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Ozgur K, Tore H, Berkkanoglu M, Bulut H, Donmez L, Coetzee K. Comparable ongoing pregnancy and pregnancy loss rates in natural cycle and artificial cycle frozen embryo transfers with intensive method-specific luteal phase support; a retrospective cohort study. J Gynecol Obstet Hum Reprod 2024; 53:102797. [PMID: 38735575 DOI: 10.1016/j.jogoh.2024.102797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2024] [Revised: 05/08/2024] [Accepted: 05/08/2024] [Indexed: 05/14/2024]
Abstract
STUDY OBJECTIVE The absence of corpus lutea in artificial cycle (AC) frozen embryo transfers (FET) may increase the chances of pregnancy loss. In this retrospective cohort study, the efficacy of AC endometrial preparation was compared natural cycle (NC) endometrial preparation in terms of ongoing pregnancy. METHODS One thousand six hundred and eighteen consecutive vitrified-warmed blastocyst FET performed between December 2021 and November 2022 were included, with 1023 compared after exclusions according to the endometrial preparation method; 293 NC-FET, 143 modified NC-FET, 204 unprogrammed AC-FET, and 383 oral contraceptive pill (OCP) programmed AC-FET. Intensive method-specific luteal phase support (LPS) was administered in NC- (human chorionic gonadotropin and micronized vaginal progesterone), mNC- (micronized vaginal progesterone), and in AC-FET (micronized vaginal progesterone, intramuscular progesterone, and oral dydrogesterone). RESULTS Clinician choice of endometrial preparation method resulted in the NC- or AC-FET groups having distinct differences, with female age, antral follicle count and body mass index as well as the percentage of DOR or PCOS diagnosed patients significantly different. The unadjusted ongoing pregnancy and total pregnancy loss rates for NC-, mNC-, AC-, and ocp-AC-FET were 61.8 %, 55.2 %, 57.4 %, and 58.5 %, and 19.2 %, 24.0 %, 23.5 % and 23.8 %, respectively. In multivariate logistic regressions to predict the dependent outcomes of ongoing pregnancy and total pregnancy loss, none of the FET methods were selected as independent predictors. CONCLUSION Patients undergoing NC- and AC-FET with method-specific progesterone LPS had comparable ongoing pregnancy rates as well as total pregnancy loss rates, with NC-FET ranked first in the regression analysis.
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Affiliation(s)
| | - Hande Tore
- Antalya IVF Centre, Antalya, 07080, Turkey
| | - Murat Berkkanoglu
- Antalya IVF Centre, Antalya, 07080, Turkey; Istanbul Atlas University, School of Medicine, Department of Gynecology and Obstetrics, Istanbul 34408, Turkiye
| | - Hasan Bulut
- Antalya IVF Centre, Antalya, 07080, Turkey; Antalya Bilim University, School of Medicine, Department of Health Science, Antalya 07190, Turkiye
| | - Levent Donmez
- Akdeniz University, School of Medicine, Department of Public Health, Antalya, 07058, Turkiye
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Zaat T, de Bruin JP, Goddijn M, van Baal M, Benneheij S, Brandes M, Broekmans F, Cantineau A, Cohlen B, van Disseldorp J, Gielen S, Groenewoud E, van Heusden A, Kaaijk E, Koks C, de Koning C, Klijn N, van der Linden P, Manger P, Moolenaar L, van Oppenraaij R, Pieterse Q, Smeenk J, Visser J, van Wely M, Mol F. Home-based monitoring of ovulation to time frozen embryo transfers in the Netherlands (Antarctica-2): an open-label, nationwide, randomised, non-inferiority trial. Lancet 2023; 402:1347-1355. [PMID: 37678290 DOI: 10.1016/s0140-6736(23)01312-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 06/02/2023] [Accepted: 06/22/2023] [Indexed: 09/09/2023]
Abstract
BACKGROUND The growing field of assisted reproductive techniques, including frozen-thawed embryo transfer (FET), should lead the way to the best sustainable health care without compromising pregnancy chances. Correct timing of FET is crucial to allow implantation of the thawed embryo. Nowadays, timing based on hospital-controlled monitoring of ovulation in the natural cycle of a woman is the preferred strategy because of the assumption of favourable fertility prospects. However, home-based monitoring is a simple method to prevent patient travel and any associated environmental concerns. We compared ongoing pregnancy rates after home-based monitoring versus hospital-controlled monitoring with ovulation triggering. METHODS This open-label, multicentre, randomised, non-inferiority trial was undertaken in 23 hospitals and clinics in the Netherlands. Women aged between 18 and 44 years with a regular ovulatory menstrual cycle were randomly assigned in a 1:1 ratio via a web-based randomisation program to home-based monitoring or hospital-controlled monitoring. Those who analysed the data were masked to the groups; those collecting the data were not. All endpoints were analysed by intention to treat and per protocol. Non-inferiority was established when the lower limit of the 90% CI exceeded -4%. This study was registered at the Dutch Trial Register (Trial NL6414). FINDINGS 1464 women were randomly assigned between April 10, 2018, and April 13, 2022, with 732 allocated to home-based monitoring and 732 to hospital-controlled monitoring. Ongoing pregnancy occurred in 152 (20·8%) of 732 in the home-based monitoring group and in 153 (20·9%) of 732 in the hospital-controlled monitoring group (risk ratio [RR] 0·99 [90% CI 0·81 to 1·22]; risk difference [RD] -0·14 [90% CI -3·63 to 3·36]). The per-protocol analysis confirmed non-inferiority (152 [21·0%] of 725 vs 153 [21·0%] of 727; RR 1·00 (90% CI 0·81 to 1·23); RD -0·08 [90% CI -3·60 to 3·44]). INTERPRETATION Home-based monitoring of ovulation is non-inferior to hospital-controlled monitoring of ovulation to time FET. FUNDING The Dutch Organisation for Health Research and Development.
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Affiliation(s)
- Tjitske Zaat
- Department of Obstetrics and Gynaecology, Centre for Reproductive Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands; Amsterdam Reproduction and Development Research Institute, Amsterdam, Netherlands
| | - Jan-Peter de Bruin
- Department of Obstetrics and Gynaecology, Jeroen Bosch Ziekenhuis, 's-Hertogenbosch, Netherlands
| | - Mariëtte Goddijn
- Department of Obstetrics and Gynaecology, Centre for Reproductive Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands; Amsterdam Reproduction and Development Research Institute, Amsterdam, Netherlands
| | - Marchien van Baal
- Department of Obstetrics and Gynaecology, Flevoziekenhuis, Almere, Netherlands
| | - Sofie Benneheij
- Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynaecology, Erasmus MC, University Medical Centre Rotterdam, Rotterdam, Netherlands
| | - Monique Brandes
- Centre for Reproductive Medicine Nij Geertgen, Elsendorp, Netherlands
| | - Frank Broekmans
- Department of Reproductive Medicine, University Medical Centre Utrecht, Utrecht, Netherlands
| | - Astrid Cantineau
- Centre for Reproductive Medicine, University Medical Centre Groningen, Groningen, Netherlands
| | - Ben Cohlen
- Isala Fertility Centre, Isala Clinics, Zwolle, Netherlands
| | - Jeroen van Disseldorp
- Department of Obstetrics and Gynaecology, Sint Antonius Hospital, Nieuwegein, Netherlands
| | - Susanne Gielen
- Department of Obstetrics and Gynaecology, Franciscus Hospital, Rotterdam, Netherlands
| | - Eva Groenewoud
- Department of Obstetrics and Gynaecology, Noordwest Ziekenhuisgroep, Den Helder, Netherlands
| | | | - Eugenie Kaaijk
- Department of Obstetrics and Gynaecology, OLVG, Amsterdam, Netherlands
| | - Carolien Koks
- Department of Obstetrics and Gynaecology, Maxima Medical Centre, Veldhoven, Netherlands
| | - Corry de Koning
- Department of Obstetrics and Gynaecology, Tergooi Medical Centre, Blaricum, Netherlands
| | - Nicole Klijn
- Reproductive Centre, Leiden University Medical Centre, Leiden, Netherlands
| | - Paul van der Linden
- Department of Obstetrics and Gynaecology, Deventer Hospital, Deventer, Netherlands
| | - Petra Manger
- Department of Obstetrics and Gynaecology, Diakonessenhuis, Utrecht, Netherlands
| | - Lobke Moolenaar
- Department of Obstetrics and Gynaecology, Amsterdam UMC, Vrije Universiteit Amsterdam, Centre for Reproductive Medicine, Amsterdam, Netherlands
| | | | - Quirine Pieterse
- Department of Obstetrics and Gynaecology, Haga Ziekenhuis, Den Haag, Netherlands
| | - Jesper Smeenk
- Department of Obstetrics and Gynaecology, Elisabeth-TweeSteden Ziekenhuis, Tilburg, Netherlands
| | - Jantien Visser
- Department of Obstetrics and Gynaecology, Amphia Ziekenhuis, Breda, Netherlands
| | - Madelon van Wely
- Department of Obstetrics and Gynaecology, Centre for Reproductive Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands; Amsterdam Reproduction and Development Research Institute, Amsterdam, Netherlands
| | - Femke Mol
- Department of Obstetrics and Gynaecology, Centre for Reproductive Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands; Amsterdam Reproduction and Development Research Institute, Amsterdam, Netherlands.
