患者:女,5 2岁。既往体健,因宫颈癌拟在硬膜外麻醉下行子宫广泛切除+盆腔淋巴结清扫术。术前常规检查无异常,硬膜外麻醉取两点法T1 1～1 2 、L2～3分别向头尾方向置管,用药为1.5 %利多卡因和0 .2 5 %丁卡因混合液,两管分别给予试验量后,上管给予首次量。注药5 min后,病人自头颈 Patient: Female, 5 2 years old. Past physical health, due to cervical cancer to be in the epidural anesthesia underwent extensive hysterectomy + pelvic lymph node dissection. Preoperative routine examination without abnormalities, epidural anesthesia to take two-point method T1 1 ~ 1 2, L2 ~ 3, respectively, to the head and tail direction catheterization, medication 1.5% lidocaine and 0.25% tetracaine mixture , Respectively, after two tubes were given the test amount, the first tube to give the amount. 5 minutes after injection, the patient from the neck