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Related Concept Videos

Alterations in Muscle Tone ll01:12

Alterations in Muscle Tone ll

Alterations in muscle tone are common manifestations of neurological disorders and reflect dysfunction within different nervous system regions. Spasticity, paratonia, and dystonia represent distinct forms of hypertonia, each with unique mechanisms, clinical features, and diagnostic importance.CharacteristicsSpasticity happens from upper motor neuron lesions and is characterized by velocity-dependent resistance to passive movement. Clinical features include:Exaggerated deep tendon reflexesClonus...

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Engaging dystonia networks with subthalamic stimulation.

Konstantin Butenko1, Clemens Neudorfer1,2, Till A Dembek3

  • 1Center for Brain Circuit Therapeutics, Department of Neurology, Brigham & Women's Hospital, Harvard Medical School, Boston, MA 02115.

Proceedings of the National Academy of Sciences of the United States of America
|January 8, 2025
PubMed
Summary

Deep brain stimulation (DBS) targeting within the subthalamic nucleus (STN) shows promise for dystonia. Different STN regions and connected pathways correlate with improvements in specific dystonia types, guiding future DBS strategies.

Keywords:
cervical dystoniadeep brain stimulationlimb dystoniastructural connectivitysweet-spot analysis

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Area of Science:

  • Neuroscience
  • Neurosurgery
  • Movement Disorders

Background:

  • Deep brain stimulation (DBS) is an effective treatment for dystonia, with the internal pallidum historically being the primary target.
  • Subthalamic nucleus (STN) stimulation is a newer approach, but optimal targeting and understanding of its underlying mechanisms for dystonia remain underexplored.
  • Dystonia encompasses various subtypes, and patient outcomes with DBS vary, suggesting a need to investigate specific neural substrates for different dystonia manifestations.

Purpose of the Study:

  • To investigate the neural substrates of DBS effects in isolated dystonia patients.
  • To correlate specific subthalamic stimulation sites and associated brain networks with improvements in different dystonia symptoms (appendicular, cervical, blepharospasm).
  • To provide guidance for optimizing DBS targeting and programming for dystonia.

Main Methods:

  • Analysis of a multicenter cohort of 58 isolated dystonia patients who underwent subthalamic DBS.
  • Correlation of stimulation site locations with clinical improvements in appendicular, cervical, and blepharospasm symptoms.
  • Structural and functional connectivity analyses to map pathways and networks associated with symptom alleviation.

Main Results:

  • Stimulation in the ventral oral posterior nucleus of the thalamus and adjacent areas improved cervical dystonia.
  • Dorsolateral STN stimulation correlated with improvements in limb dystonia and blepharospasm.
  • Distinct structural and functional connectivity patterns were associated with improvements in cervical versus limb dystonia and blepharospasm.

Conclusions:

  • Specific subthalamic and thalamic targets are associated with differential improvements in dystonia symptoms.
  • Cervical dystonia improvement is linked to cerebellothalamic, corticospinal, and pallidosubthalamic tracts and the cingulo-opercular network.
  • Limb dystonia and blepharospasm improvements are associated with hyperdirect and subthalamopallidal pathways and motor cortex connectivity, informing future DBS strategies.