Search Results
Results 151 - 200 of 1423
1 2 3 4 5 6 7 8 9 10 >
Lefèvre Brigitte - - 2008
The mammalian oocyte is a round cell arrested at prophase I of meiosis. It is characterized by the presence of a large nucleus, called the germinal vesicle, in the middle of which is the nucleolus. Before it can be fertilized, the oocyte must resume meiosis, enter metaphase II and be ...
Konc Janos - - 2008
The human mature oocyte is particularly sensitive to cooling and low temperatures in addition to freeze-thaw damage. The efficiency of oocyte cryopreservation including the pregnancy outcome is still low. The aim of our study is to briefly introduce our preliminary clinical results achieved with oocyte cryopreservation (CP). Our work focused ...
Noorashikin M - - 2008
Low dose stimulation (LS) is emerging as an alternative regime in assisted reproductive technology (ART). This study aimed to compare the cost-effectiveness of LS to the high dose GnRH antagonist (Atg) regime. An observational prospective study conducted at an academic infertility unit from January to June 2007. Outcome measures included ...
Oakes Meghan B - - 2008
OBJECTIVE: To examine a case of clinical pregnancy following oocyte and day 3 embryo vitrification. DESIGN: Case report. SETTING: Huntington Centro de Medicina Reprodutiva, a private infertility clinic, in São Paolo, Brazil. PATIENT(S): A 31-year-old woman, gravida 1, para 1, with polycystic ovary syndrome. INTERVENTION(S): In vitro fertilization with oocyte ...
Zhao Jun-Zhao - - 2009
OBJECTIVE: To evaluate the effects of in vitro maturation and fertilization of oocytes from unstimulated ovaries in infertile women with polycystic ovary syndrome (PCOS). DESIGN: Retrospective study. SETTING: Reproductive Medicine Center, First Affiliated Hospital of Wenzhou Medical College, People's Republic of China. PATIENT(S): One hundred eighteen women with PCOS undergoing ...
Chian Ri-Cheng - - 2009
OBJECTIVE: To evaluate obstetric outcomes with oocyte vitrification after ovarian stimulation (OS) and in vitro maturation (IVM) of immature oocytes. DESIGN: A prospective trial from October 2003 to April 2007. SETTING: University-based medical center. PATIENT(S): OS group: 38 patients undergoing intrauterine insemination who overresponded to OS. IVM group: 20 patients ...
Son Weon-Young - - 2008
Our aim was to evaluate whether extending the interval between human chorionic gonadotrophin (hCG) priming and immature oocyte retrieval increases the oocyte maturation rate following in vitro maturation (IVM). This study was performed retrospectively. IVM was performed on 113 polycystic ovary syndrome patients (n = 120 cycles). Oocyte collection was ...
Falcone Patrizia - - 2008
BACKGROUND AND AIM: Both nuclear and cytoplasmic maturation of oocytes have to be completed in a coordinated manner to ensure optimal conditions for fertilization. This is well known for in vitro fertilization, but is debated for intracytoplasmic sperm injection (ICSI). It has been reported that preincubation of oocytes prior to ...
Suikkari Anne-Maria - - 2008
PURPOSE OF REVIEW: In-vitro maturation of oocytes was primarily developed to make in-vitro fertilization safer and simpler for women with polycystic ovaries and high risk of ovarian hyperstimulation syndrome. In-vitro maturation has potentially many advantages over conventional in-vitro fertilization. A simple protocol with decreased or no hormonal stimulation before oocyte ...
Choi Wonjae - - 2008
This paper reports a new dielectrophoretic separation method of porcine oocytes for in vitro fertilization. Conventional manual selection of oocyte highly depends on the expert's experience and lacks universal standards for identifying the quality of oocyte. In this study, an electrode array chip with castellated shape was developed to evaluate ...
Chang Hye Jin - - 2008
The preservation of fertility in female cancer survivors has become an important health issue. The different cryopreservation options available for fertility preservation are embryo, oocyte, and ovarian tissue cryopreservation. Oocyte cryopreservation is available for women without partners, but there is a limited experience with this technique and the pregnancy rate ...
Gou Ke-Mian - - 2009
The practicality of using juvenile in vitro embryo transfer (JIVET) on a field scale in China was evaluated in each of three seasons (summer, autumn and winter) from 2006 to 2007. A total of 102 donor Merino lambs (18 summer, 69 autumn and 15 winter) aged 4-8 weeks were stimulated ...
