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Comparison of perinatal outcomes following fresh and frozen‐thawed blastocyst transfer
Author(s) -
Pereira Nigel,
Petrini Allison C.,
Lekovich Jovana P.,
Schattman Glenn L.,
Rosenwaks Zev
Publication year - 2016
Publication title -
international journal of gynecology and obstetrics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 97
eISSN - 1879-3479
pISSN - 0020-7292
DOI - 10.1016/j.ijgo.2016.04.007
Subject(s) - medicine , blastocyst transfer , obstetrics , live birth , pregnancy , embryo transfer , singleton , gynecology , blastocyst , abortion , retrospective cohort study , birth weight , low birth weight , embryo , surgery , biology , genetics , embryogenesis , microbiology and biotechnology
Objective To investigate the effect of ovarian stimulation on endometrial receptivity by comparing singleton pregnancy and perinatal outcomes following fresh or frozen‐thawed blastocyst transfers. Methods A retrospective cohort study enrolled patients undergoing fresh or frozen‐thawed blastocyst transfers that resulted in live deliveries between January 1, 2010 and September 30, 2013 at a single academic center. Implantation, clinical pregnancy, spontaneous abortion, and live delivery rates were calculated. The incidence of term delivery, preterm delivery, low birth weight, term low birth weight, and very low birth weight were also recorded. To detect a 10% difference in the implantation rate, a minimum sample size of at least 415 transfer cycles in each group was estimated. Results The study included data from 918 fresh and 1273 frozen‐thawed cycles. Patients in both groups were of similar age and there was no difference in the grading of blastocysts. No differences were observed in the implantation (37.3% vs 37.7%), clinical pregnancy (50.2% vs 49.4%), spontaneous abortion (7.3% vs 9.3%), and live delivery (42.9% vs 40.6%) rates of the two groups. A sub‐analysis of all live singleton and twin deliveries revealed no difference in perinatal outcomes between the two techniques. Conclusions The present study demonstrated equivalent singleton pregnancy and perinatal outcomes when comparing frozen‐thawed and fresh blastocyst transfer procedures.