额顶区局限性病变的短潜伏期体感诱发电位研究

Study on somatosensory evoked potentials with shortlatency in patients with fronto-parietal focal lesions

采用额顶部位同时记录的方法,对56例额顶区局限病变测试了短潜伏期体感诱发电位(SLSEP)。额叶病变,以P_(22)—N_(30)异常为主;顶叶病变,以N_(20)—P_(25)异常为主;病变同时涉及额顶二脑叶者,往往P_(22)—N_(30)和N_(20)—P_(25)均有异常。结果表明,P_(22)和N_(30)的神经发生源不同,两者分别起源于中央前、后回。以耳垂为参考电极,同时额顶部记录SLSEP,对中央沟前区或中央沟后区病变,或病变同时涉及两者可作出定位诊断。

The somatosensory evoked potentia-ls with short latency (SLSEPs) weretested on 56 patients with fronto-parie-tal lesions using fronto-parietal recordi-ng method. It was shown that P22-N30 was abnormal obviously in thefrontal lesions, N20-P25 was abnormalin the parietal lesions, both P22-N30and N20-P25 were abnormal in the fro-nto-parietal lesions. The results demons-trate that P22 and N30 originate fromdifferent regions, pre-central and post-central areas respectively, and thatSLSEPs recorded from frontoparietalsites may be used to distinguish pre-central or post- central lesions, or bothlesions.