LING 2604 Lecture Notes - Lecture 12: Conductive Hearing Loss, Sensorineural Hearing Loss, Otitis Media
3 Dec 2015
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Document Summary
Adults: 10% of canadians report having a hearing loss; 20% over the age of 65 & 40% over age 75, most losses in adults are sensorineural but conductive losses may occur. Conductive hearing loss: middle ear dysfunction, outer ear dysfunction. Sensorineural hearing loss: damage to cochlear, damage to auditory nerve up to brain stem level (cn viii) Mixed hearing loss: damage in both areas, middle/outer ear and cochlear/cn viii. Conductive hearing loss is most common: otitis-media, eustachian tube dysfunction, adenoids/tonsils, infections of the throat, not usually permanent, responds to medical or surgical intervention, hearing loss is inconsistent. Sensorineural hearing loss: damage anywhere from cochlear & along 8th cranial nerve (auditory nerve, cannot fix them. Mixed hearing loss: both conduction & sensorineural components. Central auditory processing disorders: including central deafness. Conductive losses: cerumen (ear wax, otosclerosis. Genetic disease which tends to affect women more often than men. Ossicles aren"t moving properly due to abnormal bone growth around.
