摘要
本实验采用缺血法阻断纤维传导,分析刺激正中神经引起的体感诱发电位(SEPs)痛成份。结果表明:强痛刺激下,于200毫秒处出现一正向波(平均峰潜伏期213±16毫秒),随后300毫秒处接一负向波(296±15毫秒),特称此复合电位为 P200-N300。阻断血流至触觉消失后,SEPs 的其它成份消失,而此成份只要痛觉存在即被保留,但潜伏期略延长(234±14ms)。当痛觉消失后,此成份也消失。血行恢复后的记录与阻断相同。此成份在中央沟前后(C_3′,F_3)的分布基本相似。可以认为 P200-N300是正中神经 SEPs 的痛成份。
The pain components of somatosensory evoked potentials (SEPs) of induced bymedian nerve stimulation were studied with the way of blocking bloodstreamof arm in 12 normal adults.The SEPs following the painful stimuli (0.1msec.square wave pulse) of the right wrist were recorded from the left parietal(C3′) and frontal (F3) scalp with earlob reference electrode.The pressure of40 mmHg above the arterial pressure was given to the right upper arm bysphygmomanometer.The resnlt showed that the P200-N300 components (latency234±13 msec.and 308±23 msec.) of the SEPs persisted and the others disapp-eared when tactile sensation disappeared but pain existed.The morphology ofP200-N300 from F3 was same to that from C3′.It suggested the P200-N300were the pain potentials of median nerve SEPs.
出处
《针刺研究》
CAS
CSCD
1993年第1期21-23,共3页
Acupuncture Research
