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Normative values for tympanometry in 7- and 24-month-old children

A Palmu1, H Puhakka, H Huhtala

  • 1National Public Health Institute, Helsinki, Finland.

Audiology : Official Organ of the International Society of Audiology
|August 28, 2001
PubMed

Insights

This study establishes normative tympanometric values for infants, finding static acoustic admittance (SAA) increases with age. Age-specific interpretation is crucial for accurate assessment of children's middle ear function.

Area of Science:

  • Pediatrics
  • Audiology
  • Otolaryngology

Background:

  • Tympanometry is essential for assessing middle ear function in children.
  • Establishing normative data is critical for accurate interpretation of tympanometric variables.

Purpose of the Study:

  • To determine normative values for static acoustic admittance (SAA), tympanometric peak pressure (TPP), and tympanometric width (TW) in 7- and 24-month-old children.
  • To investigate the influence of age, sex, and medical history on these tympanometric variables.

Main Methods:

  • Tympanometry was conducted on 2497 children during a prospective vaccine efficacy trial at 7 and 24 months of age.
  • Analysis included tympanograms from healthy ears without recent otitis media.
  • Normative values for SAA, TPP, and TW were calculated.

Main Results:

  • Mean SAA was 0.25 cm³ at 7 months and 0.34 cm³ at 24 months.
  • Tympanometric width (TW) decreased with age, while tympanometric peak pressure (TPP) remained stable.
  • Higher SAA was observed in boys; recurrent otitis media and tympanostomy tubes affected SAA and TW at 24 months.

Conclusions:

  • Age-specific normative values for SAA and TW are necessary for accurate clinical interpretation.
  • Factors such as sex and history of otitis media influence tympanometric outcomes in young children.

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