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Meta-Analysis
. 2017 Jan 3;135(1):7-16.
doi: 10.1161/CIRCULATIONAHA.116.024507. Epub 2016 Nov 9.

Association of Traditional Cardiovascular Risk Factors With Venous Thromboembolism: An Individual Participant Data Meta-Analysis of Prospective Studies

Affiliations
Meta-Analysis

Association of Traditional Cardiovascular Risk Factors With Venous Thromboembolism: An Individual Participant Data Meta-Analysis of Prospective Studies

Bakhtawar K Mahmoodi et al. Circulation. .

Erratum in

Abstract

Background: Much controversy surrounds the association of traditional cardiovascular disease risk factors with venous thromboembolism (VTE).

Methods: We performed an individual level random-effect meta-analysis including 9 prospective studies with measured baseline cardiovascular disease risk factors and validated VTE events. Definitions were harmonized across studies. Traditional cardiovascular disease risk factors were modeled categorically and continuously using restricted cubic splines. Estimates were obtained for overall VTE, provoked VTE (ie, VTE occurring in the presence of 1 or more established VTE risk factors), and unprovoked VTE, pulmonary embolism, and deep-vein thrombosis.

Results: The studies included 244 865 participants with 4910 VTE events occurring during a mean follow-up of 4.7 to 19.7 years per study. Age, sex, and body mass index-adjusted hazard ratios for overall VTE were 0.98 (95% confidence interval [CI]: 0.89-1.07) for hypertension, 0.97 (95% CI: 0.88-1.08) for hyperlipidemia, 1.01 (95% CI: 0.89-1.15) for diabetes mellitus, and 1.19 (95% CI: 1.08-1.32) for current smoking. After full adjustment, these estimates were numerically similar. When modeled continuously, an inverse association was observed for systolic blood pressure (hazard ratio=0.79 [95% CI: 0.68-0.92] at systolic blood pressure 160 vs 110 mm Hg) but not for diastolic blood pressure or lipid measures with VTE. An important finding from VTE subtype analyses was that cigarette smoking was associated with provoked but not unprovoked VTE. Fully adjusted hazard ratios for the associations of current smoking with provoked and unprovoked VTE were 1.36 (95% CI: 1.22-1.52) and 1.08 (95% CI: 0.90-1.29), respectively.

Conclusions: Except for the association between cigarette smoking and provoked VTE, which is potentially mediated through comorbid conditions such as cancer, the modifiable traditional cardiovascular disease risk factors are not associated with increased VTE risk. Higher systolic blood pressure showed an inverse association with VTE.

Keywords: cardiovascular disease; diabetes mellitus; hyperlipidemia; hypertension; risk factors; smoking; venous thromboembolism.

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Conflict of interest statement

Disclosures: None declared. All authors submitted the ICMJE form on Disclosure of Potential Conflicts of Interest. The views expressed in this manuscript are those of the authors and do not necessarily represent the views of the National Heart, Lung, and Blood Institute; the National Institutes of Health; or the U.S. Department of Health and Human Services.

Figures

Figure 1
Figure 1. Flow diagram for selection of studies
Figure 2
Figure 2. Pooled and study-specific hazard ratios of overall VTE
The top panel shows the pooled estimates from crude models (Model 1); age, sex and BMI adjusted models (Model 2); and fully adjusted models (Model 3). The fully adjusted model included age, sex, race, BMI (continuous), history of CVD, history of VTE, hypertension, hypercholesterolemia, diabetes, former and current smoking. The bottom panel shows study-specific hazard ratios of overall VTE for hypertension, hypercholesterolemia, diabetes, and current smoking adjusted for age, sex and BMI. VTE denotes venous thromboembolism; and Part., participants.
Figure 2
Figure 2. Pooled and study-specific hazard ratios of overall VTE
The top panel shows the pooled estimates from crude models (Model 1); age, sex and BMI adjusted models (Model 2); and fully adjusted models (Model 3). The fully adjusted model included age, sex, race, BMI (continuous), history of CVD, history of VTE, hypertension, hypercholesterolemia, diabetes, former and current smoking. The bottom panel shows study-specific hazard ratios of overall VTE for hypertension, hypercholesterolemia, diabetes, and current smoking adjusted for age, sex and BMI. VTE denotes venous thromboembolism; and Part., participants.
Figure 3
Figure 3. Pooled hazard ratios of overall VTE according to blood pressure measurements for systolic pressure (panel A), diastolic pressure (panel B), pulse pressure (Panel C) and mean arterial pressure (Panel D)
Estimates are adjusted for age, sex, BMI (continuous), history of cardiovascular disease and antihypertensive medication use. The black line and the error-bars depict hazard rations and 95% confidence interval with the red dots indicating statistical significance (P<0.05) and the black diamond the reference value. The heights of the bars shown with the gray lines at the bottom of each graph depict the number of participants at each spline section and the widths of these bars correspond to the splines range.
Figure 4
Figure 4. Pooled hazard ratios of overall VTE according to lipid measurements for total cholesterol (panel A), low-density lipoproteins (panel B), high-density lipoproteins (Panel C) and triglycerides (Panel D) levels
Estimates are adjusted for age, sex, BMI (continuous), history of cardiovascular disease and lipid-lowering medication use. The black line and the error-bars depict hazard rations and 95% confidence interval with the red dots indicating statistical significance (P<0.05) and the black diamond the reference value. The heights of the bars shown with the gray lines at the bottom of each graph depict the number of participants at each spline section and the widths of these bars correspond to the splines range.

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