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Abstract To explore the correlation between vaginal microecology of pregnant women during the third trimester of pregnancy and their adverse pregnancy outcomes. Methods: The clinical data of 70 pregnant women during the third trimester of pregnancy from January 2019 to May 2020 were selected in this study. The vaginal secretions of these women collected to evaluate their vaginal microecological environment. These women were divided into the women with abnormal vaginal microecology in study group and the women with normal vaginal microecology in control group. The adverse pregnancy outcomes of the women were compared between the two groups. Results: Among these 70 women, there were 22 (31.4%) women with normal vaginal microecology, and 48 (68.6%) women with abnormal vaginal microecology, which included 10 (14.3%) cases with simple abnormal microecology, 14 (20.0%) cases with BV, 9 (12.9%) cases with TV, 7 (10.0%) cases with VVC, and 8 (11.4%) cases with mixed infection. The incidences of premature delivery (29.2%), intrauterine infection (33.3%), premature rupture of membranes (22.9%), low neonatal weight (31.3%), neonatal asphyxia (29.2%), and neonatal infection (25.0%) in the study group were significantly higher than those (4.6%, 0, 0, 0, 4.6%, and 0) in the control group (P<0.05), and there were no significant differences in the incidences of puerperal infection and postpartum hemorrhage of the women between the two groups (P>0.05). The incidences of premature delivery, intrauterine infection, and low neonatal weight of the women with BV, TV, VVC, or mixed infection were significantly higher than those of the women with simple abnormal vaginal microecology (P<0.05), but there were no significant differences in the incidences of premature rupture of membranes, puerperal infection, postpartum hemorrhage, neonatal asphyxia, and neonatal infection between the women with BV, TV, VVC, or mixed infection and the women with simple abnormal vaginal microecology (P>0.05). Conclusion: The rate of the abnormal vaginal microecological environment of the pregnant women during the third trimester of pregnancy is high, which is closely related to their adverse pregnancy outcomes. It is important to pay attention to the vaginal microecological environment of the pregnant women during the third trimester of pregnancy, so as to prevent their adverse pregnancy outcomes.
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