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Related Experiment Videos

Real-Ear to coupler difference in patients with ear drum perforation.

T C Liu1, K N Lin

  • 1Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan. liuent@ha.mc.ntu.edu.tw

ORL; Journal for Oto-Rhino-Laryngology and Its Related Specialties
|November 5, 1999
PubMed
Summary

Ear drum perforations can reduce real-ear to coupler difference (RECD) by up to 8 dB at low frequencies. Individual RECD measurements are crucial for accurate hearing aid fitting in these patients.

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Area of Science:

  • Audiology
  • Acoustics
  • Otology

Background:

  • Real-ear to coupler difference (RECD) is essential for accurate hearing aid fitting.
  • Ear drum perforations can alter the acoustic properties of the ear canal.

Purpose of the Study:

  • To investigate the impact of ear drum perforations on RECD in adults.
  • To determine if RECD measurements need adjustment for individuals with perforated eardrums.

Main Methods:

  • RECD was measured in 22 adults with ear drum perforations and 22 normal-hearing controls.
  • A probe tube microphone system was used for RECD measurements.
  • Measurements were taken across various frequencies.

Main Results:

  • Perforated ears showed RECD values up to 8 dB smaller between 0.5 and 1 kHz compared to controls.

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  • No significant RECD differences were observed below 0.25 kHz or above 1 kHz.
  • Intersubject variability in RECD was significantly higher in the perforated group (4.4 dB SD) than the control group (2.2 dB SD).

    • Conclusions:

    • Ear drum perforations significantly affect RECD at lower frequencies, necessitating individualized measurements.
    • Standard RECD values may not be appropriate for hearing aid fitting in patients with perforated eardrums.
    • Individual RECD assessment is recommended to ensure optimal amplification and sound transmission for these patients.