Assessment evaluation of transient evoked otoacoustic emission by contralateral suppression in tinnitus patient with normal hearing
Background and Aim: Subjective tinnitus etiology has not been fully understood. Recently, in normal hearing subject one of the tinnitus theories, more specifically the medial olivocochlear tract, is related to the dysfunction of the efferent auditory system. The aim of this study was to determine the potential contribution of a defective cochlear efferent innervations to the chronic tinnitus in patients with normal hearing and determine the relation between tinnitus loudness and the amount of suppression of the transient evoked otoacoustic emission.
Methods: This study was conducted on 20 tinnitus patients aged between 20-45 years and 20 controls matched for age and gender in School of Rehabilitation, Tehran University of Medical Sciences. Transient otoacoustic emission testing without and with contralateral white noise at 55 and 65 dB was performed on each subject.
Results: The amplitudes of the emissions in the two groups was significantly different (p=0.001), but no correlation between tinnitus loudness and the amplitudes of the emissions in the presence (p=0.3) and absence (p=0.06) of contralateral noise.
Conclusion: The suppression of the transient evoked otoacoustic emission by contralateral white noise did not reach statistically significant levels in tinnitus patients while the amplitude in control group reduced significantly.
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