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Characterization of a recurrent poor-quality embryo morphology phenotype and zygote transfer as a rescue strategy.
MedLine Citation:
PMID:  22377150     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Some patients in IVF programmes repeatedly display an abnormal embryonic development characterized as soon as day 2 post fertilization by a high rate (>60%) of highly fragmented embryos (⩾40% of cytoplasmic fragments) leading to recurrent IVF failures. This study postulated that, for various maternal reasons, some embryos were unable to withstand the in-vitro environment and an early pronucleate-stage transfer was proposed to these couples. Fifty-three patients with recurrent IVF failures (a mean of 2.8±1.0 previous attempts) characterized by low embryonic quality (a mean of 62.7% of the embryos with extended fragmentation) were included this transfer protocol. As in previous cycles, the mean number of oocytes retrieved and the fertilization rate were normal. The mean number of zygotes per transfer was 2.24. Fourteen clinical pregnancies were obtained, representing a pregnancy rate and a delivery rate per oocyte retrieval of 26.4% and 18.9%, respectively. Recurrent heavy and early embryo fragmentation in vitro characterizes around 3% of IVF couples and leads to lack of transfer or implantation failure. These data on fresh zygote transfers are encouraging and may provide a valid alternative solution for some of these patients. Some patients in IVF programmes repeatedly display an abnormal embryonic development characterized as soon as day 2 post fertilization by a high rate of highly fragmented embryos, leading to recurrent IVF failures. We hypothesized that, for various reasons, some embryos were unable to withstand the in-vitro environment and an early pronucleate stage transfer was proposed to these couples. Fifty-three patients with recurrent IVF failures characterized by low embryonic quality were included in this transfer protocol. As in previous cycles, the mean number of oocytes retrieved and the fertilization rate were normal. The mean number of zygotes per transfer was 2.24. Fourteen clinical pregnancies were obtained, representing a pregnancy rate and a delivery rate per oocyte retrieval of 26.4% and 18.9%, respectively. Recurrent early and heavy embryo fragmentation in vitro characterizes around 3% of IVF couples and leads to lack of transfer or implantation failure. Our data on fresh zygote transfers are encouraging and may provide a valid alternative solution for these patients.
Authors:
Nathalie Sermondade; Vanina Delarouzière; Célia Ravel; Isabelle Berthaut; Lieve Verstraete; Emmanuelle Mathieu; Jean-Marie Antoine; Jacqueline Mandelbaum
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-24
Journal Detail:
Title:  Reproductive biomedicine online     Volume:  -     ISSN:  1472-6491     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-3-1     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101122473     Medline TA:  Reprod Biomed Online     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Reproductive Healthcare Ltd. Published by Elsevier Ltd. All rights reserved.
Affiliation:
Service d'Histologie et Biologie de la Reproduction, Assistance Publique Hôpitaux de Paris (APHP)-Hôpital Tenon, Paris, France; ER9, Université Pierre et Marie Curie (Paris VI), Paris, France.
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