Predicting experimental success: a retrospective case-control study using the rat intraluminal thread model of stroke

Area of Science:

• Neuroscience
• Translational Medicine
• Experimental Surgery

Background:

• Preclinical stroke research has a low success rate in translating findings to clinical practice.
• Inaccurate animal models of stroke contribute to this translational gap.
• Transient middle cerebral artery occlusion (tMCAO) is a common model, but its reliability can be compromised by confounding pathologies.

Purpose of the Study:

• To identify predictors of experimental success in tMCAO models.
• To improve the reliability and reproducibility of preclinical stroke research.
• To establish criteria for successful ischemia induction without unintended complications.

Main Methods:

• Monitoring of bilateral cerebral blood flow (CBF), heart rate (HR), and mean arterial pressure (MAP) during tMCAO surgery.
• Analysis of monitoring data from animals with ideal outcomes (MCA-ischemia) versus those with additional pathologies (e.g., hemorrhage).
• Utilizing receiver operating characteristic (ROC) curves and area under the curve (AUC) to assess prognostic performance of various parameters.

Main Results:

• A decrease in contralateral CBF during MCA occlusion indicated unintended pathologies.
• Baseline HR and MAP were significant predictors of experimental success (AUC 0.89).
• Incorporating left and right CBF differences further improved prediction accuracy to AUC 1.00.

Conclusions:

• Peri-interventional monitoring is essential for verifying successful tMCAO experiments.
• Consistent monitoring ensures a more homogeneous and reliable stroke disease model.
• These findings can enhance the translational validity of preclinical stroke research.