Empty Follicle Syndrome: The Possible Cause of Occurrence

Risk factors for empty follicle syndrome in diminished ovarian reserve patients undergoing intracytoplasmic sperm injection cycles: A retrospective observational analysis

The aim of this study is to evaluate the risk factors for empty follicle syndrome (EFS) in patients with diminished ovarian reserve (DOR) undergoing an intracytoplasmic sperm injection cycle. In this retrospective study, patients with DOR were divided into 2 groups according to the presence of empty follicles on the day of oocyte retrieval. Patient age, body mass index (BMI), anti-Müllerian hormone (AMH), baseline follicle stimulating hormone (FSH) and estradiol (E2) levels, basal antral follicle count (AFC), total gonadotropin dose, and day of stimulation were recorded as risk factors. The association between EFS and these variables was assessed using the logistic regression method and ROC curve analysis. Increased BMI, low AMH, higher baseline FSH, low baseline AFC, higher gonadotropin dose, and longer day of ovulation induction were independent risk factors for EFS in patients with DOR. ROC curve analysis showed that BMI, AMH, baseline FSH, baseline AFC, higher gonadotropin dose, and longer ovulation induction days were predictive parameters in this group. According to the current study, higher BMI, lower AMH, higher baseline FSH, lower baseline AFC, higher gonadotropin dose and longer ovulation induction days were independent risk factors for EFS in patients with reduced ovarian reserve.

Risk factors, management, and future fertility of empty follicle syndrome: a retrospective study with real-world data

Background

Empty follicle syndrome (EFS) is a challenging clinical problem. This study aims to identify the risk factors for EFS, to present pregnancy outcomes in both EFS cycle as well as subsequent cycles, and to summarize an effective rescue protocol to improve outcomes.

Methods

A retrospective analysis between 2016 and 2020 was conducted at our center. Stricter criteria were applied to diagnose EFS. Logistic regression analysis was used to identify the risk factors for EFS. Further analyses were performed within the EFS cycle to present pregnancy outcomes and to find optimal rescue protocols. Long-term follow-up was conducted until live birth was achieved, covering at least two complete oocyte retrieval cycles.

Results

Among 14,066 patients, 54 (0.38%) were identified as EFS. Patients with polycystic ovary syndrome (PCOS) had a significantly higher risk of developing EFS than non-PCOS ones (aOR = 2.67; 95% CI, 1.47 to 4.83). Within EFS patients, delaying the second oocyte retrieval by 3-6 h significantly improved the rates of obtaining oocyte (97.4% versus 58.3%, P = 0.002), getting embryo available for transfer (92.3% versus 33.3%, P < 0.001), and pregnancy (48.7% versus 8.3%, P = 0.017) compared to other delayed retrieval times. Overall, 31.5% (17/54) and 46.7% (7/15) EFS patients achieved live birth in the EFS cycle and the future cycle, respectively.

Conclusions

PCOS is an independent risk factor for EFS, indicating that longer exposure time to human chorionic gonadotropin (hCG) may be necessary. Delaying the second oocyte retrieval by 3-6 h is an effective rescue protocol for EFS patients to achieve optimal outcomes. EFS in a single cycle does not necessarily indicate future fertility decline, but repeated EFS may result in poor outcomes.

Risk factors for poor oocyte yield and oocyte immaturity after GnRH agonist triggering

STUDY QUESTION

What are the potential risk factors for poor oocyte recuperation rate (ORR) and oocyte immaturity after GnRH agonist (GnRHa) ovulation triggering?

SUMMARY ANSWER

Lower ovarian reserve and LH levels after GnRHa triggering are risk factors of poor ORR. Higher BMI and anti-Müllerian hormone (AMH) levels are risk factors of poor oocyte maturation rate (OMR).

WHAT IS KNOWN ALREADY

The use of GnRHa to trigger ovulation is increasing. However, some patients may have a suboptimal response after GnRHa triggering. This suboptimal response can refer to any negative endpoint, such as suboptimal oocyte recovery, oocyte immaturity, or empty follicle syndrome. For some authors, a suboptimal response to GnRHa triggering refers to a suboptimal LH and/or progesterone level following triggering. Several studies have investigated a combination of demographic, clinical, and endocrine characteristics at different stages of the treatment process that may affect the efficacy of the GnRHa trigger and thus be involved in a poor endocrine response or efficiency but no consensus exists.

