What does a positioning exam reveal about 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

Typical nystagmus related to posterior semicircular canal benign positioning and its symptoms are delayed by several seconds (latency). They peak in 20-30 seconds and then decay (paroxysmal), with complete resolution of symptoms while the patient maintains the same head position (habituation). Symptoms and reversed nystagmus may occur when the patient is brought back to a sitting position. Therefore, benign positioning nystagmus is latent, paroxysmal, geotropic, reversible, and fatigable.


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