on under awake condition for a right superior frontal diffuse low-grade glioma. Functional sites were identified in the posterior wall of the cavity, whose 2–3-mA stimulation generated an arrest of movement. Once the resection was done, axono-cortical potentials were evoked: recording electrodes were put over the precentral gyrus, while stimulating at 1 Hz the white matter functional sites during 30–60 s. Unitary evoked potentials were averaged off-line. Waveform was visually analyzed, defining peaks and troughs, with quantitative measurements of their amplitudes and latencies. Spatial patterns of ACEPs were compared with patients’ own and HCP-derived structural connectomics.
Results
Axono-cortical evoked potentials (ACEPs) were obtained and exhibited complex shapes and spatial patterns that correlated only partially with structural connectivity patterns.
Conclusion
ACEPs is a new IONM methodology that could both contribute to elucidate the propagation of neuronal activity within a distributed network when stimulating white matter and provide a new technique for preserving motor control abilities during brain tumor resections.
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Acknowledgments
MD was supported by the CRC-chirurgie 2016 from AP-HP. EM was supported by INSERM, contrat interface 2018.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee of Lariboisière hospital and with the 1964 Helsinki declaration and its later amendments. Informed consent was obtained from all individual participants included in the study.
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This article is part of the Topical Collection on Tumor - Glioma
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Wasserman, D., Valero-Cabré, A., Dali, M. et al. Axono-cortical evoked potentials as a new method of IONM for preserving the motor control network: a first study in three cases. Acta Neurochir 163, 919–935 (2021). https://doi.org/10.1007/s00701-020-04636-8
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DOI: https://doi.org/10.1007/s00701-020-04636-8