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Cochlear Implant Stimulation Parameters Play a Key Role in Reducing Facial Nerve Stimulation.

Lutz Gärtner1, Bradford C Backus2, Nicolas Le Goff2

  • 1Department of Otolaryngology, Hannover Medical School, 30625 Hannover, Germany.

Journal of Clinical Medicine
|October 14, 2023
PubMed
Summary
This summary is machine-generated.

Facial nerve stimulation in cochlear implant (CI) users can be mitigated by specific stimulation parameters and grounding techniques. This study provides evidence that implant technology, not surgical adjustments, is key to reducing unwanted stimulation.

Keywords:
CIFNSOMRPOticon Medical Research Platformcochlear implantelectrodefacial nervestimulation parameters

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Area of Science:

  • Audiology
  • Neurosurgery
  • Biomedical Engineering

Background:

  • Facial nerve stimulation (FNS) affects 5.6% of cochlear implant (CI) users, potentially impairing hearing or requiring CI deactivation.
  • Re-implantation with Oticon Medical (OM) Neuro-Zti implants shows promise for managing FNS, but the underlying reasons remain unclear.
  • Distinguishing between surgical factors and implant-specific features (stimulation parameters, grounding) is crucial for understanding FNS mitigation.

Purpose of the Study:

  • To investigate whether unique stimulation parameters and grounding schemes of the OM Neuro-Zti implant reduce FNS compared to traditional stimulation methods.
  • To differentiate the impact of surgical factors versus implant-specific electrical properties on mitigating FNS in CI users.

Main Methods:

  • Two CI subjects with prior FNS were studied post-re-implantation with OM Neuro-Zti devices.
  • The Oticon Medical Research Platform (OMRP) was used to deliver traditional monopolar biphasic cathodic-first pulses and distinct OM clinical stimulation to single electrodes.
  • Stimulation intensity was gradually increased until FNS or excessive loudness occurred.

Main Results:

  • Non-auditory/FNS sensations were elicited with traditional stimulation parameters.
  • No FNS or non-auditory sensations were reported with the OM clinical stimulation parameters, even at higher intensities.
  • This outcome was observed consistently across both subjects.

Conclusions:

  • The study provides the first direct evidence that specific stimulation parameters and grounding techniques, inherent to the OM Neuro-Zti implant, are primarily responsible for mitigating FNS.
  • These findings suggest that technological design, rather than surgical placement, is the key factor in resolving unwanted facial nerve stimulation in cochlear implant users.