The PCEA group was given epidural anesthesia. Puerperants were placed in the left-lateral position. Venous access was established using an 18-indwelling needle; Fetal heart rate and uterine contraction were monitored by fetal heart rate monitoring. Heart rate, blood pressure, and blood oxygen saturation were monitored by electrocardiogram (ECG) monitoring. The puncture point was between L2 and L3. After confirming the puncture was correct, a 5 cm epidural catheter was inserted into the cephalic side. It was then checked to ensure that the catheter was in the epidural space and the anesthesia block plane was below T10. First, 5 mL of 1% lidocaine was given, then observation was conducted for five minutes to determine whether there was a subarachnoid block or anesthetic toxicity. After excluding abnormality by observation, 8 mL of 0.125% ropivacaine and 0.5 μ g/mL sufentanil was injected. After the pain was relieved, the analgesia pump was connected, and 100 mL of 0.125% ropivacaine and 0.5 μ g/mL sufentanil was given. The input rate was set to 10 mL/h, and the added dose was 5 mL. The added dose interval was 15 minutes. An anesthesiologist was responsible for the whole operation process and analgesia. The progress of labor was observed, the fetal heart rate, uterine contraction, blood pressure, heart rate, and VAS before and after analgesia were recorded until the opening of the uterine orifice.

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