Publications by authors named "Nikolaos F Vlahos"

Aim: The purpose of this study is to investigate the knowledge level and beliefs of healthcare professionals working in Assisted Reproductive Technology (ART) units in Athens, regarding Planned Oocyte Cryopreservation (POC).

Methods: A cross-sectional survey was conducted in May 2024 among 105 female staff at two major ART units in Athens: Institute of Life IASO, IASO Maternity Hospital and the HYGEIA IVF Embryogenesis unit, Mitera Maternity Hospital. Participants completed anonymized questionnaires, adapted from Kim's et al.

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Obesity is a multifactorial condition linked to severe health complications, including cardiovascular diseases and endothelial dysfunction. Both obesity and high-fat diets (HFDs) are strongly associated with neuroinflammation, particularly in the hypothalamus. The autonomic nervous system (ANS), which controls involuntary physiological processes, is critical for maintaining cardiovascular health, and its dysfunction is implicated in endothelial disorders.

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The objective of the study was to explore the combined effect of polymorphisms in the platelet glycoproteins Ia (GpIa) and IIIa (GpIIIa), along with the platelet-endothelial cell adhesion molecule-1 (PECAM-1) and P-Selectin genes, on the risk of recurrent pregnancy loss. This study involved 162 women with primary unexplained recurrent miscarriages and 60 fertile controls who had at least one uncomplicated full-term pregnancy without experiencing fetal loss. All participants were of Greek origin and were genotyped for four single nucleotide polymorphisms (SNPs), GpIa-C807T, GpIIIa-PlA1/PlA2, PECAM-1-C373G, and P-Selectin-A37674C, using pyrosequencing.

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Background: Childhood obesity is on the rise globally, raising concerns among the medical community. The phenomenon is closely linked to high-fat diets. Concurrently, the prevalence of central precocious puberty (CPP) is increasing.

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Purpose: to compare the Anti-Müllerian hormone (AMH) plasma concentrations of pre-pubertal and pubertal daughters born to polycystic ovary syndrome (PCOS) mothers to daughters born to control mothers and to investigate their alterations during pre-puberty and all stages of puberty.

Methods: We critically investigated and meta-analyzed observational studies, which compared the plasma concentrations of AMH in pre-pubertal and pubertal daughters of PCOS pregnancies. A search of the literature was completed till the end of June of 2024 in the PubMed, Scopus, and Medline for the eligible studies.

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Endocrine-disrupting chemicals (EDCs) are environmental and industrial agents that interfere with hormonal functions. EDC exposure is linked to various endocrine diseases, especially in reproduction, although the mechanisms remain unclear and effects vary among individuals. Neuroinflammation, particularly hypothalamic inflammation, is an emerging research area with implications for endocrine-related diseases like obesity.

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To assess the effect of hysteroscopic polypectomy on the in vitro fertilization (IVF) results in infertile women with at least one prior negative IVF outcome. This retrospective cohort study included women who had attended the "2nd Department of Obstetrics and Gynecology of the National and Kapodistrian University of Athens" and "Iaso" Maternity Hospital from October 2019 to January 2023 for infertility treatment. The medical records of 345 women aged 18-45 years old without abnormal findings in hysterosalpingography (HSG) and with at least one previous failed IVF procedure were analyzed.

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The onset of puberty, which is under the control of the hypothalamic-pituitary-gonadal (HPG) axis, is influenced by various factors, including obesity, which has been associated with the earlier onset of puberty. Obesity-induced hypothalamic inflammation may cause premature activation of gonadotropin-releasing hormone (GnRH) neurons, resulting in the development of precocious or early puberty. Mechanisms involving phoenixin action and hypothalamic microglial cells are implicated.

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Infertility is a modern health problem. Obesity is another expanding health issue associated with chronic diseases among which infertility is also included. This review will focus on the effects of weight loss by medical therapy on fertility regarding reproductive hormonal profile, ovulation rates, time to pregnancy, implantation rates, pregnancy rates, normal embryo development, and live birth rates.

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Introduction: Thrombophilic genetic polymorphisms of the platelet glycoproteins Ia (GpIa) and IIIa (GpIIIa) have been associated with an increased risk of recurrent miscarriages. The aim of this study was to investigate the association of genetic polymorphisms GpIa-C807T and GpIIIa-T1565C-PlA1/PlA2 with platelet function in women with unexplained spontaneous recurrent miscarriages.

Methods: This cross-sectional study comprised 196 unrelated nulliparous Greek women with a history of unexplained recurrent miscarriages.

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The prevalence of central precocious puberty (CPP) in girls has increased worldwide and is often associated with obesity in childhood as well as high fat/high glycemic index diets. Evidence suggests that subjects with obesity present with alterations in appetite-regulating hormones. The arcuate and paraventricular nuclei of the hypothalamus are the centers of action of appetite hormones, as well as the location of gonadotropin-releasing hormone (GnRH) neurons, the activation of which results in the onset of puberty.

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Li-Fraumeni syndrome (LFS) is an autosomal dominant hereditary cancer syndrome associated with germline pathogenic variants in the tumor protein p53 () gene and elevated risk of a broad range of early-onset malignancies. Patients with LFS are at risk of a second and third primary tumor. A 15-month-old girl consulted for clitoromegaly and pubic hair.

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Female infertility and reproduction is an ongoing and rising healthcare issue, resulting in delaying the decision to start a family. Therefore, in this review, we examine potential novel metabolic mechanisms involved in ovarian aging according to recent data and how these mechanisms may be addressed through new potential medical treatments. We examine novel medical treatments currently available based mostly on experimental stem cell procedures as well as caloric restriction (CR), hyperbaric oxygen treatment and mitochondrial transfer.

