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To the Editor:
Lombardi et al.1 report on a series of 18 patients with essential tremor (ET) preoperatively assessed for cognition and mood and contrasted their results with similar studies in 18 patients with PD.
We retrospectively studied 55 patients with ET (34 women) for cognitive and affective state. The mean age was 57 (vs 66 years in the study by Lombardi et al.1) but an equal level of education to the Lombardi study at 14 ± 3 years.2 Our patients had milder tremor, rating scale score 12 ± 4 vs 18 ± 9. Our patients were assessed while taking no medications, whereas eight of the 18 patients in the Lombardi study were taking either propranolol or primidone; the latter is known to have potential negative cognitive effects. Results in our ET patient population were contrasted with 79 patients with cervical dystonia and tremor (CD/T). Tremor was objectively defined similarly to those with ET, utilizing an accelerometer, motus tremometer, and voice oscilloscopic assessments on two or more occasions with a fixed tremor rate for durations of 2 minutes or longer …
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