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Related Experiment Video

Updated: Feb 12, 2026

Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
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Relation between open-field stapedius reflex thresholds and speech perception in CI users.

Annett Franke-Trieger1, Willy Mattheus1, Josef Seebacher2

  • 1Saxonian Cochlear Implant Centre, Department of Otorhinolaryngology, Head and Neck Surgery, Faculty of Medicine (and University Hospital), Technische Universität Dresden, Dresden, Germany.

International Journal of Audiology
|February 10, 2026
PubMed
Summary
This summary is machine-generated.

Open-field stapedius reflex thresholds (oSRT) outside the normal range correlate with poorer word recognition scores in cochlear implant (CI) users. Electrically evoked stapedius reflex threshold (eSRT)-based fitting enhances speech perception outcomes.

Keywords:
Cochlear implantoverstimulationspeech perceptionstapedius reflex thresholdsunderstimulation

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Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Cochlear implant (CI) fitting aims to optimize auditory perception.
  • Objective measures like stapedius reflex thresholds (SRTs) may refine CI fitting.
  • The relationship between open-field SRTs (oSRTs) and speech recognition in CI users requires further investigation.

Purpose of the Study:

  • To evaluate the association between oSRTs and word recognition scores (WRS) in CI users.
  • To compare the effectiveness of CI fitting based on electrically evoked SRTs (eSRTs) versus subjective fitting methods.

Main Methods:

  • Prospective study involving 39 experienced MED-EL CI users (44 ears).
  • Measurement of oSRTs and WRS in subjects fitted via subjective methods.
  • Classification of CI users into groups based on oSRT relative to a normal-hearing reference range.
  • Alternative fitting using eSRTs in a subset of 15 CI users, followed by WRS re-evaluation.

Main Results:

  • CI users with oSRTs within the reference range demonstrated significantly better WRS (mean 53%) compared to those with oSRTs outside the range (mean 30%).
  • Electrically evoked stapedius reflex threshold (eSRT)-based fitting led to improvements in mean WRS for both groups.

Conclusions:

  • oSRTs deviating from the normal range indicate potential under- or overstimulation and are linked to reduced speech perception.
  • eSRT-based fitting improves speech outcomes, suggesting its utility for optimizing CI stimulation even in users with seemingly adequate subjective fittings.
  • Incorporating objective measures like oSRT and eSRT into routine CI fitting procedures holds significant potential for enhancing patient results.