Effect of oocyte vitrification on embryo quality: time-lapse analysis and morphokinetic evaluation Ana Cobo, Ph.D., Aila Coello, Ph.D., Jose Remohí, M.D., Jose Serrano, B.Sc.T., Jose Maria de los Santos, Ph.D., Marcos Meseguer, Ph.D. Fertility and Sterility Volume 108, Issue 3, Pages 491-497.e3 (September 2017) DOI: 10.1016/j.fertnstert.2017.06.024 Copyright © 2017 American Society for Reproductive Medicine Terms and Conditions
Figure 1 Percentage of embryos falling within the optimal ranges proposed for the three variables included in the algorithm proposed by Meseguer et al. (2011): t5 (time to 5 cells), s2 (t4 − t3), and cc2 (t3 − t2), depending on oocyte origin (fresh vs. vitrified). In addition, exclusion criteria variables were included: direct-cleavage embryos (DC1–3), multinucleated embryos in the 4-cell stage (MN4), and embryos with uneven 1st cleavage (UN2). All proportions were significantly different between fresh and vitrified (P<.05). Fertility and Sterility 2017 108, 491-497.e3DOI: (10.1016/j.fertnstert.2017.06.024) Copyright © 2017 American Society for Reproductive Medicine Terms and Conditions
Supplemental Figure 1 Morphokinetic decision tree algorithm used for embryo selection. t5 = time to division to 5 cells; cc2 = 2nd cell cycle, time from division to a 2-blastomere embryo to division to a 3-blastomere embryo (t3 − t2); s2 = 2nd synchrony, duration of the division transition from a 2-blastomere embryo to a 4-blastomere embryo (t4 − t3). The time of all events is expressed as hours after intracytoplasmic sperm injection. MN4 = multinucleated embryo in the 4-cell stage. Fertility and Sterility 2017 108, 491-497.e3DOI: (10.1016/j.fertnstert.2017.06.024) Copyright © 2017 American Society for Reproductive Medicine Terms and Conditions
Supplemental Figure 2 Percentage of implanted embryos (implantation rate) depending on the embryo categories included in the algorithm proposed by Meseguer et al. (2011) and compared between fresh and vitrified oocytes. No statistical differences were observed in the implantation rates in each category depending on oocyte origin (P>.05). Fertility and Sterility 2017 108, 491-497.e3DOI: (10.1016/j.fertnstert.2017.06.024) Copyright © 2017 American Society for Reproductive Medicine Terms and Conditions