Publications by authors named "Nikolaos Polyzos"

Aim: Electronic prescribing has allowed for the collection of prescription data in real time in Greece for the first time. Hence, the aim of the current study was to present the characteristics of prescriptions for the Greek population during the period from 2015 to 2021.

Methods: This retrospective study was based on data extracted from the nationwide Greek electronic prescription database between January 2015 and December 2021.

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Background: Accumulating evidence indicates that pregnancies after artificial cycle frozen embryo transfer are associated with an increased risk of preeclampsia. Uterine artery Doppler, along with maternal factors and serum biomarkers, is a crucial biomarker for first-trimester preeclampsia screening, aiding in identifying "high-risk" patients. Guidelines strongly recommend administering aspirin (150 mg/d) in these women, owing to robust evidence demonstrating a 62% reduction in the incidence of preeclampsia.

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Article Synopsis
  • A panel of international experts evaluated and discussed the POSEIDON criteria, aiming to improve management strategies for women with low prognosis in assisted reproductive technology (ART).
  • Through a Delphi consensus process involving multiple rounds of voting, 53 experts reviewed 17 statements and reached consensus on their relevance for patient care and outcomes in ART.
  • Key recommendations include using specific treatments and tools to enhance success rates, while emphasizing the need for more large-scale studies to validate existing findings.
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To analyze whether combinations of polymorphisms within FSHR gene influence ovarian response (OR) to stimulation. A multicenter prospective cohort study was conducted from 11/2016-06/2019 in Europe and Asia including predicted normo-responders under 38y. Patients underwent ovarian stimulation using fixed-dose 150 IU rFSH in a GnRH antagonist protocol.

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Women diagnosed with gynecological cancer are likely to face additional consequences beyond those common to all cancer patients leading to significant physical and psychological morbidity. Longitudinal studies addressing the prevalence of psychological distress, anxiety, or psychosexual health during follow-up in patients diagnosed with borderline ovarian tumors are lacking. This study explores this prevalence compared with controls who underwent comparable surgical treatment for benign ovarian tumors.

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Article Synopsis
  • The study investigated the current medically assisted reproduction (MAR) data collection systems across EU Member States and explored how they could contribute to a unified registry for the EuMAR project.
  • Significant variations were found in data types, collection methods, and reporting requirements, indicating a need for standardized practices to improve MAR data collection across the EU.
  • The cross-sectional study surveyed and interviewed participants from 26 EU countries, revealing that half have national MAR registries with cycle-by-cycle data, while others rely on aggregated data or have no registry at all.
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The goal of the current work was to assess the nutritional profile and phytochemical properties of cucurbit ( L.) seeds, seed oils and oil extraction by-products (e.g.

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Research Question: Can the developed clinical prediction model offer an accurate estimate of the likelihood of live birth, involving blastocyst morphology and vitrification day after single vitrified-warmed blastocyst transfer (SVBT), and therefore assist clinicians and patients?

Study Design: Retrospective cohort study conducted at a Spanish university-based reproductive medicine unit (2017-2021) including consecutive vitrified-warmed blastocysts from IVF cycles. A multivariable logistic regression incorporated key live birth predictors: vitrification day, embryo score, embryo ploidy status and clinically relevant variables, i.e.

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Study Question: Is there any difference in ovarian response and embryo ploidy following progesterone-primed ovarian stimulation (PPOS) using micronized progesterone or GnRH antagonist protocol?

Summary Answer: Pituitary downregulation with micronized progesterone as PPOS results in higher number of oocytes retrieved and a comparable number of euploid blastocysts to a GnRH antagonist protocol.

What Is Known Already: Although the GnRH antagonist is considered by most the gold standard protocol for controlling the LH surge during ovarian stimulation (OS) for IVF/ICSI, PPOS protocols are being increasingly used in freeze-all protocols. Still, despite the promising results of PPOS protocols, an early randomized trial reported potentially lower live births in recipients of oocytes resulting following downregulation with medroxyprogesterone acetate as compared with a GnRH antagonist protocol.

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Research Question: Is partial compaction during morula formation associated with an embryo's developmental ability and implantation potential?

Design: Retrospective analysis of data from 196 preimplantation genetic testing for aneuploidy (PGT-A) cycles. Embryos starting compaction were grouped according to the inclusion or not of all the blastomeres in the forming morula (full compaction or partial compaction). The possible effect of maternal age and ovarian response on compaction was analysed.

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Objective: The aim of this study is to understand the global practice of routine hormonal monitoring (HM) during ovarian stimulation (OS) in the context of assisted reproductive technique (ART) treatment.

Methods: An open-access questionnaire was available to 3,845 members of IVF-Worldwide.com from September 8 to October 13, 2021.

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Article Synopsis
  • The study looked at 36,395 embryo tests from different labs to see how the diagnosis of mosaicism (mixed chromosome numbers) affects the chances of having healthy embryos (euploid).
  • The results showed that labs with fewer mosaicism reports had higher rates of healthy embryos available for transfer, which is important for patients wanting successful pregnancies.
  • The study included data from patients in multiple countries and used advanced testing methods, highlighting the complexity and variation in embryo testing results.
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(1) Background: The presence of adenomyosis among pregnant patients has been associated with a higher incidence of miscarriage and pregnancy complications. Although the role of adenomyosis in women undergoing in vitro fertilization (IVF) was investigated in several studies and demonstrated a potentially detrimental effect on live birth rates following IVF, most of them were small studies in which the adenomyosis diagnosis was not confirmed based on solid ultrasonographic criteria. (2) Methods: 3503 patients undergoing their first blastocyst frozen transfer through a hormonal replacement (HRT) FET cycle.

