4,131 results match your criteria Impedance Audiometry

Conductive hearing loss in large vestibular aqueduct syndrome -clinical observations and proof-of-concept predictive modeling by a biomechanical approach.

Int J Pediatr Otorhinolaryngol 2021 Apr 29;146:110752. Epub 2021 Apr 29.

ENT Institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, Shanghai, 200031, China; NHC Key Laboratory of Hearing Medicine, Fudan University, Shanghai, 200031, China. Electronic address:

Objective: The purpose of this study was to investigate the effect of a dilated vestibular aqueduct on conductive hearing loss (CHL). A biomechanical method was proposed for modeling the patterns of CHL in patients with large vestibular aqueduct syndrome (LVAS).

Study Design: High resolution computed tomography (CT) scans and pure tone audiometry (PTA) were retrospectively collected from 16 patients who were diagnosed with LVAS. Read More

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[Prospects for a passive acoustic research method in otorhinolaryngology].

Vestn Otorinolaringol 2021 ;86(2):66-72

L.I. Sverzhevskiy Research and Clinical Institute of Otorhinolaryngology of the Moscow Healthcare Department, Moscow, Russia.

The authors of the article reviewed acoustic research methods in otorhinolaryngology. All acoustic diagnostic methods are divided into active and passive. Active acoustic methods are based on the emission of acoustic vibrations, in some cases with the subsequent reception and processing of reflected vibrations. Read More

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Assessment of the Hearing Status of School-Age Children from Rural and Urban Areas of Mid-Eastern Poland.

Int J Environ Res Public Health 2021 Apr 18;18(8). Epub 2021 Apr 18.

Institute of Physiology and Pathology of Hearing, Mochnackiego 10, 02-042 Warsaw, Poland.

(1) Background: The purpose of this study was to assess the prevalence of hearing loss in school-age children from rural and urban areas of mid-eastern Poland using standard audiological tests-pure tone audiometry (PTA), impedance audiometry (IA), and otoacoustic emissions (OAEs). (2) Methods: Data were collected from a group of 250 children aged 8 to 13, made up of 122 children from urban areas and 128 children from rural areas of mid-eastern Poland. Hearing was assessed in each of the subjects by means of PTA, IA (tympanometry), and transient-evoked OAEs (TEOAEs). Read More

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Explainable machine learning determines effects on the sound absorption coefficient measured in the impedance tube.

J Acoust Soc Am 2021 Mar;149(3):1932

Dynamics Group, Mechanical Engineering, Hamburg University of Technology, Am Schwarzenberg-Campus, Hamburg 21073, Germany.

Measurements of acoustic properties of sound absorbing materials in impedance tubes show poor reproducibility, which was demonstrated in round robin tests. The impedance tube measurements are standardized but lack precise definitions of the actual measurement setup, specimen preparation, and other factors that introduce uncertainty in practice. In this paper, machine learning models identify those factors that mostly affect the sound absorption coefficient from a large data set of more than 3000 absorption spectra measured in one impedance tube. Read More

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Middle ear barotrauma in diving.

Diving Hyperb Med 2021 Mar;51(1):44-52

Department of Otorhinolaryngology - Head and Neck Surgery, Head and Neck Center, Helsinki University Hospital and University of Helsinki, Helsinki, Finland.

Introduction: Middle ear barotrauma (MEBt) is the most common medical complication in diving, posing a serious risk to dive safety. Given this prevalence and the continuing growth of the diving industry, a comprehensive overview of the condition is warranted.

Methods: This was a survey study. Read More

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Deep-Subwavelength-Optimized Holey-Structured Metamaterial Lens for Nonlinear Air-Coupled Ultrasonic Imaging.

Sensors (Basel) 2021 Feb 7;21(4). Epub 2021 Feb 7.

Department of Mechanical Engineering, University of Bath, Claverton Down, Bath BA2 7AY, UK.

