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Bimodal Hearing or Bilateral Cochlear Implants? Ask the Patient.

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Current clinical tests struggle to differentiate bimodal and bilateral cochlear implant (CI) users. A complex listening environment like R-SPACE or patient self-assessment is more effective for determining CI candidacy and benefit.

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Area of Science:

  • Audiology
  • Otorhinolaryngology
  • Biomedical Engineering

Background:

  • Bimodal cochlear implant (CI) users have one CI and one natural ear, while bilateral CI users have two CIs.
  • Distinguishing performance between these groups is crucial for candidacy decisions.
  • Current clinical measures may not adequately capture differences in speech understanding.

Purpose of the Study:

  • To evaluate speech understanding measures for differentiating bimodal and bilateral CI recipients.
  • To identify effective tools for guiding bilateral CI candidacy decisions.

Main Methods:

  • Cross-sectional study of 85 adult CI recipients (49 bimodal, 36 bilateral).
  • Speech recognition assessed using standard clinical tests and an R-SPACE sound-simulation system.
  • Participants tested in single-ear and bilateral/bimodal conditions.

Main Results:

  • No significant performance differences between bimodal and bilateral CI users on standard clinical tests.
  • R-SPACE system revealed superior performance and binaural summation in bilateral CI users.
  • Patient self-report on needing a second CI showed high sensitivity for identifying candidates.

Conclusions:

  • Standard clinical speech tests are insufficient for determining bilateral CI candidacy.
  • Complex listening environments (R-SPACE) are more sensitive for assessing candidacy and benefit.
  • Patient self-assessment is a valuable, albeit less specific, clinical tool when advanced systems are unavailable.