Parmegiani L - - 2008
BACKGROUND: A number of factors influence the success of oocyte cryopreservation and subsequent ICSI. The aim of the present study is to establish the ideal time, after oocyte retrieval, for human oocyte cryopreservation via slow freezing/rapid thawing protocol with 0.3 M sucrose concentration in cryoprotectant solution (SF/RT 0.3 M). METHODS: ...
Chian Ri-Cheng - - 2008
Cryopreservation of oocytes by vitrification is a promising new technique for assisted human reproduction. Any new technical development must be accompanied with data concerning obstetric and perinatal outcome. This study analysed the obstetric and perinatal outcomes in 165 pregnancies and 200 infants conceived following oocyte vitrification cycles in three assisted ...
Detti Laura - - 2008
PURPOSE: To evaluate whether oocyte quality, implantation and pregnancy outcomes in in vitro fertilization (IVF)/intra-cytoplasmic sperm injection (ICSI) are related to the duration of gonadotropin-releasing hormone (GnRH)-antagonist use or the timing of its initiation. METHODS: Retrospective cohort study of 178 conventional IVF/ICSI cycles. All patients underwent ovarian stimulation with gonadotropins ...
Hsu Chao-Chin - - 2008
Intermittent vaginal administration of recombinant human FSH (rhFSH), for ovarian stimulation in IVF employing the concept of uterine first-pass effect and mesotherapy, was investigated. Injection of rhFSH (437 IU, counted as six ampoules) was carried out every 3 days into the vaginal mucosa of 66 participants receiving IVF treatment between ...
Manipalviratn Somjate - - 2008
In recent years, the success of human oocyte cryopreservation has improved dramatically. Currently, there are a couple hundred babies born worldwide with the use of cryopreserved oocytes. The oocyte survival after freezing/thawing process is in the range of 70-95%, comparable to embryo cryopreservation, depending on techniques used. With the change ...
Doody Kevin J - - 2009
OBJECTIVE: To assess the efficacy and safety of a vaginal progesterone (P(4)) insert (Endometrin) for luteal support for assisted reproductive technology (ART). DESIGN: Multicenter, randomized, open-label (assessor-blinded) phase III clinical trial. SETTING: Twenty-five U.S. ART centers. PATIENT(S): A total of 1,211 ART patients randomized to three groups: Endometrin 100 mg ...
Parmegiani Lodovico - - 2008
OBJECTIVE: To report a live birth after the transfer of a single blastocyst derived from a human oocyte cryopreserved for 5 years. DESIGN: Case report. SETTING: Private assisted reproduction center. PATIENT(S): A 39-year-old woman with tubal infertility and her partner with male-related infertility. INTERVENTION(S): Oocyte cryopreservation (in 1.5 mol/L 1,2-propanediol ...
Zhang Y L - - 2008
The objective was to investigate the effect of phytohemagglutinin (PHA) on the fusion of mammary gland epithelial (MGE) cells into enucleated oocytes in goats. The toxicity of PHA was evaluated by testing its effect on the development of parthenogenetic caprine oocytes. The effective dose and duration of PHA treatment (100 ...
Chernyshov Victor P - - 2008
PROBLEM: Positive obstetric outcome of allogenic in vitro fertilization (IVF) pregnancies makes interesting the subject of additional regulatory mechanisms after oocyte donation. METHOD OF STUDY: Eighty eight women: 23 donation of oocytes (DO), 33 IVF, 32 natural conception (NC) were studied in first trimester of pregnancy. Intracellular production of cytokines ...
Naoi H - - 2008
This study was conducted to examine the effects of the reproductive cycle of donor cat on the quality of oocytes at recovery and developmental competence of oocytes after in vitro fertilization (IVF) and somatic cell nuclear transfer (NT). Based on the presence or absence of follicles and corpora lutea, the ...
Martínez Francisca - - 2008
AIM: To compare the clinical pregnancy rate in recipients of oocytes from donors treated with leuprorelin + human menopausal gonadotropins (hMG) with that obtained when the donors were treated with ganirelix + recombinant follicle-stimulating hormone (rFSH). The secondary aim was to compare the donors' response to the two treatments. METHOD: ...
Leroy J L M R - - 2008
Fertility in high yielding dairy cows is declining, and there is increasing evidence to presume that oocyte and embryo quality are major factors in the complex pathogenesis of reproductive failure. In this report we present an overview of possible mechanisms linking negative energy balance (NEB) and deficiencies in oocyte and ...
