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为了评估术前预防性硬膜外注射吗啡对术后镇痛的影响，选择50例ASAⅡ~Ⅲ级重度妊高征患者随机分成研究组与对照组，每组各25例。研究组于麻醉诱导后，切皮前往硬外管注入含2mg吗啡的生理盐水5ml，对照组则单独注入生理盐水5ml。结果表明：研究组的术后镇痛效果明显优于对照组，术后血压和术后镇痛药用量均明显低于对照组（p＜0．05％）。
To assess the effect of preoperative prophylactic epidural morphine on postoperative analgesia, 50 patients with ASA grade Ⅱ ~ Ⅲ severe PIH were randomly divided into study group and control group, with 25 cases in each group. After induction of anesthesia, the study group was injected with 5 ml normal saline containing 2 mg of morphine into the hard outer skin and 5 ml normal saline into the control group. The results showed that the postoperative analgesic effect of the study group was significantly better than that of the control group. The postoperative blood pressure and postoperative analgesic dosage were significantly lower than those of the control group (p <0.05%).