Obesity may be driving C-section rates higher: study

Thu Aug 12, 2010 7:42pm EDT
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NEW YORK (Reuters Life!) - The larger a pregnant woman is when she checks in on delivery day, the greater her risk of having a cesarean section, according to a U.S. study.

Nearly one of every three births in the United States is now delivered by cesarean, a surgery that has been linked to complications for both mother and baby such as infection, bleeding and hysterectomy.

This rate is about 50 percent higher than it was in the mid-1990s, according to the U.S. Centers for Disease Control and Prevention.

"As clinicians, we are faced with so many issues when taking care of patients with higher BMI (body mass index), and one of them is a greater risk for cesarean," researcher Dr. Michelle Kominiarek of Indiana University told Reuters Health.

She added while previous studies had already linked cesarean delivery and body mass index (BMI) -- a measure of weight that takes into account height -- none had been large or detailed enough to determine how other factors might alter that risk, such as prior births or cesarean sections.

So Kominiarek and her colleagues collected data on nearly 125,000 women from the National Institutes of Health's Consortium on Safe Labor who gave birth between 2002 and 2008.

They analyzed the circumstances surrounding each birth, as well as the delivery route.

A total of 14 percent of the women underwent cesareans, report the researchers in the American Journal of Obstetrics and Gynecology (link.reuters.com/fyc74n). They found that for every unit increase in BMI, as measured on arrival for delivery, a woman's risk of cesarean delivery rose by 4 percent.

The team also discovered that this risk varied depending on whether or not a woman had given birth before or had previously undergone a cesarean section.   Continued...