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Holder KN, Mormol JS, Bakkensen JB, Pavone ME, Goldman KN, Yeh C, Muhammad LN, Bernardi LA. Natural Cycle Frozen Embryo Transfer: Evaluating Optimal Protocols for Preparation and Timing. J Hum Reprod Sci 2023; 16:333-339. [PMID: 38322641 PMCID: PMC10841927 DOI: 10.4103/jhrs.jhrs_125_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Revised: 12/05/2023] [Accepted: 12/11/2023] [Indexed: 02/08/2024] Open
Abstract
Background While natural cycle frozen embryo transfer (NC-FET) is becoming increasingly common, significant practice variation exists in the use of ovulation induction medications, administration of ovulation trigger, and timing of embryo transfer without consensus as to the optimal protocol. Aims The objective of this study is to evaluate the association of key aspects of the NC-FET protocol with implantation, pregnancy and live birth. Settings and Design This was a retrospective cohort study of blastocyst stage NC-FET cycles from October 2019 to July 2021 at a single academic fertility centre. Materials and Methods Protocols varied between cycles across three key parameters which were evaluated as primary predictors of cycle outcomes: (1) use of letrozole for mild ovarian stimulation/ovulation induction, (2) administration of exogenous ovulation trigger versus spontaneous luteinising hormone surge and (3) transfer timing based on ovulation trigger versus sequential progesterone monitoring. Primary outcomes included implantation rate, clinical pregnancy and ongoing pregnancy. Statistical Analysis Used Generalised estimating equations were fitted to obtain adjusted odds ratios or rate ratios as appropriate with 95% confidence intervals for each outcome across the three primary predictors. Results A total of 183 cycles from 170 unique patients were eligible for inclusion. The average implantation rate was 0.58, resulting in an overall clinical pregnancy and ongoing pregnancy rate of 59.0% and 51.4%, respectively. After adjusting for age at embryo freeze and history of a failed embryo transfer, there were no significant associations between any predictor and implantation rate, clinical pregnancy, ongoing pregnancy, or live birth. Conclusion In NC-FET, a variety of preparation and timing protocols may lead to comparable cycle outcomes, potentially allowing for flexibility on the basis of patient and physician preference. These findings warrant validation in a larger, randomised trial.
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Affiliation(s)
- Kai N. Holder
- Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Jessica S. Mormol
- Department of Obstetrics and Gynecology, The Ohio State University, Columbus, OH, USA
| | - Jennifer B. Bakkensen
- Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Mary Ellen Pavone
- Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Kara N. Goldman
- Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Chen Yeh
- Department of Preventive Medicine, Division of Biostatistics, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Lutfiyya N. Muhammad
- Department of Preventive Medicine, Division of Biostatistics, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
| | - Lia A. Bernardi
- Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, Northwestern University Feinberg School of Medicine, Chicago, IL, USA
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Bilgory A, Atzmon Y, Aslih N, Shibli Abu Raya Y, Sharqawi M, Shavit M, Estrada D, Shalom-Paz E. Ovulatory-cycle frozen embryo transfer: spontaneous or triggered ovulation and the impact of LH elevation at hCG triggering. Sci Rep 2023; 13:7195. [PMID: 37137911 PMCID: PMC10156802 DOI: 10.1038/s41598-023-34017-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 04/22/2023] [Indexed: 05/05/2023] Open
Abstract
The effect of the luteinizing hormone (LH) elevation before the human chorionic gonadotropin (hCG) trigger in ovulatory frozen-thawed embryo transfer (Ovu-FET) cycles has not been determined. We aimed to investigate whether triggering ovulation in Ovu-FET cycles affects the live birth rate (LBR), and the contribution of elevated LH at the time of hCG trigger. This retrospective study included Ovu-FET cycles performed in our center from August 2016 to April 2021. Modified Ovu-FET (hCG trigger) and true Ovu-FET (without hCG trigger) were compared. The modified group was divided according to whether hCG was administered, before or after LH increased to > 15 IU/L and was twice the baseline value. The modified (n = 100) and true (n = 246) Ovu-FET groups and both subgroups of the modified Ovu-FET, those who were triggered before (n = 67) or after (n = 33) LH elevation, had comparable characteristics at baseline. Comparison of true vs. modified Ovu-FET outcomes revealed similar LBR (35.4% vs. 32.0%; P = 0.62), respectively. LBR were similar between the modified Ovu-FET subgroups regardless of the hCG trigger timing (31.3% before vs. 33.3% after LH elevation; P = 0.84). In conclusion, LBR of Ovu-FET were not affected by hCG trigger or whether LH was elevated at the time of hCG trigger. These results add reassurance regarding hCG triggering even after LH elevation.
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Affiliation(s)
- Asaf Bilgory
- IVF Unit, Department of Obstetrics and Gynecology, Hillel Yaffe Medical Center, Hadera, Israel.
- Ruth and Bruce Rappaport School of Medicine, The Technion Institute of Technology, Haifa, Israel.
