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Related Experiment Videos

Real-ear to coupler differences in children with grommets

H C Martin1, K J Munro, D H Langer

  • 1Hearing & Balance Centre, ISVR, University of Southampton, UK.

British Journal of Audiology
|February 1, 1997
PubMed
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Patent grommets significantly affect real-ear to coupler differences (RECDs) in children, necessitating individualized hearing aid fittings. This study highlights the need for custom RECD measurements, especially for children with grommets, to ensure optimal amplification.

Area of Science:

  • Audiology
  • Pediatric Hearing Healthcare
  • Acoustics

Background:

  • Real-ear to coupler differences (RECDs) are crucial for fitting hearing aids in children with hearing loss.
  • Patent grommets can alter the acoustic properties of the ear canal, potentially impacting RECDs.

Purpose of the Study:

  • To investigate the effect of patent grommets on RECDs in children aged 4-7 years.
  • To determine if grommets necessitate adjustments in hearing aid amplification strategies.

Main Methods:

  • Compared RECDs in 16 children with patent grommets to 16 age-matched controls without middle ear pathology.
  • Utilized otoscopy and tympanometry to confirm grommet status and ear canal volume.
  • Performed real-ear and coupler measurements across various frequencies.

Related Experiment Videos

Main Results:

  • A significant mean RECD difference of 15 dB was observed between groups below 0.75 kHz (P < 0.01).
  • Strong correlations were found between RECD and equivalent ear canal volume at low frequencies (0.125-0.5 kHz).
  • High inter-subject variability in RECDs was noted, with a maximum standard deviation of 6.6 dB at 4.0 kHz.

Conclusions:

  • Individual RECD measurements are essential for children with patent grommets, rather than relying on average values.
  • Hearing aid users with grommets may require increased low-frequency gain to compensate for reduced sound pressure levels due to ear canal leakage.
  • Findings support personalized hearing aid fitting protocols for pediatric populations with middle ear ventilation tubes.