@article {1119, title = {Peak thrombin generation and subsequent venous thromboembolism: the Longitudinal Investigation of Thromboembolism Etiology (LITE) study.}, journal = {J Thromb Haemost}, volume = {7}, year = {2009}, month = {2009 Oct}, pages = {1639-48}, abstract = {

BACKGROUND: Thrombin is an enzyme that is essential for the acceleration of the coagulation cascade and the conversion of fibrinogen to clottable fibrin.

OBJECTIVES: We evaluated the relationship of basal peak thrombin generation with the risk of future venous thromboembolism (VTE), and determined whether associations were independent of other coagulation markers.

METHODS: The Longitudinal Investigation of Thromboembolism Etiology (LITE) study investigated VTE in two prospective population-based cohorts: the Atherosclerosis Risk in Communities (ARIC) study and the Cardiovascular Health Study (CHS). Peak thrombin generation was measured on stored plasma in a nested case-control sample (434 cases and 1004 controls). Logistic regression was used to estimate the relationship of peak thrombin generation with VTE, adjusted for age, sex, race, center, and body mass index. Mediation was evaluated by additionally adjusting for factor VIII and D-dimer.

RESULTS: Relative to the first quartile of peak thrombin generation, the odds ratio (OR) of VTE for those above the median was 1.74 [95\% confidence interval (CI) 1.28-2.37]. The association was modestly attenuated by adjustment for FVIII and D-dimer (OR 1.47, 95\% CI 1.05-2.05). Associations appeared to be stronger for idiopathic than for secondary VTE. Elevated peak thrombin generation more than added to the VTE risk associated with FV Leiden or low activated partial thromboplastin time.

CONCLUSIONS: In this prospective study of two independent cohorts, elevated basal peak thrombin generation was associated with subsequent risk of VTE, independently of established VTE risk factors.

}, keywords = {Adult, Aged, Biomarkers, Blood Coagulation Factors, Case-Control Studies, Ethnic Groups, Factor VIII, Female, Fibrin Fibrinogen Degradation Products, Humans, Male, Middle Aged, Partial Thromboplastin Time, Prospective Studies, Risk Factors, Thrombin, United States, Venous Thromboembolism}, issn = {1538-7836}, doi = {10.1111/j.1538-7836.2009.03561.x}, author = {Lutsey, P L and Folsom, A R and Heckbert, S R and Cushman, M} } @article {7359, title = {Taller height as a risk factor for venous thromboembolism: a Mendelian randomization meta-analysis.}, journal = {J Thromb Haemost}, year = {2017}, month = {2017 Apr 26}, abstract = {

BACKGROUND: Taller height is associated with greater risk of venous thromboembolism (VTE).

OBJECTIVES: We used instrumental variable (IV) techniques (Mendelian randomization) to further explore this relationship METHODS: Participants of European ancestry were included from two cohort studies [Atherosclerosis Risk in Communities (ARIC) study and Cardiovascular Health Study (CHS)] and one case-control study [Mayo Clinic VTE Study (Mayo)]. We created two weighted genetic risk scores (GRS) for height; the full GRS included 668 single nucleotide polymorphisms (SNPs) from a previously published meta-analysis and the restricted GRS included a subset of 362 SNPs not associated with weight independently of height. Standard logistic regression and IV models were used to estimate odds ratios (ORs) for VTE per 10 cm increment in height. ORs were pooled across the three studies using inverse variance weighted random effects meta-analysis RESULTS: Among 9143 ARIC and 3180 CHS participants free of VTE at baseline, there were 367 and 109 incident VTE events. There were 1143 VTE cases and 1292 controls included from Mayo. The pooled ORs from non-IV models and models using the full and restricted GRSs as IVs were 1.27 (95\% CI: 1.11, 1.46), 1.34 (95\% CI: 1.04, 1.73), and 1.45 (95\% CI: 1.04, 2.01) per 10 cm greater height, respectively CONCLUSIONS: Taller height is associated with an increased risk of VTE in adults of European ancestry. Possible explanations for this association, including that taller people may have greater venous surface area, greater number of venous valves, or greater hydrostatic pressure, need to be explored further. This article is protected by copyright. All rights reserved.

}, issn = {1538-7836}, doi = {10.1111/jth.13719}, author = {Roetker, N S and Armasu, S M and Pankow, J S and Lutsey, P L and Tang, W and Rosenberg, M A and Palmer, T M and MacLehose, R F and Heckbert, S R and Cushman, M and de Andrade, M and Folsom, A R} }