CH. 8 - Immittance Audiometry

Question 1

what is this?

Answer 1

immittance meter

Question 2

general term encompassing impedance and admittance

Answer 2

Immittance

Question 3

ease with which energy can flow in a vibratory system

Answer 3

Admittance

Question 4

extent which system resists flow of energy through it

Answer 4

Impedance

Question 5

Immittance meant to represent both ___ and ____

Answer 5

admittance; impedance

Question 6

way of assessing manner in which energy flows through outer and middle ears to cochlea

Answer 6

Immittance audiometry

Question 7

what triggers the acoustic reflex?

Answer 7

when a sound has sufficient intensity

Question 8

Most common reason for abnormality of acoustic reflex is ___

Answer 8

middle ear disorder

Question 9

what are three primary functions of immittance audiometry in relation to evals?

Answer 9

MCCC

1. Useful for detecting middle ear disorders
2. Differentiating cochlear and retrocochlear
3. Cross-check to pure tone

Question 10

When using an immittance meter, you’ll use ___ Hz, unless you’re working with infants or newborns. Then you’ll use ___ Hz

Answer 10

226; 1K

Question 11

What is the standard dB of immittance test?

Answer 11

85 dB

Question 12

How does air pressure relate to immittance tests

Answer 12

Best when pressure is equal on both sides

Question 13

What does a tympanometry test measure?

Answer 13

how acoustic immittance of middle ear changes as air pressure varied in external ear canal

Question 14

Four values that determine tympanogram type

Answer 14

TEST

-Static acoustic admittance
-Tympanometric width
-Equiv ear canal volume
-Tymp peak pressure

Question 15

what does ECV stand for?

Answer 15

Ear canal volume

Question 16

what does ear canal volume measure?

Answer 16

Estimate of volume of ear canal from tip of probe to TM

Question 17

what is a normal ECV value?

Answer 17

0.5-1.5 cc

Question 18

Graphing of tympanogram is called a ___

Answer 18

tracing

Question 19

Type A tympanogram peaks at 0 daPa in an ideal case, but can also be considered type A if it peaks from ___ - ___ daPa

Answer 19

-100; 100

Question 20

what type of tymp is this?

Answer 20

A

Question 21

what type of tymp is this?

Answer 21

B

Question 22

what type of tymp is this?

Answer 22

type C

Question 23

what type of tymp is this?

Answer 23

aS

Question 24

what type of tymp is this?

Answer 24

aD

Question 25

a type A tymp indicates

Answer 25

normal middle ear function

Question 26

a type B tymp indicates one of these two

Answer 26

1) mass added to ossicular chain, often from fluid 2) perforation in tympanic membrane

Question 27

if someone has PE tubes in their ear, their tymp type should be __, ECV should be

Answer 27

B; large

Question 28

why does type C happen?

Answer 28

Eustachian tube dysfunction, creates vacuum

Question 29

in type aS tymp, what does the "s" stand for?

Answer 29

shallow

Question 30

in type aD tymp, what does "d" stand for?

Answer 30

deep

Question 31

On a tympanogram, the X value is ___ and the Y value is ___

Answer 31

TPP; SA

Question 32

what does TPP stand for

Answer 32

tympanic peak pressure

Question 33

what does SA stand for?

Answer 33

static admittance

Question 34

what is TTP an estimate for?

Answer 34

air pressure in middle ear

Question 35

when a sufficient intensity of sound is delivered to the right ear, the acoustic reflex should activate in the ___ ear

Answer 35

both

Question 36

acoustic reflex tests can be _____ (same side) or ____ (opposite side)

Answer 36

ipsilateral; contralateral

Question 37

most of the time, abnormal acoustic reflex is because of a problem here

Answer 37

middle ear

Question 37

acoustic reflexes tested at these frequencies

Answer 37

500, 1K, 2K, 4K

Question 37

acoustic reflex tests can help screen for __ ___ and __ , which often don't have acoustic reflexes, even with normal hearing

Answer 37

auditory neuropathy; APD