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Air and Bone Conduction Frequency-specific Auditory Brainstem Response in Children with Agenesis of the External

Pricila Sleifer1, Dayane Domeneghini Didoné2, Ísis Bicca Keppeler1

  • 1Department of Human Health and Communication, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.

International Archives of Otorhinolaryngology
|October 12, 2017
PubMed

Insights

Tone-evoked auditory brainstem responses (tone-ABR) using bone conduction accurately assess cochlear function in infants with external auditory canal agenesis. Air conduction thresholds were elevated, confirming conductive hearing loss in these children.

Area of Science:

  • Audiology
  • Pediatric Otolaryngology
  • Neuroscience

Background:

  • Tone-evoked auditory brainstem responses (tone-ABR) are crucial for diagnosing hearing issues in infants up to 12 months.
  • External and middle ear malformations can complicate hearing assessments in young children.
  • Frequency-specific auditory stimuli via air and bone conduction aid in detailed hearing profile characterization.

Purpose of the Study:

  • To compare tone-ABR results using air and bone conduction in infants under 12 months with external auditory canal agenesis.
  • To evaluate the effectiveness of bone conduction tone-ABR in assessing cochlear integrity in this specific pediatric population.

Main Methods:

  • A cross-sectional, observational study involving 32 children (1-12 months old) with external auditory canal agenesis.
  • Tone-ABR testing was performed using air and bone conduction at 500 Hz and 2000 Hz.
  • Data analysis focused on comparing thresholds between air and bone conduction, and between genders and ears.

Main Results:

  • Significantly elevated tone-ABR thresholds were observed for air conduction at 500 Hz and 2000 Hz.
  • Bone conduction tone-ABR thresholds remained within normal limits for both ears.
  • No significant differences in thresholds were found between genders or between the left and right ears for most comparisons.

Conclusions:

  • Bone conduction tone-ABR effectively assesses cochlear integrity in infants with external auditory canal agenesis.
  • Conductive hearing loss, indicated by elevated air conduction thresholds, does not impact bone conduction thresholds in this cohort.
  • Tone-ABR via bone conduction is a valuable diagnostic tool for this specific group of infants.

Keywords:
auditorybone conductionconductivecongenital abnormalitiesearevoked potentialsexternalhearing loss

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