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10 Cards in this Set
- Front
- Back
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Seesaw nystagmus is a pendular oscillation that consists of elevation and intorsion of one eye and depression and extorsion of the fellow eye that alternates every half cycle.
Cause.... (2) |
Midbrain lesion
Pituitary tumour |
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Downbeat nystagmus is defined as nystagmus with the fast phase beating in a downward direction.
Causes... (3) |
50% unknown cause
Brainstem (Arnold Chiari malf, enceph, trauma, drugs) Heat Stroke |
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Upbeat nystagmus is defined as nystagmus with the fast phase beating in an upward direction.
Causes... (2) |
Medulla/Cerebellar lesion
BPPV |
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Torsional (rotary) nystagmus refers to a rotary movement of the globe about its anteroposterior axis.
Causes... |
Ant AND Post semicircular canals on the same side
Lat Medulla lesion |
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Nystagmus is described by the direction of the slow phase.
T/F |
FALSE
Nystagmus is described by fast phase |
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If a lesion destroys the labyrinth function then the nystagmus is always away from the damaged ear.
T/F |
TRUE
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In an irritative lesion the nystagmus is away from the affected ear.
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FALSE
In irrative lesions the nystagmus is towards the irritated ear. |
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Cerebellar lesions result in nystagmus towards the ipsilateral side.
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TRUE
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A lady presents with a left direction nystagmus, present in all gazes. You diagnose a Right Total Vestibular Failure.
Can you reassure her that the nystagmus will reduce to when she looks to the left and will eventually stop altogether? |
TRUE
Central nervous system compensation! |
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Central vertigo NOT associated with nausea and vomiting, hearing loss or tinnitus.
Δ? |
Basilar Artery Migraine
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