Between 1979 and 1985, 5 patients underwent pulmonary valve replacement with a St. Jude Medical valve. During follow-up ranging from 30 months to 18 years, there were 6 episodes of valve thrombosis in 4 patients. Three episodes were treated by thrombolysis. Reoperation was necessary in 3 patients. Although the St. Jude Medical valve in the pulmonary position can occasionally function long-term without anticoagulation, these cases show the high risk of thrombosis and need for anticoagulation.
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