Abstract
To assess the relation between maternal body mass index (BMI) and pregnancy-related venous thromboembolism (VTE). Cohort study. A total of 2449133 women with singleton pregnancies who underwent delivery hospitalisation in California between 2008 and 2012. Association of pre-pregnancy BMI and the risk of an antepartum and postpartum VTE was examined using logistic regression, with normal BMI as reference. Antepartum and postpartum VTE-related hospitalisation. The prevalence of antepartum and postpartum VTE increased with increasing BMI (antepartum: 2.3, 3.0, 3.8, 4.2, 4.7, and 10.6 per 10000 women for underweight, normal BMI, overweight, obesity class I, II, and III, respectively, P<0.001; postpartum: 2.0, 3.1, 3.9, 5.6, 9.0, and 13.2 per 10000 women, P<0.01). The adjusted odds of antepartum and postpartum VTE increased progressively with increasing BMI, with obesity class III women having the highest risk of pregnancy-related VTE compared with normal BMI women: adjusted odds ratio for antepartum VTE: 2.9; 95% CI 2.2-3.8 and adjusted odds ratio for postpartum VTE: 3.6; 95% CI 2.9-4.6. Our findings clearly demonstrate an increasing risk of pregnancy-related VTE with increasing BMI. Obesity was associated with increased odds of antepartum and postpartum venous thromboembolism.
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