First polar body morphology and blastocyst formation rate in ICSI patients

BACKGROUND: It may be beneficial to identify, at a very early stage of development, concepti that will result in viable blastocysts by using a non-invasive technique. METHODS: Homogeneous groups in terms of first polar body (PB) morphology were analysed with regard to fertilization, embryo quality a...

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Bibliographic Details
Published in:Human reproduction (Oxford) 2002-09, Vol.17 (9), p.2415-2418
Main Authors: Ebner, T., Moser, M., Sommergruber, M., Yaman, C., Pfleger, U., Tews, G.
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Birth control
Blastocyst - physiology
blastocyst formation
Embryo Implantation
Embryo, Mammalian - physiology
Female
Fertilization
first polar body
Gynecology. Andrology. Obstetrics
Humans
ICSI
Medical sciences
non-invasive selection
oocyte quality
Oocytes - physiology
Oocytes - ultrastructure
Pregnancy
Pregnancy Rate
Prospective Studies
Sperm Injections, Intracytoplasmic
Sterility. Assisted procreation
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Summary:BACKGROUND: It may be beneficial to identify, at a very early stage of development, concepti that will result in viable blastocysts by using a non-invasive technique. METHODS: Homogeneous groups in terms of first polar body (PB) morphology were analysed with regard to fertilization, embryo quality and blastocyst formation. The strategy was to transfer a maximum of two blastocysts with an adequate inner cell mass deriving from oocytes with identical first PBs in order to obtain information about the actual implantation potential. RESULTS: A significant relationship between first PB morphology and embryo quality was found. Fragmentation after 2 days was increased in embryos derived from oocytes with fragmented first PBs (P < 0.05) in comparison with those derived from oocytes with intact PBs. No similar correlation could be demonstrated for fertilization rate. Embryos in the intact first PB group showed an increased rate of blastocyst formation as compared with the fragmented first PB group (P < 0.05). In addition, a significant difference in implantation rate (48.6 versus 22.0%; P < 0.025) and ongoing pregnancy rate (68.4 versus 34.8%; P < 0.05) was observed for the intact versus fragmented groups respectively. CONCLUSION: In conclusion, the current study provides further evidence that preselection at a very early stage may be helpful in identifying a subgroup of preimplantation embryos with a good prognosis to form blastocysts and, consequently, to implant.
ISSN:0268-1161
1460-2350
1460-2350
DOI:10.1093/humrep/17.9.2415