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Predictors of Cesarean Delivery ID'd Among Extremely Obese

BMI is independent predictor of cesarean delivery; also maternal age, parity, dilation at admission

Predictors of Cesarean Delivery ID'd Among Extremely Obese

FRIDAY, Dec. 6, 2013 (HealthDay News) -- For extremely obese women, predictors of cesarean delivery (CD) include body mass index (BMI), as well as maternal age, parity, and cervical dilation at the time of admission, according to a study published in the December issue of the American Journal of Obstetrics & Gynecology.

To investigate predictors of CD, Ravindu P. Gunatilake, M.D., from the Duke University Medical Center in Durham, N.C., and colleagues identified all pregnant women delivering at a single institution from Jan. 1, 2008, through July 31, 2010, weighing more than 275 lb at the time of delivery and undergoing a trial of labor (TOL) with a singleton gestation of more than 34 weeks.

Of the 357 pregnant women who weighed more than 275 lb (all with a BMI of >40 kg/m²), 69.5 percent attempted a TOL. The researchers found that, compared to those having a vaginal delivery, women who underwent CD had a significantly greater BMI (51.6 versus 49.9 kg/m²; P = 0.038), were less likely to be parous (32.2 versus 65.8 percent; P < 0.0001), and were more likely to be induced (80.5 versus 57.8 percent). Among nulliparous women, independent predictors of CD included maternal age, parity, and cervical dilation at time of admission, in multivariate analysis. The odds of CD were also increased 3.5-fold with an increase in BMI of 10 kg/m² (P = 0.002).

"Among nulliparous extremely obese women attempting a TOL, BMI was an independent predictor of CD, with the rate of CD increasing further with increasing BMI," the authors write. "The underlying mechanisms for failed TOL in the setting of maternal obesity remain largely unknown."

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