Dissertations / Theses: 'Hearing loss'

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Thys, Noel. "Hearing loss simulation." Thesis, Peninsula Technikon, 2000. http://hdl.handle.net/20.500.11838/1127.

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Thesis (MTech (Electrical Engineering))--Peninsula Technikon, Cape Town, 2000.
This document gives a report on the research that has been done to simulate hearing loss. People working with the hearing impaired have no idea of what and/or how the hearing impaired person hears sound. An instrument that enables a normal hearing person to hear what a hearing impaired person hears, is referred to in this document as a Hearing Loss Simulator (HLS). An investigation of the feasibility and practicability of the abovementioned instrument, has led to the development of the HLS by making use of a distinct type of technology called Digital Signal Processing (DSP) technology. Before hearing loss can be simulated, the hearing loss first needs to be determined. A study of different procedures and methods for screening hearing has led to the incorporation of an existing instrument called an Audiometer. An audiometer is an instrument that determines the hearing loss by making use of pure tone sine waves. The results are then plotted on a graph called an Audiogram. The results of other methods that determine the hearing loss can also be transferred to the Audiogram. The Audiogram's information which is, in fact, the frequency response of the ear, is stored in a computer and is utilized to realize the HLS function. Six different DSP based methods were studied to shape any audio information according to a specific frequency response. The optimum method was identified and then implemented. The various methods are the following: Filter bank method Inverse Discrete Fourier Transforms (IDFT) method Inverse Fast Fourier Transforms (IFFT) method Chirp-z method Wavelet method Yule-walker method The ITFT method was identified as the optimum method and was therefore implemented. The algorithm to realize this method, was carried out by doing the IFFT calculation on computer and subsequently doing the filtering on a DSP processor called an ADSP-2181 processor. The audio information under investigation is fed into the instrument, it is then filtered according to the audiogram information and then sent out again. Any normal hearing person who wants to investigate the hearing impairment of the hearing impaired person can listen to sound reproduction through either a set of headphones or through a free field. This process is referred to in this dissertation as Hearing Loss Simulation.
Foundation of Research and Development

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Davids, Ronel Sanet. "Experiences of hearing parents regarding their child’s hearing loss." University of the Western Cape, 2013. http://hdl.handle.net/11394/4820.

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Magister Artium (Social Work) - MA(SW)
Overwhelming evidence suggests that 90% of children with a hearing loss are born to hearing parents. Research indicates that often these hearing parents are ill-informed about the cause and type of hearing loss their child has, leading the hearing parents to feelings of grief and disempowerment. Many hearing parents at the time of the diagnosis experience emotional turmoil as the diagnosis is often unexpected, resulting in a plethora of questions asked. The research approach for the study was qualitative in nature as it set out to explore and describe the experiences of hearing parents of their child’s hearing loss. A phenomenological strategy of design was employed to capture the lived experience from the hearing parents. Data was collected by means of unstructured individual in-depth interviews with 11 hearing parents. Volunteer and snowball sampling were implemented so as to access hearing parents whose children had been diagnosed with hearing loss. Data was analysed according to Creswell (2007) and Klenke (2008) and the trustworthiness of the qualitative study was evaluated against the criteria that Guba described in Krefting (1991). Ethical considerations, such as voluntary participation, informed consent, confidentiality, anonymity, no harm done and debriefing, were adhered to. After the conclusion of the research analysis, the findings of the research were discussed and recommendations were made. The findings of the recommendations spoke to the better understanding of the emotions and challenges of hearing parents as well as putting forward suggestions for supportive coping mechanisms to be put in place to support hearing parents whose children have been diagnosed with a hearing loss.

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Jones, Nicholas Spencer. "Hyperlipidaemia and hearing loss." Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265047.

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Johnson, Earl E. "Fitting a Hearing Aid to Conductive Hearing Loss and Realistic Expectations When Fitting a Hearing Aid to Sensorineural Hearing Loss." Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/etsu-works/1740.

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Thomas, Elizabeth Anne. "Type 2 diabetes, hearing loss, and contributors to hearing loss in older Mexican Americans." Diss., Search in ProQuest Dissertations & Theses. UC Only, 2009. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3378510.

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Macker, Julie. "Childhood Hearing Loss and its Stress on Hearing Families." ScholarWorks, 2015. https://scholarworks.waldenu.edu/dissertations/1413.

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Childhood disability increases parental stress. Research on the laterality of childhood hearing loss or presence of a cochlear implant(s) as it relates to stress in hearing parents was limited before this study. The purpose of this quantitative study was to identify relationships between the independent variables of laterality (unilateral and bilateral) of a childhood hearing loss or presence of a cochlear implant(s) and the dependent variable of stress in hearing parents. Family systems theory provided a framework for viewing each member of the family as a part of a whole, whose life events, feelings, and actions affect all of the members of the family. For this study, hearing parents of children with a hearing loss living and receiving services in the state of South Carolina rated their personal stress levels by completing an anonymous Likert-scale questionnaire. Data were collected from 151 participants via an online hosting site and analyzed using factor analysis, descriptive statistics, and ANOVA procedures. Hearing parents of children with a cochlear implant(s) (n = 37) scored the highest on all measures of stress except those measuring communication stress. Hearing parents of children with a bilateral hearing loss (n = 56) scored highest on communication stress. Hearing parents of children with a unilateral hearing loss (n = 58) scored lowest on all measures. One of the largest contributing factors to parental stress was the differing opinions educators and medical providers. The findings of this study contribute to positive social change by providing insight into how a childhood hearing loss influences stress in hearing parents. This information may help educators, service providers, and families provide better resources to the family system.

