Quantitative facial electromyography monitoring after hypoglossal-facial jump nerve suture.

Authors:
Jan Flasar
Jan Flasar
Department of OtorhinolaryngologyJena University HospitalJenaGermany
Gerd Fabian Volk
Gerd Fabian Volk
Jena University Hospital
Germany
Thordis Granitzka
Thordis Granitzka
Jena University Hospital
Katharina Geisler
Katharina Geisler
Institute of Diagnostic Virology
Germany
Thomas Lehmann
Thomas Lehmann
Aachen University of Technology (RWTH)
Germany
Orlando Guntinas-Lichius
Orlando Guntinas-Lichius
Jena University Hospital
Germany

Laryngoscope Investig Otolaryngol 2017 10 25;2(5):325-330. Epub 2017 Sep 25.

Department of Otorhinolaryngology Jena University Hospital Jena Germany.

Objectives/hypothesis: The time course of the reinnervation of the paralyzed face after hypoglossal-facial jump nerve suture using electromyography (EMG) was assessed. The relation to the clinical outcome was analyzed.

Study Design: Retrospective single-center cohort study.

Methods: Reestablishment of motor units was studied by quantitative EMG and motor unit potential (MUP) analysis in 11 patients after hypoglossal-facial jump nerve suture. Functional recovery was evaluated using the Stennert index (0 = normal; 10 = maximal palsy).

Results: Clinically, first movements were seen between 6 and >10 months after surgery in individual patients. Maximal improvement was achieved at 18 months. The Stennert index decreased from 7.9 ± 2.0 preoperatively to a final postoperative score of 5.8 ± 2.4. EMG monitoring performed for 2.8 to 60 months after surgery revealed that pathological spontaneous activity disappeared within 2 weeks. MUPs were first recorded after the 2nd month and present in all 11 patients 8-10 months post-surgery. Polyphasic regeneration potentials first appeared at 4-10 months post-surgery. The MUP amplitudes increased between the 3rd and 15th months after surgery to values of control muscles. The MUP duration was significantly increased above normal values between the 3rd and 24th months after surgery.

Conclusion: Reinnervation can be detected at least 2 months earlier by EMG than by clinical evaluation. Changes should be followed for at least 18 months to assess outcome. EMG changes reflected the remodeling of motor units due to axonal regeneration and collateral sprouting by hypoglossal nerve fibers into the reinnervated facial muscle fibers.

Level Of Evidence: 3b.

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http://dx.doi.org/10.1002/lio2.95DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5655551PMC
October 2017
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