During Assisted Reproductive Technology (ART) procedures, the transfer of a single embryo dramatically reduces the rate of multiple pregnancy. Proper information, therefore, should be delivered to patients before embryo transfer. In many countries, regulations limit, according to age of the patient, the number of embryos to be transferred. Selective fetal reduction should not be considered as a...

Embryo transfer (ET) to recipient females is a foundational strategy for a number of assisted reproductive technologies, including cloning by somatic cell nuclear transfer. In an attempt to develop efficient ET in domestic ferrets, factors affecting development of transferred embryo were investigated. Unilateral and bilateral transfer of zygotes or blastocysts in the oviduct or uterus was evalu...

Pregnancy loss is a serious social and medical issue, with one important cause associated with aberrant embryo implantation during early pregnancy. However, whether and how the process of embryo implantation is affected by environmental factors such as stress-induced sympathetic activation remained elusive. Here we report an unexpected, transient effect of β(2)-adrenoreceptor (β(2)-AR) activati...

We examined the influence of the procedures used in embryo transfer on pregnancy rates. Over a period of 15 months (Nov. 1996-Jan. 1998), 320 patients were recruited. They were randomized on an alternate basis either to a Wallace catheter or an Erlangen metal catheter. Randomization was also applied within the same groups for embryo transfer at 48 h and 72 h post-insemination. Fifty patients ra...

Background: The aim of this study was to determine the outcome of IVF/ ICSI by modification of embryo transfer technique following embryo transfer. Materials and Methods: In this randomized trial study, two groups of infertile women (n = 55) aged %40 years underwent in vitro fertilization or intracytoplasmic sperm injection treatment cycles with or without 0.2 mL of air pushed into the catheter...

BACKGROUND: Manipulation of the uterine epithelium utilising standard dose exogenous oestrogen (E2) and progesterone (P4) has been shown to achieve a mature secretory morphological response. However, in an in vitro fertilisation (IVF) setting, frozen embryo transfer (ET) has had a low success rate. We propose that in patients with previously failed ET attempts, the uterine epithelium can be dir...

The objective of this study was to determine the effects of age of mare and degree of asynchrony between donor and recipient on pregnancy rate (PR) to embryo transfer in recipient mares. Light-horse mares (n = 34) between 3 and 16 yr of age were used as recipients. Mares were subjected to an artificial photoperiod. Cyclic recipients were examined by palpation and ultrasound at regular intervals...