Contribution of rescue in-vitro maturation versus double ovarian stimulation in ovarian stimulation cycles of poor-prognosis women

Research question: Maximizing the number of oocytes and embryos obtained in the shortest possible time is of considerable potential clinical significance for women with poor prognosis. The aim of this study was to develop a clinically applicable strategy to obtain more oocytes and viable embryos in one menstrual cycle for poor-prognosis women. Design: Prospective cohort study of 146 women with poor prognosis who received rescue in-vitro maturation (IVM) (n = 50) or double ovarian stimulation (DuoStim) (n = 96) between December 2015 and February 2018. Outcomes, number of oocytes retrieved and matured, and embryo developmental potential were compared between the two groups. Results: The rates of mature oocytes, available embryos and top-quality embryos from luteal phase stimulation (LPS) of DuoStim were all significantly higher than those derived from the immature oocytes of rescue IVM (P < 0.05). The relative contributions of LPS in the DuoStim group for proportion of mature oocytes, available embryos and topquality embryos were all significantly higher than IVM in the rescue IVM group (P < 0.001). The overall cancellation rate of no oocyte or available embryo significantly decreased from 30.21% to 9.38% (P < 0.001) when DuoStim was carried out, which decreased from 24.00% to 12.00% with no significant difference in the rescue IVM group when immature sibling oocytes were matured in vitro. Conclusion: Rescue IVM and DuoStim can contribute more competent oocytes and viable embryos in the shortest possible time for poor-prognosis women, of which DuoStim may be more efficient.