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Al, Jindan Reem Yussuf. "Hearing loss and bacterial meningitis." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499828.

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Vas, Venessa Firmin. "The biopsychosocial impact of hearing loss on people with hearing loss and their communication partners." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/47506/.

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Hearing loss is a prevalent condition that can have negative implications on the day-to-day lives of those with hearing loss, and their communication partners. Several reviews have identified numerous questionnaires that explore the impact of hearing loss, with little consensus among researchers as to their preference. One reason for this is a lack of an agreed framework concerning exactly what is the impact of hearing loss, and what is important to those who live with the condition. To address this gap in understanding, the experiences of those living with hearing loss or with someone that has hearing loss was investigated using various systematic research methods and tools. A comprehensive review of published studies exploring the impact of hearing loss on those with hearing loss and/or their communication partner was conducted. An inductive (data-driven) synthesis of the research evidence led to the development of two frameworks; one for each perspective. Each framework comprised of three higher-level ‘supra-domains’ (i.e. Auditory, Social and Self) which capture the broader implications of hearing loss, and numerous lower-level ‘domains’ and ‘subdomains’ that tap into distinct aspects of life. The frameworks were evaluated for face-validity in focus groups with hearing aid users, communication partners and audiologists. Hearing aid users and communication partners were then asked to rank the domains in order of importance based on their experience of living with hearing loss. The domain ‘communicating’ was ranked most important from both perspectives. A subdomain mutual to both frameworks, ‘raising the volume of the television/radio’ was explored further in a case-control study. The preferred TV volume across 42 couples where one partner was a hearing aid user and the other was a non-hearing aid user was measured. A mean difference in volume preference of 6.3dB was observed between groups across the TV programmes viewed by all participants. The hearing aid prescription of hearing aid users was not verified. Future research should explore how domains in the frameworks are currently being measured and addressed in clinic. Also, data-driven methods should be applied to identify coping mechanisms adopted by people with hearing loss and their partner to accommodate for the diverse range of hearing-related difficulties depicted in the frameworks.

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Madsen, Sara Miay Kim. "Effects of hearing loss and hearing aids on music perception." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709106.

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McKenzie, Andrew Rayner. "An adaptive response hearing aid for high frequency hearing loss." Thesis, University of Southampton, 1988. https://eprints.soton.ac.uk/52267/.

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A new approach to the evaluation of hearing aid fitting has suggested that an adaptive frequency/gain characteristic is subjectively more beneficial for patients with precipitous high frequency hearing loss, listening to speech in the various quiet and noisy situations encountered in everyday life. The development and evaluation of such a hearing aid is described. Parameters for the operation of the adaptive response mechanism were determined experimentally by means of subjective listening tests using subjects with precipitous high frequency hearing loss. Software was compiled to implement these parameters on a specially designed, computer-controlled, master hearing aid system in real time. A novel evaluation procedure was developed in order to assess the benefits provided by this system in terms of objective speech discrimination measures and subjective judgements in simulations of real life listening conditions. Uncertainty about the effects of binaural hearing aid fitting and, in particular, the lack of scientific evidence of any subjective advantages to be gained, led to a secondary study of the benefits of fitting a preferred monaural response binaurally. The hypothesis that the adaptive frequency response hearing aid is more appropriate than a standard fixed frequency response aid for people with precipitous high frequency hearing loss, listening to speech in the variety of quiet and noisy situations encountered in everyday life, was partially upheld in that it was preferred by a significant number of patients with 4kHz hearing loss greater than, or equal to, 65 dBHL. However, for patients with less severe high frequency hearing loss, a flat frequency response was preferred. A secondary hypothesis, that binaural fitting of a person's preferred monaural hearing aid response provides further increases in benefit over those found for the monaural fitting, was upheld. Further findings with important implications for hearing aid fitting, both monaural and binaural, are discussed together with important directions for future work.

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Mpholo, Lebogang Thateng. "Incidence of hearing loss in young and elderly patients following spinal anaesthesia for cystoscopy." Thesis, University of Limpopo ( Medunsa Campus ), 2011. http://hdl.handle.net/10386/415.

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Thesis ( M Med (Anaesthesiology)--University of Limpopo, 2011.
Introduction: Multiple studies have described a variable incidence of transient hearing loss (hypoacousis) from 0.4% to 40% after subarachnoid block, especially in the low-frequencies range (125 – 500 Hz) (1, 2). The mechanism of transient hypoacousis is attributed to leakage of cerebrospinal fluid, which leads to a decrease in perilymph pressure within the cochlear. Hypothesis: The study hypothesis was based on an assumption that hearing loss is more frequent in young patients who undergo spinal anaesthesia in comparison with elderly patients. Objective: 1) To determine the incidence of hearing loss after spinal anaesthesia in the young versus elderly patients. Materials and Methods: Ninety-eight male patients (ASA 1 - 11) scheduled for cystoscopy under spinal anaesthesia were recruited for the study. Recruitment of patients for the study was age-dependent and was divided into two groups: One group (49 patients) had patients aged between 17 and 44 years (Group Y) and the other group had 49 patients aged between 45 and 77 years made up group two (GROUP E). Subarachnoid injection at L3-4 was performed using a standard 22-gauge Quincke spinal needle with patients in the sitting position and 2,5 ml to 3 ml of 0.5% isobaric bupivacaine was administered. Patients were evaluated on the day before spinal anaesthesia by pure tone audiometry at three different frequency sounds viz. 125 – 500 Hz (Low frequency), 500 – 2000 Hz (Speech frequency) and at 2000 – 4000 Hz (High frequency). This assessment was repeated 48 hours after the spinal block was given. Statistical Analysis: Analysis was descriptive providing information on the mean (or median) and standard deviation of the variables for each of the two groups. The results of the audiometry were analyzed using repeated measures analysis of variance and transformation to p-value. Differences in outcomes of the study between the two groups were recorded as being statistically significant if p-value is ≤ 0.05. Results: No patient from the two groups developed hearing loss either at low or high frequencies. However, there was a statistically significant improvement in audiometric results (p-value ranging from 0.0001 and 0.063) 48 hours post-surgery in the elderly group as compared with patients in the younger group. Conclusion: The study revealed no hearing loss post-spinal anaesthesia in both groups. It did, however, show that the elderly group have better hearing acuity at all three frequency levels of sound compared to the younger group after spinal anaesthesia.