Ultrasound non-destructive testing (NDT) is a common technique used for defect detection in different materials, from aluminium to carbon-fiber-reinforced polymers (CFRPs). In most cases, a liquid coupling medium/immersion of the inspected component is required to maximize impedance matching, limiting the size of the structure and materials. Air-coupled inspection methods have recently been developed for noncontact inspections to reduce contact issues in standard ultrasonic inspections. Read More

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February 2021

Decreased Sound Tolerance in Tinnitus Patients.

Life (Basel) 2021 Jan 26;11(2). Epub 2021 Jan 26.

Teleaudiology and Screening Examination Department, World Hearing Center, Institute of Physiology and Pathology of Hearing, Mokra 17, 05-830 Warsaw, Poland.

(1) Background: Decreased sound tolerance is a significant problem in tinnitus sufferers. The aim of the study was to evaluate the relationship between tinnitus and decreased sound tolerance (hyperacusis and misophonia). (2) Methods: The study sample consisted of 74 patients with tinnitus and decreased sound tolerance. Read More

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January 2021

Effects of different electrodes used in bone-guided extracochlear implants on electrical stimulation of auditory nerves in guinea pigs.

Tzu Chi Med J 2021 Jan-Mar;33(1):42-48. Epub 2020 Jul 13.

Department of Otolaryngology, Hualian Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan.

Objective: Conventional cochlear implants provide patients who are deaf with hearing via electrical intracochlear stimulations. Stimulation electrodes are inserted into the cochlea through a cochleostomy or round window membrane (RWM) approach. However, these methods might induce cochlear ossificans and loss of residual hearing by damaging inner ear structures. Read More

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Audiovestibular functioning of post-menopausal females with osteoporosis and osteopenia.

J Otol 2021 Jan 9;16(1):27-33. Epub 2020 Aug 9.

Dept. of Endocrinology, PGIMER, Chandigarh, India.

Introduction: Osteoporosis and osteopenia are progressive disorders characterized by decreased bone mass, especially in postmenopausal women. These can be associated with body pain, fractures, hearing loss and balance disorders. The present study aims to evaluate audio-vestibular function in postmenopausal patients with osteopenia or osteoporosis. Read More

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January 2021

Cognitive performance and long-latency auditory evoked potentials: a study on aging.

Clinics (Sao Paulo) 2021 22;76:e1567. Epub 2021 Jan 22.

Universidade Estadual de Ciencias da Saude de Alagoas (UNCISAL), Maceio, AL, BR.

Objective: To evaluate the relationship between cognitive performance and long-latency auditory evoked potentials in an elderly population.

Methods: The sample consisted of adults between 20 and 58 years of age and elderly adults between 60 and 70 years of age. The screening procedures adopted were an inspection of the external auditory canal, tonal and vocal audiometry, tympanometry, brain stem auditory evoked potential, the Montreal Cognitive Assessment test, and long-latency auditory evoked potential. Read More

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Eustachian Tube Function Assessment after Radiofrequency Turbinate Reduction in Atopic and Non-Atopic Patients.

Int J Environ Res Public Health 2021 01 20;18(3). Epub 2021 Jan 20.

Bi.N.D. Department, University of Palermo, Via del Vespro, 129, 90127 Palermo, Italy.

(1) Background: Inferior turbinates' hypertrophy is often associated with Eustachian tube dysfunction (ETD); radiofrequency turbinate reduction (RTR) may provide a long-term improvement of nasal obstruction and ETD-related symptoms. (2) Aim: The study aimed to compare ETD in atopic and non-atopic patients before and after RTR and to investigate the correlation between tympanometry and Eustachian Tube Dysfunction Questionnaire-7 (ETDQ-7). (3) Methods: Ninety-seven patients, ranging from 33 to 68 years old, were screened by skin tests and divided into atopic (G1) and non-atopic (G2). Read More

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January 2021

Concurrent chemoradiation in locally advanced primary middle ear lymphoepithelial carcinoma: an effective treatment modality case report.

J Otolaryngol Head Neck Surg 2021 Jan 6;50(1). Epub 2021 Jan 6.

Department of Otolaryngology, SingHealth, 20 College Road, Level 5 Academia, Singapore, 169856, Singapore.

