Nav: Home

Prenatal steroids reduce risk of brain bleeding in preemies, Stanford study finds

March 24, 2016

Prenatal steroid treatment reduces by half a premature baby's risk for a severe form of brain hemorrhage after birth, a study from the Stanford University School of Medicine has found.

The research, on nearly 26,000 premature infants, demonstrated that the benefit applies even to the earliest born preemies, who can be overlooked as potential candidates for this steroid treatment.

The study will be published online March 24 in the Journal of Perinatology. The senior author is Henry Lee, MD, assistant professor of pediatrics. The lead author is Julia Wei, who was a graduate student at the University of California-Berkeley School of Public Health when the study was conducted.

The researchers evaluated steroid treatments that were originally developed to mature fetal lungs before premature birth. Studies from the 1990s and early 2000s suggested that these steroids also protect preemies' brains, but the Stanford team was unsure if the benefit held in the context of modern neonatal care. The team also wondered about extremely premature babies, a population that had not been enrolled in the original clinical trials evaluating the effects of steroids on lung maturation.

"When steroids first came out, they were being used only in babies born at 26 weeks of pregnancy or older," said Lee, who is also a neonatologist at Lucile Packard Children's Hospital Stanford and Stanford Children's Health. "But we've now been able to show that even in babies born as early as 22 to 24 weeks, steroid treatment has a very strong benefit for the brain. This may expand the group of babies we would recommend using steroids for."

Potentially fatal hemorrhages

Current recommendations from the National Institutes of Health suggest giving steroids to mothers likely to deliver between 24 and 34 weeks of pregnancy, Lee noted.

The study evaluated intraventricular hemorrhage, in which bleeding occurs in the spaces around the brain where cerebrospinal fluid normally circulates. Intraventricular hemorrhages can increase the risk of death, and babies who survive them may develop neurologic problems such as hydrocephalus, cerebral palsy and mental retardation.

The researchers analyzed data on 25,979 infants born between 2007 and 2013. The data were drawn from the California Perinatal Quality Care Collaborative, which collects information about nearly all California births for preterm neonates. Infants were included in the study if they arrived between 22 and 32 weeks of pregnancy and weighed less than 3.3 pounds at birth. A normal pregnancy lasts 40 weeks.

Among the infants studied, 87 percent were born to mothers who received steroids in anticipation of a premature delivery. The risk of all types of intraventricular hemorrhage was one-third lower in babies of mothers who received prenatal steroids than in those whose mothers didn't receive prenatal steroids. For the most severe forms of IVH, the risk was cut in half. The drop in risk was statistically significant for babies born between 22 and 29 weeks of pregnancy, but not for those born at 30 weeks or later, the study said.

"We speculate that steroids may accelerate the maturation of blood vessels in the brain and make them stronger," Lee said. "That may make the baby less vulnerable to rapid shifts in blood pressure, which could otherwise cause bleeding similar to a stroke."

Condition now less common in preemies

The rate of intraventricular hemorrhage in premature babies has declined since the 1980s, Lee noted. "That change is probably not due to only one thing, but more to our overall awareness of how to take better care of the baby before and after birth," he said. For example, in addition to using prenatal steroids more often, doctors and nurses also keep premature babies' heads in a stable position during the first few days of life, and attempt to avoid dramatic shifts in preemies' blood pressure.

"It's helpful to know that prenatal steroids are an impactful component to our strategy to prevent these potentially devastating hemorrhages," Lee said. He thinks the new finding will be welcome news not just for other physicians but also for the parents of preemies.

"When I talk with these parents, I'm often describing risks and potential complications for their baby," he said. "It helps to be able to talk not just about risks but also about proven therapies -- to say, 'Here is a therapy that we have found to be very beneficial.'"
-end-
Other Stanford co-authors of the paper are Jochen Profit, MD, assistant professor of pediatrics, and Jeffrey Gould, MD, professor of pediatrics. Lee, Profit and Gould are members of Stanford's Child Health Research Institute. Researchers at the UC-Berkeley School of Public Health also contributed to the paper.

The research was funded by the Eunice Kennedy Shriver National Institute of Child Health & Human Development (grants K23HD068400 and HD083368.)

Stanford's Department of Pediatrics also supported the work.

The Stanford University School of Medicine consistently ranks among the nation's top medical schools, integrating research, medical education, patient care and community service. For more news about the school, please visit http://med.stanford.edu/school.html. The medical school is part of Stanford Medicine, which includes Stanford Health Care and Lucile Packard Children's Hospital Stanford. For information about all three, please visit http://med.stanford.edu.

Stanford University Medical Center

Related Pregnancy Articles:

Medication use during pregnancy is common in women with preeclampsia
Use of medications during pregnancy is more common in women with preeclampsia than in those without, according to a British Journal of Clinical Pharmacology analysis of women who gave birth at a hospital in Finland in 2002-2016.
Going to sleep on your back in late pregnancy
This study looked at whether going to sleep on your back in the third trimester of pregnancy was associated with average lower birth weights.
Opioid use disorder in pregnancy: 5 things to know
Opioid use is increasing in pregnancy as well as the general population.
Medical imaging rates during pregnancy
Researchers looked at rates of medical imaging (CT, MRI, conventional x-rays, angiography, fluoroscopy and nuclear medicine) during pregnancy in this observational study that included nearly 3.5 million pregnant women in the United States and Canada from 1996 to 2016.
New research on diet and supplements during pregnancy and beyond
The foods and nutrients a woman consumes while pregnant have important health implications for her and her baby.
Obesity in early pregnancy linked to pregnancy complications
In a prospective study published in Obesity of 18,481 pregnant women in China who had never given birth before, obesity in early pregnancy was linked to higher risks of spontaneous abortion, preterm birth, and large birth weight in newborns.
Possible link between autism and antidepressants use during pregnancy
An international team led by Duke-NUS Medical School has found a potential link between autistic-like behaviour in adult mice and exposure to a common antidepressant in the womb.
Immigrant women more likely to be overweight during pregnancy
A new study in the Journal of Public Health finds that women in Norway from immigrant backgrounds are more likely to be overweight during pregnancy.
Stillbirths more likely if diabetes in pregnancy not diagnosed
Women who develop diabetes in pregnancy but are not diagnosed are much more likely to experience stillbirth than women without the condition, according to new research.
Do economic conditions affect pregnancy outcomes?
Economic downturn during early pregnancy was linked with modest increases in preterm birth in a Paediatric and Perinatal Epidemiology analysis.
More Pregnancy News and Pregnancy Current Events

Top Science Podcasts

We have hand picked the top science podcasts of 2019.
Now Playing: TED Radio Hour

In & Out Of Love
We think of love as a mysterious, unknowable force. Something that happens to us. But what if we could control it? This hour, TED speakers on whether we can decide to fall in — and out of — love. Guests include writer Mandy Len Catron, biological anthropologist Helen Fisher, musician Dessa, One Love CEO Katie Hood, and psychologist Guy Winch.
Now Playing: Science for the People

#542 Climate Doomsday
Have you heard? Climate change. We did it. And it's bad. It's going to be worse. We are already suffering the effects of it in many ways. How should we TALK about the dangers we are facing, though? Should we get people good and scared? Or give them hope? Or both? Host Bethany Brookshire talks with David Wallace-Wells and Sheril Kirschenbaum to find out. This episode is hosted by Bethany Brookshire, science writer from Science News. Related links: Why Climate Disasters Might Not Boost Public Engagement on Climate Change on The New York Times by Andrew Revkin The other kind...
Now Playing: Radiolab

An Announcement from Radiolab