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Hyperglycemia, assessed according to HbA1c , and future risk of venous thromboembolism: the Tromsø study.

Recieved:01-Jan-2014 00:00:00

Department of Clinical Medicine, Hematologic Research Group (HERG), University of Tromsø, Tromsø, Norway.
Lerstad, G; Brodin, EE; Enga, KF; Jorde, R; Schirmer, H; Njølstad, I; Svartberg, J; Braekkan, SK; Hansen, JB

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HbA1c , a marker of average plasma glucose level during the previous 8-12 weeks, is associated with the future risk of cardiovascular disease and all-cause mortality. To examine the association between hyperglycemia, assessed according to HbA1c , and the future risk of venous thromboembolism (VTE) in a population-based cohort. HbA1c was measured in 16 156 unique subjects (25-87 years) who participated in one or more surveys of the Tromsø study (Tromsø 4, 1994-1995; Tromsø 5, 2001-2002; and Tromsø 6, 2007-2008). All subjects were followed, and incident VTE events were recorded up to 31 December 2010. There were 333 validated first VTE events, of which 137 were unprovoked, during a median follow-up of 7.1 years. HbA1c was not associated with the future risk of VTE in analyses treating HbA1c as a continuous variable, or in categorized analyses. The risk of VTE increased by 5% per one standard deviation (0.7%) increase in HbA1c (multivariable-adjusted hazard ratio [HR] 1.05; 95% confidence interval [CI] 0.97-1.14), and subjects with HbA1c  ≥ 6.5% had a 27% higher risk than those with HbA1c