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Related Experiment Video

Updated: Sep 13, 2025

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Temporal Variability Analysis of Cortical Blood Flow in Rats with Hyperacute Cerebral Ischemia.

Bochao Niu1, Benjamin Klugah-Brown1, Yang Xia1

  • 1The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, 611731, China.

Neuroscience Bulletin
|July 25, 2025
PubMed
Summary

Cerebral ischemia impairs temporal variability in brain blood flow, impacting brain function. A novel state-space method revealed these changes and their connection to baseline conditions, offering insights into stroke.

Keywords:
Cerebral blood flowCerebral ischemiaLaser speckle contrast imagingState-spaceTemporal variability

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Biophysics

Background:

  • Cerebral ischemia reduces cerebral blood flow (CBF), causing hemodynamic instability.
  • Previous research primarily focused on reduced cortical CBF, neglecting temporal dynamics.
  • The impact of ischemia on hemodynamic variability and laterality remains unclear.

Purpose of the Study:

  • To investigate the temporal variability and laterality changes in cortical CBF during cerebral ischemia.
  • To introduce and validate a novel state-space method for analyzing hemodynamic changes.
  • To explore the relationship between ischemic changes and pre-occlusion baseline conditions.

Main Methods:

  • Collected cortical resting-state CBF data in rats with induced left carotid artery blockage.
  • Applied a novel state-space method to quantify temporal variability and laterality.
  • Validated the state-space method using stroke electroencephalogram (EEG) datasets.

Main Results:

  • Ischemia caused severe temporal variability impairments in multiple left cortical regions.
  • Laterality analysis revealed reduced unilateral mean, transition probability, and duration in affected left regions.
  • Impairments showed partial recovery post-reperfusion and correlated with baseline CBF.
  • Stroke patients demonstrated impaired temporal variability in the ischemic hemisphere.

Conclusions:

  • The state-space analysis effectively reveals damaged CBF temporal variability during cerebral ischemia.
  • Ischemic hemodynamic changes are linked to pre-occlusion baseline conditions.
  • The method shows promise for understanding stroke pathophysiology and predicting outcomes.