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Newborn hearing thresholds measured by both insert and earphone methods

R Galambos1, M Wilson

  • 1Children's Hospital, San Diego, California.

Journal of the American Academy of Audiology
|March 1, 1994
PubMed
Summary
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Auditory brainstem response (ABR) testing in newborns shows minimal differences in hearing threshold measurements between insert earphones and traditional earphones. This suggests earphones do not artificially inflate conductive hearing loss findings.

Area of Science:

  • Audiology
  • Neuroscience
  • Pediatrics

Background:

  • Accurate hearing assessment in newborns is crucial for early intervention.
  • The Auditory Brainstem Response (ABR) is a key diagnostic tool for infant hearing.
  • Concerns exist regarding potential ear canal collapse with earphone use during ABR.

Purpose of the Study:

  • To compare ABR absolute thresholds obtained using insert earphones versus traditional earphones in newborns.
  • To evaluate if earphone use artifactually impacts conductive hearing loss measurements.

Main Methods:

  • Auditory Brainstem Response (ABR) absolute thresholds were measured in 28 newborns (31 ears).
  • Stimuli were delivered using both insert earphones and traditional earphones within a single session.

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  • Thresholds from both methods were compared for each ear.

    • Main Results:

    • The ABR threshold estimates from the two methods differed by 10 dB or less in all tested ears.
    • This indicates high agreement between insert and earphone measurements.

    Conclusions:

    • Insert earphones and traditional earphones yield comparable ABR thresholds in newborns.
    • Earphone use during ABR testing is unlikely to cause significant artificial conductive hearing loss due to ear canal collapse.