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Sweep frequency impedance measures in young infants: developmental characteristics from birth to 6 months

Venkatesh Aithal1,2, Joseph Kei2, Carlie Driscoll2

  • 1a Department of Audiology , Townsville Hospital and Health Service , Douglas , QLD , Australia.

International Journal of Audiology
|October 27, 2016
PubMed

Insights

Sweep frequency impedance (SFI) measures show developmental changes in infants up to 6 months. Outer ear resonance frequency increases, while mobility decreases, aiding in infant ear function evaluation.

Area of Science:

  • Audiology and Otolaryngology
  • Infant Auditory Development
  • Bioimpedance Measurement

Background:

  • Early identification of auditory system development is crucial for timely intervention.
  • Understanding normative data for auditory function in infants is essential for accurate diagnosis.
  • Sweep Frequency Impedance (SFI) offers a method to assess outer and middle ear characteristics.

Purpose of the Study:

  • To investigate the developmental trajectory of SFI measures in healthy infants from birth to 6 months.
  • To establish preliminary normative data for SFI parameters in early infancy.
  • To determine age-related changes in outer and middle ear impedance characteristics.

Main Methods:

  • A cohort of 83 healthy infants (117 ears) aged 0-6 months were evaluated.
  • High-frequency tympanometry (HFT), distortion product otoacoustic emissions (DPOAE), and SFI tests were performed.
  • SFI measures included resonance frequency (RF) and mobility (ΔSPL); data analyzed using mixed-model ANOVA.

Main Results:

  • Outer ear resonance frequency (RF) significantly increased from 279 Hz at birth to 545 Hz at 4 months.
  • Outer ear mobility (ΔSPL) significantly decreased from 7.9 dB at birth to 3.7 dB at 4 months.
  • Middle ear RF and ΔSPL showed no significant age-related changes up to 6 months.

Conclusions:

  • Developmental characteristics of SFI measures must be considered when assessing infant ear function.
  • Preliminary normative SFI data for infants aged 0-6 months are provided.
  • These findings can aid in the evaluation of outer and middle ear function in young infants.
Abstract

Keywords:
Electrophysiologyinstrumentationmiddle earpaediatricsweep frequency impedance

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