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Gallagher, Nicola Emma. "Diet, hearing loss and healthy ageing." Thesis, Queen's University Belfast, 2017. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.726350.

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This thesis aimed to compare self-reported and measured hearing loss by pure-tone audiometry and to determine what factors were associated with dietary intake, hearing loss and hearing-aid uptake and use in older people. This thesis analysed data from two large cohort studies- the Caerphilly Prospective Study and the Northern Ireland Cohort for the Longitudinal Study of Ageing. The main methods involved dietary pattern (DP) analysis, statistical analysis and both quantitative and qualitative analysis of interviews. This thesis found low but significant correlations between self-reported and audiometric measures of hearing loss. Poor dental health was significantly associated with reduced appetite. Diet quality was lower in males, younger older adults, those who were unmarried, widow(er)s, those with lower education and those with a higher BML In general, healthy DPs were associated with a decreased risk of chronic conditions and may be associated with a lower risk of hearing loss, although further work is required to confirm these findings. Hearing loss was significantly associated with a greater risk of depression and loneliness. Being older, having more severe hearing loss and owning a hearing-aid for a longer period of time were associated with greater hearing-aid uptake and use. Qualitative analysis revealed three main themes; factors affecting hearing-aid use. attitudes towards hearing-aids and audiology service. Self-reported measures of hearing loss were found to be acceptable measures of hearing loss, but only when audiological assessment is not feasible. A wide range of factors can adversely affect dietary intake in older people. Further work is necessary to determine the effect of dietary assessment method on DP analysis and the effect of examining a priori and a posteriori methods on observed associations with morbidity risk. More information, follow-up support and scheduled reviews are essential to increase hearing-aid uptake and use in older people.

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Cullen, J. R. "Sudden hearing loss : an animal model." Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326426.

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Winter, Andrew John. "Hearing loss in experimental bacterial meningitis." Thesis, University of Birmingham, 1997. http://etheses.bham.ac.uk//id/eprint/32/.

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Experimental meningitis was induced in pigmented guinea pigs by subarachnoid inoculation of \(1 \times 10^9\) Escherichia coli K-12 or \(3 \times 10^7\) CFU Streptococcus pneumoniae serotype 2 D39 (NCTC 7466) or PLN-A, \(\Delta\)NA1 or \(\Delta\)HY1, defined isogenic derivatives of D39 deficient in pneumolysin, neuraminidase or hyaluronidase respectively. All animals developed a meningeal inflammatory response and a labyrinthitis. Hearing loss in pneumococcal meningitis was measured by recording the evoked auditory nerve compound action potential from the round window membrane. Animals infected with PLN-A sustained significantly less hearing loss than those infected with wild-type D39 (12 dB vs. 50 dB 12 h post inoculation; P<0.0001), Neuraminidase deficiency did not alter the course of the meningeal inflammatory response nor affect hearing loss. The \(\Delta\)HY1 mutant survived poorly in the cerebrospinal fluid and blood but still caused hearing loss. Both pneumococcal and E. coli meningitis induced specific ultrastructural lesions in the organ of Corti as judged by high-resolution scanning and transmission electron microscopy, and these lesions were most severe with pneumolysin-sufficient pneumococcal infection. Microperfusion of \(5\times10^6\) CFU S.pneumoniae D39 directly into the scala tympani of guinea pigs also resulted in electrophysiological and ultrastructural damage to the organ of Corti that could be diminished by pretreatment with antibiotics. The data confirm the cochlea as the site of meningogenic deafness. They suggest that pneumolysin expression is chiefly responsible for meningogenic deafness and that if pneumococci invade the inner ear during bacterial meningitis, cochlear deafhess will rapidly ensue.

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Hilton, Jennifer Maglona. "Progressive hearing loss in mouse mutants." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610680.

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Tan, Christine Marie. "Tinnitus and patterns of hearing loss." Thesis, University of Essex, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.549282.

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Seeman, Scott E. "Informational Masking and Sensorineural Hearing Loss." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250704738.

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McCombe, Andrew Wightman. "Wind noise, hearing loss and motorcyclists." Thesis, University of Edinburgh, 1994. http://hdl.handle.net/1842/20669.

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An investigation was undertaken to establish the source and effects of noise to which motorcyclists are exposed. Various methods of noise reduction and their effects have also been assessed. It would appear that at about 40mph, wind noise caused by turbulent airflow around the rider's helmet becomes the dominant sound source, exceeding the vehicle noise and the safe occupational maximum of 90dB(A). It continues to increase, linearly with log10 speed, to reach levels of 110dB(A) at 100mph. Wind tunnel work indicates that the source of this noise is random pressure fluctuations in the thin boundary layer adjacent to the helmet shell. As currently designed crash helmets provide no useful attenuation against this low frequency noise. These sound levels cause significant temporary threshold shift after only 1 hour of typical motorway speed riding and, with time, significant permanent hearing loss in up to 45% of motorcyclists. Most riders are unaware of this noise problem; only 15-25% of riders regularly wear earplugs, which are currently the only available protection, although providing a set of earplugs with a new crash helmet at the point of sale can significantly improve the usage rate to 85%. Efforts to try and produce a "quiet" helmet using a variety of aerodynamic modifications have been consistently unsuccessful. However, incorporating a set of standard earmuffs under the helmet shell has achieved highly significant reductions in "at ear" wind noise levels. A working prototype using earmuffs and a pneumatic control system now exists and should ultimately prove to be the most acceptable solution to this unpleasant problem.

