[Follow-up of sound pressure level at the tympanic membrane at varying impedance of the tympanic membrane-ossicular system].
We investigated the influence of varying compliance of the tympanic membrane on the sound pressure level of the human ear canal using a model with adjustable compliance. Decrease of compliance augments the sound pressure close to the tympanic membrane due to the increase of reflected sound pressure. This augmentation occurs in a narrow frequency area near the maximum resonance frequency and reaches 6 dB (SPL). These experimental data correlate well with clinical investigations in patients with middle ear effusion before and after operation and in patients performing the Valsalva manoeuvre.
Hartwein
J
J
Univ.-HNO-Klinik Hamburg-Eppendorf.
D000158:Acoustic Impedance Tests; D004429:Ear Ossicles / Q000502:physiology*; D006801:Humans; D008144:Loudness Perception / Q000502:physiology*; D008953:Models, Anatomic; D011571:Psychoacoustics; D012016:Reference Values; D014432:Tympanic Membrane / Q000502:physiology*; D014636:Valsalva Maneuver / Q000502:physiology
Untersuchungen zum Verlauf des Schalldruckpegels vor dem Trommelfell bei unterschiedlicher Impedanz des Trommelfell-Gehörknöchelchen-Apparates (TGA).