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Reinnervation by the contralateral facial nerve in patients with peripheral facial palsy
Author(s) -
CasanovaMolla Jordi,
León Luci,
Castillo Carlos David,
VallsSolé Josep
Publication year - 2011
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.22207
Subject(s) - reinnervation , facial nerve , commissure , anatomy , medicine , stimulation , electromyography , palsy , nerve conduction velocity , facial muscles , facial paralysis , posterior commissure , peripheral , electrophysiology , surgery , pathology , physical medicine and rehabilitation , alternative medicine , nucleus , psychiatry
Reinnervation activity is triggered after complete unilateral peripheral facial palsy (PFP). Methods: In 27 patients with PFP we recorded electromyographic activity with a concentric needle electrode inserted 1 cm lateral to the oral commissure of the affected side. We applied electrical stimuli to the unaffected (contralateral) facial nerve from the tragus to the mid‐lower lip and measured the response latency variability and segmental conduction velocity. Results: Responses to electrical stimulation of the unaffected facial nerve were found in all patients. Mean conduction velocity was 49.6 ± 6.2 m/s between tragus and oral commissure, and 6.0 ± 1.9 m/s between oral commissure and mid‐lower lip. Latency variability was 0.27 ms to facial nerve stimulation and 0.08 ms to oral commissure stimulation. Conclusion: Short distance sprouting of axons that innervate muscle fibers, which originate from the unaffected facial nerve, results in propagation of impulses to muscle fibers in the midline. Muscle Nerve 2011