Positional Nystagmus in Patients Evaluated for Dizziness and Imbalance

Figure 4

The number of test positions with nystagmus of each direction (up, down, right, and left) is shown grouped by patient diagnosis. CNS, central nervous system involvement; HC-BPPV, horizontal canal benign paroxysmal positional vertigo; L, left; MD, multifactorial disequilibrium; NV, nonvestibular involvement; PC-BPPV, posterior canal benign paroxysmal positional vertigo; R, right; UVD, unilateral vestibular dysfunction.