Acoustic Reflexes in Individuals Having Hyperacusis of the Auditory Origin
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ORIGINAL ARTICLE
Acoustic Reflexes in Individuals Having Hyperacusis of the Auditory Origin Udit Saxena1,2 • Bhanu Pratap Singh3 • S. B. Rathna Kumar4 • Gish Chacko1 K. N. S. V. Bharath5
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Received: 25 June 2020 / Accepted: 22 July 2020 Ó Association of Otolaryngologists of India 2020
Abstract Functional role of the acoustic reflex in preventing over stimulation of the inner auditory system by decreasing sound intensity along with the previous reports of acoustic reflex abnormalities in individuals having hyperacusis point towards the involvement of acoustic reflex deficit in the origin of hyperacusis especially when any medical condition leading to hyperacusis is not associated. However this issue remains contradictory owing to limited comprehensive investigation. This study was undertaken to ascertain the relationship between hyperacusis and the acoustic reflex. Threshold, amplitude and latency of the acoustic reflex were measured in two different groups of individuals having hyperacusis; Group 1: 14 individuals having hyperacusis with hearing loss (HwHL) and Group 2: 17 individuals having hyperacusis without hearing loss (HwoHL). Control group (Group 3) consisted of 15 normal hearing individuals who never experienced hyperacusis. Result showed a significant group effect on all the measured characteristics of the acoustic Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12070-020-02002-9) contains supplementary material, which is available to authorized users. & Udit Saxena [email protected] 1
MAA Institute of Speech and Hearing, Osmania University, Hyderabad, India
2
Department (Speech and Hearing), MAA ENT Hospital, Hyderabad, India
3
Department of ENT, Hind Institute of Medical Sciences, Uttar Pradesh, Sitapur, India
4
Ali Yavar Jung National Institute of Speech and Hearing Disabilities (Divyangjan), Mumbai, India
5
MAA ENT Hospital, Hyderabad, India
reflex. ARTs were found to be significantly higher in HwHL and HwoHL when compared to NHwoH. ARTs were statistically similar for HwoHL and NHwoH. HwoHL’s ARAs and ARLs were significantly smaller and prolonged, respectively, when compared to HwHL and NHwoH. HwHL and NHwoH had statistically similar ARAs and ARLs. This study confirms acoustic reflex abnormalities in some individuals having hyperacusis with or without hearing loss. It further highlight the importance of involving acoustic reflex testing in the assessment of hyperacusis especially when hyperacusis is not associated with hearing loss or any other medical condition that may lead to hyperacusis. Keywords Hyperacusis Acoustic reflexes Threshold Latency Amplitude
Introduction Hyperacusis is one of the most arguable topics in hearing sciences. The phenomena, its definition, site of origin, assessment and management are yet not conclusive [1]. Defined differently by authors, hyperacusis refers to an auditory dysfunction in which the sufferers are over sensitive to sound [1–4]. Individuals having hyperacusis report themselves uncomfortable, hype
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