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Dive into the research topics where Gurkan Bozdag is active.

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Featured researches published by Gurkan Bozdag.


Human Reproduction | 2012

Prevalence, phenotype and cardiometabolic risk of polycystic ovary syndrome under different diagnostic criteria

Bulent O. Yildiz; Gurkan Bozdag; Zuhal Yapıcı; Ibrahim Esinler; Hakan Yarali

STUDY QUESTION What is the prevalence, phenotype and metabolic features of polycystic ovary syndrome (PCOS) in the same population according to three different diagnostic criteria? SUMMARY ANSWER The prevalence of PCOS under National Institutes of Health (NIH), Rotterdam and Androgen Excess and PCOS (AE-PCOS) Society criteria was 6.1, 19.9 and 15.3%, respectively. PCOS carried a 2-fold increased risk of metabolic syndrome regardless of the diagnostic criteria used. WHAT IS KNOWN AND WHAT THIS PAPER ADDS The prevalence rates of PCOS differ depending on the diagnostic criteria used to define the syndrome. The current paper gives the prevalence rates of the component and composite phenotypes of PCOS in the same population and reports similar rates of metabolic syndrome in women with PCOS under contrasting diagnostic criteria. DESIGN In this cross-sectional study, 392 women between the ages of 18 and 45 years were analyzed. PARTICIPANTS AND SETTING When the prevalence of PCOS according to NIH was set to 8% with a precision of 2.2% and confidence interval of 95%, the sample size required for a prevalence survey was found to be 400 subjects. The study was carried out in the General Directorate of Mineral Research and Exploration, a government-based institute, in which the largest number of female staff (n = 527) are employed within a single institute in Ankara, Turkey. The study was performed between 7 December 2009 and 30 April 2010. All female subjects between the ages of 18 and 45 years were invited to participate. Women older than 45 or younger than 18 years, post-menopausal women, women with a history of hysterectomy or bilateral oopherectomy and pregnant women were excluded. Totally, 392 of the employees were recruited for the final analyses. MAIN RESULTS AND THE ROLE OF CHANCE The prevalence of PCOS under NIH, Rotterdam and AE-PCOS Society criteria were 6.1, 19.9 and 15.3%, respectively. While the prevalence of metabolic syndrome was 6.1% in the whole study group, within the patients diagnosed as PCOS according to NIH, Rotterdam and AE-PCOS Society criteria, it was 12.5, 10.3 and 10.0%, respectively. BIAS, CONFOUNDING AND OTHER REASONS FOR CAUTION Even though we have included women working at a single institution with a high response rate for the participation, we cannot exclude potential selection bias due to undetermined differences between our sample and background community. We might have underestimated actual prevalence of metabolic syndrome in PCOS due to lack of oral glucose tolerance test 2 h glucose data. GENERALIZABILITY TO OTHER POPULATIONS Current results can be generalized to Caucasian populations and may present variations in other populations according to race and ethnicity. STUDY FUNDING/COMPETING INTEREST(S) This work was, in part, sponsored by Merck Serono. TRIAL REGISTRATION NUMBER Not applicable.


Reproductive Biomedicine Online | 2008

Impact of isolated obesity on ICSI outcome

Ibrahim Esinler; Gurkan Bozdag; Hakan Yarali

The aim of this study was to assess the impact of isolated obesity on the outcome of intracytoplasmic sperm injection (ICSI). A total of 775 patients undergoing 1113 ICSI cycles were categorized on the basis of body mass index (BMI): group 1 (BMI 18.5-24.9 kg/m(2); normal weight; n = 627 cycles), group 2 (BMI 25.0-29.9 kg/m m(2); overweight; n = 339 cycles) and group 3 (BMI >or=30 kg/m(2); obese; n = 147 cycles). Sixty-three (10.0%) cycles in group 1, 53 (15.6%) cycles in group 2 and 26 cycles (17.7%) in group 3 were cancelled (P < 0.05 for group 1 versus groups 2 and 3). Despite the significantly higher total gonadotrophin consumption in groups 2 and 3 compared with group 1, the mean serum oestradiol level on the day of human chorionic gonadotrophin administration was significantly higher in group 1 (P < 0.05). The number of cumulus-oocyte complexes, metaphase II oocytes, and two-pronucleated oocytes were significantly lower in group 3 compared with group 1 (P < 0.05). However, fertilization rate, the mean number of embryos transferred, the mean number of grade 1 embryos transferred, clinical pregnancy, implantation, multiple pregnancy and miscarriage rates were comparable among the three groups. The rate of cycles with cryopreservable embryos was significantly lower in groups 2 and 3 compared with group 1 (P < 0.05).


