Study summary · research use only
Intrauterine infusion of human chorionic gonadotropin before embryo transfer in IVF/ET cycle: The critical review
Plain-language summary
Paraphrased from the published abstract below — not a verdict on whether anything works.
This review discusses intrauterine infusion of human chorionic gonadotropin (IUI-hCG) before embryo transfer in human IVF-ET cycles, describing hCG as an early embryonic signal involved in decidualization, angiogenesis, maternal immune tolerance, and trophoblast invasion. The authors note that although multiple clinical trials have examined IUI-hCG's impact on IVF-ET outcomes, findings have been described as controversial, potentially due to differences in study design and population, and that endometrial receptivity has not been assessed in women receiving this intervention. The authors state that selecting an appropriate population based on known etiology and identifying optimal indications for IUI-hCG should be prioritized in future investigation.
Abstract
Intrauterine infusion of human chorionic gonadotropin (IUI-hCG) has been proposed to improve the outcome of in vitro fertilization-embryo transfer (IVF-ET), since it plays a critical role in synchronizing endometrial and fetal development. As the early mediator from embryo, hCG promotes the decidualization, angiogenesis, maternal immune tolerance, and trophoblast invasion, favoring successful implantation of embryo. Although multiple clinical trials have been conducted to verify the efficacy of IUI-hCG on IVF-ET outcome in recent years, the findings remained controversial. The difference in study design and population might be the cause to the different consequences after administration of hCG. More importantly, the endometrial receptivity, which might affect the efficacy of IUI-hCG, has not been assessed in women receiving this intervention. Selecting the right population suitable for IUI-hCG based on known etiology would be crucial in enhancing its efficacy and minimize any possible complications. Investigation of optimal indications for IUI-hCG should be highlighted in the future.
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