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Diffusion tensor imaging in orthostatic tremor: a tract-based spatial statistics study.

Julián Benito-León1,2,3, Juan P Romero4,5, Elan D Louis6,7,8

  • 1Department of Neurology, University Hospital "12 de Octubre", Madrid, Spain.

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|October 8, 2019
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Summary

Orthostatic tremor (OT) is linked to white matter changes in the cerebellum and brain pathways, affecting cognitive functions like executive function and memory. These white matter alterations correlate with poorer performance on cognitive tests in OT patients.

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Area of Science:

  • Neuroscience
  • Neurology
  • Neuroimaging

Background:

  • The underlying causes of orthostatic tremor (OT) remain largely unknown.
  • Investigating white matter integrity may offer insights into OT pathogenesis.

Purpose of the Study:

  • To examine white matter alterations in patients with orthostatic tremor (OT).
  • To correlate these white matter changes with cognitive performance using a neuropsychological testing battery.

Main Methods:

  • Diffusion tensor imaging (DTI) was employed to compare white matter integrity between 14 OT patients and 14 healthy controls.
  • Whole-brain tract-based spatial statistics (TBSS) analysis was performed.
  • Correlations between diffusion metrics and cognitive test scores were assessed in the OT group.

Main Results:

  • OT patients exhibited significantly worse cognitive performance across multiple domains compared to controls.
  • Altered diffusivity was observed in the cerebellum, superior cerebellar peduncle, pontine tegmentum, internal capsule, corona radiata, insula, and corpus callosum.
  • White matter changes, particularly in the right anterior limb of the internal capsule, correlated with deficits in executive function, visuospatial ability, verbal memory, and visual memory.

Conclusions:

  • White matter abnormalities in OT are predominantly located in the cerebellum, its efferent pathways, and the frontal-thalamic-cerebellar circuit.
  • These findings suggest a link between white matter integrity and cognitive dysfunction in orthostatic tremor.
  • Further research is needed to elucidate the progression and functional impact of these white matter changes.