Audiology

Question 1

principles of audiometry?

Answer 1

finds hearing threshold (quietest sound patient can hear at various frequencies)
if patient responds to sound 50% of time then thats probably their threshold

Question 2

frequency range in audiometry?

Answer 2

air conduction 125-8000Hz

bone 250-6000Hz

Question 3

decibel range?

Answer 3

up to 120Db in air (50Db less in bone)

Question 4

type of sounds in audiometry?

Answer 4

pure tones
simple, single frequency sound
(warble tones played in children and people with tinnitus or learning difficulties)

Question 5

3 main transducers in audiometry?

Answer 5

headphones
insert earphones
bone conductor

Question 6

air vs bone conduction threshold assessment/

Answer 6

air = assessed using headphones or insert earphones, assesses entire auditory pathway
bone = assessed using bone conductor, bypasses external and middle ear, stimulates inner ear (can tell you about cochlea)

Question 7

not hearing tone quieter than what Db is classed as hearing loss at any frequency?

Answer 7

20Db

Question 8

audiogram symbols?

Answer 8

right ear = red
left ear = blue
air right = circle
air left = cross
bone = triangle

Question 9

masked audiogram symbols?

Answer 9

air conduction: masked and threshold changed = fully filled in, masked but threshold the same = half filled in
bone conduction: bracket

Question 10

classes of hearing loss by average hearing thesholds?

Answer 10

mild: threshold = 20-40Db
mod: 41-70
severe: 71-95
profound: 95+

Question 11

why is masking used?

Answer 11

to make sure its only the ear youre testing thats picking up the sound (the sound can travel and be picked up by the other ear)
e.g when testing a bad ear, the sound could be picked up by the good ear on the other ear and the patient responds saying they can hear it so its recorded that they can hear that sound fine in the bad ear when they cant