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Updated: Aug 15, 2026
Optimized System for Cerebral Perfusion Monitoring in the Rat Stroke Model of Intraluminal Middle Cerebral Artery Occlusion
Published on: February 17, 2013
Does a relative perfusion measure predict cerebral infarct size?
Tobias Engelhorn1, Arnd Doerfler, Michael Forsting
1Department of Neuroradiology, University Hospital, Erlangen, Germany.
Background And Purpose:
MR perfusion-weighted imaging (PWI) has been extensively used to quantify cerebral perfusion deficits after the onset of focal ischemia. The present study tested whether a relative measure of cerebral blood flow such as is obtained with PWI is sufficient to predict irreversible tissue damage following focal cerebral ischemia and reperfusion in the rat suture model.
Methods:
In rats, the middle cerebral artery was occluded (MCAO) for 1 hour followed by 1-hour reperfusion. Microspheres labeled with different tracers were injected into the left ventricle to permit measurement of blood flow at different time points: before MCAO, 30 minutes post-MCAO and 30 minutes postreperfusion. Absolute cerebral blood flow (CBF) was determined and relative CBF was calculated by comparing absolute CBF at each time point to baseline values before MCAO (relative CBF(B)) or to corresponding contralateral areas in the noninfarcted hemisphere (relative CBF(C)). Infarct size was assessed by 2,3,5-triphenyltetrazolium chloride staining.
Results:
Absolute CBF in vital tissue was 0.69 +/- 0.07 mL/g/min. In partially and completely necrotic tissue, absolute CBF was 0.39 +/- 0.05 mL/g/min and 0.30 +/- 0.09 mL/g/min, respectively. Although there was a close inverse correlation between infarct volume and absolute CBF (r = 0.79), the correlations between infarct volume and relative CBF(C) were poor (r = 0.21).
Conclusion:
The present study revealed that absolute CBF is superior to relative CBF in predicting irreversible tissue damage following ischemia and reperfusion.
Insights
Absolute cerebral blood flow (CBF) measurements are superior to relative CBF for predicting irreversible tissue damage after focal cerebral ischemia and reperfusion. This finding is crucial for understanding stroke outcomes.
Area of Science:
- Neuroscience
- Medical Imaging
- Stroke Research
Background:
- MR perfusion-weighted imaging (PWI) quantifies cerebral perfusion deficits post-ischemia.
- Predicting irreversible tissue damage is critical in focal cerebral ischemia and reperfusion.
Purpose of the Study:
- To determine if relative cerebral blood flow (CBF) from PWI is sufficient to predict irreversible tissue damage.
- To compare the predictive value of absolute CBF versus relative CBF in a rat stroke model.
Main Methods:
- Middle cerebral artery occlusion (MCAO) for 1 hour followed by 1-hour reperfusion in rats.
- Microsphere injections to measure absolute CBF at various time points.
- Calculation of relative CBF (relative CBF(B) and relative CBF(C)) and infarct size assessment.
Main Results:
- A strong inverse correlation was found between infarct volume and absolute CBF (r = 0.79).
- Correlations between infarct volume and relative CBF(C) were poor (r = 0.21).
- Absolute CBF values differed significantly between vital, partially necrotic, and completely necrotic tissues.
Conclusions:
- Absolute CBF measurements are more effective than relative CBF in predicting irreversible tissue damage after ischemia and reperfusion.
- This study highlights the importance of absolute CBF quantification in stroke research.