STUDY DESIGN, SIZE, DURATION

Bicentric retrospective cohort study between 2015 and 2021 (N = 1747).

PARTICIPANTS/MATERIALS, SETTING, METHODS

All patients aged 18-43 years who underwent controlled ovarian hyperstimulation and ovulation triggering by GnRHa alone (triptorelin 0.2 mg) for ICSI or oocyte cryopreservation were included. The ORR was defined as the ratio of the total number of retrieved oocytes to the number of follicles >12 mm on the day of triggering. The OMR was defined as the ratio of the number of mature oocytes to the number of retrieved oocytes. A logistic regression model with a backward selection method was used for the analysis of risk factors. Odds ratios (OR) are displayed with their two-sided 95% confidence interval.

MAIN RESULTS AND THE ROLE OF CHANCE

In the multivariate analysis, initial antral follicular count and LH level 12-h post-triggering were negatively associated with poor ORR (i.e. below the 10th percentile) (OR: 0.61 [95% CI: 0.42-0.88]; P = 0.008 and OR: 0.86 [95% CI: 0.76-0.97]; P = 0.02, respectively). A nonlinear relationship was found between LH level 12-h post-triggering and poor ORR, but no LH threshold was found. A total of 25.3% of patients suffered from oocyte immaturity (i.e. OMR < 75%). In the multivariate analysis, BMI and AMH levels were negatively associated with an OMR < 75% (OR: 4.34 [95% CI: 1.96-9.6]; P < 0.001 and OR: 1.22 [95% CI: 1.03-1.12]; P = 0.015, respectively). Antigonadotrophic pretreatment decreased the risk of OMR < 75% compared to no pretreatment (OR: 0.72 [95% CI: 0.57-0.91]; P = 0.02).

LIMITATIONS, REASONS FOR CAUTION

Our study is limited by its retrospective design and by the exclusion of patients who had hCG retriggers. However, this occurred in only six cycles. We were also not able to collect information on the duration of pretreatment and the duration of wash out period.

WIDER IMPLICATIONS OF THE FINDINGS

In clinical practice, to avoid poor ORR, GnRHa trigger alone should not be considered in patients with higher BMI and/or low ovarian reserve, balanced by the risk of ovarian hyperstimulation syndrome. In the case of a low 12-h post-triggering LH level, practicians must be aware of the risk of poor ORR, and hCG retriggering could be considered.

STUDY FUNDING/COMPETING INTEREST(S)

None.

TRIAL REGISTRATION NUMBER

N/A.

Association between oocyte retrieval technique and number of oocytes retrieved

PURPOSE

To assess if there is an optimal oocyte retrieval (OR) technique to retrieve a maximum number of oocytes and mature oocytes (MII).

METHODS

Retrospective cohort study in which nine physicians completed a survey on OR techniques. Number of oocytes/follicle cohort, MIIs/follicle cohort, and MIIs/oocytes retrieved (%MII) were assessed for each technique for patients undergoing OR from 3/2013 to 7/2019. Data were stratified by number of follicles on ultrasound on day of trigger (< 6, 6-10, > 10).

RESULTS

Patient demographics were equivalent between techniques. For < 6 follicles, three techniques resulted in significantly fewer oocyte/follicle (0.97 ± 0.48, 0.95 ± 0.66, and 0.90 ± 0.41) compared to the top-performing technique (TPT) (1.11 ± 0.55). For 6-10 follicles, two techniques resulted in significantly fewer oocyte/follicle (0.95 ± 0.39 and 0.93 ± 0.35) compared to the TPT (1.06 ± 0.42). A different technique had higher %MII (0.77 ± 0.19) compared to two techniques (0.74 ± 0.21 and 0.72 ± 0.22). For > 10 follicles, two techniques resulted in significantly fewer oocyte/follicle (1.01 ± 0.42 and 1.07 ± 0.40) compared to the TPT (1.15 ± 0.41). These two techniques also resulted in fewer MII/follicle (0.75 ± 0.33 and 0.81 ± 0.34 vs. 0.87 ± 0.34). There was no consistent TPT across follicle number groups or for all outcome variables.