Human Reproduction | 2011

Depression, anxiety and cardiometabolic risk in polycystic ovary syndrome

Nese Cinar; Muhammed Cemal Kizilarslanoglu; Ayla Harmanci; Duygu Yazgan Aksoy; Gurkan Bozdag; Basaran Demir; Bulent O. Yildiz

BACKGROUND Polycystic ovary syndrome (PCOS) is associated with psychological and metabolic disturbances. The aim of this study was to determine whether depression, anxiety and reduced health-related quality of life (HRQOL) are more common in women with PCOS and associated with metabolic risk. METHODS The study included 226 PCOS patients and 85 BMI-matched healthy control women. All participants completed standardized questionnaires assessing depression (Beck Depression Inventory), anxiety (State-Trait Anxiety Inventory) and both depression and anxiety (Hospital Anxiety and Depression Scale and General Health Questionnaire). Patients also completed a PCOS HRQOL questionnaire. Hirsutism scores, serum androgens and lipids were obtained. All subjects underwent a standard oral glucose tolerance test. RESULTS 28.6% of PCOS women versus 4.7% of control women had clinical depression scores indicating an 8.1-fold increased risk of depression in PCOS (P < 0.001). Depression and anxiety scores were higher in PCOS women than controls (P < 0.01 for all subscales). Obese PCOS subjects had higher depression scores and rates than non-obese PCOS women (P < 0.05). Depression scores were significantly correlated with insulin resistance and lipid parameters and with the number of components comprising the metabolic syndrome. Menstrual and hirsutism problems were the most serious concerns followed by emotional problems on the HRQOL. CONCLUSIONS Depression and anxiety are more common in patients with PCOS compared with healthy women. Depression in PCOS might be associated with obesity and metabolic abnormalities including insulin resistance and dyslipidemia.


Reproductive Biomedicine Online | 2008

What is the role of office hysteroscopy in women with failed IVF cycles

Gurkan Bozdag; Guldeniz Aksan; Ibrahim Esinler; Hakan Yarali

Recurrent implantation failure (RlF) may be due to unrecognized uterine pathology. Hysterosalpingography, transvaginal ultrasonography, saline infusion sonography and hysteroscopy are the tools to assess the inner architecture of the uterus. Hysteroscopy is considered to be the gold standard; however, the validity of hysteroscopy may be limited in the diagnosis of endometritis and endometrial hyperplasia. The frequencies of unrecognized uterine pathology revealed by hysteroscopy are 18-50% and 40-43% in patients undergoing IVF with or without RlF, respectively. Endometrial polyps may be associated with increased miscarriage rates. Implantation rates are decreased in patients with submucous or intramural fibroids with distorted uterine cavity. There is controversy on the impact of uterine septum less than 1 cm length on pregnancy outcome in IVF cycles. There is paucity of data on the role of hysteroscopy in failed IVF cycles. In the available two randomized controlled trials, pregnancy rates appear to be increased when hysteroscopy is performed; however within the hysteroscopy group, pregnancy rates are comparable among the normal or surgically corrected subgroups. Further studies are warranted to delineate the role of hysteroscopy in patients with failed IVF cycle(s). This review aims to evaluate the validity of office hysteroscopy in failed IVF cycles.


Fertility and Sterility | 2009

Antagonist/letrozole protocol in poor ovarian responders for intracytoplasmic sperm injection: a comparative study with the microdose flare-up protocol

