Friday, March 14th, 2014
Intrauterine devices (IUDs), which are long-term birth control devices that are implanted in a woman’s uterus, have been found to be effective for a longer time than the devices’ makers expected or intended, according to a new review of past studies published in the journal Contraception. More from Reuters:
The older women are when certain IUDs are inserted, the longer they can leave them in, the review found.
IUDs, small plastic or metal devices inserted into the uterus, prevent pregnancy either by killing or damaging sperm or by releasing hormones that thicken the cervical mucus which does not allow sperm to pass. They are the most effective type of reversible birth control, with lower failure rates than the Pill, implants, patches or condoms.
Although recommendations on IUD use have stayed the same for some time, the finding that the devices are effective for longer than advertised is actually old news, Dr. Justine P. Wu told Reuters Health.
She worked on the study at the Rutgers Robert Wood Johnson Medical School in New Brunswick, New Jersey.
“We have had these data in our hands for years,” Wu said. “Our hope is that this review will bolster clinician and patient confidence, both in the United States and worldwide, in the safety and benefits of extending use of certain IUDs beyond the manufacturer-approved time period, among select women.” That includes women who have had one or more children and were at least 25 years old when the IUD was inserted.
Among those women, copper IUDs seem to be effective birth control for at least nine years, depending on the brand. ParaGard, a copper IUD recommended for up to 10 years, is effective for at least 12.
Mirena, a plastic IUD which releases the hormone levonorgestrel to prevent pregnancy, is advertised as effective for five years, but is effective for at least seven years, according to the review published in the journal Contraception.
For women who were at least 35 when the IUD was placed, studies indicate ParaGard remains effective until menopause.
There were not enough studies of women under age 25 to determine how long Mirena and ParaGard are effective beyond recommendations in that group, the researchers said.
Extended use of an IUD among women over 25 who have had a child ultimately reduces costs, improves convenience and extends birth control benefits, Wu said.
Image: IUD, via Shutterstock
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Friday, January 3rd, 2014
A new study has found that women who use long-term birth control methods like intrauterine devices (IUDs) after having a baby are less likely to become pregnant again quickly than women who rely on other methods of birth control. More from Reuters:
The World Health Organization endorses a two-year period between birth and a woman’s next conception.
Still, one third of all repeat pregnancies in the U.S. occur within 18 months of the previous child’s birth. And a growing body of evidence shows this close timing increases the risk a baby will be born early or at a low birth weight.
The time between pregnancies “cannot be explained only by the mother’s preferences,” Heike Thiel de Bocanegra said.
She and her colleagues from the University of California, San Francisco investigated the link between access to birth control or family planning services and pregnancy spacing.
In the current study of 117,644 California women who’d had at least two children, 64 percent waited 18 months or more between pregnancies and the rest did not.
All women included in the study filed claims through the state’s Medicaid program for the poor, called Medi-Cal, or through health providers offering state-funded family planning services.
The researchers matched data on claims for contraceptives to California’s birth registry.
“We assumed that access to contraception . . . would improve birth spacing,” Dr. Anitra Beasley wrote in an email to Reuters Health.
“This study actually examines this assumption,” she said.
Beasley, who studies family planning at Baylor College of Medicine in Houston, was not part of the current research.
Women who used long-acting reversible contraception, including IUDs or implants, were four times more likely to wait at least 18 months to conceive again, compared to those who only used “barrier” contraceptives like condoms or spermicide.
More than half of women started using birth control pills, the ring or the patch after giving birth. They were twice as likely to wait at least 18 months between pregnancies as condom users.
Those relationships stood firm even when the researchers looked at possible influences like the mother’s race, education, age and whether she was born in the U.S., according to the report published in the American Journal of Obstetrics and Gynecology.
Image: Birth control words, via Shutterstock
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Friday, January 11th, 2013
The Food and Drug Administration has approved a new intrauterine device (IUD), the first such new approval in 12 years, Reuters is reporting:
The T-shaped polyethylene device is designed to prevent pregnancy for 3 years, during which time it releases a diminishing dosage of progestin, according to Bayer documents.
The proportion of women using long-acting reversible contraceptive methods such as an intrauterine device (IUD) climbed to 7.7 percent in 2009 up from 2.0 percent in 2002, according a 2012 study by the Guttmacher Institute, a reproductive health and rights organization based in New York.
The highest level of use was among women aged 25-39 and those who already had at least one child.
The IUD, called Skyla, is aimed at younger women who have not had children. During a trial of 1,432 women aged 18 to 35 years, the rate of pregnancy over a three-year period was 0.9 per 100 women, and 77 percent of women wishing to become pregnant did so within 12 months of its removal, Bayer documents said.
“Over half of all pregnancies in the U.S. are unintended and there’s just a need out there to have effective birth control,” said Pamela Cyrus, Bayer’s head of medical affairs said in an interview.
Image: Woman talking to her doctor, via Shutterstock
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