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Longitudinal thalamic diffusion changes after middle cerebral artery infarcts.

D Hervé1, N Molko, S Pappata

  • 1The Department of Neurology, CHU Lariboisière, Paris, France.

Journal of Neurology, Neurosurgery, and Psychiatry
|January 18, 2005
PubMed
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Diffusion tensor imaging reveals progressive thalamic diffusion increase after middle cerebral artery (MCA) infarcts, indicating remote tissue changes. This may reflect neuronal loss and is crucial for understanding stroke recovery.

Area of Science:

  • Neuroimaging
  • Stroke research
  • Diffusion Tensor Imaging (DTI)

Background:

  • Cerebral infarcts cause remote functional and microstructural damage.
  • Thalamic hypometabolism correlates with motor recovery after middle cerebral artery (MCA) infarcts.
  • Tissue changes underlying thalamic hypometabolism post-MCA infarct are poorly understood.

Purpose of the Study:

  • To quantify in vivo longitudinal microstructural changes in the thalamus after MCA infarcts using DTI.
  • To investigate the relationship between DTI metrics and remote effects of MCA infarcts.

Main Methods:

  • Diffusion tensor imaging (DTI) was performed on nine patients with isolated MCA infarcts.
  • Mean diffusivity (MD) and fractional anisotropy (FA) of the thalamus were measured from 1 week to 6 months post-stroke.

Related Experiment Videos

  • Thalamic region volume and ipsilateral/contralateral MD indices were analyzed.

    • Main Results:

    • Mean diffusivity (MD) significantly increased in the ipsilateral thalamus between 1 and 6 months post-stroke.
    • No significant changes in fractional anisotropy (FA) were observed.
    • In most patients, ipsilateral/contralateral MD indices exceeded control values, with some showing an early transient decrease in MD.

    Conclusions:

    • An increase in thalamic diffusion post-MCA infarct occurs after the first month, likely due to neuronal and glial cell loss.
    • Transient decreases in diffusion may indicate early cellular swelling or microglial activation.
    • Further research is needed to correlate these DTI findings with clinical outcomes in stroke recovery.