Ear Canal Pressure Variations Versus Negative Middle Ear Pressure: Comparison Using Distortion Product Otoacoustic Emission Measurement in Humans

2012 ◽  
Vol 33 (1) ◽  
pp. 69-78 ◽  
Author(s):  
Xiao-Ming Sun
Keyword(s):  
Middle Ear ◽  
Otoacoustic Emission ◽  
Emission Measurement ◽  
Distortion Product Otoacoustic Emission ◽  
Ear Canal ◽  
Distortion Product ◽  
Middle Ear Pressure

scholarly journals Significance of a notch in the otoacoustic emission stimulus spectrum

2012 ◽  
Vol 126 (9) ◽  
pp. 897-901
Author(s):  
J Grenner
Keyword(s):  
Tympanic Membrane ◽  
Otitis Media ◽  
Clinical Observation ◽  
Otoacoustic Emission ◽  
Emission Measurement ◽  
Frequency Range ◽  
Ear Canal ◽  
Secretory Otitis Media ◽  
Middle Ear Pressure ◽  
Transient Evoked Otoacoustic Emission

AbstractObjective:To explain a clinical observation: a notch in the stimulus spectrum during transient evoked otoacoustic emission measurement in ears with secretory otitis media.Methods:The effects of tympanic under-pressure were investigated using a pressure chamber. A model of the ear canal was also studied.Results:Tympanic membrane reflectance increased as a consequence of increased stiffness, causing a notch in the stimulus spectrum. In an adult, the notch could be clearly distinguished at an under-pressure of approximately −185 daPa. The sound frequency of the notch corresponded to a wavelength four times the ear canal length. The ear canal of infants was too short to cause a notch within the displayed frequency range. The notch was demonstrated using both Otodynamics and Madsen equipment.Conclusion:A notch in the otoacoustic emission stimulus spectrum can be caused by increased stiffness of the tympanic membrane, raising suspicion of low middle-ear pressure or secretory otitis media. This finding is not applicable to infants.

Effect of middle ear effusion on distortion product otoacoustic emission

2004 ◽  
Vol 68 (4) ◽  
pp. 437-440 ◽  
Author(s):  
Abdullah Tas ◽  
Recep Yagiz ◽  
Cem Uzun ◽  
Mustafa K Adali ◽  
Muhsin Koten ◽  
...  
Keyword(s):  
Middle Ear ◽  
Otoacoustic Emission ◽  
Distortion Product Otoacoustic Emission ◽  
Middle Ear Effusion ◽  
Distortion Product ◽  
Ear Effusion

scholarly journals Dynamic characteristics of the middle ear after stapes surgery: a distortion product otoacoustic emission study

2017 ◽  
Vol 33 (1) ◽  
pp. 1
Author(s):  
MohammadW El-Anwar ◽  
HaniA Riad ◽  
HeshamAbd El-Rahman ◽  
SalwaM Abdel Latif ◽  
AhmedAM Fawzy
Keyword(s):  
Middle Ear ◽  
Dynamic Characteristics ◽  
Otoacoustic Emission ◽  
Stapes Surgery ◽  
Distortion Product Otoacoustic Emission ◽  
Distortion Product ◽  
Emission Study

Evaluating the Function of the Medial Olivocochlear Bundle in Patients With Bilateral Tinnitus

2020 ◽  
Vol 63 (6) ◽  
pp. 1969-1978
Author(s):  
Lin-Hua Cheng ◽  
Chih-Hung Wang ◽  
Rou-Huei Lu ◽  
Yu-Fu Chen
Keyword(s):  
Otoacoustic Emission ◽  
Clinical Test ◽  
Emission Measurement ◽  
Distortion Product Otoacoustic Emission ◽  
Contralateral Noise ◽  
Distortion Product ◽  
Speech In Noise ◽  
Medial Olivocochlear ◽  
Test Outcomes ◽  
Medial Olivocochlear Bundle

Purpose No study has investigated the effects of contralateral noise (CN) on speech-in-noise perception (SINP) in listeners with tinnitus. The mechanisms underlying the involvement of medial olivocochlear (MOC) reflex with SINP remain to be elucidated. This study aimed to investigate the MOC function in patients with bilateral tinnitus by measuring distortion product otoacoustic emission and SINP. Method Eighteen patients with bilateral tinnitus (one male and 17 females; age: M ± SD = 45.61 ± 10.18 years) and 19 listeners without tinnitus (six males and 13 females; age: M ± SD = 34.11 ± 8.35 years) were recruited for the study. Each subject underwent distortion product otoacoustic emission measurement and the SINP test for both ears. The effects of CN on these two measurements were compared between tinnitus ears (TEs) and no-tinnitus ears (NTEs). Results The presence of CN significantly reduced distortion product (DP) amplitudes and improved SINP for TEs, and the amounts of DP suppression and SINP improvement were similar to those in NTEs. Improvement of SINP was positively correlated with DP suppression at 6185 Hz for NTEs and at 1640 Hz for TEs. Conclusions The results of this study suggest that the amounts of DP suppression and SINP improvement were similar between listeners with and without tinnitus. For both ear groups, the MOC reflex was involved with SINP at specific frequencies. Any clinical test outcomes with regard to the MOC bundle in patients with tinnitus should be interpreted with caution until further studies are conducted.

scholarly journals Alteration of distortion product otoacoustic emission input/output functions in subjects with a previous history of middle ear dysfunction

2012 ◽  
Vol 18 (4) ◽  
pp. MT27-MT31 ◽  
Author(s):  
Ualace De P. Campos ◽  
Seisse G. Sanches ◽  
Stavros Hatzopoulos ◽  
Renata M. M. Carvallo ◽  
Krzysztof Kochanek ◽  
...  
Keyword(s):  
Middle Ear ◽  
Previous History ◽  
Otoacoustic Emission ◽  
Distortion Product Otoacoustic Emission ◽  
Input Output ◽  
Distortion Product ◽  
History Of
Sign in / Sign up

Export Citation Format

Share Document