Deafness - main types of deafness-• Conductive – arises...

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Deafness *Deafness is a condition wherein the ability to detect certain frequencies of sound is completely or partially impaired. When applied to humans, the term “hearing impaired” is rejected by the Deaf Culture movement, where the terms deaf and hard-of-hearing are preferred. Symptoms The principle symptom of deafness and hearing loss is in the inability to hear sounds. From the age of 20, slow degenerative hearing loss occurs in most people. In this type of hearing loss the range of frequencies that we hear is restricted. The normal range experienced in childhood is considered to be between 20 Hz and 20,000 Hz. In young children signs of hearing loss may include a quiet baby who fails to meet certain developmental milestones, such as responding to sounds (6 months) and limited two word speech (1 year). Causes Adults: Deafness, which may be congenital or acquired, is a partial or total loss of hearing in one or both ears; it results from disorders of any part of the either our hearing apparatus or neural processing. There are two
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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.

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Deafness - main types of deafness-• Conductive – arises...

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