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Facial nerve stimulation from cochlear implants

D C Bigelow1, D J Kay, K O Rafter

  • 1Department of Otorhinolaryngology, University of Pennsylvania, Philadelphia 19104, USA.

The American Journal of Otology
|March 31, 1998
PubMed
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Facial nerve stimulation from cochlear implants occurred in 14% of patients, particularly those with otosclerosis or otosyphilis. The labyrinthine facial nerve segment is most commonly affected, and CT scans may predict this complication.

Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Medical Device Technology

Background:

  • Facial nerve stimulation is a potential complication of cochlear implant surgery.
  • Understanding the incidence and causes is crucial for patient safety and surgical planning.

Purpose of the Study:

  • To determine the incidence of facial nerve stimulation in adult cochlear implant recipients.
  • To identify the specific facial nerve segment involved and contributing factors.
  • To assess the utility of preoperative computed tomography (CT) in predicting stimulation.

Main Methods:

  • Retrospective review of adult patients who received cochlear implants.
  • Temporal bone dissections to map facial nerve and cochlear anatomy.
  • Analysis of electrode placement and correlation with stimulation events.

Related Experiment Videos

  • CT evaluation of the relationship between the facial nerve and cochlea.

    • Main Results:

    • Overall incidence of facial nerve stimulation was 14% (8/58 patients).
    • Otosclerosis and otosyphilis were identified as predisposing conditions.
    • Mid-cochlear electrodes near the labyrinthine facial nerve were most frequently implicated.
    • CT scans may indicate potential for facial nerve issues.

    Conclusions:

    • Facial nerve stimulation is more common in patients with otosclerosis and otosyphilis.
    • The labyrinthine segment of the facial nerve is the primary site of stimulation.
    • Preoperative CT imaging may help identify patients at risk for facial nerve stimulation.