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Grinstead, Geraldine LaCourt. "The relationship between self-reported hearing handicap and hearing loss formulae /." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487586889190317.

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Arioz, Umut. "Developing Subject-specific Frequency Lowering Algorithms With Simulated Hearing Loss For The Enhancement Of Sensorineural Hearing Loss." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614929/index.pdf.

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The hearing and understanding problems of the people with high frequency hearing loss are covered within the scope of this thesis. For overcoming these problems, two main studies, developing hearing loss simulation (HLS) and applying new frequency lowering methods (FLMs) were carried out. HLS was developed with the suprathreshold effects and new FLMs were applied with different combinations of the FLMs. For evaluating the studies, modified rhyme test (MRT) and speech intelligibility index (SII) were used as subjective and objective measures, respectively. Before both of the studies, offline studies were carried out for specifying the significant parameters and values for using in MRT. For the HLS study, twelve hearing impaired subjects listened to unprocessed sounds and thirty six normal hearing subjects listened to simulated sounds. In the evaluation of the HLS, both measures gave similar and consistent results for both unprocessed and simulated sounds. In FLMs study, hearing impaired subjects were simulated and normal hearing subjects listened to frequency lowered sounds with the specified methods, parameters and values. All FLMs were compared with the standard method of hearing aids (amplification) for five different noisy environments. FLMs satisfied 83% success of higher speech intelligibility improvement than amplification in all cases. As a conclusion, the necessity of using subject-specific FLMs was shown to achieve higher intelligibility than with amplification only. Accordingly, a methodology for selection of the values of parameters for different noisy environments and for different audiograms was developed.

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Daney, Samantha. "Improving Outcomes for Children At-Risk for Hearing Loss." University of Toledo / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1470233353.

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Priwin, Claudia. "Bone anchored hearing aids (BAHAs) in children /." Stockholm, 2006. http://diss.kib.ki.se/2006/91-7140-757-X/.

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Köbler, Susanne. "Bilateral hearing aids for bilaterally hearing-impaired persons - always the best choice? /." Stockholm, 2007. http://diss.kib.ki.se/2007/978-91-7357-067-1/.

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Bredenkamp, Corné-Louise. "Age related hearing loss and conversation before and after hearing aid fitting /." Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-10222007-143520.

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Stegman, Robin Fern. "Hearing Parents of Children With Hearing Loss: Perceptions of the IEP Process." ScholarWorks, 2016. https://scholarworks.waldenu.edu/dissertations/2336.

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This phenomenological study investigated the nature and extent of the support parents received during IEP development. The study was informed by Bronfenbrenner's ecological systems theory. Participants, located in a Northeastern state, were 10 hearing parents of children who had been diagnosed with hearing loss at birth and were between ages 5 and 12. Data were in-depth interviews that were analyzed, coded, and organized into themes using an inductive approach to analysis informed by Hatch. Results indicated that parents believed they needed more guidance on what to expect during the first IEP meeting, that advocating for appropriate accommodations for their child was important, and that education professionals communicate in a more compassionate and less business-like manner when speaking with parents. Parents also indicated increased anxiety due to their perceptions that education professionals have inadequate knowledge about issues relating to hearing loss and hearing amplification technology. Based on these results, special education professionals and policy makers can focus on increased understanding of hearing loss and amplification use in order to help children with hearing loss achieve more positive educational outcomes effecting positive social change.

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Nakashima, T., T. Yoshida, S. Nakata, M. Teranishi, I. M. Ishida, S. Naganawa, and M. Sugiura. "Vestibular aqueduct in sudden sensorineural hearing loss." Cambridge University Press, 2008. http://hdl.handle.net/2237/14312.

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Phelan, Valerie Ann. "Risk factors for hearing loss in adolescents." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ62932.pdf.

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Pussegoda, Kusala. "The pharmacogenomics of cisplatin-induced hearing loss." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/42203.

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Cisplatin is a widely used chemotherapeutic agent for the treatment of solid tumours. A serious complication of cisplatin treatment is permanent hearing loss. The study hypothesis is that genetic variants in genes involved in drug metabolism and transport can contribute to increased susceptibility to hearing loss in pediatric oncology patients treated with cisplatin. Patients were recruited from across Canada through the Canadian Pharmacogenomics Network for Drug Safety (CPNDS). Recently, our group identified several predictive genetic variants that were highly associated with cisplatin-induced hearing loss in children. We evaluated whether we could replicate these findings in a new independent cohort of 155 pediatric patients. Associations were replicated for genetic variants in TPMT (rs12201199, P=0.0013, Odds Ratio, OR 6.1) and ABCC3 (rs1051640, P=0.036, OR 1.8). A predictive model combining variants in TPMT, ABCC3 and COMT with clinical variables significantly improved the prediction of risk of developing hearing loss compared to clinical risk factors alone (P=0.00048). We next evaluated whether we could identify additional genetic variants that confer susceptibility to cisplatin-induced hearing loss. We identified novel variants in ABCB5 (rs10950831, P=1.06×10⁻⁶, OR 2.0) and DPYD (rs6667550, P=0.0047, OR 1.9) that were significantly associated with cisplatin-induced hearing loss. We included these variants into the initial genetic model that consists of variants in TPMT, ABCC3 and COMT to evaluate whether we could improve the prediction of risk. We demonstrate that the risk of prediction of hearing loss significantly improves by including genetic variants in ABCB5 and DPYD (P=0.0023). We also demonstrate that by combining the clinical and genetic factors we can significantly improve the prediction of risk of hearing loss compared to clinical factors alone (P=2.63x10⁻⁷). We were able to replicate previously described findings and also provide evidence for novel genetic variants in the prediction of cisplatin-induced hearing loss in children. Furthermore, this study demonstrates that predictive models can classify patients based on predicted risk of cisplatin-induced hearing loss. These findings have the potential to influence treatment modifications for cisplatin therapy and may improve safety in children.

