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Year 4 ENT > Audiology > Flashcards

Audiology Flashcards

1
Q

what is pure tone audiometry

A

non invasive hearing test that measures a persons ability to measure different sounds, pitches and frequencies

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2
Q

what is the hearing threshold

A

quietest sound that an individual can hear across a range of different frequencies

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3
Q

how are pure tones described

A

frequency, amplitude, phase and duration

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4
Q

how is pure tone amplitude quantified

A

decibels

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5
Q

Red is for right/left

A 
red = right
blue = left
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6
Q

what are the 3 transducers used to present tone

A

headphones
insert earphones
bone conductors

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7
Q

what does air conduction assess

A

whole hearing pathway

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8
Q

what does bone conduction assess

A

inner ear

bypasses external and middle ear

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9
Q

what are the different levels of hearing loss

A

mild
moderate
severe
profound

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10
Q

what is a normal reading

A

anything above 20

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11
Q

what is the symbol for right air conduction

A

red circle

right is never wrong

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12
Q

what is the symbol for left air conduction

A

blue cross

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13
Q

what is the symbol for unmasked bone conduction

A

black triangle

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14
Q

define threshold for mild hearing loss

A

20-40

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15
Q

define threshold for moderate hearing loss

A

41-70

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16
Q

define threshold for severe hearing loss

A

71-95

17
Q

define threshold for profound hearing loss

A

95+

18
Q

why is masking done in audiometry

A

it is not always certain that the intended test ear is the one detecting the sound. The better non-test ear may detect the signal easily.

19
Q

how is masking done

A

masking noise is introduced to the better ear to prevent it from picking up any pure tone

20
Q

how many rules of masking are there

A

3

21
Q

in general what are the rules of masking

A
  1. if there is a big difference between R + L ears
  2. unmasked BC is better than AC
  3. if rule one has not been applied
22
Q

BC can be above the AC threshold, true or false

A

FALSE

23
Q

features of CHL on audiogram

A

significant air bone gap present

BC within normal limits ie above 20 otherwise it is a MHL

24
Q

causes of CHL

A

ear infections
glue ear
perforated ear drum

25
Q

features of SNHL on audiogram

A

no significant air bone gap

26
Q

causes of SNHL

A 
presbyacusis 
loud sounds 
ototoxic drugs 
rubella infection 
birth complications 
benign tumours - NF2
Genetics
27
Q

features of MHL on audiogram

A

significant air bone gap at PARTS and patterns of SNHL

28
Q

causes of MHL

A 
genetics 
infections 
tumours 
trauma 
otosclerosis
29
Q

what is Cahart’s notch and in which condition is it seen

A

notch in the audiogram at 2KHz suggestive of otosclerosis

30
Q

what is tympanometry testing

A

measures pressure in middle ear, mobility of ear drum and conduction along ossicular chain

31
Q

tympanometry is a hearing test, true or false

A

FALSE

measure of energy transmission

Year 4 ENT (18 decks)

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