Analysis by Sweep Frequency Impedance (SFI) Meter of 226-Hz and 1,000-Hz Tympanometries in Neonates

Michio Murakoshi, Kyosuke Sano, Nattikan Kanka, Naoto Yoshida, Shinji Hamanishi, Hiromichi Kiyokawa, Risako Kakuta, Sreedevi Aithal, Venkatesh Aithal, Joseph Kei, Carlie Driscoll, Andrew Swanston, Sachiko Mtsutani, Toshimitsu Kobayashi, Hiroshi Wada

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


Conventional 226-Hz tympanometry has been acknowledged as a reliable method for detecting middle ear dysfunction in adults and children. However, its application has proved to be inaccurate in neonates younger than 7 months of age. In the present study, therefore, tympanograms of neonates were derived based on sweep frequency impedance (SFI) data and an attempt was made to investigate the reason why conventional tympanometry is inadequate for neonates. Analysis of neonatal tympanograms revealed that the application of a conventional 226-Hz probe tone leads to either a type A or a type M tympanogram. This is possibly due to the intrinsic oscillatory behavior of the external ear canal wall caused by its resonance at around 226 Hz.

Original languageEnglish
Pages (from-to)5-14
Number of pages10
JournalProcedia IUTAM
Publication statusPublished - 2017
EventIUTAM Symposium on Advances in Biomechanics of Hearing, 2016 - Stuttgart, Germany
Duration: 2016 Jun 172016 Jun 20


  • 1,000 Hz
  • 226 Hz
  • Conventional tympanometry
  • External ear canal wall
  • High-frequency tympanometry
  • Middle ear
  • Neonates
  • Sweep frequency impedance (SFI) meter


Dive into the research topics of 'Analysis by Sweep Frequency Impedance (SFI) Meter of 226-Hz and 1,000-Hz Tympanometries in Neonates'. Together they form a unique fingerprint.

Cite this