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Related Experiment Videos

Effect of changes in mass on middle ear function

S Nishihara1, H Aritomo, R L Goode

  • 1Division of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, Palo Alto, California.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|November 1, 1993
PubMed
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Adding or removing mass from the middle ear significantly impacts hearing. Mass addition generally harms sound transmission, while mass reduction can improve it, especially in specific frequency ranges.

Area of Science:

  • Otolaryngology
  • Bioacoustics
  • Biophysics

Background:

  • Middle ear vibrating systems are sensitive to mass alterations.
  • Post-surgical or disease-related mass changes can affect hearing thresholds.

Purpose of the Study:

  • To investigate the effects of adding or reducing mass on the middle ear's transfer function.
  • To quantify the impact of mass variations on sound transmission and stapes displacement.

Main Methods:

  • Experiments conducted on 15 human temporal bones.
  • Laser Doppler Vibrometer used to measure stapes and umbo vibration.
  • Varying masses added/removed from tympanic membrane and ossicular chain across a wide frequency range (147-19433 Hz).

Main Results:

Related Experiment Videos

  • Mass addition to the tympanic membrane had detrimental effects, varying with location and amount.
  • Ventilation tubes (12-17 mg) caused hearing loss at 1.5-5.0 kHz.
  • Mass on umbo/malleus and incus/stapes reduced mid-to-high frequency transmission and stapes displacement.
  • Epithelium removal (mass reduction) increased sound transmission, particularly at 2.0-4.0 kHz.

Conclusions:

  • Middle ear mass significantly influences sound transmission efficiency.
  • Strategic mass reduction may enhance sound transmission, while additions generally impair it.
  • Findings are relevant for understanding postoperative hearing changes and surgical interventions.