| | - Yuval Atzmon
- IVF Unit, Department of Obstetrics and Gynecology, Hillel Yaffe Medical Center, Hadera, Israel
- Ruth and Bruce Rappaport School of Medicine, The Technion Institute of Technology, Haifa, Israel
| | - Nardin Aslih
- IVF Unit, Department of Obstetrics and Gynecology, Hillel Yaffe Medical Center, Hadera, Israel
- Ruth and Bruce Rappaport School of Medicine, The Technion Institute of Technology, Haifa, Israel
| | - Yasmin Shibli Abu Raya
- IVF Unit, Department of Obstetrics and Gynecology, Hillel Yaffe Medical Center, Hadera, Israel
- Ruth and Bruce Rappaport School of Medicine, The Technion Institute of Technology, Haifa, Israel
| | - Moamina Sharqawi
- IVF Unit, Department of Obstetrics and Gynecology, Hillel Yaffe Medical Center, Hadera, Israel
- Ruth and Bruce Rappaport School of Medicine, The Technion Institute of Technology, Haifa, Israel
| | - Maya Shavit
- IVF Unit, Department of Obstetrics and Gynecology, Hillel Yaffe Medical Center, Hadera, Israel
- Ruth and Bruce Rappaport School of Medicine, The Technion Institute of Technology, Haifa, Israel
| | - Daniela Estrada
- IVF Unit, Department of Obstetrics and Gynecology, Hillel Yaffe Medical Center, Hadera, Israel
- Ruth and Bruce Rappaport School of Medicine, The Technion Institute of Technology, Haifa, Israel
| | - Einat Shalom-Paz
- IVF Unit, Department of Obstetrics and Gynecology, Hillel Yaffe Medical Center, Hadera, Israel
- Ruth and Bruce Rappaport School of Medicine, The Technion Institute of Technology, Haifa, Israel
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Jiang WJ, Sun ZG, Song JY. Premature timing of progesterone luteal phase support initiation did not negatively impact live birth rates in modified natural frozen thawed embryo transfer cycles. Heliyon 2023; 9:e13218. [PMID: 36793963 PMCID: PMC9922970 DOI: 10.1016/j.heliyon.2023.e13218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 01/20/2023] [Accepted: 01/20/2023] [Indexed: 01/26/2023] Open
Abstract
Study question In a modified natural cycle frozen-thawed embryo transfer (mNC-FET), does the premature timing of progesterone luteal phase support (LPS) initiation 24 h following human chorionic gonadotropin (hCG) trigger impact live birth? Summary answer Premature LPS initiation did not negatively affect the live birth rate (LBR) in mNC-FET cycles compared with conventional LPS initiation 48 h after hCG triggering. What is known already During natural cycle FET, human chorionic gonadotropin is routinely used to mimic endogenous luteinizing hormone (LH) surge to induce ovulation, which allows more flexibility in embryo transfer scheduling, thus relieving the burden of multiple visits by patients and laboratory workloads, which is also known as mNC-FET. Moreover, recent data demonstrates that ovulatory women undergoing natural cycle FETs have a lower risk of maternal and fetal complications due to the essential role of the corpus luteum in implantation, placentation and pregnancy maintenance. While several studies have confirmed the positive effects of LPS in mNC-FETs, the timing of progesterone LPS initiation is still unclear, as compared with fresh cycles where robust research has been conducted. To the best of our knowledge, no clinical studies comparing different beginning days in mNC-FET cycles have been published. Study design size duration This retrospective cohort study involved 756 mNC-FET cycles performed at a university-affiliated reproductive center between January 2019 and August 2021. The primary outcome measured was the LBR. Participants/materials setting methods Ovulatory women ≤42 years of age who were referred for their autologous mNC-FET cycles were included in the study. According to the timing of progesterone LPS initiation following the hCG trigger, patients were assigned into two categories: premature LPS group (progesterone initiation 24 h after hCG trigger, n = 182) versus conventional LPS group (progesterone initiation 48 h after hCG trigger, n = 574). Multivariate logistic regression analysis was used to control for confounding variables. Main results and the role of chance There were no differences in background characteristics between the two study groups, except for the proportion of assisted hatching (53.8% in premature LPS group versus 42.3% in conventional LPS group, p = 0.007). In the premature LPS group, 56 of 182 patients (30.8%) had a live birth, compared to 179 of 574 patients (31.2%) in the conventional LPS group, with no significant difference observed between groups (adjusted odds ratio [aOR] 0.98, 95% confidence interval [CI] 0.67-1.43, p = 0.913). In addition, there was no significant difference between the two groups in other secondary outcomes. A sensitivity analysis for LBR according to the serum LH and progesterone levels on hCG trigger day also confirmed the aforementioned findings. Limitations reasons for caution In this study, retrospective analysis was conducted in a single center and was therefore prone to bias. Additionally, we did not anticipate monitoring the patient's follicle rupture and ovulation after hCG triggering. Future prospective clinical trials remain necessary to confirm our results. Wider implications of the findings While exogenous progesterone LPS was added 24 h after hCG triggering, embryo-endometrium synchrony would not be adversely affected so long as sufficient time was allowed for endometrial exposure to exogenous progesterone. Our data support promising clinical outcomes following this event. As a result of our findings, clinicians and patients will be able to make better informed decisions. Study funding/competing interests No specific funding was available for this study. The authors have no personal conflicting interests to declare. Trial registration number N/A.
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Affiliation(s)
- Wen-Jing Jiang
- The First Clinical College, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Zhen-Gao Sun
- Reproductive Center of Integrated Medicine, The Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China,Corresponding author.
| | - Jing-Yan Song
- The First Clinical College, Shandong University of Traditional Chinese Medicine, Jinan, China,Reproductive Center of Integrated Medicine, The Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China,Corresponding author. The First Clinical College, Shandong University of Traditional Chinese Medicine, Jinan, China.
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Aydin T, Namli Kalem M, Bakirarar B, Aygun EG, Kalem Z. Comparing the success rate of natural cycle and modified natural cycle protocols for frozen-thawed embryo transfer. Gynecol Endocrinol 2022; 38:1073-1078. [PMID: 36220075 DOI: 10.1080/09513590.2022.2128747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
Abstract
Objective: The aim of the present study is to compare the effects of Natural Cycle and modified Natural Cycle protocols for frozen-thawed embryo transfer on clinical pregnancy rate and live birth rate. Methods: This prospective randomized controlled trial comprised 145 patients scheduled for frozen-thawed embryo transfer and was conducted at a university hospital between 2019 and 2021. The Natural Cycle protocol was administered to 73 patients and the modified Natural Cycle protocol to 72 patients and the clinical outcome was compared between the groups. The main outcome measure was live birth rate. Results: Baseline characteristics and cycle parameters were similar in both groups. There was no difference in clinical pregnancy rate (58.9% and 54.2%, respectively; p = .565) and live birth rate between the Natural Cycle and modified Natural Cycle groups (49.3% and 48.6% respectively; p = .932). Conclusion: This study established that clinical pregnancy and live birth rates were not affected by natural cycle ovulation being spontaneous or hCG-triggered among patients undergoing frozen-thawed embryo transfer. Thus, the protocol for natural cycle frozen-thawed embryo transfers should be chosen according to the priorities of the patient and the physician.
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Affiliation(s)
- Turgut Aydin
- Department of IVF, Acıbadem University Atakent Hospital, Istanbul, Turkey
| | - Muberra Namli Kalem
- Department of IVF, Istinye University Liv Bahcesehir Hospital, Istanbul, Turkey
| | - Batuhan Bakirarar
- Department of Biostatistics, Ankara University Faculty of Medicine, Ankara, Turkey
| | - Elif Ganime Aygun
- Department of IVF, Acıbadem University Atakent Hospital, Istanbul, Turkey
| | - Ziya Kalem
- Department of IVF, Istinye University Liv Bahcesehir Hospital, Istanbul, Turkey
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Ye H, Shi L, Quan X, Xue X, Qian Y, Tian H, Xue S, Sun L. Frozen-thawed embryo transfer in modified natural cycles: a retrospective analysis of pregnancy outcomes in ovulatory women with vs. without spontaneous luteinizing hormone surge. BMC Pregnancy Childbirth 2022; 22:814. [PMCID: PMC9635083 DOI: 10.1186/s12884-022-05161-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2021] [Accepted: 10/26/2022] [Indexed: 11/06/2022] Open
Abstract
Background Timing of frozen embryo transfer (FET) in natural endometrial preparation cycles is often based on luteinizing hormone (LH) surge. However, some patients do not show spontaneous LH surge despite follicular maturation. The objective of this study was to evaluate the impact of spontaneous LH surge on pregnancy outcomes in modified natural cycles (mNC). Methods This retrospective analysis included 1897 FET cycles with modified natural endometrial preparation in normo-ovulatory women between January 1, 2015, to December 31, 2019, at our center: 920 cycles with spontaneous LH surge (≥ 20 IU/L) and 977 without. For cleavage embryos, FET was conducted 4 and 5 days after hCG injection in women with and without LH surge, respectively. For blastocysts, FET was conducted 6 and 7 days after hCG injection in women with and without LH surge, respectively. Multivariate regression was conducted to examine the factors associated with live birth. Results Live birth rate was 43.7% in patients with spontaneous LH surge vs. 43.8% in women without LH surge (P = 0.961). The two groups also had similar implantation rate (36.2% vs. 36.7%, P = 0.772), biochemical pregnancy rate (54.8% vs. 55.4%, P = 0.796) and clinical pregnancy rate (50.9% vs. 51.7%, P = 0.721). In multivariate regression, live birth was not associated with LH surge (aOR, 0.947, 95% CI, 0.769, 1.166). Conclusion Pregnancy outcomes were similar in mNC-FET in cycles with vs. without spontaneous LH surge if FET timing is adjusted.
