Dizziness
I. Central and Peripheral Causes of Nystagmus
Central | Peripheral |
|---|---|
Mass lesions | Benign positional vertigo |
Multiple sclerosis | Labyrinthitis |
Epilepsy | Cerebellopontine angle tumors |
Vertebrobasilar insufficiency | Barotrauma |
Basilar migraine | Perilymphatic fistula |
II. Characteristics of Central and Peripheral Nystagmus
Feature | Central | Peripheral |
|---|---|---|
Latency | None | 2-15 seconds |
Duration | 30 to >120 seconds | 5-30 seconds |
Fatiguability | +/- | + |
Vertigo | Absent (usually) | Present (usually) |
Fixation | No suppression | Suppression |
Direction | Vertical or horizontal | Horizontal or rotary |
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