Obstetric Outcomes in Frozen Embryo Transfer Cycles

All demographic data regarding FET cycles were collected from our fertility center’s EMRs. The obstetric and neonatal complications were obtained from the EMR system in the Department of Obstetrics of our hospital. Live birth was defined as a fetus born alive after 28 weeks of pregnancy. The primary aim was to examine obstetric outcomes, specifically the incidence of gestational hypertension. The four categories of HDP were preeclampsia, gestational hypertension, superimposed preeclampsia, and chronic hypertension. Gestational hypertension was defined as hypertension after 20 weeks of gestational age without proteinuria. Additional obstetric outcomes that were examined included gestational diabetes, premature rupture of membranes (PROM, beyond 37 weeks of gestation and prior to the onset of labor), preterm premature rupture of membranes (PPROM, rupture of membranes prior to 37 weeks of gestation), placenta previa, placenta accreta, abnormal umbilical cord, polyhydramnios, oligohydramnios, postpartum hemorrhage (estimated blood loss ≥ 500 mL in a vaginal delivery or ≥ 1000 mL in a cesarean delivery), and cesarean delivery. The spectrum of abnormal umbilical cord includes the following types: presentation of umbilical cord, torsion of cord, excessively long cord, true knot, and abnormal insertion (e.g., vasa previa, battledore placenta, and velamentous insertion).