A retrospective study of perinatal short-term outcomes in pregnancy after fresh and frozen-thawed embryo transfer

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  • 新鮮胚ならびに凍結融解胚移植後妊娠における周産期短期アウトカムの後方視的研究

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Frozen-thawed embryo transfers (ET) have been reported to increase the risk of placenta accreta and postpartum hemorrhage compared with fresh ET. We compared the short-term perinatal outcome after frozen-thawed ET with that after fresh ET in our hospital. We reviewed reproductive and obstetric clinical information from medical records of patients who became pregnant after ET between March 2014 and December 2018 and delivered at our hospital, excluding preterm and multiple pregnancy. We used nonparametric analysis for statistical analysis. The number of the cases was eight in the fresh ET group, and 37 in the frozen-thawed ET group during hormonal replacement cycles. Placenta accreta and hypertensive disorders of pregnancy were not observed in the fresh ET group, while they were seen in 7 and 11 cases in the frozen-thawed ET group, respectively. The bleeding amount during delivery was significantly larger in the frozen-thawed ET group (median 880mL) than in the fresh ET group (median 450mL), partly due to an increase in the number of patients with placenta accreta in the former group. Neonatal birth weight was higher in the frozen-thawed ET group, when excluding the multiparous cases. Postpartum hemorrhage due to placenta accreta and hypertensive disorders of pregnancy may occur in patients who become pregnant after frozen-thawed ET.

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