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[Normative parameter characterization for the auditory brainstem response of the normal newborn].

E Echeverría1, L González, M Fischer

  • 1Depto de Fisiología y Biofísica, Facultad de Medicina Universidad de Chile, Santiago.

Revista Medica De Chile
|April 1, 1992
PubMed
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This study on newborn auditory brainstem response found that 85% of infants had hearing thresholds below 40 dBnHL. A screening level of 30-40 dBnHL is suggested for detecting hearing loss in newborns.

Area of Science:

  • Audiology
  • Neuroscience
  • Pediatrics

Context:

  • Newborn hearing screening is crucial for early detection of auditory impairments.
  • Understanding auditory brainstem response (ABR) characteristics in neonates is essential for accurate diagnosis.
  • Variability in ABR thresholds necessitates refined screening protocols.

Purpose:

  • To investigate auditory brainstem response (ABR) thresholds in a cohort of 119 normal newborns.
  • To determine normative ABR latencies for waves I, III, and V.
  • To evaluate the efficacy of different hearing loss screening levels in newborns.

Summary:

  • Auditory brainstem response (ABR) was assessed in 119 newborns using click stimuli at varying intensities (20-60 dBnHL).
  • Mean latencies for waves I, III, and V were 2.7±0.39, 5.4±0.44, and 7.7±0.48 ms, respectively.

Related Experiment Videos

  • 85% of newborns exhibited ABR thresholds <40 dBnHL, with 54% <20 dBnHL and 15% between 40-60 dBnHL, suggesting potential conductive loss in the latter group.

    • Impact:

    • Findings support the use of ABR for identifying hearing impairments in newborns.
    • The study suggests an optimal screening range of 30-40 dBnHL for newborn hearing loss detection.
    • Results contribute to refining audiological assessment protocols for high-risk infant populations.