Noise-induced hearing loss and distortion product otoacoustic emissions: Two exemplary cases
DOI:
https://doi.org/10.34631/sporl.152Keywords:
Noise-induced hearing loss, Firearms, Irrigation, Pure-tone audiometry, Distortion product otoacoustic emissions, TinnitusAbstract
This paper describes two case reports of patients with noiseinduced hearing loss: the first was caused by the repeated exposure to skeet shooting sports; in the second case the hearing loss was caused by using a oral jet irrigator for removal of cerumen of the external auditory canal.
In both cases, the evaluation with otoacoustic emissions added diagnostic information to conventional audiometry: in the case of hearing loss associated with the shooting sports, otoacoustic emissions demonstrated that the cochlear lesion was asymmetrical, contrarily to the results of the pure tone audiometry; in the case of hearing loss caused by irrigation of the ear canal, otoacoustic emissions demonstrated that the cochlear damage extended to more frequencies than those identified in the pure tone audiogram.
The cases demonstrate the utility of otoacoustic emissions in the complete audiological diagnosis. In addition, each of the cases had a particular educative implication: the first case demonstrate that cochlear injury in shooting practice may be greater on the side where the shotgun is supported, contrarily to what is usually believed; the second case demonstrate that jet irrigation can cause acute noise-induced injury of the ear, with irreversible sensorineural hearing loss.
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