CONCLUSIONS

There does not appear to be a clear TPT, even for patients with few follicles. Providers who perform OR in a similar fashion to physicians at our institution should feel confident that those techniques obtain equivalent oocyte yields.

Ovarian Rejuvenation Through Platelet-Rich Autologous Plasma (PRP)-a Chance to Have a Baby Without Donor Eggs, Improving the Life Quality of Women Suffering from Early Menopause Without Synthetic Hormonal Treatment

Due to the fact that modern American and European women postpone childbirth until later in life, they are more likely to face the problem of ovarian insufficiency by the time they are ready to have children. So, the ability to restore the ovarian function safely is crucially important. Our study involved 38 women 31-45 years of age with low ovarian reserves and at least two unsuccessful attempts to receive their oocytes through IVF. The blood from the patients was collected into two BD vacutainers for PRP preparation. The platelet concentration in the PRP was 1 × 10⁶ μl. PRP injections into the ovaries were performed by a gynecologist with a special 25G needle, 20 cm in length, as an ultrasound-guided procedure or a laparoscopic-assisted approach. After PRP treatment, women were tested with several criteria for 12 months. We saw a significant improvement in hormone levels; six healthy babies were born, ten pregnancies were achieved, and four out of the ten were from natural conception. The PRP injections into the ovaries are safe, productive, and a natural treatment that may help women with premature ovarian insufficiency to give birth to their own child. The difference and novelty with our method of ovarian rejuvenation is in obtaining a higher platelet concentration (about 1 × 10⁶ μl), which allows us to achieve long-lasting results, within 12 months, after a single procedure. Additionally, for the first time, we proposed and successfully performed a laparoscopically assisted technique for administering PRP into the ovary.

Characteristics of Empty Follicular Syndrome during In vitro Fertilization Embryo Transfer and its Association with Various Etiologies in Comparatively Young Patients

Background:

Nearly 0.6%–7% of patients undergoing in vitro fertilization embryo transfer (IVF ET) will not be able to yield any oocyte despite successful ovarian stimulation and this condition is called as empty follicular syndrome (EFS). EFS is a dreadful situation for clinicians as well as patients, seems to be an unavoidable clinical condition despite a proper ovarian stimulation.

Materials and Methods:

This was a retrospective observational study conducted at a tertiary hospital; 1103 patients who underwent IVF ET between January 2016 and May 2017 were included in the study.

Study Outcome:

To estimate the incidence of empty follicle syndrome (EFS) and to study the associated factors.

Results:

There were 53 (4.8%) cases of EFS out of 1103 cycles of IVF ET; 43 (3.9%) cases were false EFS and 10 (0.9%) cases were genuine EFS. Mean age of EFS group and oocyte retrieved group was 30.17 years and 29.12 years respectively. Recurrence rate of EFS during the next IVF cycle was 36.8%. Decreased ovarian reserve was associated with an increased chance of EFS (54.7%) with a recurrence rate as high as 57%.

Conclusion:

The incidence of EFS is not an uncommon clinical scenario; it depends upon ovarian reserve to a great extent. Young age is not immune for the occurrence of EFS as there is a similar incidence in comparatively younger age group in our study. EFS is seen in all etiological groups of infertility, but only respite is that there is a chance of about 63.2% oocyte retrieval during repeat IVF cycle.

Successful Oocyte Retrieval, Fertilization, and Clinical Pregnancy with Low Serum β-hCG on the Day of Oocyte Collection: A Reappraisal of the Definition of the Empty Follicle Syndrome

Objective

To describe a case of successful oocyte retrieval, fertilization and clinical pregnancy despite very low β-hCG level, twelve hours after ovulation trigger.

Design

Case report. Setting. Academic medical center. Patient. A 38-year-old patient inadvertently administered 2,000 IU hCG for final oocyte maturation; serum hCG twelve hours later was 16 IU/L. Interventions. Effort to obtain and administer a booster dose of hCG over the next twenty-seven hours failed. Main Outcome. Successful oocyte retrieval.

