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Updated: May 4, 2026
Optimization of the Longa Middle Cerebral Artery Occlusion Method for Complete Reperfusion
Published on: November 22, 2024
Patients with single distal MCA perfusion lesions have a high rate of good outcome with or without reperfusion
Robin Lemmens1, Søren Christensen, Matus Straka
1Stanford University, Stanford, CA, USA.
Background:
Reperfusion is associated with good functional outcome after stroke. However, minimal data are available regarding the effect of reperfusion on clinical outcome and infarct growth in patients with distal MCA branch occlusions.
Aim:
The aim of this study was to evaluate this association and to determine the impact of the perfusion-diffusion mismatch.
Methods:
Individual patient data from three stroke studies (EPITHET, DEFUSE and DEFUSE 2) with baseline MRI profiles and reperfusion status were pooled. Patients were included if they had a single cortical perfusion lesion on their baseline MRI that was consistent with a distal MCA branch occlusion. Good functional outcome was defined as a score of 0-2 on the modified Rankin Scale at day 90 and infarct growth was defined as change in lesion volume between the baseline DWI and the final T2/FLAIR.
Results:
Thirty patients met inclusion criteria. Eighteen (60%) had a good functional outcome and twenty (67%) had reperfusion. Reperfusion was not associated with good functional outcome in the overall cohort (OR: 1·0, 95% CI 0·2-4·7) and also not in the subset of patients with a PWI-DWI mismatch (n = 17; OR: 0·7, 95% CI 0·1-5·5). Median infarct growth was modest and not significantly different between patients with (0 ml) and without reperfusion (6 ml); P = 0·2.
Conclusions:
The overall high rate of good outcomes in patients with distal MCA perfusion lesions might obscure a potential benefit from reperfusion in this population. A larger pooled analysis evaluating the effect of reperfusion in patients with distal MCA branch occlusions is warranted as confirmation of our results could have implications for the design of future stroke trials.
Insights
Reperfusion did not significantly improve outcomes or limit infarct growth in patients with distal middle cerebral artery (MCA) branch occlusions. Further research is needed to confirm these findings and inform future stroke trial designs.
Area of Science:
- Neurology
- Stroke Research
- Medical Imaging
Background:
- Reperfusion therapy is crucial for good functional outcomes in stroke patients.
- Limited data exist on reperfusion's effect on clinical outcomes and infarct growth in distal middle cerebral artery (MCA) branch occlusions.
Purpose of the Study:
- To evaluate the association between reperfusion and clinical outcomes in distal MCA branch occlusions.
- To determine the impact of perfusion-diffusion mismatch on outcomes in this patient group.
Main Methods:
- Pooled individual patient data from three stroke studies (EPITHET, DEFUSE, DEFUSE 2).
- Included patients with single cortical perfusion lesions consistent with distal MCA branch occlusion on baseline MRI.
- Assessed good functional outcome (modified Rankin Scale 0-2 at 90 days) and infarct growth (change in lesion volume on DWI and T2/FLAIR].
Main Results:
- Thirty patients met inclusion criteria; 60% achieved good functional outcome, and 67% received reperfusion.
- Reperfusion was not associated with good functional outcome overall (OR: 1.0) or in the perfusion-diffusion mismatch subset (OR: 0.7).
- Median infarct growth was modest and similar between reperfused and non-reperfused groups (0 ml vs. 6 ml, P=0.2).
Conclusions:
- High rates of good outcomes in distal MCA perfusion lesions may mask reperfusion benefits.
- Larger pooled analyses are warranted to confirm these findings and guide future stroke trial design.
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