What do nystagmus findings indicate in the evaluation of benign paroxysmal positional vertigo (BPPV)?

Updated: Feb 15, 2018
  • Author: John C Li, MD; Chief Editor: Arlen D Meyers, MD, MBA  more...
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Answer

Classic posterior canal BPPV produces geotropic rotatory nystagmus. The top pole of the eyes rotates toward the undermost (affected) ear.

Purely horizontal nystagmus indicates horizontal canal involvement.

Sustained or nonfatiguing nystagmus may indicate cupulolithiasis rather than canalithiasis.


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