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Related Experiment Videos

Stapedius reflex threshold in cochlear implant patients.

K Stephan1, K Welzl-Müller, H Stiglbrunner

  • 1Clinic for Hearing, Speech and Voice Disorders, University of Innsbruck, Austria.

Audiology : Official Organ of the International Society of Audiology
|January 1, 1988
PubMed
Summary

The stapedius reflex, important for cochlear implant users, was measured using electrostimulation. This method helps adjust speech processors for patients with hearing loss.

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Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • The stapedius reflex is a crucial indicator of middle ear function.
  • Cochlear implants (CIs) can elicit this reflex via electrical stimulation.
  • Assessing this reflex aids in optimizing CI sound processing.

Purpose of the Study:

  • To investigate the contralateral stapedius reflex elicited by electrostimulation in CI patients.
  • To evaluate the feasibility of using this reflex for audiological assessment.
  • To determine the reflex threshold in relation to loudness levels.

Main Methods:

  • Electrostimulation via cochlear implant in 12 patients.
  • Monitoring middle ear muscle contraction via impedance change.
  • Time-resolved synchronized digital sampling for precise measurements.

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Main Results:

  • The stapedius reflex was detected in all patients with intact middle ear function who reached uncomfortable loudness levels (UCLL).
  • The reflex threshold was typically found between most comfortable loudness (MCL) and UCLL.
  • This indicates the reflex is measurable within the dynamic range of CI users.

Conclusions:

  • The contralateral stapedius reflex can be reliably elicited and measured in CI patients.
  • This method offers a valuable tool for audiological assessment, particularly for difficult-to-test individuals.
  • It may assist in fine-tuning speech processor settings for improved patient outcomes.