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Affiliation(s)
- Hongjuan Ye
- grid.24516.340000000123704535School of Life Sciences and Technology, Tongji University, Shanghai, China ,grid.24516.340000000123704535Department of Reproductive Medicine Center, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Liya Shi
- grid.24516.340000000123704535Department of Reproductive Medicine Center, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Xinxin Quan
- grid.24516.340000000123704535Department of Reproductive Medicine Center, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Xue Xue
- grid.24516.340000000123704535Department of Reproductive Medicine Center, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Ying Qian
- grid.24516.340000000123704535Department of Reproductive Medicine Center, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Hui Tian
- grid.24516.340000000123704535Department of Reproductive Medicine Center, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Songguo Xue
- grid.24516.340000000123704535Department of Reproductive Medicine Center, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Lihua Sun
- grid.24516.340000000123704535Department of Reproductive Medicine Center, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
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Roelens C, Blockeel C. Impact of different endometrial preparation protocols before frozen embryo transfer on pregnancy outcomes: a review. Fertil Steril 2022; 118:820-827. [PMID: 36273850 DOI: 10.1016/j.fertnstert.2022.09.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 09/06/2022] [Accepted: 09/06/2022] [Indexed: 01/13/2023]
Abstract
The use of frozen embryo transfer cycles has exponentially increased in the last few years. Optimization of endometrial preparation protocols before frozen embryo transfer is mandatory to further improve pregnancy outcomes. This review will focus on the existing literature with regard to the different available endometrial preparation protocols and their impact on pregnancy outcomes. More specifically, we will focus on programmed, natural, and stimulated frozen embryo transfer cycles. The studies performed on this topic are generally of low quality, and only a few well-performed randomized controlled trials have been published. To date, no strong evidence is available to support the use of 1 preparation method over another in terms of pregnancy outcomes. However, robust data have shown a clearly protective effect of natural frozen embryo transfer cycles against long-term obstetric complications, mainly hypertensive disorders of pregnancy and large for gestational age infants. The introduction of individualized luteal phase support in different endometrial preparation protocols is actually gaining a lot of attention and requires further investigation.
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Affiliation(s)
- Caroline Roelens
- Brussels IVF, Universitair Ziekenhuis Brussel, Brussels, Belgium.
| | - Christophe Blockeel
- Brussels IVF, Universitair Ziekenhuis Brussel, Brussels, Belgium; Department of Obstetrics and Gynaecology, School of Medicine, University of Zagreb, Zagreb, Croatia
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Pregnancy outcomes after frozen-thawed embryo transfer using letrozole ovulation induction, natural, or programmed cycles. Fertil Steril 2022; 118:690-698. [PMID: 35863997 DOI: 10.1016/j.fertnstert.2022.06.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 06/10/2022] [Accepted: 06/13/2022] [Indexed: 01/13/2023]
Abstract
OBJECTIVE To evaluate and compare pregnancy outcomes between letrozole ovulation induction, natural, and programmed frozen-thawed embryo transfer (FET) cycles in a population based in the United States. DESIGN Retrospective cohort study. SETTING Single university-affiliated infertility practice. PATIENT(S) A total of 3,148 FET cycles consisting of patients aged ≤45 years transferring blastocysts that were created from autologous oocytes between January 2015 and July 2021. INTERVENTION(S) None. MAIN OUTCOME MEASURE(S) The primary outcome was the ongoing pregnancy rate (OPR) or live birth rate (LBR). The secondary outcomes included clinical pregnancy and clinical loss rates (CLRs). RESULT(S) The OPR/LBR was higher among letrozole FETs than among programmed FETs (adjusted risk ratio [aRR] 1.11, 95% confidence interval [CI] 1.02-1.21) but comparable to natural FETs (aRR 1.05, 95% CI 0.96-1.14). The OPR/LBR was comparable between natural and programmed FETs (aRR 1.06, 95% CI 0.99-1.13). The CLR was lower in the natural FET group than in the programmed FET group (aRR 0.62, 95% CI 0.46-0.84). There were no differences in CLRs between letrozole and programmed FETs and between letrozole and natural FETs. Among ovulatory women, the OPR/LBR among letrozole FETs was higher than that among programmed FETs (aRR 1.16, 95% CI 1.05-1.28). The CLR among ovulatory women was significantly lower in both letrozole FETs (aRR 0.44, 95% CI 0.22-0.87) and natural FETs (aRR 0.59, 95% CI 0.43-0.80) than in programmed FETs. Among anovulatory women, the OPR/LBR in the letrozole FET group was similar to that in the programmed FET group (aRR 0.95, 95% CI 0.79-1.13). CONCLUSION(S) Letrozole and natural FET clinical outcomes were improved compared with programmed FET outcomes.
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Greenbaum S, Athavale A, Hershko Klement A, Bentov Y. Luteal phase support in fresh and frozen embryo transfers. FRONTIERS IN REPRODUCTIVE HEALTH 2022; 4:919948. [PMID: 36303666 PMCID: PMC9580718 DOI: 10.3389/frph.2022.919948] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 06/28/2022] [Indexed: 11/13/2022] Open
Abstract
ContextLuteal phase support (LPS) has become an essential component of IVF protocols following both fresh and frozen embryo transfers, yet there is still controversy with regards to the optimal protocol of LPS to enhance treatment outcome.Search strategyA search via PubMed for all the selected topics was limited to publications from the past 10 years and to English language. We subsequently searched the reference lists of retrieved articles. Where available, RCTs were chosen over non-randomized studies. Here we provide an updated review of the current literature on various issues relating to LPS, in both fresh and frozen embryo transfers. The timing of LPS initiation as well as the route of administration and dosing are discussed for both fresh and frozen transfers. A separate discussion for frozen thawed embryo transfer in natural cycles and non-ovulatory cycles is presented.ConclusionsWe present data that supports the use of Progesterone LPS in fresh and frozen embryo transfers. No benefits were found to the addition of hCG or estradiol to progesterone LPS in fresh transfers, however GnRH agonist may have a role. IM Progesterone was not advantageous over vaginal progesterone in fresh transfers but was superior in frozen transfers. The timing of LPS introduction, the interval to embryo transfer, as well as the serum concentration of progesterone, have significant effects on the success of the treatment.
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Affiliation(s)
- Shirley Greenbaum
- Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
- Division of Obstetrics and Gynecology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
- Department of Obstetrics and Gynecology, Hadassah Mount Scopus-Hebrew University Medical Center, Jerusalem, Israel
| | - Ahlad Athavale
- Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
- Division of Obstetrics and Gynecology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
- Department of Obstetrics and Gynecology, Hadassah Mount Scopus-Hebrew University Medical Center, Jerusalem, Israel
| | - Anat Hershko Klement
- Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
- Division of Obstetrics and Gynecology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
- Department of Obstetrics and Gynecology, Hadassah Mount Scopus-Hebrew University Medical Center, Jerusalem, Israel
| | - Yaakov Bentov
- Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
- Division of Obstetrics and Gynecology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
- Department of Obstetrics and Gynecology, Hadassah Mount Scopus-Hebrew University Medical Center, Jerusalem, Israel
- *Correspondence: Yaakov Bentov
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Timing of warmed blastocyst transfer related to luteinizing hormone surge in the true natural cycle and its impact on ongoing pregnancy rates. Reprod Biomed Online 2022; 45:440-447. [DOI: 10.1016/j.rbmo.2022.04.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 04/06/2022] [Accepted: 04/26/2022] [Indexed: 11/22/2022]
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12
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Can endocrine characteristics of early pregnancy following natural cycle cryopreserved embryo transfer predict live birth? Reprod Biomed Online 2022; 44:1134-1141. [DOI: 10.1016/j.rbmo.2022.02.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 12/18/2021] [Accepted: 02/22/2022] [Indexed: 11/23/2022]
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13
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Mensing L, Dahlberg ES, Bay B, Gabrielsen A, Knudsen UB. Endometrial preparation methods prior to frozen embryo transfer: A retrospective cohort study comparing true natural cycle, modified natural cycle and artificial cycle. Arch Gynecol Obstet 2022; 306:1381-1388. [PMID: 35094106 PMCID: PMC9470615 DOI: 10.1007/s00404-021-06371-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 12/15/2021] [Indexed: 11/29/2022]
Abstract
Purpose The aim of this study was to compare the outcomes of three endometrial preparation methods prior to frozen embryo transfer (FET): Natural cycle (NC), modified natural cycle (mNC), and programmed/artificial cycle (AC) protocols. Primary outcomes investigated were clinical pregnancy rate (CPR) and live birth rate (LBR). Methods A retrospective study on 2080 FET cycles including patients ≤ 35 years with a BMI ≤ 30 who underwent FET with a single autologous blastocyst stage embryo at Aarhus University Hospital or Horsens Regional Hospital in the period 2013–2019. Only blastocysts frozen by vitrification were included. No luteal phase support (LPS) was used in natural cycles. Results In NC, mNC and AC, CPRs were 34.9%, 40.6% and 32.0%, while LBRs were 32.3%, 36.3% and 26.6%, respectively. There were no significant differences in main outcomes when comparing AC with NC [LBR: OR = 0.9 (0.6; 1.2), p = 0.4]. Compared to NC, mNC-FET displayed significantly higher positive hCG, implantation rate, CPR and LBR [LBR: OR = 1.4 (1.0; 1.9), p = 0.03]. An analysis with mNC as reference group demonstrated significantly better outcomes in the mNC group compared to AC [LBR: OR 0.6 (0.5; 0.8), p = < 0.01]. Conclusion The present study overall demonstrated better outcomes including LBR with mNC protocol as compared to NC and AC protocol, while comparison of AC and NC showed both protocols to be equally effective. A programmed cycle may be necessary for women with anovulatory cycles; however, normo-ovulating women may be offered a natural cycle protocol. Trial registration number 3-3013-3047/1 and 31-1522-44. Date of registration: June 24, 2019 and April 23, 2020.
