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Hearing Disorders > Retrocochlear > Flashcards

Retrocochlear Flashcards

1
Q

Acoustic neuroma is

A

VIII nerve tumor

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2
Q

the site of lesion of the VIII nerve tumor

A

inferior part of the vestibulat branch (vestibular schwannoma)

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3
Q

Prevalence of acoustic neuroma

A

1/100,000 per year

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4
Q

Acoustic neuroma is common in adults who are ….

A

More than 30 y/o

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5
Q

Symptoms of acoustic neuroma

A 
Hearing loss 
Tinnitus 
Dizziness 
Facial numbness
Poor SRS
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6
Q

Causes of acoustic neuroma

A 
Naturally occur 
CVA 
Neurofibromatosis
Multiple sclerosis 
Hemorrhage 
Sylphilis 
Kernicterus
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7
Q

Diagram of acoustic neuroma

A

Asymmetric SNHL

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8
Q

OAE of acoustic neuroma

A

Present in both ears

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9
Q

Tympanogram of acoustic neuroma

A

Type A

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10
Q

ABR of acoustic neuroma

A

Abnormal (wave V)

But wave I is normal

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11
Q

Reflex decay of acoustic neuroma

A

> 50%

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12
Q

Acoustic reflex of acoustic neuroma

A

Absent for both ears

But present for ipsilateral non-involved ear

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13
Q

CAPD stands for

A

Central auditory processing disorder

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14
Q

Characteristics of CAPD patients

A

Normal hearing but having problem with auditory information processing

+ADHD/ dyslexic

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15
Q

OAE of CAPD

A

Normal

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16
Q

Reflexes of CAPD

A

Normal

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17
Q

What would WDS be if the inner hair cells are impaired?

A

Poor WDS

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18
Q

What would the WDS be if the outer hair cells are impaired?

A

Good WDS

19
Q

SNHL severity if OHC are impaired

A

60dB HL

20
Q

Disorders involving impairment of OHC

A
  • presbycusis

- noise-induced hearing loss

21
Q

Tympanometry ….. Hz probe tone

A

1,000 Hz

Traditional 226 Hz (@90dB SPL)

22
Q

Tympanometry provides little to no information for infants until …… of age

A

7 months

23
Q

Normal tympanogram = type ….

A

Type A

24
Q

Type As tympanogram

A

reduced compliance (stiffened)

25
Q

Patients with ….. have type As tympanogram

A

otosclerosis

26
Q

Type Ad tympanogram

A

Increased/ hyper compliance

Discontinuity, ossicular chains

27
Q

Type B tympanogram

A

Infections, fluid in the middle ear space or perforated eardrum

28
Q

Type C tympanogram

A

normal compliance

But retracted eardrum

29
Q

Peak pressure for type Ad tympanogram

A

+15daPa

30
Q

Type Ad compliance

A

1.9 cc

31
Q

Type As peak pressure

A

-25 daPa

32
Q

Type A compliance

A

0.2 cc

33
Q

Peak pressure of type C

A

-150 daPa

34
Q

Compliance for type C

A

normal or reduced

35
Q

……. is also used to detect non-organic HL, facial nerve function and possible retrocochlear pathology

A

acoustic reflex

36
Q

If there is middle ear dysfunction or severe hearing loss, reflex will be

A

absent

37
Q

Reflex decay test presents stimulus tone @ what frequency and intensity? How long?

A

10dB above reflex threshold @ 500 or 1000 Hz for 10 seconds

38
Q

OAE reveals the status of …..

A

cochlea

39
Q

ABR reveals the status of

A

neural integrity

40
Q

ABR (tone burst) …….. thresholds …..

A

predict thresholds within 10-20 dB HL

41
Q

If TEOAE is present, HL is

A

below mild

42
Q

If DPOAE is present, HL is

A

below moderate

43
Q

Stimuli for TEOAE

A

clicks (transient)

44
Q

Stimuli for DPOAE

A

distortion product (3 tones, different frequencies)

Hearing Disorders (7 decks)

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