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Several factors during childhood and adolescence are thought to be associated with the development of proliferative benign breast diseases and breast cancer in adulthood. In order to identify them, the authors conducted an extensive review of the literature up to October 2022, searching for clinical studies, reports, and guidelines in English. A thorough Medline/Pubmed and Google scholar database research was performed, investigating the link between diet, exercise, age of menarche, body mass index, ionizing radiation exposure during childhood and adolescence, and proliferative breast diseases and breast cancer in adulthood.

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Article Synopsis
  • The study explores the role of the maternal immune system in embryo implantation and pregnancy maintenance, focusing on factors like Natural Killer (NK) cells and HLA-DQA1 alleles in women facing infertility challenges.
  • It involved 188 women, including those with recurrent miscarriages and failed IVF attempts, measuring NK cell percentages and CD4/CD8 ratios through blood tests.
  • Results showed increased NK cell levels and similar CD4/CD8 ratios in both groups, with a notable prevalence of certain HLA-DQA1 alleles but no significant differences between the two infertility issues examined.
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  • Complete Androgen Insensitivity Syndrome (CAIS) is a genetic condition caused by mutations in the androgen receptor gene, leading to resistance to male hormones and resulting in a female appearance in genetically male individuals.
  • A 16-year-old patient with CAIS presented with primary amenorrhea, normal female genitalia, and a karyotype of 46, XY, alongside hormonal imbalances indicative of the syndrome, including increased LH and testosterone levels.
  • Genetic testing identified a rare mutation in the androgen receptor gene, leading to the patient's treatment through gonadectomy and hormone replacement therapy, highlighting the need for better diagnosis and management protocols for CAIS.
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Conjoined twins represent a rare type of monoamniotic twins. Ultrasound assessment during the first trimester can facilitate the diagnosis, however further assessment by colour Doppler studies, 3D imaging, fetal echocardiography and fetal magnetic resonance imaging (MRI) is usually required in order to determine the specific fetal abnormalities and to guide appropriate pregnancy management. This case report presents a rare case of conjoined twins complicating a dichorionic-diamniotic triplet pregnancy, achieved after intracytoplasmic sperm injection (ICSI) and blastocyst transfer.

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  • The incidence of endometrial cancer is increasing, necessitating updated knowledge among healthcare professionals regarding its management and classification.
  • The review highlights ongoing debates about how to manage high-risk cases, particularly the use of sentinel lymph node biopsy (SLNB), while also addressing fertility preservation and adjuvant therapies.
  • Findings indicate that minimally invasive surgery (MIS) is becoming the preferred surgical approach due to its favorable outcomes, and SLNB could be crucial for guiding treatment in both low-risk and high-risk endometrial cancer cases.
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Cancer during childhood and adolescence remains a major public health issue, affecting a significant portion of this age group. Although newer anti-cancer treatments have improved survival rates, this comes at a cost in terms of gonadotoxic effects. As a result, the preservation of fertility is important.

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Fetal exposure in adverse environmental factors during intrauterine life can lead to various biological adjustments, affecting not only in utero development of the conceptus, but also its later metabolic and endocrine wellbeing. During human gestation, maternal bone turnover increases, as reflected by molecules involved in bone metabolism, such as vitamin D, osteocalcin, sclerostin, sRANKL, and osteoprotegerin; however, recent studies support their emerging role in endocrine functions and glucose homeostasis regulation. Herein, we sought to systematically review current knowledge on the effects of aforementioned maternal bone biomarkers during pregnancy on fetal intrauterine growth and metabolism, neonatal anthropometric measures at birth, as well as on future endocrine and metabolic wellbeing of the offspring.

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Background: The COVID-19 pandemic has led to significant changes in the care of pregnant women and their fetuses. Emerging data show elevated depression and anxiety symptoms among pregnant women. Aims: The purpose of this article is to investigate the psychological and behavioral impact of the COVID-19 pandemic on pregnant women in Greece during the first national lockdown.

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In this review, we analyzed existing literature regarding the use of Gonadotropin-releasing Hormone (GnRH) analogues (agonists, antagonists) as a co-treatment to chemotherapy and radiotherapy. There is a growing interest in their application as a prophylaxis to gonadotoxicity caused by chemotherapy and/or radiotherapy due to their ovarian suppressive effects, making them a potential option to treat infertility caused by such chemotherapy and/or radiotherapy. They could be used in conjunction with other fertility preservation options to synergistically maximize their effects.

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Article Synopsis
  • Recent studies indicate a rise in precocious puberty, particularly in girls, which is linked to increasing childhood obesity due to poor nutrition and energy imbalance.
  • High-fat and high-glycaemic-index diets may trigger hypothalamic inflammation, leading to the activation of microglial cells that can stimulate gonadotropin-releasing hormone (GnRH) neurons, potentially causing early onset of puberty.
  • The review explores the relationship between diet-induced inflammation and precocious puberty, focusing on the physiology of GnRH neurons and the underlying mechanisms detailed in recent research.
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Baraitser - Winter Cerebrofrontofacial Syndrome (BWCFF) is a rare disorder characterized by facial dysmorphism and mental retardation of varying grades. The clinical phenotype of BWCFF indicates variable phenotypic expression involving various congenital malformations such as cardiac, renal and musculoskeletal abnormalities. Nevertheless, the prenatal presentation of BWCFF is rarely described, making prenatal diagnosis challenging.

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miRNAs are small noncoding RNAs that regulate gene expression at the post-transcriptional level. Since their discovery, miRNAs have been associated with every cell function including malignant transformation and metastasis. Endometrial cancer is the most common gynecologic malignancy.

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