Resumen

VILLANUEVA, Pamela et al. Preimplantational embryo development in in vitro fertilization cycles with oocyte donation and genetic studies. An. Fac. med. [online]. 2017, vol.78, n.3, pp.298-302. ISSN 1025-5583.  http://dx.doi.org/10.15381/anales.v78i3.13762.

Introduction: Preimplantational genetic studies are used to achieve a better implantation rate and live birth, as well as to decrease the abortion rate; these techniques should be evaluated. Objective: To evaluate preimplantational embryo development in in vitro fertilization cycles with oocyte donation and genetic studies.. Design: Retrospective cohort study. Setting: Pranor Laboratory, 2008-2013. Material: In vitro fertilization with oocyte donation (IVF-OD) cycles. Interventions: 2 077 cycles of IVF-OD were evaluated, separated in 3 cohorts: Cohort 1, cycles with embryo biopsy on day 3, by means of an incision in the zona pellucida (ZP), for excision of a blastomer (n = 527); Cohort 2, cycles with a laser incision at day 4 of embryo development, for biopsy of the trophoblast in the blastocyst stage (n = 131) and; cohort 3, FIV-OD cycles without any intervention (n = 1 419). Main outcome measures: Fertilization rate, blastulation rate. Results: There was no difference in the fertilization rate among the three groups studied (75.0%, 74.6% and 75.9% respectively, p = 0.31). Blastulation rate in cohort 1, was 42.5%, whereas, in cohort 3, it was 47% (RR = 1.085, CI = 1.0511.120; p <0.0001). In addition, the rate for cohort 2 was 51.9%, with statistical significance, which prevents from non-blastulation risk compared with cohort 3 (RR = 0.906; IC = 0.851-0.965; p = 0.0017). Conclusions: Preimplantational embryo development would improve blastocyst formation when laser is performed on day 4. Further studies are needed to confirm our results.

Palabras clave : Embryo development; Genetics; In vitro Fertilization; Preimplantational Genetic Study.