The road to blastocyst transfer

Blastocyst development rate impacts outcome in cryopreserved blastocyst transfer cycles.

OBJECTIVE To assess cycle outcome among day 5 and day 6 cryopreserved frozen-thawed blastocyst embryo transfers (FBET). DESIGN Retrospective cohort study. SETTING Military-based assisted reproduction technology (ART) center. PATIENT(S) One hundred seventy-two nondonor, programmed cryopreserved embryo cycles. INTERVENTION(S) Fully expanded blastocysts on day 5 were cryopreserved on day 5...

I-7: Introducing Blastocyst Culture and Transfer into Clinical Practice

Blastocyst transfer in frozen-thawed cycles

OBJECTIVE It is well known that fresh blastocyst transfer results in better pregnancy outcomes with a smaller number of transferred embryos compared with cleavage stage embryo transfer. However, in terms of frozen-thawed blastocyst transfer, only a few studies are available. We aimed to evaluate clinical outcomes of frozen-thawed embryo transfer (FET) with blastocysts. METHODS Retrospective a...

Pregnancy outcome after blastocyst transfer as compared to early cleavage stage embryo transfer.

BACKGROUND Retrospective cohort study to evaluate differences in outcome when embryo transfer was performed either on day 2-3 (cleavage stage, CS-group) or on day 4-5 (blastocyst stage, BS-group). METHODS A total of 1259 consecutive cycles yielding 500 live born babies performed at a single centre in Bregenz, Austria, were included. Main outcome measures were implantation and (multiple) pregn...

Rescuing human embryonic stem cell research: the Blastocyst Transfer Method.

Despite the therapeutic potential of human embryonic stem (HES) cells, many people believe that HES cell research should be banned. The reason is that the present method of extracting HES cells involves the destruction of the embryo, which for many is the beginning of a person. This paper examines a number of compromise solutions such as parthenogenesis, the use of defective embryos, geneticall...