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Abstract To analyze the influence of cesarean section of primiparas when different dilation degrees of uterine mouth during labor on their postpartum pelvic floor muscle function. Methods: The clinical data of women who underwent pelvic floor muscle function examination during postpartum 6-8 weeks from October 2018 to June 2020 were collected. According to the delivery mode, these women were divided into group A (women with vaginal delivery), group B (women with cesarean section before labor), and group C (women with cesarean section after labor). Then according to the dilation degrees of uterine mouth when cesarean section, the women in group C were further divided into group C1 (women with uterine mouth dilation <6cm), group C2 (women with uterine mouth dilation 6-10cm), and group C3 (women in the second labor process). The difference of pelvic floor muscle function of the women was compared among these groups. The influence of cesarean section at different stages of labor on postpartum pelvic floor muscle function was analyzed. Results: There was no significant difference in the incidence of abnormal pelvic floor muscle strength (76.1% vs.77.9%) of the women between group A and group C, but the incidence of abnormal pelvic floor muscle strength of the women in group A and group C was significant higher than that (60.7%) of the women in group B (P＜0.001). There was no significant difference in the composition ratio of abnormal pelvic floor muscle strength type of the women among group A, B, and C (P＞0.05). There were no significant difference in the rates of levator muscle ΔA, ΔC, ΔL, and ε of the women between group A and group C, but which were all significant higher than those of the women in group B (P＜0.001). There was no significant difference in the total incidence of abnormal pelvic floor muscle strength (89.4% vs. 91.4%) between group C2 and group C3, but which of the women in group C2 and group C3 were significant higher than that (69.2%) of the women in group C1 (P＜0.001). There was no significant difference in the composition ratio of abnormal pelvic floor muscle strength type of the women among group C1, C2, and C3 (P＞0.05). There were no significant difference in the rates of levator muscle ΔA, ΔC, ΔL, and ε of the women between group C2 and group C3, but which were all significant higher than those of the women in group C1 (P＜0.001). Maternal age, body mass index, neonatal birth weight, uterine mouth dilation to 6-10cm, cesarean section during the second stage of labor were all the influencing factors of abnormal pelvic floor muscle strength (P＜0.05).Conclusion: The damage to pelvic floor muscle of the primiparas with cesarean section of after labor has the similar to that of the primiparas with vaginal delivery. Cesarean section after uterine mouth dilation over 6cm will aggravate the damage to pelvic floor muscle function.
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