Publications by authors named "Ahter Tayyar"

It can be misleading to think that the new severe acute respiratory syndrome coronavirus (SARS-CoV2) which has a very strong mutation and adaptation capabilities, uses only the angiotensin-converting enzyme II (ACE2) pathway to reach target cells. Despite all the precautions taken, the pandemic attack continues and the rapid increase in the number of deaths suggest that this virus has entered the cell through different pathways and caused damage through different mechanisms. The main reason why the ACE2 pathway comes to the fore in all scientific studies is that this receptor is located at the entry point of basic mechanisms that provide alveolo-capillary homeostasis.

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Although many pregnant women have been infected by coronavirus, the presence of intrauterine vertical transmission has not been conclusively reported yet. What prevents this highly contagious virus from reaching the fetus? Is it only the presence of a strong placental barrier, or is it the natural absence of the some receptor that the viruses use for transmission? We, therefore, need to comprehensively understand the mechanism of action of the mammalian epithelial barriers located in two different organs with functional similarity. The barriers selected as potential targets by SARS-CoV-2 are the alveolo-capillary barrier (ACB), and the syncytio-capillary barrier (SCB).

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The aim of this study is to evaluate the effect of GnRH agonist or GnRH antagonist therapy on bleomycin-administered rats by examining ovarian follicle counts and AMH levels. A total of 30 female Wistar albino rats aged 4-6 months were randomly divided into 4 groups. First, an intramuscular injection of bleomycin (30 mg/m) was administered to all except the control group on the 1st, 8th and 15th days.

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Aim: This study aimed to compare the frequency and risk factors of de novo urinary incontinence (UI) following abdominal and vaginal hysterectomies for benign disease.

Methods: The study included patients without incontinence history who underwent abdominal or vaginal hysterectomy for benign indications. Incontinence statuses were assessed at least one year after hysterectomies.

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Introduction: Recombinant follicle stimulating hormone (rFSH), recombinant luteinizing hormone (rLH), and urinary human menopausal gonadotropin (uHMG) are widely used for controlled ovarian stimulation (COS). This study compares the effects of rFSH only, rLH + rFSH, and HMG + rFSH administration on fertilization (IVF) outcomes for patients in three different yearly follow-up cycles.

Material And Methods: This retrospective, single-center cohort study was conducted from January 2001 to June 2016 at Istanbul Memorial Hospital, Artificial Reproductive Technology Center.

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Article Synopsis
  • The study investigates the involvement of the Wnt signaling pathway in early- and late-onset preeclampsia (PE) by measuring serum levels of Dickkopf-1 and R-Spondin-3 in 80 pregnant women.
  • Results indicated that Dickkopf-1 levels were significantly higher in the early-onset PE group compared to controls, but no significant differences were found between the two PE groups or in R-Spondin-3 levels.
  • The study concludes that elevated Dickkopf-1 may play a role in early-onset PE, prompting the need for further research to clarify its exact implications in PE pathology.
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Introduction: Fibroblast growth factor-19 (FGF-19) and its co-receptor, beta-klotho, regulate bile acid synthesis in the liver as an enterohepatic feedback mechanism. In this study, our aim was to investigate the circulating FGF-19 and β-klotho levels in intrahepatic cholestasis of pregnancy (ICP) cases.

Material And Methods: A cross-sectional study including 40 women whose pregnancies were complicated with ICP were recruited for the study group.

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  • The study measured levels of the mitochondrial fusion protein mitofusin-2 (Mfn2) in 82 pregnant women, comparing those with preeclampsia to a control group with normal pregnancies.
  • Findings showed that women with preeclampsia had significantly higher levels of Mfn2, especially in the early-onset preeclampsia group, suggesting Mfn2's role as a stress response to hypoxia and endothelial dysfunction.
  • The research highlights a correlation between Mfn2 levels and maternal blood pressure, seeding potential for further investigation into mitochondrial markers in pregnancy-related complications.
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  • The study aimed to evaluate the effectiveness of using both an intravaginal PGE2 insert and an intracervical Foley balloon catheter for inducing labor in women with unfavorable cervices.
  • Patients were randomly divided into a control group receiving only the PGE2 insert and a study group receiving both treatments, resulting in 294 women being analyzed.
  • Results showed that for first-time mothers, the combination of treatments significantly reduced the time from induction to both active labor and delivery compared to the control group, without increasing the cesarean section rate.
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Objective: To investigate sestrin 2 (SESN2) levels in preeclampsia (PE) cases and uncomplicated pregnancies.

Methods: Cross-sectional study including 26 pregnant women with PE, 24 with severe-PE, and 30 randomly selected healthy pregnant women.

Results: The mean arterial pressure, severe proteinuria, number of HELLP syndrome cases, and serum SESN2 levels in the severe PE group were significantly higher than those in the other groups (p < 0.

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Background: Primary dysmenorrhea, defined as painful menstrual cramps originating in the uterus without underlying pathology, is a gynecological disease that affects quality of life and school success. Our goal was to determine the effect of anterior uterocervical angle on primary dysmenorrhea and disease severity.

Methods: A total of 200 virgin adolescents, 16 to 20 years of age, were included in the study.

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Objective: The aim of the present study was to determine which of the umbilical entry routes for intraperitoneal access has a better cosmetic result.

