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Janky Kristen L KL Johns Hopkins University, Otolaryngology - Head and Neck Surgery, Baltimore, MD 21287-0910, USA; Boys Town National Research Hospital, Department of Audiology, Omaha, NE 68131, USA. Electronic address: - - 2014
To determine if vestibular evoked myogenic potential (VEMP) responses change during inversion in patients with superior canal dehiscence syndrome (SCDS) compared to controls. Sixteen subjects with SCDS (mean: 43, range 30-57years) and 15 age-matched, healthy subjects (mean: 41, range 22-57years) completed cervical VEMP (cVEMP) in response to air conduction click ...
Bullen A A Centre for Auditory Research, UCL Ear Institute, London, WC1X 8EE. Electronic address: - - 2014
In the preservation of tissues in as 'close to life' state as possible, rapid freeze fixation has many benefits over conventional chemical fixation. One technique by which rapid freeze-fixation can be achieved, high pressure freezing (HPF), has been shown to enable ice crystal artefact-free freezing and tissue preservation to greater ...
Debacker A A IPCMS/CNRS 23 rue du Loess, 67034 Strasbourg, France and Sika, Tüffenwies 16, CH-8048 Zürich, - - 2014
The imbibition kinetics of a millimeter-sized aggregate of 300 nm diameter colloidal particles by a wetting pure solvent is studied. Three successive regimes are observed. First, the imbibition proceeds by compressing the air inside the aggregate. Next, the solvent stops when the pressure of the compressed air is equal to the ...
Akiyama Naotaro N Department of Otolaryngology-Head and Neck Surgery , Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, - - 2014
High negative pressure in the middle ear was thought to be closely related to the etiology of retraction-type cholesteatoma. Recently, it has been detected that mechanical forces are important factors in epithelial turnover and affect cytoskeletal remodeling. Continuous negative pressure in the middle ear may possibly accelerate the proliferation and ...
Ren Kailiang K Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218 - - 2014
Velocity and pressure microphones composed of piezoelectric poly(γ-benzyl-α,L-glutamate) (PBLG) nanofibers were produced by adhering a single layer of PBLG film to a Mylar diaphragm. The device exhibited a sensitivity of -60 dBV/Pa in air, and both pressure and velocity response showed a broad frequency response that was primarily controlled by ...
Reddy C S CS Homi Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, - - 2014
The voltage recovery in a spark gap for repetitive switching has been a long research interest. A two-pulse technique is used to determine the voltage recovery times of gas spark gap switch with argon gas. First pulse is applied to the spark gap to over-volt the gap and initiate the ...
Doyle William J WJ Department of Otolaryngology, University of Pittsburgh, School of Medicine , Pittsburgh, PA , - - 2014
Abstract Conclusions: Fractional gradient equilibrated (FGE) for ears with applied positive but not negative middle ear (ME)-ambient pressure gradients is highly sensitive to a cold-like illness (CLI). Objective: The sequential development of eustachian tube (ET) dysfunction, ME under-pressure, and otitis media (OM) characterizes many children during a CLI. If linked, ...
Withnell Robert H RH * Department of Speech and Hearing Sciences, Neuroscience Program and Department of Physics, Indiana University , Bloomington, Indiana , - - 2014
Objective: To assess the clinical utility of quantifying pure-tone hearing thresholds in terms of the forward-going sound pressure wave. Design: Sound pressure measurements in the ear canal were used to derive, with hearing threshold measurements, hearing thresholds expressed in terms of the forward-going sound pressure wave, hearing thresholds based on ...
Burdiek Laina M - - 2014
PURPOSE Wideband acoustic immittance (WAI) is a new technique for assessing middle ear transfer function. It includes energy absorbance (EA) measures and can be acquired with the ear canal pressure varied, known as wideband tympanometry (WBTymp). This study aimed to investigate effects of consecutive WBTymp testing on EA. METHOD Data ...
