A novel rat model of cerebral artery occlusion complicated with prior venous stagnation.

BACKGROUND: To establish a novel rat model of middle cerebral artery occlusion (MCAO) complicated with prior venous stagnation, and to investigate the role of cerebral venous drainage in neural injury after acute cerebral infarction.

NEW METHOD: Eighteen SD rats were randomly divided into two groups: control group and jugular vein ligation group. The left jugular vein ligation was performed to produce the jugular venous stagnation. In the control group, the jugular vein was exposed but not ligated. Cerebral blood flow (CBF) was measured through laser speckle imaging before and after the surgery. At 1 week after the surgery, CBF was again measured and then a left MCAO was performed in both groups. At 24 hours after MCAO, neurological deficit scoring was performed and the infarct volume was measured by 2,3,5-triphenyltetrazolium chloride staining.

RESULTS: Compared with the control group, a significant decrease in the CBF level was observed immediately after the ligation. A moderate recovery in CBF level was observed at 1 week after the ligation. The neurological deficit scores were significantly higher in the ligation group than in the control group at 24 h after the MCAO. Additionally, the volume of cerebral infarction increased significantly in the ligation group compared with that in the control group at the 24 h after MCAO.

COMPARISON WITH EXISTING METHOD(S) AND CONCLUSIONS: The novel rat model of cerebral artery occlusion complicated with long-term unilateral venous stagnation indicates cerebral venous drainage impairment may aggravate behavioral impairment and increase infarct volume after cerebral infarction.