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Home > Archives > Volume 20, No 8 (2022) > Article

DOI: 10.14704/nq.2022.20.8.NQ44725

Absolute and Predicted Hearing Thresholds of Broadband Chirp-Auditory Brainstem Response in Adults with Sensorineural Hearing Loss

Dalia Helal Galhoum, Ola Abdallah Ibraheem, Mayada Ahmed Elsaeed, Nadia Mohamed Elnabtity

Abstract

Background: : A CE-Chirp stimulus (named after Claus Elberling inventor) had been developed to compensate for the time delay associated with the cochlear traveling waves. The CE-Chirp evoked auditory brainstem responses (ABRs) are clearer and larger in amplitude than those obtained by click-evoked ABRs. Few or no data are available about the absolute and predicted hearing threshold using chirp evoked-ABR. Aim: This study aims to evaluate the absolute and predicted hearing thresholds using broad-band chirp (BBC) stimuli and to examine the relationship between the BBCABR and behavioral hearing thresholds in normal-hearing adults and those with different degrees and configurations of sensorineural hearing loss (SNHL).Subjects and Methods: The study involved a control group of 50 adults (18-50 years) with normal hearing and age- and gender-matched study group of 50 participants with variable degrees and configurations of SNHL. All participants were examined for basic audiological evaluation and BBC-ABR.Results: The BBC-ABR threshold showed the best correlation with the 0.5-4 kHz pure-tone average threshold. The mean difference of the BBC-ABR threshold versus the 0.5-4 kHz pure-tone average threshold showed a non-significant difference between normal hearing and different degrees and configurations of hearing loss except for a significantly lower difference at a severe hearing loss. There were moderate to strong correlations between the BBC-ABR and the 0.5-4 kHz pure-tone average threshold across different degrees and configurations of hearing loss. Uniquely, a regression equation y = -17.65 + (1*x) has been estimated to predict the 0.5-4 kHz pure-tone average threshold (y) from the BBC-ABR threshold (x). Conclusion: BBC-ABR provides an efficient method for estimating hearing thresholds in individuals with normal hearing and those with SNHL. Therefore, it can be suggested as an objective tool for hearing assessment in difficult-to-test subjects.

Keywords

Broadband-Chirp, SNHL, auditory brainstem response

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