Abstract
Background: Factor V Leiden (FVL) is an inherited autosomal dominant condition that is identified in 20%-50% of patients with venous thromboembolic diseases and 5-8% of the population in Canada. People with FVL are often called hypercoagulable and have a five-fold increase in the risk of venous thrombosis. There is a low prevalence of FVL among patients with fatal pulmonary embolism (PE) and a higher incidence of deep vein thrombosis (DVT) than PE in patients with FVL. This has been referred to as the FVL paradox in thrombosis. We wished to test whether FVL and normal patients are at the same risk of initial thrombus formation, expect FVL patients present with symptomatic DVT while normal patients do not present, because the small asymptomatic DVT in normal patients embolizes to become an asymptomatic PE.
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