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Richardson, Martin Paul. "Hearing loss during bacterial meningitis in children." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243780.

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Cheung, Mei-chi Dilys, and 張美詞. "Noise-induced hearing loss: conservation and effects." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31253106.

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Jordan, Chris Gyula. "Noise induced hearing loss in occupational motorcyclists." Thesis, University of Ulster, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414070.

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Lum, David Soleau. "Further evaluation of a hearing loss simulator." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36988.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
Includes bibliographical references (p. 74-76).
by David Soleau Lum.
M.Eng.

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Cheung, Mei-chi Dilys. "Noise-induced hearing loss : conservation and effects /." Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B14709223.

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Sahota, Raguwinder Singh. "Noise-induced hearing loss : treatment and prevention." Thesis, University of Leicester, 2017. http://hdl.handle.net/2381/40043.

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Noise-induced hearing loss (NIHL) is one of the most common sensory disabilities in humans. NIHL is ranked as the world's top industrial injury and a significant cause of hearing loss in teenagers, thus affecting many age groups. This research is timely since a recent study has demonstrated that NIHL has increased dramatically in adolescents, with a 30% increase in this group in the past 10 years, thus coining the term “MP3” generation. The implications of the "MP3" generation will lead to increasing long-term health costs and life-long hearing problems necessitating the use of hearing aids from a young age. Research has shown that exposure to acoustic trauma causes an increase in metabolic activity within the inner ear, with a initial peak in free radical production during the acoustic trauma (within hours) followed by a secondary peak at seven to 10 days after the trauma. Free radicals cause decreased cochlear blood flow, excitotoxic neuronal swelling, and induction of cell death within the inner ear. Recent studies have demonstrated that antioxidant treatments can scavenge free radicals and thus attenuate downstream effects of free radical production. While this has been a major breakthrough for NIHL research, the specific roles played by the different classes of free radicals (reactive nitrogen/oxygen species) remains unclear. The aims of this project were: AIM 1: To determine whether inhibition of reactive nitrogen species can prevent NIHL, using taurine as a nitric oxide scavenger. AIM 2: To establish if there was a dose-dependant response to any effect observed. The research directly addresses a prominent and recognised otolaryngological disease that affects mental and social health. The long-term goal is to develop a pharmaceutical therapy for NIHL to ultimately prevent a debilitating disease and improve human health. Our work also looks at early use of stem cell therapies to repair after acoustic trauma.

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Eager, Katrise Mary. "Rehabilitation of unilateral profound sensorineural hearing loss with a bone anchored hearing aid." University of Western Australia. School of Surgery, 2010. http://theses.library.uwa.edu.au/adt-WU2010.0061.

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The long-term outcomes of subjects fitted with a bone anchored hearing aid (BAHA) for a unilateral profound sensorineural hearing loss (UPSHL) are still evolving. Previous studies have focused on the comparison between shortterm outcomes obtained with hard-wired contralateral routing of signal (CROS) hearing aids and those obtained with BAHA devices. Published results on subjects who have worn their BAHA devices for UPSHL for more than twelve months are limited. This study explored the long-term outcomes of adults fitted with a BAHA for UPSHL. The aims were firstly to examine subjects' pre-operative and postoperative speech perception in quiet and noise, as well as administer two standardised questionnaires, the Abbreviated Profile of Hearing Benefit (APHAB) and the Glasgow Hearing Aid Benefit Profile (GHABP). The second aim was to evaluate the responses of implanted subjects following the preoperative test protocols using a supplementary questionnaire, the Single Sided Deafness Questionnaire (SSDQ). The third aim was to monitor the subjects' implant or repair issues. In addition, questionnaire results were compared to subjects who underwent pre-operative assessment but were not implanted. All subjects had a UPSHL resulting from various aetiologies including vestibular schwannoma or other skull base tumour removal, viral infections, cochlear trauma, idiopathic sudden hearing loss, and Meniere's disease. There was a significant difference between the implanted groups' pre- and post-operative outcomes measures, indicating a treatment effect from the fitting of the BAHA device. No significant changes were found with the non-implanted groups' longterm outcome measures in regards to their perceived hearing difficulties. No significant correlations were found between outcome measures and gender, age of fitting, length of deafness, or ear affected for either group.

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Davids, Ronel Sanet. "The development of guidelines for hearing parents parenting a children with hearing loss." University of the Western Cape, 2020. http://hdl.handle.net/11394/7736.

