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Related Concept Videos

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Author Spotlight: Advancing Cardiovascular Research — Tailored Langendorff Perfusion Techniques for Improved Experimental Outcomes
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Perfusion/Diffusion mismatch is valid and should be used for selecting delayed interventions.

Stephen Davis1, Bruce Campbell, Soren Christensen

  • 1Department of Medicine, Melbourne Brain Centre at the Royal Melbourne Hospital, University of Melbourne, Parkville, Melbourne, Victoria, 3050, Australia, stephen.davis@mh.org.au.

Translational Stroke Research
|December 11, 2013
PubMed
Summary
This summary is machine-generated.

The mismatch between perfusion and diffusion imaging in acute ischemic stroke identifies the ischemic penumbra, a brain region targeted for reperfusion therapies. Advanced neuroimaging of this mismatch is recommended for selecting patients for delayed stroke treatments.

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Area of Science:

  • Neurology
  • Radiology
  • Stroke Medicine

Background:

  • The ischemic penumbra, a hypoperfused brain region at risk in acute ischemic stroke, is a key target for reperfusion therapies.
  • Clinical trials demonstrate a strong link between reperfusion in patients with a perfusion-diffusion mismatch and improved outcomes.
  • Attenuation of infarct growth correlates with successful reperfusion and clinical benefits.

Purpose of the Study:

  • To highlight the significance of the perfusion-diffusion mismatch as a marker for the ischemic penumbra in acute ischemic stroke.
  • To discuss the role of advanced neuroimaging in identifying the penumbra beyond the standard treatment window.
  • To advocate for the use of mismatch imaging in patient selection for delayed reperfusion therapies.

Main Methods:

  • Utilizing magnetic resonance imaging (MRI) to identify the mismatch between larger perfusion lesions and smaller diffusion lesions.
  • Employing computed tomography perfusion (CTP) to assess mismatch using relative cerebral blood flow or volume against perfusion delay.
  • Implementing automated quantitative assessment techniques with thresholding to differentiate the penumbra from benign oligemia.

Main Results:

  • The perfusion-diffusion mismatch is a validated signal of the ischemic penumbra, indicating tissue at risk.
  • CTP provides a comparable penumbral marker to MRI.
  • Automated mismatch assessment allows for rapid, quantitative analysis.

Conclusions:

  • The ischemic penumbra, identified by mismatch imaging, often extends beyond the 4.5-hour window for intravenous thrombolysis.
  • While further validation is needed, current evidence supports using advanced neuroimaging of mismatch for selecting patients for delayed therapies in clinical trials.
  • Mismatch imaging is crucial for optimizing treatment strategies in acute ischemic stroke, particularly for extended time windows.