Yunus Aydın

Yunus Aydın


Research Focus & Metrics

Academic Career Length

19Years (2008-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 August 2015 in Journal of Pediatric and Adolescent Gynecology
Verified
Journal Article
Closed access
YAYunus Aydın
Yunus Aydın
HHHikmet Hassa
Hikmet Hassa
DBDerya Burkankulu
Derya Burkankulu
DADidem Arslantas
Didem Arslantas
DSDeniz Sayiner
Deniz Sayiner
NONebahat Ozerdogan
Nebahat Ozerdogan

15 September 2014 in Journal of the Turkish-German Gynecological Association
Verified
Journal Article
Closed access
HHHikmet Hassa
Hikmet Hassa
YAYunus Aydın
Yunus Aydın
FTFulya Taplamacioglu
Fulya Taplamacioglu
In assisted reproductive technology (ART), high embryo quality is closely related to high-quality oocytes. Cytoplasmic maturation and extracytoplasmic maturation are the most important components in determining oocyte quality. One of the most important components of extracytoplasmic maturation is perivitelline abnormalities. The aim of this study is to determine the effect of perivitelline abnormalities on the development of high-quality embryos. The study material consisted of 217 of 1154 oocytes from 98 intracytoplasmic sperm injection (ICSI) cycles undertaken due to male factor infertility. Only cycles with long gonadotropin-releasing hormone analogs combined with recombinant Follicle-stimulating hormone (rec-FSH) were included in study. We compared 105 metaphase-II oocytes that had dominantly perivitelline space abnormalities (large perivitelline space with or without granules) with 112 normal metaphase-II oocytes, based on the embryo grade determined by Alpha Scientists in Reproductive Medicine and the European Society of Human Reproduction and Embryology (ESHRE) Special Interest Group of Embryology. Normal metaphase-II oocytes were characterized by a round, clear zona pellucida; a small perivitelline space containing a single unfragmented first polar body; and a pale, moderately granular cytoplasm with no inclusions. The development rates of Grade I, II, and III embryos were 68.5%, 23.8%, and 7.7%, respectively, in the 105 oocytes with perivitelline abnormalities. The development rates of Grade I, II, and III embryos were 82.1%, 17.9%, and 0%, respectively, in the 112 morphologically normal oocytes. When compared with normal oocytes, Grade I (68.5% vs. 82.1%, p value; 0.019) and Grade III (7.7% vs. 0%, p value; 0.003) embryo development rates were significantly lower in oocytes that had perivitelline abnormalities. It is important to analyze oocyte quality using multiple parameters, including the perivitelline space. Perivitelline space abnormalities might negatively affect embryo development in male factor-infertile couples that are stimulated with rec-FSH. Therefore, when choosing embryos for transfer, we must take into consideration the historical oocyte data.

1 October 2013 in European Journal of Obstetrics & Gynecology and Reproductive Biology
Verified
Journal Article
Closed access
YAYunus Aydın
Yunus Aydın
HHHikmet Hassa
Hikmet Hassa
TOTufan Oge
Tufan Oge
VTV. Yavuz Tokgoz
V. Yavuz Tokgoz

