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Published on: June 22, 2013
Advanced MRI to assess hippocampal injury after incomplete cerebral ischemia-reperfusion in rats
Lan Fu1, Li-Min Zhang2, Lin-Na Guan1
1Department of Computed Tomography Diagnosis, Cangzhou Central Hospital, Cangzhou, China.
Background And Purpose:
The purpose of this study was to evaluate advanced MRI findings in the bilateral hippocampus CA1 region of rats with hemorrhagic shock reperfusion (HSR) and their correlation with histopathological results. Additionally, this study aimed to identify effective MRI examination methods and detection indexes for assessing HSR.
Methods:
Rats were randomized into the HSR and the Sham groups with 24 rats in each group. MRI examination included diffusion kurtosis imaging (DKI) and 3-dimensional arterial spin labeling (3D-ASL). Apoptosis and pyroptosis were evaluated directly from tissue.
Results:
In the HSR group, cerebral blood flow (CBF) was significantly lower than that of the Sham group, while radial kurtosis (Kr), axial kurtosis (Ka), and mean kurtosis (MK) were all higher. In the HSR group, fractional anisotropy (FA) at 12 and 24 hours and radial diffusivity, axial diffusivity (Da), and mean diffusivity (MD) at 3 and 6 hours were lower than in the Sham group. MD and Da at 24 hours in the HSR group were significantly higher. The apoptosis rate and pyroptosis rate were also enhanced in the HSR group. CBF, FA, MK, Ka, and Kr values in the early stage were strongly correlated with apoptosis rate and pyroptosis rate. The metrics were obtained from DKI and 3D-ASL.
Conclusions:
Advanced MRI metrics from DKI and 3D-ASL, including CBF, FA, Ka, Kr, and MK values, are useful to evaluate abnormal blood perfusion and microstructural changes in the hippocampus CA1 area in the setting of incomplete cerebral ischemia-reperfusion in rats induced by HSR.
Insights
Advanced MRI techniques like DKI and 3D-ASL can detect changes in rat hippocampus after hemorrhagic shock reperfusion. These findings correlate with cell damage, aiding in assessing this condition.
Area of Science:
- Neuroimaging
- Pathology
- Medical Physics
Background:
- Hemorrhagic shock reperfusion (HSR) can lead to brain injury.
- The hippocampus CA1 region is particularly vulnerable to ischemia-reperfusion.
- Assessing HSR-induced changes requires sensitive detection methods.
Purpose of the Study:
- To evaluate advanced MRI findings in the rat hippocampus CA1 region following HSR.
- To correlate MRI results with histopathological outcomes.
- To identify effective MRI methods and detection indexes for HSR assessment.
Main Methods:
- Rats were divided into HSR and Sham groups (24 rats each).
- MRI examinations included diffusion kurtosis imaging (DKI) and 3D arterial spin labeling (3D-ASL).
- Apoptosis and pyroptosis were assessed via tissue analysis.
Main Results:
- HSR rats showed lower cerebral blood flow (CBF) and altered diffusion metrics (FA, MD, Da) compared to Sham.
- Increased kurtosis (Kr, Ka, MK) was observed in HSR rats.
- Elevated apoptosis and pyroptosis rates correlated with early-stage MRI metrics (CBF, FA, MK, Ka, Kr).
Conclusions:
- Advanced MRI metrics (CBF, FA, Ka, Kr, MK) from DKI and 3D-ASL effectively evaluate abnormal perfusion and microstructural changes.
- These MRI metrics are useful for assessing hippocampus CA1 damage in HSR-induced cerebral ischemia-reperfusion in rats.
