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Related Experiment Video

Updated: Sep 16, 2025

Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process

Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process

Published on: June 21, 2024

Longitudinal changes in electrical stapedius reflex thresholds (eSRT) in children with cochlear implants.

Franz Muigg¹, Simone Graf¹, Maria Magdalena Mair¹

¹University Hospital for Hearing, Speech & Voice Disorders, Medical University of Innsbruck, Innsbruck, Austria.

European Archives of Oto-Rhino-Laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery

|July 4, 2025

Summary

This summary is machine-generated.

The electrically evoked stapedius reflex threshold (eSRT) in cochlear implant (CI) users stabilizes within six months but shows decreasing variance for up to five years. This suggests adjusting CI fitting schedules based on these temporal changes.

Keywords:

Audiology Cochlear implant Electrically evokelectrically evoked stapedius reflex

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Area of Science:

Audiology
Biomedical Engineering
Neuroscience

Background:

The electrically evoked stapedius reflex threshold (eSRT) is a key metric for estimating the maximum comfort level (MCL) in cochlear implant (CI) fitting.
Understanding the long-term changes in eSRT is crucial for optimizing CI programming and patient outcomes.

Purpose of the Study:

To investigate the long-term temporal evolution of the eSRT over a ten-year period in pediatric cochlear implant users.
To analyze trends in charge unit (QU) values and their variance to inform CI fitting protocols.

Main Methods:

Retrospective analysis of fitting map data from 50 cochlear-implanted ears in 26 children.
Application of time-series statistical methods to examine trends in charge unit (QU) values and variance, normalized to individual baselines.

Main Results:

The mean eSRT (QU) significantly increased in the first six months post-implantation, then plateaued.
Variance in eSRT significantly decreased over the first five years, with identified turning points at 6 months, 18 months, and 4.25 years.

Conclusions:

CI fitting schedules should align with the observed temporal changes in eSRT variance.
Frequent CI fittings are recommended in the first 18 months, followed by annual fittings up to four years post-implantation.
Less frequent follow-up appointments may be sufficient after the initial four-year period.