Background: Definitive treatment of primary middle ear lymphoepithelial carcinoma (LEC) is not well established owing to the rarity of this disease entity. We report a case of locally advanced primary middle ear LEC treated with concurrent chemoradiation, with good oncologic outcomes.

Case Presentation: A 46 year-old female of Cantonese (Southern Chinese) descent presented with a four-month history of left sided hearing loss and non-pulsatile tinnitus, associated with progressive ipsilateral facial weakness. Read More

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January 2021

An efficient rectilinear Gaussian beam tracing method for sound propagation modelling in a non-turbulent medium.

J Acoust Soc Am 2020 Dec;148(6):4037

Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay Road, Hong Kong Special Administrative Region, China.

Large-distance sound propagation with high-frequency noise sources, multiple obstacles/geometry with varying acoustic impedance is common in real-life applications. To resolve the acoustic governing equations directly is often computationally costly, especially in three-dimensional space. Methods based on geometric acoustics can be more rapid. Read More

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December 2020

A Preliminary Analysis of Tympanometric Parameters in a Local Multiethnic Population.

Audiol Res 2020 Dec 16;10(2):77-82. Epub 2020 Dec 16.

Department of Allied Health, Audiology, Otorhinolaryngology, Changi General Hospital, Singapore 529889, Singapore.

: Tympanometry is a routine clinical test ordered at the Department of Otolaryngology, Ear, Nose and Throat (ENT) at Changi General Hospital (CGH). In combination with the pure tone audiogram, tympanograms aid in the diagnostic value of various middle ear disorders. However, its diagnostic value depends on the physician and audiologist's accuracy of classifying and interpreting the tympanograms. Read More

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December 2020

Morphological, acoustical, mechanical and thermal properties of sustainable green Yucca () fibers: an exploratory investigation.

J Environ Health Sci Eng 2020 Dec 16;18(2):883-896. Epub 2020 Jul 16.

Department of Occupational Health Engineering, School of Public Health, Qazvin University of Medical Sciences, Qazvin, Iran.

Background: The objective of this study was to evaluate the acoustical, morphological, mechanical and thermal properties of fibers extracted from the leaves of Yucca () shrub.

Methods: Several tests were performed on either untreated or alkali-treated (5% NaOH) fibers. The chemical analysis of the fibers was performed to determine their lignin, cellulose, hemicellulose, wax and moisture content. Read More

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December 2020

Design and Validation of a Powered Knee-Ankle Prosthesis with High-Torque, Low-Impedance Actuators.

IEEE Trans Robot 2020 Dec 13;36(6):1649-1668. Epub 2020 Jul 13.

T. Elery is with the Departments of Bioengineering and Mechanical Engineering, University of Texas at Dallas, Richardson, TX 75080 USA. S. Rezazadeh is with the Department of Mechanical Engineering, University of Denver, Denver, CO, 80208 USA. C. Nesler and R. D. Gregg are with the Department of Electrical Engineering and Computer Science; Robotics Institute, University of Michigan, Ann Arbor, MI, 48109 USA.

We present the design of a powered knee-ankle prosthetic leg, which implements high-torque actuators with low-reduction transmissions. The transmission coupled with a high-torque and low-speed motor creates an actuator with low mechanical impedance and high backdrivability. This style of actuation presents several possible benefits over modern actuation styles in emerging robotic prosthetic legs, which include free-swinging knee motion, compliance with the ground, negligible unmodeled actuator dynamics, less acoustic noise, and power regeneration. Read More

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December 2020

COVID-19 and Tinnitus.

Ear Nose Throat J 2021 Apr 4;100(2_suppl):160S-162S. Epub 2020 Dec 4.

Audiology and Speech Language Pathology, Al Wakra Hospital, 36977Hamad Medical Corporation, Doha, Qatar.

Coronavirus disease 2019 (COVID-19) is an infectious respiratory disease caused by the severe acute respiratory syndrome coronavirus 2, brings with it a plethora of health concerns. Although most people have mild symptoms, which are respiratory in nature, some experience neurological symptoms, central nervous system manifestations, peripheral nervous manifestations, and skeletal muscle manifestations. But the damaging impact of COVID-19 virus on the hearing organs in the inner ear is a new finding yet to be explored. Read More

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Ventilation tube non-function due to blockage in children: the frequency, course and effect on hearing. A prospective cohort study.

