scholarly journals Effect of Middle-Ear Pathology on High-Frequency Ear Canal Reflectance Measurements in the Frequency and Time Domains

2019 ◽  
Vol 20 (6) ◽  
pp. 529-552 ◽  
Author(s):  
Gabrielle R. Merchant ◽  
Jonathan H. Siegel ◽  
Stephen T. Neely ◽  
John J. Rosowski ◽  
Hideko H. Nakajima
Keyword(s):  
Middle Ear ◽  
High Frequency ◽  
Ear Canal ◽  
Time Domains ◽  
Reflectance Measurements

Effect of middle-ear pathology on high-frequency ear-canal reflectance measurements in the frequency and time domains

2015 ◽  
Author(s):  
Gabrielle R. Merchant ◽  
Jonathan H. Siegel ◽  
Stephen T. Neely ◽  
John J. Rosowski ◽  
Hideko H. Nakajima
Keyword(s):  
Middle Ear ◽  
High Frequency ◽  
Ear Canal ◽  
Time Domains ◽  
Reflectance Measurements

Air Conduction Thresholds and Secretory Otitis Media: A Conventional and Extra-High Frequency Audiometric Comparison

1989 ◽  
Vol 98 (10) ◽  
pp. 767-771 ◽  
Author(s):  
Iain W. S. Mair ◽  
Oddbjørn Fjermedal ◽  
Einar Laukli
Keyword(s):  
Otitis Media ◽  
Middle Ear ◽  
High Frequency ◽  
Pure Tone ◽  
Low Frequency ◽  
Secretory Otitis Media ◽  
Middle Ear Fluid ◽  
Ventilation Tubes ◽  
Air Conduction

A comparison has been made of air conduction threshold changes up to 1 year after myringotomy, aspiration of middle ear fluid, and insertion of ventilation tubes in ten patients with bilateral and 12 with unilateral secretory otitis media (SOM). Pure tone air conduction thresholds have been analyzed in three frequency groups: Low frequency (LF; 0.25, 0.5, and 1 kHz), high frequency (HF; 2,4, and 8 kHz), and extra-high frequency (EHF; 10, 12, 14, and 16 kHz). In the LF and HF ranges, significant improvement came during the first 24 hours after intubation, while in the EHF range, threshold lowering occurred gradually over the following 2 months. Possible explanations for these findings are discussed.

Aerobic and Anaerobic Bacteria in the Middle ear and ear Canal in Acute Otitis Media

1982 ◽  
Vol 93 (sup386) ◽  
pp. 100-102 ◽  
Author(s):  
J. Luotonen ◽  
A. M. M. Jokipii ◽  
P. Sipilä ◽  
J. Väyrynen ◽  
L. Jokipii ◽  
...  
Keyword(s):  
Otitis Media ◽  
Middle Ear ◽  
Anaerobic Bacteria ◽  
Acute Otitis Media ◽  
Ear Canal ◽  
Aerobic And Anaerobic

Simulation of Pathological High Impedance Tympanograms

1986 ◽  
Vol 29 (4) ◽  
pp. 505-514 ◽  
Author(s):  
Karel J. Van Camp ◽  
Janet E. Shanks ◽  
Robert H. Margolis
Keyword(s):  
Tympanic Membrane ◽  
Otitis Media ◽  
Middle Ear ◽  
High Frequency ◽  
Secretory Otitis Media ◽  
High Impedance ◽  
The Relationship

The Vanhuyse, Creten, and Van Camp (1975) model for analyzing high frequency tympanograms predicts the shapes of conductance, susceptance, and admittance tympanograms from the relationship between resistance and reactance tympanograms at the tympanic membrane. This model has been applied primarily to low impedance middle-ear pathologies but has not been applied extensively to the more commonly occurring high impedance pathologies. The purpose of this study was to extend the Vanhuyse et al. (1975) model to high impedance pathologies and to identify tympanometric parameters associated with otosclerosis, secretory otitis media, and lateral ossicular fixation. Data from previous experiments on the shape and absolute values of resistance and reactance tympanograms were used to calculate 678-Hz admittance tympanograms that were unique to each of the three high impedance pathologies. Guidelines for differentiating among the middle-ear pathologies on the basis of high frequency tympanometric shapes are presented.

Multiple Frequency Tympanometry

1993 ◽  
Vol 36 (1) ◽  
pp. 178-185 ◽  
Author(s):  
Janet E. Shanks ◽  
Richard H. Wilson ◽  
Nancy K. Cambron
Keyword(s):  
Phase Angle ◽  
Phase Difference ◽  
Middle Ear ◽  
Multiple Frequency ◽  
Ear Canal ◽  
Sweep Frequency ◽  
Difference Curve ◽  
Angle Measurements ◽  
Rectangular Form ◽  
Acoustic Admittance

Three methods for compensating multiple frequency acoustic admittance measurements for ear canal volume were studied in 26 men with normal middle ear transmission systems. Peak compensated static acoustic admittance (| y |) and phase angle (ø) were calculated from sweep frequency tympanograms (226–1243 Hz in 113 Hz increments). Of the procedures used to compensate for volume in rectangular form, the ear canal pressure used to estimate volume had the largest effect on the estimate of middle ear resonance. Median resonance was 800 Hz for admittance measurements compensated at 200 daPa versus 1100 Hz for measurements compensated at –350 daPa. The remaining two methods, compensation of susceptance only versus both susceptance and conductance and compensation using the minimum volume versus separate volumes at each frequency, did not affect estimates of middle ear resonance. Estimates of middle ear resonance from compensated phase angle measurements also were compared with estimates of resonance from admittance and phase difference curves. although resonance could not be estimated from the phase difference curve, resonance estimated from the admittance difference curve agreed with the estimate from compensated phase angle.

