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Ischemic Stroke ll: Pathophysiology01:15

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An ischemic stroke occurs when a cerebral blood vessel becomes obstructed, most often by a thrombus or embolus, interrupting the delivery of oxygen and glucose to brain tissue. Because neurons rely on continuous aerobic metabolism, energy failure begins within minutes of reduced perfusion. The region receiving the least blood flow becomes the infarct core, an area of irreversible cellular death. Surrounding this core lies the penumbra, a zone of hypoperfused but still viable tissue that is...
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2-Vessel Occlusion/Hypotension: A Rat Model of Global Brain Ischemia
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Selective neuronal loss in rescued penumbra relates to initial hypoperfusion.

J V Guadagno1, P S Jones, F I Aigbirhio

  • 1Department of Clinical Neurosciences, Neurology Unit, Addenbrooke's Hospital, Cambridge, UK.

Brain : a Journal of Neurology
|August 6, 2008
PubMed
Summary

Selective neuronal loss (SNL) occurs in brain areas rescued from stroke, even with early reperfusion. This neuronal loss correlates with initial hypoperfusion, suggesting a new therapeutic target for stroke recovery.

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Area of Science:

  • Neuroscience
  • Radiology
  • Stroke Research

Background:

  • Selective neuronal loss (SNL) in the rescued penumbra may explain incomplete recovery after stroke, despite successful early reperfusion.
  • Previous studies on SNL were limited by imaging techniques (SPECT) and did not fully account for volume loss or link SNL to initial hypoperfusion.

Purpose of the Study:

  • To map SNL in non-infarcted brain tissue using quantitative (11)C-flumazenil (FMZ)-PET.
  • To assess the relationship between SNL and acute-stage hypoperfusion identified by computerized tomography (CT) perfusion.
  • To investigate SNL in patients with acute ischemic stroke and early recanalization.

Main Methods:

  • Prospective recruitment of seven acute stroke patients with early recanalization and good outcomes.
  • Acquisition of acute-stage CT perfusion and follow-up quantitative (11)C-flumazenil PET scans.
  • FMZ image analysis incorporated adjustments for potential post-stroke volume loss.

Main Results:

  • Significantly reduced FMZ binding, indicative of SNL, was observed in non-infarcted middle cerebral artery cortical areas compared to the unaffected hemisphere.
  • Voxel-based analysis revealed extensive clusters of reduced FMZ binding in affected peri-insular, superior temporal, and prefrontal cortices.
  • A significant negative correlation was found between FMZ binding and initial hypoperfusion, with volume loss correction not altering significance.

Conclusions:

  • This study establishes the presence and distribution of FMZ binding loss in non-infarcted brain areas following stroke.
  • The findings suggest that SNL in the rescued penumbra is proportional to initial hypoperfusion.
  • Peri-infarct SNL may represent a novel therapeutic target for improving stroke recovery.