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Unformatted text preview: main types of deafness:-• Conductive – arises from a defect in the transmission of sound waves from the outer ear to the inner ear, causes include:-o Obstructions Wax Inflammation of the ear canal Accumulation of discharge (from otitis externa) Effusion’s in the middle ear (glue ear) o Perforation of the eardrum Trauma Infective damage Pressure changes o Disorders of ossicles Osteogenesis imperfecta Osteosclerosis • Sensorineural – arises from damage to the structures of the inner ear or neurone which transmit information from the ear, it may take one of three patterns:-o Bilateral and progressive Usually due to age related degeneration (Presbycusis) o Unilateral and progressive Acoustic neuroma Meniere’s disease Syphilis o Sudden Drugs Antimalarials (Quinine, Malarone) Antibiotics (Gentamicin) Chemotherapeutics (Cisplatin) Sudden exposure to loud noises...
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This note was uploaded on 12/04/2011 for the course ANT ANT2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.
- Fall '10