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Is Serial Electroneuronography Indicated Following Temporal Bone Trauma?

Aaron Kyle Remenschneider1, Suzanne Michalak, Elliott D Kozin

  • 1*Department of Otolaryngology, Massachusetts Eye and Ear Infirmary †Department of Otology and Laryngology, Harvard Medical School, Boston, Massachusetts.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|January 24, 2017
PubMed
Summary
This summary is machine-generated.

Serial electroneuronography (ENoG) can help manage facial nerve (FN) injuries after temporal bone trauma, especially when initial tests are inconclusive. This approach aids in deciding on late decompression for better FN recovery.

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Area of Science:

  • Neurosurgery
  • Otolaryngology
  • Trauma Surgery

Background:

  • Facial nerve (FN) decompression is recommended within 2 weeks of temporal bone trauma if electroneuronography (ENoG) shows >90% degeneration.
  • Current guidelines may not fully address cases where initial ENoG is misleading or injury occurs later.

Purpose of the Study:

  • To evaluate the utility of serial ENoG in guiding facial nerve management beyond the typical 2-week window.
  • To identify patients with temporal bone trauma and facial nerve paresis who might benefit from delayed surgical intervention.

Main Methods:

  • Retrospective review of nine adult patients with blunt temporal bone trauma and ipsilateral facial nerve paralysis.
  • Analysis of facial nerve function using House-Brackmann (HB) grading.
  • Application of serial electroneuronography (ENoG) in selected cases to monitor nerve degeneration over time.

Main Results:

  • A single ENoG was predictive of final outcome in 6 out of 7 patients, but one showed unexpected poor recovery (HB 4).
  • Two patients with initially reassuring serial ENoGs demonstrated declining facial nerve function on subsequent testing.
  • Both patients who underwent late decompression based on serial ENoG showed excellent recovery (HB 1 and HB 2).

Conclusions:

  • While initial ENoG is often sufficient, serial ENoG can reveal declining facial nerve function in selected cases beyond 2 weeks post-trauma.
  • Serial ENoG may identify patients who could benefit from late facial nerve decompression, improving long-term outcomes.