高频重复经颅磁刺激对脑梗死大鼠运动诱发电位皮质潜伏时和中枢运动传导时间的影响

目的:观察不同刺激强度的高频重复经颅磁刺激(rTMS)对脑梗死大鼠运动诱发电位(MEP)的影响。方法:43只大鼠随机分为正常组、模型组、假刺激组、rTMS组(按不同刺激强度分80%MT亚组、100%MT亚组、120%MT亚组)。测定运动阈值(MT)后制备大脑中动脉栓塞模型。模型成功24h后给予20Hz,刺激时间2s,间隔时间28s,总脉冲数为1200的rTMS刺激,连续刺激14d。观察术前、术后1d、治疗7d和治疗14d时双侧中枢传导时间(CMCT)和皮质潜伏时(CL)的变化。结果:①术前各组左右侧CMCT、CL的比较差异均无显著性意义(P>0.05)。②术后1d左侧CMCT、CL较术前和右侧缩短(P<0.01)。③治疗7d时,双侧CMCT、CL各组之间以及各组双侧CMCT、CL比较差异均无显著性意义(P>0.05)。④治疗14d时,100%MT亚组左侧CMCT、CL较正常组和治疗7d时均缩短(P<0.05),双侧CMCT、CL均较术前缩短(左侧P<0.01,右侧P<0.05);80%MT亚组右侧CMCT、CL较术后1d缩短(P<0.05)。结论:本实验结果提示20HzrTMS有助于促进脑梗死大鼠双侧CMCT和CL缩短使双侧大脑达到某种平衡或者代偿,80%MT和100%MT两种强度的rTMS作用可能较大。

Effects of high-frequency repeptitive transcranial magnetic stimulation on cortical latency and central motor conduction time of motor evoked potential of rats with cerebral infarction

Objective:To investigate the effects of high-frequency repetitive transcranial magnetic stimulation(rTMS) with different intensities on motor evoked potential(MEP) of rats with cerebral infarction.Method:A total of 43 rats were randomly divided into blank control group,model control group,sham stimulation control group,rTMS group which was divided into 3 subgroups,80% MT subgroup,100% MT subgroup and 120% MT subgroup.Resting motor threshold(MT) was determined,then the middle cerebral artery occlusion(MCAO) ...