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High frequency immittance for neonates: a normative study.

De Wet Swanepoel1, Sonia Werner, René Hugo

  • 1Department of Communication Pathology, University of Pretoria, South Africa. dewet.swanepoel@up.ac.za

Acta Oto-Laryngologica
|March 17, 2007
PubMed
Summary

High frequency immittance measurements show promise for assessing neonatal middle ear status. Consulting age- and gender-specific norms is crucial for accurate interpretation of these auditory assessments in newborns.

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Area of Science:

  • Audiology
  • Neonatal Medicine
  • Otolaryngology

Background:

  • Accurate assessment of middle ear status in neonates is critical for early detection of hearing impairments.
  • Traditional immittance measurements may have limitations in the neonatal population.
  • High-frequency probe tones offer potential for improved diagnostic capabilities.

Purpose of the Study:

  • To establish normative data for high-frequency (1000 Hz) immittance measurements in neonates.
  • To define tympanometric and acoustic reflex criteria for neonatal ears.
  • To evaluate the efficacy of high-frequency immittance in identifying middle ear effusion.

Main Methods:

  • Conducted 1000 Hz probe tone immittance measurements (tympanograms, acoustic reflexes) on 278 neonatal ears (0-4 weeks).

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  • Included distortion product oto-acoustic emission (DPOAE) screening for comparison.
  • Compiled normative values for immittance measures in ears with normal middle ear function (n=250).

    • Main Results:

    • High-frequency tympanometry showed 57% sensitivity and 95% specificity for middle ear fluid.
    • Acoustic reflex measures yielded 57% sensitivity and 90% specificity.
    • Normative data revealed significant age and gender differences in static peak admittance and tympanic peak pressure.

    Conclusions:

    • High-frequency immittance measurements are a promising tool for neonatal middle ear assessment.
    • Established normative values provide a benchmark for interpreting results.
    • Age- and gender-specific norms are essential for accurate clinical application in neonates.