Hakan Yarali; Ibrahim Esinler; Mehtap Polat; Gurkan Bozdag; Bulent Tiras

OBJECTIVE To compare the effect of the GnRH antagonist/letrozole protocol (AL) with the microdose GnRH agonist flare-up (MF) protocol in poor ovarian responders for intracytoplasmic sperm injection (ICSI). DESIGN Retrospective, case-control study. SETTING Anatolia Women and IVF Center. PATIENT(S) Eight hundred eighty-five consecutive patients (1383 cycles) predicted to have or with a history of poor ovarian response who were undergoing ICSI were enrolled. The MF protocol was used in 673 patients (1026 cycles), and the AL protocol was used in the remaining 212 patients (357 cycles). INTERVENTION(S) Controlled ovarian hyperstimulation and ICSI. MAIN OUTCOME MEASUREMENT(S) Cycle cancellation rate, number of oocytes retrieved, fertilization rate, embryo quality, clinical pregnancy, and implantation rates. RESULT(S) The total gonadotropin consumption, duration of stimulation, E(2) level on the day of hCG administration, and number of oocytes retrieved were significantly lower with the AL protocol compared with the MF protocol. However, the fertilization rate and the rate of at least one top-quality embryo transferred were higher with the AL compared with the MF protocol. The clinical pregnancy rates were comparable between the two groups. The implantation rates with the MF and AL protocols were 9.8% and 14.5%, respectively. CONCLUSION(S) The GnRH AL protocol is an effective protocol that may be used in poor ovarian responders for ICSI.


Reproductive Biomedicine Online | 2009

TESE-ICSI in patients with non-mosaic Klinefelter syndrome: a comparative study.

Hakan Yarali; Mehtap Polat; Gurkan Bozdag; Mufit Gunel; Idil Alpas; Ibrahim Esinler; Utku Dogan; Bulent Tiras

There are limited data in the literature on the performance of testicular sperm extraction (TESE) and intracytoplasmic sperm injection (ICSI) treatment in patients with Klinefelter syndrome. The current study compared TESE-ICSI treatment in patients with non-mosaic Klinefelter syndrome with controls having non-obstructive azoospermia and normal karyotype. Thirty-three consecutive patients (39 TESE-ICSI cycles) with Klinefelter syndrome (study group) and 113 consecutive patients (130 TESE-ICSI cycles) with non-obstructive azoospermia and normal karyotype (control group) were recruited in a private IVF setting. In the two groups, the mean ages of the men at the time of TESE were 32.0 +/- 6.4 and 34.3 +/- 5.8 years respectively (P < 0.05) and the successful sperm recovery rates per total TESE attempts were 56 (22/39) and 44% (57/130) respectively. Similarly, fertilization rates were comparable between the two groups. In the Klinefelter syndrome group, following biopsy and fluorescence in-situ hybridization, a normal karyotype was obtained in 42 of the 71 embryos (59%). The clinical pregnancy and implantation rates in the study and control groups were similar (39, 23 and 33, 26% respectively). In conclusion, patients with non-mosaic Klinefelter syndrome have sperm recovery and pregnancy rates comparable with patients having non-obstructive azoospermia and normal karyotype.


International Journal of Gynecological Cancer | 2007

Ascites and epithelial ovarian cancers: a reappraisal with respect to different aspects

A. Ayhan; Murat Gultekin; Cagatay Taskiran; Polat Dursun; P. Firat; Gurkan Bozdag; Nilufer Celik; Kunter Yuce

Ascites is a common finding in patients with epithelial ovarian cancer (EOC). Clinico-pathologic correlations with respect to the presence of ascites, positive cytology and prognostic role of ascites, and the impact of ascitic volumes were not previously studied extensively. A total of 372 patients with EOC were retrospectively evaluated with respect to presence and amount of ascites, cytologic findings, and survival. Two groups were compared by using Chi-square, Students t and Mann-Whitney U, binary logistic regression, Kaplan Meier and Cox-regression analysis tests, where appropriate. Omental metastasis (P < 0.001; OR: 3.21, 95% CI = 1.945–5.297) and mean number of metastatic lymph nodes (P= 0.008; OR: 1.063, 95% CI = 1.016–1.112) were significantly related with presence of ascites. Evaluation of ascitic volume at different thresholds revealed lymphatic-omental metastasis, and also the disease stage to be significantly different among patient groups at lower threshold values and the positive cytology and high-grade diseases at higher threshold values. In conclusion, presence of ascites correlates with both the intraperitoneal and also the retroperitoneal tumor spread. Amount of ascites has different correlations with the clinico-pathologic factors depending on the thresholds chosen. At lower volumes, lymphatic and omental metastasis seems to correlate with the development of ascites. Once ascites develops, tumor grade seems to be important for larger ascites volumes. Neither the presence of ascites or its volume nor the cytologic positivity was an independent predictor of survival.


