Studies question wisdom of trend toward managed childbirth
August 29, 2007
Her first baby wasn’t due for four days, but Misa Hayashi was advised by her obstetrician during a routine exam to check into the hospital that day.
“The doctor said the baby was too big for me to push out and we should go ahead and induce labor,” says the 24-year-old woman from Alhambra, Calif. “I didn’t really question it. Induction sounds so common. We went home and packed a bag and checked in at the hospital.” Once there, however, Hayashi’s plans for an uncomplicated birth faltered. After receiving the drug Pitocin to trigger contractions, she labored for 20 hours. The pain was so intense that she needed medication to ease it – something she had hoped to avoid – and eventually the baby became distressed, requiring constant monitoring of his heart rate.
Finally, almost a full day after Hayashi entered the hospital, her son was born. Although he was healthy at 7 pounds, 10 ounces, Hayashi was left questioning the wisdom of labor induction.
Some hospitals and health-care organizations across the United States share her concerns. Several have barred elective labor induction under certain circumstances, such as before 39 weeks of gestation (one week before the due date) or when there isn’t clear evidence that the mother’s cervix is primed for childbirth.
“There is renewed interest in these seemingly benign medical interventions,” says Dr. William Grobman, an assistant professor of maternal-fetal medicine at Northwestern University. “But the topic is somewhat hazy. We don’t have all the information we’d like to have about risks and benefits.”
The move appears to be a push back against the trend in recent decades to medically manage childbirth. Fewer than 10 percent of women underwent induction in 1990, but more than 21 percent did so in 2004, according to federal government statistics. No one knows how many of those inductions were prompted by legitimate medical concerns. But various studies have put the number of inductions for convenience at 15 percent to 55 percent of the total number.
Recommended Stories For You
At the same time, rates of Caesarean sections increased to more than 29 percent in 2004, up from 23 percent in 1990, with many women requesting elective C-sections – surgical births without any medical justification. That trend, too, has generated debate about whether patients are undertaking unnecessary risks.
Labor induction is frequently, and legitimately, recommended when health problems complicate a pregnancy or when pregnancies are more than two weeks past the due date, obstetricians and gynecologists say. But sometimes the procedure is done solely for convenience. In a busy society, doctors and patients have grown increasingly comfortable with this practice.
“People want to schedule their birth like they schedule their nail appointments,” says Janie Wilson, director of nursing operations for women and newborns at Intermountain Healthcare, a Salt Lake City-based chain of hospitals that has tried to reduce the rate of labor inductions.
Until recently, few have questioned whether elective labor induction is appropriate. “There is not a unique description of elective labor induction that every single provider can agree on,” Grobman says. Indeed, the practice appears to vary widely among patients, doctors and hospitals. According to national figures, for example, labor induction for either medical or nonmedical reasons occurs in 25 percent of white women but in 18 percent of black women and 14 percent of Hispanic women. A study published in 2003 in the journal Birth found that the percentage of inductions that were elective varied from 12 percent to 55 percent among hospitals and from 3 percent to 76 percent among individual doctors.
Some experts say the practice creates unnecessary risks and costs. It can lead to more interventions, such as Caesarean sections, and increased use of forceps and vacuum devices to assist in delivery, research has shown. A 2005 study in the journal Obstetrics & Gynecology found that C-sections occurred 12 percent of the time among women having spontaneous labor compared with 23.4 percent for women having medically necessary labor induction and 23.8 percent for women having elective labor induction.
Other studies have found that, compared with spontaneous labor, elective induction leads to longer hospital stays and higher costs. Induced labor also may be more painful, because some of the drugs administered to trigger labor can cause more intense contractions.
The risks of C-section or other complications appear highest when induction is performed before 39 weeks and in women who have not had a previous vaginal birth.
Some hospital administrators are saying, “Enough.” Intermountain Healthcare, which operates 21 hospitals in Utah and Idaho, implemented strict guidelines on elective labor induction eight years ago. Today, the company’s results are held up as a model for reining in birth practices that cannot be medically or financially justified.
