However, the management of anticoagulants needs to follow the mechanical valve. Lifelong anticoagulation.
As for why two kinds of valves should be used, we should start with the doctor's preoperative conversation. Elderly patients over 65 years old should consider using biological valves, but aortic valves are usually replaced mechanically. Under 65 years old, mechanical valve should be considered according to the condition.
The main reason is that the life of biological valves is short, generally about 15 years, while mechanical valves can be used for decades. The advantage of biological valve is that anticoagulation demand is low, and anticoagulation is hardly needed for half a year after operation.