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Published on: September 12, 2020
Child Neurology: Early-Onset, Rapidly Progressive, and Refractory DYT-TOR1A Status Dystonicus
Hadley W Ressler1, Matthew Somerville1, Aubrey Hite2
1Pediatric Neurology, Wake Forest School of Medicine, Winston-Salem, NC.
Insights
DYT-TOR1A dystonia in a toddler rapidly worsened, becoming refractory to medications. Deep brain stimulation targeting the globus pallidus provided relief for this rare genetic condition.
Area of Science:
- Neurology
- Genetics
- Pediatric Movement Disorders
Background:
- Primary pediatric dystonia affects 16.4/100,000 children globally.
- DYT-TOR1A dystonia is a genetic form caused by TOR1A gene variants.
- Status dystonicus presents as severe, refractory dystonia, particularly challenging in young children.
Purpose of the Study:
- To report a case of a toddler with early-onset, rapidly progressive DYT-TOR1A dystonia.
- To describe the management of refractory status dystonicus using deep brain stimulation (DBS).
- To highlight unique planning considerations for DBS in a very young patient.
Main Methods:
- Genetic testing confirmed a maternally inherited TOR1A pathogenic variant (c.907_909del).
- The patient received optimized medical management including continuous infusions, which proved ineffective.
- Bilateral deep brain stimulation targeting the globus pallidus interni (GPi) was performed.
Main Results:
- Deep brain stimulation (DBS) of the bilateral globus pallidus interni (GPi) provided symptomatic relief of status dystonicus.
- The patient's condition was refractory to multiple optimized medications and infusions.
- Genetic analysis identified a maternally inherited pathogenic variant in the TOR1A gene.
Conclusions:
- Deep brain stimulation (DBS) can be an effective treatment for refractory status dystonicus in pediatric DYT-TOR1A dystonia.
- Management of young patients with severe dystonia requires careful planning and consideration of atypical presentations.
- This case underscores the complexities of symptom management and treatment expectations in pediatric DYT-TOR1A dystonia.
Abstract:
Primary (genetic) pediatric dystonia, characterized by sustained or intermittent muscle contractions that cause abnormal movements or postures, affects 16.4 in 100,000 children worldwide. It can be caused by various factors, including pathogenic variants in genes such as TOR1A, associated with DYT-TOR1A dystonia. In this report, we present the case of a toddler with DYT-TOR1A treated with deep brain stimulation (DBS) because of his early-onset, rapidly progressive, and refractory status dystonicus. Genetic testing confirmed a maternally inherited pathogenic variant in TOR1A, c.907_909del (p.Glu303del). His dystonia was refractory to multiple optimized medications and continuous infusions. Ultimately, DBS surgery to the bilateral globus pallidus interni (GPi) provided symptomatic relief of his status dystonicus. His atypical presentation and young age made it difficult to predict expected outcomes. Thus, he required unique planning considerations before placement of bilateral GPi DBS. This case highlights challenges in symptom management, anticipatory guidance, and treatment expectations in the complex and refractory condition of status dystonicus for a young patient with DYT-TOR1A.
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