Vitrification of blastocysts derived from fair to poor quality cleavage stage embryos can produce high pregnancy rates after warming.
J Assist Reprod Genet
; 30(8): 1035-42, 2013 Aug.
Article
em En
| MEDLINE
| ID: mdl-23838796
ABSTRACT
PURPOSE:
This study investigates whether certain embryos considered unsuitable for cryopreservation on day 3 might nevertheless have the potential to develop into worthwhile blastocysts that could be vitrified in the same cycle.METHODS:
Retrospective study between 2010 and 2011, embryo transfers and cryopreservation took place mainly on day 3 in our centre. Supernumerary embryos of intermediate to poor quality were reassessed on days 5/6 and any good quality blastocysts were vitrified.RESULTS:
Out of 914 cleavage stage (day 3) embryos left in culture, 16 % were vitrified on days 5/6. Fifty blastocyst warming cycles resulted in a 76 % survival rate, 44 % clinical pregnancy rate and 39 % implantation rate. During the same time period, 213 warming cycles of good quality cleavage stage embryos rendered survival rates, clinical pregnancy and implantation rates of 97 %, 23 % and 16 % respectively.CONCLUSIONS:
Supernumerary average quality day 3 embryos should be given a second chance to be selected for cryopreservation. If blastocysts are obtained and survive vitrification, there is a good chance of implantation thus reducing embryo waste.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Blastocisto
/
Taxa de Gravidez
/
Técnicas de Cultura Embrionária
/
Vitrificação
Tipo de estudo:
Observational_studies
Limite:
Female
/
Humans
/
Pregnancy
Idioma:
En
Revista:
J Assist Reprod Genet
Ano de publicação:
2013
Tipo de documento:
Article