Week 3: Speech Audiometry, Tympanometry and Ear Canal Volume

Question 1

What does SRT stand for?

Answer 1

Speech Recognition Threshold or Speech Reception Threshold

Question 2

Define SRT

Answer 2

minimum hearing level (softest intensity) in decibels (db HL) at which an individual can identify and repeat words (two-syllables) correctly

Question 3

In terms of SRT, two syllables are pronounced with?

Answer 3

Equal stress

Question 4

SRT is related with?

Answer 4

PTA

Question 5

What does PTA stand for?

Answer 5

Pure-Tone Average

Question 6

How do you calculate PTA?

Answer 6

the average of AC thresholds obtained at 500, 1000, and 2000 Hz in a pure-tone audiometry test

Question 7

The difference between SRT and PTA is no more than 6 dB, the accordance/agreement is said to be?

Answer 7

GOOD

Question 8

The difference b/w SRT and PTA is within 7 to 12 dB, the accordance/agreement is said to be?

Answer 8

FAIR

Question 9

The difference b/w SRT and PTA is 13 dB (or more), the accordance/agreement is said to be?

Answer 9

POOR

Question 10

What does WRS stand for?

Answer 10

Word Recognition Score

Question 11

Define WRS

Answer 11

the percentage of correctly identified, and repeated words (single-syllable/monosyllabic words) from phonetically balanced word list at the comfortable listening level

Question 12

WRS can be used to?

Answer 12

aid in the diagnosis of the site (location) of the disease/disorder (cochlea vs cochlear nerve)

Question 13

What is tympanometry?

Answer 13

a test used to detect disorders/diseases of the tympanic membrane and middle ear

Question 14

The word tympanometry is compounded from the Greek word tympanon, what does the word mean?

Answer 14

tympanic membrane and metrein (meaning to measure)

Question 15

What is typanometer?

Answer 15

An air pump (which creates either +/- air pressure within the external ear canal)
A pure tone generator 
A microphone (which picks up the reflected waves as its turns from the tympanic membrane)

Question 16

daPa is the measurement for?

Answer 16

pressure (middle ear pressure)

Question 17

ml is the measurement for?

Answer 17

compliance (tympanic membrane mobility)

Question 18

Describe the pressure and compliance of the Type A Tympanogram

Answer 18

Normal pressure: +50 to -100 daPa

Normal compliance: 0.3 ml to 1.6 ml

Question 19

Type A Tympanogram is seen in patients who have?

Answer 19

Normal middle ear pressure and tympanic membrane mobility

Question 20

Describe the pressure and compliance of the Type As Tympanogram

Answer 20

Normal pressure: +50 to -100 daPa

Low (decreased) compliance: less than 0.3 ml

Question 21

Type As Tympanogram is seen in patients who have?

Answer 21

Otosclerosis (the stapes has become partially or completely fixed/immobilized, and so the ossicular chain)

Question 22

Describe the pressure and compliance of the Type Ad Tympanogram

Answer 22

Normal pressure: +50 to -100 daPa

High (increased) compliance: more than 1.6 ml

Question 23

Type Ad Tympanogram is seen in patients who have?

Answer 23

Atrophic Tympanic Membrane (a very thin and flaccid tympanic membrane)
Ossicular Chain Discontinuity (the separation of the joint connecting two middle ear bones)

Question 24

Describe the pressure and compliance of the Type C Tympanogram

Answer 24

Negative pressure: significant negative middle ear pressure, more negative than -100 daPa
Normal compliance: 0.3 to 1.6 ml

Question 25

Type C Tympanogram is seen in patients who have?

Answer 25

Eustachian Tube Disfunction

Question 26

Describe the pressure and compliance of the Type B Tympanogram

Answer 26

Flat (with no discernible peak of pressure)

Question 27

Type B Tympanogram is seen in patients who have?

Answer 27

Otitis Media with Effusion (fluid within the tympanic cavity) Tympanic Membrane Perforation Typanosotomy Tube (middle ear ventilation tube) Impacted Earwax (earwax that blocks the external ear canal) Atelectasis (tympanic membrane pushed towards/sucked inside the tympanic cavity)

Question 28

What does ECV stand for?

Answer 28

Ear Canal Volume

Question 29

Define ECV

Answer 29

an estimate (of air) medial to probe

Question 30

What does ECV include?

Answer 30

the volume between the probe too and the tympanic membrane the volume of the external ear canal and the middle ear space Normal values in adults (0.7 to 2.0 cm3)

Question 31

What does normal ECV mean?

Answer 31

when the volume is between the probe tip and the tympanic membrane (when the tympanic men is intact)

Question 32

What does large ECV mean?

Answer 32

when the volume is between the external ear canal and the middle ear space (when the tympanic membrane is perforated or there is a tympanostomy tube)

Question 33

What does small ECV means?

Answer 33

when the volume is between the probe tip and the impacted earwax

Question 34

Describes Otitis Media with Effusion

Answer 34

fluid within the tympanic cavity (serous otitis media, mucous otitis media)

Question 35

What are the ECV and tympanogram types of Otitis Media with Effusion?

Answer 35

ECV: normal Tympanogram: Type B

Question 36

Describe Tympanic Membrane Perforation

Answer 36

perforation in the tympanic membrane (holes)

Question 37

What are the ECV and tympanogram types of Tympanic Membrane Perforation?

Answer 37

ECV: large Tympanogram: Type B

Question 38

Describes Typanostomy Tube

Answer 38

it provides ventilation of the middle ear tympanic cavity by allowing the free passage of air through the tympanic membrane

Question 39

What are the ECV and tympanogram types of Tympanostomy Tube?

Answer 39

ECV: large Tympanogram: Type B

Question 40

Describes Impacted Earwax?

Answer 40

Earwax that blocks the external ear canal

Question 41

What are the ECV and tympanogram types of Impacted Earwax?

Answer 41

ECV: small Tympanogram: Type B

Question 42

What is the relationship between tympanometry and ear canal volume?

Answer 42

They are objectives test that does not require behavioral responses from patients Both tests are very useful in the diagnosis of the tympanic membrane and middle ear diseases