Gynecologic and Obstetric Investigation | 2012

Endometrioma ^ 3 cm in Diameter per se Does Not Affect Ovarian Reserve in Intracytoplasmic Sperm Injection Cycles

Ibrahim Esinler; Gurkan Bozdag; Ilker Arikan; Bulent Demir; Hakan Yarali

Background: Our aim was to determine the effect of single endometriomas ≤3 cm in diameter per se on ovarian reserve in intracytoplasmic sperm injection (ICSI) cycles. Methods: We enrolled 19 consecutive infertile patients (29 cycles) who had unilateral single endometriomas ≤3 cm in diameter and who underwent ICSI. Results: The mean age of the patients was 33.3 ± 4.9 years. The mean diameter of endometriomas was 21.8 ± 4.9 mm. Left- and right-sided endometriomas were 34.5 and 65.5%, respectively. The number of oocytes retrieved from ovaries with endometriomas and contralateral normal ovaries was comparable (5.9 ± 4.3 vs. 5.4 ± 3.8). Conclusion: Endometriomas ≤3 cm in diameter per se did not have a deleterious effect on ovarian reserve in ICSI cycles.


Reproductive Biomedicine Online | 2010

Visfatin and retinol-binding protein 4 concentrations in lean, glucose-tolerant women with PCOS.

Bulent O. Yildiz; Gurkan Bozdag; Umit Otegen; Ayla Harmanci; Kubra Boynukalin; Zehra Vural; Serafettin Kirazli; Hakan Yarali

Since insulin resistance is accepted to be a common feature of polycystic ovary syndrome (PCOS), the exact molecular mechanism(s) involved in glucose and lipid metabolism have been under investigation in the syndrome. Recently, two novel adipokines, namely visfatin and retinol-binding protein 4 (RBP4), have been suggested to play a role in insulin resistance and diabetes. This study sought to determine whether plasma concentrations of visfatin and RBP4 are altered in PCOS by comparing a total of 27 lean, normal glucose-tolerant PCOS patients with 19 age- and body mass index-matched healthy controls. The mean plasma visfatin concentrations were higher in PCOS patients than those in healthy subjects (37.9+/-18.2 versus 19.8+/-17.5, P<0.01), while RBP4 concentrations were similar between the two. Both adipokines were correlated with each other in the whole (r=0.50, P<0.01) and in PCOS (r=0.52, P<0.01) groups but not in controls. The results suggest that lean, glucose-tolerant women with PCOS have increased circulating visfatin and unaltered RBP4 concentrations compared with healthy lean women. In order to clarify overlapping effects and their potential contribution to the pathophysiology of PCOS, further studies are needed.


Contraception | 2013

Body composition in lean women with polycystic ovary syndrome: effect of ethinyl estradiol and drospirenone combination

Kadriye Aydin; Nese Cinar; Duygu Yazgan Aksoy; Gurkan Bozdag; Bulent O. Yildiz

BACKGROUND Limited data are available regarding the potential effects of oral contraceptives (OCs) on body fat distribution particularly in lean women with polycystic ovary syndrome (PCOS). In the current study, we aimed to evaluate the influence of ethinyl estradiol and drospirenone on body composition. STUDY DESIGN Participants included 28 lean patients with PCOS and 28 age- and body mass index (BMI)-matched healthy women. The PCOS patients received ethinyl estradiol 30 mcg/drospirenone 3 mg for 6 months. Body composition parameters were assessed by bioelectrical impedance analysis. Serum androgens, lipids, insulin resistance and glucose metabolism measures were also determined. RESULTS At baseline, the PCOS patients and controls had similar body composition, lipids, insulin resistance and glucose metabolism parameters. Total and trunk fat percentages were negatively correlated with sex hormone binding globulin and were positively correlated with homeostatic model assessment of insulin resistance and free androgen index in the PCOS group.. After 6 months of treatment in the PCOS patients, total fat percentage increased from 24.5%±7.1% to 26.0%±6.1% (p=.035) and trunk fat percentage increased from 20.2%±8.9% to 22.2%±7.1% (p=.014), although weight, BMI and waist to hip ratio (WHR) remained unchanged. CONCLUSION Lean women with PCOS have similar body composition compared to healthy women. OC therapy for 6 months in PCOS patients results in an increased total and trunk fat percentage despite no change in clinical anthropometric measures including weight, BMI and WHR.

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T. Aksu

Hacettepe University

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A. Sever

Hacettepe University

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