[HTML][HTML] Fascicle localisation within peripheral nerves through evoked activity recordings: a comparison between electrical impedance tomography and multi-electrode …
Journal of neuroscience methods, 2021•Elsevier
Background The lack of understanding of fascicular organisation in peripheral nerves limits
the potential of vagus nerve stimulation therapy. Two promising methods may be employed
to identify the functional anatomy of fascicles within the nerve: fast neural electrical
impedance tomography (EIT), and penetrating multi-electrode arrays (MEA). These could
provide a means to image the compound action potential within fascicles in the nerve. New
method We compared the ability to localise fascicle activity between silicon shanks (SS) and …
the potential of vagus nerve stimulation therapy. Two promising methods may be employed
to identify the functional anatomy of fascicles within the nerve: fast neural electrical
impedance tomography (EIT), and penetrating multi-electrode arrays (MEA). These could
provide a means to image the compound action potential within fascicles in the nerve. New
method We compared the ability to localise fascicle activity between silicon shanks (SS) and …
Background
The lack of understanding of fascicular organisation in peripheral nerves limits the potential of vagus nerve stimulation therapy. Two promising methods may be employed to identify the functional anatomy of fascicles within the nerve: fast neural electrical impedance tomography (EIT), and penetrating multi-electrode arrays (MEA). These could provide a means to image the compound action potential within fascicles in the nerve.
New method
We compared the ability to localise fascicle activity between silicon shanks (SS) and carbon fibre (CF) multi-electrode arrays and fast neural EIT, with micro-computed tomography (MicroCT) as an independent reference. Fast neural EIT in peripheral nerves was only recently developed and MEA technology has been used only sparingly in nerves and not for source localisation. Assessment was performed in rat sciatic nerves while evoking neural activity in the tibial and peroneal fascicles.
Results
Recorded compound action potentials were larger with CF compared to SS (∼700 μV vs ∼300 μV); however, background noise was greater (6.3 μV vs 1.7 μV) leading to lower SNR. Maximum spatial discrimination between Centres-of-Mass of fascicular activity was achieved by fast neural EIT (402 ± 30 μm) and CF MEA (414 ± 123 μm), with no statistical difference between MicroCT (625 ± 17 μm) and CF (p > 0.05) and between CF and EIT (p > 0.05). Compared to CF MEAs, SS MEAs had a lower discrimination power (103 ± 51 μm, p < 0.05).
Comparison with existing methods
EIT and CF MEAs showed localisation power closest to MicroCT. Silicon MEAs adopted in this study failed to discriminate fascicle location. Re-design of probe geometry may improve results.
Conclusions
Nerve EIT is an accurate tool for assessment of fascicular position within nerves. Accuracy of EIT and CF MEA is similar to the reference method. We give technical recommendations for performing multi-electrode recordings in nerves.
Elsevier
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