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Philosophiae Doctor - PhD
Parenting children with a hearing loss presents hearing parents with unique parenting challenges. Adapting to and managing these challenges is dependent on parents’ personal and social support as well as the resources available to them. There is limited research regarding hearing parents’ personal and social support and access to appropriate resources. In order to bridge this gap, the aim of the study was to develop guidelines for hearing parents parenting children with a hearing loss. A mixed methods approach with a sequential explanatory design using a two-phased approach was employed in this study. Phase 1 endeavoured to identify the problem and explore the needs of parents by using a staged approach. The sample in this phase included 103 participants in the quantitative study and 13 participants in the qualitative study. Phase 2 applied a consensus workshop made up of two rounds: Round 1 comprised a panel of experts, namely, academics in the field of child, family, and disability studies, and Round 2 included a panel of stakeholders comprised of hearing parents, professionals, Deaf mentors, and leaders working within the field of hearing loss. The purpose of the workshop was to reach consensus on the development of guidelines. From this research, a number of guidelines emerged for parents, focusing on:1) early intervention programmes for hearing parents and children diagnosed with a hearing loss, highlighting guidance and counselling for parents on early identification and screening programmes; 2) the need for social and emotional support to deal with the emotional impact of the diagnosis on the family, the parents, as well as the child with a hearing loss; 3) access to resources and information which is comprehensive and unbiased, allowing parents to make informed choices; and 4) support for communication intervention whereby parents are offered unbiased support in terms of communication options for their children. This study has important implications for the collaboration and partnerships between parents, social services (social workers), and health and family practitioners for the provision of family-centred practices.

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Schairer, Kim, Douglas H. Keefe, Denis Fitzpatrick, Daniel Putterman, Elizabeth Kolberg, Angie Garinis, Michael Kurth, Kara McGregor, Ashley Light, and M. P. Feeney. "Wideband Transient Otoacoustic Emissions in Ears with Normal Hearing and Sensorineural Hearing Loss." Digital Commons @ East Tennessee State University, 2018. https://doi.org/10.1121/1.5068081.

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Otoacoustic emissions (OAEs) are generated in the cochlea in response to sound and are used clinically to separate ears with normal hearing from sensorineural hearing loss (SNHL). OAEs were elicited at ambient pressure by clicks (CEOAE) and wideband chirps (TEOAE) sweeping from low-to-high frequency with a sweep rate of either 187.6 Hz/ms (short chirps) or 58.2 Hz/ms (long chirps) and a bandwidth extending to 8 kHz. Chirps were presented at the same sound exposure level (SEL) as clicks, or + 6 dB relative to clicks. A total of 288 OAE waveforms were averaged for short chirps in ~1 minute compared to 120 waveforms for long chirps. Compared to clicks, the chirp has a lower crest factor, which allows it to be presented at an overall higher SEL without distortion. OAEs were elicited in 79 adults with normal hearing and 51 adults with mild-to-moderate SNHL. One-sixth octave OAE signal-to-noise ratios from 0.7 to 8.0 kHz were compared across stimulus types and conditions. The area under the receiver operating curve (AUC) was used to assess the accuracy of detecting SNHL. Average AUCs across 1/6th octave frequencies ranged from 0.90 to 0.89 for TEOAEs and were 0.87 for the CEOAE suggesting excellent test performance.

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Olsen, Henrik L. "Supra-threshold hearing loss and wide dynamic range compression /." Stockholm, 2004. http://diss.kib.ki.se/2004/91-7349-921-8.

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Granberg, Sarah. "Functioning and disability in adults with hearing loss : the preparatory studies in the ICF Core sets for hearing loss project." Doctoral thesis, Örebro universitet, Institutionen för hälsovetenskap och medicin, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-45274.

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Hearing loss (HL) is a health condition that affects more than 360 million people worldwide. The findings from previous research point at the adverse relationship between adults with hearing loss and important aspects of everyday life such as social relations, communication and work-related tasks. However, the overall picture concerning the functional and disabling aspects of adults with HL re- mains incomplete. To identify the functional and disabling aspects, a conceptual and/or theoretical framework is required. The International Classification of Functioning, Disability and Health (ICF) offer a multidimensional framework based on bio-psycho-social assumptions about health. In previous research inves- tigations in which the ICF has been used, some utility problems in the linking (relating) of data to the classification have been highlighted. The aims of the present thesis were to explore the areas of functioning and disability of relevance for adults with HL and to explore how audiological data can be linked to ICF. The aims were explored by applying the methodology of the ‘interdisciplinary evidence-based approach to functioning and disability in adults with HL’, acknowledging the merging of three perspectives designated the Researcher, the Patient and the Professional perspective. Four studies that focus on the three perspectives were conducted. All results were linked to the ICF classification. The results were merged into a model designated ‘the integrative model of functioning and disability in adults with HL’. When the three perspectives were linked, the results revealed several aspects of relevance for the target group. Bodily (individual) dimensions, such as hear- ing, auditory perception, memory, attention, energy, and emotions, were acknowledged. Aspects of everyday life such as conversations, the usage of communication strategies, family relationships and work, were highlighted. Influential environmental factors, such as noise, assistive technical devices, the design of public buildings, social support and the attitudes of people in the envi- ronment, were also identified. In conclusion, interactions seemed to be vital as almost all identified aspects highlighted or were tied to this dimension of human functioning. Further, concerning the linking of the data it was acknowledged that the ICF and the research area of adult HL do not fully comply. Suggestions for improvements in future revisions of the ICF were highlighted and discussed.

Funding agency: Oticon Foundation; Hörselforskningsfonden (Swedish HearingResearch Foundation); the Foundation for Audiological Research (FAR) Forskningskommitten, Region Örebro County

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Pereira, Sónia Lopes. "Sudden sensorineural hearing loss : evaluation of co-morbidities and potential clinical associations." Master's thesis, Faculdade de Ciências Médicas, 2013. http://hdl.handle.net/10362/10862.