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Affiliation(s)
- Lena Mensing
- Fertility Clinic, Horsens Regional Hospital, Sundvej 30, 8700, Horsens, Denmark.
| | - Emilie S Dahlberg
- Fertility Clinic, Horsens Regional Hospital, Sundvej 30, 8700, Horsens, Denmark
| | - Bjørn Bay
- Fertility Clinic, Horsens Regional Hospital, Sundvej 30, 8700, Horsens, Denmark
| | - Anette Gabrielsen
- Fertility Clinic, Horsens Regional Hospital, Sundvej 30, 8700, Horsens, Denmark
| | - Ulla B Knudsen
- Fertility Clinic, Horsens Regional Hospital, Sundvej 30, 8700, Horsens, Denmark
- Department of Clinical Medicine, Aarhus University, Palle Juul-Jensens Boulevard 82, Aarhus N, 8200, Aarhus, Denmark
- Department of Obstetrics and Gynecology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, Aarhus N, 8200, Aarhus, Denmark
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14
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Lovrec VG, Kozar N, Reljic M. Outcome of vitrified-warmed blastocyst transfer performed on days 5–7 after urine LH detection. Reprod Biomed Online 2021; 44:630-635. [DOI: 10.1016/j.rbmo.2021.12.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 11/26/2021] [Accepted: 12/02/2021] [Indexed: 11/16/2022]
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15
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Gao DD, Li L, Zhang Y, Wang XX, Song JY, Sun ZG. Is Human Chorionic Gonadotropin Trigger Beneficial for Natural Cycle Frozen-Thawed Embryo Transfer? Front Med (Lausanne) 2021; 8:691428. [PMID: 34722559 PMCID: PMC8551612 DOI: 10.3389/fmed.2021.691428] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Accepted: 09/22/2021] [Indexed: 12/02/2022] Open
Abstract
Objective: The aim of this study is to investigate, in ovulatory patients, whether there is a difference in reproductive outcomes following frozen-thawed embryo transfer (FET) in natural cycles (NC) compared to modified natural cycles (mNC). Methods: This retrospective cohort study, performed at the public tertiary fertility clinic, involved all infertile patients undergoing endometrial preparation prior to FET in NC and mNC from January, 2017 to November, 2020. One thousand hundred and sixty-two patients were divided into two groups: mNC group (n = 248) had FET in a NC after ovulation triggering with human chorionic gonadotropin (hCG); NC group (n = 914) had FET in a NC after spontaneous ovulation were observed. The primary outcome was live birth rate. All pregnancy outcomes were analyzed by propensity score matching (PSM) and multivariable logistic regression analyses. Results: The NC group showed a higher live birth rate [344/914 (37.6%) vs. 68/248 (27.4%), P = 0.003; 87/240 (36.3%) vs. 66/240 (27.5%), P = 0.040] than the mNC group before and after PSM analysis. Multivariable analysis also showed mNC to be associated with a decreased likelihood of live birth compared with NC [odds ratio (OR) 95% confidence interval (CI) 0.71 (0.51–0.98), P = 0.039]. Conclusion: For women with regular menstrual cycles, NC-FET may have a higher chance of live birth than that in the mNC-FET cycles. As a consequence, it's critical to avoid hCG triggering as much as possible when FETs utilize a natural cycle strategy for endometrial preparation. Nevertheless, further more well-designed randomized clinical trials are still needed to determine this finding.
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Affiliation(s)
- Dan-Dan Gao
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Li Li
- The First Clinical College, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Yi Zhang
- College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Xiao-Xuan Wang
- Reproductive and Genetic Center of Integrated Medicine, The Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Jing-Yan Song
- The First Clinical College, Shandong University of Traditional Chinese Medicine, Jinan, China.,Reproductive and Genetic Center of Integrated Medicine, The Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Zhen-Gao Sun
- The First Clinical College, Shandong University of Traditional Chinese Medicine, Jinan, China.,Reproductive and Genetic Center of Integrated Medicine, The Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
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Bergenheim SJ, Saupstad M, Pistoljevic N, Lyng Forman J, Larsen EC, Bogstad JW, Fynbo M, Hashem N, Freiesleben NLC, Nøhr B, Andersen LF, Humaidan P, Ziebe S, Pinborg AB, Løssl K. Immediate versus postponed single blastocyst transfer in modified natural cycle frozen embryo transfer (mNC-FET): a study protocol for a multicentre randomised controlled trial. BMJ Open 2021; 11:e053234. [PMID: 34706963 PMCID: PMC8552140 DOI: 10.1136/bmjopen-2021-053234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
INTRODUCTION Today, it is widespread practice to postpone frozen embryo transfer (FET) in a modified natural cycle (mNC) for at least one menstrual cycle after oocyte retrieval and failed fresh embryo transfer or freeze-all. The rationale behind this practice is the concern that suboptimal ovarian, endometrial or endocrinological conditions following ovarian stimulation may have a negative impact on endometrial receptivity and implantation. However, two recent systematic reviews and meta-analyses based on retrospective data did not support this practice. As unnecessary delay in time to transfer and pregnancy should be avoided, the aim of this study is to investigate if immediate single blastocyst transfer in mNC-FET is non-inferior to standard postponed single blastocyst transfer in mNC-FET in terms of live birth rate. METHODS AND ANALYSIS Multicentre randomised controlled non-blinded trial including 464 normo-ovulatory women aged 18-40 years undergoing single blastocyst mNC-FET after a failed fresh or freeze-all cycle. Participants are randomised 1:1 to either FET in the first menstrual cycle following the stimulated cycle (immediate FET) or FET in the second or subsequent cycle following the stimulated cycle (postponed FET). The study is designed as a non-inferiority trial and primary analyses will be performed as intention to treat and per protocol. ETHICS AND DISSEMINATION Ethical approval has been granted by the Scientific Ethical Committee of the Capital Region of Denmark (J-nr.: H-19086300). Data will be handled according to Danish law on personal data protection in accordance with the general data protection regulation. Participants will complete written consent forms regarding participation in the study and storage of blood samples in a biobank for future research. The study will be monitored by a Good Clinical Practice (GCP)-trained study nurse not otherwise involved in the study. The results of this study will be disseminated by publication in international peer-reviewed scientific journals. TRIAL REGISTRATION NUMBER NCT04748874; Pre-results.
