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Performing Intracochlear Electrocochleography During Cochlear Implantation
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Postoperative Electrocochleography from Hybrid Cochlear Implant users: An Alternative Analysis Procedure.

Jeong-Seo Kim1, Viral D Tejani1, Paul J Abbas1

  • 1Department of Communication Sciences and Disorders, University of Iowa, Iowa City, IA, USA; Department of Otolaryngology - Head & Neck Surgery, University of Iowa Hospitals and Clinics, Iowa City, IA, USA.

Hearing Research
|November 6, 2018
PubMed
Summary

A new, efficient "short window" method for recording electrocochleography (ECoG) responses in cochlear implant (CI) users is reliable and sensitive to hearing changes. This technique correlates well with audiometric thresholds, making it suitable for clinical use.

Keywords:
Auditory nerve neurophonicCochlear implantCochlear microphonicElectrocochleographyHearing preservationHybridNeural response telemetry

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Area of Science:

  • Otoacoustic Emissions and Electrophysiology
  • Auditory Neurophysiology
  • Cochlear Implant Technology

Background:

  • Preserving acoustic hearing in cochlear implant (CI) users is increasingly feasible with advanced electrode arrays and surgical methods.
  • Previous methods for recording acoustically evoked electrocochleography (ECoG) using Neural Response Telemetry (NRT) in Hybrid CI users were time-consuming.
  • ECoG responses, including cochlear microphonic (CM/DIF) and auditory nerve neurophonic (ANN/SUM), provide insights into auditory system function.

Purpose of the Study:

  • To evaluate the feasibility of a modified, more efficient "short window" ECoG recording method.
  • To assess the reliability and sensitivity of ECoG measures obtained with the short window technique.
  • To determine the relationship between short window ECoG measures (CM/DIF, ANN/SUM) and audiometric thresholds in CI users.

Main Methods:

  • Thirty-four adult Hybrid CI users were tested with acoustic tone bursts at 250, 500, 750, and 1000 Hz.
  • Acoustically evoked ECoG responses were recorded using the "short window" method from the most apical intracochlear electrode.
  • Response thresholds, amplitudes, reliability, sensitivity, and correlations with audiometric thresholds were analyzed.

Main Results:

  • The short window method yielded ECoG responses (CM/DIF and ANN/SUM) that were positively correlated with the conventional "long window" method.
  • High test-retest reliability was confirmed by similar ECoG responses in subjects with stable hearing.
  • ECoG thresholds increased in subjects who experienced hearing loss, demonstrating sensitivity to audiometric changes; significant correlations were found between ECoG and audiometric thresholds.

Conclusions:

  • The "short window" ECoG recording technique is efficient, reliable, and repeatable for intracochlear measures in CI users.
  • This method allows for more frequency-specific data collection and yields results comparable to the long window technique.
  • The strong correlation between physiological and audiometric thresholds suggests the short window method's potential for clinical application using readily available software.