Joint effect of myocardial infarction and obesity on the risk of venous thromboembolism: The Tromsø Study

Background: Myocardial infarction (MI) is associated with an increased risk of venous thromboembolism (VTE). Obesity is a recognized risk factor for both MI and VTE. Whether obesity further increases the risk of VTE in MI patients is scarcely investigated. Aim: To study the joint effect of MI and ob...

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Bibliographic Details
Published in:Journal of Thrombosis and Haemostasis
Main Authors: Sejrup, Joakim Knutsen, Tøndel, Birgitte Gladsø, Morelli, Vania Maris, Løchen, Maja-Lisa, Njølstad, Inger, Mathiesen, Ellisiv B., Wilsgaard, Tom, Hansen, John Bjarne, Brækkan, Sigrid Kufaas
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2022
Subjects:
Tromsø
Online Access:https://hdl.handle.net/10037/28377
https://doi.org/10.1111/jth.15812
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Summary:Background: Myocardial infarction (MI) is associated with an increased risk of venous thromboembolism (VTE). Obesity is a recognized risk factor for both MI and VTE. Whether obesity further increases the risk of VTE in MI patients is scarcely investigated. Aim: To study the joint effect of MI and obesity on the risk of VTE. Methods: Study participants (n = 29 410) were recruited from three surveys of the Tromsø Study (conducted in 1994–1995, 2001, and 2007–2008) and followed up through 2014. All incident MI and VTE cases during follow-up were recorded. Cox regression models with MI as a time-dependent variable were used to estimate hazard ratios (HRs) of VTE (adjusted for age and sex) by combinations of MI exposure and obesity status. Joint effects were assessed by calculating relative excess risk and attributable proportion (AP) due to interaction. Results: During a median of 19.6 years of follow-up, 2090 study participants experienced an MI and 784 experienced a VTE. Among those with MI, 55 developed a subsequent VTE, yielding an overall incidence rate (IR) of VTE of 5.3 per 1000 personyears (95% confidence interval [CI]: 4.1–6.9). In the combined exposure group (MI+/ Obesity+), the IR was 11.3 per 1000 person-years, and the adjusted HR indicated a 3-fold increased risk of VTE (HR 3.16, 95% CI: 1.99–4.99) compared to the reference group (MI−/Obesity−). The corresponding AP was 0.46 (95% CI: 0.17–0.74). Conclusions: The combination of MI and obesity yielded a supra-additive effect on VTE risk of which 46% of the VTE events were attributed to the interaction.

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