1～14岁正常儿童胫后神经体感诱发电位正常值及其特点

目的：探讨正常儿童胫后神经（PTN）体感诱发电位（SEP）的特点及正常值。方法：对121名正常儿童进行PTN—SEP检测，分析各波的特点及各波参数随年龄变化规律。结果：PTN—SEP随年龄增长，波幅增高，使波容易辨认，波幅在个体问变异较大。左右双侧对应波的潜伏期（PL）和峰间期（IPL）比较差异无显著意义（P〉0．05），各组男女间PL和IPL无性别差异（P〉0．05）。外周神经电位的腰髓电位（LP）、马尾电位（cE）、胭窝电位（PF）等3个波的潜伏期随年龄增长PI。延长，而P40和N45等皮层电位的PL在8岁前变化则不明显（相邻组间P〉0．05），8岁后延长明显。PF-T12的IPL也随年龄增长而延长（相邻组间P〈0．05）；而T12-P40IPL3岁组较1岁组延长，但差异不明显，以后随年龄增长而缩短，6岁组达成人值。结论：儿童PTN—SEP的正常值按年龄组划分是完全必要的。由于各波PL受身长的影响大，因此绝对PL不宜作为PTN—SEP的异常标准。PTNSEP是评价小儿躯体感觉通路、脊髓、脑干和大脑功能的客观指标，具有较大的临床实用价值。

Normal value and characters of posterior tibial nerve somatosensory evoked potentials in normal children aged 1 to 14 years

Objective：To analyze the character of normal children＇s posterior tibial nerves（PTN） somatosensory evoked potentials（SEP）and find out the normal value in chidren of different ages. Meth- ods：The parameters u{ PTN -SEP waves in 121 normal children were recorded and the character of the waves and the changing rule in different ages were analyzed. Results： PTN-SEP changed with the in- crease of age, the wave amplitude increased as the age increased, and variated in different persons. There was no difference in both sides of waves potential latency（H.） and inter-peaks latency（IPL）（P〉0.05）, and no difference in children of both sex at the same age（P2〉0. 05）. Potential latency of poplileal fossa （PF） ,cauda equine（CE） and lumbosaeral potential（LP） waves increased with the increase of age. PL of P40 and N45 waves did not change a lot before 8 years, but prolonged after 8 years. PF-T12 IPL in- creased with the increase of age （P〈0.05） ; T12-P40 IPL was longer in 3-year group than 1-year group, but the varience was not significant. After 3-years T12-P40 IPL was shortened with the increase of age and adult value at the age of 6 years. Conclusion：Normal values of children＇s PTN-SEP depend on age. Since stature obvously affect upon PL, absolute PL should not be considered as the criterion of abnormal- ity. PTN-SEP is an impersonal method to evaluate the function of children＇s somatosensory pathway, spinal cord, brain stem and cerebrum.