Which physical findings suggests horizontal nystagmus in patients with dizziness, vertigo, and imbalance?

Updated: Mar 13, 2017
  • Author: Hesham M Samy, MD, PhD; Chief Editor: Robert A Egan, MD  more...
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Answer

Nystagmus of the horizontal semicircular canal is less common and is usually due to canalithiasis. Typically, it is s purely horizontal, geotropic (beating toward the downward ear), and asymmetric. The direction reverses with the change in head position from one side to the other in the supine position. The intensity of nystagmus is strongest when the head is rotated to the involved side. Another, even less common form, is horizontal canal BPPV due to cupulolithiasis. Typically, nystagmus is apogeaotropic (beating away from the down ear)


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