[Relationship between the human zygote type and embryo implantation potential].
OBJECTIVE
To evaluate the relationship between the human zygote types and the quality of embryos, the embryo implantation rate, the multiple pregnancy rate in IVF-ET.


METHODS
By using the criteria based on the number and distribution of nucleolar precursor bodies in each pronucleus, zygotes were divided into 0-5 types according to Tesarik's methods. In order to understand the best embryo rates that came from various types of zygote, on the one hand we compared the embryo implantation rate of different kinds of zygotes, on the other hand we defined the relationship between the multiple pregnancy rate and embryo which came from 0 type or non-0 type zygotes.


RESULTS
The fine embryo rate coming from 0 type zygotes wasn't different from other types. Due to using of 0 type zygote criteria, embryo implantation rate of the experimental group was high. Along with the embryo number coming from 0 type zygotes was growing, the multiple pregnancy rate was increasing.


CONCLUSIONS
Fine embryos coming from 0 type zygotes have high implantation potency. If the transferred fine embryos came from 0 type zygotes completely, we should limit the number of transferred embryos in order to reduce the multiple pregnancy rate.
Tian
Li
L
Reproductive Medicine Center, Peking University People's Hospital, Beijing 100044, China. litian916@hotmail.net
Wang
Shanmi
S
Wang
Jun
J
Shen
Huan
H
D002467:Cell Nucleus; D010064:Embryo Implantation; D004624:Embryo Transfer; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D011247:Pregnancy; D018873:Pregnancy Rate; D015053:Zygote