Left side sensorineural deafness
Left sided conductive deafness
Right sided conductive deafness
Right sided sensorineural deafness
The given audiogram depicting a mild rising conductive hearing loss in the left ear.
– Blue color indicates left ear.
– indicates BC and threshold is <25dB. BC is normal which means sensorineural pathway is normal.
– × indicates AC and threshold is >15 dB and hence AC is abnormal.
– So it indicates conductive deafness.
– Conductive hearing loss has normal bone-conduction thresholds, but air-conduction thresholds are poorer than normal by at least 10 dB.
– Conductive hearing loss is secondary to an outer ear or middle ear abnormality, which can include abnormalities of the tympanic membrane. The abnormality reduces the effective intensity of the air-conducted signal reaching the cochlea, but it does not affect the bone-conducted signal that does not pass through the outer or middle ear.
-Examples of abnormalities include occlusion of the external auditory canal by cerumen or a mass, middle ear infection and/or fluid, perforation of the tympanic membrane, or ossicular abnormalities.
-Pure-tone air-conduction thresholds are poorer than bone-conduction thresholds by more than 10 dB