Auditory threshold shift following air pressure change in the external auditory canal
Auditory threshold shift for air conduction following various air pressure changes in the external auditory canal was examined. The obtained figure was named “tympanoaudiogram”. It was applied for normal subjects and patients with middle ear diseases. The results were compared with tympanogram. When...
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| Published in | AUDIOLOGY JAPAN Vol. 32; no. 3; pp. 212 - 220 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | English Japanese |
| Published |
Japan Audiological Society
1989
|
| Online Access | Get full text |
| ISSN | 0303-8106 1883-7301 1883-7301 |
| DOI | 10.4295/audiology.32.212 |
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| Abstract | Auditory threshold shift for air conduction following various air pressure changes in the external auditory canal was examined. The obtained figure was named “tympanoaudiogram”. It was applied for normal subjects and patients with middle ear diseases. The results were compared with tympanogram. When artificial static air pressure (positive or negative pressures) was established in the ear canal of normal subjects, hearing attenuation was observed in low and middle frequencies. The curve was similar with the theoretical curve for increased stiffness of the tympanic membrane. Thus, 250Hz threshold curve as a function of air pressure change was similar with the shape of A type tympanogram. Tympanoaudiograms in the patients with congenital incudostapedial disconnection slowed an absolutely different pattern, although conventional tympanogram showed A or Ad types. Thresholds were elevated by +200mmH2O, however, marked threshold gains were measured by -200mmH2O in low and middle frequency tones. Differences in the threshold levels between +200 and -200mmH2O were 26 to 39dB in 250Hz. Further study should be performed to clarify the mechanism of these results. However, they indicate that this test can be of value in differential diagnosis of the ossicular diseases. |
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| AbstractList | Auditory threshold shift for air conduction following various air pressure changes in the external auditory canal was examined. The obtained figure was named “tympanoaudiogram”. It was applied for normal subjects and patients with middle ear diseases. The results were compared with tympanogram. When artificial static air pressure (positive or negative pressures) was established in the ear canal of normal subjects, hearing attenuation was observed in low and middle frequencies. The curve was similar with the theoretical curve for increased stiffness of the tympanic membrane. Thus, 250Hz threshold curve as a function of air pressure change was similar with the shape of A type tympanogram. Tympanoaudiograms in the patients with congenital incudostapedial disconnection slowed an absolutely different pattern, although conventional tympanogram showed A or Ad types. Thresholds were elevated by +200mmH2O, however, marked threshold gains were measured by -200mmH2O in low and middle frequency tones. Differences in the threshold levels between +200 and -200mmH2O were 26 to 39dB in 250Hz. Further study should be performed to clarify the mechanism of these results. However, they indicate that this test can be of value in differential diagnosis of the ossicular diseases. |
| Author | Funai, Hiroaki |
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| References | 3) 船井洋光, 他: プローブ音の連続周波数変化によるチンパノグラムの3次元的再構成. Audiology Japan, 24; 26-30, 1981. 16) Rasmussen, H.: Studies on the effect on the air conduction and bone conduction from changes in the meatal pressure in normal subjects and otosclerotic patienst. Acta Otolaryng, Suppl. 74; 54-64, 1948. 9) Terkildsen, K. and Nielsen, S.: An electroacoustic impedance measuring bridge for clinical use. Arch. Otolaryngol, 72; 339-346, 1960. 1) 舩坂宗太郎: インピーダンス・オージオメトリ. 耳喉科, 53; 696-702, 1981. 15) Rasmussen, H.: Studies on the effect upon the hearing through air conduction brought about by variations of the pressure in the auditory meatus. Acta Otolaryng, 34; 415-424, 1946. 