gms | German Medical Science

79th Annual Meeting of the German Society of Oto-Rhino-Laryngology, Head and Neck Surgery

German Society of Oto-Rhino-Laryngology, Head and Neck Surgery

30.04. - 04.05.2008, Bonn

Clinical application of high frequency tympanometry in children

Meeting Abstract

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  • corresponding author Todor Karchev - Uni-HNO-Klinik Sofia, Sofia, Bulgarien
  • Diana Popova - Uni-HNO-Klinik Sofia, Sofia, Bulgaria

Deutsche Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie. 79. Jahresversammlung der Deutschen Gesellschaft für Hals-Nasen-Ohren-Heilkunde, Kopf- und Hals-Chirurgie. Bonn, 30.04.-04.05.2008. Düsseldorf: German Medical Science GMS Publishing House; 2008. Doc08hnod499

The electronic version of this article is the complete one and can be found online at:

Published: April 22, 2008

© 2008 Karchev et al.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( You are free: to Share – to copy, distribute and transmit the work, provided the original author and source are credited.



The aim of this study is to perform the clinical practice of tympanometry and to investigate the middle ear dynamic characteristics in newborns using high frequency /HFT/ and conventional tympanometry to evaluate the diagnostic significance of HFT. We tested 101 ears by HFT and conventional tympanometry. 76 ears were in children up to 7 months, respectivly 25 ears – in children up to 3 years old. The first group was divided in two subgroups:

  • A – with blocked middle ear /28 ears/
  • B – children dropped at of the neonatal hearing screening program by transient otoacoustic emmissions /TOAE/ - 48 ears.

All children in the first subgroup /28 ears/ presented high impedance when tested by conventional tympanometry using probing tone 226 Hz. However, tested by HFT /probing tone 1000Hz/ normal tympanometric data where found in 11 ears, while in 17 ears – high impedance. Testing the second subgroup by conventional tympanometry we found high impedance in 40 ears, while 8 ears – with normal values. Tested by HFT – 42 ears were normal and 6 ears with high impedance.

All children from the second group up to 3 years old /25 ears/ showed high impedance tested by conventional tympanometry, while tested by HFT – 4 ears normal and 21 with high impedance.

We considere that HFT is a more precise method for the evaluation of middle ear pressure in children under 7 months.