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Updated: Mar 15, 2026

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Decrease in Middle Ear Resonance Frequency During Pregnancy.

Emine Kutlu Dag1, Cagri Gulumser2, Seyra Erbek1

  • 1Department of Otolaryngology, Head and Neck Surgery, Baskent University , Ankara, Turkey.

Audiology Research
|September 3, 2016
PubMed
Summary
This summary is machine-generated.

Pregnancy is associated with physiological changes, including a decrease in middle ear resonance frequency. This study found significantly lower middle ear resonance in pregnant women compared to non-pregnant individuals.

Keywords:
Pregnancyhearing lossmultifrequency tympanometryresonance frequency

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Area of Science:

  • Otolaryngology
  • Physiology
  • Audiology

Background:

  • Pregnancy involves significant physiological alterations.
  • Changes in the middle ear's acoustic properties during pregnancy are not well understood.

Purpose of the Study:

  • To investigate changes in middle ear resonance frequency during pregnancy.
  • To compare middle ear resonance frequency between pregnant and non-pregnant women.

Main Methods:

  • Prospective case-control study involving 46 pregnant women (third trimester) and 43 non-pregnant controls.
  • Pure-tone audiometry and multifrequency tympanometry were performed on all participants.
  • Analysis included comparison of hearing levels and resonance frequencies, and evaluation of factors like age and weight gain.

Main Results:

  • Pregnant women exhibited significantly higher air conduction thresholds at 250 Hz and 500 Hz.
  • Middle ear resonance frequency was significantly lower in both ears of pregnant women compared to controls.
  • A negative correlation was observed between weight gained during pregnancy and middle ear resonance frequency in the left ear.

Conclusions:

  • Middle ear resonance frequency may decrease during pregnancy.
  • Further longitudinal studies are required to confirm these findings and establish definitive links.