What is the role of electroneuronography (EnoG) in the workup of congenital facial paralysis?

Updated: Jan 07, 2019
  • Author: Alan D Bruns, MD, FACS; Chief Editor: Arlen D Meyers, MD, MBA  more...
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Answer

Electrophysiology tests of facial nerve function can be useful to determine the extent of nerve disruption and to assist with future surgical planning.

  • Electroneuronography (EnoG) is usually the study of choice.

    • This test involves a quantitative analysis of the extent of degeneration. It is not dependent upon the observer.

    • The summation potential is recorded.

    • If more than 90% degeneration has occurred in traumatic congenital facial paralysis consider surgical decompression. (In newborns, waiting 5 weeks is prudent.)

    • An EnoG within 48 hours of a congenital traumatic injury typically reveals normal facial nerve function, whereas, in congenital developmental paralysis, the initial EnoG reveals facial nerve function to be absent or weak because of longstanding neural degeneration or nerve absence. [10]


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