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Related Experiment Video

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Circumscribed Capsular Infarct Modeling Using a Photothrombotic Technique
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Longitudinal changes in resting-state brain activity in a capsular infarct model.

Donghyeon Kim1, Ra Gyung Kim2, Hyung-Sun Kim2

  • 1School of Information and Communication, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea.

Journal of Cerebral Blood Flow and Metabolism : Official Journal of the International Society of Cerebral Blood Flow and Metabolism
|October 30, 2014
PubMed
Summary

Subcortical strokes in elderly patients impact brain activity and motor function. Rehabilitation aids recovery only with partial internal capsule damage, necessitating new therapies for complete damage.

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Area of Science:

  • Neuroscience
  • Neurology
  • Rehabilitation Medicine

Background:

  • Subcortical infarcts, a type of stroke, are increasingly affecting elderly populations.
  • Understanding the impact of these lesions on motor function and rehabilitation is crucial.

Purpose of the Study:

  • To investigate the effects of capsular infarcts on brain activity and motor recovery.
  • To evaluate the efficacy of rehabilitative training in a rat model of subcortical stroke.

Main Methods:

  • Photothrombotic capsular infarct models were created in Sprague-Dawley rats.
  • Longitudinal resting-state brain activity was assessed using 2-deoxy-2-[(18)F]-fluoro-D-glucose-micro positron emission tomography (FDG-microPET).
  • Motor recovery was evaluated through daily single-pellet reaching task (SPRT) training.

Main Results:

  • Capsular infarcts led to persistent decreases in brain activity in various brain regions, including sensory and motor cortices, thalamus, and inferior colliculus.
  • Increased brain activity was observed in the ipsilesional internal capsule, contralesional red nucleus, and ventral hippocampus in the recovery group.
  • SPRT training improved motor recovery only in rats with incomplete damage to the posterior limb of the internal capsule (PLIC).

Conclusions:

  • Subcortical infarcts cause widespread, persistent changes in brain activity, indicative of diaschisis.
  • Remaining subcortical structures play a role in recovery after capsular infarct.
  • Rehabilitation strategies need to be adapted for patients with complete PLIC destruction to improve motor outcomes.