Spinaci M - - 2008
The beneficial properties of green tea and especially of its principal active polyphenol, epigallocatechin-3-gallate (EGCG), have led to an increased demand for dietary supplements with highly enriched EGCG concentrations. In order to investigate the possible reproductive-related consequence of EGCG supplementation, the effects of this catechin on in vitro maturation (IVM) ...
Hammadieh Nahed - - 2008
BACKGROUND: Hydrosalpinges have adverse effects on IVF outcomes. Salpingectomy is effective in improving outcomes, but it is not always practical or safe. Ultrasound-guided aspiration of hydrosalpinges at oocyte collection is an option for those who develop hydrosalpinges during controlled ovarian stimulation; however, there is no randomized evidence to show whether ...
Akagi Satoshi - - 2008
We examined the effects of the source of recipient oocytes and timing of fusion and activation on the development competence of bovine nuclear transferred (NT) embryos derived from fresh cumulus cells isolated immediately after collection by ovum pickup (OPU). As recipient cytoplasts, we used in vivo-matured oocytes collected from hormone-treated ...
Chen Gui An - - 2008
OBJECTIVE: To describe the birth achieved from frozen embryos after intracytoplasmic sperm injection (ICSI) of donor sperm into vitrified oocytes. PATIENT: A 25-year-old woman whose husband was azoospermic undergoing IVF therapy. METHODS: Oocytes collected after ovarian stimulation were vitrified, thawed, and fertilized by frozen donor sperm. RESULTS: Nineteen oocytes were ...
Soares Sérgio Reis - - 2008
OBJECTIVE: To provide a summary of the actual knowledge about the clinical factors affecting the oocyte recipient (other than those associated with uterine cavity abnormalities) on the outcome of oocyte donation cycles. DESIGN: Review of the literature. SETTING: Information regarding the association between age, body mass index (BMI), endometrial priming, ...
Kavoussi Shahryar K - - 2008
BACKGROUND: Turner syndrome (TS) is the most common sex chromosome anomaly. Spontaneous pregnancies have been reported in a small percentage of women with TS, particularly those with mosaicism. However, due to accelerated follicular atresia, the majority of TS patients undergo ovarian failure prior to or around the time of puberty. ...
Chang Ching-Chien - - 2008
Recent clinical reports not only show that cryopreserved embryos can be successfully used for human fertility treatment, but also that cryopreserved oocytes may be used successfully as an adjunct to human assisted reproductive technologies. Vitrification is known to establish a glass-like solid state during the cooling process. The high concentration ...
Endo Tsutomu - - 2008
Histone acetylation plays an important role in the regulation of chromatin structure and gene function. In mammalian oocytes, histones H3 and H4 are highly acetylated during the germinal vesicle (GV) stage, and global histone deacetylation takes place via a histone deacetylase (HDAC)-dependent mechanism after GV breakdown (GVBD). The presence of ...
Romanato M - - 2008
BACKGROUND: Previous results from our laboratory have led us to propose heparan sulfate (HS) as a putative protamine acceptor during human sperm decondensation in vivo. The aim of this paper was to investigate the presence of glycosaminoglycans in the mammalian oocyte in an effort to better support this contention. METHODS: ...
Manjunatha B M - - 2008
Ovum pick up (OPU) was conducted twice a week for 12 weeks in six cycling, non-descriptive (local breed), Indian buffaloes to study the efficiency of OPU on recovery of oocytes for embryo production. OPU was performed using an ultrasound equipment with a 5-MHz transvaginal transducer, a single-lumen, 18-gauge, 55-cm-long needle ...
Kumbak Banu - - 2009
OBJECTIVE: To investigate the early clinical pregnancy loss rate (ECPLR) of singleton gestations in poor responder (PR) patients. DESIGN: A retrospective study. SETTING: Private assisted reproductive technology center. PATIENT(S): A total of 2,157 singleton clinical pregnancies were identified, 195 from PR and 1,962 from normoresponder (NR) patients. Poor response was ...
Ogushi Sugako - - 2008
With fertilization, the paternal and maternal contributions to the zygote are not equal. The oocyte and spermatozoon are equipped with complementary arsenals of cellular structures and molecules necessary for the creation of a developmentally competent embryo. We show that the nucleolus is exclusively of maternal origin. The maternal nucleolus is ...
Naether O G J - - 2008
This paper reports the case of a patient undergoing IVF and polar body analysis for aneuploidy screening because of advanced maternal age. A total of nine fertilized oocytes were obtained from the patient's third treatment cycle. Three supernumerary pronuclear stage oocytes were identified as suitable after aneuploidy screening for five ...
