Revisit to the Normative of Otoacoustic Emissions

Abstract

Otoacoustic emissions (OAEs) are acoustic signals generated by the cochlea, providing critical insights into cochlear health and function. This dissertation revisits the normative data for spontaneous (SOAEs), transient evoked (TEOAEs), and distortion product otoacoustic emissions (DPOAEs), which were initially established decades ago. The study addresses the need for updated normative data due to lifestyle changes, including increased environmental noise and the prevalent use of personal listening devices, which potentially impact cochlear function. The study employs the ILO 292 system (Otodynamics, UK, software version 6.41) and the HearID system (Mimosa Acoustics, USA, software version 3.5) to measure OAEs in a sample population. The objectives are to establish the current prevalence and normative amplitudes of SOAEs, TEOAEs, and DPOAEs. The results indicate significant variations in OAE measurements influenced by age, gender, and environmental factors. SOAEs are found in a considerable portion of the population, with higher prevalence in females and younger adults. TEOAEs and DPOAEs show over 90% presence in normal hearing individuals, with amplitude variations linked to stimulus levels and middle ear responses. The updated normative data can enhance the accuracy of clinical audiometry, aiding in the early detection and management of hearing impairments. Furthermore, the study highlights the need for ongoing research to monitor changes in OAE characteristics over time and across different populations. The clinical and research applications of OAEs continue to expand, necessitating precise and current normative data to support effective auditory health assessments.