Risk of first venous thromboembolism in pregnant women in hospital: population based cohort study from England

Sultan, Alyshah A., West, Joe, Tata, Laila J., Fleming, Kate M., Nelson-Piercy, Catherine and Grainge, Matthew J. (2013) Risk of first venous thromboembolism in pregnant women in hospital: population based cohort study from England. BMJ: British Medical Journal, 347 (7935). 11/1-11/11. ISSN 0959-8138

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Objective: To examine the potential for preventing venous

thromboembolism during and after antepartum hospital admissions in pregnant women.

Design: Cohort study using linked primary (Clinical Practice Research Datalink) and secondary (Hospital Episode statistics) care records.

Setting: Primary and secondary care centres, England.

Participants: 206 785 women aged 15-44 who had one or more

pregnancies from 1997 up to 2010.

Main outcome measure: Risk of first venous thromboembolism in pregnant women admitted to hospital for one or more days for reasons other than delivery or venous thromboembolism.

Risk was assessed by calculating the absolute rate of venous thromboembolism and comparing these rates with those observed during follow-up time not associated with hospital admission using a Poisson regression model to estimate incidence rate ratios.

Results: Admission to hospital in pregnancy was associated with an increased risk of venous thromboembolism(absolute rate 1752/100000 person years; incidence rate ratio 17.5, 95% confidence interval 7.69 to 40.0) compared with time outside hospital. The rate of venous thromboembolism was also high during the 28 days after discharge(absolute rate 676; 6.27, 3.74 to 10.5). The rate during and after admission combined was highest in the third trimester (961; 5.57, 3.32 to 9.34) and in those aged ≥35 years (1756; 21.7, 9.62 to 49.0). While the absolute rate in the combined period was highest for those with three or more days in hospital (1511; 12.2, 6.65 to 22.7), there was also a fourfold increase (558; 4.05, 2.23 to 7.38) in the risk of venous thromboembolism for those admitted to hospital for less than three days.

Conclusion: The overall risk of first venous thromboembolism in pregnant women increased during admissions to hospital not related to delivery,and remained significantly higher in the 28 days after discharge. During these periods need for thromboprophylaxis should receive careful consideration.

Item Type: Article
RIS ID: https://nottingham-repository.worktribe.com/output/719686
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/10.1136/bmj.f6099
Depositing User: Johnson, Mrs Alison
Date Deposited: 31 Mar 2014 13:15
Last Modified: 04 May 2020 16:40
URI: https://eprints.nottingham.ac.uk/id/eprint/2558

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