Week 9 Flashcards
Peripheral vestibular disorders are found where?
In the ear
Central vestibular disorders are found where?
In the brain
Rotational vertigo is found where?
SCC or central projection
Sensational vertigo of body tilt is found where?
Otolith system
An acute unilateral vestibular lesion affects what 2 things?
labyrinthe or vestibular nerve
What 2 types of nystagmus can an acute unilteral vestibular lesion cause?
Spontaneous or Head-shaking nystagmus
The head impulse test, test what?
Rotational VOR
The head heave test, test what?
Translational VOR
Static imbalances checks for what?
Gaze stability
How do we truly test static imbalance?
Remove fixation by using frenzel goggles or high plus lenses
Dynaimic imbalance checks for nystagmus by doing what test?
Doll’s eye testing
Positionally induced imbalance checks for nystagmus using what diagnositic maneuver?
When the patient is in the Dix-Hallpike Maneuver w/ head turned to 45 degrees to right or left
What’s the most common cause of dizziness (positionally induced imbalance)?
BBPV = Benign Paroxysmal Positional Vertigo
What is the treatment for positionally induced imbalance?
Epley Maneuver
What 3 other things can induce nystagmus?
- Sound
- Hyperventilation
- Valsalva
To do horizontal caloric testing, the patient is in supine position with head elevated ___ degrees?
30 degrees
Warm water in caloric test causes what? In what direction
Causes exicitation
- fast pace is same direction as warm water was put in ear
Cold water in caloric test cases what? What direction?
Causes inhibition
- fast pace is opposite direction as cold water was put in ear (COWS)
To do vertical caloric testing, the patient is in supine position with head elevated ___ degrees?
60 degrees
What issue is secondary to VOR?
Vertigo
Alcohol gaze nystagmus (AGN) is due to what?
unequal alcohol concentration between the blood and endolymph
Wallenberg’s syndrome is found due to a lesion or low brainstem stroke where?
in Mediulla
A lesion in what part of the cerebellum can affect the medulla?
Vertebrobasilar circulation
In a skew deviation, they hyper eye will be extorted or intorted?
Intorted
Explain arnold chiari malformation.
Herniation of brainstem in foramen magnum
What does arnold chiari cause?
Oscillopsia, dizziness, neck pain, headache
What 2 findings can be found in ACM?
- Huge esotropia
2. Ataxia
What 2 eye movements are spared in lesions of abducen’s nucleus?
Vertical and vergence eye movements
The midbrain houses functions for what 3 things?
- Vertical Gaze
- Pupils
- Lids
What is the key structure affected in DMS?
Posterior commissure
What is the key finding for progressive supranuclear palsy?
Loss of convergence
ALS affects what?
eye movements
Thalamic heme causes what?
downward gaze palsy with ET
Parkinson’s causes what?
- Hypometric saccades
- CI
- Lid lag
Huntington’s Disease causes what?
Slow Saccades
Hemispheric Stroke causes what?
Slow saccade and pursuit
Parietal lobe lesion causes what?
loss of attention to target
Frontal lobe lesion causes what?
impaired motor planning
Ocular motor apraxia causes what?
Loss of initiation control
