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Diagnosing cochlear dead regions in children.

Alicja N Malicka1, Kevin J Munro, Richard J Baker

  • 1School of Psychological Sciences, University of Manchester, Manchester, United Kingdom. alicja.malicka@manchester.ac.uk

Ear and Hearing
|November 26, 2009
PubMed
Summary

This study found that dead regions (DRs) in the cochlea can be reliably detected in children using the Threshold Equalizing Noise (TEN) test and fast psychophysical tuning curves (fast-PTCs). Adult criteria for these tests are appropriate for children, aiding in diagnosis and hearing aid fitting.

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Area of Science:

  • Audiology
  • Neuroscience
  • Speech and Hearing Science

Background:

  • Dead regions (DRs) in the cochlea impair speech perception and affect hearing aid benefit.
  • Traditional methods for DR detection (TEN test, PTCs) are established in adults.
  • Children's performance in noise may differ from adults, questioning the applicability of adult criteria for DR diagnosis in pediatric populations.

Purpose of the Study:

  • To evaluate the consistency of the fast-PTC and TEN tests for diagnosing DRs in hearing-impaired children.
  • To assess potential age-related effects by measuring masked thresholds in normal-hearing children using varying TEN levels.

Main Methods:

  • Two groups of children (7-13 years): 8 normal-hearing and 12 hearing-impaired.
  • Masked thresholds in TEN were measured for normal-hearing children across five noise levels (30-70 dB).

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  • Hearing-impaired children underwent TEN testing with noise levels adjusted to their thresholds, validated by fast-PTC measurements.

    • Main Results:

    • Normal-hearing children's masked thresholds were generally below or at the TEN level, indicating no significant age-related effect compared to adults.
    • The TEN test and fast-PTCs showed consistent results in 81% of hearing-impaired children (17/21 ears).
    • Discrepancies occurred in 4 ears, with TEN suggesting a DR when fast-PTC did not, or vice versa.

    Conclusions:

    • The fast-PTC technique and TEN test, using adult criteria, are effective for detecting DRs in children.
    • Confirmation with fast-PTC is recommended when TEN test results indicate a DR with masked thresholds 10-15 dB above the TEN level.
    • These findings support the use of these diagnostic tools for better hearing aid fitting in children with DRs.