This is one of a series of news items from abstracts of studies presented at the Annual Meeting of the American Society for Reproductive Medicine as complied by Dr. David Meldrum, Scientific Director of Reproductive Partners. We appreciate the enormous amount of work it takes to compile and comment on these abstracts.
There are many reasons that the use of the elective single embryo transfer (eSET) is being recommended more often when the clinical situation and embryo quality make it an appropriate choice. Primarily it's a strategy to reduce the chance of having even twins with it's inherent additional risks to a pregnancy. A presentation at the meeting brings up another reason to choose eSET.
Using CDC data, singleton births having a good outcome (as defined by term birth and weight more than 2500 grams) was better when only one fetal heart was detected in early ultrasounds. Women with a history of a prior birth also had a better outcome. This study shows an adverse effect from the so-called vanishing twin. The most likely factor for this observation is the effect on the absorbtion of the additional tissue.