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. 2013 Aug;79(4):429-33.
doi: 10.5935/1808-8694.20130077.

Prevalence of auditory neuropathy spectrum disorder in an auditory health care service

[Article in English, Portuguese]
Rosimar Costa Penido  1 , Myriam Lima Isaac
Affiliations

Prevalence of auditory neuropathy spectrum disorder in an auditory health care service

[Article in English, Portuguese]
Rosimar Costa Penido et al. Braz J Otorhinolaryngol. 2013 Aug.

Abstract

Auditory neuropathy spectrum disorder (ANSD) is characterized by impairment of the auditory nerve associated with preservation of outer hair cell function.

Objective: To establish the prevalence of ANSD in subjects with sensorineural hearing loss (SNHL).

Method: This retrospective study was carried out between 2010 and 2012 and included the charts of 2,292 individuals with SNHL. Data from otolaryngological and audiological examinations based on pure-tone and speech audiometry, impedance tests, otoacoustic emissions (OAEs), and brainstem auditory evoked potentials (BAEPs) were collected.

Inclusion criteria: presence of OAEs and/or cochlear microphonic (CM); absent or altered BAEPs, and normal MRI scans of the brain.

Results: Twenty-seven (1.2%) of the 2,292 subjects with SNHL had ANSD (37% males; 63% females). Mild SNHL was seen in 29.6% of the individuals with ANSD; 55.5% had moderate SNHL; 7.4% had severe SNHL; and 7.5% had profound SNHL. In terms of age, 14.8% were aged between zero and 20 years, 44.1% were 41 to 60 years old, and 7.4% were above the age of 60.

Conclusion: ANSD was seen in 1.2% of the individuals with SNHL included in this study.

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Figures

Graph 1
Graph 1
Percent distribution of subjects with auditory neuropathy spectrum disorder (ANSD).
Graph 2
Graph 2
Gender percent distribution of subjects with auditory neuropathy spectrum disorder (ANSD).
Graph 3
Graph 3
Age percent distribution of subjects with auditory neuropathy spectrum disorder (ANSD).
Graph 4
Graph 4
Percent distribution of subjects with auditory neuropathy spectrum disorder (ANSD) according to degree of hearing loss.
Graph 5
Graph 5
Percent distribution of subjects with auditory neuropathy spectrum disorder (ANSD) according to functional gain after fitting of hearing aids.
See this image and copyright information in PMC

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