Impact of risk factors on the timing of first postpartum venous thromboembolism: a population-based cohort study from England

Abdul Sultan, Alyshah and Grainge, Matthew J. and West, Joe and Fleming, Kate M. and Nelson-Piercy, Catherine and Tata, Laila J. (2014) Impact of risk factors on the timing of first postpartum venous thromboembolism: a population-based cohort study from England. Blood, 124 (18). pp. 2872-2880. ISSN 1528-0020

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Abstract

For women with preeclampsia, BMI >30 kg/m2, infection, or those having cesarean delivery, VTE risk remained elevated for 6 weeks postpartum.For women with postpartum hemorrhage or preterm birth, the relative rate of VTE was only increased for the first 3 weeks postpartum.Impact on the timing of first postpartum venous thromboembolism (VTE) for women with specific risk factors is of crucial importance when planning the duration of thromboprophylaxis regimen. We observed this using a large linked primary and secondary care database containing 222 334 pregnancies resulting in live and stillbirth births between 1997 and 2010. We assessed the impact of risk factors on the timing of postpartum VTE in term of absolute rates (ARs) and incidence rate ratios (IRRs) using a Poisson regression model. Women with preeclampsia/eclampsia and postpartum acute systemic infection had the highest risk of VTE during the first 3 weeks postpartum (ARs ≥2263/100 000 person-years; IRR ≥2.5) and at 4-6 weeks postpartum (AR ≥1360; IRR ≥3.5). Women with body mass index (BMI) >30 kg/m2 or those having cesarean delivery also had elevated rates up to 6 weeks (AR ≥1425 at 1-3 weeks and ≥722 at 4-6 weeks). Women with postpartum hemorrhage or preterm birth, had significantly increased VTE rates only in the first 3 weeks (AR ≥1736; IRR ≥2). Our findings suggest that the duration of the increased VTE risk after childbirth varies based on the type of risk factors and can extend up to the first 3 to 6 weeks postpartum.

Item Type: Article
Additional Information: This research was originally published in Blood. Alyshah Abdul Sultan, Matthew J. Grainge, Joe West, Kate M. Impact of risk factors on the timing of first postpartum venous thromboembolism: a population-based cohort study from England. Blood. 2014 ; Vol 124:10: pp.2872-2880. © the American Society of Hematology.
Schools/Departments: University of Nottingham, UK > Faculty of Medicine and Health Sciences > School of Medicine > Division of Epidemiology and Public Health
Identification Number: https://doi.org/10.1182/blood-2014-05-572834
Depositing User: Claringburn, Tara
Date Deposited: 16 Nov 2016 14:20
Last Modified: 16 Nov 2016 17:15
URI: http://eprints.nottingham.ac.uk/id/eprint/38750

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