CC-BY-NC-ND 4.0 · Int Arch Otorhinolaryngol 2017; 21(04): 318-322
DOI: 10.1055/s-0037-1598243
Original Research
Thieme Revinter Publicações Ltda Rio de Janeiro, Brazil

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

Pricila Sleifer
1  Department of Human Health and Communication, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
,
Dayane Domeneghini Didoné
2  Child and Adolescent Health Program, Universidade Federal do Rio Grande do Sul Ringgold Standard Institution, Porto Alegre, Rio Grande do Sul, Brazil
,
Ísis Bicca Keppeler
1  Department of Human Health and Communication, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
,
Claudine Devicari Bueno
1  Department of Human Health and Communication, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
,
Rudimar dos Santos Riesgo
3  Child Neurology Unit (HCPA-UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
› Author Affiliations
Further Information

Publication History

22 June 2016

21 December 2016

Publication Date:
13 February 2017 (eFirst)

Abstract

Introduction The tone-evoked auditory brainstem responses (tone-ABR) enable the differential diagnosis in the evaluation of children until 12 months of age, including those with external and/or middle ear malformations. The use of auditory stimuli with frequency specificity by air and bone conduction allows characterization of hearing profile.

Objective The objective of our study was to compare the results obtained in tone-ABR by air and bone conduction in children until 12 months, with agenesis of the external auditory canal.

Method The study was cross-sectional, observational, individual, and contemporary. We conducted the research with tone-ABR by air and bone conduction in the frequencies of 500 Hz and 2000 Hz in 32 children, 23 boys, from one to 12 months old, with agenesis of the external auditory canal.

Results The tone-ABR thresholds were significantly elevated for air conduction in the frequencies of 500 Hz and 2000 Hz, while the thresholds of bone conduction had normal values in both ears. We found no statistically significant difference between genders and ears for most of the comparisons.

Conclusion The thresholds obtained by bone conduction did not alter the thresholds in children with conductive hearing loss. However, the conductive hearing loss alter all thresholds by air conduction. The tone-ABR by bone conduction is an important tool for assessing cochlear integrity in children with agenesis of the external auditory canal under 12 months.