Types of Hearing Loss
Aug 23, 2014
Types of Hearing Loss
Conductive Hearing Loss
Happens when sound wave can't reach internal ear
Something stops sound getting into ear
Affected outer or middle Ear
Outer Ear - Causes
A. Blocked ear canal– Wax & Infection
B. Scarred eardrum– Often caused by glue ear
C. Perforated eardrum
Middle Ear - Causes
• Broken Ossicles - Hammer, anvil, stirrup
• Glue ear - Infection with build up of sticky fluid which prevents Ossicles from vibrating properly
Middle Ear - Causes
Eustachian tube not opening and closing properly
– Cold or catarrh– Allergic reaction
Sensori-neural Hearing Loss
Affected inner ear auditory nerve80% of people with a hearing loss have SNHL
Occurs either the hair cells in the cochlea or the nerve to the brain
are damaged
Sound is not been passed onto the auditory centre in the brain
Very rare that the exact cause can be identified
The Inner Ear
Cochlea
Auditory nerve
Inner Ear - Causes• Commonest cause – old age
deafness (presbyacusis)
• Noise damage• Chemotherapy / radiotherapy –
sometimes
• Virus or infection
• High doses of some medications
Inner Ear - Causes
• Acoustic neuroma
• Autoimmune Inner Ear Disease
• Accident – head injury
• Congenital
• Meniere’s Disease
Central Auditory Processing Disorder (CAPD)
Caused by a difficulty in the hearing part of the Brain
A sort of hearing dyslexia
Can be helped by lipreading as ability to process words is not affected
Occurs when sound reaches brain but there is a difficulty in identifying
sound patterns
Central Auditory Processing Disorder (CAPD)
Caused by a difficulty in the hearing part of the Brain
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