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Types of Hearing Loss

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by

Brian Martin

on 1 July 2013

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Transcript of Types of Hearing Loss

Outer Ear
Middle Ear
Inner Ear
Types of Hearing Loss
Peripheral hearing loss is hearing loss as a result of a malfunctioning outer ear, middle ear and/or inner ear structure. The type of peripheral hearing loss depends upon which area is affected. There are three types
of peripheral hearing loss...
Conductive Hearing Loss
And Their Associated Disorders
Associated with the outer or middle ear
Inner ear undamaged
Loudness reduced
May not be permanent
Bones of middle ear can be damaged, but there will be bone conduction from skull allowing for some hearing
Individuals often speak softly due to
air-bone gap
: the difference between air and bone with regards to sound conduction (i.e. environmental sounds are muffled but their can hear their own speech)
Much like the sensation of covering your ears, or wearing ear plugs
Try This!!!!!!
Conductive Hearing Loss: Disorders of the Outer Ear
Conductive Hearing Loss: Disorders of the Middle Ear
Sensorineural Hearing Loss: Disorders of the Inner Ear
Microtia: pinna misshapen and/or small
Congenital Atresia: no external canal
Sensorineural Hearing Loss
Cholesteatoma: mass of epithelial cells that damage ossicles
Otosclerosis: genetic disorder involving the hardening of the stapes footplate
Otis Media: inflammation of the middle ear cavity mucosa lining
Characterized by damage to the inner ear (most commonly of the cochlear hair cells)
Outer and middle ear undamaged
May be: acquired or genetic- from birth or gradual onset
Likely permanent
Hearing damage ranges from mild - profound
Relates to loss of certain frequencies (often higher frequency issues, lower frequency may be unaffected)
And This!!!
Can you tell the difference between conductive and sensorineural hearing loss? Conductive is caused by obstruction in the middle and outer ear resulting in lower volume. Sensorineural, in most cases, is associated with damage to cochlear hair cells. These hair cells are organized by frequency, and so hearing loss is often frequency oriented.
Review
Mixed Hearing Loss

Aplasia/dysplasia- absence/malformation of inner ear structures during embryonic development
Usher's syndrome- genetic disorder associated with night blindness
Meineres disease- resulting from fluid buildup
Maternal rubella- affects child in womb as result of rubella virus
Acousitc neuroma- tumor on the auditory nerve
Combination of both sensorineural and conductive hearing loss.
(Central) Auditory Processing Disorders
associated with central auditory system
more issues regarding interpretation of auditory stimuli (e.g. determining location of sounds)
less about clarity of hearing
often, background noise can worsen symptoms
Common Causes of Conductive Hearing Loss
•Fluid in the middle ear from colds
•Ear infection (otitis media)
•Allergies (serous otitis media)
•Poor eustachian tube function
•Perforated eardrum
•Benign tumors
•Impacted earwax (cerumen)
•Infection in the ear canal (external otitis)
•Swimmer's Ear (otitis ecxterna)
•Presence of a foreign body
•Absence or malformation of the outer ear, ear canal, or middle ear


ASHA. (n.d.). Conductive hearing loss. Retrieved from http://www.asha.org/public/hearing/Conductive-Hearing-Loss/

Common Causes of Sensorineural Hearing Loss
•Illnesses
•Drugs that are toxic to hearing
•Hearing loss that runs in the family (genetic or hereditary)
•Aging
•Head trauma
•Malformation of the inner ear
•Exposure to loud noise






ASHA. (n.d.). Sensorineural hearing loss. Retrieved from http://www.asha.org/public/hearing/Sensorineural-Hearing-Loss/

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