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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Optimized Management of Endovascular Treatment for Acute Ischemic Stroke
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[Patient selection for thrombolysis using perfusion and diffusion MRI. An overview].

G Thomalla1, P Ringleb, M Köhrmann

  • 1Klinik und Poliklinik für Neurologie, Neuro-Zentrum, Universitätsklinikum Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Deutschland.

Der Nervenarzt
|January 23, 2009
PubMed
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Multiparametric MRI, using perfusion and diffusion imaging, helps identify salvageable brain tissue after stroke. This advanced imaging guides timely reperfusion therapy, improving outcomes for stroke patients.

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Area of Science:

  • Neurology
  • Radiology
  • Medical Imaging

Context:

  • Multiparametric MRI, including diffusion and perfusion imaging, assesses ischemic tissue extent.
  • Magnetic resonance angiography evaluates vessel status.
  • Perfusion-diffusion mismatch quantifies salvageable brain tissue at risk of infarction.

Purpose:

  • To evaluate the role of perfusion-diffusion mismatch in guiding thrombolysis for acute ischemic stroke.
  • To assess the safety and efficacy of MRI-based thrombolysis beyond 3 hours from symptom onset.

Summary:

  • Perfusion-diffusion mismatch imaging aids in identifying tissue at risk, potentially salvageable by reperfusion.
  • Non-randomized studies suggest good safety and efficacy for mismatch-based thrombolysis after 3 hours.
  • Reperfusion is a key predictor of clinical response to thrombolysis.

Impact:

  • MRI-based thrombolysis can be considered after 3 hours based on individual benefit:risk assessment in experienced stroke centers.
  • Improved understanding of mismatch concept enhances stroke treatment strategies.
  • Highlights the importance of advanced neuroimaging in acute stroke management.