Research Article
Positional Nystagmus in Patients Evaluated for Dizziness and Imbalance
Table 2
Direction and intensity characteristics of positional nystagmus with
= number of patients.
| | Type | () | Positions with nystagmus | Nystagmus slow phase velocity (°/s) | | Range | Average | Standard deviation |
| | Direction-fixed | (31) | 44 | 1–20 | 3.93 | 3.79 | | Up | (8) | 16 | 1–20 | 4.81 | 4.51 | | Down | (5) | 7 | 1–18 | 4.57 | 6.24 | | Right | (6) | 13 | 2–6 | 3.13 | 1.46 | | Left | (12) | 8 | 1–6 | 3.00 | 1.68 | | Direction-changing | (11) | 18 | 1–15 | 5.49 | 3.77 | | Ageotropic | (4) | 13 | 1–13 | 5.54 | 2.73 | | Mixed | (3) | 11 | 1–15 | 5.27 | 3.85 | | Up | (4) | 1 | — | 2.00 | — | | Down | 3 | 2–5 | 3.33 | 1.53 | | Right | 3 | 2–12 | 5.00 | 6.08 | | Left | 6 | 3–15 | 7.67 | 5.23 | | Overall | (42) | 81 | 1–20 | 4.64 | 3.84 |
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