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Human Reproduction, Vol 12, 1545-1549, Copyright © 1997 by Oxford University Press

ARTICLES

Embryo morphology or cleavage stage: how to select the best embryos for transfer after in-vitro fertilization

S Ziebe, K Petersen, S Lindenberg, AG Andersen, A Gabrielsen and AN Andersen
The Fertility Clinic, The Juliane Marie Center, Rigshospitalet, University of Copenhagen, Denmark.

This retrospective study of 1001 in-vitro fertilization (IVF) cycles included a consecutive series of single transfers (n = 341), dual transfers (n = 410) and triple transfers (n = 250) where all the transferred embryos in each cycle were of identical quality score and identical cleavage stage. In our 2 day culture system, transfer of 4- cell embryos resulted in a significantly higher implantation rate and pregnancy rate (23 and 49%) compared with 2-cell embryos (12 and 22%) and 3-cell embryos (7 and 15%). Furthermore, the transfer of 4-cell embryos resulted in a significantly higher pregnancy rate compared with embryos that had cleaved beyond the 4-cell stage (28%). The implantation rate (21%) and pregnancy rate (43%) after transfer of embryos of score 1.0 were significantly higher than after transfer of embryos of score 2.0 (14 and 32% respectively). Transferring embryos of score 2.1 resulted in significantly higher implantation rates (26%) and similar pregnancy rates compared with score 1.0. Transferring embryos of score 2.2-3.0 resulted in a significantly lower implantation rate (5%) and pregnancy rate (15%). A striking finding was that embryos of quality score 2.0 had a significantly lower implantation rate compared with embryos of quality score 1.0 and 2.1 and a significantly lower pregnancy rate compared to embryos of quality score 1.0. We also found a lower implantation rate and pregnancy rate when transferring 3-cell embryos. These findings may indicate periods of increased sensitivity to damage during the cell cycle. In conclusion, these results substantiate the idea of the superiority of 4-cell embryos and demonstrate that minor amounts of fragments in the embryo may not be of any importance. These findings may call for a shift when weighing the two main morphological components (quality score and cleavage stage) in the sense that reaching a 4-cell cleavage stage even with the presence of a minor amount of fragments should be preferred to a 2-cell embryo with no fragments.
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