J Laryngol Otol 2020 Dec 4;134(12):1052-1059. Epub 2020 Dec 4.

Otorhinolaryngology and Head and Neck Surgery, University of Glasgow, Scotland, UK, affiliated with Medical Research Council/Chief Scientist Office ('MRC/CSO') Institute of Hearing Research, Glasgow, Scotland, UK.

Objective: To assess the effect on hearing of non-functioning ventilation tubes due to blockage during the first six months post-operatively, using UK national guidelines.

Method: A prospective, observational study was conducted on 37 children who underwent bilateral ventilation tube insertion. Air and bone conduction thresholds were measured before and following surgery, and at one, three and six months post-operatively. Read More

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December 2020

Hidden Electrode Failure in a Cochlear Implant User.

Laryngoscope 2021 04 15;131(4):E1275-E1278. Epub 2020 Aug 15.

Department of Otolaryngology, Hannover Medical School, Hannover, Germany.

When the impedance of an electrode contact is highly increased in a cochlear implant, a failure of the appropriate electrode seems obvious. We present a case where impedances of some electrodes were at the lower edge of the normal range and not regarded as suspicious neither by the clinical fitting software nor by in-vivo tests conducted by the implant manufacturer. However, speech comprehension was substantially degraded and sound perception distorted. Read More

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Age-related hearing loss at Gwagwalada area council of federal capital territory, Abuja.

Niger J Clin Pract 2020 Nov;23(11):1494-1499

Department of Otorhinolaryngology, University College Hospital, Ibadan and College of Medicine, University of Ibadan, Nigeria.

Background: Presbyacusis is a cause of hearing loss in adults worldwide. It is a type of auditory dysfunction thought to be due to a series of insults over time including agerelated degeneration, noise exposure, and diseases of the ear. It usually affects the high frequencies of hearing. Read More

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November 2020

Tympanometric findings among Nigerian prison inmates: A cross-sectional survey.

Niger Postgrad Med J 2020 Oct-Dec;27(4):365-370

Department of Otorhinolaryngology, Head and Neck Surgery, University College Hospital, Ibadan and College of Medicine, University of Ibadan, Ibadan, Nigeria.

Background: Prisoners, due to confinement, are isolated from contact with society and access to many of the facilities, including medical care. There is paucity of data on the middle ear function of prison inmates in the English literature globally. We aimed to assess the middle ear function of prison inmates in Kaduna, Nigeria. Read More

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January 2021

Interpretation of Normal and Abnormal Tympanogram Findings in Eustachian Tube Dysfunction.

Otolaryngol Head Neck Surg 2020 Oct 20:194599820965236. Epub 2020 Oct 20.

Department of Otolaryngology-Head and Neck Surgery, School of Medicine, Tulane University, New Orleans, Louisiana, USA.

Objective: To characterize the relationship between objective tympanogram values and patient-reported symptoms and associations with common comorbid conditions.

Study Design: Cross-sectional study with prospective data collection.

Setting: Tertiary medical center. Read More

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October 2020

Refining Measurements of Power Absorbance in Newborns: Probe Fit and Intrasubject Variability.

Ear Hear 2020 Oct 16;42(3):531-546. Epub 2020 Oct 16.

Department of Communication Sciences and Disorders, Syracuse University, Syracuse, New York, USA.

Objectives: Because unresolved debris in the ear canal or middle ear of newborns may produce high false positive rates on hearing screening tests, it has been suggested that an outer/middle ear measure can be included at the time of hearing screening. A potential measure is power absorbance (absorbance), which indicates the proportion of power in a broadband acoustic stimulus that is absorbed through the outer/middle ear. Although absorbance is sensitive to outer/middle dysfunction at birth, there is large variability that limits its accuracy. Read More

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October 2020

Eustachian tube function test as a predictor of middle ear barotrauma.

