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Recovery of Hypoxic Regions in a Rat Model of Microembolism
Theodosia Georgakopoulou1, Anne-Eva van der Wijk1, Erik N T P Bakker1
1Amsterdam UMC, University of Amsterdam, Biomedical Engineering and Physics, Amsterdam Cardiovascular Sciences, Amsterdam, the Netherlands.
Objectives:
Endovascular treatment (EVT) has become the standard of care for acute ischemic stroke. Despite successful recanalization, a limited subset of patients benefits from the new treatment. Human MRI studies have shown that during removal of the thrombus, a shower of microclots is released from the initial thrombus, possibly causing new ischemic lesions. The aim of the current study is to quantify tissue damage following microembolism.
Materials And Methods:
In a rat model, microembolism was generated by injection of a mixture of polystyrene fluorescent microspheres (15, 25 and 50 µm in diameter). The animals were killed at three time-points: day 1, 3 or 7. AMIRA and IMARIS software was used for 3D reconstruction of brain structure and damage, respectively.
Conclusions:
Microembolism induces ischemia, hypoxia and infarction. Infarcted areas persist, but hypoxic regions recover over time suggesting that repair processes in the brain rescue the regions at risk.
Insights
Microembolism following endovascular treatment (EVT) for stroke causes tissue damage. While infarcts persist, the brain shows repair, rescuing at-risk areas from hypoxia.
Area of Science:
- Neuroscience
- Vascular Biology
- Stroke Research
Background:
- Endovascular treatment (EVT) is standard for acute ischemic stroke.
- A subset of patients has limited benefit from EVT.
- Microclots released during EVT may cause new ischemic lesions.
Purpose of the Study:
- To quantify tissue damage induced by microembolism.
- To investigate the effects of microembolism on brain tissue in a rat model.
Main Methods:
- Microembolism induced using polystyrene microspheres (15, 25, 50 µm) in rats.
- Animals analyzed at 1, 3, and 7 days post-injection.
- 3D reconstruction of brain structure and damage using AMIRA and IMARIS software.
Main Results:
- Microembolism led to ischemia, hypoxia, and infarction.
- Infarcted brain areas were persistent.
- Hypoxic regions demonstrated recovery over time.
Conclusions:
- Microembolism is a significant cause of brain tissue damage after stroke treatment.
- Brain repair mechanisms can rescue hypoxic tissues, suggesting potential for recovery.
