No a referable quality
selection criteria for a single vitrified-warmed blastocyst transfer.
Therefore, the present study aimed to investigate the relationship between
vitrified-warmed blastocyst score and clinical pregnancy outcomes. This
retrospective analysis consisted of 221 patients undergoing two blastocysts
transfer on thawing day. Implantation rate, fetal heart pregnancy rate,
live-birth rate, multiple birth rate were analyzed.
When a
patient received two high-quality vitrified-warmed blastocysts (=3BB),
implantation rate and fetal heart pregnancy rate were 48.2% and 65.5%,
respectively. The multiple birth rates in this group were 44.4%. When two
vitrified-warmed blastocysts (one =3BB and another <3BB) were available for
transfer, implantation rate and fetal heart pregnancy rate were 34.5% and
52.7%. The multiple birth rate for this group was 29.6%. When only two
generalquality vitrified-warmed blastocysts (<3BB) were transferred,
implantation rate and fetal heart pregnancy rate were 21.7% and 35.9%, and the
multiple birth rate was 21.7%.
The ability
to transfer one good-quality vitrified-warmed blastocyst (=3BB) should lead to
fetal heart pregnancy rates greater than 52% and live birth rates greater than
36%. Results of the present study can provide guidelines for a single
vitrified-warmed blastocyst transfer, which is an effective means of
eliminating multiple gestations and avoiding the complications associated with
such pregnancies.
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