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目的和方法：实验用不同强度刺激隐神经，配合极化电流阻断技术分别引起Ａ类纤维（Ａｆ）和Ｃ类纤维（Ｃｆ）传入丘脑束旁核的诱发电位，观察静脉注射吗啡（０５ｍｇ／ｋｇ）对Ａ－ＰｆＥＰ和Ｃ－ＰｆＥＰ的影响。结果：Ａ类纤维和Ｃ类纤维均可传入丘脑束旁核引起诱发电位，但两者潜伏期和幅值有明显差异。静脉注射吗啡，可使Ｃ－ＰｆＥＰ幅值明显衰减，潜伏期延长；而Ａ－ＰｆＥＰ的幅值衰减不显著，潜伏期不延长。结论：Ｃ－ＰｆＥＰ与痛关系密切，可作为慢痛反应指标
PURPOSE AND METHODS: The experiment stimulated the saphenous nerve with different intensities and induced the evoked potential of the parafascicular nucleus (A) and the C fiber (Cf) into the paraventricular nucleus of the thalamus separately. The effects of intravenous injection of morphine (0 5mg / kg) on A-PfEP and C-PfEP. Results: Both fibers of type A and fibers of type C could be induced into the para-nucleus of the thalamic nucleus to induce evoked potentials, but the latency and amplitude of both were significantly different. Intravenous injection of morphine, C-PfEP amplitude significantly attenuated, latency; and A-PfEP amplitude attenuation was not significant, the incubation period is not prolonged. Conclusion: C-PfEP is closely related to pain, which can be used as an index of slow pain response