31 October 2013 in Human Fertility
Verified
Journal Article
Closed access
YAYunus Aydın
Yunus Aydın
HHHikmet Hassa
Hikmet Hassa
TOTufan Oge
Tufan Oge
VTVehbi Yavuz Tokgoz
Vehbi Yavuz Tokgoz
The objective of this study was to evaluate the factors predictive of clinical pregnancy in the first superovulation/intrauterine insemination (SO/IUI) cycle of couples with favourable female characteristics. We analyzed retrospectively the first SO/IUI cycle of 306 infertile couples with mild male factor infertility and unexplained infertility. The women had a favourable prognosis in terms of ovarian reserve. Univariate logistic regression analyses identified body mass index (BMI) [odds ratio (OR) = 0.9, P = 0.014], sperm concentration [OR = 1.007, P = 0.007] and inseminating motile sperm count (IMC) [OR = 1.007, P = 0.032] as significant predictive factors of clinical pregnancy. Multivariate logistic regression analysis identified BMI [OR = 0.87, P = 0.008] and sperm concentration [OR = 1.008, P = 0.011] as significant factors. Pregnant and non-pregnant groups did not differ significantly in terms of the age and smoking status of the woman, duration and type of infertility, length of the stimulation, total gonadotropin dosage or antral follicle count. Of the female characteristics investigated, BMI was the most significant predictive factor of clinical pregnancy in the first SO/IUI cycle of couples with unexplained or mild male factor infertility and favourable female characteristics. In overweight women, weight loss should be advised before starting SO/IUI. Sperm concentration and IMC were significant male predictive factors for clinical pregnancy in the first SO/IUI.

11 February 2015 in Systems Biology in Reproductive Medicine
Verified
Journal Article
Closed access
PDF file
HHHikmet Hassa
Hikmet Hassa
YAYunus Aydın
Yunus Aydın
OÖOrhan Özatik
Orhan Özatik
KEKevser Erol
Kevser Erol
YOYasemin Ozatik
Yasemin Ozatik
The objective of this study was to determine whether there are changes in primary, primordial, and growing follicles after dehydroepiandrosterone (DHEA) administration in rats that have diminished ovarian reserve (DOR) due to 4-vinylcyclohexene diepoxide (VCD) application, and to examine the mechanism of the probable effect of DHEA on folliculogenesis. Two groups of Wistar rats were used. In Group A unilateral oophorectomy (eight rats) was carried out on day-0. The remaining study ovary was removed by relaparotomy after VCD (160 mg/kg, intraperitoneally) was administered for 15 days. In Group B unilateral oophorectomy (eight rats) was carried out on day-0. The remaining study ovary was removed by relaparotomy after VCD (160 mg/kg, intraperitoneally) administration for 15 days followed by DHEA (60 mg/kg body weight) daily for 45 days. Primordial, primary, and growing (secondary + antral) follicles were counted in 1,664 sections from 32 ovaries. In all three types of follicles (primordial, primary, and growing), the number of follicles significantly decreased in the study ovaries compared to the control ovaries in both Group A and Group B. In Group B, atresia rates were significantly lower in the study ovary compared to the control ovary in all of the follicular groups: primordial (p = 0.02), primary (p = 0.01), and growing (p = .027). To demonstrate the probable effects of DHEA on follicular dynamics, we also compared the study ovaries in both groups; the primordial (p = 0.027), primary (p = 0.031), and growing (p = 0.04) number of follicles were significantly higher in Group B compared to Group A. In conclusion, our findings suggest that DHEA administration in DOR rats due to VCD results in a larger follicular pool. Decreased atresia may be one of the possible effects of DHEA in DOR cases. Whatever the mechanism, DHEA treatment potentially may be useful clinically as a means to increase the number of gonadotropin-responsive follicles for ovarian stimulation.

20 December 2013 in Journal of Obstetrics and Gynaecology
Verified
Journal Article
Closed access
HHH. Hassa
H. Hassa
YAYunus Aydın
Yunus Aydın
The advancement of new perspectives in assisted reproductive technology (ART) through the use of modern infertility evaluation techniques has led clinicians to reassess how infertility should best be treated. The usefulness of laparoscopy in the diagnostic work-up of infertile patients or in patients who are unresponsive to fertility treatments is debatable. The purpose of this review is to define the role of laparoscopy in the management of infertility, which is one of the most controversial aspects of reproductive medicine. To the best of our knowledge, laparoscopy is currently not a routine step in the evaluation of infertile women; every patient and clinical condition must be assessed individually. In this review, we investigated the effectiveness and the utility of laparoscopy as a diagnostic and therapeutic tool in the management of infertility. Various topics and parameters in ART will be discussed based on the evidence that is currently available.