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Published on: February 10, 2023
Persistent penumbra in a rabbit stroke model: incidence and histologic characteristics
Leah J Hennings1, Rene Flores, Paula K Roberson
1Department of Pathology, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
Stroke Research and Treatment
|July 22, 2011
Summary
Understanding the brain penumbra after stroke is crucial for developing effective treatments. This study found potentially reversible penumbra tissue up to 24 hours post-stroke, suggesting a wider therapeutic window.
Area of Science:
- Neuroscience
- Cerebrovascular Research
- Translational Medicine
Background:
- The penumbra, or area of potentially salvageable brain tissue, is critical in determining stroke treatment efficacy.
- Animal models are essential for understanding penumbra dynamics and developing therapies that translate to human clinical applications.
Purpose of the Study:
- To investigate the duration and extent of potentially reversible penumbra in a rabbit model of embolic stroke.
- To evaluate the impact of microbubble and ultrasound treatment on penumbra in stroke models.
Main Methods:
- New Zealand white rabbits underwent embolic stroke using aged clot or microspheres.
- Treatment group received 3 μm microbubbles plus ultrasound.
- Infarct volume was assessed using triphenyltetrazolium chloride staining.
- Penumbra was visualized via pimonidazole immunostaining.
Main Results:
- Potentially reversible penumbra was observed in 14.3% of rabbits at 4 hours and 15.7% at 24 hours post-stroke.
- This penumbra constituted up to 35% of the total brain tissue lost.
- Microbubble and ultrasound treatment was applied to assess its effect on penumbra.
Conclusions:
- A significant amount of potentially salvageable brain tissue (penumbra) exists for up to 24 hours after embolic stroke.
- These findings suggest that interventions aimed at salvaging penumbra may benefit a substantial patient population even at later time points.