Int Marit Health 2020 ;71(3):195-200

Department of aviation and maritime medicine Military Medical Academy Sofiq, Georgi Sofijski 3 str, 1000 Sofia, Bulgaria.

Background: Most of the cases of middle ear barotrauma in divers are due to the impassability of the Eustachian tube. The aim of our study is to compare the results of tympanometry and Valsalva part of Eustachian Tube Function test (ЕТF-test) with the ability of divers to compensate for the change in ambient pressure in a hyperbaric chamber.

Material And Methods: The study included 35 professional divers undergoing annual medical examination. Read More

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The effect of noise exposure on the vestibular systems of dental technicians.

Safa Alqudah

Noise Health 2019 Nov-Dec;21(103):223-231

Department of Rehabilitation Sciences, Faculty of Applied Medical Sciences, Jordan University of Science and Technology, Irbid, Jordan.

Background: Noise exposure is the primary cause of acquired hearing loss in several occupational settings, including dental laboratories and clinics. However, the impact of noise exposure on the vestibular system is not as well researched.

Purpose: To investigate the nature of vestibular damage caused by working in dental laboratories and clinics with high levels of noise exposure due to loud dental equipment. Read More

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October 2020

Audiological evaluation of patients with cleidocranial dysplasia (CCD).

Eur Rev Med Pharmacol Sci 2020 08;24(16):8281-8287

Department of Hearing Healthcare Profession, Chair of Biophysics, Poznan University of Medical Sciences, Poznań, Poland.

Objective: The description of clinical manifestation of hearing problems in cleidocranial dysplasia (CCD) remains limited and incomplete, since CCD constitutes a rare congenital disorder. The study aims to provide a complex panel analysis of the auditory system in patients suffering from the disease.

Patients And Methods: The study group consisted of 4 children with CCD (aged: 12-15), who underwent orthodontic treatment. Read More

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Oral prednisolone for acute otitis media in children: a pilot, pragmatic, randomised, open-label, controlled study (OPAL study).

Pilot Feasibility Stud 2020 29;6:121. Epub 2020 Aug 29.

Institute for Evidence-Based Healthcare, Bond University, 14 University Drive, Robina, QLD 4226 Australia.

Background: Acute otitis media (AOM) is associated with high antibiotic prescribing rates. Antibiotics are somewhat effective in improving pain and middle ear effusion (MEE); however, they have unfavourable effects. Alternative treatments, such as corticosteroids as anti-inflammatory agents, are needed. Read More

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Analysis of wideband tympanometry in Ménière's disease.

Braz J Otorhinolaryngol 2020 Jul 21. Epub 2020 Jul 21.

Faculdade de Ciências Médicas Santa Casa de São Paulo (FCMSCSP), Departamento de Otorrinolaringologia, São Paulo, SP, Brazil.

Introduction: Endolymphatic hydrops is the pathophysiological substrate of Ménière's disease. The changes in the inner ear, transmitted to the middle ear through changes in the ossicular chain mobility, can be quantified by wideband tympanometry, through the measurement of the acoustic absorbance at multiple frequencies, represented by the sound energy absorbed by the middle ear, even at its early stages. Studying the behavior of the middle ear through the absorbance in patients with endolymphatic hydrops under ambient pressure and under peak pressure can be useful for detecting Ménière's disease. Read More

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Posterior semi-circular canal electrode misplacement in Goldenhar's syndrome.

Cochlear Implants Int 2021 Jan 6;22(1):56-60. Epub 2020 Aug 6.

Madras ENT Research Foundation (P) Ltd, Chennai, India.

Literature documents the incidence of electrode misplacement within the range of 0.2% to 5.8% with the superior SCC as the most common site, followed by the vestibule. Read More

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January 2021

Hearing Loss in SARS-CoV-2: What Do We Know?

Ear Nose Throat J 2021 Apr 5;100(2_suppl):152S-154S. Epub 2020 Aug 5.

Department of Otorhinolaryngology, 173800Hospital Tuanku Ja'afar, Jalan Rasah, Seremban, Negeri Sembilan, Malaysia.

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