Leg tremor scores were done two different ways. Approximately 2 months later, randomized, blinded, still photographs of those same spirals and drawings were distributed and scored by the same TRG members for comparison. photographed writing, scores of spirals and handwriting samples were compared when done while watching a video of task. Specifically, for comparison of “live” writing vs. The mean scores of the 16 and 15 member groups were then used to statistically analyzed the different methods. At a later date, 15 TRG members blindly rated cursive and script writing samples from 24 different subjects. Sixteen movement disorders specialists from the TRG met and scored the 12 ET subjects performing the first 3 tasks. Videos were all done in front of the same background. Videotapes (12 subjects) and writing samples (24 different subjects) were done at Methodist Neurological Institute (WO) after subjects signed video consent (Methodist Research Institute IRB). we compared different ways to assess leg tremor (sitting heal to shin vs. if they only hold one arm out at a time, 3. whether arm tremor ratings (postural and wing-beating) are similar if the subjects holds both hands out concurrently vs. whether assessments of spirals and writing samples are similar if the rater only sees the end result on a photograph/paper as opposed to actually watching the task on video and seeing the end result, 2. We assessed different ways to evaluate four major components of the TETRAS: 1. Writing tremor was rated worse if only rating the spiral/writing photos (p < 0.05) rather than also viewing the writing process, arm tremor scores were higher if each arm was rated individually (p < 0.001), heal to shin scores were higher when done sitting (p = 0.01), and cursive writing tended to be rated higher than script (p = 0.08).ĭiscussion: Minor procedure differences when administering the TETRAS can significantly alter results. Results: Intraclass correlation coefficients (ICC) were excellent (>0.95) for all arm assessments. compared cursive vs script writing samples. whether heal to shin tremor scores vary between supine and sitting, and 4. whether arm tremor ratings (postural and wing-beating) are similar if the subjects hold both hands out concurrently vs. whether assessments of spirals and writing samples are similar if the rater only sees the end result as opposed to actually watching the task, 2. Methods: Using blinded, randomized videotapes, a group of tremor experts evaluated multiple ET patients to determine: 1. Several tasks have multiple possible variations that have never been compared to determine if they impact score. However, similar to all other tremor rating scales, specific instructions for individual tasks are based mostly on expert opinion and tradition. Introduction: The Tremor Research Group Essential Tremor Rating Scale (TETRAS) is a well-validated instrument to assess essential tremor.
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