Posttreatment ultrasound-detected residual venous thrombosis: a risk factor for recurrent venous thromboembolism and mortality.

Purpose Of Review: The cumulative risk of recurrent venous thrombosis may rise to 30% over 8 years. Extended oral anticoagulation is effective but major bleeding is increased. To balance these risks attention has focused on identifying patients with the highest likelihood of recurrence for whom continued therapy is most beneficial.