体感诱发电位监测脊髓缺血再灌注损伤的实验研究

目的探讨脊髓缺血再灌注损伤中体感诱发电位(SEPs)的变化规律及其对神经功能的监测作用。方法26只新西兰大白兔采用肾下腹主动脉阻断45min,建立脊髓缺血再灌注模型。分别于缺血前、缺血5、8、10min及再灌注10、15、30min、1、2、24和48h监测SEP变化。再灌注24和48h进行神经功能评分;再灌注48h进行脊髓病理学观察。结果缺血5min时SEPsP1潜伏期明显延长(P<0.01),P1波幅在缺血8min时明显减小(P<0.01),缺血10min时SEPs波形消失。再灌注后10min时SEPs波形恢复,但P1波幅小于缺血前(P<0.01),P1潜伏期明显延长(P<0.01)。再灌注15min时P1波幅恢复至缺血前(P>0.05)。再灌注30min后各时间点P1潜伏期虽然呈恢复趋势,但仍明显延长(P<0.01);再灌注24和48hP1波幅再次降低小于缺血前(P<0.01)。再灌注24和48h神经功能评分逐渐增加(P<0.01)。再灌注24和48hP1波幅变化与神经功能评分显著相关(r=-0.881和r=-0.925,P<0.01)。再灌注48h可见受损脊髓发生出血、水肿、变性坏死和中性粒细胞浸润。...

Somatosensory-evoked potential monitoring for evaluation of spinal cord ischemia-reperfusion injury in rabbits

Objective To assess the changes of somatosensory evoked potentials (SEPs) during spinal cord ischemia and reperfusion injury and the value of SEP monitoring in evaluating neurological functions in this setting. Methods Spinal cord ischemia-reperfusion injury was induced in 28 rabbits by clamping the infrarenal aorta for 45 min, and the SEPs were monitored before and at 5, 10, and 15 min after ischemia, and at 15, 30, and 60 min and 2, 24 and 48 h after reperfusion. The neurological function score (NFS) of t...