Publications by authors named "Cem Demirel"

Article Synopsis
  • The study aimed to assess how adjuvant letrozole affects the rate of euploid embryos in patients undergoing GnRH antagonist cycles for fertility treatments.
  • It analyzed data from 713 patients, comparing 84 who received letrozole with 629 who did not, noting that those on letrozole used fewer gonadotropins but had a slightly longer stimulation time.
  • The results showed no significant difference in euploidy rates or live birth rates between the letrozole and control groups, concluding that letrozole does not impact embryo quality in this context.
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Introduction: Concerning contemporary fertilisation (IVF) practice, the use of frozen embryo transfer (FET) cycles has become more common than fresh transfers. Natural cycle (NC), programmed artificial cycle and mild stimulation cycle are primary endometrium preparation cycles. Monitoring serum progesterone levels in FET cycles are in the scope of current research focus.

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Research Question: What should be the optimal route of luteal support in programmed frozen embryo transfer (FET) cycles?

Design: This was a randomized, parallel, phase IV pilot trial with three groups of women undergoing FET along with hormone replacement therapy for endometrial preparation at a tertiary private IVF centre (NCT03948022). Women with at least one autologous cryopreserved blastocyst were included. After preparing the endometrium with oestradiol, 151 women were randomly assigned to one of the following three progesterone arms before embryo transfer: oral (10 mg) dydrogesterone (DYD), total daily dose 40 mg (n = 52); 8% (90 mg) progesterone vaginal gel (VAG), total daily dose 180 mg (n = 55); or intramuscular progesterone (IMP) 50 mg/ml in oil, total daily dose 100 mg (n = 44).

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Article Synopsis
  • The study investigates the impact of dual trigger versus hCG trigger on the ploidy rate of blastocysts in preimplantation genetic screening (PGT-A) cycles with 385 cases analyzed.
  • The results showed no significant difference in euploidy rates between the dual trigger group (26.1%) and the hCG group (23.4%), even after analyzing different age groups.
  • Although dual triggering reduced the stimulation duration, it did not improve pregnancy outcomes, indicating the need for further research on different infertility causes.
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A small proportion of infertile women experience repeated oocyte maturation abnormalities (OMAS). OMAS include degenerated and dysmorphic oocytes, empty follicle syndrome, oocyte maturation arrest (OMA), resistant ovary syndrome and maturation defects due to primary ovarian insufficiency. Genetic factors play an important role in OMAS but still need specifications.

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Although there is no known difference between the clinical manifestations of SARS-CoV-2 in pregnant and non-pregnant women based on the studies published until now, in vitro fertilization (IVF) treatments were suspended during the pandemic due to uncertainties with the suggestions of associated societies. However, we do not have enough data on the exact effects of SARS-CoV-2 on fertility and pregnancy and whether there are damaging effects on IVF outcome. There is no available evidence about the transmission of SARS-CoV-2 by either sexual way or through intrauterine insemination (IUI) or IVF.

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Objective(s): Cervical incompetence is an important cause of recurrent pregnancy loss, typically presenting in the second trimester with silent cervical dilation and premature delivery of the fetus. We aimed to evaluate the conception rate and time to conception or failure to conceive after preconceptional laparoscopic abdominal cerclage (LAC).

Study Design: We conducted this retrospective observational cohort study at a tertiary referral center.

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Objective: Embryo quality assessment with morphological evaluation remains the first-line method of assessment to select the best embryo for transfer. We aimed to determine if an effect of poor quality embryos on good quality ones exists, whether by a paracrine effect or an adverse endometrial influence, when they are transferred together.

Materials And Methods: We included 412 couples, who underwent intracytoplasmic sperm injection (ICSI) cycles in a tertiary IVF center.

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Objective: The aim of the study was to evaluate the effect of systemically administrated curcumin on the prevention of peridural fibrotic tissue and adhesion formation in a rat laminectomy model.

Methods: Thirty-two Wistar albino rats were randomly selected and equally divided into 4 groups as follows: negative control group (group I) did not undergo operation; positive control group (group II) underwent laminectomy without treatment; group III (low-dose curcumin; 100 mg/kg); and group IV (high-dose curcumin; 200 mg/kg). Curcumin was administered intraperitoneally per day for 7 days after surgery starting from day 0.

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Background/aim: The aim of this study was to investigate the possible toxicity of the Ankaferd Blood Stopper (ABS) on the neural system.

Materials And Methods: Thirty Sprague Dawley rats were randomized into ABS (n: 15) and control (n: 15) groups. Following the anaesthetic induction, total laminectomy was performed to the lower thoracic, and upper lumbar areas in both groups and medulla spinalis was exposed.

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In vitro fertilization (IVF) involves controlled ovarian hyperstimulation using hormones to produce large numbers of oocytes. The success of IVF is tightly linked to the availability of mature oocytes. In most cases, about 70% to 80% of the oocytes are mature at the time of retrieval, however, in rare instances, all of them may be immature, implying that they were not able to reach the metaphase II (MII) stage.