Results

Fourteen oocytes were retrieved of which twelve were in metaphase II and nine fertilized after intracytoplasmic sperm injection (ICSI). Of these, eight embryos survived to day 5 and were subjected to preimplantation genetic screening (PGS) by comparative genomic hybridization (CGH). Results were available the next day, three of the embryos were euploid and one was transferred on day 6. Pregnancy was confirmed twelve days later and currently the patient has an ongoing singleton intrauterine pregnancy.

Conclusion

Reproductive Endocrinology and Infertility specialists should be aware that final oocyte maturation could occur following injection of a lower dose of hCG with excellent fertilization rate and embryo development.

Evaluation of follicular fluid's Beta-Human chorionic gonadotropin in the follicles of patient undergoing Intracytoplasmic sperm injection: A cross-sectional study

Background

The failure to retrieve oocytes from mature ovarian follicles is referred to as empty follicle syndrome. There is no exact explanation to this problem and it cannot be predicted using ultrasound or serum hormonal levels. The underlying mechanism of Empty follicle syndrome remains obscure.

Objective

In this study, the authors have investigated the relationship between the Beta-Human chorionic gonadotropin ( β HCG) levels in the follicular fluid with or without the oocyte in the follicles of patients undergoing Intracytoplasmic Sperm Injection.

Materials and Methods

Seventy-three infertile couples underwent standard long protocol induction ovulation for Intracytoplasmic sperm injection. On the day of oocyte retrieval, each patient had two samples; follicular fluid including 2-3 follicles with oocyte and follicular fluid including of 2-3 follicles without oocyte were collected in separate tubes. These follicles had similar shape and size. The Samples were transferred to a laboratory for measuring the β HCG level, after which the β HCG levels were compared to the follicles with and without the oocyte in each patient.

Results

In this study, the β HCG level of follicular fluid in the follicles containing oocyte was 18.20 (8.35-42.92) IU/L and in the follicles without the oocyte was 13.50 (5.45-25.81) IU/L. Levels of β HCG in the follicular fluids containing the oocyte were higher than without oocytes, This difference was not statistically significant (p = 0.16).

Conclusion

It seems that the follicular fluid β HCG isn't caused by empty follicle syndrome, and that dysfunctional folliculogenesis may be the cause of this syndrome.

Empty Follicle Syndrome: A Challenge to Physician

Background:

Empty follicle syndrome (EFS) is a condition in which no oocytes are retrieved from normally growing ovarian follicles after ovarian stimulation. It is a rare and frustrating condition of obscure etiology.

Objective:

The objective of this study was to estimate the incidence of EFS and study factors related to it.

Design:

This was a retrospective study.

Setting:

This study was conducted in hospital-based research center.

Methods:

In 1968 in vitro fertilization cycles from January 2010 to August 2016 were studied. Agonist, antagonist, and miniflare protocols were used for the stimulation.

Results:

The incidence of EFS is 2.38% (47/1968 cycles). Antagonist protocol group (76.59%, n = 36) had highest incidence of EFS (6.69%). Literature on EFS depicts decreased ovarian reserve (DOR) as the main cause, but only 4.25% of patients had DOR in our study. Interestingly, polycystic ovary syndrome and unexplained infertility were found in 31.9% of the cases. Serum anti-Müllerian hormone (AMH) levels (mean ± standard deviation [SD]) were 4.47 ± 3.54 ng/ml, and antral follicle count (AFC) was 15.30 ± 8.07 (mean ± SD) emphasizing that diminished ovarian reserve is not the main factor for EFS. All patients (n = 95) who underwent ovum pickup on day when any patient had EFS were taken as control. Patients with EFS were compared with controls. A statistically significant difference was not observed in serum AMH (P = 0.38) and AFC (P = 0.52).

Conclusion:

EFS is an uncommon event. Antagonist cycles have higher chances of empty follicle at ovum pickup. Looking at the profile of patients in this study, we conclude that EFS is not a manifestation of DOR.

