Early Cesarean deliveries pose risk for babies, study finds
Elective C-sections performed before 39 weeks of pregnancy increase the chance of serious complications, according to an analysis of more than 13,000 births.
Thousands of women put their babies at needless risk of respiratory problems, hypoglycemia and other medical ailments by scheduling Cesarean deliveries too early, according to an analysis of more than 13,000 births published today in the New England Journal of Medicine.
Elective Cesarean sections performed after 37 or 38 weeks of pregnancy had up to four times the risk of serious complications compared to procedures done after 39 weeks. Even deliveries that were just one, two or three days shy of 39 weeks carried a 21% increased risk of complications, the study found.
"It looks like a day or two makes a difference," said Dr. John Thorp, a professor of obstetrics and gynecology at the University of North Carolina at Chapel Hill and coauthor of the study.
The initiation of labor is a baby's way of signaling that it is ready to live outside the womb, Thorp said. When doctors schedule elective C-sections, "we're saying we're smarter than that signal," he said. "There are some babies who aren't ready to make that transition and are forced to do so."
Altogether, there were 1,262 cases involving some kind of complication among the 13,258 elective C-sections examined in the study. The incidence of adverse outcomes was 15.3% after 37 weeks, 11% after 38 weeks and 8% after 39 weeks.
The American College of Obstetrics and Gynecology has recommended since at least 1999 that patients wait 39 weeks or longer before having an elective C-section, said Dr. Mary D'Alton, chair of the Department of Obstetrics and Gynecology at New York-Presbyterian Hospital/Columbia University Medical Center. D'Alton, who wasn't involved with the study, led an expert panel for the National Institutes of Health in 2006 that also emphasized in a report the importance of scheduling voluntary C-sections after 39 weeks of pregnancy.
Yet more than one-third of the women in the study published today delivered earlier than that -- 6% after 37 weeks and 30% after 38 weeks.
Those mothers were more likely to be Caucasian, married and privately insured, the study found -- part of a cohort of professional women sometimes described as "too posh to push." They probably scheduled their deliveries on the early side to avoid any risk of going into labor at a time when their doctors might not be available to care for them, Dr. Michael F. Greene, the chief of obstetrics at Massachusetts General Hospital in Boston, wrote in an editorial accompanying the study.