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RESUMO: A surdez súbita (SS) caracteriza-se por uma perda abrupta de audição, mais frequentemente unilateral e associada a sensação de preenchimento aural, acufenos e vertigem. Afecta 5-20/100.000pessoas/ano (sobretudo adultos em fase activa na década de 40), com grande impacto na qualidade de vida. Possíveis causas incluem doenças infecciosas, circulatórias, traumáticas, imunológicas, neoplásicas, neurológicas, tóxicas e cocleares. No entanto, a causa da SS permanece desconhecida na maioria dos casos (80%), o que origina tratamentos controversos e frequentemente ineficientes. Os tratamentos disponíveis variam desde corticosteróides a antivirais, vasodilatadores, anti-agregantes, anticoagulantes, vitaminas e oxigénio hiperbárico (OHB). Atendendo a falta de informação relativa à etiologia e fisiopatologia da SS, pretendemos avaliar a evolução clínica dos doentes com SS tratados com OHB no Centro de Medicina Subaquática e Hiperbárica (CMSH) de Lisboa entre 2000 e 2005, durante um período mínimo de 5 anos, na tentativa de identificar eventuais factores de risco ou noxas clínicas com a SS. O estudo retrospectivo proposto baseia-se na revisão de processos clínicos do CMSH e na aplicação telefónica de questionários médicos de “follow-up” confidenciais – tanto a doentes (grupo de estudo), como aos respectivos esposos/companheiros/membros próximos da família (grupo de controlo) –, com particular ênfase nos antecedentes médicos e história clínica actual. Um estudo preliminar de 20 pessoas (10 doentes e 10 controlos) foi efectuado para antecipar dificuldades e estimar as necessidades logísticas. As dificuldades identificadas foram: 1) selecção dos doentes com números de telefone válidos e processos clínicos completos (com audiograma inicial e final); 2) contacto telefónico com os participantes de ambos os grupos (de estudo e controlo); 3) recursos humanos requeridos. Dado que a SS não é uma doença em si, mas um sintoma de uma doença subjacente, acreditamos que este estudo epidemiológico seja importante e útil, capaz de gerar novas luzes sobre a fisiopatologia e mecanismos desta entidade clínica.-------------ABSTRACT:Sudden sensorineural hearing loss (SSHL) is characterized by abrupt, mostly unilateral loss of hearing, frequently associated to aural fullness, tinnitus and vertigo. It affects 5-20/100.000 people/year (particularly working adults in the 40ths), with huge impact on quality of life. Possible causes include infectious, circulatory, traumatic, immunologic, metabolic, neoplastic, neurologic, toxic and unidentified cochlear diseases. Nevertheless, SSHL’s etiology remains unknown in most cases (80%), giving rise to controversial (and frequently ineffective) treatments. Available therapies range from corticosteroids to antivirals, vasodilators, antiaggregants, anticoagulants, vitamins and hyperbaric oxygen (HBO). Given the lack of data concerning SSHL’s etiology and physiopathology, we intend to evaluate clinical evolution of such patients treated with HBO in the Underwater and Hyperbaric Medical Center (UHMC) at Lisbon from 2000 to 2005 during a minimum period of 5 years, in an attempt to identify eventual risk factors or clinical associations to SSHL. The intended retrospective study is based on the review of patients’ medical charts from UHMC and confidential follow-up questionnaires applied telephonically both to patients (study group) and patients’ spouse/partner/close family member (control group), focusing past and present medical history. A preliminary study of 20 subjects (10 of each group) was performed to anticipate difficulties and to estimate the required logistics. The identified difficulties were: 1) selection of subjects with valid phone numbers and complete medical charts (with initial and final audiograms); 2) telephonic contact with subjects from the study and control group; 3) human logistics required. As it is believed that SSHL is not a disease by itself but rather a symptom of an underlying disease, we believe that this epidemiologic study is important and will hopefully generate sound scientific knowledge concerning physiopathology and mechanism of disease of SSHL.

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Cohen, Romy. "Influential factors in driving confidence among hearing-impaired older adults in Cape Town." Master's thesis, Faculty of Health Sciences, 2020. http://hdl.handle.net/11427/32182.

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Research has shown that age-related hearing loss may have profound implications on all aspects of an individual's life, including cognitive abilities. The relationship between hearing loss and cognition has led to research which indicates an association between objective hearing loss and reduced driving performance in older adults. However, little research exists on the relationship between self-perceived hearing loss and driving confidence, particularly in the South African context. The current study aimed to identify possible associations between driving confidence and hearing loss, age, sex and driving safety among older adults. Data analysis indicated a significant increase in driving confidence after one month of first-time hearing aid use. An insignificant or weak relationship was found between self-perceived hearing loss and level of driving confidence. Age, sex and a combination of both were significantly associated with level of driving confidence. No association was found between pure-tone average and level of driving confidence or between pure-tone average and driving safety. Further research in this area could assist in advising legislation relating to licensing and road safety campaigns targeted at older adults, as well as expanding audiologists' duty of care to include counselling on the potential positive effects of hearing aid use on driving confidence.

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Aas, Sverre, and Tron Vedul Tronstad. "Diffusion-Based Model for Noise-Induced Hearing Loss." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8761.