Material And Methods: This was a prospective study (Canadian Task Force classification II-1). In total, 105 patients who underwent laparoscopic surgery were included.

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Introduction: The aim of this study is to compare first- and second-trimester Down syndrome biochemical screening markers in intrahepatic cholestasis of pregnancy (ICP) and normal pregnancies.

Material And Methods: This observational case-control study was conducted at Health Sciences University Zeynep Kamil Maternity and Children's Health Training and Research Hospital and the Department of Obstetrics and Gynecology at Erciyes University Medical Faculty during 2016-2017. The study included 165 patients, and consisted of 62 women who had been diagnosed with ICP (the ICP-diagnosed group) and 103 healthy pregnant women (the control group).

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The objective of this study is to investigate the ischemia-modified albumin (IMA) level, and the IMA/albumin ratio (IMAR) in healthy pregnant women, and pregnant women with intrahepatic cholestasis of pregnancy (ICP). This cross-sectional study included 53 women with ICP and 52 healthy pregnant women. Their serum IMA and albumin levels were analyzed, and the women were followed up to delivery.

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Pain relief of two different oral contraceptive pills (OCPs) in severe primary dysmenorrhoea (PD) was compared. Sixty-six nulliparous patients with severe PD requiring contraception were evaluated. Group 1 comprised 33 healthy controls.

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Introduction And Hypothesis: This study examined the early outcomes of laparoscopic (LS) pectopexy and evaluated its effects on female sexual function and quality of life (QoL).

Methods: Twenty-two patients with apical prolapse who underwent LS pectopexy were included. Outcomes of the procedure were noted; the Female Sexual Function (FSFI) and Prolapse Quality of Life (P-QOL) questionnaires were completed preoperatively and 6 months postoperatively.

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Objective: To evaluate the effect of embryo flash position and movement of the air bubbles at 1 and 60 minutes after ET on clinical pregnancy rates (PRs).

Design: Prospective clinical trial.

Setting: University fertility clinic.

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Article Synopsis
  • The study aimed to compare cytoglobin (CYGB) levels in women with early-onset and late-onset preeclampsia to those with uncomplicated pregnancies.
  • A total of 52 women with preeclampsia (26 with early-onset and 26 with late-onset) and 27 healthy pregnant women participated, and serum CYGB levels were measured.
  • Results indicated that women with preeclampsia had significantly higher CYGB levels compared to the control group, but there was no significant difference in CYGB levels between early-onset and late-onset preeclampsia groups.
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Objective: Myomectomy performed during cesarean section is still controversial because of the potential for associated complications, especially with large myomas. Many obstetricians avoid performing cesarean myomectomy procedures because of the risk of uncontrollable hemorrhage. However, the prevalence of pregnant women with myomas is increasing, leading to an increase in the likelihood that physicians will encounter this issue.

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BACKGROUND The aim of this study was to evaluate the effect of oral contraceptive pills (OCP) on the macula, the retinal nerve fiber layer (RNFL), and choroidal thickness (CT). MATERIAL AND METHODS A total of 24 healthy women taking monophasic OCP (3 mg drospirenone and 0.03 mg ethinylestradiol) for contraception only for at least one year were compared with a control group of 24 healthy women who were not taking an OCP.

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Article Synopsis
  • Turner’s syndrome (TS) is a condition caused by the complete or partial absence of an X chromosome, affecting about 1 in 2200 live-born females, often diagnosed through karyotype analysis due to issues like pregnancy loss or IVF failures.
  • In a case involving a 32-year-old patient who underwent IVF after ICSI-PGD and was diagnosed with a 45X/46XX karyotype, a fetal anomaly (upper limb hemimelia) was detected at the 12-week scan, leading to the termination of that fetus.
  • The case highlights the increased risk of fetal anomalies in mosaic TS pregnancies, emphasizing the need for careful prenatal monitoring even with selected normal karyotype embryos.
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Objective: Insulin resistance (IR) seems to be the main pathogenic factor in polycystic ovary syndrome (PCOS). Adiponectin and tumor necrosis factor-alpha (TNF-α) are important in IR. The aim of this study was to evaluate the correlations of osteocalcin, adiponectin, and TNF-α with IR in PCOS.

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  • The study aimed to investigate the effects of borderline oligohydramnios in late preterm pregnancies on perinatal outcomes.
  • A total of 430 women with uncomplicated singleton pregnancies were compared, with 107 having borderline oligohydramnios and 323 having normal amniotic fluid levels.
  • Results showed no significant differences in most adverse perinatal outcomes between the two groups, although there was a higher rate of labor induction and lower renal artery pulsatility index in the borderline oligohydramnios group.
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  • The study aimed to compare the prevalence of gestational diabetes mellitus (GDM) using two different criteria: the American Diabetes Association (ADA) and the International Association of Diabetes and Pregnancy Study Group (IADPSG).
  • A total of 320 pregnant women underwent a 75g oral glucose tolerance test (OGTT), with results showing a GDM prevalence of 9.1% under ADA criteria and 19.4% under IADPSG criteria.
  • The findings suggest that the IADPSG criteria significantly increase the prevalence of GDM, potentially leading to higher healthcare costs, and highlight that HbA1c levels do not contribute to GDM diagnosis.
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