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PHILADELPHIA -- Nulliparous women with a prepregnancy body mass index in the overweight, obese, and morbidly obese categories are at an increased risk for failed labor induction and subsequent cesarean delivery, Dr. Thomas Myles said at the annual meeting of the American College of Obstetricians and Gynecologists.
"The heavier that a woman is [before] pregnancy, the greater the likelihood she will have a failed induction and subsequent cesarean section," said Dr. Myles of the department of ob.gyn., St. Louis University.
A new retrospective study of 14,703 singleton births has shown that overweight women, obese, and morbidly obese women were 1.3, 2.0, and 2.8 times, respectively, as likely than were women with normal body mass index (BMI) to have failed induction and a cesarean section, he said.
Dr. Myles also emphasized the study's other finding: High or "inappropriate" weight gain during pregnancy among women in the overweight, obese, and morbidly obese BMI categories did not significantly increase the likelihood of a failed induction and cesarean section.
However, women with a normal BMI and a high pregnancy weight gain did have a significant increase in the risk of failed induction and cesarean section.
The normal BMI, high weight gain, and cesarean section risk "is an important patient management issue," he said.
Labor induction is one of the fastest growing medical procedures in the United States. and the procedure increases the risk of cesarean section, Dr. Myles said.
Source: HighBeam Research, Nulliparous women: high prepregnancy BMI linked to failed induction;...