Delayed Start Protocol with Gonadotropin-releasing Hormone Antagonist in Poor Responders Undergoing In Vitro Fertilization: A Randomized, Double-blinded, Clinical Trial

Objectives

We sought to determine the effects of the delayed start protocol with gonadotropin-releasing hormone (GnRH) antagonists in poor responders undergoing in vitro fertilization (IVF).

Methods

This randomized clinical trial was conducted during a 15-month period from April 2014 to July 2015 in clinics in Shiraz, Iran. A total of 42 poor responders with primary infertility were randomly assigned to the controlled ovarian stimulation group utilizing the delayed start protocol (n = 21) or the traditional group (n = 21) using GnRH antagonist, Cetrotide. The primary endpoint was the number of patients undergoing oocyte pick-up, implantation, and the rate of pregnancy.

Results

The baseline characteristics of the two study groups were comparable including age, infertility duration, and body mass index. The number of follicles measuring > 13 mm in diameter (p = 0.057), retrieved oocytes (p = 0.564), mature metaphase II oocytes (p = 0.366), embryos (p = 0.709), and transferred embryos (p = 0.060) were comparable between the two groups. The number of patients undergoing oocyte pick-up (p = 0.311), the rates of implantation (p = 0.407), and pregnancy (p = 0.596) were also comparable between the two groups.

Conclusions

The delayed start protocol was not associated with better conception results or cycle outcomes in poor responders with primary infertility undergoing IVF cycles.

Empty Follicle Syndrome Following GnRHa Trigger in PCOS Patients Undergoing IVF Cycles

BACKGROUND

The objective of this study was to analyze the incidence and the underlying mechanisms of empty follicle syndrome (EFS) occurring in gonadotropin releasing hormone agonist (GnRHa) triggered in in vitro fertilization (IVF) cycles with GnRH antagonist protocol in women with polycystic ovary syndrome (PCOS) of Indian origin. The study also intended to evaluate the cycle outcome following a rescue trigger.

METHODS

Retrospective cohort analysis of data was extracted from the hospital database of 271 PCOS patients who underwent IVF in antagonist protocol triggered with GnRHa from August 2014 to December 2016. All cases with failure to obtain oocytes following retrieval were analyzed. Continuous variables were expressed as mean±SD using t-test and Chi-squared test for categorical variables. A p<0.05 was considered statistically significant.

RESULTS

Incidence of EFS following GnRHa trigger was found to be 3.3%. False empty follicle syndrome (FEFS) accounted for majority of the cases (8/9=88.8%). Of the nine EFS, six cases were salvaged with a rescue trigger, resulted in transfer of reasonably good quality embryos in a frozen-thawed embryo replacement cycle achieving clinical pregnancy in three cases (3/6=50%).

CONCLUSION

Our experience with EFS cases following GnRHa, albeit small, given the rarity of its occurrence, suggests that majority of EFS are of false forms and can be effectively salvaged which results in reasonably favorable outcome.

Empty follicle syndrome revisited: definition, incidence, aetiology, early diagnosis and treatment

In this review, the definition, incidence and possible causes of empty follicle syndrome (EFS), including molecular mechanisms that may underlie the syndrome, are discussed, along with prevention and treatment options. EFS is the complete failure to retrieve oocytes after ovarian stimulation, despite apparently normal follicle development and adequate follicular steroidogenesis. Two variants of EFS have been described: the 'genuine' form (gEFS), which occurs in the presence of adequate circulating HCG levels at the time of oocyte aspiration, and the 'false' form (f-EFS), which is associated with circulating HCG below a critical threshold. Heterogeneous HCG concentration thresholds, however, have been used to define gEFS, and to date no standardization exist. The situation is unclear when GnRH-analogues are used for ovulation trigger, as the threshold circulating LH and progesterone levels used to define EFS as 'genuine' are not established. The cause of fEFS has been clearly identified as an error in HCG administration at the time of ovulation trigger; in contrast, the cause of gEFS is still unclear, although some pathogenetic hypotheses have been proposed. Optimal treatment and prognosis of these patients are still poorly understood. Large, systematic multi-centre studies are needed to increase the understanding of EFS.