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Mechanical (MP) and bioprosthetic (BP) aortic valves are implanted commonly. Patients who receive durable MP valves require lifelong anticoagulation, whereas those who receive BP valves do not require long-term anticoagulation but face possible reoperation to replace deteriorated valves. Considering these trade-offs, valve choice is least clear for otherwise healthy middle-aged patients. In this Italian study, 310 patients (age range, 55–70) were randomized to receive MP or BP valves.
After mean follow-up of 106 months, survival was similar in the two groups, as were rates of thromboembolism, endocarditis, and other major prosthesis-related adverse events. However, the BP group exhibited a significantly higher rate of valve failure and need …