In this prospective study, the possible effects of embryo viability and degree of blastocele re-expansion on pregnancy outcomes before vitrified/thawed blastocyst transfer will be evaluated.
Thanks to the advances in embryo vitrification technologies in recent years, high embryo viability can be achieved after thawing, and live birth rates increase after the transfer of these embryos. Embryo morphology is an essential criterion used to predict embryo viability. Blastocysts endure several morphological challenges during vitrification and thawing, including blastocele collapse, cell collapse, and subsequent rehydration. Blastocysts usually collapse immediately after thawing. Because of these morphological changes, cell damage and loss may occur, and morphological integrity may be impaired. Considering that implantation results may be affected due to supraphysiological high estrogen and progesterone levels due to multi follicular development in the ovaries during fresh embryo transfers, the study is planned to be conducted only in patients who have undergone artificial endometrial preparation with hormone replacement therapy. Only embryos frozen at the blastocyst stage (day 5) will be included in the study. After embryo thawing, an experienced embryologist will evaluate embryo viability and expansion and record it in the system. Approximately 2 hours after the indicated procedure (just before embryo transfer), embryo viability and degree of re-expansion will be re-evaluated by the 2nd experienced Embryologist. The evaluation results of both embryologists (embryo viability and re-expansion streams) will be known only to the primary clinician (Assoc. Prof. Şafak Olgan). Pregnancy results will be learned nine days after embryo transfer, In ultrasonography evaluation three weeks after a positive pregnancy result, a clinical pregnancy will be considered in patients with fetal heartbeat, and morphological differences between the pregnant and non-pregnant groups will be evaluated.
Study Type
OBSERVATIONAL
Enrollment
500
Akdeniz University
Antalya, Turkey (Türkiye)
RECRUITINGClinical pregnancy rate
In ultrasonography evaluation three weeks after a positive pregnancy result, a clinical pregnancy will be considered in patients with a fetal heartbeat.
Time frame: Three weeks after each positive pregnancy test result
Positive β-hCG results
Positive β-hCG results nine days after embryo transfer.
Time frame: Nine days after each embryo transfer
The effect of re-expansion degrees and viability of embryos on pregnancy
The correlation between positive pregnancy results and the degree of embryo re-expansion/collapse in transfer after embryo thawing will be determined.
Time frame: Three weeks after each positive pregnancy test result
Optimal time between two assessments of expansion
The optimal expansion assessment time between thaw and embryo transfer will be determined. The evaluation time interval with the best pregnancy rates will be defined as optimal.
Time frame: About 2 hours between thawing and transfer
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