Natural history of SGCE-associated myoclonus dystonia in children and adolescents.
Valeria De Francesch, Ana Cazurro-Gutiérrez, Elze R Timmers and 9 others
PMID 39679832WHAT IT FOUND
In children with SGCE-associated myoclonus dystonia, motor symptoms worsen over time.
Action myoclonus and writing dystonia progressed significantly, causing reported declines in speech, writing, and walking. High rates of anxiety, OCD, and ADHD were also found.
Key findings
01Myoclonus during action worsened significantly over the follow-up period, with a mean annual increase of 1.36 points.
02Writing dystonia worsened significantly, with a mean annual increase of 0.518 points, and participants reported significant deterioration in speaking, writing, and walking.
0374% of screened participants had a neuropsychiatric condition, with anxiety disorders being the most common, followed by OCD and ADHD.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The sample size was small (38 participants), which limited the robustness of some statistical tests. Follow-up duration (mean 4 years) may be insufficient to fully capture the natural history of a lifelong condition. Psychiatric features were assessed cross-sectionally rather than longitudinally, so changes in psychiatric symptoms over time were not measured. A single rater scored all videos, preventing calculation of interrater reliability. Motor assessments were performed in clinical settings, which may not reflect day-to-day fluctuations or real-world performance due to anxiety during visits.
Declared interests
No conflicts of interest or funding sources were explicitly stated in the provided text.
The easy way to misread this
Do not assume that gait dystonia will worsen in all patients, as the study found no significant change in gait dystonia scores on average, though functional walking difficulties did increase. Additionally, the high prevalence of psychiatric comorbidities like anxiety and OCD is a key feature of the phenotype, not just a reaction to motor disability.