Navigation Links
In Vitro Fertilization Success Rate Higher in Spring, Study Suggests
Date:9/14/2010

By Serena Gordon
HealthDay Reporter

TUESDAY, Sept. 14 (HealthDay News) -- New research suggests that success rates are higher when in vitro fertilization is done during the springtime.

A Brazilian study found that fertilization rates were highest in the spring -- 73.5 percent vs. 67.9 percent for winter. Spring fertilization rates also were higher than the summer and fall rates.

"Epidemiolgists have demonstrated a seasonal distribution in human natural conception and birth rates," said study author Daniela Braga, head researcher at the Assisted Fertilization Center in Sao Paulo. "We observed a 1.45-fold increase in the fertilization rate during the spring."

Braga said that the difference in fertilization rates may have something to do with the effect that changing light patterns can have on neurons in the brain that produce hormones that stimulate the release of eggs from the ovaries.

The study followed 1,932 women who were undergoing egg retrieval for in vitro fertilization. Four hundred and thirty-five women had egg retrieval in the winter, 444 had the procedure in the spring, 469 had egg retrieval done in the summer and 584 had it done in the fall.

Blood samples were also taken to compare estradiol levels -- a hormone that helps signal the ovaries to release eggs.

The number of eggs retrieved, high-quality embryos created, embryos implanted and pregnancy rates didn't differ significantly between the groups, according to the study.

What did change with the seasons were the fertilization rates, the study found. In the winter, 67.9 percent of eggs were fertilized. In the spring, that number was 73.5 percent; in the summer it was 68.7 percent and in the fall it was 69 percent.

Blood levels of estradiol didn't vary with the seasons. However, the concentrated estradiol levels per number of eggs retrieved was much higher in the spring than in other seasons, according to the study.

Braga was to present the findings Tuesday during the 20th World Congress on Fertility and Sterility in Munich, Germany.

Not everyone is convinced that seasonal differences are present for IVF, said Dr. David Keefe, chairman of obstetrics and gynecology at the NYU Langone Medical Center in New York City. He even suggested that women might be risking their fertility even further if they try to wait for what might be perceived as a more fertile time of the year.

"First, when we do in vitro, we're already overriding the whole system and the hormones that turn on reproduction. And, second, species that have a longer gestation, such as humans, have typically bred when the days are getting shorter, and they [the study authors] found the opposite here," explained Keefe.

"In addition, humans aren't as controlled or hardwired to environmental changes any more. We live in artificial lights, and control the temperature and humidity, so many cues that would trigger breeding, we control all the time. We've insulated ourselves against environmental changes," he said.

Plus, Keefe noted, the Brazilian researchers only studied one year, and it's possible that for other years, fertilization rates may be different by the season.

But, what's most important for people considering IVF is that there were no differences between seasons in the pregnancy rates, and that's what really matters to someone who's trying to have a baby.

Even Braga doesn't recommend waiting for the perfect season. "Despite the better results obtained in spring, it is important to highlight that assisted reproduction techniques are effective regardless of the season in which the treatment is being performed," she said.

More information

Learn more about in vitro fertilization from the U.S. National Library of Medicine.

SOURCES: Daniela Braga, M.S., head, research, Assisted Fertilization Center, Sao Paulo, Brazil; David Keefe, M.D., Stanley Kaplan chair, department of obstetrics and gynecology, NYU Langone Medical Center, New York City; Sept. 14, 2010, presentation, 20th World Congress of Fertility and Sterility, Munich, Germany


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Exposure to nitrogen dioxide lowers in vitro fertilization success
2. A novel in vitro model for light-induced wound healing
3. First clinical trials successfully completed on potent new hepatitis C drug
4. Stopping smoking cessation treatments too soon may reduce odds of success for 45 percent of smokers
5. Personalized medicine: Molecular imaging predicts treatment success in many cancers
6. Success stops drug trial
7. Fat distribution plays a role in weight loss success in patients at risk of diabetes
8. University of Colorado Denver Business School study shows failure better teacher than success
9. Putting focus on immediate health effects may improve weight loss success
10. Study finds proximity could be key to success of healing prayer
11. UM School of Medicine finds mentorship program successfully fights childhood obesity
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
 In Vitro Fertilization Success Rate Higher in Spring, Study Suggests
(Date:6/25/2016)... Miami, FL (PRWEB) , ... June 25, 2016 , ... The temporary closing of Bruton ... Plant City Observer , brings up a new, often overlooked aspect of head lice: ... The closing for fumigation is not a common occurrence, but a necessary one in the ...
(Date:6/25/2016)... ... June 25, 2016 , ... On Friday, June 10, Van Mitchell, Secretary ... Work award to iHire in recognition of their exemplary accomplishments in worksite health promotion. ... Maryland Workplace Health & Wellness Symposium at the BWI Marriott in Linthicum Heights. iHire ...
(Date:6/24/2016)... ... ... was in a crisis. Her son James, eight, was out of control. Prone to extreme ... “When something upset him, he couldn’t control his emotions,” remembers Marcy. “If there was ... other children and say he was going to kill them. If we were driving ...
(Date:6/24/2016)... Rhinebeck, NY (PRWEB) , ... June 24, 2016 , ... Topical BioMedics, Inc, makers of ... of companies that call for a minimum wage raise to $12 an hour by 2020 ... wage. This will restore the lost value of the minimum wage, assure the wage floor ...
(Date:6/24/2016)... ... June 24, 2016 , ... Strategic ... Frederick area economy by obtaining investment capital for emerging technology companies. SCP ... that have already resulted in more than a million dollars of capital investment ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... -- Research and Markets has announced the ... (Organic Chemical (Sugar, Petrochemical, Glycerin), Inorganic Chemical), Functionality (Filler, ... Global Forecast to 2021" report to their offering. ... pharmaceutical excipients market is projected to reach USD 8.1 ... the forecast period 2016 to 2021. ...
(Date:6/23/2016)... June 23, 2016 Capricor ... ), a biotechnology company focused on the discovery, ... that patient enrollment in its ongoing randomized HOPE-Duchenne ... exceeded 50% of its 24-patient target. Capricor expects ... third quarter of 2016, and to report top ...
(Date:6/23/2016)... INDIANAPOLIS , June 23, 2016 If ... Leaders Scholarship is any indication, the future is in ... at www.diabetesscholars.org by the Diabetes Scholars Foundation ... the way of academic and community service excellence. ... since 2012, and continues to advocate for people with ...
Breaking Medicine Technology: