![]() ![]() The mere presence or absence of OAEs cannot estimate the type and degree of hearing loss, as OAEs are not a test of hearing. However, OAEs are susceptible to noise, and may be compromised via excessive cerumen, and a variety of middle ear anomalies (otitis media, ossicular discontinuity, otosclerosis, perforated tympanic membrane, etc). Further, OAEs are relatively inexpensive and do not require a sound-treated booth. OAEs are highly sensitive and highly dependent on outer hair cell function, they do not require behavioral responses, and they offer immediate, ear-specific results. OAEs offer many advantages with regard to screening (pass/fail) and diagnostic (adding to the differential diagnosis) applications. Thus, screening and diagnostic OAEs serve important and distinct roles in the differential diagnosis of hearing loss. OAEs also can be used as a sophisticated diagnostic test. ![]() 3 Therefore, OAEs can be used as a screening tool to determine if the cochlea is responding to sound in a typical fashion. The OAE itself is thought to have an amplitude that may vary from -10 dB SPL to +30 dB SPL in healthy ears. These acoustic sounds from the cochlea can be measured from the external auditory canal, given a clean and healthy external auditory canal, as well as a healthy and normal functioning middle ear. OAEs may therefore be considered acoustic sounds that originate secondary to movement of the cochlea’s hair cells. In mammals, the electromotile response occurs essentially from the conversion of electrical energy into mechanical energy. This process is referred to as an electromotile response. In response to stimulation, the outer hair cells change their shape to preferentially amplify and propagate particular sounds along the basilar membrane. 1 In brief, as sound is introduced within a healthy (ie, normal hearing and functioning) cochlea, the stereocilia of the outer hair cells are stimulated. Otoacoustic emissions (OAEs) were first reported by Kemp. Beck, AuDĪ review of OAE concepts, the application of screening versus diagnostic OAEs, as well as normative data to help clinicians in the interpretation of DPOAEs for the Interacoustics Titan DPOAE440 module. By Jessica Arrue Ramos, MAudSt, MAudSA (CCP) Sinnet Greve Bjerge Kristensen, MA and Douglas L. ![]()
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