This study was designed to investigate the effect of vitrification and post-thaw survival and chromosomal aberrations caused by vitrification of vitrified 8-cell mouse embryos in comparison with a control group. To this purpose the survival rate and the frequency of chromosomal aberrations were assessed in frozen-thawed 8-cell mouse embryos after various storage durations in the presence of eth...

Background The aim of this study was to compare prenatal outcome of intra cytoplasmic sperm injection (ICSI) pregnancies with pregnancies obtained through in vitro fertilization (IVF). MaterialsAndMethods Retrospectively 532 pregnancies of ART cycles were assessed during 1999-2000. The main outcome measured including abortions, ectopic pregnancies, prematurity, low birth weight, cesarean sectio...

OBJECTIVE To assess the impact of prior unilateral or bilateral endometrioma cystectomy on controlled ovarian hyperstimulation (COH) and intracytoplasmic sperm injection (ICSI) outcome. DESIGN Retrospective case-control study. SETTING Department of Obstetrics and Gynecology, School of Medicine, Hacettepe University, Ankara, Turkey. PATIENT(S) Fifty-seven consecutive infertile patients wer...

OBJECTIVE To evaluate how the ranking of IVF programs changes if high-order multiple pregnancies (HOMPs) are considered negative outcomes. DESIGN Retrospective analysis. SETTING The 2004 Society for Assisted Reproductive Technology Clinic Outcome Reporting System. PATIENT(S) Two hundred seven programs that performed >50 IVF cycles were analyzed, and only patients <or=35 years of age were ...

BACKGROUND Multiple births are associated with serious adverse infant and maternal outcomes. The objective of this study was to assess the multiple-birth risk (MBR) associated with IVF and determine whether the risk is impacted by stage of embryo development at transfer. METHODS A population-based sample of 50 819 IVF transfers utilizing day 3 or day 5 embryos performed in the USA in 2001 on ...

To optimize success rates of IVF, selection of the most viable embryo(s) for transfer has always been essential, as embryos that are cryopreserved are thought to have a reduced chance of implanting after thawing. Recent developments challenge this concept. Evidence is accumulating that all embryos can now be cryopreserved and transferred in subsequent cycles without impairing pregnancy rates or...

nowadays gamete and embryo freezing is an appropriate approach for preserving of genetic traits in laboratory animals, rare and endangered species. frozen cells are suitable replace for actively breeding animals colony. the aim of this study was to perserve laboratory mouse embryo, using vitrification method and comparing effect of two cryoprotectants, glycerol-sucrose(gs) and ethylene glycol-f...

Background: For several years, mammalian cloning by splitting an early embryo or nuclear transfer into oocytes method has been successfully performed. Cloning is now also possible using adult somatic cells. Although it has now been 15 years since the first cloned mammals were generated from somatic cells using nuclear transfer (NT), the success rate for producing live offspring by cloning is lo...