Suzuki A, Yasui N
Department of Surgical Neurology, Research Institute for Brain and Blood Vessels-Akita, Japan.
J Neurosurg. 1992 May;76(5):867-70. doi: 10.3171/jns.1992.76.5.0867.
Perplexing findings of cortical somatosensory evoked potentials (SEP's) for determining the central sulcus during a craniotomy are reported in a case of brain tumor. On stimulation of the contralateral median nerve in that patient, phase-reversal of SEP waves N1 and P2 was observed not only across the central sulcus but also across the precentral sulcus. In topographic mapping of the N1-P2 amplitude, the sulcus dividing the maximum polarity was the central sulcus; this was confirmed by the cortical stimulation-evoked motor responses. For accurate localization of the central sulcus by cortical SEP's, the distribution of potentials must be analyzed with extensive exposure of the sensorimotor cortex.
在一例脑肿瘤患者中，报告了开颅手术期间用于确定中央沟的皮质体感诱发电位（SEP）的令人困惑的发现。在该患者对侧正中神经刺激时，不仅在中央沟而且在前中央沟都观察到SEP波N1和P2的相位反转。在N1 - P2振幅的地形图中，划分最大极性的沟为中央沟；这通过皮质刺激诱发的运动反应得到证实。为了通过皮质SEP准确定位中央沟，必须在广泛暴露感觉运动皮层的情况下分析电位分布。