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Ovarian stimulation for assisted reproductive technology is traditionally started in the early follicular phase. The essential rationale is to allow timely follicle growth and oocyte retrieval to ensure synchronization of the in-vitro cultured embryos with the receptive period of the endometrium in a fresh transfer cycle. In addition, conventional thought suggested that follicle recruitment happened only once, around menstruation.

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Several European administrations have applied various mechanisms promoting cost containment to stabilise their budgets for pharmaceutical expenditure. Since 2016, Greece has adopted the clawback as a policy to contain the NHS hospitals' pharmaceutical expenditure, which increased significantly in the 2016-2020 period. The present study reviews the impact of this policy on the operation of NHS hospitals, the uninterrupted supply and rational use of their medicines, along with the sustainability of their finances.

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Background: Triggering final oocyte maturation is a key step of ovarian stimulation. Although previous studies demonstrated a negative association between female BMI and serum hCG levels, little evidence is available regarding the association between oocyte yield and patients' BMI. The scope of the current study was to examine whether the efficiency of the r-hCG and triptorelin to trigger final oocyte maturation may be associated with patients' BMI or weight.

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Objective: To evaluate whether patients with high-serum progesterone levels before frozen embryo transfer (FET) under hormonal replacement therapy present with worse reproductive outcomes.

Design: A cohort retrospective study.

Setting: A university-affiliated fertility center.

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Article Synopsis
  • The study investigates the link between specific genetic variants in the FSHR gene and reproductive outcomes in patients undergoing IVF, focusing on those predicted to have a normal response.
  • Conducted across multiple countries from 2016 to 2019, the research involved 351 patients under 38 years old, tracking clinical pregnancy rates (CPR), live birth rates (LBR), and miscarriage rates in relation to various FSHR genotypes.
  • Results indicate that patients with the homozygous variant allele G of c.919A>G had significantly higher CPR and LBR compared to the genotype AA, suggesting that genetic factors may influence reproductive success in IVF treatments.
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Article Synopsis
  • * A systematic review of studies up to June 2022 revealed a generally positive relationship between the number of oocytes retrieved and CLBR, but this relationship differs based on the age of the patients.
  • * For women under 35, retrieving more than 25-30 oocytes offers limited benefit, whereas for those over 35, more oocytes can enhance CLBR until they reach advanced reproductive age (44+), where CLBR remains low regardless of oocyte count.
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Article Synopsis
  • - High ovarian response to stimulation is identified by having more than 18-20 follicles or oocytes, indicating a risk for complications like ovarian hyper-stimulation syndrome (OHSS).
  • - Diagnosis of high response can occur before or after oocyte retrieval, and is influenced by ovarian reserve markers like AMH and AFC, especially in women with PCOS.
  • - Effective management strategies involve personalized treatment plans based on monitoring, which can help reduce the risk of OHSS for those identified as high responders.
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Objective: To assess patients' and embryonic characteristics that may have an influence on the decision to transfer a mosaic embryo.

Method: Single centre retrospective cohort study including 1247 PGT-A cycles. Demographic and clinical factors associated with a decision to transfer a mosaic embryo were studied.

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Study Question: Is there any difference in the mean number of euploid embryos following luteal phase start (LS) and follicular phase start (FS) of ovarian stimulation?

Summary Answer: The mean number of euploid blastocysts is equivalent independent of whether the inseminated oocytes are derived from FS or LS.

What Is Known Already: Starting ovarian stimulation at any time of the cycle ('random-start') is commonly used for emergency fertility preservation in cancer patients. A few retrospective studies have been published evaluating LS in women undergoing ovarian stimulation in the context of IVF, but there is a lack of robust data on the comparative efficacy of LS versus FS.

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Ulipristal acetate (UPA), used for the treatment in women with symptomatic fibroids, is associated with endometrial changes visualised on ultrasound as thickening up to more than 16 mm in approximately 10% of the patients. Is saline infusion sonography (SIS) a good alternative for more invasive techniques, to evaluate the presence of intrauterine pathology? Ten patients, presenting with UPA associated endometrial changes at their follow up ultra-sonographic evaluation, were included. Our study demonstrated that SIS is feasible and painless in patients presenting with UPA associated endometrial changes.

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Research Question: Is there any imbalance in the sex ratio at the blastocyst stage of human embryos? And what is the sex ratio in euploid, transferred, implanted blastocysts and at birth?

Design: Embryos from 646 women undergoing 921 preimplantation genetic testing for aneuploidy (PGT-A) cycles from September 2017 to February 2020 were included. Data from the chromosomal constitution of 2637 biopsied blastocysts were retrospectively analysed. Trophectoderm samples were analysed by next-generation sequencing.

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The assessments of oocyte quality and quantity and endocrine profile have traditionally been the cornerstone of the general workup of couples with infertility. Over the years, several clinical, hormonal, and functional biomarkers have been adopted to assess ovarian function and identify endocrine disorders before assisted reproductive technology. Furthermore, the genetic workup of patients has drastically changed, introducing novel markers.

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