Featured Research

from universities, journals, and other organizations

Reassuring Evidence On The Outcome Of Children Born After Embryo Freezing

Date:
May 21, 2009
Source:
European Society for Human Reproduction and Embryology
Summary:
A new study provides reassuring evidence on the outcome of children born after embryos were frozen and stored, before being thawed and transferred to the womb. The results are good news as an increasing number of children, estimated to be 25% of assisted reproductive technology babies worldwide, are now born after freezing or vitrification (a process similar to freezing that prevents the formation of ice crystals).

A new study, published online in Human Reproduction, provides reassuring evidence on the outcome of children born after embryos were frozen and stored, before being thawed and transferred to the womb [2]. The results are good news as an increasing number of children, estimated to be 25% of assisted reproductive technology (ART) babies worldwide, are now born after freezing or vitrification (a process similar to freezing that prevents the formation of ice crystals).

The study, led by Dr Ulla-Britt Wennerholm, an obstetrician at the Institute for Clinical Sciences, Sahlgrenska Academy (Goteborg, Sweden), reviewed the evidence from 21 controlled studies that reported on prenatal or child outcomes after freezing or vitrification.

She found that embryos that had been frozen shortly after they started to divide (early stage cleavage embryos) had a better, or at least as good, obstetric outcome (measured as preterm birth and low birth weight) as children born from fresh cycles of IVF (in vitro fertilisation) or ICSI (intracytoplasmic sperm injection). There were comparable malformation rates between the fresh and frozen cycles. There were limited data available for freezing of blastocysts (embryos that have developed for about five days) and for vitrification of early cleavage stage embryos, blastocysts and eggs.

"Slow freezing of embryos has been used for 25 years and data concerning infant outcome seem reassuring with even higher birthweights and lower rates of preterm and low birthweights than children born after fresh IVF/ICSI. For the newly introduced technique of vitrification of blastocysts and oocytes, very limited data have been reported on obstetric and neonatal outcomes. This emphasises the urgent need for properly controlled follow-up studies of neonatal outcomes and a careful assessment of evidence currently available before these techniques are added to daily routines. In addition, long-term follow-up studies are needed for all cryopreservation techniques," concluded Dr Wennerholm.


Story Source:

The above story is based on materials provided by European Society for Human Reproduction and Embryology. Note: Materials may be edited for content and length.


Journal Reference:

  1. U.-B. Wennerholm, V. S๖derstr๖m-Anttila, C. Bergh, K. Aittomไki, J. Hazekamp, K.-G. Nygren, A. Selbing, and A. Loft. Children born after cryopreservation of embryos or oocytes: a systematic review of outcome data. Human Reproduction, 2009; DOI: 10.1093/humrep/dep125

Cite This Page:

European Society for Human Reproduction and Embryology. "Reassuring Evidence On The Outcome Of Children Born After Embryo Freezing." ScienceDaily. ScienceDaily, 21 May 2009. <www.sciencedaily.com/releases/2009/05/090520153849.htm>.
European Society for Human Reproduction and Embryology. (2009, May 21). Reassuring Evidence On The Outcome Of Children Born After Embryo Freezing. ScienceDaily. Retrieved April 16, 2014 from www.sciencedaily.com/releases/2009/05/090520153849.htm
European Society for Human Reproduction and Embryology. "Reassuring Evidence On The Outcome Of Children Born After Embryo Freezing." ScienceDaily. www.sciencedaily.com/releases/2009/05/090520153849.htm (accessed April 16, 2014).

Share This



More Health & Medicine News

Wednesday, April 16, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Ebola Outbreak Now Linked To 121 Deaths

Ebola Outbreak Now Linked To 121 Deaths

Newsy (Apr. 15, 2014) — The ebola virus outbreak in West Africa is now linked to 121 deaths. Health officials fear the virus will continue to spread in urban areas. Video provided by Newsy
Powered by NewsLook.com
Cognitive Function: Is It All Downhill From Age 24?

Cognitive Function: Is It All Downhill From Age 24?

Newsy (Apr. 15, 2014) — A new study out of Canada says cognitive motor performance begins deteriorating around age 24. Video provided by Newsy
Powered by NewsLook.com
How Mt. Everest Helped Scientists Research Diabetes

How Mt. Everest Helped Scientists Research Diabetes

Newsy (Apr. 15, 2014) — British researchers were able to use Mount Everest's low altitudes to study insulin resistance. They hope to find ways to treat diabetes. Video provided by Newsy
Powered by NewsLook.com
Carpenter's Injury Leads To Hundreds Of 3-D-Printed Hands

Carpenter's Injury Leads To Hundreds Of 3-D-Printed Hands

Newsy (Apr. 14, 2014) — Richard van As lost all fingers on his right hand in a woodworking accident. Now, he's used the incident to create a prosthetic to help hundreds. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins