The clinical outcomes of unplanned pregnancy in severely obese women

OBJECTIVE: The objective of this study was to compare the clinical outcomes of unplanned pregnancies among severely obese women with those of planned pregnancies. METHODS: This prospective cohort study included severely obese women (Body Mass Index [BMI] ≥ 40.0 kg/m(2)) who delivered a baby weighing ≥ 500 g over 5 years 2009-2013 in a large university hospital. Maternal weight and height were measured and BMI was calculated at the first prenatal visit. RESULTS: Of the 650 women, the mean BMI was 43.8 kg/m(2), mean age was 31.6 years, and 30.0% (n = 195) were nulliparous. Prenatal complications including gestational diabetes mellitus (GDM), hypertensive and thromboembolic disorders occurred in 56.6% (n = 368). Compared with planned pregnancies (58.2%, n = 378), those that were unplanned (41.8%, n = 272) were associated with increased prepregnancy risk factors including essential hypertension (4.0% versus 1.6%, p = 0.03) and depression (6.6% versus 3.2%, p = 0.03). Unplanned pregnancy was associated with a higher macrosomia rate (birthweight > 4.5 kg) compared with planned pregnancies (p = 0.03). This was not explained by a higher GDM rate in unplanned pregnancies. Compared with planned pregnancies, unplanned pregnancies were not associated with increased adverse fetomaternal outcomes. CONCLUSION: Despite increased prepregnancy risk factors, in severely obese women, unplanned pregnancies were not associated with increased prenatal complications or adverse pregnancy outcomes compared with planned pregnancies.