As shown in Supplementary Figure 1, a low-frequency nerve and muscle stimulator was used in the TEAS group. After the uterine orifice opened to 3 cm, the patient was placed in the standing position or lateral position, and the application area was disinfected with 75% alcohol. Six electrodes were applied to Hegu (between the first and second phalanges of the hand), Neiguan (2 cun above the transverse line of the palmar wrist of the forearm, between the palmaris longus tendon and the flexor carpi radialis tendon), Jiaji (between T10–L1 of the spine, 0.5 cun beside the posterior midline), and Cili (between the posterior superior iliac spine and the posterior median line, opposite the second sacral posterior foramen). With the spine as the longitudinal axis, and gluteal fissure as the top, a horizontal line was drawn, and the first group of electrodes was placed for the stimulation of Ciliao acupoints. The second group of electrodes was placed at the horizontal line for the stimulation of Jiaji acupoints. At the same time, the wireless fetal heart rate monitoring probe (fetal heart rate and uterine contraction) was placed on the pregnant women’s abdomens for fetal heart rate monitoring. The frequency was one 2Hz/100Hz dilatational wave alternation per three seconds, and the current intensity was 15–50 mA. There are two modes. One is to slowly increase the output of current analgesia intensity manually and adjust the analgesic intensity according to the degree of pain. The other is the automatic adjustment function in which the output of analgesia intensity automatically adjusts with the strength of uterine pressure on the basic intensity value (15 mA). 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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