introduction: tinnitus is a perception of sound without external source. the exact etiology of tinnitus is not fully understood, although some researchers believe that the condition usually starts in the cochlea. the aim of this study was to determine the potential contribution of outer hair cell dysfunction to chronic tinnitus, by application of distortion-product evoked otoacoustic emission (...

Introduction The most commonly used method in neonatal hearing screening programs is transient evoked otoacoustic emissions in the first stage of the process. There are few studies comparing transient evoked otoacoustic emissions with distortion product, but some authors have investigated the issue. Objective To correlate the results of transient evoked and distortion product otoacoustic emissi...

OBJECTIVE To determine whether there is any influence of systemic arterial hypertension on the peripheral auditory system. METHODS This was a cross-sectional study that investigated 40 individuals between 30 and 50 years old, who were divided into groups with and without systemic arterial hypertension, using data from high-frequency audiometry, transient-evoked otoacoustic emissions and disto...

PURPOSE To present a case study in order to alert clinicians to the possibility of occurrence of intermodulation distortion during otoacoustic emissions testing that arises from the cavity formed by the external auditory meatus and tympanic membrane rather than from the inner ear, compromising the reliability and validity of otoacoustic emissions testing. RESEARCH DESIGN Prospective case stud...

Thirty patients with temporo-mandibular joint dysfunction were selected to investigate the changes in otoacoustic emissions before and after conservative treatment of their temporo-mandibular joints. Pure tone audiometry, transient-evoked otoacoustic emissions (TEOAE), distortion-product otoacoustic emissions (DPOAE) as well as a tinnitus questionnaire were administered to all patients before a...

UNLABELLED Transient evoked otoacoustic emissions and distortion product otoacoustic emissions have gained significant importance in the identification of cochlear alterations. AIM To record distortion product thresholds through the monitoring of otoacoustic emissions in normal conditions and in the presence of electrophysiologic changes in cochlear outer hair cells in sheep after hyperinsuli...

product (DP), distortion-product “audiogram” (DP-gram), distortion-product OAE (DPOAE), fine structure, fast Fourier transform (FFT), input/output (I/O), inverse FFT (IFFT), magnitude and phase, medial olivocochlear (MOC), otoacoustic emissions (OAE), outer hair cell (OHC), polar plot, reflection, signal-to-noise ratio (SNR), spontaneous OAE (SOAE), stimulus-frequency OAE (SFOAE), transient-evo...

UNLABELLED Exposure to loud music is increasing among young people, and so could be the number of hearing impairment cases in this population. Otoacoustic emission tests are sensitive in capturing the effects of exposure to noise, and allow the detection of early cochlear disorders. OBJECTIVE This study aims to look into the prevalence rates of injuries to outer hair cells in a population of ...