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Optogenetic Functional MRI
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[Altered Functional Connectivity in Patients with Transient Ischemic Attack by Resting-state Functional MRI].

Jian Guo1, Shu-Hui Cui1, Yi-Jia Guo1

  • 1Department of Neurology, West China Hospital, Sichuan University, Chengdu 610041, China.

Sichuan Da Xue Xue Bao. Yi Xue Ban = Journal of Sichuan University. Medical Science Edition
|May 21, 2019
PubMed
Summary
This summary is machine-generated.

Transient ischemic attack (TIA) patients show altered brain connectivity long after initial recovery. Working memory brain regions exhibit abnormal activation for extended periods post-TIA, impacting cognitive function.

Keywords:
Functional connectivityFunctional magnetic resonance imagingTransient ischaemic attackWorking memory

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Area of Science:

  • Neuroscience
  • Neurology
  • Medical Imaging

Background:

  • Transient ischemic attack (TIA) can lead to subtle, long-term neurological changes.
  • Understanding functional connectivity alterations is crucial for TIA patient recovery.
  • Resting-state functional magnetic resonance imaging (fMRI) offers insights into brain network dynamics.

Purpose of the Study:

  • To investigate longitudinal changes in resting-state functional connectivity in patients following a first-time TIA.
  • To compare functional connectivity patterns between TIA patients and healthy controls over time.
  • To explore the relationship between functional connectivity and cognitive performance post-TIA.

Main Methods:

  • Recruited 35 first-time TIA patients (right hemisphere) and 35 healthy controls.
  • Performed fMRI scans at 1 week and 3 months post-TIA.
  • Assessed resting-state functional connectivity using the right inferior prefrontal cortex (iPFC) as the region of interest (ROI).

Main Results:

  • At 1 week post-TIA, patients showed increased connectivity with the cerebellum and insula, and decreased connectivity with the middle frontal gyrus (MFG) compared to controls.
  • At 3 months post-TIA, patients exhibited decreased connectivity in the superior temporal gyrus (STG), insula, and thalamus.
  • Functional connectivity between the right iPFC, cerebellum, and insula correlated with working memory performance (2-back reaction time) at 1 week post-TIA.

Conclusions:

  • TIA patients experience persistent alterations in brain functional connectivity, particularly in working memory-related regions.
  • While acute neurological symptoms may resolve, underlying network dysfunction can endure.
  • These findings highlight the importance of long-term monitoring and potential interventions for TIA survivors.