More than one in three twin births and three of four births of triplets or more in the United States are the result of fertility treatments, new estimates show.
While in-vitro fertilization (IVF) practices have improved to produce fewer triplets or higher-order births than at peak, multiple births from other types of fertility treatments have not slowed.
The proportion of triplets or more related to medical assistance has actually dropped from a peak of 84 percent in 1998 after in vitro fertilization (IVF) guidelines discouraging implantation of three or more embryos took effect that year, a new study reports.
IVF has also improved enough that single embryo transfers now often succeed in producing healthy pregnancies. But in the meantime, non-IVF fertility treatments such as ovarian stimulation and ovulation induction—for instance, with the drug clomiphene citrate—have increased to become the predominant source of medically assisted multiple births in the country, while IVF is increasingly producing twins.
Some mothers and couples may hope for twins through fertility treatments, but more often multiple births are not desired. In those cases, new parents and children incur unwarranted medical risk and long-term financial costs that doctors should strive to prevent, says Eli Y. Adashi, professor of obstetrics and gynecology at Brown University.
“We do have a real problem with way too many multiple births in the United States with consequences to both mothers and babies. It’s an unintended consequence of otherwise well intentioned and remarkable technology.”
Multiple births multiply
To arrive at their estimates, researchers gathered data on multiple births from 1962 to 1966 (before any medical fertility treatments were available) and from 1971 through 2011. Data on IVF procedures has been available since 1997, but no data is available that directly reflects the contribution of non-IVF procedures to rates of multiple births.
The team therefore estimated the role of non-IVF technologies by subtracting the multiple births arising from IVF from the overall number of multiple births, while also accounting for the impact of maternal age on birth plurality. The data from the 1960s, meanwhile, provided a statistical baseline for natural multiple birth rates without medical intervention that the team also used in their estimates.
The contribution of fertility treatments over the last 40 years is unmistakable: Between 1971 and 2011, the percent of US births that were multiples doubled to 3.5 percent from 1.8 percent. Even after adjusting for maternal age, the rate of twin births rose 1.6 times between 1971 and 2009.
And while triplets or more due to IVF have dropped to 32 percent of cases from 48 percent between 1998 and 2011, the percent of triplets or more due to non-IVF procedures rose to 45 percent of cases from 36 percent during that same time.
Hard to control
“IVF is moving, in a sense, in the right direction and cleaning up its act, whereas the non-IVF technologies are at a minimum holding their own and possibly getting worse,” Adashi says.
“From a policy point of view what that means is that (we) need to focus on the non-IVF technologies, which really hasn’t been done in a concerted way because they weren’t considered all that relevant to this mix.”
Ultimately, it may be harder to curb multiple births from non-IVF treatments than from IVF. While multiple births from IVF are a direct result of the number of embryos that are fertilized and intentionally implanted, non-IVF therapies involve medications that stimulate ovulation and follicle growth in ways that cannot be precisely predicted or controlled.
The new estimates will at least focus more attention on the major contribution non-IVF treatments make on multiple births, the authors write in the paper published in the New England Journal of Medicine.
That may spur improved data gathering, such as creation of a registry of non-IVF treatments and outcomes, and ultimately more careful practice regimens.
“Increased awareness of multiple births resulting from non-IVF fertility treatments may lead to improved medical practice patterns and a decrease in the rate of multiple births” the paper concludes.
Researchers from Johns Hopkins University, the US Center for Disease Control and Prevention, and the Cincinnati Children’s Hospital Medical Center contributed to the study.
Source: Brown University