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We describe characteristics and risk factors regarding pregnancy outcome in women with a preconception body mass index (BMI) >50 kg/m² compared with women with BMI ≤50 kg/m² in a retrospective population cohort study in singleton pregnancies from the Danish Medical Birth Registry. Results were analyzed as relative risks by a two-proportion z-test. Women with preconception BMI >50 kg/m² smoked, developed gestational diabetes and pre-eclampsia, and needed induction of labor more frequently than mothers with BMI ≤50 kg/m². Examination of the case records showed that many attempted vaginal delivery without epidural analgesia, 21% needed an emergency cesarean section (compared with 12% among women with BMI ≤50 kg/m²), and 25% underwent general anesthesia in this context. Many neonates were macrosomic and 34% needed neonatal intensive care and early feeding compared with 6% of neonates from women with BMI ≤50 kg/m². Women with an extremely high preconception BMI develop more pregnancy complications and their neonates appear affected by this as well.

Introduction Very few studies describe the obstetric and neonatal outcome of spontaneous pregnancies in women with irregular menstrual cycles. However, menstrual cycle irregularities are common and may be associated with increased risk, and women who develop pregnancy complications more frequently recollect irregular menstrual cycles before the time of conception in case-control studies. Material and methods This retrospective cohort study compares obstetric and neonatal outcomes in spontaneous singleton pregnancies in 3440 primiparous Danish women stratified according to menstrual cycle regularity. All pregnancies delivered after 22 weeks of gestation and had a nuchal translucency examination at Copenhagen University Hospital Hvidovre between 1 January 2009 and 31 December 2010. Menstrual cycle irregularity was defined as more than 7 days' deviation between self-reported and ultrasound examination-based gestational age. Outcome measures were gestational diabetes, hypertension, preeclampsia, preterm premature rupture of membranes, preterm birth, prolonged pregnancy, birthweight, umbilical artery pH

We describe characteristics and risk factors regarding pregnancy outcome in women with a preconception body mass index (BMI)50 kg/m² compared with women with BMI ≤50 kg/m² in a retrospective population cohort study in singleton pregnancies from the Danish Medical Birth Registry. Results were analyzed as relative risks by a two-proportion z-test. Women with preconception BMI50 kg/m² smoked, developed gestational diabetes and pre-eclampsia, and needed induction of labor more frequently than mothers with BMI ≤50 kg/m². Examination of the case records showed that many attempted vaginal delivery without epidural analgesia, 21% needed an emergency cesarean section (compared with 12% among women with BMI ≤50 kg/m²), and 25% underwent general anesthesia in this context. Many neonates were macrosomic and 34% needed neonatal intensive care and early feeding compared with 6% of neonates from women with BMI ≤50 kg/m². Women with an extremely high preconception BMI develop more pregnancy complications and their neonates appear affected by this as well.