3 - ENT - Otology - Ear testing and otoscopy - Testing hearing Flashcards Preview

CP2 > 3 - ENT - Otology - Ear testing and otoscopy - Testing hearing > Flashcards

Flashcards in 3 - ENT - Otology - Ear testing and otoscopy - Testing hearing Deck (19):
1

How to do Rinne's test

compare air conduction next to ears, with bone conduction (mastoid)

2

Rinne negative

bone conduction > air conduction - conductive deafness
(bone louder than air)

3

Rinne positive

air conduction > bone conduction - sensorineural deafness OR normal hearing
(air louder than bone)

4

how to do weber test

tuning fork on forehead/teeth/bone in midline - which side is louder or are they equal?

5

weber - conductive deafness?

sound better on affected side

6

weber - sensorineural deafness

sound better on other side

7

How to do pure tone audiogram

tone played through headphones and bone transducer, pt indicates when they can hear the tone

8

what is the normal dB range

0-20dB

9

what dB is characteristic of profound hearing loss

>90 dB

10

What are the dB ranges for the different hearing losses

20-40 = mild loss
40-55 = mod loss
55-70 = mod severe loss
70-90 = severe loss

11

what deafness is indicative of a clear gap between air and bone conduction, in pure tone audiometry

a conductive hearing loss

12

typical PTA for noise induced deafness

typical drop at 4-6kHz, increasing again at 8kHz

13

typical PTA for presbyacusis

drop at upper frequency end in both bone and air conduction

14

what is cahart's notch and what does it indicate

drop in BC at ~2kHz - due to otosclerosis, ossicular dysfunction

15

what is cookie bite loss - usual cause?

bite size chunk in middle of range - usually hereditary

16

Tympanometry - three types of graph and what they look like

type a - bell shaped
type b - flattened (high/low)
type c - peak shifted to left

17

Type A tympanogram - is this normal? what if shallow? what if deep?

normal

shallow - suggests less compliance - Hx of middle ear problems

deep - suggests increased compliance, Hx of perforations, grommets, or ossicular chain disruption

18

Type B tympanogram - is this normal? low vs high?

not normal
low - increased middle ear pressure eg OM
high - perforation (increased ear canal volume)

19

Type C tympanogram - is this normal? why?

not normal
negative middle ear pressure - eg eustachian tube dysfunction. sinus congestion

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