9.21 Vestibular Review Flashcards

1
Q

Inhibited side resting rate reaches 0 at

A

180˚/s

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2
Q

What happens to the inhibited side when it reaches over 180˚/s?

A

unable to contribute information

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3
Q

potential causes for dizziness

A
  • cardiovascular
  • meds
  • stroke
  • epilepsy
  • BPPV
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4
Q

Function of vestibular system

A
  • balance
  • equilibrium
  • gaze stabilization
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5
Q

What is gaze stabilization?

A

ability to focus on an object while you’re moving your head

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6
Q

What are the sensory organs in the vestibular system?

A

hair cells

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7
Q

otoconia are composed of

A

calcium carbonate

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8
Q

Which organs (general) have otoconia?

A

gravity sensitive organs

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9
Q

The vestibular nerve uses this cranial nerve

A

CN VIII

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10
Q

What is the reflex we talked about?

A

VOR

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11
Q

If a pt has a peripheral vestibular problem, what are some of the vestibular symptoms that might be seen?

A
  • dizziness
  • nystagmus
  • nausea
  • imbalance
  • difficulty with postural control
  • unsteady
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12
Q

What is oscillopsia?

A
  • objects in the visual field appear to oscillate

- perception that your environment/surroundings are moving when your head moves

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13
Q

medical causes of vestibular damage

A
  • viral infection

- ototoxia (i.e. metal poison)

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14
Q

What are symptoms of CNS vestibular problems?

A
  • disconjugate movements
  • purely vertical nystagmus
  • dysarthria
  • numbness/tingling
  • facial drooping
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15
Q

What is retinal slip?

A
  • error signal

- blurred vision with head movement

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16
Q

Associated symptoms that go along with peripheral neuritis?

A
  • oscillopsia
  • hearing
  • dizziness
17
Q

Many pts with frequent inner ear infections will ℅ ________

A

aural fullness

18
Q

CNS/VOR following injury

A

The CNS is able to modify the VOR after an injury

19
Q

nystagmus slow phase represents:

A

vestibular input/stimulation

20
Q

fast phase

A

correction of eye in orbit

21
Q

Direction of nystagmus (from the peripheral system) is always:

A
  • in the same direction

- regardless of where we gaze or position the eyeball

22
Q

What happens if the pt gazes in the direction of the fast phase?

A

nystagmus increases

23
Q

vertical nystagmus?

A

Peripheral nystagmus is not vertical

24
Q

Is nystagmus different for each eye?

A

no, same in both eyes

25
Pts with this will avoid rapid movements to the affected side
unilateral vestibular loss
26
For pts with unilateral vestibular loss, can the other side give input? What is a limiting factor?
- yes - only gives input up to a speed of 180˚/sec - after that, they receive no more input from the unaffected side
27
What is needed to recalibrate the VOR?
- vision | - head movement
28
VOR recalibration: environment
- need different positions, light, etc. | - context dependent
29
What types of movements are beneficial for unilateral vestibular injury to help recalibrate the VOR?
small movements that begin to blur