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Definition
A hearing loss due to pathology affecting the transmission of sound from the environment to the cochleaMaximum loss of 50-60 dBHL, therefore no more than mild/moderate
CHL in children
Middle ear effusion (glue ear)incidence
aetiologypredisposing factorsclinical findingstreatment – surgical
medicalothers
Trauma to the ossicular system and/or tympanic membrane from changes of middle ear/external canal pressure
Barotrauma
Miscellaneous• Congenital abnormalities – atresia• Foreign bodies/wax• Benign tumours of
outer/middle ear• Trauma to ear