Polyimide Electrode-Based Electrical Stimulation Impedes Early Stage Muscle Graft Regeneration.

Abstract:

:Given the increasing use of regenerative free muscle flaps for various reconstructive procedures and neuroprosthetic applications, there is great interest and value in their enhanced regeneration, revascularization, and reinnervation for improved functional recovery. Here, we implant polyimide-based mircroelectrodes on free flap grafts and perform electrical stimulation for 6 weeks in a murine model. Using electrophysiological and histological assessments, we compare outcomes of stimulated grafts with unstimulated control grafts. We find delayed reinnervation and abnormal electromyographic (EMG) signals, with significantly more polyphasia, lower compound muscle action potentials and higher fatigability in stimulated animals. These metrics are suggestive of myopathy in the free flap grafts stimulated with the electrode. Additionally, active inflammatory processes and partial necrosis are observed in grafts stimulated with the implanted electrode. The results suggest that under this treatment protocol, implanted epimysial electrodes and electrical stimulation to deinnervated, and devascularized flaps during the early recovery phase may be detrimental to regeneration. Future work should determine the optimal implantation and stimulation window for accelerating free muscle graft regeneration.

journal_name

Front Neurol

journal_title

Frontiers in neurology

authors

Srinivasan S,Vyas K,McAvoy M,Calvaresi P,Khan OF,Langer R,Anderson DG,Herr H

doi

10.3389/fneur.2019.00252

subject

Has Abstract

pub_date

2019-03-22 00:00:00

pages

252

issn

1664-2295

journal_volume

10

pub_type

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