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A Novel In Vitro Model of Blast Traumatic Brain Injury
Published on: December 21, 2018
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Comprehensive Characterization of Cerebrovascular Dysfunction in Blast Traumatic Brain Injury Using Photoacoustic
Rui Cao1, Chenchu Zhang1, Vladimir V Mitkin2
11 Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia.
Journal of Neurotrauma
|December 4, 2018
Summary
Blast traumatic brain injury (bTBI) significantly impairs cerebrovascular reactivity, hindering the brain's ability to respond to metabolic demands. This study reveals bTBI's impact on cerebral blood flow regulation and oxygen metabolism.
Area of Science:
- Neuroscience
- Vascular Biology
- Trauma Research
Background:
- Blast traumatic brain injury (bTBI) is a critical concern in military medicine.
- Cerebrovascular dysfunctions following bTBI are not well understood.
- Focus has been on neuronal damage, neglecting vascular impacts.
Purpose of the Study:
- To investigate cerebrovascular hemodynamics and metabolism post-bTBI in a rat model.
- To assess the impact of bTBI on cerebrovascular reactivity (CVR).
- To analyze bTBI-induced changes at the single-vessel level.
Main Methods:
- Utilized photoacoustic microscopy (PAM) for quantitative analysis.
- Measured cerebral blood perfusion, oxygenation, flow, and oxygen extraction.
- Assessed CVR to vasodilatory stimulation post-blast exposure.
Main Results:
- Minimal baseline changes in cerebrovascular function were observed.
- Significant impairment of CVR, including arterial dilation and flow upregulation, was found.
- bTBI abolished the venous sO2 increase during stimulation.
Conclusions:
- bTBI severely compromises CVR, impacting the brain's dynamic response capabilities.
- Impaired CVR may lead to cognitive deficits due to metabolic demand-supply mismatch.
- Compromised CVR increases brain vulnerability to hypoxia and ischemia.
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