Local Brain Ischemia Inducing in Rat by Embolic Model of Stroke

In patients affected with stroke, most ischemic episodes (80-90%) occur due to occlusion of middle cerebral artery (MCA).Some of blood through femoral artery was withdrawn into a PE- 50 catheter and kept for 2 h in room temperature and 22 h at 4°C to allow old clot formation. Then the catheter was advanced 17 mm in the internal carotid artery until its tip was 1 to 2 mm away from MCA origin. 3-5 µl the preformed clot or 5 µl saline (for sham- operated animals) were injected. Behavioral deficits and seizure activities were recorded at 2, 24, and 48 hours after clot injection. Then the rats were decapitated to remove the brains and prepare them for Tetrazoliume chloride (TTC) staining and analyzing.