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Audiometric Pattern in Moderate and Severe Tympanic Membrane Retraction.

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Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
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This study found that severe tympanic membrane retraction, especially in the pars tensa, correlates with worse hearing thresholds. Pars tensa retraction is associated with a higher air-bone gap, indicating potential hearing loss.

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Area of Science:

  • Otolaryngology
  • Audiology
  • Medical Imaging

Background:

  • Tympanic membrane (TM) retraction, a common otological condition, can range from mild to severe.
  • The impact of moderate to severe TM retractions on hearing thresholds requires further clarification.
  • Understanding the correlation between otoscopic findings and audiometric patterns is crucial for patient management.

Purpose of the Study:

  • To evaluate the audiometric patterns associated with moderate to severe tympanic membrane retractions.
  • To correlate the severity of otoscopic findings of TM retraction with audiometric measurements.
  • To investigate differences in hearing thresholds based on the location and severity of TM retraction.

Main Methods:

  • A cross-sectional study was conducted involving 451 ears with moderate or severe TM retraction.
  • Patients with prior ear surgery or middle ear effusion were excluded.
  • Pure-tone audiometry was performed to measure air conduction (AC) and bone conduction (BC) thresholds, and air-bone gap (ABG) at a four-frequency pure-tone average.

Main Results:

  • The median air-bone gap (ABG) was 12.5 dB HL, with 72% of ears having an ABG ≤ 20 dB HL.
  • Retraction of the pars tensa (PT) showed a moderate correlation with worsening AC and ABG thresholds.
  • Pars flaccida (PF) retraction was associated with a lower median ABG compared to PT retraction.

Conclusions:

  • Moderate to severe tympanic membrane retraction, particularly involving the pars tensa, is correlated with impaired hearing thresholds.
  • The severity of pars tensa retraction significantly correlates with worsening air conduction and air-bone gap.
  • Pars tensa involvement in retraction leads to a higher median air-bone gap compared to pars flaccida retraction.