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Clinical features.
| Clinical features | Pt#444 | Pt#946 | Pt#2021 |
|---|---|---|---|
| Age of symptom onset, yrs | 8 | 1.4 | 7 |
| Age at diagnosis of EA | 15 | 10 | 13 |
| Triggers | Exertion/stress | Exertion/stress | Exertion/stress |
| Duration of attack | Hours | Hours | Hours |
| Nystagmus | All directions | All directions | All directions |
| Baseline ataxia | Mild | Mild | None |
| Response to acetazolamide | Good | Unknown | Good |
| Family history | Negative | Negative | Father |
