Change in hearing
Jump to navigation Jump to search
A change in hearing, admittedly usually hearing loss.
Basically, it's either:
- Conductive deafness is where there is an abnormality between the sound getting to the outer ear and the nerves to the brain.
- Sensorineural deafness is where there is a problem with the nerves from the cochlea to the brain.
- Wax - very common.
- Otitis media - middle ear infection. Very common. Causes ear pain.
- "Glue ear" - fluid in the middle ear. Usually due too an effusion from otitis media.
- URTI - often the Eustachian tube gets blocked leading to difficulties in equalising the pressures either side of the ear drum.
- Foreign body, trauma, perforated ear drum and head injury can all lead to problems in hearing
- Oldness - aka as age-related hearing loss or presbyacusis. People get old and hair cells in the cochlea get damaged. Thus, their hearing becomes less good.
- Infections - measles, mumps or meningitis
- Meniere's disease - fluid gets stuck in the ear, escaping from the endolymph system in the ear. No, I don't really know what an endolymph is either.
- Medications - aminoglycosides (particularly gentamicin and tobramycin), chemo and radiotherapy can all cause deafness. Aspirin can cause tinnitus.
- Aural tumours - rare. Acoustic neuroma and choleastoma.
Clinical and Associated Features
|Weber||Loudest in affected ear. Blockage masks ambient sounds||Loudest in unaffected ear. Conduction is fine therefore the affected ear is just not working as well|
|Rinne||Bone conduction > Air conduction. The air canal is screwed so sound conducts better down the bone on the affected ear.||Air conduction > bone conduction. No problems with conducting sound and bone isn't as good as the air|