Assessment Of Adult Hearing Flashcards
What is cross hearing
-sound presented by headphones can cross from on ear to the opposite ear. This happens through the skull
What is pure tone audiometry test
Behavioural test used to measure the threshold of hearing to pure tones of different frequencies
Each ear is tested separately
This test is standardised
What is a otoscopy
Looking down ears
What is sound
-the vibration of air molecules
-objective measurement of sound tells us the pressure
-
What is the measument of pressure
Newtons/ m2 = pascal
What is the range of human hearing
20 micro pascals to 200 pascals
Use a logarithmic scale to keep it manageable
Therefore the scale is decibel (db)
What is the dB HL scale
-audiometry uses dB HL ‘hearing level’
-normalises average threshold values across the frequency range
-found by testing normal hearing adults
-0=threshold
What is the threshod in pure tone audiology
The lowest level of sound the subject can hear 2/2 or 3/4 responses on ascending level
What are the 3 times of hearing loss
-SNHL sensory neural hearing loss
-conductive hearing loss
-mixed
What is SNHL
Sensory neural hearing loss
-problem with cochlear, cochlear nerve, brain related to hearing, auditory nerve or tumour
Conductive hearing loss (airbone gap)
-problem with outer or middle ear
-lower levels of sounds will get into the ear
-perhaps hole in membrane or there is a bony growth
-=stopping sounds getting into cochlear
What is air conduction test
-headphone placed over pinna
-presents sound to the membrane and into the cochlear
-tests the full auditory pathway
What is bone conduction test
-goes behind the back of the persons ear on the auditory meatus
-vibrates the skull
-bipases the outer and middle ear
-sound goes straight to the cochlear
Hearing test results
What does the triangle mean
Bone conduction threshold
Hearing test results
What does the circle symbol mean
Air conduction threshold
Hearing test results
What does 0 mean
Normal/ mean average hearing