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11 Cards in this Set
- Front
- Back
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What is normal hearing? |
<25dB |
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What is the mechanism of conductive hearing loss? |
Occurs when auditory stimuli are not adequately transmitted through the auditory canal, tympanic membrane, middle ear or ossicle chain to the inner ear |
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What are some causes of conductive hearing loss? |
Temporary: cerumen or foreign bodies in the outer ear, fluid in middle ear Permanent: thickening or damage of tympanic membrane, involvement of bony structures of the middle ear caused by Paget's disease or otosclerosis |
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How much hearing loss occurs in conductive hearing loss? |
20-60dB maximum |
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What is the mechanism of sensorineural hearing loss? |
Sound waves are conducted to the inner ear, but abnormalities of the cochlear apparatus or auditory nerve decrease or distort transfer of information to the brain. **Abnormal function or malformation of central auditory pathways and circuitry are not included** |
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What are some causes of sensorineural hearing loss?
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Disorders affecting the inner ear or auditory nerve |
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How much hearing is lost in sensorineural deafness? |
Profound i.e. >90dB |
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What is the Rinne's test? |
Tuning fork is placed on the mastoid bone (bone conduction) then next to the external ear (air conduction) Air conduction should be heard louder than bone conduction - this is a positive test. **positive test seen in sensorineural deafness |
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What would a negative Rinne's test show? |
Same-sided conductive deafness |
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What is Weber's test? |
Tuning fork is placed on the forehead, and the patient is asked in which ear the sound is louder. If the sound is heard equally, or the patient cannot localise it, this is normal and is a "mid-line Weber's test" |
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In what way does Weber's test lateralise? |
Weber's test lateralises towards a conductive hearing loss and away from a sensorineural hearing loss i.e. if heard louder on RHS: ***right conductive hearing loss OR ***left sensorineural hearing loss |
