Preliminary study of time to recovery of rat sciatic nerve from high frequency alternating current nerve block

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Title: Preliminary study of time to recovery of rat sciatic nerve from high frequency alternating current nerve block
Authors: Rapeaux, A
Brunton, E
Nazarpour, K
Constandinou, TG
Item Type: Conference Paper
Abstract: High-Frequency alternating current nerve block has great potential for neuromodulation-based therapies. However, no precise measurements have been made of the time needed for nerves to recover from block once the signal has been turned off. This study aims to characterise time to recovery of the rat sciatic nerve after 30 seconds of block at varying amplitudes and frequencies. Experiments were carried out in-vivo to quantify recovery times and recovery completeness within 0.7s from the end of block. The sciatic nerve was blocked with an alternating square wave signal of amplitude and frequency ranging from 2 to 9mA and 10 to 50 kHz respectively. To determine the recovery dynamics the nerve was stimulated at 100 Hz after cessation of the blocking stimulus. Electromyogram signals were measured from the gastrocnemius medialis and tibialis anterior muscles during trials as indicators of nerve function. This allowed for nerve recovery to be measured with a resolution of 10 ms. This resolution is much greater than previous measurements of nerve recovery in the literature. Times for the nerve to recover to a steady state of activity ranged from 20 to 430 milliseconds and final relative recovery activity at 0.7 seconds spanned 0.2 to 1 approximately. Higher blocking signal amplitudes increased recovery time and decreased recovery completeness. These results suggest that blocking signal properties affect nerve recovery dynamics, which could help improve neuromodulation therapies and allow more precise comparison of results across studies using different blocking signal parameters.
Issue Date: 17-Jul-2018
Date of Acceptance: 7-Apr-2018
URI: http://hdl.handle.net/10044/1/58745
Publisher: IEEE
Copyright Statement: This paper is embargoed until publication.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/M020975/1
BH141353 (EP/M025977/1)
Conference Name: 40th International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)
Publication Status: Accepted
Start Date: 2018-07-17
Finish Date: 2018-07-21
Conference Place: Honolulu, Hawaii
Embargo Date: publication subject to indefinite embargo
Appears in Collections:Faculty of Engineering
Electrical and Electronic Engineering



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