Hearing Loss Flashcards
conductive hearing loss
problem with sound travelling from environment to inner ear
sensorineural hearing loss
problem with sensory system or vestibulocochlear nerve
Eustachian tube
connects middle ear with throat
equilises pressure
semicircular canals
responsible for sensing head movement
cochlea
convert sound vibration into nervous signal
vestibulocochlear nerve
transmits signals from semicircular canals and cochlea to brain
Weber’s test: normal result
sound heard equally in both ears
Weber’s test: result indicating sensorineural loss
sound heard louder in normal ear
Weber’s test: result indicated conductive hearing loss
sound heard louder in affected ear
Rinne’s Positive result
AC > BC
normal result
Rinne’s Negative Result
BC > AC
suggests conductive hearing loss
causes of sensorineural hearing loss
sudden SN hearing loss presbycusis (age related) noise exposure Méinére's disease labrynthitis acoustic neuroma neuro conditions - stroke, MS, tumours infection - meningitis medications
causes of sensorineural hearing loss - medications
loop diuretics
aminoglycoside antibiotics - gentamicin
chemotherapy drugs
causes of conductive hearing loss
ear wax infection - otitis media, externa fluid in middle ear - effusion eustachian tube dysfunction perforated tympanic membrane otosclerosis cholesteatoma tumours
