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Updated: May 31, 2026

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Published on: August 4, 2023

Negative effect of deep cochlear implant electrode insertion on speech perception.

Sarah A Sydlowski¹, Sarah R Oakley, Sarah A Borton

¹Mayo Clinic Arizona, AZ, United States. sydlows@ccf.org

Cochlear Implants International

|July 16, 2011

Summary

Deep insertion of cochlear implants (CI) can harm speech recognition. This case study highlights how excessive depth can cause frequency-to-place mismatch, worsening hearing outcomes.

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Area of Science:

Otolaryngology
Neuroscience
Biomedical Engineering

Background:

Cochlear implants (CI) are vital for hearing restoration.
Optimizing CI electrode array insertion depth is crucial for speech perception.
Previous research explored insertion depth effects, but detrimental impacts of excessive depth are less understood.

Observation:

A cochlear implant (CI) recipient experienced poor speech recognition despite a deep electrode array insertion.
Evaluation revealed the deep insertion likely caused a frequency-to-place mismatch.
The device was explanted and reimplanted at a more optimal depth.

Findings:

Excessively deep electrode array insertion in cochlear implants (CI) can significantly impair speech recognition.

Related Experiment Videos

Last Updated: May 31, 2026

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation

Published on: August 4, 2023

A frequency-to-place mismatch, resulting from deep insertion, was identified as the cause of degraded speech understanding.

Successful reimplantation at a shallower depth restored functional hearing outcomes.

Implications:

This case challenges the 'deeper is better' assumption for cochlear implant (CI) electrode insertion.
Thorough evaluation of patient-reported issues is critical for diagnosing CI-related problems.
Understanding frequency-to-place mismatch is essential for optimizing cochlear implant (CI) performance and patient satisfaction.