Abstract
Objective This study aimed to examine the association between interpregnancy body mass index
(BMI, kg/m2) change and intrapartum cesarean delivery in multiparous women without a history
of cesarean delivery.
Study Design We conducted a retrospective cohort study of all women who had more than one singleton
pregnancy at 23 weeks' gestation or greater at MedStar Washington Hospital Center
from January 2009 to June 2018. We excluded women who had a history of cesarean delivery,
prelabor cesarean delivery, and contraindications for vaginal delivery. Interpregnancy
BMI change was calculated by the change of early pregnancy BMI measured in the office.
Women were categorized according to the interpregnancy BMI change (BMI loss more than
2 kg/m2, BMI change ± 2 kg/m2, and BMI gain more than 2 kg/m2). The primary outcome was an intrapartum cesarean delivery. Multivariable logistic
regression was performed to calculate adjusted odds ratio (aOR) with 95% confidence
interval (CI) after adjusting for predefined covariates.
Results Of 2,168 women who were analyzed, 258 (12%), 1,192 (55%), and 718 (33%) had interpregnancy
BMI loss more than 2 kg/m2, BMI change ± 2 kg/m2, and BMI gain more than 2 kg/m2, respectively. Women with BMI gain more than 2 kg/m2 compared with those with BMI change ± 2 kg/m2 had increased odds of intrapartum cesarean delivery (7.4 vs. 4.5%; aOR: 1.78; 95%
CI: 1.10–2.86) and cesarean delivery for arrest disorders (3.1 vs. 1.1%; aOR: 3.06;
95% CI: 1.30–7.15). Women with BMI loss more than 2 kg/m2 compared with those with BMI change ± 2 kg/m2 had similar rates of cesarean delivery.
Conclusion Compared with interpregnancy BMI change ± 2 kg/m2, interpregnancy BMI gain 2 kg/m2 was associated with increased odds of intrapartum cesarean delivery.
Key Points
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BMI gain between pregnancies was associated with intrapartum cesarean delivery.
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BMI loss between pregnancies was not associated with intrapartum cesarean delivery.
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Our study suggests that at least maintaining weight between pregnancies is beneficial.
Keywords
arrest - obesity - weight gain