12) Lidén, G. et al.: Tympanometry for the diagnosis of ossicular disruption. Arch. Otolaryngol, 99; 23-29, 1974. 14) Margolis, R. H. et al.: Multifrequency tympanometry in normal ears. Audiology, 24; 44-53, 1985. 17) Huizing, E. H.: Bone conduction. The influence of the middle ear. Chapter II. Effect of air pressure change. Acta Otolaryng, Suppl. 155; 18-34, 1960. 7) Opitz, H. J. et al: Zur Differentialdiagnostik bei Mittelohrschwerhörigkeit mit Hilfe druckbedingter Impedanz- und Hörschwellenänderungen. Z. Laryng. Rhinol, 52; 206-217, 1973. 11) Funasaka, S.: Congenital ossicular anomalies without malformations of the external ear. Arch. Otorhinolaryngol, 224; 231-240, 1979. 13) Colletti, V.: Methodologic observations on tympanometry with regard to the probe tone frequency. Acta Otolaryngol, 80; 54-60, 1975. 8) Terkildsen, K. and Thomsen, K. A.: The influence of pressure variations on the impedance of the human ear drum. J. Laryngol. Otol, 73; 409-418, 1959. 4) 恩地 豊: インピーダンス・オージオメトリーの原理-チンパノグラムとは何か, インピーダンスとは何か, その応用-その3. 耳臨, 75; 3-16, 1981. 5) 船井洋光, 他: プローブ音の連続周波数変化および位相計測を導入したインピーダンス検査法-インピーダンス・ベクトル軌跡 (仮称)-. Audiology Japan, 25; 84-89, 1982. 2) 恩地 豊: インピーダンス・オージオメトリーの原理-チンパノグラムとは何か, インピーダンスとは何か, その応用-その1. 耳臨, 74; 2597-2613, 1981. 6) Opitz, H. J. et al: Auswirkungen druckbedingter Impedanzänderungen auf die Hörschwelle bei Normalhörigen. Z. Laryng. Rhinol, 52; 200-205, 1973. 10) Thomsen, K. A.: Objective determination of the middle-ear pressure. Acta Otolaryng, Suppl. 158; 212-216, 1960. |
| References_xml | – reference: 13) Colletti, V.: Methodologic observations on tympanometry with regard to the probe tone frequency. Acta Otolaryngol, 80; 54-60, 1975. – reference: 6) Opitz, H. J. et al: Auswirkungen druckbedingter Impedanzänderungen auf die Hörschwelle bei Normalhörigen. Z. Laryng. Rhinol, 52; 200-205, 1973. – reference: 15) Rasmussen, H.: Studies on the effect upon the hearing through air conduction brought about by variations of the pressure in the auditory meatus. Acta Otolaryng, 34; 415-424, 1946. – reference: 17) Huizing, E. H.: Bone conduction. The influence of the middle ear. Chapter II. Effect of air pressure change. Acta Otolaryng, Suppl. 155; 18-34, 1960. – reference: 3) 船井洋光, 他: プローブ音の連続周波数変化によるチンパノグラムの3次元的再構成. Audiology Japan, 24; 26-30, 1981. – reference: 7) Opitz, H. J. et al: Zur Differentialdiagnostik bei Mittelohrschwerhörigkeit mit Hilfe druckbedingter Impedanz- und Hörschwellenänderungen. Z. Laryng. Rhinol, 52; 206-217, 1973. – reference: 4) 恩地 豊: インピーダンス・オージオメトリーの原理-チンパノグラムとは何か, インピーダンスとは何か, その応用-その3. 耳臨, 75; 3-16, 1981. – reference: 16) Rasmussen, H.: Studies on the effect on the air conduction and bone conduction from changes in the meatal pressure in normal subjects and otosclerotic patienst. Acta Otolaryng, Suppl. 74; 54-64, 1948. – reference: 12) Lidén, G. et al.: Tympanometry for the diagnosis of ossicular disruption. Arch. Otolaryngol, 99; 23-29, 1974. – reference: 8) Terkildsen, K. and Thomsen, K. A.: The influence of pressure variations on the impedance of the human ear drum. J. Laryngol. Otol, 73; 409-418, 1959. – reference: 10) Thomsen, K. A.: Objective determination of the middle-ear pressure. Acta Otolaryng, Suppl. 158; 212-216, 1960. – reference: 1) 舩坂宗太郎: インピーダンス・オージオメトリ. 耳喉科, 53; 696-702, 1981. – reference: 9) Terkildsen, K. and Nielsen, S.: An electroacoustic impedance measuring bridge for clinical use. Arch. Otolaryngol, 72; 339-346, 1960. – reference: 14) Margolis, R. H. et al.: Multifrequency tympanometry in normal ears. Audiology, 24; 44-53, 1985. – reference: 5) 船井洋光, 他: プローブ音の連続周波数変化および位相計測を導入したインピーダンス検査法-インピーダンス・ベクトル軌跡 (仮称)-. Audiology Japan, 25; 84-89, 1982. – reference: 2) 恩地 豊: インピーダンス・オージオメトリーの原理-チンパノグラムとは何か, インピーダンスとは何か, その応用-その1. 耳臨, 74; 2597-2613, 1981. – reference: 11) Funasaka, S.: Congenital ossicular anomalies without malformations of the external ear. Arch. Otorhinolaryngol, 224; 231-240, 1979. |
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| Title | Auditory threshold shift following air pressure change in the external auditory canal |
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