The Influence of Pressure Variations on the Impedance of the Human Ear Drum

Terkildsen, K.; Thomsen, K.

doi:10.1017/s002221510005550x

Cited by 93 publications

(19 citation statements)

References 11 publications

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“…An innovation that led to improved clinical utility was the measurement of acoustic impedance over a range of earcanal air pressures in a test called tympanometry (Terkildsen and Thomsen, 1959). This pressurization differentially affected the mobility of the eardrum as assessed using a pure tone.…”

Section: Middle-ear Tests: Acoustic Impedance and Admittance Tympanommentioning

confidence: 99%

Acoustical Tests of Middle-Ear and Cochlear Function in Infants and Adults

Keefe¹

2012

Acou. Today

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Section: Middle-ear Tests: Acoustic Impedance and Admittance Tympanommentioning

confidence: 99%

Acoustical Tests of Middle-Ear and Cochlear Function in Infants and Adults

Keefe¹

2012

Acou. Today

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“…Impedance measurements provide many advantages, among which the fact that it is an objective method of integrity and function of hearing peripheral mechanism and it is possible to estimate quantitative changes, in addition to being simple and easy to perform 20,21 .…”

Section: Immittanciometrymentioning

confidence: 99%

Avaliação de alterações timpanométricas em pacientes submetidos à anestesia geral com óxido nitroso

Teixeira¹,

Tomita

Lima

2005

Rev. Bras. Otorrinolaringol.

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Ni trous oxide is an inhaling gas that can increase intratympanic pressure during the anesthetic act and cause negative pressure after it is discontinued, mainly in patients with Eustachian tube dysfunction. These pressure variations may come up with clinical implications such as tympanic membrane rupture, ossicular system disarticulation, haemotympanum, barotraumas, prosthesis displacement stapaedotomy and tympanic graft lateralization after tympanoplasty, in addition to serous fluid entrance into the middle ear during the negative pressure phase. Aim: To evaluate the nitrous oxide influence on the middle ear pressure in a population without tube malfunction performing pre and postoperative tympanometry. Study design: Transversal cohort. Material and Method: A prospective study was carried out with Universitário Clementino Fraga Filho Hospital-UFRJ inpatients submitted to general anesthesia with the use of 50% nitrous oxide from April to June 2003. It was also evaluated whether the duration of surgery, associated anesthetics, presence of allergic rhinitis and nasal septal deviation could contribute to the onset of intratympanic pressure alteration. Results: The sample was made up of 50 patients and in almost half of them (48%), postoperative tympanometry alterations (type C curve) were found when comparing to preoperative tympanometric control (type A curve). Neither gender nor age interfered in the onset of postoperative tympanometry alterations, similarly to surgery duration. The associated volatile anesthetic type, nasal septal deviation and allergic rhinitis were not able to influence postoperative middle ear pressure. Conclusion: Nitrous oxide modifies intratympanic pressure during the anesthetic act and after its discontinuation.Palavras-chave: óxido nitroso, pressão intratimpânica, alterações timpanométricas.

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“…It was introduced by Terkildsen and Thomsen [1] as a method of evaluating the middle ear pressure, and has become a routine component of the audiologic and otologic evaluation process worldwide.…”

Section: Introductionmentioning

confidence: 99%

Multi-Frequency Tympanometry: Clinical Applications for the Assessment of the Middle Ear Status

Iacovou

Vlastarakos

Ferekidis³

et al. 2012

Indian J Otolaryngol Head Neck Surg

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The aim of the present paper was to review the current knowledge on multi-frequency tympanometry and explore its role as a diagnostic tool in various otologic conditions. Literature review in Medline and other database sources. Prospective controlled, prospective comparative, and prospective cohort studies, animal studies, retrospective studies and systematic reviews. Multi-frequency tympanometry provides more accurate and detailed information about the middle ear dynamics than standard tympanometry. Otosclerosis and rheumatoid arthritis characteristically increase the resonant frequency (RF) of the middle ear. Ossicular chain discontinuity, atelectatic tympanic membrane, and otitis media with effusion typically decrease the RF of the middle ear. Multifrequency tympanometry can also assess the stage of rheumatoid arthritis in the presence of middle ear involvement. The RF can be affected by the mechanical impedance of the cochlea, and multi-frequency tympanometry can be helpful in the diagnostic workup of LVAS. Multi-frequency tympanometry can be a useful tool to predict the diagnosis of various middle ear pathologies preoperatively, due to the ensuing changes in the RF of the mechano-acoustic system of the middle ear, which can be accurately determined when this methodology is applied.

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The Influence of Pressure Variations on the Impedance of the Human Ear Drum

Cited by 93 publications

References 11 publications

Acoustical Tests of Middle-Ear and Cochlear Function in Infants and Adults

Acoustical Tests of Middle-Ear and Cochlear Function in Infants and Adults

Avaliação de alterações timpanométricas em pacientes submetidos à anestesia geral com óxido nitroso

Multi-Frequency Tympanometry: Clinical Applications for the Assessment of the Middle Ear Status

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