Abstract:Objective To investigate the efficacy of atosiban combined with dydrogesterone in the treatment of threatened preterm labor and its effects on maternal and infant outcomes.Methods The 205 patients with threatened preterm labor admitted to Changzhou Maternal and Child Health Hospital from January 2020 to April 2023 were selected by the method as the prospective randomized study, and were divided into the control group and the experimental group with the random number table method. The control group was given dydrogesterone tablets orally, and the experimental group was additionally given atosiban acetate injection intravenously. The therapeutic efficacy was observed in the two groups after 7 days of treatment. The duration of symptoms, the prolonged duration of pregnancy, serum factors, clinical efficacy, maternal and infant outcomes, and the incidence of adverse drug reactions were compared between the two groups.Results There were 99 cases in the control group and 101 cases in the experimental group. The duration of symptoms in the experimental group was shorter than that in the control group (P < 0.05), and the prolonged duration of pregnancy in the experimental group was longer than that in the control group (P < 0.05). The differences of levels of interleukin-6, interleukin-8, nitric oxide, prostaglandin E2, tissue inhibitor of metalloproteinase-1 and progesterone-induced blocking factor before and after the treatment in the experimental group were higher than those in the control group (P < 0.05). The overall effective rate of the experimental group was higher than that of the control group (P < 0.05). The rate of preterm birth in the experimental group was lower than that in the control group (P < 0.05), while the gestational week, neonatal birth weight and Apgar scores of newborns in the experimental group were higher than those in the control group (P < 0.05). There was no significant difference in the overall incidence of adverse drug reactions between the two groups (P > 0.05).Conclusions In the treatment of threatened preterm labor, atosiban combined with dydrogesterone may prolong the time to delivery and improve maternal and infant outcomes and expressions of serum factors effectively and safely.