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Audiometry > Test 2 > Flashcards

Test 2 Flashcards

1
Q

If PTA and SRT are not within +/- 10 db you can suspect problems with…

A

Test procedure
test equipment and calibration
functional hearing loss

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2
Q

What is the purpose of speech reception threshold?

A

to validate puretone thresholds at 500, 1000, and 2000hz (PTA)
baseline for speech discrimination test
hearing aid evaluation for gain prescription

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3
Q

What is the starting intensity level for speech reception thershold? and what is the presentation mode?

A

30db above the puretone average for each ear
Then go down 10db (until NR) and up 5 db
Presentation mode - live voice

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6
Q

What is the purpose of Speech Discrimination testing?

A

determine extend of SD ability
determine site of ear pathology
determine candidacy for hearing aid amplification
determine prognosis for Aural rehabilitation

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7
Q

What is the SD testing procedure?

A

Initial Intensity Level - 30 db above SRT in each ear
Number of words - 25
Open word lists - CID W-22 or NU-6 (Adu), PB-K
SD% = # correct x 4

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8
Q

0-59%: Very poor

A

Sensori-neural (Neural/8th nerve)

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9
Q

Conventional SD testing extensions

A

SD at higher intensities
SD in noise (ex. SPIN test) speech perception in noise
SD using synthetic sentences (ex. SSI test) Synthetic sentence identification test
SD using high-frequency stimuli (ex. CCT) California Consonant Test

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10
Q

What is the function of PI-PB?

A

measuring performance (SD) at different intensity levels using PB words (CID W-22 or NU-6)

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11
Q

90-100%: Excellent

A

Normal/Conductive hearing loss

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12
Q

What are the intensities normally used for PI-PB?

A

30 db above SRT (30db SL)
45 db above SRT (45db SL)
60 db above SRT (60db SL)

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13
Q

For conductive and cochlear hearing loss, PI-PB performance gets _____ as intensity increases?

A

better

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14
Q

What is the speech material used in speech reception threshold?

A

CID W-1 (two syllabic words/spondees with equal stress)

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16
Q

What does sensation level (SL) mean?

A

level of sound above threshold

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17
Q

What is speech reception threshold?

A

the lowest level an individual can identify spondees 50% of the time (2/4, 3/4) or three repeated responses

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17
Q

In ROR, what figure is consistent with neural lesion?

A

0.4 or greater

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18
Q

In ROR, what figure is consistent with normal or conductive hearing loss or cochlear lesion?

A

0.4 or less

18
Q

What is the purpose of Immittance audiometry?

A

to directly evaluate the middle ear status

to indirectly evaluate the inner ear status

18
Q

What is happening in the Probe ear (test ear) during Immittance audiometry?

A

probe tone frequency: 220 Hz or 660Hz (which must be done with new born babies to get reliable tympanograms)
Probe tone intensity: 85 db spl in the ear canal

18
Q

Type B

A

Abnormally low compliance
peak compliance - absent
consistent with middle ear fluid build-up

21
Q

Type As

A

Limited peak compliance around 0 to -100 mm air pressure; less than 0.3 ml
consistent with otosclerosis - stapedial bone fixation - fixed to the oval window

22
Q

What tests are used in Immittance audiometry to directly assess the middle ear?

A

Tympanometry

stapedial reflex threshold

24
Q

Type C

A

Normal peak compliance beyond -100 mm air pressure

consistent with Eustachian tube malfunction (plugged up)

25
Q

What are the advantages of Immittance audiometry?

A

The tests are objective so they are replicable and require less patient cooperation
determine the cause for conductive hearing loss
determine functional integrity of the inner ear - indirectly

26
Q

How do you determine PI-PB roller over ratio?

A

PBmax - PBmin / PBmaz = ROR%

27
Q

What are the classifications of Tympanograms?

A 
Normal - Type A
Abnormal 
Type As - stiffness  
Type Ad - flaccidity 
Type B - Fluid 
Type C - Eustachian tube malfunction
28
Q

What is a typanogram?

A

A graphical plot showing eardrum compliance at different values of air pressure (-200 to 200)

29
Q

Type A

A

normal peak compliance around 0 to -100 mm air pressure

30
Q

What are the normative values (absolute) for tympanograms?

A

Ear Canal volume - 0.2 to 2.0 ml
Peak compliance - 0.3 to 1.8 ml (perforated ear drum = flatline)
middle ear pressure - 0 to 50, 0 to -100

31
Q

60-89%: Moderate to Fair

A

Sensori-neural (Cochlear)

32
Q

Ad

A

Abnormally high compliance around 0 to -100 mm air pressure; greater than 1.8ml
Consistent with eardrum flaccidity with ossicular disarticulation

33
Q

What tests are used in Immittance audiometry to indirectly evaluate the inner ear status?

A

stapedial reflex threshold

stapedial reflex decay

35
Q

What is the function of the probe ear in immittance audiometry?

A

ear with the earphone

placed to present sounds to elicit contralateral stapedial reflex

Audiometry (2 decks)

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