The chain, which delivers 53 percent of all babies in Utah, told its doctors they must seek permission from a supervisor before inducing labor prior to 39 weeks. Doctors also must make sure the cervix is favorable for delivery.
When the cervix is optimal (it must be opened and thinned out enough to allow the baby’s head to pass through), labor averages about nine hours in a first-time pregnancy, according to Intermountain. If the cervix is not ready, however, an average labor is about 22 hours. The guidelines have reduced rates of elective labor inductions performed before 39 weeks’ gestation from 28 percent in 1999 to 3.4 percent in 2006. The percentage of first-time moms with an elective induction has fallen from 15 percent in 2003 to 4.7 percent .
The program has resulted in plunging C-section rates, fewer newborns in intensive care and fewer medical interventions in delivery. Length of labor has decreased by an average of two hours per patient. That’s important, Wilson says, because length of labor is linked to a higher risk of dehydration and infection.
“We feel pretty confident that it does make a difference,” she says.
There is little scientific evidence that labor induction causes any long-lasting harm to mother or baby. But even short-term medical problems are significant given the nation’s health-care economic crisis, Wilson says. According to Intermountain’s data, healthy deliveries in the 39th week (and women whose cervixes were fully prepared) incur the lowest costs.
“It could be contributing to the double-digit premium increases you pay each year,” she says of elective labor induction’s effect on insurance rates. “Cost is the icing on the cake. But it’s not the main reason we should be doing this. We should do it because it’s safer.”
But not everyone thinks elective labor induction is harmful. A study published July 31 in the Annals of Family Medicine suggested that “preventive labor induction” may produce the best safety outcomes, including lower C-section rates.
Doctors practicing in a rural Connecticut hospital found that the approach, which includes the use of a mild-acting prostaglandin gel to ripen the cervix before inducing labor, significantly lowered C-section rates compared with women receiving traditional care. Specific criteria were used to determine the “optimal time” for the patient to undergo the preventive induction.
The idea is to perform an induction before the baby gets too big and the placenta can no longer fully support a healthy pregnancy.
If women are carefully selected – based on an accurate due date, fetal maturity and other risk factors – induction may produce the best results, says the study’s author, Dr. James M. Nicholson, assistant professor at the University of Pennsylvania Department of Family Medicine and Community Health.
“Over the last two or three years, there is evidence that if you induce when the cervix is favorable, then induction doesn’t cause adverse outcomes like C-sections,” he says.
The method needs more proof, Nicholson says. He is conducting a randomized, controlled trial at the University of Pennsylvania.
“If this is true, it really could change thoughts on how to manage labor in a big way,” he says. “It would lead to all sorts of different research questions: How to induce, when to induce, is race a factor? The questions are numerous.”
Many researchers say elective labor induction – like elective C-sections – needs to be submitted to more rigorous research on safety outcomes.
Until then, however, interventions that are performed without an obvious medical need should be viewed skeptically, says Dr. Michael C. Klein, emeritus professor of family practice and pediatrics at the University of British Columbia, who wrote an editorial in the same journal calling the study’s conclusions into question.
“Childbirth is complex,” says Klein, who has studied birth outcomes. “What they are doing is complex, but they are not acknowledging it.” Klein says the lower C-section rates may be due to the especially attentive and intense care the laboring women in the study received – not because they were induced at an optimal time.
“This is another study saying to women, ‘You can’t survive without us making things better; nature is completely off-track,”‘ Klein says . “And there is a huge reservoir of practitioners out there who want to hear this message.”
Doctors who want the convenience to schedule daytime deliveries may be the biggest force for elective labor induction, says Lisa Sherwood, a certified nurse midwife and women’s health-care nurse-practitioner based in San Clemente, Calif . Women who “haven’t slept well in weeks, have swollen ankles and sore backs” are vulnerable to the suggestion of elective induction. “People look at the doctor as the expert and will do whatever he or she suggests.”
Women undergoing elective induction should discuss the potential risks and benefits with their doctors, Intermountain’s Wilson says.
“I’m not sure consumers think about the risks. They think, ‘Gosh, I want elective induction at 38 weeks because I’m tired of being pregnant,”‘ she says. “Hopefully, educating them up front and setting expectations will make it easier.”