Decremps F F Institut de Minéralogie et Physique des Milieux Condensés, Université Pierre et Marie Curie, 75252 Paris, France. Electronic address: - - 2014
Based on the original combination of picosecond acoustics and diamond anvils cell, recent improvements to accurately measure hypersonic sound velocities of liquids and solids under extreme conditions are described. To illustrate the capability of this technique, results are given on the pressure and temperature dependence of acoustic properties for three ...
Sun Yiqian Y Department of Ophthalmology, Peking University Third Hospital; Key Laboratory of Vision Loss and Restoration, Ministry of Education, Beijing 100191, - - 2014
Though there have been various methods for harvesting and preserving descemet membrane (DM) and intact endothelium, there is no literature about the morphological evaluation of endothelium after graft preparation for descemet membrane endothelial keratoplasty (DMEK). The aim of this study was to establish and improve a simple method for preparing, ...
Aron Margaret M *Division of Otolaryngology-Head and Neck Surgery, and †Nova Scotia Hearing and Speech Centers, Dalhousie University, Halifax, Nova Scotia, - - 2014
Voluntary eardrum movement (VEM) and resultant tympanometric changes reflect tensor tympani (TT) contraction. TT contraction has been hypothesized to cause symptoms of aural fullness, tinnitus, clicking, and even vertigo despite the lack of understanding of how it functions or what causes it to contract. Identifying tympanometric changes unique to TT ...
Joyce William W Zoophysiology, Department of Biosciences, Aarhus University, DK-8000 Aarhus C, Denmark. Electronic address: - - 2014
Few studies have investigated adenosinergic regulation of the cardiovascular system in reptiles. The haemodynamic effect of a bolus intra-arterial adenosine injection (2.5μMkg(-1)) was investigated in nine anaesthetised red-eared sliders (Trachemys scripta). Adenosine caused a transient bradycardia, which was accompanied by systemic vasodilatation as evidenced by an increase in systemic flow ...
Csakanyi Zsuzsanna Z *Department of Pediatric Otorhinolaryngology, Heim Pal Children's Hospital, 13 Delej utca, H-1089 Budapest, Hungary; †Budapest University of Technology and Economics, 3-9 Műegyetem rkp, H-1111 Budapest, Hungary; ‡Faculty of Engineering, University of Szeged, 13 Dugonics square, H-6720 Szeged, Hungary; and §Department of Otorhinolaryngology and Head and Neck Surgery, Health Science Centre, University of Debrecen, 98 Nagyerdei krt., H-4032 Debrecen, - - 2014
To establish a mathematical model of middle ear gas pressure regulation and to discuss potential implications for pathophysiology-oriented theoretical approach to middle ear surgery, with particular attention to mastoid obliteration. Numerous studies support that small mastoid volume is associated with cholesteatoma. Latest studies show that mastoid obliteration is an effective ...
Bergevin Christopher C Department of Physics & Astronomy, York University, Toronto, Ontario M3J1P3, - - 2014
Sound energy is conveyed to the inner ear by the diaphanous, cone-shaped tympanic membrane (TM). The TM moves in a complex manner and transmits sound signals to the inner ear with high fidelity, pressure gain, and a short delay. Miniaturized sensors allowing high spatial resolution in small spaces and sensitivity ...
Lynch James H JH 1Primary Care Sports Medicine, Special Operations Command Africa, Stuttgart, Germany; and 2Emergency Medicine Residency, Naval Medical Center, San Diego, - - 2014
The human body is well adapted to dealing with small variations in atmospheric pressure. However when our pursuit of sport and recreation takes us to extreme altitudes or ocean depths, the change in surrounding pressure has the potential to cause significant morbidity. Sports with more extreme changes in atmospheric pressure ...
Jáuregui-Renaud Kathrine K Unidad de Investigación Médica en Otoneurología. Edificio C "Salud en el Trabajo" Centro Médico Nacional Siglo XXI, - - 2014
OBJECTIVE. In children aged less than 10 years, to assess whether adenotonsillectomy has some permanent or transitory effect on middle ear pressure. MATERIAL AND METHODS. 20 children aged 4 to 9 years old (13 girls and 7 boys) participated in the study. The day before surgery and on days 1, ...
