lec 13

Question 1

what is the maximum conductive hearing loss rule?

Answer 1

• final (masked) air-bone gaps do not usually exceed 60dB HL
• after this, AC tone is usually intense enough to stimulate other ear by BC

Question 2

what is the masking dilemma? when does it occur?

Answer 2

• when minimum amount of masking noise is intense enough to cross over
• only occurs when both ears have large air-bone gap

Question 3

what is the shortcut to the AC masking rule?

Answer 3

• when there is a > or = to 40dB difference between R and L AC thresholds, BC threshold in better ear cannot be worse than AC threshold (so you know you have to mask)

Question 4

review: when to mask BC?

Answer 4

when air-bone gap exceeds 10dB

Question 5

review: when to mask AC?

Answer 5

• when ACte - 40 is > or = to BCnte
• when ACte - ACnte is > or = to 40dB

Question 6

review: when to mask for SRT?

Answer 6

when SRTte - 40 is > or = to any BCnte

Question 7

review: when to mask for WRS?

Answer 7

• when presentation level - 40 is > or = to any BCnte
• determined before starting

Question 8

what are the PTA (AC) at 500, 1000, and 2000 Hz classifications:

a) 16-25dB
b) 26-40dB
c) 41-55dB
d) 56-70dB
e) 71-90dB
f) 91+ dB

Answer 8

a) slight or minimal in child, normal in adult
b) mild
c) moderate
d) moderately severe
e) severe
f) profound

Question 9

what is one problem with the classification system?

Answer 9

PTA is only measured at 3 frequencies. someone can still have hearing loss in other frequencies and be classified as “normal” by the system

Question 9

what does a U-shaped audiogram indicate?

Answer 9

congenital hearing loss

Question 10

what does a reverse U-shaped audiogram indicate?

Answer 10

mixed hearing loss