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Affiliation(s)
- Sara Johanna Bergenheim
- Fertility Department 4071, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Marte Saupstad
- Fertility Department 4071, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Nina Pistoljevic
- Fertility Department 4071, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Julie Lyng Forman
- Department of Public Health, Section of Biostatistics, University of Copenhagen, Copenhagen, Denmark
| | - Elisabeth Clare Larsen
- Fertility Department 4071, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Jeanette Wulff Bogstad
- Fertility Department 4071, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Malene Fynbo
- Fertility Department 4071, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Nadia Hashem
- Fertility Department 4071, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Nina La Cour Freiesleben
- Department of Obstetrics and Gynaecology, Fertility Clinic, Hvidovre Hospital, Copenhagen University Hospital, Copenhagen, Denmark
| | - Bugge Nøhr
- Department of Obstetrics and Gynaecology, Fertility Clinic, Herlev Hospital, Copenhagen University Hospital, Copenhagen, Denmark
| | - Lars Franch Andersen
- Department of Obstetrics and Gynaecology, Fertility Clinic, Hillerød Hospital, Copenhagen University Hospital, Copenhagen, Denmark
| | - Peter Humaidan
- Department of Obstetrics and Gynaecology, Fertility Clinic, Skive Regional Hospital, Aarhus University Hospital, Aarhus, Denmark
| | - Soren Ziebe
- Fertility Department 4071, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Anja Bisgaard Pinborg
- Fertility Department 4071, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
| | - Kristine Løssl
- Fertility Department 4071, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
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Jin Z, Shi H, Bu Z, Guo Y, Su Y, Song H, Huo M, Yang E, Li J, Zhang Y. Live birth rates after natural cycle versus hormone replacement therapy for single euploid blastocyst transfers: a retrospective cohort study. Reprod Biomed Online 2021; 43:1002-1010. [PMID: 34740515 DOI: 10.1016/j.rbmo.2021.09.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 08/28/2021] [Accepted: 09/06/2021] [Indexed: 11/16/2022]
Abstract
RESEARCH QUESTION Is there any difference in live birth rate between the natural cycle and hormone replacement therapy (HRT) endometrial preparation protocols for women with regular menstrual cycles undergoing their first single vitrified-warmed euploid blastocyst transfer? DESIGN This was a retrospective cohort study that enrolled 722 women who underwent vitrified-warmed euploid blastocyst transfer at assisted reproductive technology (ART) centre of The First Affiliated Hospital of Zhengzhou University, from January 2013 to December 2019. Univariate and multivariate logistic regression models were used to analyse the relationship between the endometrial preparation protocols and live birth rates. Stratified analyses and sensitivity analyses were performed to ensure the reliability and stability of the results. RESULTS A total of 722 single vitrified-warmed euploid blastocyst transfer cycles were included. Overall, the live birth rates were 50.00% (110/220) in the natural cycle group and 47.61% (239/502) in the HRT group. Multiple logistic regression analyses showed that there was no significant association (adjusted odds ratio 0.82; 95% confidence interval 0.56-1.20; P = 0.313) between natural cycle and HRT protocols and the live birth rate. Interaction analysis showed that there was no significant difference in live birth rates between the two groups for any subgroup after adjusting for confounding factors. CONCLUSIONS For single vitrified-warmed euploid blastocyst transfer, natural cycle and HRT endometrial preparation protocols result in similar live birth rates among women with regular menstrual cycles. Further studies are needed into the effects of endometrial preparation protocols on pregnancy outcomes.
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Affiliation(s)
- Ziqi Jin
- Reproductive Medical Center, Henan Province Key Laboratory for Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou Henan Province, China
| | - Hao Shi
- Reproductive Medical Center, Henan Province Key Laboratory for Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou Henan Province, China
| | - Zhiqin Bu
- Reproductive Medical Center, Henan Province Key Laboratory for Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou Henan Province, China
| | - Yihong Guo
- Reproductive Medical Center, Henan Province Key Laboratory for Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou Henan Province, China
| | - Yingchun Su
- Reproductive Medical Center, Henan Province Key Laboratory for Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou Henan Province, China
| | - Hui Song
- Reproductive Medical Center, Henan Province Key Laboratory for Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou Henan Province, China
| | - Mingzhu Huo
- Reproductive Medical Center, Henan Province Key Laboratory for Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou Henan Province, China
| | - Entong Yang
- Reproductive Medical Center, Henan Province Key Laboratory for Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou Henan Province, China
| | - Jingdi Li
- Reproductive Medical Center, Henan Province Key Laboratory for Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou Henan Province, China
| | - Yile Zhang
- Reproductive Medical Center, Henan Province Key Laboratory for Reproduction and Genetics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou Henan Province, China.
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The effect of late-follicular phase progesterone elevation on embryo ploidy and cumulative live birth rates. Reprod Biomed Online 2021; 43:1063-1069. [PMID: 34654613 DOI: 10.1016/j.rbmo.2021.07.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Revised: 07/27/2021] [Accepted: 07/29/2021] [Indexed: 11/23/2022]
Abstract
RESEARCH QUESTION Does late-follicular phase progesterone elevation have a deleterious effect on embryo euploidy, blastocyst formation rate and cumulative live birth rates (CLBR)? DESIGN A multicentre retrospective cross-sectional study including infertile patients aged 18-40 years who underwent ovarian stimulation in a gonadotrophin-releasing hormone antagonist protocol and preimplantation genetic testing for aneuploidies (PGT-A) followed by a freeze-all strategy and euploid embryo transfer between August 2017 and December 2019. The sample was stratified according to the progesterone concentrations on the day of trigger: normal (≤1.50 ng/ml) and high (>1.50 ng/ml). Moreover, sensitivity analyses were performed to determine whether different conclusions would have been drawn if different cut-offs had been adopted. The primary outcome was the embryo euploidy rate. Secondary outcomes were the blastocyst formation rate, the number of euploid blastocysts and CLBR. RESULTS Overall 1495 intracytoplasmic sperm injection PGT-A cycles were analysed. Late-follicular phase progesterone elevation was associated with significantly higher late-follicular oestradiol concentrations (2847.56 ± 1091.10 versus 2240.94 ± 996.37 pg/ml, P < 0.001) and significantly more oocytes retrieved (17.67 ± 8.86 versus 12.70 ± 7.00, P < 0.001). The number of euploid embryos was significantly higher in the progesterone elevation group (2.32 ± 1.74 versus 1.86 ± 1.42, P = 0.001), whereas the blastocyst formation rate (47.1% [43.7-50.5%] versus 51.0% [49.7-52.4%]), the embryo euploidy rate (48.3% [44.9-51.7%] versus 49.1% [47.7-50.6%], the live birth rate in the first frozen embryo transfer (34.1% versus 31.1%, P = 0.427) and CLBR (38.9% versus 37.0%, P = 0.637) were not significantly different between the two groups. CONCLUSIONS Euploidy rate and CLBR do not significantly differ among PGT-A cycles with and without late-follicular progesterone elevation in a freeze-all approach.
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Mumusoglu S, Polat M, Ozbek IY, Bozdag G, Papanikolaou EG, Esteves SC, Humaidan P, Yarali H. Preparation of the Endometrium for Frozen Embryo Transfer: A Systematic Review. Front Endocrinol (Lausanne) 2021; 12:688237. [PMID: 34305815 PMCID: PMC8299049 DOI: 10.3389/fendo.2021.688237] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 06/23/2021] [Indexed: 11/13/2022] Open
Abstract
Despite the worldwide increase in frozen embryo transfer, the search for the best protocol to prime endometrium continues. Well-designed trials comparing various frozen embryo transfer protocols in terms of live birth rates, maternal, obstetric and neonatal outcome are urgently required. Currently, low-quality evidence indicates that, natural cycle, either true natural cycle or modified natural cycle, is superior to hormone replacement treatment protocol. Regarding warmed blastocyst transfer and frozen embryo transfer timing, the evidence suggests the 6th day of progesterone start, LH surge+6 day and hCG+7 day in hormone replacement treatment, true natural cycle and modified natural cycle protocols, respectively. Time corrections, due to inter-personal differences in the window of implantation or day of vitrification (day 5 or 6), should be explored further. Recently available evidence clearly indicates that, in hormone replacement treatment and natural cycles, there might be marked inter-personal variation in serum progesterone levels with an impact on reproductive outcomes, despite the use of the same dose and route of progesterone administration. The place of progesterone rescue protocols in patients with low serum progesterone levels one day prior to warmed blastocyst transfer in hormone replacement treatment and natural cycles is likely to be intensively explored in near future.