Massey E Wayne EW Department of Neurology, Duke University Medical Center, Durham, NC, USA. Electronic address: - - 2014
Diving exposes a person to the combined effects of increased ambient pressure and immersion. The reduction in pressure when surfacing can precipitate decompression sickness (DCS), caused by bubble formation within tissues due to inert gas supersaturation. Arterial gas embolism (AGE) can also occur due to pulmonary barotrauma as a result ...
Wear Keith - - 2014
The traditional method for calculating acoustic pressure amplitude is to divide a hydrophone output voltage measurement by the hydrophone sensitivity at the acoustic working frequency, but this approach neglects frequency dependence of hydrophone sensitivity. Another method is to perform a complex deconvolution between the hydrophone output waveform and the hydrophone ...
Weddell Thomas D TD School of Pharmacy and Biomolecular Sciences, University of Brighton, , Brighton BN2 4GJ, - - 2014
The round window (RW) membrane provides pressure relief when the cochlea is excited by sound. Here, we report measurements of cochlear function from guinea pigs when the cochlea was stimulated at acoustic frequencies by movements of a miniature magnet which partially occluded the RW. Maximum cochlear sensitivity, corresponding to subnanometre ...
Ono Kanako K Graduate School of Medicine, Epidemiology and Public Health - - 2014
Abstract We investigated the relationship among 24-h blood pressure (BP), pulse rate (PR) and core temperature by using an ambulatory BP monitoring, a new wristwatch-type pulsimeter with accelerometer (WPA) and an ear thermometer simultaneously. Our results suggest that the ear temperature which reflects the core body temperature was lowest at ...
Santos Izabella Dos ID Universidade Estadual de Campinas, CampinasSP, Brasil, Aprimoramento em Saúde Auditiva, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, - - 2014
Introduction: The use of Personal Digital Audio Players can cause hearing injuries, as the sound is generated directly in the ear canal. It is believed that different types of headphones can cause different amplifications, since they cause changes in the volume and resonance of the ear canal according to their ...
Pacheco Karen K Department of Biology, Carleton University , Ottawa, ON , - - 2014
Understanding female mate preference is important for determining the strength and direction of sexual trait evolution. The sound pressure level (SPL) acoustic signalers use is often an important predictor of mating success because higher sound pressure levels are detectable at greater distances. If females are more attracted to signals produced ...
Mittmann P P Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Warenerstraße 7, 12683 Berlin, - - 2014
To preserve residual hearing in cochlea implantation, the electrode design has been refined and an atraumatic insertion of the cochlea electrode has become one aspect of cochlea implant research. The opening of the round window can be assumed to be a contributing factor in an atraumatic concept. The aim of ...
Todt I I Department of Otolaryngology at UKB, Unfallkrankenhaus Berlin, Warenerstaße, 12683 Berlin, - - 2014
Introduction. To preserve residual hearing the atraumaticity of the cochlea electrode insertion has become a focus of cochlear implant research. In addition to other factors, the speed of insertion is thought to be a contributing factor in the concept of atraumatic implantation. The aim of our study was to observe ...
Song Soohwa S aDepartment of Biomedical Engineering, Hanyang University, Seoul bDepartment of Biomedical Engineering, University of Ulsan, Ulsan, - - 2013
The auscultatory method is influenced by the hearing level of the observers. If the observer has hearing loss, it is possible to measure blood pressure inaccurately by misreading the Korotkoff sounds at systolic blood pressure (SBP) and diastolic blood pressure (DBP). Because of the potential clinical problems this discrepancy may ...
Zou Jing - - 2013
To elucidate the communication between the middle and inner ear, and the fluid dynamics of the inner ear with the perilymphatic fistula (PLF) of the round window membrane (RWM). The PLF of the RWM was created in nine guinea pigs. Gadolinium diethylenetriamine pentaacetic acid bismethylamide (Gd-DTPA-BMA) was delivered into the ...