Filali M - - 2008
In-vitro maturation of oocytes (IVM) is a new IVF technology developed in order to avoid iatrogenic complications of standard IVF treatments. This technique is particularly useful in patients suffering from polycystic ovary syndrome (PCOS) who are concerned with the risk of ovarian hyperstimulation syndrome. This technique is nowadays routinely practised ...
Montag M - - 2008
A retrospective study recently showed that oocytes presenting with a high birefringence of the inner zona layer were more often associated with conception cycles. To further investigate these findings, a prospective study was conducted between September 2005 and September 2006 including intracytoplasmic sperm injection (ICSI) cycles presenting with at least ...
Fan Zhi-Qiang - - 2008
This study was performed to investigate the effect of partial zona pellucida incision by piezo micromanipulation (ZIP) on the in vitro fertilizing ability of stored mouse spermatozoa. The storage conditions were optimized by storing the mouse epididymides at 4 C in mineral oil or in the mouse body for up ...
Kojima Rieko - - 2008
PURPOSE: For this study, the impact of basal FSH levels on ART outcomes was assessed. METHODS: From June 2003 to May 2006, 191 ART cycles were performed in our hospital. All cases were treated with GnRH-a long protocol. The patients were classified according to their basal FSH level as follows: ...
Nasr-Esfahani Mohammad H - - 2008
OBJECTIVE: To evaluate efficiency of ionomycin on fertilization and cleavage rates, embryo development, and pregnancy rate after intracytoplasmic sperm injection (ICSI) in teratozoospermic patients. DESIGN: Laboratory study. SETTING: Isfahan fertility and infertility Center, and Royan institute, Tehran, Iran. PATIENT(S): Eighty-seven couples with male factor etiology (severe teratozoospermia) undergoing ICSI. INTERVENTION(S): ...
Ebner Thomas - - 2008
Few cytoplasmic dysmorphisms of oocytes have been reported to negatively influence the further fate of the ova. One such anomaly, namely the central aggregation of the smooth endoplasmic reticulum (SER), has recently been associated with suboptimal outcome in a limited number of patients. In order to increase prognostic value, it ...
Burney R O - - 2008
PURPOSE: To report the case of a patient undergoing in vitro fertilization (IVF) in which a non-pronuclear (0PN) oocyte resulted in a normal pregnancy. METHODS: A 36-year-old woman underwent an IVF-embryo transfer treatment cycle. RESULTS: Four oocytes were retrieved for insemination by IVF. Examination for fertilization revealed two polypronuclearpolygynic and ...
Davenport Marsha L - - 2008
Turner syndrome (TS) is a relatively common disorder of phenotypic females caused by loss of all or part of the second sex chromosome. Most individuals with TS have short stature and gonadal dysgenesis and are at risk for many other medical and learning problems. In the 45,X ovary, germs cells ...
Mendez Lozano Daniel H - - 2008
The objective of this study was to assess the reproductive competence of oocytes obtained by follicular flushing in poor responder patients. This prospective comparative study, at the University of Paris XI, Assistance Publique des Hopitaux de Paris, INSERM Unit 782, was performed on 165 infertile IVF embryo transfer candidates. A ...
Reinblatt Shauna L - - 2008
In vitro fertilization (IVF) with ovarian stimulation is an effective treatment for couples needing treatment with assisted reproductive technologies (ART) where polycystic ovary syndrome (PCOS) is coexisting. However, it is also associated with an increased risk of ovarian hyperstimulation syndrome. In vitro maturation (IVM) avoids the risks and side effects ...
Schutte Joke M - - 2008
BACKGROUND: The percentage of women giving birth after the age of 35 increased in many western countries. The number of women remaining childless also increased, mostly due to aging oocytes. The method of oocyte donation offers the possibility for infertile older women to become pregnant. Gestation after oocyte-donation-IVF, however, is ...
Hannoun Antoine - - 2008
OBJECTIVE: The objective of this study is to assess the effect of two methods of vaginal scrubbing before egg retrieval on the outcome of in vitro fertilization-embryo transfer (IVF-ET) cycles. METHOD: 721 consecutive cycles of IVF-ET, at the American University Hospital of Beirut, were randomized prospectively into one of two ...
Check J H - - 2008
PURPOSE: The need for freezing oocytes has been established for females undergoing potential therapy that could damage their ovarian egg reserve, ethical or religious reasons (not having excess embryos frozen) or women nearing the age of lower fecundity but not married and not ready to use donor sperm. Applying the ...
1 2 3 4 5 6 7 8 9 10 >