Does a vitrified blastocyst stage embryo transfer program need hormonal priming for endometrial preparation?

Area of Science:

• Reproductive Endocrinology
• Assisted Reproductive Technology
• Embryology

Background:

• Vitrified blastocyst embryo transfer (ET) is a key component of assisted reproductive technology.
• Endometrial preparation protocols vary, including natural, ovulation-induced, and artificial cycles.
• Optimizing endometrial receptivity is crucial for successful implantation.

Purpose of the Study:

• To compare clinical outcomes of vitrified blastocyst ET across different endometrial preparation protocols: natural, ovulation-induced, and artificial cycles.
• To evaluate the impact of endometrial preparation type on pregnancy, implantation, and endometrial patterns.
• To determine if hormonal priming is necessary for vitrified blastocyst ET.

Main Methods:

• Retrospective analysis of clinical outcomes in women undergoing vitrified blastocyst ET.
• Categorization into three groups based on endometrial preparation: natural (n=34), ovulation-induced (n=21), and artificial cycles (n=70).
• Comparison of pregnancy rates, implantation rates, endometrial thickness, and endometrial patterns.

Main Results:

• Overall pregnancy rate was 48.8% with no significant differences among the three groups.
• Implantation rates and clinical pregnancy rates were similar across natural, ovulation-induced, and artificial cycles.
• Triple-line endometrial patterns were more frequent in natural and ovulation-induced groups compared to artificial cycles.

Conclusions:

• Endometrial preparation type (natural, ovulation-induced, artificial) does not significantly affect clinical outcomes in vitrified blastocyst ET.
• Hormonal priming does not appear to be a prerequisite for successful vitrified blastocyst embryo transfer.
• These findings support flexibility in choosing endometrial preparation protocols for vitrified blastocyst ET programs.