New Twists in Ovarian Stimulation and Their Practical Implications

Area of Science:

• Reproductive Endocrinology
• Assisted Reproductive Technology (ART)

Background:

• Ovarian stimulation (OS) aims to maximize oocyte yield for improved ART efficacy.
• Historically, ovarian hyperstimulation syndrome (OHSS) was a major concern, influencing OS protocols.
• Early ART relied on multiple embryo transfers due to low implantation rates.

Purpose of the Study:

• To analyze the evolving objectives and risks associated with ovarian stimulation in ART.
• To highlight the shift in focus from preventing OHSS to managing multiple pregnancies.

Main Methods:

• Review of historical and current practices in ovarian stimulation protocols.
• Discussion of advancements in ART, including antagonist-based protocols and GnRH-agonist triggers.
• Analysis of changing implantation rates and their impact on embryo transfer policies.

Main Results:

• Modern OS protocols (antagonist, GnRH-a trigger) have significantly reduced OHSS risk.
• Increased ART implantation rates have shifted focus towards preventing multiple pregnancies.
• Single embryo transfer (SET) is increasingly advocated globally.

Conclusions:

• The primary risk management goal in OS has transitioned from OHSS to multiple gestation.
• Technological advancements in ART necessitate a re-evaluation of embryo transfer strategies.
• The trend towards SET reflects improved ART success rates and a focus on maternal-fetal safety.