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Flashcards in ear stuff 2 Deck (18):
1

Congenital Aural atresia is

1. spectrum of disorders present from birth
2. malformations of external auditory canal, TM, middle ear space or ossicles

2

congenital aural atresia treatment

surgery

3

meniere's disease signs

1. vertigo lasting more than 20 minutes
2. hearing loss
3. tinnitus
4. aural fullness
5. chronic disease
6. fluctuating hearing loss

4

Meniere's disease is

1. swelling of endolymphatic space from a problem of stria vascularis
2. loss of endocochlear potential due to poor ion conduction

5

Meniere's disease treatment

1. diuretic for swelling
2. Mg for vertigo
3. surgery if non-responsive
4. injection of gentamicin into canals

6

8th nerve tumor is a

vestibular schwannoma

7

vestibular schwannoma early signs

1. hearing loss
2. tinnitus (unilateral)
3. mild/fleeting vertigo

8

vestibular schwannoma late signs

1. facial numbness
2. ataxia
3. headache
4. visual loss
5. long tract signs
4 death by herniation

9

vestibular schwannoma two forms

1. NF2
2. sporadic form

10

NF2

1. NF2 is a tumor suppressor gene that codes for merlin
2. merlin involved in cell-cell or cell-matric interaction

11

Sporadic vestibular schwannoma is

possible double hit mutation to merlin

12

vestibular schwannoma treatment

1. watchful waiting to see if tumor grows
2. surgical resection
3. radiosurgery or radiotherapy

13

sensory hearing loss us usually due to

loss of hair cells or impaired inner ear homeostasis

14

hair cell loss is commonly due to

1. prebycusis
2. noise trauma
3. ototoxicity
4. genetics

15

damage to outer or inner hair cells can result in

irregularity in the pattern or loss of architecture of individual hair cells .
Without hair cells, mechanical sound waves are unable to be transduced to electrical signals for the nervous system

16

sensory loss can also be due to

improper inner ear homeostasis.
Like in endolymphatic hydrops

17

etiology of endolymphatic hydrops

1. stria vascularis, the structure on the lateral edge of the scala media. Is responsible for maintaining homeostasis of inner ear
2. creates and maintains the endolymphatic potential

18

etiology of meniere's disease

1. potential not maintained properly
2. results in disruption of ion transport, changes in ph, and changes in osmotic pressure of scala media.
3. changes ultimately cause fluid to enter and swelling of endolymphatic space.