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50.3 Predisposing factors for first and recurrent venous thrombosis
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Published:July 2018
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Abstract
Venous thrombosis, which mainly manifests as deep vein thrombosis of the leg or pulmonary embolism, is a major contributor to global disease burden. With a recurrence rate of approximately 25% in 5 years, and a 30-day case fatality rate of 5–10%, identification of predisposing factors for venous thrombosis is imperative. Dozens of risk factors for first venous thrombosis are known today, which can be grouped into three categories: first venous thrombosis ‘provoked by a transient risk factor’, ‘provoked by a persistent risk factor’, or ‘unprovoked’. This chapter comments on how risk factors known today can be classified into these categories, how this classification determines recurrence risk, and how knowledge on predisposing risk factors should be interpreted and integrated for optimal clinical use. The chapter proposes that predisposing factors for venous thrombosis are not the same for each high-risk situation. This is important to consider when one wants to identify high-risk groups in, for example, cancer patients, surgical patients, in patients with a medical illness, or in patients at risk for recurrent venous thrombosis. This way it will be possible to expose only those patients at unacceptably high risk of thrombosis to the risks and burden of anticoagulant treatment. In conclusion, the knowledge on predisposing factors for venous thrombosis is extensive, but the patient will benefit most when this knowledge is properly integrated, depending on the clinical situation.
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