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This dissertation, Hearing Loss in School Children With Down Syndrome by Kwong-ki, Leung, 梁廣基, 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 Hearing loss in school children with Down syndrome submitted by LEUNG Kwong Ki for the degree of Master of Science in Audiology at the University of Hong Kong in May 2006 There is well-documented evidence in the literature concerning a high prevalence of deafness in children with Down Syndrome (DS). The present aim of this study is to examine the extent of hearing loss and address the rehabilitation needs of a local population with DS either in special schools or integrated in mainstream schools. A comparison with previous studies of school populations with DS will be made. This study screened 92 children with DS at their own schools and 11 of them were reassessed in the Hearing Centre of Prince Philip Dental Hospital / University of Hong Kong from December 2004 to February 2005. Hearing status of the children with DS was analyzed on the basis of the screening and reassessment results of their tympanometric, transient evoked otoacoustic emission (TEOAE) and pure tone audiometric examinations. A crosscheck method concluded the results were similar. The results indicated that there was a high point prevalence of hearing impairment (78% by ears or 90% by subjects) in a local DS sample. The most frequent degree of the loss was mild to moderate. No significant gender difference, age effect and ear asymmetry were found vin failed tympanometry and absent TEOAE. The low signal-to-noise ratio in a local school environment further reduced the already unfavorable sample speech intelligibility index score (0.2). Sound field amplification and suitable acoustic modifications to classrooms were found beneficial for the children to listen and learn. However, it is inconclusive to deduce the most frequent type and cause of hearing loss. The point prevalence of hearing loss of older children with DS in this study was in contrast with a local study comprising of younger ones that showed a much lower rate of hearing problems. To determine the role of possible aging effect in the type and prevalence of hearing loss in DS subjects, further effort is needed. vi DOI: 10.5353/th_b3798679 Subjects: Down syndrome - Patients - China - Hong KongHearing disorders in children - China - Hong Kong

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