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Conductive hearing loss in children
and adults
Definition
A hearing loss due to pathology
affecting the transmission of
sound from the environment to
the cochlea
Maximum loss of 50-60 dBHL,
therefore no more than
mild/moderate
Audiometric findings of low frequency conductive hearing
loss
Otoscopy and the normal tympanic membrane
CHL in children
Middle ear effusion (glue ear) incidence
aetiology
predisposing factors
clinical findings
treatment – surgical
medical
others
Glue ear presentations are variable
Grommets in treatment of glue ear
Other causes of CHL
Infections –
acute otitis externa
acute otitis media
Chronic suppurative otitis externa
Chronic suppurative otitis media
Cholesteatoma
Otosclerosis
Barotrauma
Trauma to the ossicular system and/or
tympanic membrane from changes of middle
ear/external canal pressure
Miscellaneous
• Congenital abnormalities – atresia
• Foreign bodies/wax
• Benign tumours of
outer/middle ear
• Trauma to ear
Treatment
Surgical
Medical
Others – hearing aids
Support services