<p><strong>Objective: </strong>This study investigates risk factors, prenatal ultrasonographic characteristics, and pregnancy outcomes in patients with umbilical artery thrombosis (UAT) and umbilical vein thrombosis (UVT).</p><p><strong>Methods: </strong>A retrospective study was conducted at West China Second Hospital, Sichuan University, between April 2019 and April 2024. The umbilical cord thrombosis (UCT) group included women with pathologically confirmed UAT or UVT, whereas the control group consisted of women without UCT who registered and delivered during the same period in our hospital. Maternal clinical data, prenatal ultrasound findings, and pregnancy outcomes were collected and compared between the groups.</p><p><strong>Results: </strong>A total of 110 patients, including 30 patients with UAT, 20 patients with UVT, and 60 controls, were included in the study. Compared with the control group, the UCT group showed significantly greater proportions of umbilical cord torsion, fetal hemodynamic abnormalities, prenatal ultrasound findings, preterm birth, emergency cesarean delivery, intrauterine fetal death (IUFD), low birth weight, and neonatal intensive care unit admission (all P < 0.05). The main hemodynamic abnormalities detected in the UCT group included a decreased systolic/diastolic ratio (S/D), pulsatility index (PI), and resistance index (RI) of the umbilical artery, as well as a decreased PI of the fetal middle cerebral artery (MCA). Among patients with UCT, the prevalence of antiphospholipid antibody syndrome (APS) was significantly greater among those who experienced IUFD than in those with live births (P < 0.05). Compared with the UVT group, more patients in the UAT group had detectable sonographic evidence of thrombosis, an earlier gestational age, and a lower neonatal Apgar score (all P < 0.05). Compared with the control group, the UVT group demonstrated a significantly lower pre-pregnancy body mass index, less gestational weight gain, and a greater proportion of conceptions via assisted reproductive technology (all P < 0.05). In most patients with UCT, the thrombi were predominantly located near the umbilical cord insertion site at the fetal abdominal wall.</p><p><strong>Conclusion: </strong>Our study demonstrated that UCT was extremely unfavorable to the perinatal outcomes. Umbilical cord torsion may be a risk factor for the development of UCT. The risk of IUFD was further increased in cases with UCT that coexisted with APS. UAT was more likely to be detected prenatally via ultrasound than UVT; however, UVT was more frequently observed in pregnant women who exhibited insufficient gestation weight gain or conceived through assisted reproductive technology. During routine ultrasound examination, color Doppler assessment of key anatomical sites, together with close monitoring of umbilical artery and MCA indices, might facilitate the early detection of UCT. Although prenatal diagnosis of UCT was significantly challenging, it rem
{"title":"A retrospective study on risk factors, diagnostic approaches, and pregnancy outcomes in patients with umbilical artery and vein thrombosis.","authors":"Yuxia Wu, Dan Shan, Qiuhe Chen, Yayi Hu","doi":"10.1002/ijgo.70834","DOIUrl":"https://doi.org/10.1002/ijgo.70834","url":null,"abstract":"<p><strong>Objective: </strong>This study investigates risk factors, prenatal ultrasonographic characteristics, and pregnancy outcomes in patients with umbilical artery thrombosis (UAT) and umbilical vein thrombosis (UVT).</p><p><strong>Methods: </strong>A retrospective study was conducted at West China Second Hospital, Sichuan University, between April 2019 and April 2024. The umbilical cord thrombosis (UCT) group included women with pathologically confirmed UAT or UVT, whereas the control group consisted of women without UCT who registered and delivered during the same period in our hospital. Maternal clinical data, prenatal ultrasound findings, and pregnancy outcomes were collected and compared between the groups.</p><p><strong>Results: </strong>A total of 110 patients, including 30 patients with UAT, 20 patients with UVT, and 60 controls, were included in the study. Compared with the control group, the UCT group showed significantly greater proportions of umbilical cord torsion, fetal hemodynamic abnormalities, prenatal ultrasound findings, preterm birth, emergency cesarean delivery, intrauterine fetal death (IUFD), low birth weight, and neonatal intensive care unit admission (all P < 0.05). The main hemodynamic abnormalities detected in the UCT group included a decreased systolic/diastolic ratio (S/D), pulsatility index (PI), and resistance index (RI) of the umbilical artery, as well as a decreased PI of the fetal middle cerebral artery (MCA). Among patients with UCT, the prevalence of antiphospholipid antibody syndrome (APS) was significantly greater among those who experienced IUFD than in those with live births (P < 0.05). Compared with the UVT group, more patients in the UAT group had detectable sonographic evidence of thrombosis, an earlier gestational age, and a lower neonatal Apgar score (all P < 0.05). Compared with the control group, the UVT group demonstrated a significantly lower pre-pregnancy body mass index, less gestational weight gain, and a greater proportion of conceptions via assisted reproductive technology (all P < 0.05). In most patients with UCT, the thrombi were predominantly located near the umbilical cord insertion site at the fetal abdominal wall.</p><p><strong>Conclusion: </strong>Our study demonstrated that UCT was extremely unfavorable to the perinatal outcomes. Umbilical cord torsion may be a risk factor for the development of UCT. The risk of IUFD was further increased in cases with UCT that coexisted with APS. UAT was more likely to be detected prenatally via ultrasound than UVT; however, UVT was more frequently observed in pregnant women who exhibited insufficient gestation weight gain or conceived through assisted reproductive technology. During routine ultrasound examination, color Doppler assessment of key anatomical sites, together with close monitoring of umbilical artery and MCA indices, might facilitate the early detection of UCT. Although prenatal diagnosis of UCT was significantly challenging, it rem","PeriodicalId":14164,"journal":{"name":"International Journal of Gynecology & Obstetrics","volume":" ","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146063508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}