alexa Increasing levels of free thyroxine as a risk factor for a first venous thrombosis: a case-control study.
Medicine

Medicine

Internal Medicine: Open Access

Author(s): van Zaane B, Squizzato A, Huijgen R, van Zanten AP, Fliers E,

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Abstract A hypercoagulable state exists in hyperthyroidism, but the association with venous thrombosis (VT) is not fully explored. We aimed to investigate VT risk for different plasma levels of thyroid hormones and thyroid antibodies. We used a case-control study on leg vein thrombosis conducted between September 1999 and August 2006 at the Academic Medical Center, Amsterdam, The Netherlands. Parameters of thyroid function were assessed in 190 cases (mean age, 57 years; range, 19-90 years) and 379 sex-matched controls (mean age, 56 years; range, 18-93 years). Odds ratios (ORs) and 95\% confidence intervals (CIs) for VT risk were estimated according to several cutoff levels derived from plasma levels observed in controls. We found the risk of VT to gradually rise with increasing levels of free thyroxine (FT(4)). In the absence of traditional acquired risk factors, FT(4) levels above 17 pmol/L yielded a sex- and age-adjusted OR of 2.2 (95\% CI, 1.2-4.2) for deep VT, which further increased up to an OR of 13.0 (95\% CI, 1.1-154.1) for FT(4) levels above reference range. Our data suggest increasing levels of FT(4) to be a risk factor for VT and may have implications for both the prevention and management of this disease.
This article was published in Blood and referenced in Internal Medicine: Open Access

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