CSD-4662 Lecture Notes - Lecture 1: Musical Tone, Conductive Hearing Loss, Audiometry
19 Jan 2019
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Pure tone audiometry, before audiometry, case history, otoscopy. Look into patient"s ear: example: occluding cerumen may need to be removed prior to testing, concept of threshold, pure tone threshold: lowest intensity level that a stimulus can be heard 50% of the time, measured in db hl. Instructions to patient: clear and explicit instructions are important and can affect the results, example: telling a patient to respond when he hears a sound vs when he thinks he hears a sound. If there is no response increase to 50 dbhl. If not heard at 50db, sound is increased by 10db until signal is heard: finding threshold, down 10, up 5. If there is no response, a downward arrow is added to the symbol: what can the audiogram tell us, degree (severity) of hearing loss. In conjunction with air conduction testing, bone conduction testing can tell us the type of hearing loss.
