椎板外冲击对脊髓血流影响的实验研究

目的应用一种闭合性脊髓损伤模型,通过不同强度冲击力作用于椎板,研究这种间接性冲击伤对脊髓的影响,并探讨血管机制在脊髓损伤中的作用。方法选用雄性SD大鼠120只,随机分为四组,每组30只,A组为假手术对照组,B、C、D、三组分别给予10、15、20N的椎板外冲击负荷,在相应的时间点进行心率、血压及脊髓血流测量观察。结果各组在各个时段的血压和心率无明显变化。C、D组血流表现为规律性的变化。结论椎板外冲击负荷能改变脊髓微循环血流,从而对脊髓产生影响;其对脊髓灰质微循环血流的改变更明显。

An experimental study of the influence of impact to lamina on spinal cord blood flow

Objective To study the influences of impact of different loads to lamina on spinal cord with a closed spinal cord injury model and to explore the mechanisms of blood vessels in spinal cord injury. Methods 120 normal male SD rats were randomized into 4 groups, with 30 in each. Group A served as the control group which received no impact. In Groups B, C and D,impacts of 10, 15 and 20 N were given to lamina respectively. The blood flow in the spinal cord central gray matter and the dorsal white matter, the blood pressure and the heart rate were observed at different experimental time points. Results No obvious change was observed in the blood pressure and heart rate in every group at different time points. The spinal cord blood flow (SCBF) in Groups C and D varied in a regular pattern. Conclusions The impact load to lamina can affect the spinal cord mainly by altering the spinal cord microcirculation. The influence is the most obvious on the blood flow of microcirculation of the gray matter.