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Affiliation(s)
- Sezcan Mumusoglu
- Department of Obstetrics and Gynecology, Hacettepe University School of Medicine, Ankara, Turkey
| | - Mehtap Polat
- Anatolia IVF and Women Health Centre, Ankara, Turkey
| | | | - Gurkan Bozdag
- Department of Obstetrics and Gynecology, Hacettepe University School of Medicine, Ankara, Turkey
| | | | - Sandro C. Esteves
- Androfert, Andrology and Human Reproduction Clinic, Referral Center for Male Reproduction, Campinas, Brazil
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Peter Humaidan
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
- The Fertility Clinic, Skive Regional Hospital Resenvej 25, Skive, Denmark
| | - Hakan Yarali
- Department of Obstetrics and Gynecology, Hacettepe University School of Medicine, Ankara, Turkey
- Anatolia IVF and Women Health Centre, Ankara, Turkey
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Mizrachi Y, Weissman A. Reply: Should women receive luteal support following natural cycle frozen embryo transfer? A systematic review and meta-analysis. Critical assessment of a review and meta-analysis. Hum Reprod Update 2021; 27:799-800. [PMID: 34086930 DOI: 10.1093/humupd/dmab021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Yossi Mizrachi
- IVF Unit, Department of Obstetrics and Gynecology, Edith Wolfson's Medical Center, Holon, Affiliated with the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel.,Reproductive Services Unit, The Royal Women's Hospital, Melbourne, VIC, Australia
| | - Ariel Weissman
- IVF Unit, Department of Obstetrics and Gynecology, Edith Wolfson's Medical Center, Holon, Affiliated with the Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
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21
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Trautmann C, von Versen-Höynck F. Optimales Protokoll für die Übertragung kryokonservierter Embryonen. GYNAKOLOGISCHE ENDOKRINOLOGIE 2021. [DOI: 10.1007/s10304-020-00373-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Wu H, Zhou P, Lin X, Wang S, Zhang S. Endometrial preparation for frozen-thawed embryo transfer cycles: a systematic review and network meta-analysis. J Assist Reprod Genet 2021; 38:1913-1926. [PMID: 33829375 DOI: 10.1007/s10815-021-02125-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Accepted: 02/21/2021] [Indexed: 01/08/2023] Open
Abstract
PURPOSE To compare the effects of different endometrial preparation protocols for frozen-thawed embryo transfer (FET) cycles and present treatment hierarchy. METHODS Systematic review with meta-analysis was performed by electronic searching of MEDLINE, the Cochrane Library, Embase, ClinicalTrials.gov and Google Scholar up to Dec 26, 2020. Randomised controlled trials (RCTs) or observational studies comparing 7 treatment options (natural cycle with or without human chorionic gonadotrophin trigger (mNC or tNC), artificial cycle with or without gonadotropin-releasing hormone agonist suppression (AC+GnRH or AC), aromatase inhibitor, clomiphene citrate, gonadotropin or follicle stimulating hormone) in FET cycles were included. Meta-analyses were performed within random effects models. Primary outcome was live birth presented as odds ratio (OR) with 95% confidence intervals (CIs). RESULTS Twenty-six RCTs and 113 cohort studies were included in the meta-analyses. In a network meta-analysis, AC ranked last in effectiveness, with lower live birth rates when compared with other endometrial preparation protocols. In pairwise meta-analyses of observational studies, AC was associated with significant lower live birth rates compared with tNC (OR 0.81, 0.70 to 0.93) and mNC (OR 0.85, 0.77 to 0.93). Women who achieved pregnancy after AC were at an increased risk of pregnancy-induced hypertension (OR 1.82, 1.37 to 2.38), postpartum haemorrhage (OR 2.08, 1.61 to 2.78) and very preterm birth (OR 2.08, 1.45 to 2.94) compared with those after tNC. CONCLUSION Natural cycle treatment has a higher chance of live birth and lower risks of PIH, PPH and VPTB than AC for endometrial preparation in women receiving FET cycles.
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Affiliation(s)
- Hanglin Wu
- Department of Obstetrics and Gynaecology, Hangzhou Women's Hospital, No. 369 Kun Peng Road, Zhejiang, 310008, Hangzhou, China
| | - Ping Zhou
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, No. 3 Qingchun East Road, Zhejiang, 310016, Hangzhou, China
| | - Xiaona Lin
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, No. 3 Qingchun East Road, Zhejiang, 310016, Hangzhou, China
| | - Shasha Wang
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, No. 3 Qingchun East Road, Zhejiang, 310016, Hangzhou, China
| | - Songying Zhang
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, No. 3 Qingchun East Road, Zhejiang, 310016, Hangzhou, China.
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23
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Bergenheim SJ, Saupstad M, Pistoljevic N, Andersen AN, Forman JL, Løssl K, Pinborg A. Immediate versus postponed frozen embryo transfer after IVF/ICSI: a systematic review and meta-analysis. Hum Reprod Update 2021; 27:623-642. [PMID: 33594441 DOI: 10.1093/humupd/dmab002] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 12/30/2020] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND In Europe, the number of frozen embryo transfer (FET) cycles is steadily increasing, now accounting for more than 190 000 cycles per year. It is standard clinical practice to postpone FET for at least one menstrual cycle following a failed fresh transfer or after a freeze-all cycle. The purpose of this practice is to minimise the possible residual negative effect of ovarian stimulation on the resumption of a normal ovulatory cycle and receptivity of the endometrium. Although elective deferral of FET may unnecessarily delay time to pregnancy, immediate FET may be inefficient in a clinical setting, following an increased risk of irregular ovulatory cycles and the presence of functional cysts, increasing the risk of cycle cancellation. OBJECTIVE AND RATIONALE This review explores the impact of timing of FET in the first cycle (immediate FET) versus the second or subsequent cycle (postponed FET) following a failed fresh transfer or a freeze-all cycle on live birth rate (LBR). Secondary endpoints were implantation, pregnancy and clinical pregnancy rates (CPR) as well as miscarriage rate (MR). SEARCH METHODS We searched PubMed (MEDLINE) and EMBASE databases for MeSH and Emtree terms, as well as text words related to timing of FET, up to March 2020, in English language. There were no limitations regarding year of publication or duration of follow-up. Inclusion criteria were subfertile women aged 18-46 years with any indication for treatment with IVF/ICSI. Studies on oocyte donation were excluded. All original studies were included, except for case reports, study protocols and abstracts only. Covidence, a Cochrane-tool, was used for sorting and screening of literature. Risk of bias was assessed using the Robins-I tool and the quality of evidence using the Grading of Recommendations, Assessment, Development and Evaluation framework. OUTCOMES Out of 4124 search results, 15 studies were included in the review. Studies reporting adjusted odds ratios (aOR) for LBR, CPR and MR were included in meta-analyses. All studies (n = 15) were retrospective cohort studies involving a total of 6,304 immediate FET cycles and 13,851 postponed FET cycles including 8,019 matched controls. Twelve studies of very low to moderate quality reported no difference in LBR with immediate versus postponed FET. Two studies of moderate quality reported a statistically significant increase in LBR with immediate FET and one small study of very low quality reported better LBR with postponed FET. Trends in rates of secondary outcomes followed trends in LBR regarding timing of FET. The meta-analyses showed a significant advantage of immediate FET (n =2,076) compared to postponed FET (n =3,833), with a pooled aOR of 1.20 (95% CI 1.01-1.44) for LBR and a pooled aOR of 1.22 (95% CI 1.07-1.39) for CPR. WIDER IMPLICATIONS The results of this review indicate a slightly higher LBR and CPR in immediate versus postponed FET. Thus, the standard clinical practice of postponing FET for at least one menstrual cycle following a failed fresh transfer or a freeze-all cycle may not be best clinical practice. However, as only retrospective cohort studies were assessed, the presence of selection bias is apparent, and the quality of evidence thus seems low. Randomised controlled trials including data on cancellation rates and reasons for cancellation are highly needed to provide high-grade evidence regarding clinical practice and patient counselling.
