To investigate the effect of intraspinal analgesia on vaginal delivery of scar uterus and the outcome of mother and child.

221 patients with scar uterus, which included 110 pregnant women receiving intraspinal delivery analgesia and 111 pregnant women without receiving intraspinal delivery analgesia, were retrospectively analyzed in our hospital from January 2017 to June 2020. The general conditions of the subjects were statistically analyzed. The effects of analgesia in spinal canal delivery on the labor process and the outcomes of mother and child during vaginal delivery with scar uterus were compared.

There were no significant differences in age, body mass index (BMI), gestational age, blood loss at birth, neonatal weight and hospitalization time before delivery comparing in the two groups (P>0.05). The first stage of labor in scar uterine analgesia group [(379.35±145.85)min] were significantly statistically longer than those in scar uterine without analgesia group [(334.61±150.65)min] (P=0.012). The second stage of labor in scar uterine analgesia group [(63.57±26.20)min] were significantly longer than those in scar uterine without analgesia group [(54.61±27.32)min] (P=0.002). There were no significant differences in the third stage of labor, perineal lateral resection and vaginal midwifery rates between the two groups (P>0.05). The artificial rupture of fetal membrane rate in scar uterine analgesia group [27 cases(24.55%)] was significantly higher than in scar uterine without analgesia group [14 cases(12.61%)] (P=0.023). The oxytocin usage rate in scar uterine analgesia group [33 cases(30%)] was significantly higher than that in scar uterine without analgesia group [20 cases(18.02%)] (P=0.037). The conversion rate of cesarean section in the group without scar uterus analgesia [14 cases(12.61%)] was significantly higher than that in scar uterus analgesia group [5 cases(4.55%)] (P=0.032). The conversion rate of intrapartum fever in scar uterus analgesia group [18 cases(16.36%)] was significantly higher than that in the group without scar uterus analgesia [7 cases(6.31%)] (P=0.018). There were no significant differences in 1-minute Apgar score, 5-minute Apgar score, neonatal asphyxia rate, perineal Ⅱ degree lacerations, postpartum hemorrhage and postpartum low back pain rate between the two groups (P>0.05).

Intraspinal analgesia can significantly relieve pain and reduce cesarean section rate during vaginal birth after cesarean. The duration of the first and second labor may be prolonged, but it does not affect the outcome of mother and child delivery. It is a safe and effective method for childbirth analgesia.