Download The Medical Practitioner's Guide to Paediatric Audiology by Barry McCormick PDF

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By Barry McCormick

This e-book offers a convenient reference advisor for practitioners who do not need professional wisdom in pediatric audiology yet who, however, will stumble upon many instances with gentle listening to impairment in formative years and coffee situations with extra serious listening to difficulties. The try tactics used to evaluate the presence, kind, nature and measure of listening to impairment are defined with suggestions on how one can interpret the data supplied in audiological experiences.

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Extra info for The Medical Practitioner's Guide to Paediatric Audiology

Example text

9 then this would be a very different (and in children a much more common) situation. In this case the bone-conduction thresholds tell us that the hearing in the better cochlea is normal irre0 0 10 10 k 20 30 40 20 30 y^ 50 jr \ 40 ) " 60 50 — 60 70 I 70 80 W) 8 0 i 90 100 X 100 110 110 120 120 yi? *Plili# iiiiil lilllli•iipll iliii lilllli IllliS iliiifiiltlit 250 500 1000 2000 Frequency (Hz) •ill III 4000 130 --. 7. Air-conduction audiogram obtained without masking. 42 5. Wood -10 0 10 20 \ 30 40 \ 1 * 50 — 60 > ju 70 g> 80 rt 90 3C 100 110 120 120 130 i •• 1000 130 • 2000 4000 8000 I.

The correlation was found to be high with a 95% confidence interval of 11 dB. This version of the Toy Discrimination Test is not and cannot be fully automated. The tester still needs experience and skill in handling young children and controlling their attention, so that reliable and accurate results are obtained. Summary Children of all ages can undergo audiological assessment using behavioural methods. The choice of test technique depends on the developmental age of the child, not the chronological age.

Masking In order to overcome the problems of cross-hearing a technique known as masking is used. This involves presenting a noise (usually a narrow band noise centred on the test frequency) to the non-test ear in order to 'occupy' it whilst at the same time remeasuring the threshold in the test ear. It will be obvious that there is then a possibility that the masking noise may in turn cross over and affect the threshold in the test ear. This is known as cross-masking. It is necessary to ensure that the correct level of masking is used; too little masking will not prevent the nontest ear from responding to the threshold measurement; too much masking will cross over and artificially raise the threshold in the test ear.

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