Foster C A - - 2013
We believe Meniere attacks arise as a chance association of endolymphatic hydrops and vascular risk factors for intracerebral ischemia. Hydrops acts as a variable Starling resistor upon the inner ear vasculature that is capable of inducing ischemic attacks only in people with reduced perfusion pressure in the ear. The unique ...
Duger Cevdet - - 2013
Objective: The aim of the present study was to compare the effects of two inhalation anesthetics, desflurane and sevoflurane, on middle ear pressure. Methods: After we obtained written consent from the patients and the approval from our institutional ethical committee, we included 56 ASA I-II patients aged between 18 and ...
Ravicz Michael E - - 2013
The transfer function HV between stapes velocity VS and sound pressure near the tympanic membrane PTM is a descriptor of sound transmission through the middle ear (ME). The ME power transmission efficiency (MEE), the ratio of sound power entering the cochlea to power entering the middle ear, was computed from ...
Feder Katya K Health Canada, Consumer and Clinical Radiation Protection Bureau, Health Effects and Assessment Division, Ottawa, Ontario, - - 2013
To examine the relationship between portable digital audio player listening behaviours and (1) measured sound pressure levels, (2) audiometric measures, (3) self-reported hearing loss symptoms. A questionnaire to evaluate listening behaviours, including self-reported hearing loss symptoms and listening duration/volume settings. Multivariate regression analysis was used to determine the relationship between ...
Torija Antonio J - - 2013
A subjective and physical categorization of an ambient sound is the first step to evaluate the soundscape and provides a basis for designing or adapting this ambient sound to match people's expectations. For this reason, the main goal of this work is to develop a categorization and differentiation analysis of ...
Shaver Mark D - - 2013
The wideband energy reflectance (ER) technique has become popular as a tool for evaluating middle ear function. Negative middle ear pressure (MEP) is a prevalent form of middle ear dysfunction, which may impact application of ER measurements in differential diagnosis. A negative MEP may be countervailed by application of an ...
Brown D J - - 2013
Various theories suggest endolymphatic hydrops may cause a rupture of the membranous labyrinth or may force open the utriculo-saccular duct, resulting in a sudden change in inner ear function. Here, we have used slow injections of artificial endolymph into either scala media or the utricle of anaesthetised guinea pigs to ...
Silverman Carol A - - 2013
We describe tympanic membrane displacement (TMD) testing for non-invasive estimation of intracranial pressure (ICP). With the TMD test, displacement of the tympanic membrane of the middle ear is recorded during elicitation of the acoustic middle-ear reflex (AR). Increased intracranial/perilymphatic pressure displaces the resting stapes footplate laterally so that TMD during ...
Sleifer Pricila - - 2013
OBJECTIVE:To verify the levels of sound pressure emitted by non-certified children's toys. Cross-sectional study of sound toys available at popular retail stores of the so-called informal sector. Electronic, mechanical, and musical toys were analyzed. The measurement of each product was carried out by an acoustic engineer in an acoustically isolated ...
Taller Daniel - - 2013
The exponentially decaying acoustic pressure of scattered surface acoustic waves (SAWs) at the contact line of a liquid film pinned to filter paper is shown to sustain a high curvature conic tip with micron-sized modulations whose dimension grows exponentially from the tip. The large negative capillary pressure in the film, ...
Gauthier Marianne - - 2013
For the first time, and using an acoustical method, it has been shown experimentally that the inertial cavitation threshold pressure of an albumin-shelled microbubble is significantly correlated with its initial size.
van Dijk Pim P Department of Otorhinolaryngology, Head & Neck Surgery, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands. - - 2013
Small changes of air pressure outside the eardrum of five lizard species led to changes in frequency, level, and peak width of spontaneous otoacoustic emissions (SOAE). In contrast to humans, these changes generally occurred at very small pressures (<20 mbar). As in humans, SOAE amplitudes were generally reduced. Changes of ...
Sivri Bekir - - 2013
OBJECTIVES/HYPOTHESIS: To investigate the effect of continuous positive airway pressure (CPAP) on middle ear pressure in patients with obstructive sleep apnea syndrome (OSAS). STUDY DESIGN: Prospective clinical case-control study. METHODS: Seventy-eight patients with moderate and severe OSAS (the mean apnea-hypopnea indexes were 22.70 ± 3.59 and 48.59 ± 12.50, respectively) ...
