The impact of endometriosis on embryo morphokinetics: embryos from endometriosis patients exhibit delayed cell cycle milestones and decreased blastulation rates

The effect of endometriosis on oocyte quality: mechanisms, diagnosis and treatment

Endometriosis significantly impacts the physical and mental health of women of reproductive age. While some patients can achieve pregnancy through surgery or in vitro fertilization (IVF), many still struggle with IVF failure due to poor oocyte quality. This presents a major clinical challenge that requires immediate attention. The causes of oocyte quality decline in endometriosis patients are diverse and have not yet been definitively identified. Furthermore, effective diagnostic mechanisms and therapeutic strategies remain elusive. To provide possible clinical solutions to improve pregnancy rates in patients with endometriosis, this review evaluates the current literature on the impact of endometriosis on oocyte quality, the possible mechanisms and management strategies of endometriosis leading to poor oocyte quality.

Comparison of success rates in early stages of in vitro fertilization (IVF) in women with and without endometriosis

Endometriosis remains a significant challenge for reproductive-aged women and is frequently associated with infertility. Although in vitro fertilization (IVF) is used to address infertility in women with endometriosis, its effectiveness in this context is still debated, particularly in developing countries such as Indonesia, where IVF remains a major challenge. The aim of this study was to investigate the success rates of early stages of IVF in women with and without endometriosis. A retrospective cohort study was conducted at the Graha Amerta Fertility Clinic, located within Dr. Soetomo Academic General Hospital in Surabaya, Indonesia. The quantity and quality of oocytes (the number of oocytes obtained by ovum pick-up (OPU) and the number of metaphase II (MII) oocytes), fertilization quality (the number of two-pronuclei oocytes and fertilization rate), embryo development quality (cleavage rate and blastocyst rate), biochemical pregnancy, clinical pregnancy, and live birth rate were collected from IVF patients between 2017-2022. Independent Student's t-test or Mann-Whitney test was used accordingly for comparison analysis. A total of 410 IVF patients were included in the study; 93 had endometriosis, while 317 had no endometriosis. Oocyte quantity obtained by OPU (p = 0.016) and oocyte quality (p = 0.045), as measured by the number of MII oocytes, were significantly lower in the endometriosis group compared to the non-endometriosis group. However, there were no significant differences between the two groups in terms of the number of two-pronuclei oocytes (p = 0.105), fertilization rate (p = 0.987), cleavage rate (p = 0.467), blastocyst rate (p = 0.128), biological pregnancy rates (OR: 0.98; 95%CI: 0.60- 1.60; p = 0.940), clinical pregnancy rate (OR: 0.69; 95%CI: 0.39-1.24, p = 0.219), or live birth rate (p = 0.609). These findings suggest that while endometriosis may reduce oocyte quantity and quality, it does not significantly impact the success rates of IVF.

Does endometriosis inflict harm on embryos? A systematic review of embryo morphokinetics analysed by time lapse monitoring in women with endometriosis

Endometriosis has been shown to be associated with unfavorable development and maturation of oocytes, as well as aberrancies in embryonal development, including arrest after fertilization, following in vitro fertilization (IVF). Time-lapse monitoring (TLM) enables continuous and non-invasive monitoring of embryo morphokinetics during the IVF process and might be useful in the assessment of embryos from women with endometriosis. In this review, five eligible studies were evaluated to determine if embryo morphokinetics assessed under TLM differ in patients with endometriosis and subsequently predict blastocyst quality, implantation and success of pregnancy. The studies showed overall inferior morphokinetic parameters of embryos from endometriosis patients when compared to controls, independent of the severity of endometriosis. Embryos with optimal early morphokinetic parameters (t2, s2, t5, tSB, tEB) and late developmental events (compaction, morulation, and blastulation) had better implantation rates than those who had suboptimal ranges. However, due to few studies available with mostly retrospective data, the validity of these findings and their generalizability for clinical practice needs to be further assessed. Prospective studies with larger sample sizes are needed to determine whether using TLM for embryo selection in endometriosis improves pregnancy and live birth outcomes.

Fertility Preservation in Women with Endometriosis

Several mechanisms have been implicated in the pathogenesis of endometriosis-related infertility. For patients considering surgery, the risk of iatrogenic injury is among the most important factors in the context of fertility preservation, along with age and individual reproductive goals. In the case of endometrioma excision, evidence overwhelmingly demonstrates the negative impact of surgery on ovarian reserve, with significant reductions in antimullerian hormone (up to 30% in unilateral versus up to 44% in bilateral endometriomas). The surgical endometriosis patient should be thoroughly counseled regarding fertility preservation and discussion should include tissue, embryo, and oocyte cryopreservation options. For the latter, data support cryopreservation of 10-15 oocytes in women ≤35 years and over 20 for those >35 years for a realistic chance to achieve one or more live births. When performing surgical interventions for endometriosis, reproductive surgeons should employ fertility-conserving surgical methods to reduce the likelihood of postoperative iatrogenic diminished ovarian reserve.