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Among several different damaging mechanisms, oxidative stress is found to play an important role in noise-induced hearing loss (NIHL). This is supported by both findings of oxidative damage after noise exposure, and the fact that upregulation of antioxidant defenses seem to reduce the ears susceptibility to noise. Oxidative stress mechanisms could help explain several of the characteristics of NIHL, and we therefore believe that it would be advantageous to estimate noise-induced hearing impairment on the basis of these, rather than the prevailing energy based methods. In this thesis we have tried to model progress of NIHL using diffusion principles, under the assumption that accumulation of reactive oxygen species (ROS) is the cause of hearing impairment. Production, and the subsequent accumulation, of ROS in a group of outer hair cells (OHCs) is assessed by different implementations of sound pressure as in-parameter, and the ROS concentration is used in estimation of noise-induced threshold shift. The amount of stress experienced by the ear is implemented as a summation of ROS concentration with different exponents of power. Measured asymptotic threshold shift (ATS) values are used as a calibrator for the development of threshold shifts. Additionally the results are evaluated in comparison to the standards developed by the International Organization for Standardization (ISO) and the American Occupational Safety and Health Administration (OSHA). Results indicate that ROS production is not directly proportional to the sound pressure, rather anaccelerated formation and accumulation for increasing sound pressure levels (SPLs). Indications are also that the correlation between concentration of ROS and either temporary threshold shift (TTS) and/or permanent threshold shift (PTS) is more complex than our assumption. Because our model is based on diffusion principles we get the same tendency of noise-induced hearing loss development as experimentally measured TTS development. It also takes into account the potentially damaging mechanisms which occur during recovery after exposure, and has the ability to use TTS data for calibration. We therefore suggest that modeling of ROS accumulation in the hair cells could be used advantageously to estimate noise-induced hearing loss.

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Fedt, Lauren Alexandra, and Lauren Alexandra Fedt. "Teleaudiology: Clinical Outcomes from Adults with Hearing Loss." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/625383.

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Outside of major metropolitan areas, Arizona has limited options for hearing healthcare. The Arizona Affordable Hearing Aid Task Force proposed the development of a statewide program to provide low-cost hearing aids and audiologic care to low-income residents. The purpose of this review was to determine the status of the literature on the clinical outcomes of teleaudiology services for evaluations and hearing aid fittings which could be used to serve inhabitants of rural counties and address the goals of the Task Force. A literature search was performed to identify articles with original research in teleaudiology in the areas of evaluation and treatment and yielded 234 results. After exclusion criteria were applied, there were 15 articles for review; 10 articles focused on audiological evaluation and 5 articles focused on verification, validation, and counseling for hearing aid fittings. Evaluation-related articles showed that pure-tone air conduction testing was generally within the ± 5 dB acceptable range of variability, with little evidence on bone conduction or speech testing reliability. Studies reporting real-ear measurements with probe microphones were shown to yield similar results in traditional and teleaudiology fitting sessions and validation measures documented similar or better outcomes from teleaudiology fittings. Based on the literature, it is concluded that the use of teleaudiology is feasible for hearing aid fittings and counseling in rural areas, if associated barriers related to costs and limitations related to the availability of technology are overcome.

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Dahlström, Jennie, and Hanna Frohm. "Individual Experiences of Hearing Loss in South Africa." Thesis, Örebro universitet, Hälsoakademin, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-11032.

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Leung, Kwong-ki. "Hearing loss in school children with down syndrome." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B3798679X.

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Harris, Lori Gayle. "Social-Emotional Development in Children with Hearing Loss." UKnowledge, 2014. http://uknowledge.uky.edu/commdisorders_etds/4.

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Many positive outcomes have been documented for children with hearing loss utilizing current treatment approaches such as early identification and intervention, including appropriately fit sensory devices and communication modes that focus on listening and spoken language. However, challenges related to social-emotional development have been widely observed. The development of communication skills in children with hearing loss is impacted by many factors, including the degree of hearing loss, the child's age at onset and identification, the presence of other disabilities, and when the child receives intervention. While there are a variety of therapeutic options available for children with hearing loss to develop communication skills, listening and spoken language is of particular interest to parents with normal hearing. In addition to affecting social competence and participation, problems with social-emotional development are linked to poor academic performance. This study examined the social-emotional development of a small group of young children who communicated using listening and spoken language as measured by parent and caregiver report. Three psychosocial scales were used to evaluate the children's social-emotional development in comparison to peers. These results were analyzed within the context of other demographic variables. One of the five children was identified as facing problems with social-emotional development.

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Leung, Kwong-ki, and 梁廣基. "Hearing loss in school children with down syndrome." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B3798679X.

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Graf, Isaac John 1972. "Simulation of the effects of sensorineural hearing loss." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42761.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
Includes bibliographical references (leaves 103-112).
by Isaac John Graf.
M.S.

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Asbeck, Alan T. (Alan Thomas) 1980. "Analysis of frequency-smearing models simulating hearing loss." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/87379.

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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
Includes bibliographical references (leaves 189-191).
by Alan T. Asbeck.
M.Eng.

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li, yiwen. "Predicting Hearing Loss Using Auditory Steady-State Responses." Digital WPI, 2009. https://digitalcommons.wpi.edu/etd-theses/84.

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Auditory Steady-State Response (ASSR) is a promising tool for detecting hearing loss. In this project, we analyzed hearing threshold data obtained from two ASSR methods and a gold standard, pure tone audiometry, applied to both normal and hearing-impaired subjects. We constructed a repeated measures linear model to identify factors that show significant differences in the mean response. The analysis shows that there are significant differences due to hearing status (normal or impaired) and ASSR method, and that there is a significant interaction between hearing status and test signal frequency. The second task of this project was to predict the PTA threshold (gold standard) from the ASSR-A and ASSR-B thresholds separately at each frequency, in order to measure how accurate the ASSR measurements are and to obtain a ¡°correction function¡± to correct the bias in the ASSR measurements. We used two approaches. In the first, we modeled the relation of the PTA responses to the ASSR values for the two hearing status groups as a mixture model and tried two prediction methods. The mixture modeling was successful, but the predictions gave disappointing results. A second approach, using logistic regression to predict group membership based on ASSR value and then using those predictions to obtain a predictor of the PTA value, gave successful results.

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Dissertations / Theses on the topic 'Hearing loss'

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