Round Window Displacement caused by altered middle ear pressure inducing impairment of bone-conduction threshold?

  • W. Maier
  • U. H. Ross
Conference paper


Displacement of the tympanic membrane causing increased middle ear (ME) impedance is usually followed by deterioration of air conduction (AC) threshold. In normal hearing subjects with mobile ossicles low-frequency bone-conduction (BC) threshold also deteriorates (positive Gelle’s test). This is usually interpreted by influence of middle ear factors: Both the elevation of the resonance frequency of the ossicular chain and reduction of the ostio-tympanic component of BC resulting from increased stiffness1. In contrast, Gelle’s test is negative in patients with a fixed stapes2.


Tympanic Membrane Ossicular Chain Endolymphatic Hydrops Cochlear Aqueduct Pure Tone Audiogram 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1996

Authors and Affiliations

  • W. Maier
    • 1
  • U. H. Ross
    • 1
  1. 1.Dept. OtolaryngologyFreiburg UniversityGermany

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