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Auditory brainstem evoked potentials in blast injury.

H Pratt, M Goldsher, A Netzer

    Audiology : Official Organ of the International Society of Audiology
    |January 1, 1985
    PubMed
    Summary
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    Blast injuries cause mixed hearing loss. Auditory brainstem evoked potentials (ABEP) can differentiate temporary from permanent hearing effects, correlating with blast-induced conductive and sensorineural impairments.

    Area of Science:

    • Audiology
    • Neuroscience
    • Trauma Medicine

    Background:

    • Blast injuries commonly result in mixed hearing loss, encompassing both conductive and sensorineural components.
    • The sensorineural aspect of blast-induced hearing loss can manifest as temporary threshold shifts (TTS) and permanent threshold elevations.
    • Auditory brainstem evoked potentials (ABEP) are established electrophysiological measures sensitive to auditory pathway function.

    Purpose of the Study:

    • To investigate the utility of Auditory Brainstem Evoked Potentials (ABEP) in characterizing hearing loss following blast injury.
    • To correlate ABEP latency measures with clinical findings in blast survivors.
    • To determine if ABEP can differentiate between temporary and permanent effects of blast exposure on hearing.

    Main Methods:

    Related Experiment Videos

    • ABEP were recorded from 37 individuals with a history of blast exposure.
    • Latency measures from ABEP recordings were analyzed and correlated with audiological assessments.
    • Clinical findings related to hearing loss were compared with electrophysiological data.

    Main Results:

    • Prolongation of ABEP peak latencies was observed and found to correlate with the conductive component of hearing loss.
    • Increased ABEP latencies also correlated with the temporary threshold shift (TTS) component of sensorineural hearing loss.
    • No evidence of central auditory system dysfunction attributable to blast injury was detected via ABEP.

    Conclusions:

    • ABEP measurements are objective indicators of auditory system changes after blast exposure.
    • ABEP latency prolongation is associated with both conductive and temporary sensorineural hearing loss components.
    • ABEP show potential for distinguishing between the transient and lasting auditory effects of blast injuries.