Format

Send to

Choose Destination
Br J Haematol. 2012 Feb;156(3):366-73. doi: 10.1111/j.1365-2141.2011.08956.x. Epub 2011 Dec 7.

Risk of first venous thromboembolism in and around pregnancy: a population-based cohort study.

Author information

1
Division of Epidemiology and Public Health, University of Nottingham, City Hospital Nottingham, UK.

Abstract

Knowledge of the absolute and relative risk of venous thromboembolism (VTE) in and around pregnancy would be crucial in identifying when to commence and cease thromboprophylaxis in women who would benefit from such intervention. We addressed this hypothesis using a large prospective primary care database from the United Kingdom, containing details on 972683 women aged 15-44years between 1987 and 2004. Risks of a first VTE during antepartum, postpartum and outside of pregnancy were compared using Poisson regression. The rate of VTE during the third trimester antepartum was six times higher than time outside pregnancy [Incidence Rate Ratio (IRR)=6·1; 95% confidence interval, 4·7-7·9]. In contrast, both the first (IRR=1·6) and second (IRR=2·1) trimesters conferred little increase in risk. The first 6weeks postpartum was associated with a 22-fold increase in risk, with the peak occurring in the first 3weeks. Increased age was found to be associated with VTE during postpartum and outside of pregnancy, but not during antepartum. Our findings of a notably raised risk of VTE persisting for 3 weeks postpartum and of a raised antepartum risk constrained to the third trimester have implications for modifying the current recommendations for VTE prophylaxis in pregnancy and the puerperium.

[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Wiley
Loading ...
Support Center