Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Research shows smoking adds a decade to reproductive age of IVF patients

07.04.2005


A major new Dutch study has found that smoking adds the equivalent of ten years to a 20-year-old subfertile woman’s reproductive age and has a "devastating" impact on a couples’ chances of having a live birth after IVF. Being overweight also seriously damages their chances.

The harmful effects of smoking or being overweight were strongest among those women who had no obvious cause for not conceiving, according to the research, published today (Thursday 7 April) in Europe’s leading reproductive medicine journal Human Reproduction[1].

Lead researcher Dr Bea Lintsen, from Radboud University Nijmegen Medical Centre, said: "The positive news from our results, however, is that they suggest that couples – in particular, women with unexplained subfertility – may be able to improve the success of IVF treatment by quitting smoking and losing weight."



The research was a collaboration by doctors from twelve centres in the Netherlands who drew on data from a proportion of patients involved in the nation-wide OMEGA study, which was begun in 1995 to examine late effects of hormone stimulation. The team investigated the success rate of the first cycle of treatment in 8,457 women, analysing information on reproduction and lifestyle factors, combined with medical records of IVF treatment from 1983 to 1995. ICSI cycles were not evaluated as the treatment was not common during that period.

They divided the cause of subfertility into four categories – fallopian tube problems, male subfertility, unexplained fertility, and other causes (mainly women with polycystic ovarian syndrome or endometriosis) – and analysed first cycle treatment results for the first three causes. Of the total, 1,828 of the first IVF treatment cycles were for unexplained subfertility.

The overall live birth rate per cycle was 15.2%[2]. It was highest at 17.8% in couples with unexplained subfertility. Women with tubal problems had a 14.6% rate and the lowest success rate was for those with male subfertility (13.6%).

More than 40% of the women were smokers at the time of undergoing their first attempt at IVF and more than 7% were overweight i.e. had a body mass of 27kg/m2 or more.

Older women had lower success rates no matter what was the cause of subfertility, with the live birth rate decreasing by 2% for each additional year of age. "In all subgroups smokers had a lower delivery rate per treatment cycle than non-smokers," Dr Lintsen said. "The live birth rate for smokers was 28% lower than that of non-smokers. This was most marked in women who had no known cause for subfertility where the live birth rate among smokers was only 13% compared to 20% for non-smokers."

The miscarriage rate per pregnancy was also significantly higher for women who smoked, with around 21% losing their babies compared with around 16% of non-smokers.

Overweight women also fared badly with a 33% lower chance of a live birth from their first treatment cycle. As with smoking, the unfavourable effect of overweight was largest in women with unexplained subfertility. Only 14% had a live baby compared with over 18% for normal weight and nearly 21% for slightly overweight women.

Professor Didi Braat, one of the co-authors, said: "What our research clearly shows is that both smoking and being overweight unfavourably affect the live birth rate after IVF. Smoking has a devastating impact. It is comparable to adding a decade to the reproductive age of a 20-year-old. This means it makes her the equivalent of a 30-year-old non-smoker in reproductive terms.

"However, it also indicates that subfertile couples may help their chances of successful treatment by life-style changes. As the effects of smoking and overweight were greatest among women with unexplained subfertility, these results suggest that this group in particular may be able to improve the outcome of subfertility treatment by quitting smoking and losing weight."

[1] Effects of subfertility cause, smoking and body weight on the success rate of IVF. Human Reproduction. Doi:10.1093/humrep/deh898

[2] The authors point out that the success rates from this data might differ from success rates today, as success rates have increased since 1995 when the OMEGA study began.

Emma Mason | EurekAlert!
Further information:
http://www.eshre.com

More articles from Studies and Analyses:

nachricht Multi-year study finds 'hotspots' of ammonia over world's major agricultural areas
17.03.2017 | University of Maryland

nachricht Diabetes Drug May Improve Bone Fat-induced Defects of Fracture Healing
17.03.2017 | Deutsches Institut für Ernährungsforschung Potsdam-Rehbrücke

All articles from Studies and Analyses >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A Challenging European Research Project to Develop New Tiny Microscopes

The Institute of Semiconductor Technology and the Institute of Physical and Theoretical Chemistry, both members of the Laboratory for Emerging Nanometrology (LENA), at Technische Universität Braunschweig are partners in a new European research project entitled ChipScope, which aims to develop a completely new and extremely small optical microscope capable of observing the interior of living cells in real time. A consortium of 7 partners from 5 countries will tackle this issue with very ambitious objectives during a four-year research program.

To demonstrate the usefulness of this new scientific tool, at the end of the project the developed chip-sized microscope will be used to observe in real-time...

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Transport of molecular motors into cilia

28.03.2017 | Life Sciences

A novel hybrid UAV that may change the way people operate drones

28.03.2017 | Information Technology

NASA spacecraft investigate clues in radiation belts

28.03.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>