Acoustics Immittance Measures I

Question 1

What is the difference between impedance and admittance?

Question 2

What is resistance?

Question 3

What is mass reactance (positive)?

Question 4

What is compliance reactance (negative)?

Question 5

Xm + X

Question 6

R

Question 7

Xc - X

Question 8

G

Question 9

Bm (-B)

Question 10

Bm (+B)

Question 11

What is conductance?

Question 12

What is mass susceptance (negative)?

Question 13

What is compliance susceptance (positive)?

Question 14

What are the immittance components of the ear?

Question 15

What is immittance used for?

Question 16

What do you need to measure tympanometry?

Question 17

What does single frequency tympanometry do?

Question 18

What does the microphone measure?

Question 19

What effect does the cavity volume have on results?

Question 20

How does the probe tone frequency affect middle ear impedance?

Question 21

What are the effects of pressure in the outer ear?

Question 22

What are the effects of middle ear pressure?

Question 23

What are the effects of TM and ossicular resistance?

Question 24

What are the compensated static admittance norms?

Question 25

What are the four types of tympanograms?

Answer 25

Type A - normal peak
Type B - flat
Type C - negative
Type Ad - hypermobile
Type As - hypomobile

Question 26

Describe the equivalent ear canal volume

Question 27

What is the tympanometric width and how do you calculate it?

Question 28

What is the tympanometric gradient and how do you calculate it?

Question 29

What are the effects of TM perforation or PE tubes?

Question 30

How do you perform tympanometry on infants?

Question 31

What does a tympanogram graph depict?

Question 32

Describe a Type A tympanogram

Answer 32

Static admittance WNL
Peak pressure WNL

Question 33

Middle ear admittance is indicated by the tympanometric ___________________________

Answer 33

static admittance

Question 34

Middle ear pressure is indicated by the tympanometric ______________________________

Answer 34

peak pressure

Question 35

Describe a Type C tympanogram

Answer 35

Static admittance WNL
Peak pressure negative

Question 36

Describe a Type Ad tympanogram

Answer 36

Static admittance very high
Peak pressure WNL

Question 37

Describe a Type As tympanogram

Answer 37

Static admittance very low
Peak pressure WNL

Question 38

Describe a Type B with large ECV tympanogram

Answer 38

No pea, from perforated TM

Question 39

Describe a Type B with normal ECV tympanogram

Answer 39

No peak, from OME

Question 40

T/F: admittance is the greatest when there is no hearing loss

Answer 40

False

Question 40

T/F: admittance is greatest when the middle ear pressure is equal to the canal pressure

Answer 40

True

Question 40

Middle ear fluid is indicated by _____________________.

Answer 40

Increased tympanometric width

Question 40

T/F: Admittance is low when the dB SPL measured at the probe microphone is low

Answer 40

True

Question 41

For tympanometry, the probe tip must be ____________________

Answer 41

inserted with an airtight seal

Question 41

Eustachian tube dysfunction is indicated by ____________________

Answer 41

Negative peak pressure

Question 42

Equivalent ear canal volume is inferred by the admittance measured while the pressure is at _____________ daPa.

Answer 42

+200