3D Finite Element Modeling of Blast Wave Transmission From the External Ear to a Spiral Cochlea

2021 ◽  
Author(s):  
Marcus Brown ◽  
John Bradshaw ◽  
Rong Z. Gan
Keyword(s):  
Finite Element ◽  
Middle Ear ◽  
Basilar Membrane ◽  
Transverse Motion ◽  
Fe Model ◽  
Ear Canal ◽  
Blast Overpressure ◽  
Stapes Footplate ◽  
Human Ear ◽  
Temporal Bones

Abstract Blast-induced injuries affect the health of veterans, in which the auditory system is often damaged, and blast-induced auditory damage to the cochlea is difficult to quantify. A recent study modeled blast overpressure (BOP) transmission throughout the ear utilizing a straight, two-chambered cochlea, but the spiral cochlea's response to blast exposure has yet to be investigated. In this study, we utilized a human ear finite element (FE) model with a spiraled, two-chambered cochlea to simulate the response of the anatomical structural cochlea to BOP exposure. The FE model included an ear canal, middle ear, and two and half turns of two-chambered cochlea and simulated a BOP from the ear canal entrance to the spiral cochlea in a transient analysis utilizing fluid-structure interfaces. The model's middle ear was validated with experimental pressure measurements from the outer and middle ear of human temporal bones. The results showed high stapes footplate displacements up to 28.5µm resulting in high intracochlear pressures and basilar membrane (BM) displacements up to 43.2µm from a BOP input of 30.7kPa. The cochlea's spiral shape caused asymmetric pressure distributions as high as 4kPa across the cochlea's width and higher BM transverse motion than that observed in a similar straight cochlea model. The developed spiral cochlea model provides an advancement from the straight cochlea model to increase the understanding of cochlear mechanics during blast and progresses towards a model able to predict potential hearing loss after blast.

scholarly journals Macroscopic description of the external and middle ear of paca (Cuniculus paca Linnaeus, 1766)

2015 ◽  
Vol 35 (6) ◽  
pp. 583-589 ◽  
Author(s):  
Leandro L. Martins ◽  
Ijanete Almeida-Silva ◽  
Maria Rossato ◽  
Adriana A.B. Murashima ◽  
Miguel A. Hyppolito ◽  
...  
Keyword(s):  
Tympanic Membrane ◽  
Middle Ear ◽  
Gross Anatomy ◽  
Experimental Models ◽  
Temporal Region ◽  
External Ear ◽  
Wild Animals ◽  
Ear Canal ◽  
Macroscopic Description ◽  
Mouse Ear

Abstract: Paca (Cuniculus paca), one of the largest rodents of the Brazilian fauna, has inherent characteristics of its species which can conribute as a new option for animal experimantation. As there is a growing demand for suitable experimental models in audiologic and otologic surgical research, the gross anatomy and ultrastructural ear of this rodent have been analyzed and described in detail. Fifteen adult pacas from the Wild Animals Sector herd of Faculdade de Ciências Agrárias e Veterinárias, Unesp-Jaboticabal, were used in this study. After anesthesia and euthanasia, we evaluated the entire composition of the external ear, registering and ddescribing the details; the temporal region was often dissected for a better view and detailing of the tympanic bulla which was removed and opened to expose the ear structures analyzed mascroscopically and ultrastructurally. The ear pinna has a triangular and concave shape with irregular ridges and sharp apex. The external auditory canal is winding in its path to the tympanic mebrane. The tympanic bulla is is on the back-bottom of the skull. The middle ear is formed by a cavity region filled with bone and membranous structures bounded by the tympanic membrane and the oval and round windows. The tympanic membrane is flat and seals the ear canal. The anatomy of the paca ear is similar to the guinea pig and from the viewpoint of experimental model has major advantages compared with the mouse ear.

Squamous Epithelium in the Middle Ear and Sinus

1994 ◽  
Vol 73 (1) ◽  
pp. 47-48
Author(s):  
Alper Tutkun ◽  
Caglar Batman ◽  
Cüneyt Üneri ◽  
Mehmet Ali Sehitoglu
Keyword(s):  
Middle Ear ◽  
Statistical Difference ◽  
Squamous Epithelium ◽  
Normal Skin ◽  
University Hospital ◽  
Control Group ◽  
Study Group ◽  
External Ear ◽  
Ear Canal ◽  
Superior Part

This study has been performed between December 1990—March 1991 in the Microsurgery laboratory of the Marmara University Hospital. Twelve healthy albino guinea pigs were used as a study group while the control group consists of three animals. The potentials for cholesteatoma formation of the squamous epithelium, namely the squamous epithelium of the posterior superior part of the external ear canal skin and normal skin, were investigated. Among 24 subjects who were implanted by canal skin, cholesteatoma was fanned in 21 of them. Likewise, 19 of 24 animals implanted by normal skin came out with cholesteatoma formation. Between these two types of epithelium, there is no statistical difference in cholesteatoma formation (p >0.5).

Sign in / Sign up

Export Citation Format

Share Document