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Total of 27% had emergency cesareans: high BMI associated with slower labor progression from 4 to 10 cm dilation.(Obstetrics)
SALT LAKE CITY -- Overweight and obese women demonstrated a slower progression of labor from 4 to 10 cm dilation, compared with normal-weight women, Anjel Vahratian, Ph.D., said at the annual meeting of the Society for Pediatric and Perinatal Epidemiologic Research.
This finding supports those of previous studies that have found an increased risk of emergency cesarean deliveries among obese and over-weight women.
Dr. Vahratian and her associates at the University of North Carolina at Chapel Hill conducted a study of 612 nulliparous women recruited during their second trimester from prenatal care clinics.
The women were at least 16 years old and had singleton pregnancies. A total of 200 study participants were defined as obese (BMI greater than 29 kg/[m.sup.2]), 115 were overweight (BMI 26.1-29 kg/[m.sup.2]), and 297 were of normal weight (BMI 19.8-26 kg/[m.sup.2]).
For each woman, the researchers identified the median duration of labor based on each centimeter of cervical dilation to measure labor progression. Overweight and obese women had a significantly longer duration of labor between 4 and 10 cm dilation, compared with normal-weight women.
Prolonged labor was concentrated around 5-7 cm among obese women and 4-8 cm among overweight women.
Obese women appeared to have a slightly faster late active stage of labor, compared with overweight and normal weight women, but the differences between groups were not clinically significant.
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