Li Lieber Po-Hung - - 2013
OBJECTIVES/HYPOTHESIS: Sound pressure level delivered through personal listening devices (PLDs) and reaching the ear drum might be affected by body size and jaw movements. This study aimed to investigate whether jaw movement and/or smaller body mass index (BMI) resulted in decrease of sound pressure level within the ear canals of ...
Zebian Makram - - 2013
The purpose of this study was to quantify the change in distortion product otoacoustic emission (DPOAE) level upon ear canal pressurization. DPOAEs were measured on 12 normal-hearing human subjects for ear canal static pressures between -200 and +200 daPa in (50 ± 5) daPa steps. A clear dependence of DPOAE levels on ...
Ravicz Michael E ME Eaton-Peabody Laboratory, Massachusetts Eye & Ear Infirmary, 243 Charles Street, Boston, Massachusetts 02114, USA. - - 2013
The middle-ear pressure gain GMEP, the ratio of sound pressure in the cochlear vestibule PV to sound pressure at the tympanic membrane PTM, is a descriptor of middle-ear sound transfer and the cochlear input for a given stimulus in the ear canal. GMEP and the cochlear partition differential pressure near ...
Cros Olivier - - 2013
The mastoid air cell system has traditionally been considered a passive role in gas exchange and pressure regulation the middle ear possibly with some acoustic function. However, more evidence has focused on the mucosa of the mastoid, which may play a more active role in regulation of middle ear pressure. ...
Guan Xiying X School of Aerospace and Mechanical Engineering and Bioengineering Center, University of Oklahoma, Norman, OK 73019, - - 2013
Acute otitis media (AOM) is a rapid infection of middle ear due to bacterial or viral invasion. The infection commonly leads to negative pressure and purulent effusion in the middle ear. To identify how these changes affect tympanic membrane (TM) mobility or sound transmission through the middle ear, we hypothesize ...
Schulz Steffen - - 2013
Previous studies have proposed varying causes for idiopathic sudden sensorineural hearing loss (SSNHL), including vascular occlusion, ruptured inner ear membrane, acoustic tumours and circulatory disturbances in the inner ear. The objective of this study was to characterise the autonomic regulation in 19 SSNHL patients in comparison to 19 healthy age-gender ...
Agarwal Saurabh S Department of ENT and Head and Neck Surgery, Grant Medical College, J.J. Hospital, Room No. 712, Byculla, Mumbai, 400 008 - - 2013
To determine the likely association between hypertension and hearing loss. 150 cases and 124 controls, both genders, aged 45-64, included in the research after sample estimation. Hypertension was verified through blood pressure readings and was classified as grade 1, grade 2 and grade 3 hypertension or no hypertension according to ...
Maxwell Adam D AD Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA. - - 2013
In this study, the negative pressure values at which inertial cavitation consistently occurs in response to a single, two-cycle, focused ultrasound pulse were measured in several media relevant to cavitation-based ultrasound therapy. The pulse was focused into a chamber containing one of the media, which included liquids, tissue-mimicking materials, and ...
Sun Xiao-Ming XM Department of Communication Sciences and Disorders, Wichita State University, Wichita, KS 67260–0075, USA. - - 2013
To test the assumptions concerning the compensation of middle ear pressure (MEP) in using peak Y(tm) and the tympanogram asymmetry phenomenon, and to address the variability and reliability of 226 Hz tympanometry under negative MEP. (1) Repeated measures in normal ears with experimentally-induced negative MEP; (2) Retrospective analysis of clinical ...
Yamada Shinichiro - - 2013
A 51-year-old woman was admitted to our hospital because of the right ear fullness and orthostatic headache. Based on the findings of low cerebrospinal fluid (CSF) pressure and detected images of CSF leakage by MRI myelography and radionuclide cisternography, she was diagnosed as having spontaneous intracranial hypotension (SIH). Audiograms in ...
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