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Background/aim: Cerebral vasospasm is a term that refers to prolonged, slowly progressing but reversible pathological narrowing of cerebral arteries occurring several days after subarachnoid hemorrhage (SAH), usually accompanied by a decrease in perfusion distal to the affected artery. Leptin is an endogenous polypeptide hormone that can be carried freely and bound to protein in the blood. Materials and methods: We investigated the superiority of topical application of leptin that may make a contribution to the development of new treatment modalities for unconscious patients in brain injury intensive care units and its preventive effect, which is considered to have multifactorial pathogenesis on cerebral vasospasm occurring after SAH via stereological studies of the basilar artery.

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Objective: To evaluate the association between progesterone elevation on the day of human chorionic gonadotropin (hCG) administration and clinical pregnancy rates of gonadotropin-releasing hormone (GnRH) antagonist in vitro fertilization/intracytoplasmic sperm injection (IVF/ICSI) cycles with the transfer of embryos at different developmental stages (day-3 versus day-5 ETs).

Material And Methods: This is a retrospective analysis of fresh IVF/ICSI; 194 cycles out of 2676 conducted in a single center.

Results: A total of 2676 cycles were analyzed, of which 386 had no progesterone measurements available.

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Labial fusion usually affects prepubertal girls and postmenopausal women, it may rarely occurs in reproductive years in the absence of predisposing factors such as vulvar infections, dermatitis, trauma, female circumcision and lichen sclerosis. Should be considered in differential diagnosis in the differential diagnosis of urinary retention even if the patient doesn't have history of sexual intercourse.

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Objective: To see whether the oocytes retrieved from an ovary with an endometrioma would develop into embryos with aberrant timings of cleavage as assessed using time-lapse monitoring (TLM) and poorer morphologic quality compared with sibling oocytes from the contralateral ovary with no endometrioma in the same patient after intracytoplasmic sperm injection.

Methods: This was an observational prospective study at an in vitro fertilization (IVF) center of a private hospital. It included analysis and comparison of 128 embryos (69 embryos developed from the ovary with endometrioma and 59 embryos from the contralateral ovary without endometrioma serving as controls from a total of 20 women with infertility).

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Background: Klinefelter syndrome (KS) is the most common sex chromosomal disorder in males and historically patients have been labeled as sterile. After the introduction of microdissection testicular sperm extraction (micro-TESE), successful sperm retrievals for intracytoplasmic sperm injection (ICSI) have been reported.

Materials And Methods: A retrospective study was undertaken on ten patients with non-mosaic KS undergoing micro-TESE for ICSI.

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Unlabelled: The aim of this study was to measure circulating and intrafollicular concentrations of three inflammatory cytokines from women undergoing ovarian stimulation in order to determine their prognostic value in the outcome of intracytoplasmic sperm injection/embryo transfer cycles.

Materials And Methods: A total of 72 women following ovarian stimulation and intracytoplasmic sperm injection were included. Blood serum samples were drawn at the day of chorionic gonadotropin administration.

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Transient osteoporosis of pregnancy is a rarely observed skeletal pathology developing in the last months of pregnancy. Meticulous evaluation is important for the differential diagnosis of severe and progressive hip and/or groin pain in pregnant patients. MRI is a valuable and safe technique for demonstrating bone marrow edema and skeletal abnormalities during pregnancy.

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Objective: The aim of the study was to compare the outcome of pregnancies with cerclage placement in which cervical length was <15 mm and 15-25 mm. We further investigated the impact of cervical dilatation on delivery at <34 weeks.

Material And Methods: Women with singleton gestations with cerclage placement due to cervical insufficiency were enrolled into the study.

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Multifetal pregnancy reduction (MFPR) offers a therapeutic option which reduces the maternal, prenatal, neonatal morbidity and mortality associated with multifetal pregnancies. In certain cases of MFPR, where difficulty is encountered in reaching the thorax due to the fetal position as well as the location of membranes and placenta, an alternative approach may be the insertion of the needle to the fetal cranium. We describe a new technique for MFPR performed by fetal intracranial injection of potassium chloride.

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Objective: To present a case of laparoscopic removal of a heterotopic cesarean scar pregnancy under ultrasound guidance.

Design: Case report.

Setting: Private hospital.

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Background: In non-obstructive azoospermic patients (NOA) besides the mechanical treatment, vital spermatozoa from the tissue obtained from testes by biopsy can be enzymatically prepared.

Objective: To increase the sperm recovery success of testicular sperm extraction (TESE), suitable for ICSI.

Study Design: Prospective, clinical study.

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Objective: To assess the effects of hormone replacement therapy (HRT) on endometrial thickness as measured by transvaginal ultrasonography in asymptomatic, postmenopausal women.

Study Design: Between 1997 and 2001, 307 women who had no risk factors for endometrial cancer or abnormal vaginal bleeding were enrolled in a study. Patients received 1 of the following HRT modalities: (1) oral equine HRT modalities: (1) oral equine estrogen, (2) oral 17beta-estrogen, (3) transdermal 17beta-estrogen, or (4) oral tibolone.

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Background: Cytokines play an important but controversial role during ovarian folliculogenesis for the development of mature and fertilizable oocytes. In this study, leptin, interleukin-1beta (IL1beta), tumor necrosis factor-alpha (TNFalpha) and vascular endothelial growth factor (VEGF) in serum and follicular fluids (FF) of women undergoing ovarian hyperstimulation were evaluated as prognostic markers of the outcome of intracytoplasmic sperm injection (ICSI) cycles.

Materials And Methods: Ninety-five ICSI cycles were included in the study.

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