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Related Experiment Videos

Initial ischemic event: perfusion-weighted MR imaging and apparent diffusion coefficient for stroke evolution.

Rüdiger J Seitz1, Stefanie Meisel, Patrick Weller

  • 1Department of Neurology, Heinrich-Heine University of Düsseldorf, Moorenstrasse 5, D-40225 Düsseldorf, Germany. seitz@neurologie.uni-duesseldorf.de

Radiology
|October 21, 2005
PubMed
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This summary is machine-generated.

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Perfusion abnormalities on time-to-peak maps predict stroke lesion volume. Diffusion abnormalities do not predict infarct evolution, suggesting complex changes in acute stroke patients.

Area of Science:

  • Neurology
  • Radiology
  • Medical Imaging

Background:

  • Acute ischemic stroke requires accurate prediction of infarct evolution for timely intervention.
  • Magnetic resonance (MR) imaging plays a crucial role in assessing stroke severity and predicting outcomes.

Purpose of the Study:

  • To prospectively evaluate if acute perfusion or diffusion abnormalities on MR imaging predict the evolution of brain infarction.
  • To correlate imaging findings with clinical presentation and cerebrovascular changes.

Main Methods:

  • Sixty-four patients with acute middle cerebral artery infarction underwent MR imaging within 3 hours of symptom onset.
  • Lesion volumetry was performed using time to peak, mean transit time, cerebral blood volume, and apparent diffusion coefficient maps.
  • Infarct lesions were assessed on follow-up T2-weighted MR images, and cerebrovascular changes were determined via MR angiography.

Related Experiment Videos

Main Results:

  • A perfusion delay on time-to-peak maps significantly predicted lesion volume on follow-up T2-weighted images (r = 0.686, P < .001).
  • Diffusion abnormalities did not reliably predict infarct volume, with some patients showing infarct growth and others showing shrinkage.
  • Cerebral artery abnormalities were more prevalent in patients with larger infarcts, correlating with more severe neurologic impairment.

Conclusions:

  • Initial perfusion abnormalities, particularly on time-to-peak maps, indicate hemodynamic compromise in acute stroke.
  • These findings suggest that perfusion imaging is valuable for predicting infarct evolution, while diffusion imaging may be less reliable due to complex infarct changes.
  • The study highlights the importance of assessing collateral circulation and potential multi-arterial involvement in acute stroke management.