Abstract
Background
Dystonic tics differ from clonic tics by their slower and more sustained nature. Dystonic tics are often present in patients with Tourette syndrome (TS) and other tic-disorders. However, their phenomenology and impact on overall impairment have not been extensively studied.
Materials and methods
We assessed clinical history and tic duration in video-recordings from patients with TS evaluated at our movement disorders clinic. Dystonic tics were defined as those lasting ≥ 1000 ms (ms).
Results
Of the total of 201 patients with TS, there were 156 with video-recordings suitable for tic duration analysis, of their tics, 57 (36.5%) of whom had dystonic motor tics, including 9 (5.7%) with dystonic phonic tics. Dystonic motor tics had a duration range between 1033 and 15,000 ms and dystonic phonic tics between 1132 and 17,766 ms. Patients with dystonic tics were older 24.4 vs. 16.5 years (P = 0.005) and had an older age at onset 12.9 vs. 7.2 years (P < 0.001), than patients without dystonic tics. The bivariate analysis showed an association between the presence of dystonic tics, greater tic severity and wider body distribution. The multivariate regression analysis showed a statistical association with older age at evaluation (P = 0.001), greater tic severity on video-recordings (P = 0.001) and co-occurrence with complex motor tics (P = 0.020). The presence of dystonic tics increased the risk for being considered for deep brain stimulation therapy, odds ratio: 15.7 (P = 0.002).
Conclusion
Dystonic tics, observed in about a third of patients with TS, are associated with increased severity of TS.
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Dr. B-C: gathered and analyzed the data, made the statistical analysis, conceptualized, wrote the first draft, and reviewed the manuscript; Dr. A-J: gathered and analyzed data; Dr. J: gathered the data, conceptualized and reviewed the manuscript.
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Supplementary Information
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Supplementary file1 This is 11-year-old boy with tics since the age of four has dystonic tic predominantly involving his face (blepharospasm and facial grimacing) lasting 1030 milliseconds (MOV 909 KB)
Supplementary file2 This 8-year-old boy has tics with sustained abdominal contractions lasting 4350 milliseconds. Eye-blinking tics are observed at the end of video (MOV 990 KB)
Supplementary file3 This is a 23-year-old man with cervical, truncal and shoulder dystonic (“stretching”) tics lasting 9266 milliseconds (AVI 85196 KB)
Supplementary file4 This 12-year-old boy with severe TS has simple dystonic phonic tics manifested by expiratory sound lasting over 2000 milliseconds (see Figure 1A) (AVI 23708 KB)
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Baizabal-Carvallo, J.F., Alonso-Juarez, M. & Jankovic, J. Dystonic motor and phonic tics in Tourette syndrome. J Neurol 269, 5312–5318 (2022). https://doi.org/10.1007/s00415-022-11174-z
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DOI: https://doi.org/10.1007/s00415-022-11174-z