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This study aimed to develop and validate a predictive model for failure to collect oocytes in the Patient-Oriented Strategies Encompassing Individualized Oocyte Number (POSEIDON) Groups 3 and 4 during their first in vitro fertilization/intracytoplasmic sperm injection (IVF/ICSI) cycle. A retrospective analysis was conducted on patients in POSEIDON Groups 3 and 4 who underwent their first IVF/ICSI cycle at our center from January 2016 to December 2023. A total of 2,373 patients were randomly assigned to the training or validation cohort at a ratio of 6:4.

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Background: The gonadotropin-releasing hormone antagonist (GnRH-ant) protocol is associated with few oocytes retrieved, few mature oocytes and poor endometrial receptivity. Omission of GnRH-ants on trigger day seems unlikely to induce preovulation and may improve outcomes in the GnRH-ant protocol. This study aimed to systematically evaluate the effects of GnRH-ant cessation on trigger day on in vitro fertilisation outcomes following the GnRH-ant protocol.

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Impact of previous cesarean delivery on pregnancy and neonatal outcomes in subsequent in vitro fertilization/intracytoplasmic sperm injection and single frozen-thawed embryo transfer: a historical cohort study with a large sample size.

J Assist Reprod Genet

December 2024

State Key Laboratory of Reproductive Medicine and Offspring Health, Center for Reproductive Medicine, Institute of Women, Children and Reproductive Health, Shandong University, Jinan, 250012, China.

Purpose: This study aims to explore the impact of a woman's previous cesarean delivery (CD) on pregnancy and neonatal outcomes for subsequent in vitro fertilization/intracytoplasmic sperm injection (IVF/ICSI) and single frozen-thawed embryo transfer (FET), compared with vaginal delivery (VD).

Methods: This was a retrospective cohort study that included a total of 5817 patients who desired to transfer a single vitrified-thawed blastocyst from the same oocyte retrieval cycle as their last live birth between January 2011 and January 2021 at a single reproductive medicine center. Patients with a single previous CD were classified in the CD group, while those with a single VD were assigned to the VD group.

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Study Question: Are live birth rates (LBRs) per woman following flexible progestin-primed ovarian stimulation (fPPOS) treatment non-inferior to LBRs per woman following the conventional GnRH-antagonist protocol in expected suboptimal responders undergoing freeze-all cycles in assisted reproduction treatment?

Summary Answer: In women expected to have a suboptimal response, the 12-month likelihood of live birth with the fPPOS treatment did not achieve the non-inferiority criteria when compared to the standard GnRH antagonist protocol for IVF/ICSI treatment with a freeze-all strategy.

What Is Known Already: The standard PPOS protocol is effective for ovarian stimulation, where medroxyprogesterone acetate (MPA) is conventionally administered in the early follicular phase for ovulatory suppression. Recent retrospective cohort studies on donor cycles have shown the potential to prevent premature ovulation and maintain oocyte yields by delaying the administration of MPA until the midcycle (referred to as fPPOS), similar to GnRH antagonist injections.

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Transrectal oocyte retrieval for fertility preservation in virginal women.

Reprod Biomed Online

October 2024

Virginia Center for Reproductive Medicine, Reston, VA, USA; Department of Obstetrics and Gynecology, George Washington University, Washington, DC, USA. Electronic address:

Research Question: How safe and effective is transrectal oocyte retrieval (TROR) for fertility preservation in nulliparous virginal women?

Design: This was a retrospective single-centre study of 105 nulliparous women from five satellite centres of Fakih IVF, UAE, who underwent TROR for oocyte cryopreservation. Extensive bowel preparation and rectal cleansing was performed prior to oocyte retrieval. Patient characteristics, stimulation protocol, and procedure outcome and safety data were collected.

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