Implantation Failure: Where to Look Up?

Area of Science:

• Reproductive Medicine
• Embryology
• Gynecology

Background:

• Successful pregnancy requires competent embryos and a receptive endometrium for implantation.
• Many women undergoing in vitro fertilization (IVF) experience implantation failure, with recurrent implantation failure (RIF) affecting 10-25% of patients.
• RIF is a complex condition with multifactorial causes, necessitating a comprehensive understanding.

Purpose of the Study:

• To review and understand the multifaceted causes of recurrent implantation failure (RIF).
• To explore factors contributing to RIF, including gamete/embryo quality, chromosomal issues, uterine environment, and endometrial receptivity.
• To highlight novel therapeutic strategies for improving pregnancy outcomes in RIF patients.

Main Methods:

• Literature review focusing on factors influencing embryo implantation.
• Analysis of research on gamete and embryo quality, chromosomal abnormalities, and uterine factors.
• Exploration of immune cell biomarkers and microbiota in RIF.
• Review of emerging therapies like platelet-rich plasma (PRP) and peripheral blood mononuclear cell (PBMC) insemination.

Main Results:

• RIF is associated with a combination of factors, including suboptimal gamete/embryo quality, aneuploidy, and an unreceptive uterine environment.
• Endometrial receptivity, immune dysregulation, and microbiota imbalances are significant contributors to RIF.
• Novel therapies like activated autologous PRP and PBMC insemination show potential in managing RIF.

Conclusions:

• A thorough evaluation of various factors is crucial for diagnosing and managing RIF.
• Understanding the complex interplay of gamete, embryo, and maternal factors is key to overcoming implantation challenges.
• Emerging therapeutic approaches offer new hope for improving IVF success rates in patients with RIF.