Freeze-all embryo strategy in poor ovarian responders undergoing ovarian stimulation for in vitro fertilization

AbstractThis retrospective study determined the efficacy of the ‘freeze-all’ embryo strategy in poor ovarian responders undergoing ovarian stimulation for in vitro fertilization (IVF). A total of 559 poor responders who met Bologna criteria between January 2012 and December 2014 were included in this study: 256 in the fresh embryo transfer group and 303 in the freeze-all group. Vitrification and warming of day 3 embryos were performed using the Cryotop method. The poor responders treated with fresh embryo transfer and those treated with freeze-all strategy showed similar live birth rates per cycle (12.1% vs. 16.2%, p = .172) and per transfer (15.9% vs. 20.9%, p = .182). Multivariate logistic regression analysis showed that maternal age at retrieval (odds ratio, 0.919; 95% confidence interval, 0.865–0.977; p = .006) and number of good-quality embryos transferred (odds ratio, 1.953; 95% confidence interval, 1.346–2.835; p < .001) were significantly associated with the live birth rate. Freeze-all cycle is an...