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Related Experiment Videos

Multimodal MR examination in acute ischemic stroke.

D M Mezzapesa1, M Petruzzellis, V Lucivero

  • 1Department of Neurological and Psychiatric Sciences, University of Bari, Italy.

Neuroradiology
|March 2, 2006
PubMed
Summary

Multimodal magnetic resonance (MR) imaging, including diffusion-weighted imaging (DWI) and perfusion imaging (PI), did not predict stroke progression. However, MR angiography (MRA) alone showed predictive value for lesion evolution in acute ischemic stroke.

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Area of Science:

  • Neuroradiology
  • Neuroimaging
  • Stroke Imaging

Background:

  • Combined diffusion-weighted imaging (DWI) and perfusion imaging (PI) are used to assess acute ischemic stroke.
  • These techniques aim to differentiate reversible from irreversible brain tissue damage.

Purpose of the Study:

  • To evaluate the prognostic value of multiparametric magnetic resonance (MR) imaging in acute ischemic stroke.
  • To determine if DWI, PI (mean transit time - MTT), and MR angiography (MRA) can predict lesion growth and final infarct volume.

Main Methods:

  • 20 acute ischemic stroke patients within 12 hours of onset underwent multiparametric MR: DWI, MTT (PI), MRA.
  • Follow-up T2-weighted and FLAIR MRI at day 7 assessed final infarct volume.
  • Analysis included lesion growth, MTT abnormalities, apparent diffusion coefficient (ADC) values, and MRA findings.

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Main Results:

  • Acute DWI lesions did not predict lesion growth or final infarct size.
  • ADC values in the ischemic penumbra could not predict tissue at risk.
  • DWI-PI mismatch did not predict lesion growth; PI overestimated tissue at risk.
  • Proximal middle cerebral artery occlusion correlated with larger initial and final infarct volumes.
  • MRA findings were predictive of lesion volumetric evolution.

Conclusions:

  • A multimodal MR approach combining DWI and PI lacks prognostic value for lesion evolution in early ischemic stroke.
  • MRA alone provided predictive information regarding infarct progression.
  • Current multiparametric MR techniques may not reliably differentiate reversible from irreversible brain tissue damage in acute stroke.