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Diffusion- and perfusion-weighted MRI response to thrombolysis in stroke
Mark W Parsons1, P Alan Barber, Jonathon Chalk
1Royal Melbourne Hospital Echoplanar Imaging Stroke Study Group, Melbourne, Australia.
Annals of Neurology
|January 10, 2002
Summary
Thrombolysis in acute stroke patients with perfusion-weighted imaging-diffusion-weighted imaging mismatch improves reperfusion and reduces infarct expansion. This leads to better clinical outcomes, highlighting the role of advanced MRI in guiding treatment.
Area of Science:
- Neurology
- Radiology
- Cardiovascular System and Hematology
Background:
- Diffusion- and perfusion-weighted MRI are crucial for understanding acute brain ischemia.
- Early assessment of ischemic stroke guides therapeutic interventions.
Purpose of the Study:
- To evaluate the impact of thrombolysis on ischemic lesion evolution and clinical outcomes in sub-6-hour stroke patients.
- To assess the role of perfusion-weighted imaging-diffusion-weighted imaging mismatch in predicting treatment response.
Main Methods:
- Prospective study of 19 sub-6-hour stroke patients receiving thrombolysis, with serial diffusion- and perfusion-weighted MRI.
- Comparison with a historical control group of 21 ischemic stroke patients.
- Analysis of perfusion-weighted imaging-diffusion-weighted imaging mismatch, recanalization, reperfusion, infarct expansion, and clinical outcomes (NIHSS).
Main Results:
- Perfusion-weighted imaging-diffusion-weighted imaging mismatch was common in both thrombolysis and control groups.
- Thrombolysis in mismatch patients led to higher recanalization (81% vs 47%) and reperfusion rates.
- Thrombolysis significantly reduced infarct expansion (14cm³ vs 56cm³) and improved NIHSS scores.
Conclusions:
- Thrombolysis alters the natural evolution of acute perfusion-weighted imaging-diffusion-weighted imaging mismatch tissue, improving stroke outcomes.
- Diffusion- and perfusion-weighted imaging are valuable tools for selecting and monitoring patients for thrombolytic therapy.
- Early reperfusion and reduced infarct progression contribute to better functional recovery in treated patients.