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The ischaemic penumbra.

O Touzani1, S Roussel, E T MacKenzie

  • 1University of Caen, CNRS-UMR 6551, Cyceron, France. o.touzani@cyceron.fr

Current Opinion in Neurology
|February 15, 2001
PubMed
Summary
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The ischaemic penumbra, brain tissue at risk after stroke, is defined as salvageable tissue threatened by cell death. Understanding its complex temporal and spatial dynamics is key to developing effective stroke treatments.

Area of Science:

  • Neurology
  • Cerebrovascular disease
  • Neuroscience

Background:

  • The ischaemic penumbra is a critical concept in stroke, representing brain tissue at risk of infarction.
  • A universal definition and understanding of the penumbra remain elusive.
  • This review synthesizes current knowledge on the penumbra's characteristics and implications.

Purpose of the Study:

  • To define the ischaemic penumbra in the context of focal cerebral lesions.
  • To review the temporal and spatial evolution of the penumbra.
  • To discuss the salvageability of penumbral tissue and challenges in its clinical assessment.

Main Methods:

  • Literature review of pertinent studies on the ischaemic penumbra.
  • Synthesis of findings from animal studies on penumbral tissue salvage.

Related Experiment Videos

  • Analysis of the limitations of current clinical rating scales for assessing the penumbra.

    • Main Results:

    • The penumbra is defined as salvageable brain tissue surrounding an irreversibly damaged core, threatened by necrosis.
    • Penumbra evolution is both spatial and temporal, representing a progressive phenomenon.
    • Penumbral tissue exhibits high biological activity, involving cell death and repair mechanisms.

    Conclusions:

    • The ischaemic penumbra is a dynamic, salvageable area crucial for stroke outcome.
    • Current clinical scales are inadequate for evaluating the penumbra due to functional similarities between damaged and silent tissue.
    • Further research into the molecular, electrophysiological, and vascular aspects of the penumbra is essential for therapeutic development.