Shuang Jing1, Xiaofeng Li1,2, Shuoping Zhang1,2, Fei Gong1,2, Guangxiu Lu1,2, Ge Lin3,4,5. 1. Institute of Reproductive and Stem Cell Engineering, School of Basic Medicine, Central South University, Changsha, China. 2. Key Laboratory of Reproductive and Stem Cell Engineering, National Health and Family Planning Commission, Beijing, China. 3. Institute of Reproductive and Stem Cell Engineering, School of Basic Medicine, Central South University, Changsha, China. linggf@hotmail.com. 4. Key Laboratory of Reproductive and Stem Cell Engineering, National Health and Family Planning Commission, Beijing, China. linggf@hotmail.com. 5. Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China. linggf@hotmail.com.
Abstract
PURPOSE: To determine whether the endometrial thickness (EMT) affects the occurrence of obstetric complications and neonatal outcomes in frozen embryo transfer (FET). METHODS: We conducted a retrospective study that included singleton deliveries (N = 5251) resulting from FET in a single center between August 2013 and March 2016. Obstetric complications and neonatal outcomes were compared among patients with different EMTs, which were measured the day before embryo thawing. The women were divided into three groups based on the EMT: group 1: < 9 mm; group 2: 9-12 mm; group 3: > 12 mm. Multiple logistic regression and subgroup analyses were performed to determine the potential confounding factors. RESULTS: The incidence of placenta previa in groups 1, 2, and 3 was 3.8, 1.0 and 0.5%, respectively, and that of cesarean section was 87.0, 78.3 and 72.0%, respectively (both P < 0.001). The gestational age and birth weight increased from group 1 to group 3 (both P < 0.001). After adjusting for confounders, a thicker EMT was found to be associated with a decreased risk of placenta previa (adjusted odds ratio (aOR) 0.798; 95% confidence interval (95% CI) 0.651-0.979; P = 0.031) and with a decreased risk of cesarean section (aOR 0.926; 95% CI 0.889-0.965; P < 0.001). Regarding the incidence of placenta previa, compared to women in group 3, women in group 1 had an aOR of 6.208 (95% CI 2.169-17.766; P = 0.001), and women in group 2 had an aOR of 1.862 (95% CI 0.851-4.076; P = 0.120). Regarding the incidence of cesarean section, compared to women in group 3, women in group 1 had an aOR of 2.111 (95% CI 1.415-3.455; P < 0.001), and women in group 2 had an aOR of 1.293 (95% CI 1.128-1.481; P < 0.001). Subgroup analyses showed similar results. CONCLUSIONS: Our results demonstrate that a thin endometrial lining is associated with adverse obstetric and neonatal outcomes and might be related to poor placentation.
PURPOSE: To determine whether the endometrial thickness (EMT) affects the occurrence of obstetric complications and neonatal outcomes in frozen embryo transfer (FET). METHODS: We conducted a retrospective study that included singleton deliveries (N = 5251) resulting from FET in a single center between August 2013 and March 2016. Obstetric complications and neonatal outcomes were compared among patients with different EMTs, which were measured the day before embryo thawing. The women were divided into three groups based on the EMT: group 1: < 9 mm; group 2: 9-12 mm; group 3: > 12 mm. Multiple logistic regression and subgroup analyses were performed to determine the potential confounding factors. RESULTS: The incidence of placenta previa in groups 1, 2, and 3 was 3.8, 1.0 and 0.5%, respectively, and that of cesarean section was 87.0, 78.3 and 72.0%, respectively (both P < 0.001). The gestational age and birth weight increased from group 1 to group 3 (both P < 0.001). After adjusting for confounders, a thicker EMT was found to be associated with a decreased risk of placenta previa (adjusted odds ratio (aOR) 0.798; 95% confidence interval (95% CI) 0.651-0.979; P = 0.031) and with a decreased risk of cesarean section (aOR 0.926; 95% CI 0.889-0.965; P < 0.001). Regarding the incidence of placenta previa, compared to women in group 3, women in group 1 had an aOR of 6.208 (95% CI 2.169-17.766; P = 0.001), and women in group 2 had an aOR of 1.862 (95% CI 0.851-4.076; P = 0.120). Regarding the incidence of cesarean section, compared to women in group 3, women in group 1 had an aOR of 2.111 (95% CI 1.415-3.455; P < 0.001), and women in group 2 had an aOR of 1.293 (95% CI 1.128-1.481; P < 0.001). Subgroup analyses showed similar results. CONCLUSIONS: Our results demonstrate that a thin endometrial lining is associated with adverse obstetric and neonatal outcomes and might be related to poor placentation.