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Brain stem evoked response audiometry in neonates.

A K Mandal, Y N Mehra, A Narang

    Indian Pediatrics
    |June 1, 1989
    PubMed
    Summary
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    Brain stem evoked response audiometry (BERA) provides objective hearing screening for newborns. This study established normative BERA data, confirming its reliability for assessing infant hearing.

    Area of Science:

    • Neuroscience
    • Audiology
    • Pediatrics

    Background:

    • Neonatal hearing screening is crucial for early detection of auditory impairments.
    • Brain stem evoked response audiometry (BERA) is a non-invasive electrophysiological test.
    • Establishing normative data for BERA in newborns is essential for accurate interpretation.

    Purpose of the Study:

    • To generate normative brain stem auditory evoked response (BAER) data for normal-term newborns.
    • To assess the reliability and objectivity of BERA for neonatal hearing screening.
    • To investigate the effect of stimulus intensity on BERA parameters in neonates.

    Main Methods:

    • BERA was performed on 50 healthy, full-term newborns (25 male, 25 female).
    • Auditory stimuli at 30, 40, and 80 dB nHL were presented.

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  • Absolute latencies of waves I and V, and I-V interpeak latencies (IPL) were recorded.

    • Main Results:

    • Waves I, III, and V were commonly observed; 30 dB stimulus was insufficient for clear patterns.
    • Wave I and V latencies decreased with increasing stimulus intensity (0.012 msec/dB).
    • I-V IPL (central conduction time) remained constant across tested intensities; no sex differences were found.

    Conclusions:

    • BERA is an objective and reliable method for hearing screening in neonates.
    • Normative BERA data were established for the newborn age group.
    • The findings support the use of BERA for early identification of hearing loss in infants.