[PDF] A Comparison Between Auditory Thresholds Obtained By Conventional Audiometry eBook

Author : National Research Council
Publisher : National Academies Press
Page : 321 pages
File Size : 41,99 MB
Release : 2004-12-17
Category : Social Science
ISBN : 0309092965

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Millions of Americans experience some degree of hearing loss. The Social Security Administration (SSA) operates programs that provide cash disability benefits to people with permanent impairments like hearing loss, if they can show that their impairments meet stringent SSA criteria and their earnings are below an SSA threshold. The National Research Council convened an expert committee at the request of the SSA to study the issues related to disability determination for people with hearing loss. This volume is the product of that study. Hearing Loss: Determining Eligibility for Social Security Benefits reviews current knowledge about hearing loss and its measurement and treatment, and provides an evaluation of the strengths and weaknesses of the current processes and criteria. It recommends changes to strengthen the disability determination process and ensure its reliability and fairness. The book addresses criteria for selection of pure tone and speech tests, guidelines for test administration, testing of hearing in noise, special issues related to testing children, and the difficulty of predicting work capacity from clinical hearing test results. It should be useful to audiologists, otolaryngologists, disability advocates, and others who are concerned with people who have hearing loss.

Author : Ngan-Kam Kammy Yeung
Publisher : Open Dissertation Press
Page : 42 pages
File Size : 15,62 MB
Release : 2017-01-27
Category : Medical
ISBN : 9781374724549

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This dissertation, "Prediction of Hearing Thresholds: Comparison of Cortical Evoked Response Audiometry and Auditory Steady State Response Audiometry Techniques" by Ngan-kam, Kammy, Yeung, 楊銀金, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of dissertation entitled Prediction of Hearing Thresholds: Comparison of Cortical Evoked Response Audiometry and Auditory Steady State Response Audiometry Techniques Submitted by Yeung, Ngan Kam Kammy for the degree of Master of Science in Audiology at the University of Hong Kong in May 2004 The aim of the present study is to evaluate how well cortical evoked response audiometry (CERA) and auditory steady state response (ASSR) thresholds predict behavioral pure tone audiometric (PTA) thresholds at octave frequencies between 500 and 4000 Hz. 34 adult subjects aged 18 or above with normal hearing or sensorineural hearing loss ranging from mild to profound level were recruited. 63 ears met the test criteria for PTA, CERA and ASSR testing. In addition to overall analyses, these ears were divided into 3 groups (normal hearing, mild to moderately severe hearing loss, and severe to profound hearing loss) according to their average PTA thresholds for individual group analyses. CERA results measured using tone burst stimuli, and ASSR results measured using 100% amplitude modulated and 10% frequency modulated tone stimuli at a modulation frequency of 40 Hz were compared with reference to PTA thresholds. Overall correlations of CERA and ASSR thresholds with PTA thresholds were high, with viii Pearson r coefficients exceeding .97 and .95 respectively for each of the test frequency. Individual group correlations, however, were significant at all test frequencies only in the hearing impaired groups. CERA and ASSR thresholds differed significantly from PTA thresholds in the normal hearing group. In addition, overall and individual group mean discrepancies between CERA and PTA thresholds were in general less than those between ASSR and PTA thresholds. 78.2% of the test ears had CERA thresholds within 10 dB of PTA thresholds and 71.0% of test ears had ASSR thresholds within 15 dB of PTA thresholds, showing that CERA thresholds better predicted PTA thresholds than ASSR thresholds. Results of the present study confirmed findings from previous research that both ASSR and CERA testing were accurate in predicting PTA thresholds for adult subjects with sensorineural hearing loss, but not as accurate for those with normal hearing. A closer agreement was exhibited between CERA and PTA thresholds than between ASSR and PTA thresholds using the same subjects. ix DOI: 10.5353/th_b3049431 Subjects: Audiometry, Evoked response Auditory evoked response

Author : M. K. Cheung
Publisher : Open Dissertation Press
Page : 34 pages
File Size : 34,3 MB
Release : 2017-01-27
Category : Medical
ISBN : 9781374729667

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This dissertation, "Prediction of Hearing Thresholds: a Comparison of Chinese Hearing in Noise Test and Cortical Evoked Response Audiometry" by M K, Cheung, 張文娟, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of dissertation entitled Prediction of Hearing Thresholds: A Comparison of Chinese Hearing in Noise Test and Cortical Evoked Response Audiometry submitted by Carol M. K. Cheung for the degree of Master of Science in Audiology at the University of Hong Kong in May 2004 Apart from cortical evoked response audiometry (CERA), speech audiometry has also been used to identify non-organic hearing loss in English-speaking communities. The lack of a standardized speech test is one of the reasons why speech audiometry is not used for this purpose in Cantonese-speaking communities. The aim of the present study is to evaluate how well reception thresholds for sentences (RTS) measured by Cantonese materials and CERA thresholds relate to pure tone audiometric results. Pure tone audiometry was performed and results were used as the reference data in the present study. RTS were measured by CHINT in four conditions, quiet, noise front, noise right and noise left. CERA thresholds were measured at 0.5, 1, 2 and 4 kHz in both ears. Results of the present study suggested that RTS measured by CHINT had good correlations with pure tone audiometric results, and most participants had RTS in quiet within 10 dB A of pure tone averages, with the mean discrepancy values ranging from -6.45 to 1.44 dB A. The present study also suggested that CERA thresholds were highly correlated with pure tone thresholds, and most of the participants had CERA thresholds within 15 dB of pure tone thresholds, with the mean discrepancy values of 8.05, 9.25, 9.75 and 9.33 dB at 0.5, 1, 2 and 4 kHz respectively. As RTS measured by CHINT and CERA thresholds were correlated with pure tone vii audiometric results, and both tests yield thresholds within 10 dB to 15 dB of pure tone audiometric results for most participants, they are considered to provide a good estimate of hearing thresholds, and may be useful for identifying the presence of non-organic hearing loss. viii DOI: 10.5353/th_b3047671 Subjects: Audiometry, Evoked response - China - Hong Kong Hearing disorders - Diagnosis - China - Hong Kong