Abstract
Purpose
To investigate whether embryo shape is a useful morphologic predictor of developmental competence in IVF cycles.
Methods
Two hundred eighteen day 3 single embryo transfer (SET) cycles and 225 day 3 double embryo transfer (DET) cycles in which only 8-cell non-fragmented embryos with symmetric blastomeres were transferred and in which the developmental fate of each embryo was known were analyzed for IVF outcomes with respect to embryo shape. Embryo shape was quantitatively calculated after digitizing embryo images using MATLAB, where a score of 1.0 represented a perfectly circular embryo.
Results
The SET data did not reveal a significant impact of embryo shape on embryo developmental fate. The DET data revealed a trend toward the best outcomes in cycles where both embryos exhibited “roundness” scores in the highest tertiles (T3) for embryo shape. However only one subgroup (T2/T1—one embryo in the middle shape tertile (T2) and one in the lowest shape tertile (T1)) was associated with significantly lower odds of live-birth as compared to the referent group (T3/T3). When SET and DET data were combined, embryo shape was not found to be a predictor of IVF outcome.
Conclusions
Based on this retrospective analysis, the weak association of day 3 embryo shape with implantation potential suggests that this morphological characteristic is unlikely to be a useful additional marker for embryo selection after cell number, fragmentation, and blastomere symmetry. Further studies are planned to assess applicability of these conclusions to embryos of varying stages and grades.
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References
Racowsky C, Combelles CM, Nureddin A, Pan Y, Finn A, Miles L, et al. Day 3 and day 5 morphological predictors of embryo viability. Reprod Biomed Online. 2003;6:323–31.
Giorgetti C, Terriou P, Auquier P, Hans E, Spach JL, Salzmann J, et al. Embryo score to predict implantation after in-vitro fertilization: based on 957 single embryo transfers. Hum Reprod. 1995;10:2427–31.
Scott L, Alvero R, Leondires M, Miller B. The morphology of human pronuclear embryos is positively related to blastocyst development and implantation. Hum Reprod. 2000;15:2394–403.
Ziebe S, Petersen K, Lindenberg S, Andersen AG, Gabrielsen A, Andersen AN. Embryo morphology or cleavage stage: how to select the best embryos for transfer after in-vitro fertilization. Hum Reprod. 1997;12:1545–9.
Seli E, Botros L, Sakkas D, Burns DH. Noninvasive metabolomic profiling of embryo culture media using proton nuclear magnetic resonance correlates with reproductive potential of embryos in women undergoing in vitro fertilization. Fertil Steril. 2008;90:2183–9.
Mastenbroek S, Twisk M, van der Veen F, Repping S. Preimplantation genetic screening: a systematic review and meta-analysis of RCTs. Hum Reprod Update. 2011;17:454–66.
Hardarson T, Ahlström A, Rogberg L, Botros L, Hillensjö T, Westlander G, et al. Non-invasive metabolomic profiling of Day 2 and 5 embryo culture medium: a prospective randomized trial. Hum Reprod. 2012;27(1):89–96.
Vergouw CG, Kieslinger DC, Kostelijk EH, Botros LL, Schats R, Hompes PG, et al. Day 3 embryo selection by metabolomic profiling of culture medium with near-infrared spectroscopy as an adjunct to morphology: a randomized controlled trial. Hum Reprod. 2012 May 30. [Epub ahead of print]
Reichman DE, Missmer SA, Berry KF, Ginsburg ES, Racowsky C. Effect of time between human chorionic gonadotropin injection and egg retrieval is age dependent. Fertil Steril. 2011;95:1990–5.
Greenland S. Modeling and variable selection in epidemiologic analysis. Am J Public Health. 1989;79(3):340–9.
Kirkegaard K, Agerholm IE, Ingerslev HJ. A randomized clinical trial comparing embryo culture in a conventional incubator with a timer lapse incubator. Assist Reprod Genet. 2012;29(6):565–72.
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The authors can identify no potential conflicts of interest, neither financial nor any other, involved in the writing or publication of this manuscript.
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Embryo shape on day 3 is only weakly associated with implantation potential.
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Kamran, S.C., Reichman, D.E., Missmer, S.A. et al. Day 3 embryo shape as a morphologic selection parameter in in vitro fertilization. J Assist Reprod Genet 29, 1135–1139 (2012). https://doi.org/10.1007/s10815-012-9842-7
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DOI: https://doi.org/10.1007/s10815-012-9842-7