Type of chromosome abnormality affects embryo morphology dynamics

Del Carmen Nogales M, Bronet F, Basile N, Martinez E M, Linan A, Rodrigo L, Meseguer M,
Fertil Steril. Jan. 2017 doi: 10.1016/j.fertnstert.2016.09.019
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OBJECTIVE: To study the differences in the cleavage time between types of embryo chromosomal abnormalities and elaborate algorithm to exclude aneuploid embryos according to the likelihood to be euploid. DESIGN: Retrospective cohort study. SETTING: University affiliated private center. PATIENT(S): Preimplantational genetic screening patients (n = 112) including cases of advanced maternal age, repeated implantation failure, and recurrent miscarriage. A total of 485 embryos were analyzed. INTERVENTION(S): None. MAIN OUTCOME MEASURE(S): All biopsied embryos were cultured in an incubator with time-lapse technology, cleavage timing from insemination to day 3 and all kinetic parameters that have been described in previous studies by our group. RESULT(S): Logistic regression analysis were used to identify morphokinetic parameters and some were strongly associated with complex aneuploid embryos; t3 (odds ratio = 0.590, 95% confidence interval 0.359-0.971) and t5-t2 (odds ratio = 0.151, 95% confidence interval 0.082-0.278). CONCLUSION(S): Embryo morphokinetics are affected by chromosome aneuploidy and further analysis of the chromosome content reveals higher differences when the complexity in the chromosome disorders is increased. The use of time-lapse monitoring, although not able to detect an abnormal embryo, may be potentially useful to discard those embryos with high risk of complex chromosomal abnormalities.