Figure 1.

Kaplan-Meier curve representing recurrent thrombotic events in patients already treated for one thrombotic event. Thirty-five patients were followed for a median of 2.2 years. Median time to recurrence was approximately 4.5 years, and 14 patients eventually had recurrences. To our knowledge, all of these patients were supposed to have been on anticoagulation after their initial thrombosis, with the exception of one patient who was briefly instructed to stop warfarin for a procedure shortly before a recurrent thrombosis.