RESUMO
Objective:To analyse the risk factors of postpartum hemorrhage in vaginal delivery patients with low-lying placenta.Methods:We retrospectively evaluated the data from January 2014 to December 2015 of 345 cases of vaginal delivery pregnant women with low-lying placenta.According to postpartum hemorrhage,the data were divided into two groups:single factor analysis and multivariate logister regression analysis were used to assess the risk factors.Results:Postpartum hemorrhage in 47 cases,the total rate is 13.6％.Univariate analysis showed that assisted reproductive conception,history of prenatal hemorrhage,placenta from the cervix within the distance ≤ 10 mm,placental adhesions were more prone to postpartum hemorrhage(P ＜ 0.05).Logistic multivariate regression analysis showed that assisted reproductive conception (OR =8.181,95％ CI 3.072-21.791) and placental adhesions(OR=6.543,95％ CI 3.107-13.775) were independent risk factors for postpartum hemorrhage.Conclusions:Systematic prenatal care,carefully transvaginal ultrasound examination before labor and evaluation of these risk factors,may be able to provide a better choice of mode of delivery to low-lying placenta patients and predict postpartum hemorrhage risk,thereby reducing its postpartum hemorrhage rate.
RESUMO
From January 1987 to April 1991, we used the ultrasonography in the diagnosis of placenta previa of 197 cases. The diagosis of placenta previa is made to assess the relationship of the lower margins of the placenta and the internal os. There were total 74 eases of placenta previa (37.6%), 37 cases of (18.8%) partial placenta previa, 46 cases of low-lying placenta (23.4%), and 40 cases of "relative low-lying placenta" (20.2%). The high ratio diagnosis of the total placenta previa was made at 28-36 weeks.(P