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Frequency-to-Place Mismatch and Cochlear Implant Outcomes by Electrode Type.

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Summary

Frequency-to-place mismatch impacts cochlear implant (CI) speech recognition, particularly with precurved electrode arrays. Daily device use and time since activation significantly improve outcomes for all CI users.

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Area of Science:

  • Otolaryngology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Speech recognition in cochlear implant (CI) users shows significant variability.
  • Frequency-to-place mismatch, a discrepancy in cochlear tonotopic organization and electrode allocation, is a potential factor influencing CI outcomes.

Purpose of the Study:

  • To evaluate the association between frequency-to-place mismatch and speech recognition in postlingually deafened adult CI users.
  • To control for known clinical factors affecting CI-aided speech recognition outcomes.

Main Methods:

  • Retrospective cohort study of 498 cochlear implants from 447 adult CI users (2016-2023).
  • Consonant-Nucleus-Consonant (CNC) monosyllabic word recognition test as the primary outcome measure.
  • Analysis included frequency-to-place mismatch, electrode array type, device use, and time since CI activation.

Main Results:

  • Frequency-to-place mismatch negatively correlated with speech recognition, but only for precurved electrode arrays.
  • For straight electrode arrays, only time since activation and daily device use correlated with improved word recognition.
  • For precurved arrays, mismatch at 1500 Hz, scalar location, time since activation, and daily device use were significantly associated with improved word recognition.

Conclusions:

  • Daily device use and time since CI activation are key to improved speech recognition for all CI users.
  • Frequency-to-place mismatch and scalar location impact word recognition primarily in patients with precurved electrode arrays.
  • Adaptation may help overcome mismatch in straight arrays, while precurved arrays may require more than just adaptation to mitigate placement factors.