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Affiliation(s)
- Sara J Bergenheim
- Fertility Department 4071, Copenhagen University Hospital, Copenhagen Ø DK-2100, Denmark
| | - Marte Saupstad
- Fertility Department 4071, Copenhagen University Hospital, Copenhagen Ø DK-2100, Denmark
| | - Nina Pistoljevic
- Fertility Department 4071, Copenhagen University Hospital, Copenhagen Ø DK-2100, Denmark
| | - Anders Nyboe Andersen
- Fertility Department 4071, Copenhagen University Hospital, Copenhagen Ø DK-2100, Denmark
| | - Julie Lyng Forman
- Section of Biostatistics, Department of Public Health, University of Copenhagen, Copenhagen K DK-1014, Denmark
| | - Kristine Løssl
- Fertility Department 4071, Copenhagen University Hospital, Copenhagen Ø DK-2100, Denmark
| | - Anja Pinborg
- Fertility Department 4071, Copenhagen University Hospital, Copenhagen Ø DK-2100, Denmark
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24
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Palomba S, Piltonen TT, Giudice LC. Endometrial function in women with polycystic ovary syndrome: a comprehensive review. Hum Reprod Update 2020; 27:584-618. [PMID: 33302299 DOI: 10.1093/humupd/dmaa051] [Citation(s) in RCA: 137] [Impact Index Per Article: 34.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 09/29/2020] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Polycystic ovary syndrome (PCOS) is the most common cause of anovulatory infertility. An endometrial component has been suggested to contribute to subfertility and poor reproductive outcomes in affected women. OBJECTIVE AND RATIONALE The aim of this review was to determine whether there is sufficient evidence to support that endometrial function is altered in women with PCOS, whether clinical features of PCOS affect the endometrium, and whether there are evidence-based interventions to improve endometrial dysfunction in PCOS women. SEARCH METHODS An extensive literature search was performed from 1970 up to July 2020 using PubMed and Web of Science without language restriction. The search included all titles and abstracts assessing a relationship between PCOS and endometrial function, the role played by clinical and biochemical/hormonal factors related to PCOS and endometrial function, and the potential interventions aimed to improve endometrial function in women with PCOS. All published papers were included if considered relevant. Studies having a specific topic/hypothesis regarding endometrial cancer/hyperplasia in women with PCOS were excluded from the analysis. OUTCOMES Experimental and clinical data suggest that the endometrium differs in women with PCOS when compared to healthy controls. Clinical characteristics related to the syndrome, alone and/or in combination, may contribute to dysregulation of endometrial expression of sex hormone receptors and co-receptors, increase endometrial insulin-resistance with impaired glucose transport and utilization, and result in chronic low-grade inflammation, immune dysfunction, altered uterine vascularity, abnormal endometrial gene expression and cellular abnormalities in women with PCOS. Among several interventions to improve endometrial function in women with PCOS, to date, only lifestyle modification, metformin and bariatric surgery have the highest scientific evidence for clinical benefit. WIDER IMPLICATIONS Endometrial dysfunction and abnormal trophoblast invasion and placentation in PCOS women can predispose to miscarriage and pregnancy complications. Thus, patients and their health care providers should advise about these risks. Although currently no intervention can be universally recommended to reverse endometrial dysfunction in PCOS women, lifestyle modifications and metformin may improve underlying endometrial dysfunction and pregnancy outcomes in obese and/or insulin resistant patients. Bariatric surgery has shown its efficacy in severely obese PCOS patients, but a careful evaluation of the benefit/risk ratio is warranted. Large scale randomized controlled clinical trials should address these possibilities.
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Affiliation(s)
- Stefano Palomba
- Unit of Obstetrics and Gynecology, Grande Ospedale Metropolitano of Reggio Calabria, Reggio Calabria, Italy
| | - Terhi T Piltonen
- Department of Obstetrics and Gynecology, PEDEGO Research Unit, Medical Research Center, Oulu University Hospital, University of Oulu, Oulu, Finland
| | - Linda C Giudice
- Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, CA, USA
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25
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Shear MA, Vaughan DA, Modest AM, Seidler EA, Leung AQ, Hacker MR, Sakkas D, Penzias AS. Blasts from the past: is morphology useful in PGT-A tested and untested frozen embryo transfers? Reprod Biomed Online 2020; 41:981-989. [PMID: 33011085 DOI: 10.1016/j.rbmo.2020.07.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 07/07/2020] [Accepted: 07/16/2020] [Indexed: 12/31/2022]
Abstract
RESEARCH QUESTION Day of cryopreservation, inner cell mass (ICM) grade, trophectoderm grade and blastocyst expansion grade have been associated with differences in live birth rate in frozen embryo transfer (FET) cycles. This study sought to examine the likelihood of live birth and whether the morphological grade of the blastocyst is more or equally useful in FET cycles among preimplantation genetic testing for aneuploidies (PGT-A) tested and untested blastocysts. DESIGN This was a retrospective cohort study of 6271 vitrified-warmed, autologous, single-embryo transfer cycles among patients undergoing IVF from July 2013 to December 2017 at a single, university-affiliated infertility practice. The primary outcome was live birth, calculated by generalized estimating equations. RESULTS Among PGT-A tested embryos, inferior ICM grade was associated with a lower chance of live birth (ICM grade B versus A: adjusted risk ratio [aRR] 0.91, 95% confidence interval [CI] 0.84-0.99). Among untested blastocysts there was a lower live birth rate in blastocysts cryopreserved on day 6 versus day 5 (aRR 0.87, 95% CI 0.78-0.96), and those with inferior pre-vitrification trophectoderm grade (trophectoderm grade B versus A: aRR 0.86, 95% CI 0.79-0.94). Blastocysts with a higher pre-vitrification expansion grade (pre-vitrification expansion grade 5 versus 4: aRR 1.1, 95% CI 1.01-1.2) were associated, but ICM grade was not associated (ICM grade B versus A: aRR 0.93, 95% CI 0.86-1.02), with chance of live birth. CONCLUSIONS Among PGT-A untested blastocysts, assessing embryo quality by day of cryopreservation, trophectoderm grade and expansion grade may help to identify embryos with the highest likelihood of live birth. Identifying euploid embryos by PGT-A appears to homogenize the cohort, making blastocyst morphological grade and day of cryopreservation less important.
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Affiliation(s)
- Matthew A Shear
- Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Boston MA, USA; Department of Obstetrics, Gynecology, and Reproductive Biology, Harvard Medical School, Boston MA, USA
| | - Denis A Vaughan
- Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Boston MA, USA; Department of Obstetrics, Gynecology, and Reproductive Biology, Harvard Medical School, Boston MA, USA; Boston IVF, 103 2nd Avenue, Waltham MA, USA
| | - Anna M Modest
- Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Boston MA, USA; Department of Obstetrics, Gynecology, and Reproductive Biology, Harvard Medical School, Boston MA, USA
| | - Emily A Seidler
- Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Boston MA, USA; Department of Obstetrics, Gynecology, and Reproductive Biology, Harvard Medical School, Boston MA, USA; Boston IVF, 103 2nd Avenue, Waltham MA, USA
| | - Angela Q Leung
- Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Boston MA, USA; Department of Obstetrics, Gynecology, and Reproductive Biology, Harvard Medical School, Boston MA, USA; Boston IVF, 103 2nd Avenue, Waltham MA, USA
| | - Michele R Hacker
- Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Boston MA, USA; Department of Obstetrics, Gynecology, and Reproductive Biology, Harvard Medical School, Boston MA, USA
| | | | - Alan S Penzias
- Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Boston MA, USA; Department of Obstetrics, Gynecology, and Reproductive Biology, Harvard Medical School, Boston MA, USA; Boston IVF, 103 2nd Avenue, Waltham MA, USA.
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