Association of Vasa Previa at Delivery With a History of Second-Trimester Placenta Previa

Velamentous cord insertion into the lower third of the uterus is associated with intrapartum fetal heart rate abnormalities

“…Previous studies have suggested that a low-lying placenta in the mid trimester might be a risk factor for vasa previa 18 -21 . Recent studies have reported that more than 60% of cases of vasa previa are associated with a low-lying placenta or placenta previa in the second trimester 20,21 . Our case of vasa previa was prenatally diagnosed during midtrimester screening of the CI and an elective Cesarean section was performed; thus, we propose that sonographic evaluation could reduce the mortality from this condition.…”

Prenatal diagnosis and management of vasa previa in twin pregnancies: a case series and systematic review

“…We found data on 56 cases of VP diagnosed prenatally in twin pregnancies, confirmed at birth and included in 3 case report series, 25-27 9 retrospective cohort studies 6,17,28-34 and 1 retrospective case-control study 35 (Table 2). The incidence of twin pregnancies diagnosed with VP on ultrasound during pregnancy for which ultrasound data and post-natal confirmation was available in the cohort and case-control studies was 11.0% (48 cases of twins for 438 pregnancies diagnosed with VP).…”

Fetal heart rate patterns of pregnancies with vasa previa and velamentous cord insertion

“…The prevalence of vasa previa is 1 in 2500 deliveries with risk factors including use of assisted reproductive technologies [2][3][4]10], placenta previa, bilobed or succenturinate lobe and multiple gestations [4][5][6][7][8][9].…”