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Updated: Aug 31, 2025

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
06:04

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Published on: March 24, 2023

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Longitudinal Speech Recognition Changes After Cochlear Implant: Systematic Review and Meta-analysis.

Cheng Ma1, Jacob Fried1, Shaun A Nguyen1

  • 1Department of Otolaryngology-Head and Neck Surgery, Medical University of South Carolina, Charleston, South Carolina, U.S.A.

The Laryngoscope
|August 25, 2022
PubMed
Summary

Cochlear implants significantly improve speech recognition in adults within 3 months, with no further gains observed later. Individual results vary, necessitating further research into these differences.

Keywords:
cochlear implantslongitudinalmeta-analysispostlingual hearing lossspeech recognitionsystematic review

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Area of Science:

  • Audiology
  • Otolaryngology
  • Neuroscience

Background:

  • Adults with postlingual hearing loss often experience significant communication challenges.
  • Cochlear implantation is a key intervention for restoring hearing in this population.
  • Understanding speech recognition changes post-implantation is crucial for managing expectations and optimizing outcomes.

Approach:

  • A systematic review and meta-analysis was conducted.
  • Included 22 English-language articles with 1954 adult cochlear implant recipients.
  • Analyzed speech recognition scores at pre-implantation and multiple post-implantation time points.

Key Points:

  • Significant improvements in speech recognition (words, sentences in quiet/noise) were observed within 3 months post-implantation.
  • Consonant-Nucleus-Consonant (CNC) words, Hearing In Noise Test (HINT), and AzBio sentences showed marked gains.
  • Hearing In Noise Test (HINT) sentences in noise also improved significantly between 3 and 12 months.

Conclusions:

  • Speech recognition scores in cochlear implant recipients significantly improve within the first 3 months.
  • No statistically significant further improvements were noted after 3 months.
  • Substantial individual variability in outcomes necessitates further investigation into influencing factors.